:root {
    --navy: #11152d;
    --navy-soft: #1a1f3d;
    --ink: #1d2540;
    --muted: #737b91;
    --faint: #a5aabc;
    --purple: #6656e8;
    --purple-dark: #4f42c8;
    --purple-soft: #eeebff;
    --cyan: #46cbd5;
    --cyan-soft: #e7f9f9;
    --green: #39b980;
    --orange: #f5a34a;
    --red: #e66572;
    --paper: #fff;
    --canvas: #f5f6fa;
    --line: #e9eaf1;
    --shadow: 0 16px 42px rgba(24, 29, 61, .075);
    --radius: 18px;

    /* 语义化文本/背景变量（学生端历史会话列表等） */
    --text-primary: #1d2540;
    --text-secondary: #6b7280;
    --text-tertiary: #7b818d;
    --text-quaternary: #9aa0ad;
    --bg-hover: #f0f1f4;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    color: var(--ink);
    background: var(--canvas);
    font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; }
button { border: 0; cursor: pointer; color: inherit; }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, a:focus-visible { outline: 3px solid rgba(102, 86, 232, .24); outline-offset: 2px; }

.app-shell { min-height: 100vh; }
.sidebar {
    position: fixed;
    z-index: 30;
    inset: 0 auto 0 0;
    width: 244px;
    display: flex;
    flex-direction: column;
    padding: 24px 16px 16px;
    color: #eef0ff;
    background:
        radial-gradient(circle at 20% 12%, rgba(112, 92, 244, .20), transparent 24%),
        linear-gradient(180deg, #151934 0%, #0f132a 100%);
    box-shadow: 8px 0 30px rgba(10, 12, 30, .12);
}
.brand { display: flex; align-items: center; gap: 11px; padding: 2px 8px 25px; color: #fff; text-decoration: none; }
.brand > span:last-child { display: flex; flex-direction: column; }
.brand strong { font-size: 17px; letter-spacing: .06em; }
.brand-mark { position: relative; width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; background: linear-gradient(145deg, #7565f2, #5043c9); box-shadow: 0 8px 20px rgba(91, 73, 220, .35); }
.brand-mark i { position: absolute; border: 1px solid rgba(255,255,255,.72); border-radius: 50%; transform: rotate(-25deg); }
.brand-mark i:nth-child(1) { width: 25px; height: 11px; }
.brand-mark i:nth-child(2) { width: 11px; height: 25px; }
.brand-mark i:nth-child(3) { width: 5px; height: 5px; border: 0; background: #fff; }
.main-nav { flex: 1; }
.nav-label { margin: 0 11px 9px; color: #656d90; font-size: 10px; font-weight: 700; letter-spacing: .13em; }
.nav-label-spaced { margin-top: 26px; }
.nav-item { position: relative; width: 100%; height: 44px; margin: 3px 0; padding: 0 12px; display: flex; align-items: center; gap: 11px; border-radius: 11px; color: #aab0cb; background: transparent; text-align: left; font-size: 13px; transition: .2s ease; }
.nav-item:hover { color: #fff; background: rgba(255,255,255,.055); }
.nav-item.active { color: #fff; background: linear-gradient(100deg, rgba(108,89,235,.95), rgba(99,81,219,.78)); box-shadow: 0 8px 22px rgba(75, 59, 184, .23); }
.nav-icon { width: 22px; text-align: center; color: #c1c5da; font-size: 17px; font-weight: 700; }
.nav-item.active .nav-icon { color: #fff; }
.nav-dot { width: 6px; height: 6px; margin-left: auto; border-radius: 50%; background: #5cdbca; box-shadow: 0 0 0 3px rgba(92,219,202,.1); }
.nav-count { min-width: 19px; height: 19px; margin-left: auto; padding: 0 5px; display: grid; place-items: center; border-radius: 10px; color: #fff; background: var(--orange); font-size: 9px; font-style: normal; font-weight: 800; }
.daily-goal { margin: 0 2px 12px; padding: 12px; display: flex; align-items: center; gap: 10px; border: 1px solid rgba(255,255,255,.07); border-radius: 13px; background: rgba(255,255,255,.035); }
.goal-ring { --progress: 60%; width: 43px; height: 43px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 50%; background: conic-gradient(#6bd8cf var(--progress), rgba(255,255,255,.1) 0); position: relative; }
.goal-ring::after { content: ""; position: absolute; inset: 4px; border-radius: inherit; background: #181c36; }
.goal-ring span { position: relative; z-index: 1; color: #fff; font-size: 9px; font-weight: 700; }
.daily-goal > div:last-child, .student-card > span:nth-child(2) { display: flex; min-width: 0; flex-direction: column; }
.daily-goal strong, .student-card strong { font-size: 11px; }
.daily-goal small, .student-card small { margin-top: 4px; color: #747c9e; font-size: 9px; white-space: nowrap; }
.student-card { width: 100%; padding: 10px; display: flex; align-items: center; gap: 10px; border-radius: 12px; color: #fff; background: rgba(255,255,255,.035); text-align: left; }
.student-card:hover { background: rgba(255,255,255,.07); }
.avatar { display: grid; place-items: center; border-radius: 50%; color: #fff; background: linear-gradient(145deg, #65d5d1, #6656e8); font-weight: 800; }
.avatar-small { width: 34px; height: 34px; flex: 0 0 auto; font-size: 10px; }
.student-card .more { margin-left: auto; color: #6e7595; }

.main-shell { min-height: 100vh; margin-left: 244px; }
.topbar { position: sticky; z-index: 20; top: 0; height: 68px; padding: 0 31px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid rgba(231,232,239,.9); background: rgba(255,255,255,.88); backdrop-filter: blur(18px); }
.menu-button { display: none; width: 38px; height: 38px; border-radius: 10px; background: #f0eff9; }
.crumb { color: var(--muted); font-size: 12px; }
.crumb b { margin: 0 9px; color: #c8cad3; }.crumb strong { color: var(--ink); }
.top-actions { display: flex; align-items: center; gap: 10px; }
.grade-switch { height: 36px; padding: 0 8px 0 11px; display: flex; align-items: center; gap: 7px; border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--muted); font-size: 11px; }
.grade-switch select { max-width: 118px; border: 0; outline: 0; color: var(--ink); background: transparent; font-weight: 650; }
.streak { height: 36px; padding: 0 10px; display: flex; align-items: center; gap: 3px; border-radius: 10px; color: #9a6728; background: #fff5e9; }
.streak span { font-size: 16px; }.streak strong { font-size: 13px; }.streak small { font-size: 9px; }
.icon-button { width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.icon-button:hover { color: var(--purple); background: var(--purple-soft); }

.content { width: min(1280px, calc(100% - 56px)); margin: 0 auto; padding: 27px 0 48px; }
.view { display: none; animation: view-in .35s ease; }
.view.active { display: block; }
@keyframes view-in { from { opacity: 0; transform: translateY(6px); } }
.panel { border: 1px solid rgba(229,230,238,.85); border-radius: var(--radius); background: var(--paper); box-shadow: var(--shadow); }
.overline { color: var(--purple); font-size: 9px; font-weight: 800; letter-spacing: .18em; }
h1, h2, h3, p { margin-top: 0; }

.welcome-grid { display: grid; grid-template-columns: 1.58fr .82fr; gap: 17px; }
.welcome-card { position: relative; min-height: 244px; padding: 34px 36px; display: flex; overflow: hidden; border-radius: 21px; color: #fff; background: linear-gradient(118deg, #5f52de 0%, #6656e8 54%, #5d5ad8 100%); box-shadow: 0 18px 38px rgba(82,67,198,.21); }
.welcome-card::before { content: ""; position: absolute; width: 360px; height: 360px; right: -120px; top: -155px; border: 1px solid rgba(255,255,255,.08); border-radius: 50%; box-shadow: 0 0 0 65px rgba(255,255,255,.025), 0 0 0 130px rgba(255,255,255,.018); }
.welcome-copy { position: relative; z-index: 2; max-width: 63%; }
.date-tag { display: inline-block; margin-bottom: 15px; color: #d7d3ff; font-size: 9px; font-weight: 800; letter-spacing: .14em; }
.welcome-copy h1 { margin-bottom: 10px; font-size: clamp(25px, 3vw, 35px); letter-spacing: -.035em; }
.wave { display: inline-block; font-size: .8em; animation: wave 2.4s ease-in-out infinite; transform-origin: 70% 70%; }
@keyframes wave { 0%,60%,100% { transform: rotate(0) } 68% { transform: rotate(18deg) } 76% { transform: rotate(-8deg) } 84% { transform: rotate(13deg) } }
.welcome-copy p { margin-bottom: 24px; color: #dcd9fa; font-size: 13px; line-height: 1.7; }
.welcome-actions { display: flex; align-items: center; gap: 18px; }
.primary-button { min-height: 41px; padding: 0 18px; display: inline-flex; align-items: center; justify-content: center; gap: 18px; border-radius: 10px; color: #fff; background: var(--purple); box-shadow: 0 8px 18px rgba(83,68,201,.2); font-size: 12px; font-weight: 700; transition: .2s; }
.primary-button:hover { transform: translateY(-2px); background: var(--purple-dark); box-shadow: 0 11px 24px rgba(83,68,201,.25); }
.welcome-card .primary-button { color: var(--purple); background: #fff; box-shadow: 0 9px 21px rgba(35,26,102,.18); }
.text-button { padding: 7px 0; color: var(--purple); background: transparent; font-size: 11px; font-weight: 700; }
.welcome-card .text-button { color: #e9e6ff; }
.planet-scene { position: absolute; z-index: 1; width: 260px; height: 230px; right: 0; bottom: 0; }
.planet { position: absolute; width: 106px; height: 106px; right: 60px; top: 60px; display: grid; place-items: center; border-radius: 50%; background: linear-gradient(145deg, #75e0db, #53c0d4); box-shadow: inset -18px -12px 25px rgba(34,97,157,.18), 0 18px 28px rgba(31,36,99,.25); }
.planet::before, .planet::after { content: ""; position: absolute; border-radius: 50%; background: rgba(49,125,160,.18); }.planet::before { width: 20px; height: 12px; left: 22px; top: 25px; transform: rotate(-20deg); }.planet::after { width: 13px; height: 18px; right: 18px; bottom: 25px; }
.planet-face { color: rgba(23,78,113,.65); font-size: 15px; letter-spacing: 11px; transform: translateX(5px); }
.planet-ring { position: absolute; width: 170px; height: 38px; border: 7px solid rgba(243,221,135,.92); border-radius: 50%; transform: rotate(-17deg); box-shadow: 0 5px 0 rgba(177,140,118,.16); }
.planet-ring::after { content: ""; position: absolute; width: 106px; height: 53px; left: 25px; bottom: -14px; border-radius: 0 0 80px 80px; background: linear-gradient(145deg, #67d1d4, #4cb8cf); clip-path: inset(50% 0 0 0); }
.orbit { position: absolute; border: 1px dashed rgba(255,255,255,.16); border-radius: 50%; transform: rotate(-18deg); }.orbit-one { width: 215px; height: 92px; right: 22px; top: 67px; }.orbit-two { width: 190px; height: 190px; right: 18px; top: 13px; }
.star { position: absolute; color: #f7d98b; }.s1 { right: 38px; top: 33px; }.s2 { left: 18px; top: 42px; color: #b9b2ff; }.s3 { right: 22px; bottom: 25px; font-size: 30px; }
.mini-code, .mini-data { position: absolute; padding: 6px 8px; border: 1px solid rgba(255,255,255,.13); border-radius: 8px; color: #d8d5ff; background: rgba(255,255,255,.08); font: 9px ui-monospace, monospace; }.mini-code { left: 12px; bottom: 39px; transform: rotate(-8deg); }.mini-data { right: 17px; top: 91px; transform: rotate(8deg); }

.focus-card { padding: 20px; }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.panel-heading h2 { margin: 5px 0 0; font-size: 16px; }
.time-chip { padding: 6px 9px; border-radius: 8px; color: #7771a1; background: #f2f0fb; font-size: 9px; font-weight: 700; }
.focus-progress { margin: 17px 0 13px; display: flex; align-items: center; gap: 10px; }.focus-progress div { height: 5px; flex: 1; overflow: hidden; border-radius: 5px; background: #eeeff4; }.focus-progress span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--purple), #8b7df1); }.focus-progress b { color: var(--purple); font-size: 10px; }
.focus-topic { width: 100%; padding: 13px; display: flex; align-items: center; gap: 11px; border: 1px solid #eeedf5; border-radius: 12px; background: #fafafd; text-align: left; }.focus-topic:hover { border-color: #d9d4ff; background: #f8f6ff; }.focus-topic > span:nth-child(2) { display: flex; min-width: 0; flex-direction: column; }.focus-topic small { margin-bottom: 4px; color: var(--purple); font-size: 8px; }.focus-topic strong { overflow: hidden; font-size: 11px; white-space: nowrap; text-overflow: ellipsis; }.focus-topic em { margin-top: 4px; color: #989daf; font-size: 8px; font-style: normal; }.focus-topic > b { margin-left: auto; color: #a9adba; font-size: 18px; }
.topic-icon { width: 38px; height: 38px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 11px; font: 700 12px ui-monospace, monospace; }.topic-icon.violet { color: var(--purple); background: var(--purple-soft); }.topic-icon.mint { color: #199c92; background: var(--cyan-soft); }
.focus-footer { margin-top: 16px; display: flex; align-items: center; justify-content: space-between; color: #959aac; font-size: 9px; }.focus-footer span { display: flex; align-items: center; gap: 5px; }.focus-footer i { width: 6px; height: 6px; border-radius: 50%; background: var(--orange); }.focus-footer button { color: var(--purple); background: transparent; font-size: 9px; font-weight: 700; }

.section-heading { margin: 27px 2px 14px; display: flex; align-items: end; justify-content: space-between; }.section-heading h2 { margin: 5px 0 0; font-size: 19px; }.link-button { color: var(--purple); background: transparent; font-size: 10px; font-weight: 700; }
.journey-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.journey-card { position: relative; min-height: 160px; padding: 17px; overflow: hidden; border: 1px solid var(--line); border-radius: 16px; background: #fff; box-shadow: 0 9px 26px rgba(32,36,69,.045); text-align: left; transition: .22s ease; }.journey-card:hover { transform: translateY(-4px); border-color: #dcd8fc; box-shadow: var(--shadow); }.journey-card.locked { filter: saturate(.7); }.journey-card-top { display: flex; align-items: center; justify-content: space-between; }.journey-number { color: #c0c3ce; font: 800 10px ui-monospace, monospace; }.journey-status { padding: 4px 7px; border-radius: 10px; color: var(--purple); background: var(--purple-soft); font-size: 8px; font-style: normal; }.journey-status.done { color: #20865f; background: #e4f7ef; }.journey-visual { width: 46px; height: 46px; margin: 14px 0 12px; display: grid; place-items: center; border-radius: 14px; font-size: 19px; font-weight: 800; }.journey-card:nth-child(1) .journey-visual { color: #e2923c; background: #fff1dd; }.journey-card:nth-child(2) .journey-visual { color: #189f9a; background: #e4f8f6; }.journey-card:nth-child(3) .journey-visual { color: var(--purple); background: var(--purple-soft); }.journey-card:nth-child(4) .journey-visual { color: #e07375; background: #ffecee; }.journey-card h3 { margin-bottom: 4px; font-size: 13px; }.journey-card p { margin-bottom: 12px; overflow: hidden; color: var(--muted); font-size: 9px; line-height: 1.5; white-space: nowrap; text-overflow: ellipsis; }.journey-meta { display: flex; justify-content: space-between; color: #9ea3b4; font-size: 8px; }
.dashboard-lower { margin-top: 16px; display: grid; grid-template-columns: 1.35fr 1fr; gap: 15px; }.ask-card { min-height: 116px; padding: 20px; display: flex; align-items: center; gap: 15px; background: linear-gradient(120deg, #f1efff, #f7f5ff); }.ask-orb { width: 54px; height: 54px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 17px; color: #fff; background: linear-gradient(145deg, #7c6df2, #5446ca); box-shadow: 0 10px 20px rgba(84,70,202,.2); font-size: 22px; }.ask-card h2 { margin: 4px 0; font-size: 15px; }.ask-card p { margin: 0; color: var(--muted); font-size: 9px; }.ask-card .primary-button { margin-left: auto; white-space: nowrap; }.primary-button.compact { min-height: 37px; padding-inline: 14px; font-size: 10px; }
.dashboard-assignment{margin-top:16px;padding:16px 19px;display:flex;align-items:center;gap:14px;background:linear-gradient(110deg,#fff,#f8f7ff)}.assignment-reminder-icon{width:43px;height:43px;flex:0 0 auto;display:grid;place-items:center;border-radius:13px;color:#fff;background:linear-gradient(145deg,var(--orange),#ec8940);box-shadow:0 8px 18px rgba(235,139,58,.2);font-size:18px;font-weight:800}.dashboard-assignment>div:nth-child(2){min-width:0}.dashboard-assignment h2{margin:4px 0;font-size:14px}.dashboard-assignment p{margin:0;color:var(--muted);font-size:9px}.dashboard-assignment .primary-button{margin-left:auto;white-space:nowrap}
.achievement-card { padding: 18px; }.circle-more { width: 28px; height: 28px; border-radius: 50%; background: #f5f5f8; }.badge-row { margin-top: 11px; display: flex; align-items: center; gap: 11px; }.badge-medal { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; background: linear-gradient(145deg,#fff2bb,#f5bd54); font-size: 23px; box-shadow: inset 0 0 0 5px rgba(255,255,255,.48); }.badge-row > div:nth-child(2) { min-width: 0; }.badge-row strong { font-size: 11px; }.badge-row p { margin: 3px 0 0; color: var(--muted); font-size: 8px; }.badge-row > span { margin-left: auto; padding: 5px 7px; border-radius: 8px; color: #b0741d; background: #fff2da; font-size: 8px; font-weight: 800; white-space: nowrap; }

/* shared module pages */
.module-header { margin-bottom: 23px; display: flex; align-items: end; justify-content: space-between; gap: 24px; }.module-header h1 { margin: 7px 0 8px; font-size: clamp(25px, 3vw, 34px); letter-spacing: -.04em; }.module-header p { margin: 0; color: var(--muted); font-size: 12px; }.mode-badge { padding: 9px 12px; display: flex; align-items: center; gap: 7px; border: 1px solid #dfeee9; border-radius: 10px; color: #43806b; background: #f4fbf8; font-size: 9px; white-space: nowrap; }.mode-badge i { width: 6px; height: 6px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 3px rgba(57,185,128,.12); }
.outline-button { min-height: 39px; padding: 0 15px; border: 1px solid #dedfea; border-radius: 10px; color: #565e74; background: #fff; font-size: 10px; font-weight: 700; }.outline-button:hover { border-color: var(--purple); color: var(--purple); }

/* chat */
.chat-layout { display: grid; grid-template-columns: minmax(0, 1fr) 255px; gap: 17px; }.chat-panel { height: calc(100vh - 167px); min-height: 570px; display: flex; flex-direction: column; overflow: hidden; }.chat-top { min-height: 65px; padding: 12px 18px; display: flex; align-items: center; gap: 10px; border-bottom: 1px solid var(--line); }.tutor-avatar { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 12px; color: #fff; background: linear-gradient(145deg, #73d9d2, #6656e8); box-shadow: 0 7px 16px rgba(87,78,191,.18); }.chat-top > div:nth-child(2) { display: flex; flex-direction: column; }.chat-top strong { font-size: 12px; }.chat-top span { margin-top: 3px; color: #9499ab; font-size: 8px; }.chat-top span i { width: 5px; height: 5px; display: inline-block; margin-right: 4px; border-radius: 50%; background: var(--green); }.chat-top .icon-button { margin-left: auto; }
.messages { flex: 1; padding: 22px 24px; overflow-y: auto; background: linear-gradient(#fff, #fdfdff); }.message { max-width: 78%; margin-bottom: 18px; display: flex; gap: 9px; animation: message-in .25s ease; }@keyframes message-in { from { opacity:0; transform:translateY(5px) } }.message.user { margin-left: auto; justify-content: flex-end; }.message-avatar { width: 28px; height: 28px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 9px; color: #fff; background: linear-gradient(145deg,#6ad5d0,#6656e8); font-size: 11px; }.message-bubble { padding: 11px 14px; border-radius: 4px 14px 14px 14px; color: #465067; background: #f2f2f8; font-size: 12px; line-height: 1.75; white-space: pre-wrap; }.message-bubble code { padding: 2px 5px; border-radius: 4px; color: var(--purple-dark); background: #e7e3ff; font: 11px ui-monospace, monospace; }.message.user .message-bubble { color: #fff; border-radius: 14px 4px 14px 14px; background: var(--purple); }.message-time { display: block; margin-top: 4px; color: #adb1bf; font-size: 7px; }.message.user .message-time { text-align: right; }.typing { display: flex; gap: 3px; }.typing i { width: 5px; height: 5px; border-radius: 50%; background: #989eaf; animation: typing 1s infinite alternate; }.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}@keyframes typing{to{transform:translateY(-4px);opacity:.45}}
.suggestion-row { padding: 0 20px 10px; display: flex; gap: 7px; overflow-x: auto; }.suggestion-row button { padding: 7px 10px; border: 1px solid #e4e1fb; border-radius: 15px; color: #665f91; background: #faf9ff; font-size: 8px; white-space: nowrap; }.suggestion-row button:hover { color: var(--purple); background: var(--purple-soft); }.composer { margin: 0 17px 17px; padding: 7px; display: flex; align-items: end; gap: 7px; border: 1px solid #dedfe8; border-radius: 14px; background: #fff; box-shadow: 0 7px 20px rgba(30,33,59,.06); }.composer:focus-within { border-color: #b8b0f5; box-shadow: 0 0 0 3px rgba(102,86,232,.08); }.composer textarea { min-height: 34px; max-height: 100px; flex: 1; padding: 8px 5px; resize: none; border: 0; outline: 0; color: var(--ink); font-size: 11px; }.attach-button,.voice-button,.send-button { width: 34px; height: 34px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 10px; }.attach-button,.voice-button { color: #8990a3; background: transparent; font-size: 18px; }.send-button { color: #fff; background: var(--purple); font-size: 18px; }.voice-button.listening { color: #fff; background: var(--red); animation: listen 1s infinite; }@keyframes listen{50%{box-shadow:0 0 0 5px rgba(230,101,114,.14)}}
.chat-aside { display: flex; flex-direction: column; gap: 13px; }.context-card,.coach-card { padding: 17px; }.context-card h3 { margin: 5px 0 14px; font-size: 14px; }.context-topic { display: flex; align-items: center; gap: 9px; }.context-topic > div { display: flex; flex-direction: column; }.context-topic strong { font-size: 10px; }.context-topic small { margin-top: 4px; color: var(--muted); font-size: 8px; }.mini-progress { height: 4px; margin-top: 12px; overflow: hidden; border-radius: 4px; background: #ececf3; }.mini-progress span { display: block; height: 100%; border-radius: inherit; background: var(--cyan); }.coach-icon { width: 35px; height: 35px; margin-bottom: 10px; display: grid; place-items: center; border-radius: 11px; background: #fff1d9; }.coach-card strong { font-size: 11px; }.coach-card p { margin: 6px 0 0; color: var(--muted); font-size: 9px; line-height: 1.65; }.aside-action { width: 100%; padding: 13px; display: flex; align-items: center; gap: 9px; border: 1px solid #e4e1fb; border-radius: 13px; background: #f7f5ff; text-align: left; }.aside-action > span { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 9px; color: var(--purple); background: #e8e3ff; font: 700 10px ui-monospace,monospace; }.aside-action > div { display:flex;flex-direction:column }.aside-action strong{font-size:9px}.aside-action small{margin-top:3px;color:var(--muted);font-size:7px}.aside-action b{margin-left:auto;color:var(--purple)}

/* assignments */
.assignment-heading{align-items:center}.assignment-summary{display:grid;grid-template-columns:repeat(3,92px);overflow:hidden;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow)}.assignment-summary>div{padding:12px 14px;display:flex;flex-direction:column;border-left:1px solid var(--line)}.assignment-summary>div:first-child{border-left:0}.assignment-summary span{color:var(--muted);font-size:8px}.assignment-summary strong{margin-top:4px;font-size:20px}.assignment-summary>div:first-child strong{color:var(--orange)}.assignment-summary>div:nth-child(2) strong{color:var(--purple)}.assignment-summary>div:last-child strong{color:var(--green)}
.assignment-toolbar{margin-bottom:14px;padding:4px;display:inline-flex;gap:2px;border-radius:11px;background:#eaeaef}.assignment-toolbar button{height:34px;padding:0 15px;border-radius:8px;color:var(--muted);background:transparent;font-size:9px;font-weight:700}.assignment-toolbar button.active{color:var(--purple);background:#fff;box-shadow:0 4px 11px rgba(24,29,61,.08)}
.student-assignment-layout{display:grid;grid-template-columns:minmax(300px,.72fr) minmax(430px,1.28fr);gap:15px;align-items:start}.student-assignment-list{display:flex;flex-direction:column;gap:9px}.student-assignment-card{width:100%;padding:15px;display:grid;grid-template-columns:42px minmax(0,1fr) auto;align-items:center;gap:12px;border:1px solid var(--line);border-radius:15px;background:#fff;box-shadow:0 8px 24px rgba(24,29,61,.045);text-align:left;transition:.2s}.student-assignment-card:hover,.student-assignment-card.active{border-color:#cfc9fb;transform:translateY(-1px);box-shadow:0 12px 28px rgba(78,64,184,.1)}.student-assignment-card.active{background:#faf9ff}.student-assignment-type{width:42px;height:42px;display:grid;place-items:center;border-radius:12px;color:var(--purple);background:var(--purple-soft);font-size:17px}.student-assignment-card.overdue .student-assignment-type{color:var(--red);background:#fff0f1}.student-assignment-copy{min-width:0;display:flex;flex-direction:column}.student-assignment-copy strong{overflow:hidden;white-space:nowrap;text-overflow:ellipsis;font-size:11px}.student-assignment-copy small{margin-top:5px;color:var(--muted);font-size:8px}.student-assignment-side{text-align:right}.assignment-status{display:inline-flex;padding:5px 8px;border-radius:10px;font-size:7px;font-style:normal;font-weight:800}.assignment-status.pending{color:#a96d22;background:#fff3df}.assignment-status.submitted{color:var(--purple);background:var(--purple-soft)}.assignment-status.graded{color:#21815e;background:#e6f8ef}.assignment-status.overdue{color:#b54b57;background:#fff0f1}.student-assignment-side small{display:block;margin-top:6px;color:var(--muted);font-size:7px}.assignment-loading,.student-assignment-empty{padding:45px 20px;border:1px dashed #dfe0e8;border-radius:15px;color:var(--muted);background:rgba(255,255,255,.65);text-align:center;font-size:10px}
.assignment-detail{min-height:450px;padding:24px;position:sticky;top:88px}.assignment-detail-empty{min-height:400px;display:grid;place-items:center;align-content:center;text-align:center}.assignment-detail-empty>span{width:58px;height:58px;display:grid;place-items:center;border-radius:18px;color:var(--purple);background:var(--purple-soft);font-size:24px}.assignment-detail-empty h2{margin:14px 0 6px;font-size:17px}.assignment-detail-empty p{color:var(--muted);font-size:9px}.assignment-detail-top{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.assignment-detail-top h2{margin:6px 0 8px;font-size:22px}.assignment-detail-meta{display:flex;flex-wrap:wrap;gap:7px}.assignment-detail-meta span{padding:5px 8px;border-radius:8px;color:#686f83;background:#f1f2f6;font-size:8px}.assignment-score{text-align:right}.assignment-score strong{display:block;color:var(--purple);font-size:24px}.assignment-score small{color:var(--muted);font-size:8px}.assignment-description{margin:20px 0;padding:16px;border-left:3px solid var(--purple);border-radius:0 11px 11px 0;background:#f8f7ff}.assignment-description strong{font-size:10px}.assignment-description p{margin:7px 0 0;color:#596078;font-size:10px;line-height:1.8;white-space:pre-wrap}.assignment-submit-form label{display:block;margin-bottom:7px;color:#555d73;font-size:9px;font-weight:750}.assignment-submit-form textarea{width:100%;min-height:150px;padding:13px;border:1px solid #dedfe8;border-radius:11px;outline:0;resize:vertical;color:var(--ink);background:#fcfcfe;font-size:11px;line-height:1.7}.assignment-submit-form textarea:focus{border-color:var(--purple);box-shadow:0 0 0 3px rgba(102,86,232,.08)}.assignment-submit-form textarea:disabled{color:#777;background:#f3f4f7}.assignment-form-footer{margin-top:9px;display:flex;align-items:center;justify-content:space-between;gap:12px}.assignment-form-footer small{color:var(--muted);font-size:8px}.assignment-form-footer button:disabled{opacity:.55;cursor:not-allowed;transform:none}.assignment-feedback{margin-top:17px;padding:15px;border:1px solid #ccebdc;border-radius:12px;background:#effaf5}.assignment-feedback>div{display:flex;align-items:center;justify-content:space-between}.assignment-feedback strong{color:#27785a;font-size:10px}.assignment-feedback b{color:#21815e;font-size:17px}.assignment-feedback p{margin:8px 0 0;color:#477060;font-size:10px;line-height:1.7;white-space:pre-wrap}.assignment-locked-note{margin-top:10px;padding:10px;border-radius:9px;color:#8b6468;background:#fff3f4;font-size:9px}

/* story */
.sound-pill { padding: 10px 14px; border-radius: 19px; color: var(--purple); background: var(--purple-soft); font-size: 10px; font-weight: 700; }.sound-pill.speaking { color: #fff; background: var(--purple); }.story-shell { padding: 18px; }.book-page { min-height: 520px; display: grid; grid-template-columns: 1.15fr .85fr; overflow: hidden; border-radius: 14px; background: #fffaf0; }.story-art { position: relative; min-height: 440px; overflow: hidden; background: linear-gradient(180deg,#9adfe5 0%,#c7eee8 60%,#8fd19e 60%,#6eb982 100%); transition: background .4s; }.story-art::before { content:"";position:absolute;width:105px;height:105px;right:10%;top:11%;border-radius:50%;background:#fff4b0;box-shadow:0 0 45px rgba(255,237,128,.7) }.story-art::after { content:"";position:absolute;width:180px;height:180px;left:17%;bottom:15%;border-radius:42% 42% 48% 48%;background:linear-gradient(145deg,#7768e9,#5144c7);box-shadow:0 20px 35px rgba(46,55,79,.18) }.story-art[data-page="1"] { background:linear-gradient(180deg,#8ab9e9,#d2e9f3 64%,#9fc88c 64%) }.story-art[data-page="2"] { background:linear-gradient(180deg,#f1bd86,#fbe1b1 64%,#d29a68 64%) }.story-art[data-page="3"] { background:linear-gradient(180deg,#45538e,#8489c4 63%,#353c70 63%) }.story-prop { position:absolute;z-index:3;display:grid;place-items:center;filter:drop-shadow(0 9px 12px rgba(38,49,80,.2)); }.robot { width:88px;height:105px;left:34%;bottom:21%;border:8px solid #e9edff;border-radius:27px 27px 23px 23px;background:#6960dc;font-size:35px }.robot::before{content:"";position:absolute;width:59px;height:37px;top:11px;border-radius:14px;background:#262c52}.robot::after{content:"•  •";position:absolute;top:17px;color:#79e4dc;font-size:19px;letter-spacing:5px}.story-fruit{width:54px;height:54px;border-radius:50% 45% 48%;font-size:28px}.fruit-one{left:12%;bottom:15%;background:#ffdd5d}.fruit-two{right:16%;bottom:14%;background:#f77d6b}.story-cloud{position:absolute;width:110px;height:28px;left:8%;top:16%;border-radius:30px;background:rgba(255,255,255,.72);box-shadow:28px -10px 0 rgba(255,255,255,.72)}.story-copy { padding: clamp(35px,5vw,72px); display:flex;flex-direction:column;justify-content:center;background:radial-gradient(circle at 80% 10%,#fff4ce,transparent 32%),#fffaf0 }.story-copy > span{color:#c38942;font-size:9px;font-weight:800;letter-spacing:.18em}.story-copy h2{margin:10px 0 18px;font-family:Georgia,"STKaiti",serif;font-size:clamp(25px,3vw,37px);line-height:1.25;color:#39324d}.story-copy p{color:#6f665e;font-family:Georgia,"STKaiti",serif;font-size:15px;line-height:2}.story-question{margin-top:14px;padding:13px 14px;border-left:3px solid var(--orange);border-radius:0 10px 10px 0;color:#805f34;background:#fff1d6;font-size:10px;line-height:1.6}.book-controls{padding:16px 6px 0;display:flex;align-items:center;justify-content:center;gap:18px}.book-controls button{padding:9px 12px;border-radius:9px;color:#5f6476;background:#f1f2f6;font-size:10px}.book-controls button:disabled{opacity:.35;cursor:not-allowed}.book-controls>span{color:var(--muted);font-size:9px}.page-dots{display:flex;gap:6px}.page-dots i{width:6px;height:6px;border-radius:50%;background:#d8d9e1}.page-dots i.active{width:18px;border-radius:5px;background:var(--purple)}

/* algorithm */
.xp-chip { padding: 10px 13px; border: 1px solid #f4dfb8; border-radius: 11px; color: #aa731e; background: #fff8e9; font-size: 11px; font-weight: 800; }.xp-chip small { display:block;margin-top:2px;color:#bc9b67;font-size:7px;font-weight:500 }.lab-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(240px,.62fr);gap:16px}.lab-stage{padding:18px}.lab-tools{display:flex;align-items:end;gap:8px}.lab-tools label{flex:1;color:var(--muted);font-size:8px;font-weight:700;letter-spacing:.04em}.lab-tools input{width:100%;margin-top:5px;padding:10px 12px;border:1px solid #dddfe8;border-radius:9px;outline:0;color:var(--ink);background:#fafafd;font-size:11px}.lab-tools input:focus{border-color:var(--purple)}.lab-tools button{height:36px;padding:0 12px;border-radius:9px;color:var(--purple);background:var(--purple-soft);font-size:9px;font-weight:700}.bars{height:335px;margin-top:15px;padding:48px 18px 25px;display:flex;align-items:end;justify-content:center;gap:clamp(7px,1.3vw,14px);overflow:hidden;border:1px solid #edeef3;border-radius:13px;background:repeating-linear-gradient(0deg,#fafbfe,#fafbfe 54px,#eceef4 55px)}.bar-wrap{height:100%;flex:1;max-width:65px;display:flex;flex-direction:column;align-items:center;justify-content:flex-end}.algo-bar{position:relative;width:100%;min-width:22px;border-radius:9px 9px 4px 4px;background:linear-gradient(180deg,#8375f2,#5b4ed7);box-shadow:0 8px 16px rgba(87,73,205,.18);transition:.3s}.algo-bar b{position:absolute;top:-24px;left:50%;transform:translateX(-50%);font-size:11px}.bar-wrap>small{margin-top:6px;color:#aaaebc;font-size:7px}.bar-wrap.compare .algo-bar{transform:translateY(-5px);background:linear-gradient(#ffc16c,#f29a40)}.bar-wrap.sorted .algo-bar{background:linear-gradient(#60d49f,#2eac75)}.bar-wrap.swap .algo-bar{animation:bar-pulse .38s}@keyframes bar-pulse{50%{transform:translateY(-10px) scale(1.04)}}.lab-narration{min-height:64px;margin-top:12px;padding:11px 13px;display:flex;align-items:center;gap:10px;border:1px solid #e9e6ff;border-radius:11px;background:#f8f7ff}.lab-narration>span{width:33px;height:33px;display:grid;place-items:center;border-radius:9px;background:#e9e5ff}.lab-narration strong{font-size:10px}.lab-narration p{margin:3px 0 0;color:var(--muted);font-size:8px}.lab-controls{margin-top:12px;display:flex;align-items:center;gap:7px}.lab-controls button{height:37px;min-width:37px;padding:0 12px;border-radius:9px;background:#eff0f5;font-size:10px;font-weight:700}.lab-controls .play{min-width:112px;color:#fff;background:var(--purple)}.lab-controls label{margin-left:auto;color:var(--muted);font-size:8px}.lab-controls select{padding:7px;border:1px solid var(--line);border-radius:7px;background:white}.lab-side{display:flex;flex-direction:column;gap:12px}.code-card{padding:17px}.code-card .panel-heading h2{margin:0}.code-card .panel-heading span{color:var(--muted);font:8px ui-monospace,monospace}.code-card pre{margin:13px 0 0;padding:10px 0;overflow:auto;border-radius:11px;color:#cdd2e5;background:#20243a;font:9px/2 ui-monospace,monospace}.code-card code{display:block;padding:0 12px;border-left:3px solid transparent;white-space:pre}.code-card code.active{color:#fff;border-left-color:#64ded5;background:rgba(100,222,213,.12)}.stats-card{padding:14px;display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.stats-card div{text-align:center}.stats-card strong{display:block;color:var(--purple);font-size:20px}.stats-card span{color:var(--muted);font-size:7px}.think-card{padding:14px;display:flex;gap:9px;border:1px solid #ccefeb;border-radius:14px;color:#2a6866;background:#ecfbf8}.think-card>span{font-size:18px}.think-card strong{font-size:9px}.think-card p{margin:4px 0 0;font-size:8px;line-height:1.55}

/* quiz */
.quiz-wrap{width:min(820px,100%);margin:0 auto}.quiz-head{display:flex;align-items:end;justify-content:space-between}.quiz-head h1{margin:7px 0;font-size:31px}.quiz-head p{color:var(--muted);font-size:11px}.quiz-score{text-align:right}.quiz-score span{display:block;color:var(--muted);font-size:8px}.quiz-score strong{color:var(--purple);font-size:30px}.quiz-score small{color:var(--muted);font-size:9px}.level-track{margin:22px auto;display:flex;align-items:center;justify-content:center}.level-track span,.level-track b{width:27px;height:27px;display:grid;place-items:center;border:2px solid #dfe0e8;border-radius:50%;color:#a7abba;background:#fff;font-size:9px}.level-track span.active{border-color:var(--purple);color:#fff;background:var(--purple);box-shadow:0 0 0 5px var(--purple-soft)}.level-track span.done{border-color:var(--green);color:#fff;background:var(--green)}.level-track i{width:75px;height:2px;background:#dfe0e8}.level-track i.done{background:var(--green)}.level-track b{border:0;background:#fff5dc;font-size:14px}.quiz-card{padding:27px 32px}.quiz-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:9px}.quiz-meta em{padding:4px 7px;border-radius:8px;color:var(--purple);background:var(--purple-soft);font-style:normal}.quiz-card h2{margin:20px 0;font-size:20px;line-height:1.55}.answers{display:grid;grid-template-columns:1fr 1fr;gap:10px}.answer{min-height:52px;padding:10px 13px;display:flex;align-items:center;gap:10px;border:1px solid #e4e5ec;border-radius:11px;background:#fff;text-align:left;font-size:11px}.answer:hover{border-color:#bbb4f3;background:#faf9ff}.answer.selected{border-color:var(--purple);background:#f1efff}.answer.correct{border-color:var(--green);color:#257555;background:#eaf9f2}.answer.wrong{border-color:var(--red);color:#a84752;background:#fff0f1}.answer-letter{width:27px;height:27px;display:grid;place-items:center;border-radius:8px;color:#73798c;background:#f1f2f6;font-weight:800}.selected .answer-letter{color:#fff;background:var(--purple)}.correct .answer-letter{color:#fff;background:var(--green)}.wrong .answer-letter{color:#fff;background:var(--red)}.feedback{display:none;margin-top:14px;padding:11px 13px;border-radius:10px;color:#3d735d;background:#ebf8f1;font-size:9px;line-height:1.6}.feedback.show{display:block}.feedback.wrong{color:#8c4d53;background:#fff0f1}.quiz-next{min-width:120px;margin:18px 0 0 auto;display:flex}.quiz-next:disabled{opacity:.45;cursor:not-allowed;transform:none}.quiz-result{display:none;padding:50px;text-align:center}.quiz-result.show{display:block}.quiz-card.hidden{display:none}.result-orb{width:75px;height:75px;margin:0 auto 18px;display:grid;place-items:center;border-radius:50%;background:linear-gradient(145deg,#fff4b8,#f4b44f);font-size:35px;box-shadow:0 13px 30px rgba(223,162,65,.22)}.quiz-result h2{font-size:27px}.quiz-result p{color:var(--muted);font-size:12px}.result-actions{display:flex;justify-content:center;gap:17px;margin-top:20px}.confetti{position:fixed;z-index:100;inset:0;pointer-events:none;overflow:hidden}.confetti i{position:absolute;top:-20px;width:8px;height:14px;animation:confetti-fall 2.4s ease-in forwards}@keyframes confetti-fall{to{transform:translateY(110vh) rotate(720deg)}}

/* report */
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.metric{padding:16px;display:flex;align-items:center;gap:11px}.metric-icon{width:41px;height:41px;flex:0 0 auto;display:grid;place-items:center;border-radius:12px;font-weight:800}.metric-icon.purple{color:var(--purple);background:var(--purple-soft)}.metric-icon.cyan{color:#179c99;background:var(--cyan-soft)}.metric-icon.orange{color:#c77b23;background:#fff0dd}.metric-icon.green{color:#23865f;background:#e5f8ef}.metric>div{display:flex;flex-direction:column}.metric small{color:var(--muted);font-size:8px}.metric strong{margin:3px 0;font-size:20px}.metric strong em{font-size:8px;font-style:normal}.trend{color:var(--muted);font-size:7px}.trend.up{color:var(--green)}.report-grid{margin-top:14px;display:grid;grid-template-columns:1fr 1fr;gap:14px}.radar-card,.mastery-card{padding:20px}.update-tag{padding:5px 8px;border-radius:10px;color:#21815e;background:#e6f8ef;font-size:7px}.radar-wrap{height:275px;display:grid;place-items:center}.radar-wrap svg{width:min(100%,360px);height:100%;overflow:visible}.radar-grid polygon,.radar-grid line{fill:none;stroke:#e3e4ec;stroke-width:1}.radar-value{fill:rgba(102,86,232,.22);stroke:var(--purple);stroke-width:2}.radar-labels text{fill:#747b8e;font-size:9px;text-anchor:middle}.mastery-list{margin-top:20px;display:flex;flex-direction:column;gap:17px}.mastery-list>div>span{display:flex;justify-content:space-between;font-size:9px}.mastery-list em{color:var(--purple);font-style:normal;font-weight:700}.mastery-list i{height:6px;margin-top:7px;display:block;overflow:hidden;border-radius:5px;background:#eeeef3}.mastery-list u{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,var(--purple),#9487f1);text-decoration:none}.recommend-button{width:100%;margin-top:22px;padding:12px;display:flex;align-items:center;gap:9px;border-radius:12px;color:#484163;background:#f3f0ff;text-align:left}.recommend-button>span{width:31px;height:31px;display:grid;place-items:center;border-radius:9px;color:#fff;background:var(--purple)}.recommend-button>div{display:flex;flex-direction:column}.recommend-button strong{font-size:9px}.recommend-button p{margin:3px 0 0;color:#77708f;font-size:8px}.recommend-button>b{margin-left:auto}.timeline-card{margin-top:14px;padding:20px}.timeline{margin-top:15px;display:grid;grid-template-columns:repeat(4,1fr);gap:0}.timeline-item{position:relative;padding:0 12px 0 24px;border-left:2px solid #e6e7ed}.timeline-item::before{content:"";position:absolute;width:9px;height:9px;left:-6px;top:2px;border:2px solid #fff;border-radius:50%;background:var(--purple);box-shadow:0 0 0 2px #dcd8ff}.timeline-item small{color:var(--muted);font-size:7px}.timeline-item strong{display:block;margin:5px 0;font-size:9px}.timeline-item span{color:var(--muted);font-size:7px}
.toast{position:fixed;z-index:200;left:50%;bottom:24px;max-width:calc(100% - 30px);padding:10px 15px;border-radius:10px;color:#fff;background:#242941;box-shadow:0 12px 30px rgba(19,23,47,.24);font-size:10px;opacity:0;transform:translate(-50%,18px);pointer-events:none;transition:.25s}.toast.show{opacity:1;transform:translate(-50%,0)}

/* authentication */
.auth-overlay{position:fixed;z-index:500;inset:0;display:none;grid-template-columns:minmax(320px,.9fr) minmax(470px,1.1fr);background:#fff}.auth-overlay.show{display:grid}.auth-visual{position:relative;overflow:hidden;padding:38px;color:#fff;background:radial-gradient(circle at 28% 30%,rgba(104,221,213,.25),transparent 24%),radial-gradient(circle at 72% 68%,rgba(124,103,244,.35),transparent 29%),linear-gradient(145deg,#11152d,#232958)}.auth-visual::before,.auth-visual::after{content:"";position:absolute;border:1px solid rgba(255,255,255,.08);border-radius:50%}.auth-visual::before{width:520px;height:520px;left:-170px;top:70px}.auth-visual::after{width:350px;height:350px;right:-120px;bottom:-100px}.auth-brand{position:relative;z-index:2;display:flex;align-items:center;gap:12px;font-size:18px;letter-spacing:.08em}.auth-planet{position:absolute;width:190px;height:190px;left:50%;top:43%;display:grid;place-items:center;border-radius:50%;background:linear-gradient(145deg,#71ded7,#4aa5c9);box-shadow:inset -30px -18px 45px rgba(29,73,145,.25),0 30px 60px rgba(4,8,30,.32);transform:translate(-50%,-50%)}.auth-planet::before{content:"";position:absolute;width:310px;height:75px;border:13px solid #f2cf77;border-radius:50%;transform:rotate(-16deg)}.auth-planet::after{content:"";position:absolute;width:180px;height:90px;bottom:-4px;border-radius:0 0 100px 100px;background:linear-gradient(145deg,#61cbc9,#459ec4);clip-path:inset(50% 0 0 0)}.auth-planet span{position:relative;z-index:2;color:#fff;font-size:42px}.auth-visual-copy{position:absolute;z-index:2;left:9%;bottom:9%}.auth-visual-copy h2{margin:12px 0;font-size:clamp(24px,3vw,39px);line-height:1.35;letter-spacing:-.03em}.auth-visual-copy p{color:#9ea7cb;font-size:11px;letter-spacing:.15em}.auth-panel{display:grid;place-items:center;padding:35px;background:radial-gradient(circle at 90% 0,#f1efff,transparent 30%),#fff}.auth-form-wrap{width:min(430px,100%)}.auth-form-wrap>h1{margin:9px 0 6px;font-size:30px}.auth-form-wrap>p{color:var(--muted);font-size:11px}.auth-tabs{margin:24px 0 18px;padding:4px;display:grid;grid-template-columns:1fr 1fr;border-radius:11px;background:#f1f2f7}.auth-tabs button{height:36px;border-radius:8px;color:var(--muted);background:transparent;font-size:11px;font-weight:700}.auth-tabs button.active{color:var(--purple);background:#fff;box-shadow:0 5px 14px rgba(30,34,66,.08)}.auth-form{display:none;flex-direction:column;gap:12px}.auth-form.active{display:flex}.auth-form label{display:flex;flex-direction:column;gap:6px;color:#545c71;font-size:9px;font-weight:700}.auth-form input,.auth-form select{width:100%;height:42px;padding:0 12px;border:1px solid #dedfe8;border-radius:10px;outline:0;color:var(--ink);background:#fff;font-size:11px}.auth-form input:focus,.auth-form select:focus{border-color:var(--purple);box-shadow:0 0 0 3px rgba(102,86,232,.08)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}.auth-submit{height:43px;margin-top:4px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;border-radius:10px;color:#fff;background:linear-gradient(100deg,var(--purple),#7566ed);box-shadow:0 9px 22px rgba(87,72,205,.2);font-size:11px;font-weight:750}.auth-submit:disabled{opacity:.55;cursor:wait}.demo-login{padding:7px;color:var(--purple);background:transparent;font-size:9px;font-weight:700}.auth-switch{margin-top:6px;text-align:center;color:var(--muted);font-size:9px;line-height:1.6}.auth-switch button{color:var(--purple);background:transparent;font-weight:700}.auth-error{min-height:18px;margin-top:9px;color:var(--red);font-size:9px;line-height:1.5}.auth-note{margin-top:10px!important;text-align:center;font-size:8px!important}.logout-button{font-size:11px}

.assignment-resources{margin:0 0 18px;display:flex;flex-direction:column;gap:7px}.assignment-resources>strong{margin-bottom:2px;color:#555d73;font-size:9px}.assignment-resource-link{width:100%;padding:10px;display:flex;align-items:center;gap:10px;border:1px solid #e4e2f4;border-radius:10px;background:#faf9ff;text-align:left}.assignment-resource-link>span{width:31px;height:31px;display:grid;place-items:center;border-radius:9px;color:var(--purple);background:var(--purple-soft)}.assignment-resource-link>div{display:flex;min-width:0;flex-direction:column}.assignment-resource-link strong{overflow:hidden;font-size:9px;white-space:nowrap;text-overflow:ellipsis}.assignment-resource-link small{margin-top:3px;color:var(--muted);font-size:7px}.assignment-resource-link>b{margin-left:auto;color:var(--purple);font-size:8px}

/* learning resources */
.resource-total{min-width:110px;padding:13px 16px;border:1px solid #e5e2fb;border-radius:13px;background:#faf9ff;text-align:center}.resource-total strong{display:block;color:var(--purple);font-size:24px}.resource-total span{color:var(--muted);font-size:8px}.student-resource-toolbar{margin-bottom:14px;padding:5px;display:flex;gap:4px;overflow:auto;border-radius:11px;background:#eceef4}.student-resource-toolbar button{padding:8px 13px;border-radius:8px;color:#777d8f;background:transparent;font-size:9px;font-weight:700;white-space:nowrap}.student-resource-toolbar button.active{color:var(--purple);background:#fff;box-shadow:0 4px 12px rgba(30,34,66,.07)}.student-resource-layout{display:grid;grid-template-columns:minmax(300px,.72fr) minmax(440px,1.28fr);gap:15px;align-items:start}.student-resource-grid{display:grid;gap:9px}.student-resource-card{width:100%;padding:13px;display:grid;grid-template-columns:46px minmax(0,1fr) auto;align-items:center;gap:12px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:0 7px 20px rgba(29,34,66,.04);text-align:left;transition:.2s}.student-resource-card:hover,.student-resource-card.active{border-color:#cfc9fb;transform:translateY(-1px);box-shadow:0 11px 27px rgba(78,64,184,.1)}.student-resource-card.active{background:#faf9ff}.student-resource-icon{width:46px;height:46px;display:grid;place-items:center;border-radius:13px;color:var(--purple);background:var(--purple-soft);font-size:17px}.student-resource-icon.type-video{color:#b55565;background:#fff0f2}.student-resource-icon.type-image{color:#168b83;background:#e8f8f5}.student-resource-icon.type-link{color:#ad7128;background:#fff3df}.student-resource-copy{display:flex;min-width:0;flex-direction:column}.student-resource-copy em{color:var(--purple);font-size:7px;font-style:normal;font-weight:750}.student-resource-copy strong{margin:5px 0;overflow:hidden;font-size:11px;white-space:nowrap;text-overflow:ellipsis}.student-resource-copy small{overflow:hidden;color:var(--muted);font-size:7px;white-space:nowrap;text-overflow:ellipsis}.student-resource-card>b{color:#a5a9b7;font-size:18px}.student-resource-empty{padding:50px 20px;border:1px dashed #dfe0e8;border-radius:15px;color:var(--muted);background:rgba(255,255,255,.65);text-align:center;font-size:10px}.resource-viewer{min-height:480px;padding:19px;position:sticky;top:88px;overflow:hidden}.resource-viewer-empty{min-height:440px;display:grid;place-items:center;align-content:center;text-align:center}.resource-viewer-empty>span{width:60px;height:60px;display:grid;place-items:center;border-radius:18px;color:var(--purple);background:var(--purple-soft);font-size:22px}.resource-viewer-empty h2{margin:14px 0 6px;font-size:17px}.resource-viewer-empty p{max-width:300px;color:var(--muted);font-size:9px;line-height:1.7}.student-resource-video,.student-resource-image{width:100%;max-height:390px;display:block;border-radius:13px;background:#171a2d;object-fit:contain}.student-resource-image{background:#f2f3f7}.student-resource-file{min-height:245px;padding:28px;display:grid;place-items:center;align-content:center;border-radius:13px;background:linear-gradient(145deg,#f0edff,#e8e5fc);text-align:center}.student-resource-file>span{color:var(--purple);font-size:42px}.student-resource-file strong{max-width:90%;margin:17px 0 6px;overflow:hidden;font-size:13px;text-overflow:ellipsis}.student-resource-file small{color:var(--muted);font-size:8px}.resource-viewer-copy{padding:19px 3px 3px}.resource-viewer-copy h2{margin:6px 0 8px;font-size:21px}.resource-viewer-copy>p{margin:0;color:var(--muted);font-size:10px;line-height:1.8;white-space:pre-wrap}.resource-viewer-meta{margin-top:13px;display:flex;flex-wrap:wrap;gap:7px}.resource-viewer-meta span{padding:6px 8px;border-radius:8px;color:#676d80;background:#f1f2f6;font-size:8px}.resource-viewer-actions{margin-top:16px;display:flex;gap:8px}.resource-viewer-actions .primary-button{text-decoration:none}

/* structured student courses */
.student-course-shell{display:grid;grid-template-columns:220px 270px minmax(440px,1fr);gap:13px;align-items:start}.student-course-library{display:flex;flex-direction:column;gap:8px}.student-course-card{width:100%;padding:12px;display:grid;grid-template-columns:45px minmax(0,1fr);align-items:start;gap:10px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:0 7px 20px rgba(29,34,66,.04);text-align:left}.student-course-card:hover,.student-course-card.active{border-color:#cfc9fb;background:#faf9ff;box-shadow:0 10px 25px rgba(78,64,184,.09)}.student-course-cover{width:45px;height:55px;display:grid;place-items:center;border-radius:10px;color:#fff;background:linear-gradient(145deg,#7567ef,#5143c7);font-size:17px}.student-course-card-copy{display:grid;grid-template-columns:1fr auto;min-width:0}.student-course-card-copy em{grid-column:1/-1;color:var(--purple);font-size:6px;font-style:normal}.student-course-card-copy strong{grid-column:1/-1;margin:5px 0;overflow:hidden;font-size:10px;white-space:nowrap;text-overflow:ellipsis}.student-course-card-copy small{grid-column:1/-1;color:var(--muted);font-size:7px}.student-course-card-copy i{height:4px;margin-top:8px;overflow:hidden;border-radius:4px;background:#ebeaf2}.student-course-card-copy u{height:100%;display:block;border-radius:inherit;background:var(--purple)}.student-course-card-copy b{margin:5px 0 0 6px;color:var(--purple);font-size:7px}.student-course-outline{max-height:calc(100vh - 125px);position:sticky;top:88px;overflow:auto}.student-course-overview{padding:18px;border-bottom:1px solid var(--line)}.student-course-overview h2{margin:6px 0;font-size:16px}.student-course-overview p{margin:0;color:var(--muted);font-size:8px;line-height:1.6}.student-course-overview>div{margin-top:12px;display:flex;align-items:center;gap:8px}.student-course-overview i{height:5px;flex:1;overflow:hidden;border-radius:5px;background:#ececf2}.student-course-overview u{height:100%;display:block;background:var(--purple)}.student-course-overview b{color:var(--purple);font-size:8px}.student-chapter-list{padding:9px}.student-chapter-list section+section{margin-top:12px}.student-chapter-list h3{margin:0 5px 6px;display:flex;align-items:center;gap:7px;font-size:8px}.student-chapter-list h3 span{color:#a5a8b5;font:7px ui-monospace,monospace}.student-section-link{width:100%;padding:8px;display:grid;grid-template-columns:27px minmax(0,1fr) auto;align-items:center;gap:7px;border-radius:8px;background:transparent;text-align:left}.student-section-link:hover,.student-section-link.active{background:var(--purple-soft)}.student-section-link>i{width:27px;height:27px;display:grid;place-items:center;border-radius:8px;color:var(--purple);background:#f0eeff;font-size:6px;font-style:normal}.student-section-link>span{display:flex;min-width:0;flex-direction:column}.student-section-link strong{overflow:hidden;font-size:7px;white-space:nowrap;text-overflow:ellipsis}.student-section-link small{margin-top:3px;color:var(--muted);font-size:6px}.student-section-link>b{color:#aaaeba}.student-section-link.locked{opacity:.48;cursor:not-allowed}.student-course-empty{padding:35px 18px;color:var(--muted);text-align:center;font-size:9px;line-height:1.7}.student-lesson{min-height:620px;padding:28px}.lesson-empty{min-height:550px;display:grid;place-items:center;align-content:center;text-align:center}.lesson-empty>span{width:60px;height:60px;display:grid;place-items:center;border-radius:18px;color:var(--purple);background:var(--purple-soft);font-size:23px}.lesson-empty h2{margin:14px 0 6px;font-size:17px}.lesson-empty p{max-width:340px;color:var(--muted);font-size:9px;line-height:1.7}.student-lesson-head{padding-bottom:21px;border-bottom:1px solid var(--line)}.student-lesson-head h1{margin:7px 0;font-size:27px}.student-lesson-head>p{margin:0;color:var(--muted);font-size:10px;line-height:1.7}.student-lesson-head>div{margin-top:12px;display:flex;gap:7px}.student-lesson-head>div span{padding:5px 8px;border-radius:7px;color:#656b7d;background:#f1f2f6;font-size:7px}.student-lesson-blocks{display:flex;flex-direction:column;gap:17px;margin-top:21px}.lesson-block{position:relative;padding:19px;border:1px solid #e7e7ed;border-radius:14px;background:#fff}.lesson-block-number{position:absolute;right:15px;top:13px;color:#c3c5ce;font:8px ui-monospace,monospace}.lesson-block h3{margin:5px 0 10px;font-size:16px}.lesson-rich-text{color:#50576c;font-size:11px;line-height:2}.lesson-block-label{display:block;color:var(--purple);font-size:7px;font-weight:800;letter-spacing:.1em}.media-block{padding:13px;background:#f8f8fb}.media-block>.lesson-block-label,.media-block>h3{margin-left:5px}.media-block video,.media-block img{width:100%;max-height:520px;margin-top:10px;display:block;border-radius:10px;background:#171a2d;object-fit:contain}.lesson-file-block{display:flex;align-items:center;gap:12px;background:#faf9ff}.lesson-file-block>span{width:43px;height:43px;display:grid;place-items:center;border-radius:11px;color:var(--purple);background:var(--purple-soft);font-size:19px}.lesson-file-block>div{min-width:0}.lesson-file-block h3{margin:0 0 4px;font-size:11px}.lesson-file-block p{margin:0;color:var(--muted);font-size:8px}.lesson-file-block a{margin-left:auto;padding:8px 10px;border-radius:8px;color:var(--purple);background:var(--purple-soft);font-size:8px;text-decoration:none}.lesson-presentation-block iframe{width:100%;height:560px;margin-top:10px;border:0;border-radius:10px;background:#fff}.lesson-presentation-block .presentation-download{margin-top:12px;padding:9px 12px;display:inline-flex;align-items:center;gap:6px;border-radius:8px;color:var(--purple);background:var(--purple-soft);font-size:8px;text-decoration:none}.course-quiz-block{border-color:#e9defa;background:linear-gradient(145deg,#fff,#faf8ff)}.course-quiz-block fieldset{margin:16px 0;padding:0;border:0}.course-quiz-block legend{margin-bottom:9px;font-size:10px;font-weight:750;line-height:1.6}.course-quiz-block fieldset label{margin:6px 0;padding:9px 11px;display:flex;align-items:center;gap:8px;border:1px solid #e2e3ea;border-radius:9px;background:#fff;font-size:9px}.course-quiz-block fieldset label:has(input:checked){border-color:var(--purple);background:var(--purple-soft)}.course-quiz-block input{accent-color:var(--purple)}.course-quiz-result{margin:12px 0;padding:9px;border-radius:8px;color:var(--muted);background:#f1f2f6;font-size:8px}.course-quiz-result.passed{color:#247859;background:#e7f8ef}.course-quiz-result.failed{color:#a84c57;background:#fff0f1}.course-algorithm-block{background:#20243a;color:#fff}.course-algorithm-block .lesson-block-label{color:#69ded6}.course-algorithm-block>p{color:#aeb5cd;font-size:9px}.course-algorithm-bars{height:230px;margin:18px 0;padding:25px 15px 0;display:flex;align-items:end;justify-content:center;gap:8px;border-radius:11px;background:repeating-linear-gradient(0deg,#292e48,#292e48 44px,#353a55 45px)}.course-algorithm-bars i{position:relative;min-width:28px;max-width:60px;flex:1;border-radius:7px 7px 2px 2px;background:linear-gradient(#7c6ef0,#5d4fd3);transition:.3s}.course-algorithm-bars i.active{background:linear-gradient(#ffc36e,#ef9340);transform:translateY(-5px)}.course-algorithm-bars b{position:absolute;left:50%;top:-20px;color:#fff;font-size:9px;transform:translateX(-50%)}.course-algorithm-status{padding:10px;border-radius:8px;color:#c8cce0;background:#292e48;font-size:8px}.course-algorithm-actions{margin-top:10px;display:flex;justify-content:flex-end;gap:7px}.course-algorithm-actions button{padding:8px 10px;border-radius:8px;color:#c8cce0;background:#343a58;font-size:8px}.course-algorithm-actions .primary{color:#fff;background:var(--purple)}.course-algorithm-question{margin-top:12px;padding:11px;border-left:3px solid #64d8d0;border-radius:0 8px 8px 0;color:#bfe5e1;background:#29354d;font-size:8px;line-height:1.6}.student-lesson-complete{margin-top:20px;padding:17px;display:flex;align-items:center;justify-content:space-between;gap:15px;border-radius:13px;background:#f3f1ff}.student-lesson-complete strong{font-size:10px}.student-lesson-complete p{margin:4px 0 0;color:var(--muted);font-size:8px}.student-lesson-complete button:disabled{opacity:.55}.student-course-heading{align-items:flex-start}@media(max-width:1200px){.student-course-shell{grid-template-columns:210px minmax(300px,1fr)}.student-lesson{grid-column:1/-1}.student-course-outline{position:static;max-height:550px}}@media(max-width:700px){.student-course-shell{grid-template-columns:1fr}.student-course-outline,.student-lesson{grid-column:auto}.student-lesson{padding:16px}.student-lesson-head h1{font-size:22px}.student-lesson-complete{align-items:flex-start;flex-direction:column}.student-lesson-complete button{width:100%}}

@media print{.sidebar,.topbar,.module-header .outline-button{display:none!important}.main-shell{margin:0}.content{width:100%;padding:0}.view{display:none!important}#view-report{display:block!important}.panel{box-shadow:none}.auth-overlay{display:none!important}}

/* Saved WYSIWYG section document */
.student-wysiwyg-document{margin-top:22px;color:#3f4759;font-size:11px;line-height:1.9}.student-wysiwyg-document h1{margin:28px 0 12px;font-size:28px}.student-wysiwyg-document h2{margin:25px 0 10px;font-size:21px}.student-wysiwyg-document h3{margin:21px 0 9px;font-size:16px}.student-wysiwyg-document p{margin:10px 0}.student-wysiwyg-document blockquote{margin:16px 0;padding:12px 16px;border-left:4px solid var(--purple);background:#f7f5ff}.student-wysiwyg-document a{color:var(--purple)}.student-wysiwyg-document figure{margin:24px 0}.student-wysiwyg-document img,.student-wysiwyg-document video{width:100%;max-height:560px;display:block;border-radius:10px;background:#141827;object-fit:contain}.student-wysiwyg-document figcaption{margin-top:7px;color:var(--muted);font-size:8px;text-align:center}.student-wysiwyg-document .wysiwyg-attachment{padding:14px 16px;border:1px solid var(--line);border-radius:10px;background:#faf9ff}.student-wysiwyg-document .wysiwyg-attachment a{text-decoration:none;font-weight:700}.student-wysiwyg-document .wysiwyg-formula{display:inline-block;padding:4px 8px;border-radius:6px;background:#f1f2f6;font-family:Georgia,serif;font-style:italic}.student-wysiwyg-document table{width:100%;margin:18px 0;border-collapse:collapse}.student-wysiwyg-document td,.student-wysiwyg-document th{min-width:70px;padding:9px;border:1px solid #dfe1e8}

@media (max-width: 1100px) {
    .welcome-grid { grid-template-columns: 1fr; }.welcome-card{min-height:220px}.focus-card{display:grid;grid-template-columns:1fr 1.2fr;gap:10px}.focus-card .panel-heading{grid-column:1/-1}.focus-progress{grid-column:1}.focus-topic{grid-row:2/4;grid-column:2}.focus-footer{grid-column:1}.journey-grid{grid-template-columns:1fr 1fr}.metric-grid{grid-template-columns:1fr 1fr}.chat-layout{grid-template-columns:1fr}.chat-aside{display:grid;grid-template-columns:1fr 1fr 1fr}.chat-panel{height:650px}.lab-grid{grid-template-columns:1fr}.lab-side{display:grid;grid-template-columns:1.5fr .7fr 1fr}.code-card{grid-row:span 2}
    .assignment-heading{align-items:flex-start}.assignment-summary{grid-template-columns:repeat(3,78px)}.student-assignment-layout,.student-resource-layout{grid-template-columns:1fr}.assignment-detail,.resource-viewer{position:static}
}
@media (max-width: 800px) {
    .sidebar{transform:translateX(-105%);transition:.25s}.sidebar.open{transform:translateX(0)}.main-shell{margin-left:0}.menu-button{display:grid;place-items:center}.topbar{padding:0 16px}.content{width:min(100% - 28px,1280px);padding-top:20px}.welcome-copy{max-width:68%}.dashboard-lower,.report-grid{grid-template-columns:1fr}.story-heading{align-items:start}.book-page{grid-template-columns:1fr}.story-art{min-height:340px}.story-copy{padding:35px}.chat-aside{grid-template-columns:1fr 1fr}.chat-aside .aside-action{grid-column:1/-1}.timeline{grid-template-columns:1fr 1fr;gap:18px}.lab-side{grid-template-columns:1fr 1fr}.code-card{grid-row:span 2}
}
@media (max-width: 560px) {
    .crumb b,.crumb strong{display:none}.grade-switch>span,.streak small{display:none}.grade-switch select{max-width:88px}.content{width:min(100% - 18px,1280px)}.welcome-card{padding:25px 20px;min-height:300px}.welcome-copy{max-width:100%}.welcome-copy p{max-width:74%}.planet-scene{opacity:.7;right:-48px;bottom:-20px}.welcome-actions{align-items:start;flex-direction:column;gap:8px}.focus-card{display:block}.focus-topic{margin-bottom:10px}.journey-grid{grid-template-columns:1fr 1fr;gap:8px}.journey-card{padding:13px}.dashboard-lower{grid-template-columns:1fr}.ask-card{align-items:flex-start;flex-wrap:wrap}.ask-card .primary-button{margin-left:69px}.module-header{align-items:flex-start;flex-direction:column}.chat-aside{grid-template-columns:1fr}.chat-panel{min-height:580px}.message{max-width:90%}.story-art{min-height:300px}.story-copy{padding:28px 22px}.book-controls{gap:8px}.lab-tools{flex-wrap:wrap}.lab-tools label{flex-basis:100%}.bars{height:280px;padding-inline:8px;gap:5px}.lab-controls{flex-wrap:wrap}.lab-controls label{width:100%;text-align:right}.lab-side{grid-template-columns:1fr}.code-card{grid-row:auto}.answers{grid-template-columns:1fr}.quiz-card{padding:22px 17px}.level-track i{width:42px}.metric-grid{grid-template-columns:1fr 1fr;gap:8px}.metric{padding:12px;align-items:flex-start;flex-direction:column}.timeline{grid-template-columns:1fr}.result-actions{align-items:center;flex-direction:column}.quiz-head{align-items:start}.quiz-score strong{font-size:24px}
    .dashboard-assignment{align-items:flex-start;flex-wrap:wrap}.dashboard-assignment .primary-button{margin-left:57px}.assignment-summary{width:100%;grid-template-columns:repeat(3,1fr)}.assignment-toolbar{width:100%;overflow:auto}.assignment-toolbar button{flex:1;padding-inline:9px;white-space:nowrap}.student-assignment-card{grid-template-columns:38px minmax(0,1fr)}.student-assignment-type{width:38px;height:38px}.student-assignment-side{grid-column:2;display:flex;align-items:center;justify-content:space-between;text-align:left}.assignment-detail{padding:18px}.assignment-detail-top h2{font-size:18px}.resource-total{width:100%}.resource-viewer{padding:13px}.student-resource-video,.student-resource-image{max-height:260px}
}
@media (max-width:760px){.auth-overlay{grid-template-columns:1fr}.auth-visual{display:none}.auth-panel{padding:25px}.form-row{grid-template-columns:1fr}}
@media (prefers-reduced-motion: reduce) { *,*::before,*::after { scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important } }

/* Saved editor paragraph styles */
.student-wysiwyg-document .editor-p{margin:0;color:#333;font-size:16px;font-weight:400}.student-wysiwyg-document .editor-h1{margin:24px 0 16px;color:#1a1a1a;font-size:28px;font-weight:700;line-height:1.4}.student-wysiwyg-document .editor-h2{margin:20px 0 12px;color:#2a2a2a;font-size:22px;font-weight:700;line-height:1.45}.student-wysiwyg-document .editor-h3{margin:16px 0 8px;color:#333;font-size:18px;font-weight:600;line-height:1.5}

/* Student "My Courses" catalog and detail page. */
.student-course-catalog{min-height:620px}.student-course-catalog[hidden],.student-course-detail-page[hidden]{display:none!important}.student-course-catalog .student-course-heading{margin-bottom:24px}.student-course-catalog .student-course-heading h1{margin-bottom:8px}.student-course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.student-course-grid .student-course-card{width:100%;padding:0;display:block;overflow:hidden;border:1px solid #e7e9f0;border-radius:16px;background:#fff;box-shadow:0 8px 24px rgba(29,34,66,.05);text-align:left;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}.student-course-grid .student-course-card:hover{border-color:#cec9f5;background:#fff;box-shadow:0 15px 34px rgba(55,46,122,.11);transform:translateY(-4px)}.student-course-grid .student-course-cover{width:100%;height:auto;aspect-ratio:16/9;display:grid;place-items:center;border-radius:0;color:#fff;background:linear-gradient(135deg,#7567ef,#5143c7);background-position:center;background-size:cover;font-size:34px}.student-course-grid .student-course-cover.has-image{background-color:#eef0f5}.student-course-grid .student-course-cover i{font-style:normal}.student-course-grid .student-course-card-copy{min-height:66px;padding:18px 19px;display:block}.student-course-grid .student-course-card-copy strong{display:block;margin:0;overflow:hidden;color:#20263b;font-size:16px;font-weight:700;line-height:1.8;white-space:nowrap;text-overflow:ellipsis}.student-course-grid>.student-course-empty{grid-column:1/-1}.student-course-empty-state{min-height:390px;display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px dashed #dfe1e9;border-radius:16px;background:#fff}.student-course-empty-state>span{width:64px;height:64px;display:grid;place-items:center;border-radius:18px;color:#6656e8;background:#eeebff;font-size:25px}.student-course-empty-state h2{margin:18px 0 7px;color:#2b3145;font-size:18px}.student-course-empty-state p{margin:0;color:#8a90a0;font-size:12px}.student-course-empty-state button{margin-top:20px;padding:11px 18px;border-radius:9px;color:#fff;background:#6656e8;font-size:13px;font-weight:700}.student-course-detail-bar{min-height:58px;margin-bottom:14px;padding:0 4px;display:flex;align-items:center;gap:18px}.student-course-detail-bar button{padding:9px 13px;border:1px solid #dfe1e9;border-radius:9px;color:#596176;background:#fff;font-size:12px}.student-course-detail-bar button:hover{border-color:#c7c1f3;color:#6656e8}.student-course-detail-bar strong{font-size:16px}.student-course-detail-page .student-course-shell{display:grid;grid-template-columns:290px minmax(0,1fr);gap:14px}.student-course-detail-page .student-course-outline,.student-course-detail-page .student-lesson{grid-column:auto}
@media(max-width:1050px){.student-course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.student-course-detail-page .student-course-shell{grid-template-columns:250px minmax(0,1fr)}}@media(max-width:760px){.student-course-grid{grid-template-columns:1fr;gap:14px}.student-course-grid .student-course-card-copy{min-height:58px;padding:14px 16px}.student-course-detail-page .student-course-shell{grid-template-columns:1fr}.student-course-detail-page .student-course-outline{position:static;max-height:none}.student-course-detail-bar{align-items:flex-start;flex-direction:column;gap:10px}.student-course-empty-state{min-height:320px;padding:30px 18px}.student-course-empty-state h2{text-align:center;font-size:16px}}

/* Student course-first shell and three-module learning workspace. */
body{background:#fff}.sidebar{display:none!important}.main-shell{margin-left:0}.menu-button{display:none!important}.content{width:min(1440px,calc(100% - 48px));padding-top:24px}.student-course-detail-page{margin:-24px calc((100vw - min(1440px,calc(100vw - 48px)))/-2) -48px;background:#fff}.student-course-hero{height:200px;padding:25px max(28px,calc((100vw - 1380px)/2));position:relative;display:flex;align-items:center;gap:26px;overflow:hidden;color:#fff;background:linear-gradient(112deg,#202943,#3d4770 55%,#6656e8)}.student-course-hero:after{position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,rgba(17,22,43,.28),transparent 55%,rgba(102,86,232,.24));content:""}.student-course-hero>button{position:absolute;z-index:3;top:14px;left:max(28px,calc((100vw - 1380px)/2));padding:6px 10px;color:#e6e8f2;background:rgba(255,255,255,.1);font-size:11px}.student-course-hero-cover{width:240px;height:142px;position:relative;z-index:2;flex:0 0 auto;display:grid;place-items:center;overflow:hidden;background:linear-gradient(145deg,#7567ef,#5143c7);background-position:center;background-size:cover;box-shadow:0 12px 28px rgba(10,14,30,.24)}.student-course-hero-cover:after{position:absolute;inset:0;background:linear-gradient(180deg,transparent 45%,rgba(12,16,31,.58));content:""}.student-course-hero-cover span{position:relative;z-index:1;font-size:32px}.student-course-hero-cover.has-image span{display:none}.student-course-hero-copy{position:relative;z-index:2;max-width:720px}.student-course-hero-copy>span{color:#c8ccec;font-size:9px;font-weight:800;letter-spacing:.18em}.student-course-hero-copy h1{margin:7px 0 8px;font-size:27px}.student-course-hero-copy p{margin:0 0 16px;color:#d8dbea;font-size:12px;line-height:1.65}.student-course-total-progress{display:flex;align-items:center;gap:10px}.student-course-total-progress i{width:330px;height:7px;overflow:hidden;background:rgba(255,255,255,.22)}.student-course-total-progress u{height:100%;display:block;background:#fff;text-decoration:none}.student-course-total-progress strong{font-size:12px}.student-course-workspace{min-height:calc(100vh - 268px);display:grid;grid-template-columns:240px minmax(0,1fr);background:#fff}.student-course-module-nav{padding:26px 0;border-right:1px solid #e7e8ed;background:#fff}.student-course-module-nav button{width:100%;height:50px;padding:0 24px;position:relative;display:grid;grid-template-columns:26px 1fr auto;align-items:center;gap:10px;color:#606779;background:#fff;text-align:left;font-size:14px}.student-course-module-nav button:before{width:3px;position:absolute;inset:8px auto 8px 0;background:transparent;content:""}.student-course-module-nav button.active{color:#1f2538;font-weight:700}.student-course-module-nav button.active:before{background:#6656e8}.student-course-module-nav button:hover{color:#1f2538;background:#fff}.student-course-module-nav i{font-style:normal}.student-course-module-nav em{min-width:20px;height:20px;display:grid;place-items:center;border-radius:10px;color:#777e90;background:#f0f1f5;font-size:10px;font-style:normal}.student-course-module-content{min-width:0;padding:24px;background:#fff}.student-course-module{display:none}.student-course-module.active{display:block}.student-course-chapter-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:20px;align-items:start}.student-course-detail-page .student-course-outline{max-height:calc(100vh - 248px);position:sticky;top:92px;overflow:auto;border:1px solid #e6e7ec;border-radius:0;background:#fff;box-shadow:none}.student-outline-title{height:50px;padding:0 16px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #ededf1}.student-outline-title strong{font-size:14px}.student-outline-title small{color:#999;font-size:11px}.student-chapter-list{padding:14px 0}.student-chapter-list section+section{margin-top:18px}.student-chapter-list h3{margin:0;padding:8px 15px;gap:9px;color:#1a1a1a;font-size:15px;font-weight:700}.student-chapter-list h3 span{color:#888;font-size:12px}.student-section-link{min-height:42px;padding:7px 14px 7px 38px;grid-template-columns:42px minmax(0,1fr);gap:7px;border-radius:0;background:#fff}.student-section-link.level-2{padding-left:62px}.student-section-link:hover{background:#fff}.student-section-link.active{border-left:3px solid #6656e8;background:#f8f7ff}.student-section-link>i{width:auto;height:auto;display:block;color:#9298a7;background:transparent;font-size:11px}.student-section-link.active>i,.student-section-link.active strong{color:#493bc5}.student-section-link strong{color:#333;font-size:13px;font-weight:400}.student-section-link.level-2 strong{color:#666}.student-section-link small{font-size:10px}.student-section-link.locked{color:#aaa;opacity:.46}.student-course-detail-page .student-lesson{min-height:650px;padding:30px;border:1px solid #e6e7ec;border-radius:0;background:#fff;box-shadow:none}.student-lesson-head h1{font-size:26px}.student-lesson-meta{display:flex!important;align-items:center;gap:8px}.student-section-progress{margin-left:auto;display:flex;align-items:center;gap:8px}.student-section-progress i{width:120px;height:5px;overflow:hidden;background:#ececf2}.student-section-progress u{height:100%;display:block;background:#6656e8}.student-section-progress b{color:#6656e8;font-size:10px}.student-lesson-pagination{margin-top:14px;display:flex;justify-content:space-between}.student-lesson-pagination button{padding:9px 13px;border:1px solid #dedfe6;color:#4e566a;background:#fff}.student-lesson-pagination button:disabled{color:#bbb;cursor:not-allowed}.video-checkpoint{position:absolute;z-index:4;inset:0;display:grid;place-items:center;background:rgba(15,19,34,.82)}.video-checkpoint>div{width:min(420px,90%);padding:22px;color:#fff;background:#242b45}.video-checkpoint span{color:#8d82f5;font-size:10px}.video-checkpoint h3{margin:8px 0 15px}.video-checkpoint button{width:100%;margin-top:7px;padding:10px;color:#30374b;background:#fff}.video-checkpoint p{min-height:20px;margin:10px 0 0;color:#ffb5bd;font-size:11px}.media-block{position:relative}.course-module-heading{margin-bottom:20px}.course-module-heading>span{color:#6656e8;font-size:9px;font-weight:800;letter-spacing:.18em}.course-module-heading h2{margin:6px 0;font-size:23px}.course-module-heading p{color:#7d8393;font-size:12px}.course-homework-table{border:1px solid #e4e5ea}.course-homework-row{min-height:62px;padding:10px 16px;display:grid;grid-template-columns:minmax(210px,1.5fr) .7fr .8fr .65fr 85px;align-items:center;gap:14px;border-bottom:1px solid #ececf0;color:#62697b;font-size:12px}.course-homework-row:last-child{border:0}.course-homework-row.header{min-height:42px;color:#9297a4;background:#fafafa;font-size:11px}.course-homework-row strong{color:#252b3e;font-size:13px}.homework-type,.homework-status{display:inline-flex;padding:5px 8px;border-radius:4px;background:#f1f2f5;font-style:normal}.homework-status.blue{color:#3672c9;background:#edf5ff}.homework-status.green{color:#27815d;background:#eaf8f0}.homework-status.purple{color:#6656e8;background:#f0edff}.homework-status.red{color:#c74d5b;background:#fff0f2}.course-homework-row>button{padding:8px;color:#fff;background:#6656e8}.course-homework-row>button:disabled{color:#999;background:#eee;cursor:not-allowed}.course-module-back{margin-bottom:16px;padding:8px 11px;border:1px solid #dedfe6;background:#fff}.course-homework-answer{max-width:850px;padding:27px;border:1px solid #e3e4e9}.course-homework-answer>span{color:#6656e8;font-size:10px}.course-homework-answer h2{margin:7px 0}.course-homework-answer>p{color:#7b8292}.course-code-editor,.course-file-answer{margin:22px 0;display:flex;flex-direction:column;gap:8px}.course-code-editor textarea{min-height:300px;padding:18px;resize:vertical;border:0;outline:0;color:#d9e1f2;background:#1e2435;font:14px/1.8 ui-monospace,SFMono-Regular,Menlo,monospace}.course-file-answer{padding:25px;border:1px dashed #cfd2dc}.course-mock-quiz{margin:22px 0;display:flex;flex-direction:column;gap:10px}.discussion-heading{display:flex;align-items:flex-start;justify-content:space-between}.discussion-heading>button,.course-new-post button,.course-reply-box button{padding:9px 14px;color:#fff;background:#6656e8}.course-new-post{margin-bottom:18px;padding:16px;border:1px solid #e2e3e8}.course-new-post textarea,.course-reply-box textarea{width:100%;min-height:100px;padding:12px;resize:vertical;border:1px solid #dedfe5;outline:0}.course-new-post>div{margin-top:10px;display:flex;align-items:center;justify-content:space-between}.course-new-post label{color:#646b7d;font-size:11px}.course-new-post input{display:none}.course-discussion-list{display:flex;flex-direction:column;gap:12px}.course-discussion-post{position:relative;padding:18px;border:1px solid #e5e6eb;background:#fff}.course-discussion-post.pinned{border-color:#d8d3f8;background:#fcfbff}.discussion-pin{position:absolute;right:16px;top:15px;padding:4px 7px;color:#6656e8;background:#eeebff;font-size:10px}.discussion-author{display:flex;align-items:center;gap:10px}.discussion-author>i{width:38px;height:38px;display:grid;place-items:center;border-radius:50%;color:#fff;background:linear-gradient(145deg,#64cec9,#6656e8);font-style:normal}.discussion-author>span{display:flex;flex-direction:column}.discussion-author strong{font-size:12px}.discussion-author small{margin-top:3px;color:#989da9;font-size:10px}.course-discussion-post>p{margin:13px 0;color:#454c5e;font-size:13px;line-height:1.8}.course-discussion-post footer{display:flex;justify-content:flex-end;gap:8px}.course-discussion-post footer button{padding:6px 9px;color:#777e8f;background:#f5f5f7;font-size:11px}.course-discussion-post footer button.liked{color:#d95568}.course-discussion-detail{max-width:900px}.course-discussion-detail>h3{margin-top:25px}.course-reply-list p{padding:13px;border-bottom:1px solid #eee;font-size:12px}.course-reply-box{margin-top:18px}.course-reply-box button{margin-top:8px}
@media(max-width:1150px){.student-course-chapter-layout{grid-template-columns:250px minmax(0,1fr)}.course-homework-row{grid-template-columns:minmax(180px,1.3fr) .7fr .8fr .7fr 75px}}@media(max-width:900px){.student-course-workspace{grid-template-columns:76px minmax(0,1fr)}.student-course-module-nav button{padding:0;display:flex;justify-content:center}.student-course-module-nav button span,.student-course-module-nav button em{display:none}.student-course-chapter-layout{grid-template-columns:1fr}.student-course-detail-page .student-course-outline{max-height:none;position:static}.student-course-hero-cover{width:190px}.course-homework-table{overflow:auto}.course-homework-row{min-width:780px}}@media(max-width:650px){.content{width:100%;padding-inline:12px}.student-course-detail-page{margin-inline:-12px}.student-course-hero{height:auto;min-height:270px;padding:58px 18px 20px;align-items:flex-start;flex-direction:column}.student-course-hero>button{left:18px}.student-course-hero-cover{width:150px;height:90px}.student-course-hero-copy h1{font-size:22px}.student-course-total-progress i{width:210px}.student-course-workspace{grid-template-columns:1fr}.student-course-module-nav{padding:0;display:grid;grid-template-columns:repeat(3,1fr);border-right:0;border-bottom:1px solid #e7e8ed}.student-course-module-nav button{height:48px;display:flex}.student-course-module-nav button span{display:block}.student-course-module-nav button:before{inset:auto 12px 0;height:3px;width:auto}.student-course-module-content{padding:12px}.student-course-detail-page .student-lesson{padding:18px}.student-lesson-meta{align-items:flex-start!important;flex-wrap:wrap}.student-section-progress{width:100%;margin-left:0}.discussion-heading{gap:12px;flex-direction:column}}

/* Minimal student course detail: one slim header, 200px course navigation, clean content. */
body.student-course-detail-active .topbar{display:none}
body.student-course-detail-active .content{width:100%;padding:0}
body.student-course-detail-active .student-course-detail-page{margin:0}

/* Course AI teaching agent */
.student-course-module-content:has([data-course-module-panel="agent"].active){padding:0;overflow:hidden}
.course-agent-nav-icon{color:#6252df!important;font-size:17px!important;font-style:normal}
.agent-live-dot{min-width:26px!important;padding:0 6px;color:#fff!important;background:linear-gradient(135deg,#7162eb,#4e9cf3)!important;font-size:8px!important;letter-spacing:.06em}
.course-agent-shell{height:calc(100vh - 64px);height:calc(100dvh - 64px);min-height:0;display:grid;grid-template-columns:minmax(360px,42%) minmax(520px,58%);overflow:hidden;background:#f6f7fb}
.course-agent-chat{min-width:0;min-height:0;display:grid;grid-template-rows:auto minmax(0,1fr) auto auto;overflow:hidden;border-right:1px solid #e2e4ec;background:#fff}
.course-agent-chat-head{height:48px;min-height:48px;padding:0 16px;display:flex;align-items:center;border-bottom:1px solid #ebecef;background:#fff}
.course-agent-chat-status{width:100%;min-width:0;display:flex;align-items:center;justify-content:space-between;gap:12px}
.course-agent-status-left{display:flex;align-items:center;gap:8px;min-width:0}
.course-agent-status-avatar{width:28px;height:28px;flex:0 0 auto;display:grid;place-items:center;border-radius:8px;color:#fff;background:linear-gradient(145deg,#6366f1,#8b5cf6);font-size:13px}
.course-agent-status-name{flex:0 0 auto;color:#1f2538;font-size:14px;font-weight:500;white-space:nowrap}
.course-agent-status-dot{width:8px;height:8px;flex:0 0 auto;border-radius:50%;background:#22c55e;box-shadow:0 0 0 2px rgba(34,197,94,.15)}
.course-agent-status-mode{overflow:hidden;color:#8c91a1;font-size:11px;white-space:nowrap;text-overflow:ellipsis}
.agent-canvas-head>div>span{color:#7365e4;font-size:8px;font-weight:800;letter-spacing:.14em}.agent-canvas-head h2{margin:3px 0 2px;color:#252a3c;font-size:15px}
.course-agent-messages{min-height:0;padding:19px 17px;overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain;scrollbar-gutter:stable;scroll-behavior:smooth}.course-agent-message{margin-bottom:18px;display:flex;align-items:flex-start;gap:9px}.course-agent-message>div{width:32px;height:32px;flex:0 0 auto;display:grid;place-items:center;border-radius:10px;color:#fff;background:linear-gradient(145deg,#7263e9,#5299ee);font-size:12px}.course-agent-message>section{max-width:calc(100% - 42px)}.course-agent-message p{margin:0;padding:11px 13px;border-radius:4px 13px 13px 13px;color:#41485b;background:#f4f5f8;font-size:11px;line-height:1.75}.course-agent-message.user{justify-content:flex-start;flex-direction:row-reverse}.course-agent-message.user>div{background:#262d43}.course-agent-message.user>p{max-width:78%;border-radius:13px 4px 13px 13px;color:#fff;background:#262d43}.course-agent-message.welcome section>small,.learning-summary-message section>small{display:block;margin-bottom:6px;color:#7062df;font-size:8px;font-weight:750}.learning-summary-message section>button{margin-top:7px;color:#6253df;background:transparent;font-size:9px}
.agent-reasoning{margin:0 0 7px;padding:8px 10px;border:1px solid #e3e5ee;border-radius:9px;background:#fbfbfd}.agent-reasoning summary{display:flex;align-items:center;gap:6px;color:#747b8e;cursor:pointer;font-size:8px;list-style:none}.agent-reasoning summary::-webkit-details-marker{display:none}.agent-reasoning summary i,.agent-status-badge i{width:6px;height:6px;border-radius:50%;background:#39b886;box-shadow:0 0 0 3px rgba(57,184,134,.12)}.agent-reasoning>div{margin-top:7px;display:flex;flex-direction:column;gap:4px}.agent-reasoning>div span{display:flex;align-items:center;gap:6px;color:#7d8394;font-size:8px}.agent-reasoning b{color:#35a97c}
.agent-citations{margin-top:7px;display:flex;flex-wrap:wrap;align-items:center;gap:5px}.agent-citations>span{color:#999ead;font-size:8px}.agent-citations button{padding:5px 7px;border:1px solid #e1e3ec;border-radius:6px;color:#5c65a8;background:#fff;font-size:8px}.agent-citations button:hover{border-color:#a9a1ec;color:#5546cf}
.agent-tool-launch{width:100%;margin-top:9px;padding:10px;display:grid;grid-template-columns:32px 1fr auto;align-items:center;gap:9px;border:1px solid #dcd8fa;border-radius:10px;background:linear-gradient(135deg,#faf9ff,#f4f8ff);text-align:left}.agent-tool-launch>span{width:32px;height:32px;display:grid;place-items:center;border-radius:9px;color:#fff;background:#6556e3}.agent-tool-launch>div{display:flex;min-width:0;flex-direction:column}.agent-tool-launch strong{color:#343a4e;font-size:10px}.agent-tool-launch small{margin-top:3px;color:#8d92a1;font-size:8px}.agent-tool-launch>b{color:#6556e3}
.course-agent-loading,.course-agent-thinking,.course-agent-error{min-height:50px;display:flex;align-items:center;justify-content:center;gap:8px;color:#858b9c;font-size:9px}.course-agent-loading i,.course-agent-thinking i{width:15px;height:15px;border:2px solid #dedbef;border-top-color:#6656e8;border-radius:50%;animation:agent-spin .8s linear infinite}.course-agent-thinking{justify-content:flex-start;padding:0 36px 16px}.course-agent-error{height:100%;flex-direction:column}.course-agent-error button{padding:7px 10px;color:#fff;background:#6656e8}@keyframes agent-spin{to{transform:rotate(360deg)}}
.course-agent-suggestions{padding:8px 14px;display:flex;overflow-x:auto;gap:6px;border-top:1px solid #f0f0f3}.course-agent-suggestions button{padding:5px 12px;flex:0 0 auto;border:1px solid #e5e6eb;border-radius:6px;color:#6b7280;background:#f6f7f9;font-size:12px;white-space:nowrap;transition:border-color .15s,color .15s,background .15s}.course-agent-suggestions button:hover{border-color:#c7cbda;color:#3f4654;background:#f0f1f4}
.course-agent-input{margin:0 14px 14px;padding:7px 7px 7px 12px;display:flex;align-items:flex-end;gap:8px;border:1px solid #dcdde5;border-radius:12px;background:#fff;box-shadow:0 7px 20px rgba(33,40,72,.06)}.course-agent-input:focus-within{border-color:#8e84e9;box-shadow:0 7px 24px rgba(79,65,184,.11)}.course-agent-input textarea{min-height:34px;max-height:120px;flex:1;padding:8px 0;resize:none;border:0;outline:0;color:#343a4d;background:transparent;font:10px/1.6 inherit}.course-agent-input>button{height:34px;padding:0 11px;border-radius:8px;color:#fff;background:linear-gradient(135deg,#6d5ee8,#4d83e6);font-size:9px;font-weight:700}.course-agent-input>button:disabled{opacity:.55}
.course-agent-canvas{min-width:0;min-height:0;display:grid;grid-template-rows:auto minmax(0,1fr);overflow:hidden;background:#f6f7fb}.agent-canvas-head{height:76px;padding:0 22px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e4e6ec;background:rgba(255,255,255,.84)}.agent-status-badge{padding:6px 9px;display:flex;align-items:center;gap:7px;border:1px solid #dfe7e4;border-radius:16px;color:#467264;background:#f8fffc;font-size:8px}.agent-canvas-body{min-height:0;padding:22px;overflow-x:hidden;overflow-y:auto;overscroll-behavior:contain;scrollbar-gutter:stable}
.agent-canvas-overview{max-width:780px;margin:auto;display:grid;grid-template-columns:1fr 1fr;gap:14px}.agent-goal-card,.agent-mastery-card,.agent-path-card{padding:19px;border:1px solid #e1e3ea;border-radius:14px;background:#fff;box-shadow:0 8px 22px rgba(38,44,71,.04)}.agent-goal-card{grid-column:1/-1;position:relative;overflow:hidden;background:linear-gradient(135deg,#282f4a,#4a4e82)}.agent-goal-card:after{width:150px;height:150px;position:absolute;right:-35px;top:-60px;border:28px solid rgba(255,255,255,.06);border-radius:50%;content:""}.agent-goal-card span,.agent-path-card header>span{color:#9fa6bc;font-size:8px;font-weight:750;letter-spacing:.08em}.agent-goal-card h3{max-width:75%;margin:8px 0;color:#fff;font-size:18px;line-height:1.5}.agent-goal-card p{margin:0;color:#c7cbd9;font-size:9px}.agent-mastery-card>div{display:flex;align-items:flex-end;justify-content:space-between}.agent-mastery-card span{color:#767d8f;font-size:9px}.agent-mastery-card strong{color:#5f50da;font-size:25px}.agent-mastery-card>i{height:7px;margin:17px 0 9px;display:block;overflow:hidden;border-radius:5px;background:#eeedf4}.agent-mastery-card>i u{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,#6859e6,#54a4ec);transition:width .4s}.agent-mastery-card>small{color:#989dab;font-size:8px}.agent-path-card header{display:flex;justify-content:space-between}.agent-path-card header small{color:#a0a4af;font-size:7px}.agent-path-card>div{margin-top:12px}.agent-path-card article{padding:8px 0;display:flex;align-items:center;gap:9px;border-bottom:1px solid #f0f1f4}.agent-path-card article:last-child{border:0}.agent-path-card article>i{width:25px;height:25px;display:grid;place-items:center;border-radius:8px;color:#9096a5;background:#f0f1f4;font-size:7px;font-style:normal}.agent-path-card article.completed>i{color:#25805e;background:#e6f7ef}.agent-path-card article.current>i{color:#fff;background:#6656e8}.agent-path-card article>div{display:flex;flex-direction:column}.agent-path-card strong{font-size:8px}.agent-path-card article small{margin-top:2px;color:#999eab;font-size:7px}
.agent-algorithm-lab{max-width:900px;margin:auto;border:1px solid #dfe1e9;border-radius:15px;background:#fff;box-shadow:0 14px 38px rgba(34,41,70,.07)}.agent-algorithm-lab>header{padding:18px 20px;display:flex;align-items:flex-start;border-bottom:1px solid #e9eaf0}.agent-algorithm-lab>header>div{flex:1}.agent-algorithm-lab>header span,.agent-algorithm-checkpoint>span,.agent-learning-summary>span{color:#6858df;font-size:8px;font-weight:800;letter-spacing:.14em}.agent-algorithm-lab>header h2{margin:6px 0;font-size:18px}.agent-algorithm-lab>header p{margin:0;color:#858b9a;font-size:9px}.agent-algorithm-lab>header button{width:28px;height:28px;color:#8b91a0;background:#f1f2f5;font-size:15px}.agent-algorithm-input{padding:10px 20px;display:flex;align-items:flex-end;gap:8px;border-bottom:1px solid #eeeeF2;background:#fafafd}.agent-algorithm-input label{flex:1;display:flex;flex-direction:column;gap:5px;color:#777e90;font-size:8px}.agent-algorithm-input input{height:32px;padding:0 10px;border:1px solid #dedfe6;background:#fff}.agent-algorithm-input button{height:32px;padding:0 10px;color:#5f50d9;background:#eeebff;font-size:8px}
.agent-algorithm-stage{padding:18px 20px 0}.agent-algorithm-bars{height:250px;padding:28px 22px 0;display:flex;align-items:end;justify-content:center;gap:10px;border-radius:11px;background:repeating-linear-gradient(0deg,#20263d,#20263d 49px,#2b314a 50px)}.agent-algorithm-bars i{min-width:28px;max-width:64px;position:relative;flex:1;border-radius:7px 7px 2px 2px;background:linear-gradient(#7466ec,#5547c8);transition:height .28s,background .2s,transform .2s}.agent-algorithm-bars i.active{background:linear-gradient(#ffcf75,#ef9340);transform:translateY(-5px)}.agent-algorithm-bars b{position:absolute;left:50%;top:-21px;color:#fff;font-size:9px;transform:translateX(-50%)}.agent-algorithm-bars small{position:absolute;left:50%;bottom:-18px;color:#8990a8;font-size:7px;transform:translateX(-50%)}.agent-algorithm-step{min-height:48px;padding:11px 3px;display:flex;align-items:center;justify-content:space-between}.agent-algorithm-step b{color:#40475a;font-size:9px}.agent-algorithm-step span{color:#999eab;font-size:8px}
.agent-algorithm-detail{display:grid;grid-template-columns:1.15fr .85fr;border-top:1px solid #eaebef;border-bottom:1px solid #eaebef}.agent-algorithm-detail>section{min-width:0;padding:14px 18px}.agent-algorithm-detail>section+section{border-left:1px solid #eaebef}.agent-algorithm-detail header{margin-bottom:9px;color:#777e8f;font-size:8px;font-weight:750}.agent-algorithm-detail ol{margin:0;padding:0;counter-reset:line;list-style:none}.agent-algorithm-detail li{padding:4px 8px 4px 28px;position:relative;border-radius:5px;color:#778095;font:8px/1.45 ui-monospace,SFMono-Regular,Menlo,monospace}.agent-algorithm-detail li:before{position:absolute;left:9px;color:#b5bac7;counter-increment:line;content:counter(line)}.agent-algorithm-detail li.active{color:#fff;background:#6656e8}.agent-algorithm-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}.agent-algorithm-metrics span{padding:9px 5px;display:flex;align-items:center;flex-direction:column;border-radius:8px;background:#f5f6f9}.agent-algorithm-metrics small{color:#969baa;font-size:6px}.agent-algorithm-metrics b{margin-top:4px;color:#4c5366;font-size:13px}
.agent-algorithm-controls{padding:12px 18px;display:flex;justify-content:flex-end;gap:7px}.agent-algorithm-controls button{padding:8px 11px;border:1px solid #dedfe6;color:#666d7e;background:#fff;font-size:8px}.agent-algorithm-controls button.primary{border-color:#6656e8;color:#fff;background:#6656e8}.agent-algorithm-controls button:disabled{opacity:.45}
.agent-algorithm-checkpoint{margin:0 18px 18px;padding:17px;border:1px solid #ddd8fa;border-radius:11px;background:#faf9ff}.agent-algorithm-checkpoint[hidden]{display:none}.agent-algorithm-checkpoint h3{margin:7px 0 12px;font-size:12px}.agent-algorithm-checkpoint>div{display:grid;grid-template-columns:1fr 1fr;gap:7px}.agent-algorithm-checkpoint label{padding:9px;display:flex;align-items:center;gap:8px;border:1px solid #e0e1e8;border-radius:7px;background:#fff;font-size:9px}.agent-algorithm-checkpoint label:has(input:checked){border-color:#6656e8;background:#f1efff}.agent-algorithm-checkpoint input{display:none}.agent-algorithm-checkpoint label i{width:20px;height:20px;display:grid;place-items:center;border-radius:5px;color:#6c7385;background:#f0f1f5;font-size:7px;font-style:normal}.agent-algorithm-checkpoint>button{margin-top:11px;padding:9px 12px;color:#fff;background:#6656e8;font-size:8px}
.agent-concept-lab{overflow:hidden}.concept-step-bar{min-height:48px;padding:11px 20px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid #eceef4;background:#fafafd}.concept-step-bar b{color:#3f4659;font-size:9px}.concept-step-bar span{color:#8c92a2;font-size:8px}.concept-code-list li{transition:color .2s,background .2s}.concept-metric-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.concept-metric-row span{padding:10px 7px;display:flex;flex-direction:column;align-items:center;border-radius:9px;background:#f4f5f8}.concept-metric-row small{color:#9298a8;font-size:7px}.concept-metric-row b{margin-top:5px;color:#5145bd;font-size:14px}.concept-detail p{min-height:30px;margin:0 0 10px;color:#697184;font-size:9px;line-height:1.6}
.neural-network-stage{min-height:280px;padding:22px 20px;display:grid;grid-template-columns:minmax(105px,1fr) minmax(55px,.65fr) minmax(105px,1fr) minmax(55px,.65fr) minmax(105px,1fr);align-items:stretch;background:radial-gradient(circle at 50% 45%,#f2f0ff 0,#fafbfe 48%,#f6f8fc 100%)}.network-layer{padding:11px;display:flex;position:relative;z-index:2;flex-direction:column;justify-content:center;gap:10px;border:1px solid #e1e4ee;border-radius:13px;background:rgba(255,255,255,.82);transition:border-color .25s,box-shadow .25s,transform .25s}.network-layer>header{position:absolute;left:0;right:0;top:-16px;color:#838a9c;font-size:7px;font-weight:800;text-align:center;letter-spacing:.08em}.network-layer.active{border-color:#796be7;box-shadow:0 9px 25px rgba(92,75,206,.16);transform:translateY(-3px)}.network-layer.completed{border-color:#a9dcca}.network-node{padding:10px 6px;display:flex;align-items:center;justify-content:space-between;gap:5px;border-radius:9px;color:#555d70;background:#f1f3f8;transition:background .25s,box-shadow .25s,transform .25s}.network-layer.active .network-node{color:#fff;background:linear-gradient(135deg,#7566e8,#566fd8);box-shadow:0 6px 14px rgba(91,76,205,.2);transform:scale(1.03)}.network-layer.completed .network-node{background:#e9f8f2}.network-node b{font-size:10px}.network-node span{font-size:7px}.network-output{padding:8px;border-radius:9px;background:#f3f4f8}.network-output>span{display:block;color:#596174;font-size:8px;font-weight:750}.network-output>i{height:6px;margin:7px 0 5px;display:block;overflow:hidden;border-radius:5px;background:#e0e2e9}.network-output u{height:100%;display:block;border-radius:inherit;background:linear-gradient(90deg,#6556e3,#45a7ef);transition:width .5s}.network-output>b{display:block;color:#5145be;font-size:11px;text-align:right}.neural-connections{width:100%;height:100%;overflow:visible}.neural-connections path{fill:none;stroke:#d7d9e7;stroke-width:var(--edge-width);vector-effect:non-scaling-stroke;transition:stroke .25s,opacity .25s;opacity:.55}.neural-connections.active path{stroke:#6d5ee2;stroke-dasharray:8 7;opacity:.9;animation:neural-signal .9s linear infinite;animation-delay:var(--edge-delay)}@keyframes neural-signal{to{stroke-dashoffset:-30}}
.loop-stage{padding:24px 20px;display:grid;grid-template-columns:minmax(0,1.35fr) minmax(190px,.65fr);gap:18px;background:linear-gradient(145deg,#f8f9fd,#f2f0ff)}.loop-values{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:9px}.loop-values i{width:58px;height:62px;display:flex;align-items:center;justify-content:center;position:relative;flex-direction:column;border:1px solid #dfe2eb;border-radius:11px;color:#545c70;background:#fff;font-style:normal;transition:transform .25s,border-color .25s,background .25s,box-shadow .25s}.loop-values i.active{border-color:#6758df;color:#fff;background:linear-gradient(145deg,#7666e9,#594acb);box-shadow:0 9px 20px rgba(87,70,193,.2);transform:translateY(-6px)}.loop-values i.completed:not(.active){border-color:#a8ddc9;background:#edf9f4}.loop-values b{font-size:17px}.loop-values small{margin-top:5px;font-size:7px}.loop-variable-panel{padding:15px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:8px;border-radius:13px;color:#fff;background:#252c45}.loop-variable-panel>span{display:flex;flex-direction:column;align-items:center}.loop-variable-panel small{color:#aeb4c8;font-size:7px}.loop-variable-panel b{margin-top:7px;font-size:21px}.loop-variable-panel>strong{color:#8b80e9}
.recursion-stage{min-height:265px;padding:20px;display:grid;grid-template-columns:minmax(240px,1.2fr) minmax(175px,.8fr);gap:18px;background:linear-gradient(145deg,#f8f9fd,#f3f1ff)}.recursion-stage>section{padding:14px;border:1px solid #e0e3ec;border-radius:13px;background:#fff}.recursion-stage>section>header{margin-bottom:10px;color:#7c8395;font-size:8px;font-weight:750}.recursion-stage>section>div{min-height:190px;display:flex;flex-direction:column;justify-content:flex-end;gap:6px}.recursion-stage>section p{margin:auto;color:#a0a5b1;font-size:9px}.recursion-stage article{padding:9px 11px;display:flex;align-items:center;justify-content:space-between;border-left:3px solid #b9b4ec;border-radius:7px;background:#f2f2fa;animation:stack-frame-in .25s ease-out}.recursion-stage article.active{border-color:#6656e8;color:#fff;background:linear-gradient(135deg,#7061e4,#5547c5)}.recursion-stage article b{font-size:9px}.recursion-stage article span{font-size:7px}.recursion-stage>aside{padding:20px;display:flex;align-items:center;justify-content:center;flex-direction:column;border-radius:13px;color:#fff;background:#262d47;text-align:center}.recursion-stage>aside span{color:#adb3c8;font-size:8px}.recursion-stage>aside strong{margin:13px 0;color:#85e1bd;font-size:33px}.recursion-stage>aside p{margin:0;color:#bfc4d3;font-size:8px;line-height:1.7}@keyframes stack-frame-in{from{opacity:0;transform:translateY(-8px)}}
.agent-learning-summary{max-width:700px;margin:auto;padding:30px;border:1px solid #dfe2e8;border-radius:15px;background:#fff;text-align:center;box-shadow:0 15px 38px rgba(31,38,68,.07)}.agent-summary-mark{width:58px;height:58px;margin:0 auto 13px;display:grid;place-items:center;border-radius:18px;color:#fff;background:linear-gradient(145deg,#42bf8b,#279b72);font-size:23px}.agent-learning-summary.review .agent-summary-mark{background:linear-gradient(145deg,#f4ac56,#dc7b42)}.agent-learning-summary h2{margin:8px 0;font-size:19px}.agent-learning-summary>p{margin:0 auto;color:#777e90;font-size:10px;line-height:1.7}.agent-summary-mastery{margin:20px 0;padding:15px;border-radius:10px;background:#f7f7fa;text-align:left}.agent-summary-mastery>div{display:flex;align-items:center;justify-content:space-between}.agent-summary-mastery small{color:#858b9b;font-size:8px}.agent-summary-mastery strong{color:#5f50d9;font-size:16px}.agent-summary-mastery strong i{margin:0 5px;color:#a0a5b2;font-style:normal}.agent-summary-mastery>span{height:6px;margin-top:10px;display:block;overflow:hidden;border-radius:4px;background:#e7e7ee}.agent-summary-mastery>span i{height:100%;display:block;background:linear-gradient(90deg,#6656e8,#4ea5ed)}.agent-summary-items,.agent-summary-next{text-align:left}.agent-summary-items h3{font-size:9px}.agent-summary-items p{margin:6px 0;color:#5f6678;font-size:9px}.agent-summary-items p i{margin-right:6px;color:#2eaa7c;font-style:normal}.agent-summary-next{margin-top:15px;padding:12px;border-left:3px solid #6656e8;background:#f8f7ff}.agent-summary-next span{color:#6656e8;font-size:8px;font-weight:750}.agent-summary-next p{margin:5px 0 0;color:#5d6476;font-size:9px}.agent-summary-actions{margin-top:18px;display:flex;justify-content:center;gap:8px}.agent-summary-actions button{padding:9px 12px;border:1px solid #dedfe6;color:#606778;background:#fff;font-size:8px}.agent-summary-actions button.primary{border-color:#6656e8;color:#fff;background:#6656e8}
.agent-report-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.agent-report-grid>section{padding:22px;border:1px solid #e1e3e9;background:#fff}.agent-report-grid span{color:#808697;font-size:9px}.agent-report-grid strong{display:block;margin:9px 0;color:#5e4fd8;font-size:30px}.agent-report-grid i{height:7px;display:block;background:#ececf2}.agent-report-grid i u{height:100%;display:block;background:#6656e8}.agent-report-grid small{display:block;margin-top:9px;color:#999eaa;font-size:8px}.agent-report-grid h3{min-height:50px;margin:10px 0;font-size:16px;line-height:1.5}.agent-report-grid button{padding:8px 10px;color:#fff;background:#6656e8;font-size:8px}.agent-report-history{margin-top:16px;padding:20px;border:1px solid #e1e3e9}.agent-report-history>h3{margin:0 0 12px}.agent-report-history article{padding:11px 0;display:flex;gap:10px;border-top:1px solid #eee}.agent-report-history article>i{width:28px;height:28px;display:grid;place-items:center;border-radius:8px;color:#26805e;background:#e8f7f0;font-style:normal}.agent-report-history article>div{display:flex;flex-direction:column}.agent-report-history article strong{font-size:9px}.agent-report-history article p{margin:4px 0;color:#72798b;font-size:9px}.agent-report-history article small{color:#6556dd;font-size:8px}
@media(max-width:1180px){.course-agent-shell{grid-template-columns:minmax(340px,44%) minmax(460px,56%)}.agent-algorithm-bars{height:220px}.agent-canvas-body{padding:15px}}
@media(max-width:900px){.course-agent-shell{height:auto;min-height:0;grid-template-columns:1fr;overflow:visible}.course-agent-chat{height:min(720px,calc(100dvh - 64px));min-height:560px;border-right:0;border-bottom:1px solid #e2e4ec}.course-agent-canvas{min-height:650px;overflow:visible}.agent-canvas-body{overflow:visible}.student-course-module-content:has([data-course-module-panel="agent"].active){overflow:visible}}
@media(max-width:650px){.course-agent-shell{min-height:0}.course-agent-chat{min-height:calc(100vh - 122px)}.course-agent-canvas{min-height:560px}.agent-canvas-body{padding:10px}.agent-canvas-overview,.agent-report-grid{grid-template-columns:1fr}.agent-goal-card{grid-column:auto}.agent-algorithm-detail{grid-template-columns:1fr}.agent-algorithm-detail>section+section{border-left:0;border-top:1px solid #eaebef}.agent-algorithm-checkpoint>div{grid-template-columns:1fr}.agent-algorithm-bars{height:190px;gap:5px}.agent-learning-summary{padding:20px}.agent-summary-actions{flex-direction:column}.neural-network-stage{padding:27px 10px 18px;grid-template-columns:minmax(80px,1fr) 28px minmax(80px,1fr) 28px minmax(80px,1fr)}.network-layer{padding:6px}.network-node{padding:8px 5px;flex-direction:column}.network-node span{font-size:6px}.loop-stage,.recursion-stage{grid-template-columns:1fr}.loop-variable-panel{min-height:100px}.recursion-stage>section>div{min-height:160px}}
.student-course-minimal-header{height:64px;padding:0 24px;display:flex;align-items:center;gap:22px;border-bottom:1px solid #e8e9ee;background:#fff}
.student-course-minimal-header button{padding:7px 10px;border:1px solid #e2e3e9;border-radius:5px;color:#737a8b;background:#fff;font-size:12px}
.student-course-minimal-header button:hover{border-color:#bdb6f1;color:#594acb}
.student-course-minimal-header h1{margin:0;color:#1f2537;font-size:18px;font-weight:700}
.student-course-workspace{min-height:calc(100vh - 64px);grid-template-columns:200px minmax(0,1fr)}
.student-course-module-nav{padding:0;border-right:1px solid #e8e9ee}
.student-course-module-nav h2{min-height:82px;margin:0;padding:22px 20px;display:flex;align-items:center;border-bottom:1px solid #eeeeF2;color:#22283a;font-size:15px;font-weight:700;line-height:1.55}
.student-course-module-nav button{height:48px;padding:0 18px;grid-template-columns:22px 1fr auto;gap:8px;font-size:13px}
.student-course-module-nav button:before{inset:7px auto 7px 0;width:3px}
.student-course-module-nav button.active:before{background:#6656e8}
.student-course-module-content{padding:22px}
.student-course-chapter-layout{grid-template-columns:286px minmax(0,1fr);gap:18px}
.student-course-detail-page .student-course-outline{top:18px;max-height:calc(100vh - 108px)}
.student-chapter-list{padding:10px 0}
.student-chapter-list section+section{margin-top:10px}
.student-chapter-toggle{width:100%;min-height:40px;padding:8px 14px;display:grid;grid-template-columns:14px minmax(0,1fr);align-items:center;gap:7px;color:#1a1a1a;background:#fff;text-align:left}
.student-chapter-toggle:hover{color:#4e43ba;background:#fff}
.student-chapter-toggle>span{color:#9a9eaa;font-size:9px;transition:transform .18s}
.student-chapter-toggle>b{min-width:0;display:flex;align-items:center;gap:8px;font-size:14px;line-height:1.45}
.student-chapter-toggle b i{color:#8a8f9c;font-size:11px;font-style:normal;font-weight:600}
.student-chapter-list section.collapsed .student-chapter-toggle>span{transform:rotate(-90deg)}
.student-chapter-list section.collapsed .student-chapter-children{display:none}
.student-chapter-children{display:block}
.student-section-link{padding-left:35px;background:#fff}
.student-section-link.level-2{padding-left:55px}
.student-section-link.active{border-left:3px solid #6656e8;background:#faf9ff}
.student-course-detail-page .student-lesson{min-height:calc(100vh - 108px);padding:28px}
.course-homework-groups{display:flex;flex-direction:column;gap:28px}
.course-homework-group>header{margin-bottom:9px;display:flex;align-items:center;justify-content:space-between}
.course-homework-group>header h3{margin:0;color:#252b3e;font-size:15px}
.course-homework-group>header span{color:#999eaa;font-size:11px}
.course-homework-group>div{border-top:1px solid #e5e6eb}
.course-homework-card{min-height:76px;padding:13px 14px;display:grid;grid-template-columns:82px minmax(180px,1fr) 76px 78px;align-items:center;gap:14px;border-bottom:1px solid #e8e9ed;background:#fff}
.course-homework-card>div strong{display:block;color:#252b3e;font-size:13px}
.course-homework-card>div p{margin:5px 0 0;color:#9297a4;font-size:11px}
.course-homework-card>button{padding:8px;border-radius:4px;color:#fff;background:#6656e8;font-size:11px}
.course-homework-card>button:disabled{color:#999;background:#eee;cursor:not-allowed}

@media(max-width:1050px){
    .student-course-chapter-layout{grid-template-columns:240px minmax(0,1fr)}
}
@media(max-width:800px){
    .student-course-workspace{grid-template-columns:72px minmax(0,1fr)}
    .student-course-module-nav h2{display:none}
    .student-course-module-nav button{padding:0;display:flex;justify-content:center}
    .student-course-module-nav button span,.student-course-module-nav button em{display:none}
    .student-course-chapter-layout{grid-template-columns:1fr}
    .student-course-detail-page .student-course-outline{max-height:none;position:static}
    .course-homework-card{grid-template-columns:74px minmax(150px,1fr) 72px}
    .course-homework-card>button{grid-column:2/-1;justify-self:end}
}
@media(max-width:600px){
    .student-course-minimal-header{height:58px;padding:0 12px;gap:10px}
    .student-course-minimal-header h1{font-size:15px}
    .student-course-workspace{grid-template-columns:1fr}
    .student-course-module-nav{display:grid;grid-template-columns:repeat(3,1fr);border-right:0;border-bottom:1px solid #e8e9ee}
    .student-course-module-nav button{height:44px}
    .student-course-module-nav button span{display:block}
    .student-course-module-nav button:before{width:auto;height:3px;inset:auto 16px 0}
    .student-course-module-content{padding:12px}
    .student-course-detail-page .student-lesson{padding:18px}
    .course-homework-card{grid-template-columns:1fr auto;gap:8px}
    .course-homework-card>.homework-type{justify-self:start}
    .course-homework-card>div{grid-column:1/-1}
    .course-homework-card>button{grid-column:auto;justify-self:end}
}

/* Student course detail · Chaoxing-inspired sidebar and lesson workspace. */
.student-course-minimal-header{
    height:64px;
    padding:0 22px 0 18px;
    gap:20px;
    border-bottom:1px solid #e8e8e8;
}
.student-course-site-brand{
    width:182px;
    flex:0 0 182px;
    display:flex;
    align-items:center;
    gap:10px;
    color:#172033;
}
.student-course-site-brand .brand-mark{width:28px;height:28px}
.student-course-site-brand strong{font-size:16px;letter-spacing:.04em}
.student-course-minimal-header h1{
    min-width:0;
    flex:1;
    overflow:hidden;
    font-size:16px;
    white-space:nowrap;
    text-overflow:ellipsis;
}
.student-course-minimal-header>button{order:3;flex:0 0 auto}
.student-course-workspace{
    grid-template-columns:220px minmax(0,1fr);
    background:#fff;
}
.student-course-module-nav{
    min-height:calc(100vh - 64px);
    padding:0;
    display:flex;
    flex-direction:column;
    border-right:1px solid #e8e8e8;
    background:#f8f9fa;
}
.student-course-sidebar-menu{flex:0 1 auto;overflow-y:auto}
.student-course-sidebar-info{
    padding:24px 20px 20px;
    border-bottom:1px solid #e8e8e8;
}
.student-course-sidebar-cover{
    width:100px;
    height:70px;
    margin-bottom:13px;
    display:grid;
    place-items:center;
    overflow:hidden;
    border-radius:4px;
    color:#fff;
    background:linear-gradient(135deg,#5d9cff,#2775db);
    background-position:center;
    background-size:cover;
    font-size:18px;
    font-weight:800;
}
.student-course-sidebar-cover.has-image span{display:none}
.student-course-module-nav .student-course-sidebar-info h2{
    min-height:0;
    margin:0;
    padding:0;
    display:block;
    border:0;
    color:#242a36;
    font-size:14px;
    font-weight:700;
    line-height:1.6;
}
.student-course-sidebar-menu{padding:14px 0}
.student-course-module-nav .student-course-sidebar-menu button{
    height:48px;
    padding:0 20px;
    grid-template-columns:22px 1fr auto;
    color:#7b818d;
    background:transparent;
    font-size:14px;
    font-weight:400;
}
.student-course-module-nav .student-course-sidebar-menu button:before{display:none}
.student-course-module-nav .student-course-sidebar-menu button:hover{
    color:#4e5969;
    background:#f8f9fa;
}
.student-course-module-nav .student-course-sidebar-menu button.active{
    color:#1677ff;
    background:#eef5ff;
    font-weight:600;
}
.student-course-module-nav .student-course-sidebar-menu i{
    width:20px;
    height:20px;
    display:grid;
    place-items:center;
    color:currentColor;
}
.student-course-module-nav .student-course-sidebar-menu svg{
    width:19px;
    height:19px;
    fill:currentColor;
}
.student-course-module-nav .student-course-sidebar-menu em{
    min-width:20px;
    height:18px;
    padding:0 5px;
    border-radius:9px;
    color:#8a909b;
    background:#e8eaed;
}
.student-course-module-nav .student-course-sidebar-menu button.active em{
    color:#fff;
    background:#1677ff;
}

/* —— AI课堂会话区：新建会话 + 历史会话列表 —— */
.student-course-history-panel{
    min-height:0;
    flex:1 1 auto;
    display:flex;
    flex-direction:column;
    padding:12px 12px 14px;
    border-top:1px solid #e8e8e8;
}
/* 仅 AI课堂 模块下展示新建会话 / 历史会话 */
.student-course-history-panel.is-hidden{display:none}
/* 下面的按钮选择器都以 .student-course-module-nav 开头，覆盖
   `.student-course-module-nav button` 的通用网格布局（grid/height/padding），
   否则新建会话、历史项、操作按钮会被强制渲染成 50px 三列网格（“下方乱了”）。 */
.student-course-module-nav .student-course-new-session{
    width:auto;
    height:auto;
    margin-bottom:12px;
    padding:8px;
    position:static;
    display:flex;
    align-items:center;
    justify-content:center;
    gap:4px;
    grid-template-columns:none;
    border:1px dashed #c9ccd6;
    border-radius:8px;
    color:#7b818d;
    background:transparent;
    font-size:13px;
    cursor:pointer;
    transition:border-color .15s,color .15s,background .15s;
}
.student-course-module-nav .student-course-new-session:hover{border-color:#8b90a0;color:#3f4654;background:#f2f3f6}
.student-course-history{min-height:0;flex:1;display:flex;flex-direction:column}
.student-course-history-head{
    margin-bottom:6px;
    display:flex;
    align-items:center;
    justify-content:space-between;
}
.student-course-history-head strong{color:#9aa0ad;font-size:12px;font-weight:500}
.student-course-module-nav .student-course-history-head button{
    width:auto;
    height:auto;
    margin-left:auto;
    padding:2px 4px;
    position:static;
    display:inline-flex;
    flex:0 0 auto;
    align-items:center;
    gap:2px;
    grid-template-columns:none;
    border:0;
    color:#9aa0ad;
    background:transparent;
    font-size:11px;
    cursor:pointer;
}
.student-course-module-nav .student-course-history-head button:hover{color:#3f4654}
.student-course-history-list{min-height:0;flex:1;display:flex;overflow-y:auto;flex-direction:column;gap:2px}
.student-course-history.collapsed .student-course-history-list{display:none}
.course-history-item{
    position:relative;
    padding:8px 10px 8px 14px;
    display:flex;
    align-items:center;
    border:none;
    border-radius:6px;
    cursor:pointer;
    transition:background .15s ease;
}
/* 左侧选中竖线指示器：默认透明，选中时显示 */
.course-history-item::before{
    content:'';
    position:absolute;
    left:4px;
    top:50%;
    transform:translateY(-50%);
    width:3px;
    height:16px;
    border-radius:2px;
    background:transparent;
    transition:background .15s ease;
}
.course-history-item:hover{background:var(--bg-hover)}
.course-history-item.active{background:rgba(0,0,0,.05);background:color-mix(in srgb,var(--text-primary) 5%,transparent)}
.course-history-item.active::before{background:var(--text-primary)}
.student-course-module-nav .course-history-main{
    width:auto;
    height:auto;
    min-width:0;
    flex:1;
    padding:0;
    position:static;
    display:flex;
    flex-direction:column;
    gap:3px;
    grid-template-columns:none;
    border:0;
    color:inherit;
    background:transparent;
    text-align:left;
    cursor:pointer;
}
/* 覆盖通用 `.student-course-module-nav button:hover{background:#fff}`，避免悬停时标题按钮变白 */
.student-course-module-nav .course-history-main:hover{background:transparent}
.student-course-module-nav .course-history-main strong{min-width:0;overflow:hidden;color:var(--text-secondary);font-size:13px;font-weight:400;line-height:1.5;white-space:nowrap;text-overflow:ellipsis;padding-right:24px}
.course-history-item.active .course-history-main strong{color:var(--text-primary);font-weight:500}
.student-course-module-nav .course-history-main small{min-width:0;overflow:hidden;color:var(--text-quaternary);font-size:11px;white-space:nowrap;text-overflow:ellipsis}
.course-history-actions{
    position:absolute;
    right:6px;
    top:50%;
    transform:translateY(-50%);
    display:flex;
    gap:2px;
    opacity:0;
    transition:opacity .15s ease;
}
.course-history-item:hover .course-history-actions{opacity:1}
.student-course-module-nav .course-history-actions button{
    width:22px;
    height:22px;
    padding:0;
    position:static;
    display:grid;
    place-items:center;
    grid-template-columns:none;
    gap:0;
    border:none;
    border-radius:5px;
    color:var(--text-tertiary);
    background:transparent;
    font-size:12px;
    cursor:pointer;
    transition:background .15s,color .15s;
}
.student-course-module-nav .course-history-actions button:hover{color:var(--text-primary);background:var(--bg-hover)}
.course-history-empty{padding:14px 10px;color:#b3b8c3;font-size:12px;line-height:1.6}

.student-course-module-content{padding:22px;background:#fff}
.student-course-chapter-layout{grid-template-columns:286px minmax(0,1fr);gap:20px}
.student-course-detail-page .student-course-outline{
    top:18px;
    max-height:calc(100vh - 104px);
    border:1px solid #e8e8e8;
    border-radius:8px;
    background:#fff;
}
.student-outline-title{border-bottom:1px solid #e8e8e8}
.student-outline-title strong{color:#252b36;font-size:15px}
.student-chapter-toggle{color:#252b36}
.student-chapter-toggle:hover{color:#1677ff}
.student-chapter-toggle>span{color:#989da7}
.student-section-link{
    margin:1px 8px;
    width:calc(100% - 16px);
    border:0;
    border-radius:5px;
}
.student-section-link:hover{background:#f7f9fc}
.student-section-link.active{
    border:0;
    color:#1677ff;
    background:#eaf3ff;
}
.student-section-link.active>i,
.student-section-link.active strong{color:#1677ff}
.student-section-link.completed>i{color:#28a66a;font-weight:800}
.student-section-progress u{background:#1677ff}
.student-section-progress b{color:#1677ff}
.student-lesson-head>.overline,
.course-module-heading>span{color:#1677ff}
.student-course-detail-page .student-lesson{
    border:0;
    border-radius:0;
    background:#fff;
}

@media(max-width:900px){
    .student-course-site-brand{width:auto;flex:0 0 auto}
    .student-course-site-brand strong{display:none}
    .student-course-workspace{grid-template-columns:76px minmax(0,1fr)}
    .student-course-history-panel{display:none}
    .student-course-sidebar-info{padding:13px 8px}
    .student-course-sidebar-cover{width:52px;height:40px;margin:0 auto}
    .student-course-module-nav .student-course-sidebar-info h2{display:none}
    .student-course-module-nav .student-course-sidebar-menu button{padding:0;display:flex;justify-content:center}
    .student-course-module-nav .student-course-sidebar-menu button span,
    .student-course-module-nav .student-course-sidebar-menu button em{display:none}
    .student-course-chapter-layout{grid-template-columns:1fr}
}
@media(max-width:600px){
    .student-course-minimal-header{padding:0 10px}
    .student-course-minimal-header h1{font-size:14px}
    .student-course-minimal-header>button{padding:6px;font-size:0}
    .student-course-minimal-header>button:after{content:"返回";font-size:12px}
    .student-course-workspace{grid-template-columns:1fr}
    .student-course-module-nav{min-height:0;display:block}
    .student-course-sidebar-info{display:none}
    .student-course-sidebar-menu{padding:0;display:grid;grid-template-columns:repeat(3,1fr)}
    .student-course-module-nav .student-course-sidebar-menu button{display:flex}
    .student-course-module-nav .student-course-sidebar-menu button span{display:block}
    .student-course-module-nav .student-course-sidebar-menu button.active{background:#eef5ff}
}

/* Grade-specific dynamic explanations: elementary uses metaphors, middle shows state, high adds formal notation. */
.agent-grade-banner{margin:0 28px 14px;padding:10px 12px;display:flex;align-items:center;gap:9px;border-radius:10px;background:#f0efff}.agent-grade-banner b{padding:5px 8px;border-radius:7px;color:#fff;background:#6556e8;font-size:8px}.agent-grade-banner span{color:#687084;font-size:8px}.agent-grade-banner.elementary{background:#fff4d8}.agent-grade-banner.elementary b{background:#ec9c33}.agent-grade-banner.high{background:#e8f1ff}.agent-grade-banner.high b{background:#3974c3}.concept-story-guide{display:flex;flex-direction:column;gap:7px}.concept-story-guide i{padding:9px 11px;border-radius:9px;color:#8a601d;background:#fff4d6;font-size:9px;font-style:normal}.concept-formula{margin:10px 0 0;padding:10px;border:1px solid #cfdcf0;border-radius:6px;color:#315f9d;background:#edf4ff;font:9px/1.6 ui-monospace,SFMono-Regular,monospace}.grade-elementary .network-layer{border-radius:18px;background:#fffaf0}.grade-elementary .network-layer.active{border-color:#efaa42;background:#fff0c5}.grade-elementary .network-node,.grade-elementary .network-output{border-radius:13px}.grade-elementary .loop-values i{border-radius:16px;background:#fff2cd}.grade-elementary .loop-values i.active{color:#fff;background:#ed9d35}.grade-elementary .loop-variable-panel span{border-radius:15px;background:#fff3d3}.grade-elementary .recursion-stage section,.grade-elementary .recursion-stage aside{border-radius:17px;background:#fffaf0}.grade-elementary #recursionStack article{border-radius:13px;border-color:#efb04d;background:#fff0c8}.grade-high .network-layer,.grade-high .network-node,.grade-high .network-output,.grade-high .loop-values i,.grade-high .loop-variable-panel span,.grade-high .recursion-stage section,.grade-high .recursion-stage aside,.grade-high #recursionStack article{border-radius:3px}.grade-high .network-layer{background:#f3f7fd}.grade-high .network-layer.active{border-color:#4e7dbc;background:#dfebfa}.grade-high .network-node span,.grade-high #recursionStack b{font-family:ui-monospace,SFMono-Regular,monospace}.grade-high .loop-variable-panel span{background:#eaf2ff}.grade-high #recursionStack article{border-color:#6f91c5;background:#eaf2ff}
.grade-elementary .agent-algorithm-bars{align-items:center}.grade-elementary .agent-algorithm-bars i{width:76px!important;height:76px!important;position:relative;border-radius:50%;color:#8b5a17;background:radial-gradient(circle at 34% 24%,#fff8d7 0 8%,#ffd46b 36%,#efa039 100%);box-shadow:inset -7px -8px 12px rgba(181,102,14,.16),0 9px 18px rgba(194,126,34,.14)}.grade-elementary .agent-algorithm-bars i:after{width:10px;height:10px;position:absolute;bottom:-5px;left:33px;transform:rotate(45deg);background:#efa039;content:""}.grade-elementary .agent-algorithm-bars i.active{color:#fff;background:radial-gradient(circle at 34% 24%,#ffd9d3 0 8%,#ff897b 38%,#ed605b 100%);transform:translateY(-12px) scale(1.06)}.grade-elementary .agent-algorithm-bars i.active:after{background:#ed605b}.grade-elementary .agent-algorithm-bars small{color:inherit}.agent-algorithm-bars i em{position:absolute;top:-23px;padding:3px 6px;border-radius:5px;color:#fff;background:#6656e8;font:7px ui-monospace,monospace;font-style:normal}.grade-high .agent-algorithm-bars i{border-radius:2px;background:linear-gradient(#5b8fd8,#376bb7)}.grade-high .agent-algorithm-bars i em{border-radius:2px;background:#3975c6}
.agent-algorithm-bars .swap-from-right{z-index:4;animation:student-sort-from-right .68s cubic-bezier(.22,.75,.22,1) both}.agent-algorithm-bars .swap-from-left{z-index:3;animation:student-sort-from-left .68s cubic-bezier(.22,.75,.22,1) both}.grade-elementary .agent-algorithm-bars .swap-from-right{animation-name:student-bubble-from-right}.grade-elementary .agent-algorithm-bars .swap-from-left{animation-name:student-bubble-from-left}@keyframes student-sort-from-right{0%{transform:translateX(calc(100% + 10px)) translateY(-5px)}50%{transform:translateX(calc(50% + 5px)) translateY(-28px)}100%{transform:translateX(0) translateY(-5px)}}@keyframes student-sort-from-left{0%{transform:translateX(calc(-100% - 10px)) translateY(-5px)}50%{transform:translateX(calc(-50% - 5px)) translateY(13px)}100%{transform:translateX(0) translateY(-5px)}}@keyframes student-bubble-from-right{0%{transform:translateX(86px) translateY(-12px) scale(1.06)}50%{transform:translateX(43px) translateY(-38px) scale(1.1)}100%{transform:translateX(0) translateY(-12px) scale(1.06)}}@keyframes student-bubble-from-left{0%{transform:translateX(-86px) translateY(-12px) scale(1.06)}50%{transform:translateX(-43px) translateY(8px) scale(1.02)}100%{transform:translateX(0) translateY(-12px) scale(1.06)}}@media(prefers-reduced-motion:reduce){.agent-algorithm-bars .swap-from-right,.agent-algorithm-bars .swap-from-left{animation-duration:.01ms}}
.agent-algorithm-bars i.settled,.agent-algorithm-bars i.settled.active{color:#155e47;background:linear-gradient(#83d9af,#39ad78);box-shadow:0 0 0 4px rgba(57,173,120,.12)}.agent-algorithm-bars i.settled small{color:#5fc49a;font-weight:800}.grade-elementary .agent-algorithm-bars i.settled,.grade-elementary .agent-algorithm-bars i.settled.active{color:#176b50;background:radial-gradient(circle at 34% 24%,#e9fff5 0 8%,#8be0b8 38%,#43b982 100%);box-shadow:inset -7px -8px 12px rgba(25,126,88,.15),0 0 0 4px rgba(67,185,130,.12)}.grade-elementary .agent-algorithm-bars i.settled:after{background:#43b982}.grade-high .agent-algorithm-bars i.settled,.grade-high .agent-algorithm-bars i.settled.active{background:linear-gradient(#72cda2,#319f70)}
.grade-middle .agent-algorithm-bars{padding-top:48px;align-items:end;background:linear-gradient(#dff2ff 0 70%,#eaf4e4 70% 100%)}.grade-middle .agent-algorithm-bars i{min-width:42px;max-width:54px;border-radius:15px 15px 5px 5px;background:linear-gradient(#7180a0,#58657f);box-shadow:inset 0 -8px rgba(36,44,62,.12)}.grade-middle .agent-algorithm-bars i:before{width:29px;height:29px;position:absolute;top:-25px;left:50%;border:3px solid #465066;border-radius:50%;background:#ffd6ba;box-shadow:0 -6px 0 -1px #465066;content:"";transform:translateX(-50%)}.grade-middle .agent-algorithm-bars i:after{width:9px;height:25px;position:absolute;bottom:-8px;left:9px;border-radius:5px;background:#3f485d;box-shadow:27px 0 #3f485d;content:""}.grade-middle .agent-algorithm-bars i.active{background:linear-gradient(#f6b35d,#eb8e36)}.grade-middle .agent-algorithm-bars i.settled,.grade-middle .agent-algorithm-bars i.settled.active{background:linear-gradient(#77d3a6,#36a974)}.grade-middle .agent-algorithm-bars b{top:-47px;padding:3px 5px;border-radius:6px;color:#344054;background:#fff;box-shadow:0 2px 7px rgba(33,42,65,.12);font-size:7px;white-space:nowrap}.grade-middle .agent-algorithm-bars i em{top:-63px}.student-sort-complexity{margin-top:12px;display:grid;grid-template-columns:1fr 1fr;gap:7px}.student-sort-complexity>span{padding:9px;display:flex;flex-direction:column;border:1px solid #cddbed;border-radius:5px;background:#edf4ff}.student-sort-complexity small{color:#74839b;font-size:6px}.student-sort-complexity b{margin-top:4px;color:#315f9d;font:7px/1.5 ui-monospace,SFMono-Regular,monospace}.student-sort-complexity i{color:#6656e8;font-style:normal}
.grade-middle .agent-algorithm-bars{height:280px;padding:2px 8px 0;align-items:end;gap:2px}.grade-middle .agent-algorithm-bars i,.grade-middle .agent-algorithm-bars i.active,.grade-middle .agent-algorithm-bars i.settled,.grade-middle .agent-algorithm-bars i.settled.active{height:245px!important;min-width:58px;max-width:92px;border-radius:17px;background:transparent;box-shadow:none}.grade-middle .agent-algorithm-bars i:before,.grade-middle .agent-algorithm-bars i:after{display:none}.grade-middle .agent-algorithm-bars .cartoon-student-svg{width:100%;height:236px;overflow:visible}.grade-middle .agent-algorithm-bars i.settled{background:rgba(67,185,130,.08);box-shadow:inset 0 0 0 2px rgba(67,185,130,.22)}.grade-middle .agent-algorithm-bars i>small{bottom:-4px;padding:3px 6px;border-radius:6px;color:#657083;background:rgba(255,255,255,.9);font-size:6px;white-space:nowrap}.grade-middle .agent-algorithm-bars i em{top:7px;left:4px;z-index:5}.grade-middle .agent-algorithm-bars .swap-from-right{animation-name:student-svg-person-from-right}.grade-middle .agent-algorithm-bars .swap-from-left{animation-name:student-svg-person-from-left}@keyframes student-svg-person-from-right{0%{transform:translateX(calc(100% + 2px)) translateY(-5px)}50%{transform:translateX(calc(50% + 1px)) translateY(-30px)}100%{transform:translateX(0) translateY(-5px)}}@keyframes student-svg-person-from-left{0%{transform:translateX(calc(-100% - 2px)) translateY(-5px)}50%{transform:translateX(calc(-50% - 1px)) translateY(14px)}100%{transform:translateX(0) translateY(-5px)}}

/* Middle-school bubble sort: full-size illustrated students and a distinct sorted area. */
.agent-canvas-body:has(.grade-middle[data-agent-algorithm="bubble_sort"]){overflow-x:auto}
.grade-middle[data-agent-algorithm="bubble_sort"]{width:1320px;max-width:none}
.grade-middle[data-agent-algorithm="bubble_sort"]>header h2{font-size:36px;font-weight:900}
.grade-middle[data-agent-algorithm="bubble_sort"]>header p{font-size:24px;line-height:1.6}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-grade-banner b,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-grade-banner span,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-input label,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-input input,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-input button{font-size:20px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-input input,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-input button{height:48px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-stage{position:relative;padding:18px 20px 0}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars{height:500px;padding:0 20px 36px;position:relative;z-index:2;align-items:flex-end;justify-content:flex-start;gap:40px;border:1px solid #cae1ef;background:linear-gradient(#EAF7FF 0 72%,#EAF6E5 72% 100%);overflow:visible}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.active,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled.active{width:140px;height:440px!important;min-width:140px;max-width:140px;flex:0 0 140px;border-radius:18px;background:transparent;box-shadow:none}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .cartoon-student-svg{width:140px;height:390px;display:block;overflow:visible}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i>small{min-width:132px;min-height:36px;padding:4px 10px;bottom:2px;display:grid;place-items:center;border:2px solid #DDE4EE;border-radius:10px;color:#556174;background:rgba(255,255,255,.96);box-shadow:0 4px 12px rgba(45,61,84,.12);font-size:20px;font-weight:800;line-height:1.2;white-space:nowrap}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled>small{border-color:#64C892;color:#1D7A50;background:#EDFBF4}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled:after{width:30px;height:30px;position:absolute;z-index:8;top:44px;right:0;display:grid;border:3px solid #fff;border-radius:50%;place-items:center;color:#fff;background:linear-gradient(145deg,#62D39A,#239D68);box-shadow:0 5px 12px rgba(35,157,104,.3);content:"✓";font:900 20px/1 "Microsoft YaHei",sans-serif}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.comparing-person{z-index:6;animation:middle-student-nod .6s ease-in-out}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i .middle-compare-pointer{width:58px;height:62px;padding:0;position:absolute;z-index:10;top:4px;left:50%;display:flex;align-items:center;justify-content:center;flex-direction:column;border:0;color:#FFD12E;background:transparent;filter:drop-shadow(0 5px 4px rgba(118,82,0,.45));font:900 40px/30px "Microsoft YaHei",sans-serif;transform:translateX(-50%)}
.grade-middle[data-agent-algorithm="bubble_sort"] .middle-compare-pointer span{padding:2px 7px;border-radius:8px;color:#6B4B00;background:#FFE787;font:900 16px/20px ui-monospace,monospace}
.grade-middle[data-agent-algorithm="bubble_sort"] .middle-sorted-region{width:var(--middle-sorted-width,200px);position:absolute;z-index:4;top:18px;right:20px;height:500px;border:4px solid #48B97D;border-radius:18px;box-shadow:inset 0 0 0 7px rgba(72,185,125,.08),0 8px 20px rgba(38,135,88,.12);pointer-events:none;transition:width .35s ease}
.grade-middle[data-agent-algorithm="bubble_sort"] .middle-sorted-region strong{position:absolute;top:12px;right:14px;padding:7px 13px;border-radius:10px;color:#176C48;background:#E8F8F0;font-size:24px;font-weight:900;white-space:nowrap}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-step{min-height:88px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-step b{font-size:24px;line-height:1.6}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-step span{font-size:20px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-detail>section{min-height:200px;padding:20px 24px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-detail header{font-size:22px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-detail li{padding:5px 12px 5px 48px;font:18px/1.8 ui-monospace,SFMono-Regular,Menlo,monospace}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-detail li:before{left:16px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-metrics small{font-size:18px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-metrics b{font-size:26px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-controls button{min-height:54px;padding:10px 20px;font-size:22px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-controls{position:sticky;z-index:30;top:0;justify-content:flex-start;border-bottom:1px solid #DDE4EC;background:rgba(255,255,255,.96);box-shadow:0 9px 22px rgba(45,61,84,.12);backdrop-filter:blur(12px)}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-controls .primary{box-shadow:0 7px 16px rgba(102,86,232,.25)}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .swap-from-right{animation:middle-student-from-right 1.2s cubic-bezier(.34,1.56,.64,1) both}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .swap-from-left{animation:middle-student-from-left 1.2s cubic-bezier(.34,1.56,.64,1) both}
@keyframes middle-student-nod{0%,100%{transform:rotate(0)}25%{transform:rotate(5deg)}75%{transform:rotate(-5deg)}}
@keyframes middle-student-from-right{0%{transform:translateX(180px)}48%{transform:translateX(90px) translateY(-46px) rotate(3deg)}100%{transform:translateX(0)}}
@keyframes middle-student-from-left{0%{transform:translateX(-180px)}48%{transform:translateX(-90px) translateY(22px) rotate(-3deg)}100%{transform:translateX(0)}}

/* Keep animation, Python code, state and controls in one viewport. */
.grade-middle[data-agent-algorithm="bubble_sort"]{
    width:auto;
    max-width:none;
    height:calc(100dvh - 24px);
    margin:0;
    position:fixed;
    z-index:220;
    inset:12px;
    display:grid;
    grid-template-columns:minmax(760px,1.7fr) minmax(420px,.8fr);
    grid-template-rows:auto auto auto minmax(0,1fr);
    overflow:hidden;
    border-radius:20px;
    box-shadow:0 28px 90px rgba(20,28,48,.35);
}
.grade-middle[data-agent-algorithm="bubble_sort"]>header{grid-column:1/-1;padding:10px 18px}
.grade-middle[data-agent-algorithm="bubble_sort"]>header h2{margin:2px 0;font-size:36px}
.grade-middle[data-agent-algorithm="bubble_sort"]>header p{font-size:24px;line-height:1.35}
.grade-middle[data-agent-algorithm="bubble_sort"]>.agent-grade-banner{grid-column:1;grid-row:2;margin:5px 12px 5px 18px}
.grade-middle[data-agent-algorithm="bubble_sort"]>.agent-algorithm-input{grid-column:1;grid-row:3;padding:7px 18px}
.grade-middle[data-agent-algorithm="bubble_sort"]>.agent-algorithm-controls{grid-column:2;grid-row:3;padding:7px 18px;position:static;justify-content:flex-end;box-shadow:none}
.grade-middle[data-agent-algorithm="bubble_sort"]>.agent-algorithm-stage{grid-column:1;grid-row:4;min-height:0;padding:10px 10px 0;overflow:hidden}
.grade-middle[data-agent-algorithm="bubble_sort"]>.agent-algorithm-detail{grid-column:2;grid-row:4;min-height:0;display:grid;grid-template-columns:1fr;grid-template-rows:minmax(200px,1.2fr) minmax(170px,.8fr);overflow:hidden;border-left:1px solid #E1E5EC}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-detail>section{min-height:0;padding:14px 18px;overflow:hidden}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-detail>section+section{border-top:1px solid #EAEBEF;border-left:0}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars{height:calc(100% - 78px);min-height:410px;padding:0 14px 34px;gap:40px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.active,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled,
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled.active{width:120px;height:420px!important;min-width:120px;max-width:120px;flex-basis:120px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .cartoon-student-svg{width:120px;height:390px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i>small{min-width:116px;min-height:30px;padding:3px 7px;font-size:20px}
.grade-middle[data-agent-algorithm="bubble_sort"] .middle-sorted-region{width:auto;top:10px;right:10px;left:var(--middle-sorted-left,970px);height:calc(100% - 88px)}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-step{min-height:68px;padding:5px 8px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-detail li{padding:3px 8px 3px 44px;font-size:18px;line-height:1.55}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-detail header{margin-bottom:5px}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-metrics span{padding:7px 4px}
.grade-middle[data-agent-algorithm="bubble_sort"]>.agent-algorithm-checkpoint:not([hidden]){position:absolute;z-index:50;inset:90px 30px 30px 55%;overflow:auto;box-shadow:0 18px 60px rgba(29,35,59,.28)}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .swap-from-right{animation-name:middle-student-from-right-compact}
.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .swap-from-left{animation-name:middle-student-from-left-compact}
@keyframes middle-student-from-right-compact{0%{transform:translateX(160px)}48%{transform:translateX(80px) translateY(-42px) rotate(3deg)}100%{transform:translateX(0)}}
@keyframes middle-student-from-left-compact{0%{transform:translateX(-160px)}48%{transform:translateX(-80px) translateY(20px) rotate(-3deg)}100%{transform:translateX(0)}}
@media(max-height:760px){
    .grade-middle[data-agent-algorithm="bubble_sort"]>header p{font-size:20px}
    .grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars{min-height:360px}
    .grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i,
    .grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.active,
    .grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled,
    .grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled.active{height:370px!important}
    .grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .cartoon-student-svg{height:340px}
}

/* V6 compact 1200×680 middle-school canvas: no internal scroll and no overlap. */
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]{
    width:1200px;
    height:680px;
    min-width:1200px;
    max-width:1200px;
    margin:0;
    padding:0;
    position:fixed;
    z-index:240;
    top:50%;
    left:50%;
    display:grid;
    grid-template-columns:1fr;
    grid-template-rows:50px 370px 260px;
    overflow:hidden;
    border-radius:18px;
    background:#fff;
    box-sizing:border-box;
    transform:translate(-50%,-50%) scale(var(--middle-screen-scale,1));
    transform-origin:center;
    box-shadow:0 30px 100px rgba(18,27,48,.38);
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]>header{
    height:50px;
    padding:8px 20px;
    grid-column:1;
    grid-row:1;
    align-items:center;
    box-sizing:border-box;
}
.middle-bubble-screen>header>div{display:flex;align-items:baseline;gap:16px}
.middle-bubble-screen>header span{display:none}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]>header h2{margin:0;font-size:24px;line-height:1.2}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]>header p{margin:0;font-size:14px;line-height:1.4;white-space:nowrap}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]>header button{width:30px;height:30px;margin-left:auto}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]>.agent-algorithm-stage{
    height:370px;
    padding:10px 20px;
    grid-column:1;
    grid-row:2;
    overflow:hidden;
    box-sizing:border-box;
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars{
    width:1160px;
    height:350px;
    min-height:350px;
    padding:10px 20px;
    gap:30px;
    align-items:flex-end;
    justify-content:center;
    overflow:hidden;
    box-sizing:border-box;
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i,
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.active,
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled,
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled.active{
    width:140px;
    height:300px!important;
    min-width:140px;
    max-width:140px;
    flex:0 0 140px;
    position:relative;
    opacity:1;
}
.middle-bubble-screen .student-height-label-group,
.middle-bubble-screen .student-number-group{display:none}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .cartoon-student-svg{
    width:80px;
    height:200px;
    position:absolute;
    top:32px;
    left:30px;
}
.middle-bubble-screen .middle-height-label{
    width:auto;
    height:24px;
    padding:2px 8px;
    position:absolute;
    z-index:5;
    top:0;
    left:50%;
    display:grid;
    place-items:center;
    border:1px solid #B8D6E8;
    border-radius:8px;
    color:#315F78;
    background:#fff;
    box-shadow:0 3px 8px rgba(35,66,85,.12);
    font-size:14px;
    line-height:1;
    white-space:nowrap;
    transform:translateX(-50%);
    box-sizing:border-box;
}
.middle-bubble-screen .middle-number-badge{
    width:34px;
    height:24px;
    position:absolute;
    top:238px;
    left:50%;
    display:grid;
    place-items:center;
    border-radius:12px;
    color:#fff;
    background:linear-gradient(145deg,#6F82A2,#34435E);
    font-size:15px;
    line-height:1;
    transform:translateX(-50%);
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i>small{
    width:104px;
    min-width:104px;
    height:24px;
    min-height:24px;
    padding:0 8px;
    bottom:10px;
    border-radius:8px;
    font-size:12px;
    line-height:24px;
    box-sizing:border-box;
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled{
    opacity:.6;
    transform:translateY(8px);
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i.settled:after{
    width:72px;
    height:24px;
    top:32px;
    right:0;
    border:2px solid #fff;
    border-radius:12px;
    content:"✓ 已就位";
    font-size:12px;
    line-height:1;
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i .middle-compare-pointer{
    width:30px;
    height:25px;
    top:54px;
    left:50%;
    font-size:20px;
    line-height:14px;
}
.middle-bubble-screen .middle-compare-pointer span{padding:1px 4px;font-size:10px;line-height:12px}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .swap-from-right{animation:middle-screen-from-right 1.2s cubic-bezier(.34,1.56,.64,1) both}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .swap-from-left{animation:middle-screen-from-left 1.2s cubic-bezier(.34,1.56,.64,1) both}
@keyframes middle-screen-from-right{0%{transform:translateX(170px)}48%{transform:translateX(85px) translateY(-25px)}100%{transform:translateX(0)}}
@keyframes middle-screen-from-left{0%{transform:translateX(-170px)}48%{transform:translateX(-85px) translateY(12px)}100%{transform:translateX(0)}}
.middle-bubble-screen>.middle-bubble-bottom{
    width:1200px;
    height:260px;
    grid-column:1;
    grid-row:3;
    display:grid;
    grid-template-columns:3fr 2fr;
    overflow:hidden;
    border-top:10px solid #fff;
    box-sizing:border-box;
}
.middle-bubble-screen .middle-bubble-bottom>section{height:250px;min-height:0;padding:12px 16px;overflow:hidden;box-sizing:border-box}
.middle-bubble-screen .middle-bubble-code{color:#D7DEEE;background:#171C2C}
.middle-bubble-screen .middle-bubble-code>header{margin:0 0 8px;color:#AEB8D0;font-size:14px}
.middle-bubble-screen .middle-bubble-code ol{margin:0;padding:0;overflow:hidden}
.middle-bubble-screen .middle-bubble-code li{
    min-height:27px;
    padding:3px 10px 3px 42px;
    overflow:hidden;
    color:#AEB8D0;
    background:transparent;
    font:14px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;
    white-space:pre;
    text-overflow:ellipsis;
    box-sizing:border-box;
}
.middle-bubble-screen .middle-bubble-code li.active{color:#fff;background:#6656E8}
.middle-bubble-screen .middle-bubble-operation{display:grid;grid-template-rows:54px 72px minmax(0,1fr);gap:8px;background:#FAFBFD}
.middle-bubble-screen .agent-algorithm-step{min-height:0;padding:8px 10px;border-radius:8px;background:#F0EEFF}
.middle-bubble-screen .agent-algorithm-step b{max-width:390px;overflow:hidden;font-size:15px;line-height:1.4;white-space:nowrap;text-overflow:ellipsis}
.middle-bubble-screen .agent-algorithm-step span{font-size:13px}
.middle-bubble-screen .agent-algorithm-metrics{gap:8px}
.middle-bubble-screen .agent-algorithm-metrics span{padding:6px 4px}
.middle-bubble-screen .agent-algorithm-metrics small{font-size:12px}
.middle-bubble-screen .agent-algorithm-metrics b{margin-top:2px;font-size:20px}
.middle-bubble-screen .middle-bubble-actions{min-height:0;display:grid;grid-template-columns:1fr auto;align-items:end;gap:8px}
.middle-bubble-screen .agent-algorithm-input{padding:0;display:grid;grid-template-columns:1fr auto;align-items:end;gap:8px;border:0;background:transparent}
.middle-bubble-screen .agent-algorithm-input label{gap:3px;font-size:12px}
.middle-bubble-screen .agent-algorithm-input input{height:36px;padding:0 8px;font-size:14px}
.middle-bubble-screen .agent-algorithm-input button{height:36px;padding:0 9px;font-size:12px}
.middle-bubble-screen .agent-algorithm-controls{padding:0;position:static;display:flex;gap:8px;box-shadow:none;background:transparent}
.middle-bubble-screen .agent-algorithm-controls button{min-height:36px;height:36px;padding:0 10px;font-size:13px;white-space:nowrap}
.middle-bubble-screen>.agent-algorithm-checkpoint:not([hidden]){position:absolute;z-index:60;inset:80px 210px;background:#fff;overflow:hidden;box-shadow:0 22px 70px rgba(21,30,51,.32)}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]>.middle-bubble-bottom{
    width:1200px;
    height:260px;
    min-height:260px;
    padding:0;
    grid-column:1;
    grid-row:3;
    display:grid;
    grid-template-columns:3fr 2fr;
    grid-template-rows:1fr;
    overflow:hidden;
    border-top:10px solid #fff;
    border-left:0;
    box-sizing:border-box;
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]>.middle-bubble-bottom>section{
    height:250px;
    min-height:0;
    padding:12px 16px;
    overflow:hidden;
    box-sizing:border-box;
}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-operation{display:grid;grid-template-columns:1fr;grid-template-rows:54px 72px minmax(0,1fr);gap:8px;border-left:1px solid #EAEBEF}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-actions{min-width:0;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) 230px;grid-template-rows:1fr;align-items:end;gap:8px}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-actions .agent-algorithm-input{min-width:0;padding:0;position:static;display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:1fr;align-items:end;gap:8px;border:0;background:transparent}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-actions .agent-algorithm-input label{min-width:0;font-size:12px}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-actions .agent-algorithm-input input{width:100%;min-width:0;height:36px;padding:0 8px;font-size:14px;box-sizing:border-box}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-actions .agent-algorithm-input button{height:36px;padding:0 7px;font-size:12px}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-actions .agent-algorithm-controls{width:230px;padding:0;position:static;display:flex;justify-content:flex-start;gap:8px;border:0;box-shadow:none;background:transparent}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-actions .agent-algorithm-controls button{min-width:0;min-height:36px;height:36px;padding:0 8px;flex:1;font-size:13px}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .middle-bubble-code li{min-height:27px;padding:3px 10px 3px 42px;overflow:hidden;font:14px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre;text-overflow:ellipsis;box-sizing:border-box}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .middle-height-label{width:auto;height:24px;padding:2px 8px;top:0;left:50%;display:grid;place-items:center;border:1px solid #B8D6E8;border-radius:8px;color:#315F78;background:#fff;box-shadow:0 3px 8px rgba(35,66,85,.12);font:800 14px/1 "Microsoft YaHei",sans-serif;white-space:nowrap;transform:translateX(-50%)}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .middle-number-badge{width:34px;height:24px;padding:0;top:230px;left:50%;display:grid;place-items:center;border-radius:12px;color:#fff;background:linear-gradient(145deg,#6F82A2,#34435E);box-shadow:none;font:900 15px/1 "Microsoft YaHei",sans-serif;transform:translateX(-50%)}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars .cartoon-student-svg{width:80px;height:200px;top:24px;left:30px}
.middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"] .agent-algorithm-bars i>small{bottom:18px}

/* AI rich content stays compact in chat and opens in an 85vw × 85vh interactive modal. */
body.agent-content-modal-open{overflow:hidden}
.course-agent-shell{grid-template-columns:minmax(0,1fr)}
.course-agent-chat{width:min(920px,100%);margin:0 auto;border-right:1px solid #e2e4ec;border-left:1px solid #e2e4ec}
.agent-rich-preview-card{
    width:min(540px,100%);
    min-height:104px;
    margin-top:9px;
    padding:10px;
    display:grid;
    grid-template-columns:124px minmax(0,1fr) auto;
    align-items:center;
    gap:12px;
    overflow:hidden;
    border:1px solid #DCD8FA;
    border-radius:12px;
    background:linear-gradient(135deg,#FBFAFF,#F3F7FF);
    box-shadow:0 7px 18px rgba(68,57,155,.07);
}
.agent-rich-preview-card>div{min-width:0;display:flex;flex-direction:column}
.agent-rich-preview-card>div small{color:#7264DF;font-size:8px;font-weight:800;letter-spacing:.08em}
.agent-rich-preview-card>div strong{margin-top:5px;overflow:hidden;color:#30374B;font-size:12px;white-space:nowrap;text-overflow:ellipsis}
.agent-rich-preview-card>div span{margin-top:5px;color:#8B91A1;font-size:9px}
.agent-rich-preview-card>button{height:34px;padding:0 11px;border-radius:8px;color:#fff;background:#6556E3;font-size:9px;font-weight:750;white-space:nowrap}
.agent-rich-preview-thumb{
    width:124px;
    height:76px;
    position:relative;
    display:flex;
    align-items:flex-end;
    justify-content:center;
    gap:7px;
    overflow:hidden;
    border-radius:9px;
    background:linear-gradient(145deg,#252C45,#3A4262);
}
.agent-rich-preview-thumb.bars i{width:12px;border-radius:4px 4px 0 0;background:linear-gradient(#8D80F6,#6556E3)}
.agent-rich-preview-thumb.bars i:nth-child(1){height:28px}.agent-rich-preview-thumb.bars i:nth-child(2){height:47px}.agent-rich-preview-thumb.bars i:nth-child(3){height:35px}.agent-rich-preview-thumb.bars i:nth-child(4){height:60px}.agent-rich-preview-thumb.bars i:nth-child(5){height:42px}
.agent-rich-preview-thumb.neural{align-items:center;justify-content:space-around;flex-wrap:wrap;padding:12px 28px;box-sizing:border-box}
.agent-rich-preview-thumb.neural:before,.agent-rich-preview-thumb.neural:after{position:absolute;left:35px;right:35px;height:1px;background:#9187EE;transform:rotate(16deg);content:""}.agent-rich-preview-thumb.neural:after{transform:rotate(-16deg)}
.agent-rich-preview-thumb.neural i{width:10px;height:10px;position:relative;z-index:1;border:2px solid #BDB6FF;border-radius:50%;background:#6C5CE4}
.agent-rich-preview-thumb.stack{align-items:center;flex-direction:column-reverse;gap:4px}.agent-rich-preview-thumb.stack i{height:13px;border-radius:4px;background:linear-gradient(90deg,#7869EC,#9B91F5)}.agent-rich-preview-thumb.stack i:nth-child(1){width:72px}.agent-rich-preview-thumb.stack i:nth-child(2){width:58px}.agent-rich-preview-thumb.stack i:nth-child(3){width:44px}
.agent-rich-preview-thumb.code{padding:12px;align-items:flex-start;justify-content:center;flex-direction:column;gap:7px;box-sizing:border-box}.agent-rich-preview-thumb.code i{width:75px;height:4px;border-radius:3px;background:#76809A}.agent-rich-preview-thumb.code i:nth-child(2){width:54px;background:#8B7FF0}.agent-rich-preview-thumb.code b{position:absolute;right:10px;bottom:7px;color:#8FE0BE;font:800 13px ui-monospace,monospace}
.agent-rich-preview-thumb.image{align-items:center;background:#EEF0F5}.agent-rich-preview-thumb.image img{width:100%;height:100%;object-fit:cover}
.agent-rich-preview-card.src-premium{border-color:#F5D78E;background:linear-gradient(135deg,#FFFCF3,#FBF6E6);box-shadow:0 7px 18px rgba(180,120,10,.10)}
.agent-rich-preview-card.src-generic{border-color:#BFD7FE;background:linear-gradient(135deg,#F7FBFF,#EDF4FF);box-shadow:0 7px 18px rgba(30,90,220,.08)}
.agent-rich-preview-card.src-deepseek{border-color:#E0E3E8;background:linear-gradient(135deg,#FAFAFB,#F1F2F4);box-shadow:0 7px 18px rgba(90,95,105,.06)}
.agent-source-badge{display:inline-block;margin-left:6px;padding:1px 7px;border-radius:999px;font-style:normal;font-size:8px;font-weight:800;letter-spacing:.02em;vertical-align:1px}
.agent-source-badge.src-premium{color:#9A6B00;background:#FBEECB}
.agent-source-badge.src-generic{color:#1D5BCE;background:#DBE9FF}
.agent-source-badge.src-deepseek{color:#5B6472;background:#ECEEF1}
.agent-source-badge.src-teacher_html{color:#6D28D9;background:#EDE9FE}
.agent-teacher-html{
    width:min(560px,100%);
    margin-top:9px;
    overflow:hidden;
    border:2px solid #C4B5FD;
    border-radius:12px;
    background:#FFF;
    box-shadow:0 7px 18px rgba(109,40,217,.10);
}
.agent-teacher-html>header{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    padding:8px 12px;
    border-bottom:1px solid #EDE9FE;
    background:#F5F3FF;
}
.agent-teacher-html-author{color:#6D28D9;font-size:10px;font-weight:800}
.agent-teacher-html>header>button{border:0;color:#6D28D9;background:none;font-size:10px;font-weight:700;cursor:pointer}
.agent-teacher-html>header>button:hover{text-decoration:underline}
.agent-teacher-html iframe{display:block;width:100%;height:500px;border:0}
.agent-teacher-html.collapsed iframe{display:none}
.agent-ppt{
    width:min(560px,100%);
    margin-top:9px;
    overflow:hidden;
    border:2px solid #BFD7FE;
    border-radius:12px;
    background:#FFF;
    box-shadow:0 7px 18px rgba(30,90,220,.10);
}
.agent-ppt>header{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    padding:8px 12px;
    border-bottom:1px solid #E8F0FE;
    background:#F4F8FF;
}
.agent-ppt-title{color:#1E56C8;font-size:10px;font-weight:800}
.agent-ppt>header>button{border:0;color:#1E56C8;background:none;font-size:10px;font-weight:700;cursor:pointer}
.agent-ppt>header>button:hover{text-decoration:underline}
.agent-ppt iframe{display:block;width:100%;height:520px;border:0}
.agent-ppt.collapsed iframe{display:none}
.agent-content-modal{
    position:fixed;
    z-index:1200;
    inset:0;
    display:grid;
    place-items:center;
    background:rgba(10,14,25,.72);
    backdrop-filter:blur(3px);
    animation:agent-modal-fade .18s ease-out;
}
.agent-content-modal[hidden]{display:none}
.agent-content-modal-panel{
    width:min(90vw,1100px);
    height:min(90vh,700px);
    min-width:0;
    min-height:0;
    display:grid;
    grid-template-rows:50px minmax(0,1fr);
    overflow:hidden;
    border-radius:16px;
    background:#F6F7FB;
    box-shadow:0 28px 90px rgba(0,0,0,.4);
    animation:agent-modal-panel-in .22s cubic-bezier(.2,.8,.2,1);
}
.agent-content-modal .agent-canvas-head{height:50px;padding:0 10px 0 18px;position:relative;z-index:300;border-bottom:1px solid #E4E6EC;background:#fff}
.agent-content-modal .agent-canvas-head h2{font-size:15px}
.agent-content-modal-close{width:36px;height:36px;display:grid;place-items:center;border-radius:9px;color:#626A7C;background:#F0F1F5;font-size:23px;line-height:1}
.agent-content-modal-close:hover{color:#fff;background:#6556E3}
.agent-content-modal .agent-canvas-body{min-width:0;min-height:0;padding:18px;position:relative;overflow:hidden;scrollbar-gutter:auto}
.agent-content-modal .agent-algorithm-lab>header [data-close-agent-tool]{display:none}
.agent-content-modal .middle-bubble-screen.grade-middle[data-agent-algorithm="bubble_sort"]{position:absolute;top:50%;left:50%}
.agent-content-modal .agent-canvas-body:has(.middle-bubble-screen){padding:0;overflow:hidden;scrollbar-gutter:auto}
.agent-modal-code-viewer,.agent-modal-image-viewer{width:100%;height:100%;margin:0;overflow:hidden;border-radius:12px;background:#fff;box-sizing:border-box}
.agent-modal-code-viewer{display:grid;grid-template-rows:50px minmax(0,1fr);background:#171C2C}
.agent-modal-code-viewer>header{padding:0 18px;display:flex;align-items:center;gap:12px;color:#D6DCEC;border-bottom:1px solid #30374B;background:#20263A}
.agent-modal-code-viewer>header span{padding:5px 8px;border-radius:5px;color:#A99FFF;background:#302A59;font:11px ui-monospace,monospace}
.agent-modal-code-viewer>header strong{font-size:14px}
.agent-modal-code-viewer pre{margin:0;padding:22px;overflow:hidden;color:#D9E1F2;font:15px/1.8 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre}
.agent-modal-image-viewer{padding:16px;display:flex;align-items:center;justify-content:center;position:relative;background:#EEF0F5}
.agent-modal-image-viewer img{max-width:100%;max-height:100%;object-fit:contain;filter:drop-shadow(0 12px 28px rgba(27,32,48,.16))}
.agent-modal-image-viewer p{padding:7px 11px;position:absolute;left:24px;bottom:18px;border-radius:7px;color:#fff;background:rgba(24,29,45,.72);font-size:11px}
@keyframes agent-modal-fade{from{opacity:0}}
@keyframes agent-modal-panel-in{from{opacity:0;transform:translateY(12px) scale(.985)}}

/* Only the student-side fruit animation modal: fixed vertical bands + fit-to-viewport stage. */
.agent-content-modal .fruit-river-agent-lab{
    width:100%;
    max-width:none;
    height:100%;
    margin:0;
    position:relative;
    display:flex;
    flex-direction:column;
    overflow:hidden;
    border:0;
    border-radius:0;
    box-shadow:none;
}
.agent-content-modal .fruit-river-agent-lab>header{
    height:35px;
    min-height:35px;
    padding:0 16px;
    flex:0 0 35px;
    align-items:center;
    box-sizing:border-box;
}
.agent-content-modal .fruit-river-agent-lab>header>div{min-width:0}
.agent-content-modal .fruit-river-agent-lab>header span,
.agent-content-modal .fruit-river-agent-lab>header h2,
.agent-content-modal .fruit-river-agent-lab>header button{display:none}
.agent-content-modal .fruit-river-agent-lab>header p{
    margin:0;
    overflow:hidden;
    font-size:13px;
    line-height:35px;
    white-space:nowrap;
    text-overflow:ellipsis;
}
.agent-content-modal .fruit-river-agent-lab>.agent-grade-banner{
    height:40px;
    min-height:40px;
    margin:0;
    padding:0 16px;
    flex:0 0 40px;
    border-radius:0;
    box-sizing:border-box;
}
.agent-content-modal .fruit-river-agent-lab>.agent-grade-banner b{font-size:10px}
.agent-content-modal .fruit-river-agent-lab>.agent-grade-banner span{font-size:10px}
.agent-content-modal .fruit-river-agent-lab>.fruit-river-host{
    min-width:0;
    min-height:0;
    padding:0;
    position:relative;
    flex:1 1 auto;
    overflow:hidden;
}
.agent-content-modal .fruit-river-agent-lab .fruit-river-page{
    width:1000px;
    min-width:1000px;
    height:533px;
    margin:0;
    position:absolute;
    top:50%;
    left:50%;
    grid-template-rows:40px 438px 55px;
    border-radius:18px;
    transform:translate(-50%,-50%) scale(var(--fruit-modal-scale,1));
    transform-origin:center;
}
.agent-content-modal .fruit-river-agent-lab .fruit-river-narration{
    height:40px;
    padding:0 20px;
    font-size:18px;
    line-height:40px;
    box-sizing:border-box;
}
.agent-content-modal .fruit-river-agent-lab .fruit-river-controls{
    height:55px;
    min-height:55px;
    padding:6px 14px;
    gap:10px;
    box-sizing:border-box;
}
.agent-content-modal .fruit-river-agent-lab .fruit-river-controls button{
    min-height:40px;
    height:40px;
    padding:0 18px;
    font-size:17px;
}
.agent-content-modal .fruit-river-agent-lab .fruit-values-editor{
    height:40px;
    padding:3px 4px 3px 10px;
    flex:0 0 auto;
}
.agent-content-modal .fruit-river-agent-lab .fruit-values-editor span{font-size:12px}
.agent-content-modal .fruit-river-agent-lab .fruit-values-editor input{
    width:118px;
    height:30px;
    padding:0 8px;
    font-size:13px;
}
.agent-content-modal .fruit-river-agent-lab .fruit-river-controls .fruit-values-editor button{
    min-height:30px;
    height:30px;
    padding:0 10px;
    font-size:12px;
}
.agent-content-modal .fruit-river-agent-lab .fruit-sorted-zone{
    background:linear-gradient(180deg,rgba(255,255,255,.88),rgba(255,249,219,.78));
}
.agent-content-modal .fruit-river-agent-lab>.agent-concept-checkpoint:not([hidden]){
    margin:0;
    position:absolute;
    z-index:80;
    inset:92px 70px 62px;
    overflow:hidden;
    background:#fff;
    box-shadow:0 18px 55px rgba(34,41,70,.24);
}
@media(max-width:700px){
    .agent-rich-preview-card{grid-template-columns:92px minmax(0,1fr)}.agent-rich-preview-thumb{width:92px}.agent-rich-preview-card>button{grid-column:1/-1;width:100%}
}

/* K12 AI 通识通用动画剧本：只渲染白名单节点与动作，不接收外部 HTML。 */
.generic-storyboard-lab{height:100%;max-width:100%;position:relative;display:grid;grid-template-rows:60px 36px minmax(150px,1fr) 36px 88px 42px;overflow:hidden;box-sizing:border-box}.generic-storyboard-lab>header{padding:9px 16px}.generic-storyboard-lab>header h2{margin:3px 0;font-size:15px}.generic-storyboard-lab>header p{font-size:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.generic-storyboard-lab>.agent-grade-banner{min-height:0;padding:6px 16px}.generic-storyboard-stage{min-height:0;padding:10px 18px;display:grid;grid-template-rows:minmax(0,1fr) auto;gap:7px;background:radial-gradient(circle at 50% 30%,#F4F1FF 0,#F7FAFD 48%,#EEF4FA 100%)}.generic-story-nodes{min-height:0;display:flex;align-items:center;justify-content:center;gap:13px}.generic-story-node{min-width:108px;max-width:150px;min-height:68px;padding:10px;position:relative;display:flex;align-items:center;gap:8px;border:2px solid #DDE2EC;border-radius:15px;background:rgba(255,255,255,.94);box-shadow:0 8px 20px rgba(48,59,91,.06);transition:transform .3s,border-color .3s,box-shadow .3s,opacity .3s}.generic-story-node>i{width:24px;height:24px;flex:0 0 auto;display:grid;place-items:center;border-radius:8px;color:#6254D8;background:#ECE9FF;font-size:9px;font-style:normal;font-weight:900}.generic-story-node>div{min-width:0}.generic-story-node strong{display:block;color:#343B4E;font-size:10px;line-height:1.35}.generic-story-node small{margin-top:3px;display:block;color:#8A91A2;font-size:7px;line-height:1.35}.generic-story-node>em{width:20px;height:20px;position:absolute;right:-7px;top:-7px;display:none;place-items:center;border:3px solid #fff;border-radius:50%;color:#fff;background:#35B779;font-size:10px;font-style:normal}.generic-story-node.active{z-index:3;border-color:#6A5AE1;box-shadow:0 10px 28px rgba(91,73,205,.22),0 0 0 5px rgba(106,90,225,.1);transform:translateY(-5px) scale(1.04);animation:generic-node-breathe .85s ease-in-out infinite alternate}.generic-story-node.active>i{color:#fff;background:linear-gradient(135deg,#7767EA,#5949CA)}.generic-story-node.completed{border-color:#A9DDC9;background:#F1FBF6;opacity:.78}.generic-story-node.completed>em{display:grid}.generic-story-node.kind-input{border-style:dashed}.generic-story-node.kind-output{background:linear-gradient(145deg,#FFF9DF,#FFF)}.generic-story-edges{min-height:25px;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:5px}.generic-story-edges span{padding:4px 7px;border-radius:12px;color:#8890A2;background:#E8ECF2;font-size:6px;transition:.25s}.generic-story-edges span:before{content:attr(data-story-edge-from);margin-right:3px}.generic-story-edges span:after{content:" → " attr(data-story-edge-to);margin-left:3px}.generic-story-edges span.active{color:#fff;background:#6656E3;box-shadow:0 5px 12px rgba(86,71,198,.22);transform:translateY(-2px)}.generic-story-edges span.completed{color:#287B58;background:#E4F7EE}.generic-storyboard-stage.layout-tree .generic-story-nodes,.generic-storyboard-stage.layout-groups .generic-story-nodes{display:grid;grid-template-columns:repeat(3,minmax(108px,150px));align-content:center}.generic-storyboard-stage.layout-cycle .generic-story-nodes{gap:20px}.generic-storyboard-stage.layout-cycle .generic-story-node{border-radius:42px}.generic-story-detail{min-height:0;grid-template-columns:1.35fr .65fr}.generic-story-detail>section{min-height:0;padding:8px 14px;overflow:hidden}.generic-story-detail p{min-height:0;margin:3px 0;font-size:8px}.generic-story-state{display:flex;align-items:center;justify-content:space-between;gap:12px}.generic-story-state span{color:#8A91A2;font-size:7px}.generic-story-state b{color:#5C4ED1;font-size:14px}.generic-story-source{margin-top:4px;display:block;color:#9AA0AF;font-size:6px}.generic-storyboard-lab>.agent-concept-controls{min-height:0;padding:5px 14px}.generic-storyboard-lab>.agent-concept-checkpoint:not([hidden]){position:absolute;z-index:40;inset:70px 70px 48px;overflow:hidden;border:1px solid #DCD8F8;border-radius:17px;background:rgba(255,255,255,.98);box-shadow:0 20px 60px rgba(31,38,64,.24)}@keyframes generic-node-breathe{to{transform:translateY(-5px) scale(1.075)}}.grade-elementary .generic-story-node strong{font-size:12px}.grade-elementary .generic-story-node small{font-size:7px}.grade-high .generic-storyboard-stage{background:linear-gradient(145deg,#F5F7FB,#EEF1F8)}.grade-high .generic-story-node{border-radius:9px}.grade-high .generic-story-node strong{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}

/* Animation Lego runtime */
.animation-lego-stage{min-width:0;min-height:0;position:relative;overflow:hidden;color:#314052;background:#F4F7FB}.lego-object-layer{position:absolute;z-index:12;display:flex;align-items:center;justify-content:center;gap:10px}.lego-object{min-width:104px;max-width:145px;min-height:62px;padding:8px 10px;position:relative;display:flex;align-items:center;gap:7px;border:2px solid rgba(106,119,145,.24);border-radius:13px;background:rgba(255,255,255,.94);box-shadow:0 7px 18px rgba(43,56,80,.08);transition:.35s}.lego-object-icon{width:28px;height:28px;flex:0 0 auto;display:grid;place-items:center;border-radius:9px;color:#fff;background:var(--lego-accent);font-size:12px;font-weight:900}.lego-object>div{min-width:0}.lego-object strong{display:block;font-size:9px;line-height:1.3}.lego-object small{margin-top:3px;display:block;color:#8991A2;font-size:6px;line-height:1.3}.lego-object em{width:17px;height:17px;position:absolute;right:-5px;top:-6px;display:none;place-items:center;border:2px solid #fff;border-radius:50%;color:#fff;background:#36B576;font-size:9px;font-style:normal}.lego-object.active{z-index:5;border-color:#FFD04E;box-shadow:0 0 0 5px rgba(255,208,78,.2),0 10px 24px rgba(57,68,91,.15);transform:translateY(-5px) scale(1.06)}.lego-object.completed{border-color:#67C99B;background:#ECFAF3;opacity:.72}.lego-object.completed em{display:grid}.lego-connections{position:absolute;z-index:10;left:28%;right:3%;bottom:8px;display:flex;justify-content:center;flex-wrap:wrap;gap:5px}.lego-connections span{padding:3px 7px;border-radius:10px;color:#687487;background:rgba(255,255,255,.85);font-size:6px}.lego-connections span.active{color:#fff;background:var(--lego-accent);animation:lego-signal .65s ease-in-out infinite alternate}.lego-story-banner{position:absolute;z-index:15;top:8px;left:12px;padding:7px 11px;display:flex;flex-direction:column;border:2px solid rgba(255,255,255,.7);border-radius:13px;color:#31516A;background:rgba(255,255,255,.88);box-shadow:0 6px 14px rgba(61,90,109,.11)}.lego-story-banner span{font-size:9px;font-weight:900}.lego-story-banner b{margin-top:2px;font-size:7px}.lego-actors{position:absolute;z-index:13;left:12px;bottom:7px;width:225px;height:145px}.lego-actor{position:absolute;bottom:0;text-align:center}.lego-actor svg{height:118px;display:block;filter:drop-shadow(0 6px 7px rgba(41,57,75,.15))}.lego-actor span{padding:2px 7px;border-radius:8px;color:#536274;background:rgba(255,255,255,.88);font-size:6px}.lego-actor.actor-0{left:0}.lego-actor.actor-1{right:0;transform:scale(.8);transform-origin:bottom}.lego-sky{position:absolute;inset:0;background:linear-gradient(#DDF3FF 0 58%,#CDE9BE 58%)}.lego-sky i{width:65px;height:19px;position:absolute;top:27px;left:40%;border-radius:20px;background:#fff;box-shadow:20px -8px 0 1px #fff,41px 1px 0 -2px #fff}.lego-sky i+ i{top:48px;left:73%;transform:scale(.7)}.lego-forest{position:absolute;inset:38% 0 0}.lego-forest i{width:32px;height:76px;position:absolute;left:4%;bottom:0;background:#8B633F}.lego-forest i:before{width:76px;height:76px;position:absolute;left:-22px;top:-45px;border-radius:50%;background:#64B979;box-shadow:-22px 17px #73C686,25px 19px #4FA967;content:""}.lego-forest i:nth-child(2){left:43%;transform:scale(.7)}.lego-forest i:nth-child(3){left:91%;transform:scale(.85)}.lego-post-office{width:118px;height:78px;position:absolute;right:4%;bottom:20px;border-radius:12px 12px 4px 4px;color:#fff;background:#E98464;box-shadow:inset 0 -8px rgba(135,72,54,.14)}.lego-post-office:before{position:absolute;inset:-24px -8px auto;border-left:67px solid transparent;border-right:67px solid transparent;border-bottom:35px solid #A95A4A;content:""}.lego-post-office b{position:absolute;top:11px;left:26px;font-size:8px}.lego-post-office span{position:absolute;left:43px;bottom:9px;font-size:27px}.lego-road{height:38px;position:absolute;left:13%;right:0;bottom:0;background:linear-gradient(8deg,#D2BA8D,#E3D2AD);clip-path:polygon(0 55%,100% 0,100% 100%,0 100%)}.lego-class-board{position:absolute;top:15px;left:26%;right:4%;height:54px;padding:9px 14px;display:flex;flex-direction:column;border:8px solid #D59D65;border-radius:5px;color:#E8FFF5;background:#356E60}.lego-class-board b{font-size:10px}.lego-class-board span{margin-top:5px;font-size:7px}.lego-class-floor{position:absolute;inset:0;background:linear-gradient(#FFF5DC 0 67%,#E6CFA8 67%);z-index:-1}.lego-station-sign{position:absolute;top:15px;left:30px;padding:7px 15px;border:5px solid #875E42;border-radius:8px;color:#875E42;background:#FFF0B6;font-size:10px;font-weight:900}.lego-rail{height:8px;position:absolute;left:24%;right:0;bottom:26px;background:#596171;box-shadow:0 17px #596171}.lego-rail:after{position:absolute;inset:-4px 0 -21px;background:repeating-linear-gradient(90deg,transparent 0 23px,#596171 24px 30px,transparent 31px 48px);content:""}.lego-hills{position:absolute;inset:0;background:linear-gradient(#DFF4FF 0 67%,#BFE1A7 67%);z-index:-1}.lego-city{position:absolute;inset:0;background:linear-gradient(#DBF1FF 0 64%,#A9D79C 64%)}.lego-city i{width:52px;height:75px;position:absolute;bottom:34%;left:5%;background:#7B88BC;box-shadow:inset 8px 0 rgba(255,255,255,.15)}.lego-city i:nth-child(2){left:20%;height:55px;background:#E59B67}.lego-city i:nth-child(3){left:42%;height:88px}.lego-city i:nth-child(4){left:58%;height:63px;background:#68B29D}.lego-city i:nth-child(5){left:76%;height:94px}.lego-city i:nth-child(6){left:91%;height:49px;background:#E59B67}.lego-agent-road{position:absolute;inset:67% 0 0;background:#596777}.lego-agent-road:after{height:3px;position:absolute;left:0;right:0;top:48%;background:repeating-linear-gradient(90deg,#fff 0 28px,transparent 29px 50px);content:""}.lego-goal-flag{position:absolute;right:26px;bottom:43px;color:#fff;font-size:8px}.lego-goal-flag:before{display:block;color:#F5C44C;font-size:34px;content:"⚑"}.lego-water{position:absolute;inset:0;background:linear-gradient(#DDF5FF 0 28%,#77CDE8 28%)}.lego-island{width:150px;height:58px;position:absolute;bottom:22px;display:grid;place-items:center;border-radius:50%;font-size:8px;font-weight:900}.lego-island.red{left:31%;color:#9C4850;background:#F6C0AF;box-shadow:0 8px #DFA088}.lego-island.blue{right:7%;color:#27768C;background:#B6E3E9;box-shadow:0 8px #88CAD4}.lego-lab-grid{position:absolute;inset:0;background-color:#F5F7FB;background-image:linear-gradient(rgba(93,104,132,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(93,104,132,.08) 1px,transparent 1px);background-size:24px 24px}.lego-lab-title{position:absolute;top:8px;left:12px;color:#8A93A7;font:700 7px/1 ui-monospace,SFMono-Regular,monospace;letter-spacing:.08em}

.band-elementary .lego-object-layer{left:245px;right:18px;top:45px;bottom:31px;flex-wrap:wrap}.band-elementary .lego-object{min-width:90px;max-width:125px;min-height:54px;border:0;border-radius:22px}.band-elementary .lego-object-icon{width:34px;height:34px;border-radius:50%;font-size:15px}.band-elementary .lego-object strong{font-size:9px}.band-elementary .lego-object small{display:none}.blueprint-forest_post_office .lego-object-layer{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(2,1fr)}.blueprint-forest_post_office .lego-object:nth-child(1){grid-column:1}.blueprint-forest_post_office .lego-object:nth-child(2){grid-column:2}.blueprint-forest_post_office .lego-object:nth-child(3){grid-column:2;grid-row:2}.blueprint-forest_post_office .lego-object:nth-child(4){grid-column:3;grid-row:1}.blueprint-forest_post_office .lego-object:nth-child(5){grid-column:3;grid-row:2}.blueprint-token_train_station .lego-object{border-radius:8px;background:#FFF8D7;box-shadow:0 7px #C39B5C}.blueprint-agent_city .lego-object-layer{display:grid;grid-template-columns:1fr 1fr}.blueprint-agent_city .lego-object{border-radius:50px}.blueprint-clustering_islands .lego-object-layer{display:grid;grid-template-columns:repeat(3,1fr)}.blueprint-clustering_islands .lego-object:nth-child(-n+2){background:#FFE3E0}.blueprint-clustering_islands .lego-object:nth-child(n+3):nth-child(-n+4){background:#DDF7FA}

.band-middle .lego-object-layer,.band-high .lego-object-layer{inset:30px 18px 32px}.band-middle .lego-object.kind-decision{border-radius:5px;transform:rotate(2deg)}.band-middle .lego-object.kind-decision.active{transform:translateY(-5px) scale(1.06) rotate(2deg)}.blueprint-training_workbench .lego-object-layer,.blueprint-token_probability_lab .lego-object-layer,.blueprint-optimizer_console .lego-object-layer,.blueprint-transformer_decoder .lego-object-layer{justify-content:space-between}.blueprint-training_workbench:after,.blueprint-optimizer_console:after{height:7px;position:absolute;left:5%;right:5%;bottom:42px;border-radius:6px;background:repeating-linear-gradient(90deg,#8F99AC 0 20px,#C8CDD7 21px 34px);content:""}.blueprint-token_probability_lab .lego-object:nth-child(2):after,.blueprint-token_probability_lab .lego-object:nth-child(3):after,.blueprint-token_probability_lab .lego-object:nth-child(4):after{height:5px;margin-top:5px;display:block;border-radius:4px;background:var(--lego-accent);content:""}.blueprint-token_probability_lab .lego-object:nth-child(2):after{width:48%}.blueprint-token_probability_lab .lego-object:nth-child(3):after{width:31%}.blueprint-token_probability_lab .lego-object:nth-child(4):after{width:21%}.blueprint-agent_control_room .lego-object-layer,.blueprint-agent_mdp_lab .lego-object-layer{left:18%;right:18%;display:grid;grid-template-columns:1fr 1fr}.blueprint-agent_control_room .lego-object,.blueprint-agent_mdp_lab .lego-object{border-radius:50px}.blueprint-cluster_lab .lego-object-layer,.blueprint-cluster_math_lab .lego-object-layer{display:grid;grid-template-columns:repeat(3,1fr)}.blueprint-cluster_lab .lego-object:nth-child(odd),.blueprint-cluster_math_lab .lego-object:nth-child(odd){transform:translateY(-13px)}.blueprint-cluster_lab .lego-object.active:nth-child(odd),.blueprint-cluster_math_lab .lego-object.active:nth-child(odd){transform:translateY(-18px) scale(1.06)}

.band-high.animation-lego-stage{color:#D7DDF0;background:#171D2D}.band-high .lego-lab-grid{background-color:#171D2D;background-image:linear-gradient(rgba(128,143,185,.12) 1px,transparent 1px),linear-gradient(90deg,rgba(128,143,185,.12) 1px,transparent 1px)}.band-high .lego-object{border-color:#3D4864;color:#E3E8F7;background:#252D42;box-shadow:none;border-radius:7px}.band-high .lego-object small{color:#96A3BE}.band-high .lego-object-icon{border-radius:5px}.band-high .lego-object.completed{border-color:#347B61;background:#203A35}.band-high .lego-connections span{color:#B4BED4;background:#2B344A}.band-high .lego-lab-title{color:#7E8BA9}

.lego-learning-panel{grid-template-columns:1fr 1fr}.lego-learning-panel>section{min-height:0;padding:7px 12px;overflow:hidden}.lego-learning-panel header{color:#7D8597;font-size:7px;font-weight:800}.lego-story-state p{margin:5px 0;color:#4F6072;font-size:9px;font-weight:700}.lego-trace-code ol,.lego-model-code ol{margin:3px 0 0;padding:0;list-style:none;counter-reset:lego-code}.lego-trace-code li,.lego-model-code li{padding:1px 5px;color:#637087;font:7px/1.35 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre;counter-increment:lego-code}.lego-trace-code li:before,.lego-model-code li:before{width:16px;display:inline-block;color:#B0B6C3;content:counter(lego-code)}.lego-trace-code li.active,.lego-model-code li.active{color:#fff;background:#6656E3}.lego-model-code{background:#1D2436}.lego-model-code header{color:#9EA9C1}.lego-model-code li{color:#BFC9DE}.lego-model-analysis{background:#F7F8FB}.lego-formula{margin:3px 0;padding:5px 7px;border-left:3px solid #6656E3;color:#3E4760;background:#ECEAFC;font:8px/1.3 ui-monospace,SFMono-Regular,Menlo,monospace}.lego-metrics{display:flex;gap:4px}.lego-metrics span{min-width:0;padding:3px 5px;flex:1;border-radius:5px;background:#E9EDF4}.lego-metrics small{display:block;color:#818A9E;font-size:5px}.lego-metrics b{margin-top:2px;display:block;color:#3C465D;font-size:6px}.agent-concept-controls [data-lego-sound].muted{color:#8D94A3;background:#ECEEF2}@keyframes lego-signal{to{transform:translateY(-2px);box-shadow:0 0 12px var(--lego-accent)}}@keyframes lego-path-move{50%{transform:translateX(12px) translateY(-8px)}}.lego-object.motion-path_move.active{animation:lego-path-move .75s ease-in-out infinite}.lego-object.motion-compare.active{animation:generic-node-breathe .6s ease-in-out infinite alternate}
.animation-lego-lab.grade-elementary{grid-template-rows:60px 36px minmax(190px,1fr) 36px 70px 42px}.animation-lego-lab.grade-middle{grid-template-rows:60px 36px minmax(170px,1fr) 36px 100px 42px}.animation-lego-lab.grade-high{grid-template-rows:60px 36px minmax(150px,1fr) 36px 120px 42px}.teacher-lego-preview{width:100%;height:100%;overflow:hidden}.teacher-lego-preview .animation-lego-stage{width:100%;height:100%;min-height:250px}

/* DeepSeek 乐高拼搭结果：节点坐标、素材和动作来自已校验的 assembly。 */
.lego-object-layer.lego-custom-assembly{inset:0;display:block}
.lego-custom-assembly .lego-object{position:absolute;left:var(--lego-x);top:var(--lego-y);transform:translate(-50%,-50%)}
.lego-custom-assembly .lego-object.active{transform:translate(-50%,calc(-50% - 5px)) scale(1.06)}
.lego-custom-assembly .lego-object.motion-path_move.active{animation:lego-custom-path-move .75s ease-in-out infinite}
.lego-props{max-width:46%;position:absolute;z-index:11;right:8px;bottom:8px;display:flex;justify-content:flex-end;flex-wrap:wrap;gap:4px}
.lego-props span{padding:3px 6px;border:1px solid rgba(102,86,227,.2);border-radius:9px;color:#6656E3;background:rgba(255,255,255,.82);font:6px/1.2 ui-monospace,SFMono-Regular,monospace}
.lego-actor.actor-2{left:92px;transform:scale(.7);transform-origin:bottom}
.lego-object.motion-update_value.active{animation:generic-node-breathe .45s ease-in-out infinite alternate}
@keyframes lego-custom-path-move{50%{transform:translate(calc(-50% + 12px),calc(-50% - 8px))}}

/* 原子素材场景图运行时：不依赖任何主题蓝图。 */
.atomic-scene-graph{isolation:isolate;background:#f5f7fb}
.atomic-background{position:absolute;z-index:0;inset:0;overflow:hidden}
.background-blank_canvas .atomic-background{background:linear-gradient(145deg,#f8fafc,#eef2f7)}
.background-story_world .atomic-background{background:linear-gradient(#dff4ff 0 58%,#cfe9bd 58%)}
.background-ai_lab .atomic-background{background:radial-gradient(circle at 50% 30%,#f0ecff,#eef5fb 65%,#e4ebf3)}
.background-data_lab .atomic-background{background-color:#f3f7fb;background-image:linear-gradient(rgba(90,107,145,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(90,107,145,.08) 1px,transparent 1px);background-size:22px 22px}
.background-dark_model_lab .atomic-background{background-color:#161d2d;background-image:radial-gradient(circle at 75% 25%,rgba(111,91,220,.22),transparent 38%),linear-gradient(rgba(130,145,187,.09) 1px,transparent 1px),linear-gradient(90deg,rgba(130,145,187,.09) 1px,transparent 1px);background-size:auto,24px 24px,24px 24px}
.atomic-background i{width:110px;height:110px;position:absolute;border:1px solid rgba(103,87,218,.13);border-radius:50%;animation:atomic-orbit 8s linear infinite}
.atomic-background i:nth-child(1){left:8%;top:16%}.atomic-background i:nth-child(2){right:10%;bottom:8%;width:160px;height:160px;animation-duration:12s}.atomic-background i:nth-child(3){left:48%;top:48%;width:65px;height:65px;animation-direction:reverse}
.atomic-scene-title{position:absolute;z-index:30;left:10px;top:8px;display:flex;flex-direction:column;pointer-events:none}.atomic-scene-title span{color:#7566dd;font-size:6px;font-weight:900;letter-spacing:.12em}.atomic-scene-title b{margin-top:2px;color:#374158;font-size:9px}.background-dark_model_lab .atomic-scene-title b{color:#e2e7f5}
.atomic-entity-layer{position:absolute;z-index:10;inset:0}.atomic-entity{width:var(--entity-w);height:var(--entity-h);min-width:52px;min-height:40px;padding:5px;position:absolute;z-index:var(--entity-z);left:var(--entity-x);top:var(--entity-y);display:flex;align-items:center;justify-content:center;flex-direction:column;box-sizing:border-box;border:2px solid rgba(100,112,143,.25);border-radius:11px;color:#344056;background:rgba(255,255,255,.94);box-shadow:0 7px 18px rgba(43,56,80,.1);transform:translate(-50%,-50%);transition:left .65s ease,top .65s ease,opacity .3s,transform .3s,border-color .3s}.atomic-entity>small{position:absolute;left:5px;top:3px;color:#8992a4;font-size:5px}.atomic-entity>span{max-width:100%;font-size:8px;font-weight:800;text-align:center}.atomic-entity>b{margin-top:3px;color:#6757d7;font-size:11px}.atomic-entity.is-hidden,.atomic-connection.is-hidden{opacity:0;pointer-events:none}.atomic-asset-icon{width:25px;height:25px;margin-bottom:3px;display:grid;place-items:center;border-radius:8px;color:#fff;background:#6859da;font-size:10px;font-style:normal}.atomic-character{height:70%;min-height:34px}.atomic-character svg{width:100%;height:100%}.atomic-entity.asset-student,.atomic-entity.asset-teacher,.atomic-entity.asset-robot,.atomic-entity.asset-model{border:0;background:transparent;box-shadow:none}.atomic-entity.asset-token_card{border-color:#8a6de1;background:#f2edff}.atomic-entity.asset-output_node{border-color:#54b987;background:#eaf9f1}.atomic-entity.asset-decision_node{border-radius:24px;border-color:#e2a640;background:#fff6dd}.atomic-entity.asset-thought_bubble{border-radius:28px}.atomic-entity.asset-formula_card{font-family:ui-monospace,SFMono-Regular,monospace}.atomic-value-bar{width:84%;height:6px;margin-top:4px;overflow:hidden;border-radius:5px;background:#e1e5ee}.atomic-value-bar u{height:100%;display:block;border-radius:5px;background:#7564e5;transition:width .5s}.atomic-connections{position:absolute;z-index:5;inset:0;width:100%;height:100%;overflow:visible}.atomic-connection{transition:opacity .3s}.atomic-connection line{stroke:#8f98aa;stroke-width:.65;marker-end:url(#atomicArrow)}.atomic-connection text{fill:#768096;font-size:2px;text-anchor:middle}.atomic-connection.style-probability line{stroke:#8268dc;stroke-dasharray:2 1}.atomic-connection.style-selected line{stroke:#35ae77;stroke-width:1.1}.atomic-connection.style-feedback line{stroke:#e58d43;stroke-dasharray:1 1}.atomic-connection.active line{stroke:#ffbd35;stroke-width:1.4;filter:drop-shadow(0 0 2px #ffd96f)}
.atomic-entity.operation-highlight,.atomic-entity.operation-compare{border-color:#ffd04e;box-shadow:0 0 0 5px rgba(255,208,78,.2),0 10px 24px rgba(57,68,91,.15);transform:translate(-50%,-55%) scale(1.06)}
.atomic-entity.operation-show{animation:atomic-enter .45s ease-out}.atomic-entity.operation-move{box-shadow:0 0 0 4px rgba(102,86,227,.15)}.atomic-entity.operation-complete{border-color:#55bd89;background:#ebfaf2}.atomic-entity.operation-speak{border-color:#6c5cdd;animation:atomic-speak .7s ease-in-out infinite alternate}.atomic-entity.operation-update_value{animation:atomic-value .5s ease-in-out}
.background-dark_model_lab .atomic-entity{border-color:#3d4964;color:#e2e7f4;background:rgba(37,45,66,.95)}.background-dark_model_lab .atomic-entity>small{color:#9ca8c0}.background-dark_model_lab .atomic-connections text{fill:#bdc6d9}
.atomic-asset-preview{width:100%;height:100%;position:relative}
@keyframes atomic-enter{from{opacity:0;transform:translate(-50%,-40%) scale(.75)}}@keyframes atomic-speak{to{transform:translate(-50%,-56%) scale(1.04)}}@keyframes atomic-value{50%{transform:translate(-50%,-50%) scale(1.1)}}@keyframes atomic-orbit{to{transform:rotate(360deg)}}

/* 学段原生动画：小学绘本、初中数据可视化、高中模型分析。 */
.grade-story-stage{min-height:260px;background:#dff4ff}.story-page{position:absolute;inset:0;display:none;overflow:hidden}.story-page.active{display:block;animation:story-page-enter .45s ease-out}.story-background-forest_morning{background:linear-gradient(#cceeff 0 60%,#b9df95 60%)}.story-background-classroom{background:linear-gradient(#fff1cf 0 72%,#d7b98a 72%)}.story-background-playground{background:linear-gradient(#d9f1ff 0 63%,#9ed58d 63%)}.story-world{position:absolute;inset:0 0 48px}.story-world:before{position:absolute;left:-5%;right:-5%;bottom:-25px;height:78px;border-radius:50% 50% 0 0;background:rgba(89,166,91,.2);content:""}.story-page>p{position:absolute;z-index:20;left:50%;bottom:9px;margin:0;padding:8px 20px;border-radius:20px;color:#405168;background:rgba(255,255,255,.94);box-shadow:0 8px 20px rgba(45,67,88,.12);font-size:12px;font-weight:800;transform:translateX(-50%);white-space:nowrap}.story-page-number{position:absolute;z-index:25;right:12px;top:10px;padding:4px 9px;border-radius:12px;color:#6d5bd5;background:#fff;font-size:8px;font-weight:900}.story-character{position:absolute;z-index:12;bottom:18px;display:flex;align-items:center;flex-direction:column;transition:.5s}.story-character.position-left{left:11%}.story-character.position-center{left:50%;transform:translateX(-50%)}.story-character.position-right{right:11%}.story-character.position-top{left:50%;top:8%;bottom:auto;transform:translateX(-50%)}.story-character.position-bottom{left:50%;bottom:3%;transform:translateX(-50%)}.story-character>i{width:74px;height:74px;display:grid;place-items:center;border:5px solid #fff;border-radius:50%;background:color-mix(in srgb,var(--character-color) 25%,#fff);box-shadow:0 10px 22px rgba(45,61,79,.18);font-size:42px;font-style:normal}.story-character>b{margin-top:4px;padding:3px 9px;border-radius:10px;color:#4a5568;background:#fff;font-size:9px}.story-character>span{max-width:130px;position:absolute;left:62px;top:-6px;padding:7px 10px;border:2px solid #e8e3ff;border-radius:15px 15px 15px 3px;color:#4d456d;background:#fff;font-size:9px;font-weight:800}.story-character.action-enter{animation:story-character-enter .7s cubic-bezier(.2,.8,.3,1.2)}.story-character.action-think>i{animation:story-think 1s ease-in-out infinite alternate}.story-character.action-celebrate{animation:story-celebrate .7s ease-in-out infinite alternate}.story-prop{position:absolute;z-index:8;display:flex;align-items:center;flex-direction:column}.story-prop.position-left{left:25%;top:28%}.story-prop.position-center{left:50%;top:25%;transform:translateX(-50%)}.story-prop.position-right{right:25%;top:28%}.story-prop.position-top{left:50%;top:8%;transform:translateX(-50%)}.story-prop.position-bottom{left:50%;bottom:5%;transform:translateX(-50%)}.story-prop i{font-size:38px;font-style:normal}.story-prop span{padding:4px 9px;border-radius:10px;background:#fff;font-size:9px;font-weight:800}.story-options{position:absolute;z-index:18;left:50%;top:24%;display:flex;gap:8px;transform:translateX(-50%)}.story-options span{padding:9px 13px;border:2px solid #fff;border-radius:15px;color:#554d70;background:rgba(255,255,255,.94);box-shadow:0 7px 16px rgba(55,65,90,.11);font-size:10px;font-weight:900}.story-options span.selected{border-color:#ffbe3f;background:#fff4c8;transform:translateY(-5px)}
.data-viz-stage{min-height:240px;padding:34px 14px 12px;box-sizing:border-box;background:#f3f7fb}.data-background-grid_tech{background-color:#f5f8fc;background-image:linear-gradient(rgba(95,108,142,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(95,108,142,.07) 1px,transparent 1px);background-size:22px 22px}.data-background-lab{background:radial-gradient(circle at 60% 20%,#e9e5ff,#f4f8fb 55%,#e8eff6)}.data-viz-stage>header,.model-graph-stage>header{position:absolute;z-index:10;left:13px;top:9px;display:flex;gap:8px;align-items:baseline}.data-viz-stage>header span,.model-graph-stage>header span{color:#7060d8;font-size:6px;font-weight:900;letter-spacing:.12em}.data-viz-stage>header b,.model-graph-stage>header b{font-size:11px}.data-widget-grid{height:100%;display:grid;grid-template-columns:1.55fr .75fr;grid-auto-rows:minmax(62px,1fr);gap:9px}.data-widget{min-width:0;padding:9px 11px;position:relative;overflow:hidden;border:2px solid transparent;border-radius:13px;background:rgba(255,255,255,.96);box-shadow:0 7px 18px rgba(48,62,88,.08);transition:.3s}.data-widget.active{z-index:3;border-color:#7564e5;box-shadow:0 0 0 5px rgba(117,100,229,.12),0 11px 24px rgba(58,49,126,.15);transform:translateY(-3px)}.data-widget>header{color:#59657a;font-size:8px;font-weight:900}.chart-widget{grid-row:span 2}.data-bars{height:calc(100% - 18px);display:flex;align-items:flex-end;justify-content:space-around;gap:8px}.data-bars>span{height:100%;min-width:34px;position:relative;display:flex;align-items:center;justify-content:flex-end;flex-direction:column}.data-bars b{width:25px;min-height:5px;border-radius:6px 6px 2px 2px;background:var(--bar-color);transition:.55s}.data-bars small{margin-top:3px;font-size:7px}.data-bars em{position:absolute;top:2px;color:#59657a;font-size:7px;font-style:normal}.control-widget input[type=range]{width:100%;margin-top:14px;accent-color:#6959d8}.control-widget>b{display:block;color:#6656d8;font-size:15px}.data-switch{margin-top:13px;display:flex;align-items:center;gap:8px}.data-switch i{width:34px;height:18px;position:relative;border-radius:12px;background:#ccd2de}.data-switch i:after{width:14px;height:14px;position:absolute;left:2px;top:2px;border-radius:50%;background:#fff;box-shadow:0 2px 5px #788;content:"";transition:.2s}.data-switch input{display:none}.data-switch input:checked+i{background:#6b5bdc}.data-switch input:checked+i:after{left:18px}.data-switch span{font-size:8px}.code-widget pre{max-height:72px;margin:6px 0 0;overflow:auto;color:#dbe5ff;background:#1d2638;font:7px/1.45 ui-monospace,SFMono-Regular,monospace}.card-widget strong{margin-top:12px;display:block;color:#6656d8;font-size:13px}
.model-graph-stage{min-height:240px;padding:35px 14px 12px;box-sizing:border-box;color:#dce4f5;background:#141b2b}.model-graph-stage>header b{color:#f1f4fb}.model-section-grid{height:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.model-section{min-width:0;padding:10px;overflow:auto;border:1px solid #34415d;border-radius:10px;background:#202a3e;transition:.3s}.model-section.active{border-color:#8e7aff;box-shadow:0 0 0 4px rgba(142,122,255,.15);transform:translateY(-3px)}.model-section>header{margin-bottom:7px;color:#9585ff;font-size:7px;font-weight:900;letter-spacing:.08em}.formula-section{grid-column:1/-1;display:flex;align-items:center;justify-content:center;flex-direction:column}.formula-section .katex{color:#f0f3ff;font-size:14px}.code-section pre{margin:0;color:#bfe4d5;font:8px/1.5 ui-monospace,SFMono-Regular,monospace;white-space:pre-wrap}.model-heatmap{display:grid;grid-template-columns:repeat(6,1fr);gap:3px}.model-heatmap i{aspect-ratio:1;border-radius:3px;background:color-mix(in srgb,#8c73ff calc(var(--heat)*100%),#263149);box-shadow:inset 0 0 0 1px rgba(255,255,255,.05)}
@keyframes story-page-enter{from{opacity:0;transform:translateX(25px)}}@keyframes story-character-enter{from{opacity:0;transform:translateX(-70px) scale(.7)}}@keyframes story-think{to{transform:translateY(-7px)}}@keyframes story-celebrate{to{transform:translateY(-9px) rotate(3deg)}}

/* 小学故事绘本：角色台词属于角色，旁白只承担场景说明。 */
.animation-lego-lab.engine-animation_story_script{grid-template-rows:64px 38px minmax(250px,1fr) 0 0 46px}
.engine-animation_story_script .lego-learning-panel{display:none}
.engine-animation_story_script>header h2{font-size:18px}
.engine-animation_story_script>header p{display:none}
.engine-animation_story_script .concept-step-bar{display:none}
.engine-animation_story_script>.agent-grade-banner b{font-size:10px}
.engine-animation_story_script>.agent-grade-banner span{font-size:10px}
.engine-animation_story_script .concept-step-bar b{font-size:12px}
.engine-animation_story_script .concept-step-bar span{font-size:10px}
.engine-animation_story_script .agent-concept-controls button{font-size:10px}
.engine-animation_story_script .grade-story-stage{min-height:250px}
.engine-animation_story_script .story-world{inset:10px 0 54px}
.engine-animation_story_script .story-narration{display:none}
.story-page>.story-narration{max-width:calc(100% - 120px);left:18px;top:11px;bottom:auto;padding:7px 14px;display:flex;align-items:center;gap:8px;border-radius:12px;font-size:14px;line-height:1.4;transform:none;white-space:normal}
.story-narration>i{padding:3px 7px;border-radius:8px;color:#fff;background:#7c6be8;font-size:10px;font-style:normal;white-space:nowrap}
.story-narration>span{font-weight:800}
.story-page-number{font-size:10px}
.story-page-number b{max-width:170px;margin-left:6px;display:inline-block;overflow:hidden;color:#5b4cc4;text-overflow:ellipsis;vertical-align:middle;white-space:nowrap}
.story-character>i{width:88px;height:88px;font-size:50px}
.story-character>b{margin-top:6px;padding:4px 11px;font-size:12px}
.story-character .story-bubble{width:max-content;min-width:92px;max-width:190px;position:absolute;z-index:30;left:74px;top:-28px;padding:11px 15px;border:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);border-radius:20px 20px 20px 5px;color:#38324f;background:#fff;box-shadow:0 10px 26px rgba(42,50,73,.2);font-size:14px;font-weight:900;line-height:1.45;text-align:left}
.story-character .story-bubble:after{width:14px;height:14px;position:absolute;left:-9px;bottom:12px;border-left:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);border-bottom:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);background:#fff;content:"";transform:rotate(45deg)}
.story-character .story-bubble.thought{border-style:dashed;border-radius:24px}
.story-character .story-bubble.thought:before{margin-right:5px;content:"💭"}
.story-character.position-right .story-bubble{right:74px;left:auto;border-radius:20px 20px 5px 20px}
.story-character.position-right .story-bubble:after{right:-9px;left:auto;border:0;border-top:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);border-right:3px solid color-mix(in srgb,var(--character-color) 48%,#fff)}
.story-character.position-center .story-bubble,.story-character.position-top .story-bubble,.story-character.position-bottom .story-bubble{left:50%;top:-62px;transform:translateX(-50%);border-radius:20px}
.story-character.position-center .story-bubble:after,.story-character.position-top .story-bubble:after,.story-character.position-bottom .story-bubble:after{left:50%;bottom:-9px;border:0;border-right:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);border-bottom:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);transform:translateX(-50%) rotate(45deg)}
.story-character.is-auto-placed{right:auto;left:var(--character-x);top:auto;bottom:18px;transform:translateX(-50%)}
.story-character.is-auto-placed.layout-left .story-bubble{right:auto;left:74px;border-radius:20px 20px 20px 5px;transform:none}
.story-character.is-auto-placed.layout-left .story-bubble:after{right:auto;left:-9px;bottom:12px;border:0;border-left:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);border-bottom:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);transform:rotate(45deg)}
.story-character.is-auto-placed.layout-right .story-bubble{right:74px;left:auto;border-radius:20px 20px 5px 20px;transform:none}
.story-character.is-auto-placed.layout-right .story-bubble:after{right:-9px;left:auto;bottom:12px;border:0;border-top:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);border-right:3px solid color-mix(in srgb,var(--character-color) 48%,#fff);transform:rotate(45deg)}
.story-prop{transition:opacity .35s,visibility .35s,filter .35s}
.story-prop.is-auto-placed{right:auto!important;bottom:auto!important;left:var(--story-x)!important;top:var(--story-y)!important;transform:translate(-50%,-50%)}
.story-prop.is-layout-suppressed{display:none}
.story-prop i{font-size:48px}
.story-prop span{padding:6px 11px;font-size:12px}
.story-options{top:9%;align-items:center;flex-direction:column;gap:7px}
.story-options{max-width:58%;box-sizing:border-box}
.story-options>div{max-width:100%;display:flex;justify-content:center;flex-wrap:wrap}
.story-options>b{padding:4px 10px;border-radius:12px;color:#6657cf;background:rgba(255,255,255,.9);font-size:11px;box-shadow:0 5px 12px rgba(75,64,137,.1)}
.story-options>b i{color:#f0a81f;font-style:normal}
.story-options>div{gap:10px}
.story-options span{min-width:62px;padding:12px 17px;position:relative;border:3px solid #fff;font-size:14px;text-align:center;transition:opacity .25s,transform .32s,border-color .25s,background .25s}
.story-options span.selected{z-index:3;border-color:#26ad72;color:#155f43;background:#dff8eb;box-shadow:0 0 0 6px rgba(38,173,114,.16),0 10px 22px rgba(38,126,87,.2);transform:translateY(-7px) scale(1.08)}
.story-options span.selected:after{width:22px;height:22px;position:absolute;right:-9px;top:-11px;border:3px solid #fff;border-radius:50%;color:#fff;background:#20a968;font-size:13px;line-height:22px;content:"✓"}
.story-options.has-selection span:not(.selected){opacity:.48;transform:scale(.94)}
.story-prop.prop-text_card{z-index:15;min-width:250px}
.story-prop.prop-text_card.position-center{top:58%}
.story-prop.prop-text_card.position-top{top:43%}
.story-prop.prop-text_card.position-bottom{bottom:8%}
.story-prop.prop-text_card>i{display:none}
.story-prop.prop-text_card>span{min-width:230px;min-height:48px;padding:12px 20px;position:relative;display:flex;align-items:center;justify-content:center;gap:10px;box-sizing:border-box;border:3px solid #7565df;border-radius:16px;color:#352b6a;background:linear-gradient(145deg,#fff,#f2efff);font-size:18px;box-shadow:0 10px 24px rgba(76,65,145,.2)}
.story-prop.prop-text_card>span:before{position:absolute;left:12px;top:-14px;padding:2px 8px;border-radius:9px;color:#fff;background:#7565df;font-size:10px;content:"当前句子";box-shadow:0 3px 8px rgba(68,56,133,.18)}
.story-prop.prop-text_card.is-tokenized>span:before{content:"文字片段"}
.story-prop.prop-text_card>span em{padding:7px 13px;border:2px solid #9c8fe9;border-radius:12px;color:#463a84;background:#fff;font-size:17px;font-style:normal;box-shadow:0 5px 12px rgba(74,61,137,.12)}
.story-prop.prop-text_card>span i{color:#ef9b22;font-size:18px;font-style:normal;font-weight:900}
.story-symbol-prop{z-index:16}
.story-symbol-prop>i{width:82px;height:82px;display:grid;place-items:center;border:5px solid rgba(255,255,255,.9);border-radius:50%;background:radial-gradient(circle,#fff9c9,#ffd861);filter:drop-shadow(0 10px 14px rgba(212,151,35,.25));font-size:58px}
.story-symbol-prop>span{display:none}
.story-symbol-prop.position-bottom{left:72%;bottom:15%;transform:translateX(-50%)}
.story-symbol-prop.position-center{top:48%}
.story-world.is-crowded .story-prop:not(.prop-text_card)>i{font-size:40px}
.story-world.is-crowded .story-prop:not(.prop-text_card)>span{font-size:11px}
.story-character.is-auto-placed.action-celebrate{animation-name:story-celebrate-placed}
@keyframes story-celebrate-placed{to{transform:translate(-50%,-9px) rotate(3deg)}}
.story-character.is-hidden,.story-character.is-cast-hidden,.story-prop.is-hidden{opacity:0;visibility:hidden;transform:translateY(12px) scale(.88);pointer-events:none}
.story-bubble[hidden],.story-options[hidden]{display:none}
.story-options:not([hidden]){animation:story-options-enter .42s ease-out both}
.story-prop.is-updating{animation:story-prop-update .58s ease-out}
.story-prop.is-updating span{color:#fff;background:#6c5ce7;box-shadow:0 0 0 5px rgba(108,92,231,.15)}
.story-prop.is-revealing{animation:story-prop-reveal .62s cubic-bezier(.2,.8,.25,1.25)}
.story-prop.is-splitting>span em{animation:story-token-split .72s ease-out both}
.story-prop.is-splitting>span em:nth-of-type(2){animation-delay:.12s}
.story-prop.is-joining:after{position:absolute;z-index:30;left:calc(100% + 8px);top:8px;padding:7px 13px;border:3px solid #2eaf72;border-radius:14px;color:#166243;background:#e5faef;font-size:15px;font-weight:900;content:"＋ " attr(data-added-token);white-space:nowrap;animation:story-token-join .75s ease-out both}
@keyframes story-options-enter{from{opacity:0;transform:translate(-50%,12px) scale(.92)}}
@keyframes story-prop-update{50%{filter:drop-shadow(0 0 12px rgba(108,92,231,.65)) brightness(1.08)}}
@keyframes story-prop-reveal{from{opacity:0;filter:blur(5px) brightness(1.35)}65%{filter:blur(0) brightness(1.12)}}
@keyframes story-token-split{from{opacity:.35;transform:translateX(0) scale(.85)}50%{transform:translateX(-12px) scale(1.08)}}
@keyframes story-token-join{from{opacity:0;transform:translate(-22px,-10px) scale(.7)}70%{transform:translate(3px,0) scale(1.08)}to{opacity:1;transform:translate(0,0) scale(1)}}