/* course portal and course-scoped workspace */
.course-workspace-nav[hidden],#allCoursesNav[hidden]{display:none}.course-workspace-nav>p{margin:14px 11px 7px;color:#5e6688;font-size:7px;font-weight:800;letter-spacing:.12em}.course-workspace-nav #backToCourses{height:34px;color:#747d9e;font-size:8px}.course-portal-head,.course-workspace-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px}.course-portal-head h2,.course-workspace-heading h2{margin:6px 0 5px;font-size:25px}.course-portal-head p,.course-workspace-heading p{margin:0;color:var(--muted);font-size:9px}.course-portal-summary{margin:20px 0 12px;display:flex;align-items:center;gap:10px}.course-portal-summary strong{font-size:11px}.course-portal-summary span{color:var(--muted);font-size:8px}.course-portal-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.course-portal-grid .teacher-course-item{position:relative;min-height:190px;padding:0;display:grid;grid-template-columns:1fr auto;grid-template-rows:120px auto auto;overflow:hidden;border:1px solid var(--line);border-radius:15px;background:#fff;box-shadow:0 8px 24px rgba(28,32,62,.05)}.course-portal-grid .teacher-course-item:hover{transform:translateY(-3px);border-color:#d8d3fa;box-shadow:var(--shadow)}.course-portal-grid .teacher-course-manage{position:absolute;top:8px;right:8px;z-index:3}.course-portal-grid .teacher-course-manage-toggle{height:26px;padding:0 10px;display:flex;align-items:center;gap:6px;border-radius:8px;color:#fff;background:rgba(28,32,62,.48);backdrop-filter:blur(3px);font-size:10px;line-height:1;white-space:nowrap}.course-portal-grid .teacher-course-manage-toggle:hover{background:rgba(28,32,62,.72)}.course-portal-grid .teacher-course-menu{position:absolute;right:0;top:calc(100% + 5px);z-index:20;min-width:118px;padding:6px;display:none;flex-direction:column;border:1px solid var(--line);border-radius:10px;background:#fff;box-shadow:var(--shadow)}.course-portal-grid .teacher-course-menu.open{display:flex}.course-portal-grid .teacher-course-menu button{width:100%;padding:9px 10px;border-radius:7px;background:transparent;text-align:left;color:var(--ink);font-size:11px;white-space:nowrap}.course-portal-grid .teacher-course-menu button:hover{background:#f4f3fb}.course-portal-grid .teacher-course-menu button.danger{color:var(--red)}.course-portal-grid .course-mini-cover{width:100%;height:120px;grid-column:1/-1;border-radius:0;font-size:25px}.course-portal-grid .teacher-course-item>span:nth-child(2){padding:12px 14px 4px}.course-portal-grid .teacher-course-item strong{font-size:11px}.course-portal-grid .teacher-course-item small{font-size:7px}.course-portal-grid .teacher-course-item>em{margin:12px 12px 0 0;align-self:start}.course-builder.course-builder-workspace{grid-template-columns:280px minmax(0,1fr)}.course-workspace-heading>div:last-child{display:flex;gap:8px}.course-workspace-heading>div:last-child button{padding:10px 13px;border-radius:9px;color:var(--purple);background:var(--purple-soft);font-size:8px}.course-workspace-heading>div:last-child .primary-action{color:#fff;background:var(--purple)}.course-author-toolbar{margin-top:15px;padding:9px;display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:11px;background:#fff}.course-author-toolbar button{padding:7px 9px;border-radius:7px;color:#616779;background:#f5f5f8;font-size:7px}.course-author-toolbar button:hover{color:var(--purple);background:var(--purple-soft)}.course-author-toolbar>span{flex:1}@media(max-width:900px){.course-portal-grid{grid-template-columns:1fr 1fr}.course-builder.course-builder-workspace{grid-template-columns:1fr}.course-workspace-heading{align-items:flex-start;flex-direction:column}.course-author-toolbar{overflow:auto}}@media(max-width:560px){.course-portal-grid{grid-template-columns:1fr}.course-portal-head{align-items:flex-start;flex-direction:column}}

/* structured course builder */
.course-builder{margin-top:18px;display:grid;grid-template-columns:240px 250px minmax(420px,1fr);gap:12px;align-items:start}.course-library-panel,.course-outline-panel,.course-editor-panel{min-height:630px;overflow:hidden}.course-builder-head{height:49px;padding:0 14px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.course-builder-head strong{font-size:10px}.course-builder-head span{color:var(--muted);font-size:7px}.course-builder-head button{padding:6px 8px;border-radius:7px;color:var(--purple);background:var(--purple-soft);font-size:7px}.course-builder-head button:disabled{opacity:.4}.teacher-course-list{padding:9px;display:flex;flex-direction:column;gap:6px}.teacher-course-item{width:100%;padding:9px;display:grid;grid-template-columns:37px minmax(0,1fr) auto;align-items:center;gap:8px;border:1px solid transparent;border-radius:10px;background:#fafafd;text-align:left}.teacher-course-item:hover,.teacher-course-item.active{border-color:#d9d4fa;background:#f6f4ff}.course-mini-cover{width:37px;height:37px;display:grid;place-items:center;border-radius:9px;color:#fff;background:linear-gradient(145deg,#7264ec,#5041c6)}.course-mini-cover.has-image{background-position:center;background-size:cover}.teacher-course-item>span:nth-child(2){display:flex;min-width:0;flex-direction:column}.teacher-course-item strong{overflow:hidden;font-size:8px;white-space:nowrap;text-overflow:ellipsis}.teacher-course-item small{margin-top:4px;color:var(--muted);font-size:6px}.teacher-course-item>em{padding:4px 5px;border-radius:6px;color:#8a6a31;background:#fff2da;font-size:6px;font-style:normal}.teacher-course-item>em.published{color:#27795b;background:#e5f7ee}.outline-course-title{padding:13px 14px;display:flex;flex-direction:column;background:#f8f7ff}.outline-course-title strong{font-size:9px}.outline-course-title small{margin-top:3px;color:var(--purple);font-size:7px}.outline-chapter{padding:10px 8px 6px;border-bottom:1px solid #f0f0f4}.outline-chapter>div{padding:0 5px 7px;display:flex;align-items:center;justify-content:space-between}.outline-chapter b{font-size:8px}.outline-chapter>div button{color:var(--purple);background:transparent;font-size:7px}.outline-section{width:100%;padding:8px;display:grid;grid-template-columns:28px minmax(0,1fr) auto;align-items:center;gap:5px;border-radius:8px;color:#6f7588;background:transparent;text-align:left}.outline-section:hover,.outline-section.active{color:var(--purple);background:var(--purple-soft)}.outline-section span,.outline-section em{font-size:6px;font-style:normal}.outline-section strong{overflow:hidden;font-size:7px;white-space:nowrap;text-overflow:ellipsis}.outline-empty{display:block;padding:7px;color:var(--muted);font-size:7px}.course-editor-panel{padding:20px}.course-editor-empty{min-height:570px;display:grid;place-items:center;align-content:center;text-align:center}.course-editor-empty>span{width:58px;height:58px;display:grid;place-items:center;border-radius:17px;color:var(--purple);background:var(--purple-soft);font-size:22px}.course-editor-empty h3{margin:13px 0 5px;font-size:14px}.course-editor-empty p{color:var(--muted);font-size:8px}.course-welcome>h2,.course-section-head h2{margin:7px 0;font-size:22px}.course-welcome>p,.course-section-head p{color:var(--muted);font-size:9px;line-height:1.7}.course-editor-actions{display:flex;gap:8px}.course-editor-actions button,.course-section-head>button{padding:9px 12px;border-radius:8px;color:var(--purple);background:var(--purple-soft);font-size:8px}.course-section-head>button{color:#fff;background:var(--purple)}.course-editor-actions .primary{color:#fff;background:#3d88ed;box-shadow:0 7px 17px rgba(61,136,237,.24)}.course-editor-more{position:relative}.course-editor-more-menu{position:absolute;z-index:20;top:calc(100% + 6px);right:0;min-width:158px;padding:6px;display:none;border:1px solid var(--line);border-radius:10px;background:#fff;box-shadow:0 14px 32px rgba(23,29,61,.16)}.course-editor-more-menu.open{display:block}.course-editor-actions .course-editor-more-menu button{width:100%;padding:9px 11px;display:flex;align-items:center;gap:8px;border-radius:7px;color:#4d566a;background:transparent;font-size:9px;text-align:left}.course-editor-actions .course-editor-more-menu button:hover{color:var(--purple);background:var(--purple-soft)}.course-section-head{display:flex;align-items:start;justify-content:space-between;gap:12px}.course-section-head>div>span{color:var(--purple);font-size:7px;font-weight:750}.content-block-list{margin-top:18px;display:flex;flex-direction:column;gap:8px}.builder-block{padding:11px;display:grid;grid-template-columns:25px 38px minmax(0,1fr) 26px;align-items:center;gap:9px;border:1px solid var(--line);border-radius:11px;background:#fff}.builder-block-index{color:#b3b6c2;font:7px ui-monospace,monospace}.builder-block-icon{width:38px;height:38px;display:grid;place-items:center;border-radius:10px;color:var(--purple);background:var(--purple-soft);font-size:12px;font-weight:800}.builder-block-icon.type-video{color:#ad5261;background:#fff0f2}.builder-block-icon.type-quiz{color:#b47628;background:#fff3df}.builder-block-icon.type-algorithm{color:#158b86;background:#e5f8f5}.builder-block-copy{display:flex;min-width:0;flex-direction:column}.builder-block-copy span{color:var(--purple);font-size:6px}.builder-block-copy strong{margin:3px 0;font-size:9px}.builder-block-copy p{margin:0;overflow:hidden;color:var(--muted);font-size:7px;white-space:nowrap;text-overflow:ellipsis}.builder-block-delete{width:25px;height:25px;border-radius:7px;color:#b65b65;background:#fff0f1}.course-block-empty{padding:35px;border:1px dashed #dcdde5;border-radius:11px;color:var(--muted);text-align:center;font-size:8px}.block-add-bar{margin-top:13px;padding:10px;display:flex;align-items:center;flex-wrap:wrap;gap:6px;border-radius:11px;background:#f5f5f8}.block-add-bar>span{margin-right:3px;color:var(--muted);font-size:7px}.block-add-bar button{padding:7px 8px;display:flex;align-items:center;gap:5px;border-radius:7px;color:#5e6476;background:#fff;font-size:7px}.block-add-bar i{color:var(--purple);font-style:normal;font-weight:800}.course-question-picker{max-height:230px;padding:7px;display:flex;overflow:auto;flex-direction:column;gap:5px;border:1px solid var(--line);border-radius:9px}.course-question-picker label{padding:7px;display:grid;grid-template-columns:auto 1fr;align-items:start;gap:7px;border-radius:7px;background:#fafafd}.course-question-picker input{width:auto;margin-top:2px}.course-question-picker span{font-size:7px;line-height:1.5}.course-question-picker b{margin-right:5px;color:var(--purple)}.algorithm-generate-row{display:flex;gap:7px}.algorithm-generate-row input{flex:1}.algorithm-generate-row button{padding:0 10px;border-radius:8px;color:var(--purple);background:var(--purple-soft);font-size:7px;white-space:nowrap}.rich-editor-input{min-height:180px!important;line-height:1.8}.inline-check{align-items:center!important;flex-direction:row!important}.inline-check input{width:auto}.modal-form>small{color:var(--muted);font-size:7px}@media(max-width:1180px){.course-builder{grid-template-columns:220px minmax(260px,1fr)}.course-editor-panel{grid-column:1/-1;min-height:auto}.course-library-panel,.course-outline-panel{min-height:430px}}@media(max-width:700px){.course-builder{grid-template-columns:1fr}.course-editor-panel{grid-column:auto}.course-library-panel,.course-outline-panel{min-height:auto}.block-add-bar{align-items:stretch;flex-direction:column}.course-section-head{flex-direction:column}}

/* Chaoxing-style chapter authoring canvas */
#addCourseChapter{min-width:64px;height:34px;padding:0 13px;font-size:10px;font-weight:750}.outline-chapter>div button{min-width:56px;height:30px;padding:0 10px;border-radius:8px;background:var(--purple-soft);font-size:9px;font-weight:750}.outline-chapter>div{padding-top:3px}.outline-chapter b{font-size:9px}.outline-section{min-height:39px}.outline-section strong{font-size:8px}.course-editor-panel{padding:0;min-height:700px}.cx-editor-shell{min-height:700px;background:#eef1f6}.cx-editor-top{position:sticky;z-index:5;top:0;border-bottom:1px solid #dfe3eb;background:#fff;box-shadow:0 3px 12px rgba(28,36,62,.04)}.cx-editor-format,.cx-editor-insert{min-height:48px;padding:8px 14px;display:flex;align-items:center;gap:6px}.cx-editor-format{border-bottom:1px solid #edf0f4}.cx-editor-format select{height:32px;padding:0 25px 0 9px;border:1px solid #dfe3eb;border-radius:6px;color:#596176;background:#fff;font-size:8px}.cx-editor-format button{width:31px;height:31px;border-radius:6px;color:#657086;background:#f7f8fa;font-size:12px}.cx-editor-format button:hover,.cx-editor-insert button:hover{color:var(--purple);background:var(--purple-soft)}.cx-editor-insert>span{margin-right:4px;color:#a0a7b7;font-size:8px}.cx-editor-insert button{height:34px;padding:0 11px;display:flex;align-items:center;gap:6px;border-radius:7px;color:#4f596e;background:#f4f6f9;font-size:8px;white-space:nowrap}.cx-editor-insert button i{color:var(--purple);font-style:normal;font-weight:800}.cx-editor-tabs{height:52px;padding:8px 18px 0;display:flex;align-items:flex-start;gap:4px;background:#eef1f6}.cx-editor-tabs button{height:44px;padding:0 18px;border-radius:9px 9px 0 0;color:#687187;background:#f8f9fb;font-size:8px}.cx-editor-tabs button.active{color:var(--purple);background:#fff;font-weight:750}.cx-editor-tabs>span{flex:1}.cx-editor-tabs button:last-child{height:34px;border-radius:8px;color:#fff;background:var(--purple)}.cx-editor-canvas{width:calc(100% - 34px);min-height:570px;margin:0 auto 18px;padding:28px 34px 80px;background:#fff;box-shadow:0 12px 30px rgba(31,40,70,.07)}.cx-editor-canvas .course-section-head{padding-bottom:22px;border-bottom:1px solid #edf0f4}.cx-document-flow{padding-top:22px;display:flex;flex-direction:column;gap:18px}.cx-content-block{border:1px solid #dfe4ec;background:#fff;transition:.18s}.cx-content-block:hover{border-color:#bfc5ef;box-shadow:0 8px 20px rgba(45,52,91,.06)}.cx-content-block>header{min-height:58px;padding:10px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;background:#f8fafc}.cx-content-block>header>div:first-child{display:flex;align-items:center;gap:10px}.cx-content-block>header>div:first-child>span:last-child{display:flex;flex-direction:column;gap:3px}.cx-content-block header small{color:var(--purple);font-size:7px}.cx-content-block header strong{font-size:10px}.cx-block-icon{width:34px;height:34px;display:grid;place-items:center;border-radius:7px;color:var(--purple);background:#ece9ff;font-size:12px;font-weight:800}.cx-block-actions{display:flex;gap:6px}.cx-block-actions button{padding:7px 11px;border-radius:7px;color:var(--purple);background:#ebe8ff;font-size:8px;font-weight:700}.cx-block-actions button.danger{color:#c94c5d;background:#fff0f2}.cx-block-body{padding:18px 20px;color:#3f4759;font-size:9px;line-height:1.85}.cx-content-block>footer{min-height:36px;padding:5px 14px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid #edf0f4;color:#adb3c0;font:7px ui-monospace,monospace}.cx-content-block>footer button{padding:5px 8px;color:#6973dc;background:transparent;font:8px inherit}.cx-rich-text{white-space:pre-wrap;font-size:10px;line-height:1.95}.cx-media-preview{display:grid;place-items:center;background:#171b27}.cx-media-preview video{width:min(100%,760px);max-height:430px}.cx-media-preview.image{background:#f4f6f9}.cx-media-preview img{max-width:100%;max-height:480px;object-fit:contain}.cx-file-row{display:flex;align-items:center;gap:12px}.cx-file-row>span{width:42px;height:42px;display:grid;place-items:center;border-radius:8px;color:#4d76b8;background:#eaf1fb;font-size:17px}.cx-file-row>div{display:flex;flex:1;flex-direction:column}.cx-file-row small{color:var(--muted)}.cx-file-row a{padding:7px 11px;border-radius:7px;color:var(--purple);background:var(--purple-soft);text-decoration:none}.cx-quiz-body p,.cx-algorithm-body p{margin:7px 0 0;color:var(--muted)}.cx-algorithm-body{display:flex;align-items:center;flex-wrap:wrap;gap:10px}.cx-algorithm-body code{padding:5px 8px;border-radius:6px;color:#137c78;background:#e5f8f5}.cx-algorithm-body p{width:100%}.cx-empty-document{padding:70px 20px;text-align:center;color:var(--muted)}.cx-empty-document>span{width:54px;height:54px;margin:auto;display:grid;place-items:center;border-radius:50%;color:var(--purple);background:var(--purple-soft);font-size:22px}.cx-empty-document h3{margin:14px 0 6px;color:var(--ink);font-size:13px}.cx-empty-document p{font-size:8px}.cx-direct-upload{padding:13px;border:1px dashed #cfd4e1;border-radius:10px;background:#fafbfc}.cx-direct-upload>span{color:var(--ink);font-size:9px}.cx-direct-upload small{color:var(--muted);font-size:7px;font-weight:500}.cx-or{display:flex;align-items:center;gap:8px;color:#a5aab7;font-size:7px}.cx-or:before,.cx-or:after{height:1px;flex:1;background:#eceef3;content:""}.cx-current-resource{padding:11px;display:flex;align-items:center;gap:10px;border-radius:9px;background:#f5f7fa}.cx-current-resource>span{width:38px;height:38px;display:grid;place-items:center;border-radius:8px;color:var(--purple);background:#eae7ff}.cx-current-resource>div{display:flex;flex-direction:column}.cx-current-resource small{color:var(--muted);font-size:7px}.cx-current-resource strong{margin-top:3px;font-size:9px}@media(max-width:1050px){.cx-editor-format{display:none}.cx-editor-insert{overflow:auto}.cx-editor-canvas{width:100%;padding:22px 20px}.cx-content-block>header{align-items:flex-start;flex-direction:column}.cx-block-actions{width:100%;justify-content:flex-end}}

/* A section is one canvas; blocks are inline document segments, not separate canvases. */
.cx-document-flow{gap:0}.cx-content-block{position:relative;padding:8px 0 22px;border:0;border-bottom:1px solid #edf0f4;background:transparent;box-shadow:none}.cx-content-block:last-child{border-bottom:0}.cx-content-block:hover{border-color:#dfe2f5;box-shadow:none}.cx-content-block>header{min-height:42px;padding:5px 0;background:transparent}.cx-block-icon{width:28px;height:28px;border-radius:6px;font-size:10px}.cx-content-block header small{font-size:6px}.cx-content-block header strong{font-size:9px}.cx-block-actions{opacity:0;transition:.18s}.cx-content-block:hover .cx-block-actions,.cx-content-block:focus-within .cx-block-actions{opacity:1}.cx-block-actions button{padding:6px 9px;background:#f0eeff;font-size:7px}.cx-block-body{padding:10px 0 4px}.cx-content-block>footer{display:none}.cx-rich-text{padding:4px 8px;font-size:11px;line-height:2}.cx-media-preview{overflow:hidden;border-radius:5px;background:#111827}.cx-media-preview video{display:block;width:100%;max-width:none;max-height:520px;background:#111827}.cx-media-preview.image{background:#f7f8fa}.cx-file-row{padding:14px;border:1px solid #e1e5ec;border-radius:7px;background:#fafbfc}.cx-content-block.type-file,.cx-content-block.type-image,.cx-content-block.type-video{padding-top:14px}@media(max-width:1050px){.cx-block-actions{opacity:1}.cx-content-block>header{align-items:center;flex-direction:row}.cx-block-actions{width:auto}}

/* True section-level WYSIWYG editor */
.wysiwyg-shell{min-height:760px;padding-bottom:24px;background:#edf0f5}.wysiwyg-toolbar{position:sticky;z-index:12;top:0;border-bottom:1px solid #dfe3ea;background:#fff;box-shadow:0 4px 13px rgba(27,34,59,.06)}.wysiwyg-toolbar-row{min-height:48px;padding:7px 13px;display:flex;align-items:center;gap:5px}.wysiwyg-toolbar-row+.wysiwyg-toolbar-row{border-top:1px solid #eef0f4}.wysiwyg-toolbar select{height:33px;padding:0 24px 0 9px;border:1px solid #dce0e8;border-radius:6px;color:#4f586d;background:#fff;font-size:8px}.wysiwyg-toolbar button{height:33px;min-width:33px;padding:0 9px;border-radius:6px;color:#5c667b;background:#f5f6f8;font-size:9px}.wysiwyg-toolbar button:hover{color:var(--purple);background:var(--purple-soft)}.wysiwyg-color-tool{width:33px;height:33px;position:relative;display:grid;place-items:center;border-radius:6px;color:#273044;background:#f5f6f8;font-size:11px;font-weight:800;cursor:pointer}.wysiwyg-color-tool.highlight{color:#bd8b25;background:#fff7dc}.wysiwyg-color-tool input{width:1px;height:1px;position:absolute;left:50%;bottom:3px;opacity:0}.toolbar-divider{width:1px;height:25px;margin:0 3px;background:#e2e5eb}.insert-row>span{margin-right:3px;color:#989fad;font-size:8px}.insert-row button{padding:0 11px}.toolbar-spacer{flex:1}.insert-row small{color:#9298a7;font-size:7px}.insert-row .save-document{padding:0 15px;color:#fff;background:var(--purple);font-weight:750}.wysiwyg-section-bar{height:51px;padding:10px 24px 0;display:flex;align-items:flex-start;gap:8px}.wysiwyg-section-bar strong{height:41px;padding:0 17px;display:flex;align-items:center;border-radius:9px 9px 0 0;color:var(--purple);background:#fff;font-size:9px}.wysiwyg-section-bar button{height:31px;padding:0 10px;border-radius:7px;color:#737c90;background:#f8f9fb;font-size:7px}.wysiwyg-section-bar .back-to-directory,.wysiwyg-section-bar .outline-toggle{height:41px;padding:0 14px;border-radius:8px;color:var(--purple);background:#fff;font-weight:700;font-size:8px}.wysiwyg-section-bar .back-to-directory:hover,.wysiwyg-section-bar .outline-toggle:hover{background:var(--purple-soft)}.wysiwyg-section-bar span{margin-left:auto;padding-top:8px;color:#8f96a6;font-size:7px}.wysiwyg-page{width:calc(100% - 32px);min-height:650px;margin:0 auto;padding:48px 58px 110px;overflow-wrap:anywhere;border:0;outline:0;color:#30394d;background:#fff;box-shadow:0 12px 32px rgba(30,39,68,.08);font-size:16px;line-height:1.85;caret-color:var(--purple)}.wysiwyg-page:empty:before{color:#b2b7c2;content:attr(data-placeholder)}.wysiwyg-page h1{margin:28px 0 13px;font-size:32px;line-height:1.4}.wysiwyg-page h2{margin:25px 0 11px;font-size:25px;line-height:1.45}.wysiwyg-page h3{margin:22px 0 9px;font-size:20px}.wysiwyg-page p{margin:10px 0;min-height:1.7em}.wysiwyg-page blockquote{margin:16px 0;padding:12px 17px;border-left:4px solid var(--purple);background:#f7f5ff}.wysiwyg-page a{color:#426eda;text-decoration:underline}.wysiwyg-page figure{max-width:100%;margin:25px auto;position:relative}.wysiwyg-page img,.wysiwyg-page video{width:100%;max-height:560px;display:block;border-radius:8px;background:#151927;object-fit:contain}.wysiwyg-page .wysiwyg-embed.presentation iframe{width:100%;height:560px;display:block;border:0;border-radius:8px;background:#fff}.wysiwyg-page figcaption{margin-top:7px;color:#9299a8;font-size:12px;text-align:center}.wysiwyg-page .wysiwyg-attachment{margin:17px 0;padding:14px 48px 14px 16px;position:relative;border:1px solid #dfe3eb;border-radius:9px;background:#fafbfc}.wysiwyg-page .wysiwyg-attachment a{text-decoration:none;font-size:14px;font-weight:700}.wysiwyg-remove-embed{width:28px!important;height:28px!important;min-width:0!important;position:absolute;z-index:2;top:8px;right:8px;border-radius:50%!important;color:#fff!important;background:rgba(26,31,46,.7)!important;font-size:16px!important}.wysiwyg-attachment .wysiwyg-remove-embed{color:#bc4353!important;background:#ffe9ec!important}.wysiwyg-formula{display:inline-block;padding:3px 8px;border-radius:6px;background:#f0f1f5;font-family:Georgia,serif;font-style:italic}.wysiwyg-page table{width:100%;margin:18px 0;border-collapse:collapse;table-layout:fixed}.wysiwyg-page td,.wysiwyg-page th{min-width:70px;height:38px;padding:7px;border:1px solid #cfd4de}.wysiwyg-page td:focus{background:#faf9ff}@media(max-width:1050px){.wysiwyg-toolbar{position:static}.wysiwyg-toolbar-row{overflow:auto}.wysiwyg-page{width:100%;padding:32px 25px 80px}.toolbar-divider{display:none}}@media(max-width:650px){.wysiwyg-toolbar-row:first-child select{display:none}.toolbar-spacer,.insert-row small{display:none}.wysiwyg-page{font-size:15px}.wysiwyg-section-bar span{display:none}}

/* Rich editor completion: fonts, history, document actions and three-level outline */
.wysiwyg-toolbar-row:first-child{flex-wrap:wrap}.wysiwyg-toolbar select{min-width:82px;font-size:11px}.wysiwyg-toolbar select[data-editor-font]{min-width:118px}.wysiwyg-toolbar select[data-editor-size]{min-width:76px}.history-action{display:flex;align-items:center;gap:4px}.history-action span{font-size:15px}.editor-document-actions{display:flex;align-items:center;gap:6px}.editor-document-actions button{padding:0 15px;border:1px solid #e1e4ea;background:#fff;font-weight:700}.editor-document-actions .save-document{border-color:var(--purple);color:#fff;background:var(--purple);box-shadow:0 6px 14px rgba(101,86,232,.2)}.editor-document-actions #completeWysiwygDocument{color:#fff;border-color:#26344d;background:#33445f}.wysiwyg-shell.is-preview .wysiwyg-toolbar-row:not(:first-child),.wysiwyg-shell.is-preview .wysiwyg-section-bar button,.wysiwyg-shell.is-complete .wysiwyg-toolbar-row:not(:first-child),.wysiwyg-shell.is-complete .wysiwyg-section-bar button{display:none}.wysiwyg-shell.is-preview .wysiwyg-page,.wysiwyg-shell.is-complete .wysiwyg-page{caret-color:transparent}.wysiwyg-shell.is-preview .wysiwyg-remove-embed,.wysiwyg-shell.is-complete .wysiwyg-remove-embed{display:none}.wysiwyg-shell.is-complete .wysiwyg-page{box-shadow:0 12px 32px rgba(46,117,87,.1)}
.outline-chapter>.outline-chapter-row{padding:4px 5px 7px;display:grid;grid-template-columns:22px minmax(0,1fr) auto;align-items:center;gap:4px}.outline-chapter>.outline-chapter-row>.outline-caret,.outline-unit-row .outline-caret{width:20px;min-width:20px;height:20px;padding:0;border-radius:5px;color:#778097;background:#f2f3f6;font-size:11px;transition:.18s}.outline-chapter-row b,.outline-unit-row b{display:flex;min-width:0;align-items:center;gap:5px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.outline-chapter-row b small,.outline-unit-row b small,.outline-section strong small{padding:2px 4px;border-radius:4px;color:var(--purple);background:#eeebff;font-size:6px;font-weight:800}.outline-chapter>.outline-chapter-children{padding:0 0 3px 15px;display:block}.outline-chapter.collapsed>.outline-chapter-children,.outline-unit.collapsed>.outline-unit-children{display:none}.outline-chapter.collapsed>.outline-chapter-row>.outline-caret,.outline-unit.collapsed>.outline-unit-row .outline-caret{transform:rotate(-90deg)}.outline-unit{border-left:1px solid #e1e4eb}.outline-chapter>div .outline-unit-row{width:100%;height:32px;min-width:0;padding:3px 5px;display:grid;grid-template-columns:22px minmax(0,1fr) auto;align-items:center;gap:4px;border-radius:7px;color:#5f687b;background:transparent;text-align:left}.outline-unit-row b{font-size:8px}.outline-unit-row em{color:#a0a6b4;font-size:7px;font-style:normal}.outline-unit-children{padding-left:13px}.outline-chapter>div .outline-section{min-height:42px;padding:6px;display:grid;grid-template-columns:8px 35px minmax(0,1fr) auto;gap:5px;background:transparent}.outline-chapter>div .outline-section:hover,.outline-chapter>div .outline-section.active{background:var(--purple-soft)}.outline-leaf-dot{width:6px;height:6px;border:1px solid #a9afbd;border-radius:50%}.outline-section.active .outline-leaf-dot{border-color:var(--purple);background:var(--purple)}.outline-section i{color:#a1a7b5;font-size:6px;font-style:normal}.outline-section strong{display:flex;min-width:0;align-items:center;gap:4px}.outline-chapter>div .outline-section em{font-size:6px}

/* TEX formula editor */
.tex-editor-backdrop{position:fixed;z-index:100;inset:0;padding:24px;display:none;align-items:center;justify-content:center;background:rgba(17,23,43,.58);backdrop-filter:blur(4px)}.tex-editor-backdrop.show{display:flex}.tex-editor-dialog{width:min(1080px,calc(100vw - 36px));max-height:calc(100vh - 40px);display:flex;overflow:hidden;flex-direction:column;border-radius:14px;background:#fff;box-shadow:0 25px 80px rgba(12,18,38,.28)}.tex-editor-dialog>header{height:62px;padding:0 22px;display:flex;flex:0 0 auto;align-items:center;justify-content:space-between;border-bottom:1px solid #e6e8ed;background:#354b67}.tex-editor-dialog>header h2{margin:0;color:#fff;font:700 17px Georgia,serif;letter-spacing:.12em}.tex-editor-dialog>header>div{display:flex;align-items:center;gap:8px}.tex-editor-dialog>header button{height:34px;padding:0 11px;border-radius:7px;color:#dfe8f4;background:rgba(255,255,255,.08);font-size:10px}.tex-editor-dialog>header .tex-close{width:34px;padding:0;font-size:21px}.tex-tabs{height:49px;padding:0 22px;display:flex;flex:0 0 auto;align-items:end;gap:25px;border-bottom:1px solid #e5e7ed}.tex-tabs button{height:49px;position:relative;color:#777f90;background:transparent;font-size:11px;font-weight:700}.tex-tabs button.active{color:var(--purple)}.tex-tabs button.active:after{height:3px;position:absolute;right:0;bottom:0;left:0;border-radius:3px 3px 0 0;background:var(--purple);content:""}.tex-tab-panel{min-height:178px;padding:16px 22px;display:none;overflow:auto;background:#f7f8fa}.tex-tab-panel.active{display:block}.tex-tool-grid{display:grid;grid-template-columns:repeat(10,minmax(72px,1fr));gap:7px}.tex-tool-group{min-width:0;position:relative;display:grid;grid-template-columns:minmax(0,1fr) 20px;border:1px solid #e0e3e9;border-radius:8px;background:#fff}.tex-tool-main{height:71px;padding:7px 3px;display:flex;align-items:center;justify-content:center;flex-direction:column;background:transparent}.tex-tool-main strong{font-family:Georgia,"Times New Roman",serif;font-size:15px}.tex-tool-main small{margin-top:7px;color:#9ca2ae;font-size:6px}.tex-tool-arrow{width:20px;color:#9aa1af;background:#f2f3f6;font-size:9px}.tex-tool-menu{position:absolute;z-index:5;top:75px;left:0;min-width:110px;padding:5px;display:none;border:1px solid #dfe2e9;border-radius:8px;background:#fff;box-shadow:0 10px 28px rgba(28,35,59,.14)}.tex-tool-menu.show{display:grid;grid-template-columns:1fr 1fr}.tex-tool-menu button{padding:7px;color:#4e5668;background:transparent;font:11px Georgia,serif}.tex-tool-menu button:hover{background:var(--purple-soft)}.tex-template-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.tex-template-grid button{min-height:105px;padding:15px;display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px solid #e1e3e9;border-radius:9px;background:#fff;font:14px Georgia,serif}.tex-template-grid small{margin-top:9px;color:#989eab;font:7px Inter,sans-serif}.tex-recognition-drop{min-height:105px;display:flex;align-items:center;justify-content:center;flex-direction:column;border:1px dashed #bfc5d2;border-radius:9px;background:#fff;cursor:pointer}.tex-recognition-drop input{display:none}.tex-recognition-drop span{color:var(--purple);font-size:22px}.tex-recognition-drop strong{margin:6px 0;font-size:10px}.tex-recognition-drop small{color:#969daa;font-size:7px}.tex-image-preview{margin-top:10px;display:flex;align-items:center;gap:10px}.tex-image-preview img{max-width:180px;max-height:80px;border-radius:6px}.tex-image-preview p{color:#777f8f;font-size:8px}.tex-format-row{min-height:50px;padding:8px 22px;display:flex;flex:0 0 auto;align-items:center;gap:7px;border-top:1px solid #e8e9ee;border-bottom:1px solid #e8e9ee}.tex-format-row button,.tex-format-row label,.tex-format-row select{height:32px;padding:0 9px;display:flex;align-items:center;gap:5px;border:1px solid #dfe2e8;border-radius:6px;color:#555e70;background:#fff;font-size:9px}.tex-format-row input[type=color]{width:18px;height:18px;padding:0;border:0}.tex-format-row label select{height:25px;padding:0;border:0}.tex-format-row>span{flex:1}.tex-input-area{padding:14px 22px 8px;display:flex;min-height:145px;flex:1;flex-direction:column}.tex-input-area label,.tex-output-area>strong{margin-bottom:7px;color:#737b8b;font-size:8px}.tex-input-area textarea{width:100%;min-height:108px;padding:13px;resize:vertical;border:1px solid #d9dde6;border-radius:8px;outline:0;font:14px/1.7 ui-monospace,SFMono-Regular,Menlo,monospace}.tex-input-area textarea:focus{border-color:var(--purple);box-shadow:0 0 0 3px rgba(101,86,232,.09)}.tex-output-area{min-height:105px;margin:0 22px 12px;padding:10px 14px;border:1px solid #e0e3e9;border-radius:8px;background:#fbfbfd}.tex-output-area #texPreview{min-height:52px;display:grid;place-items:center;overflow:auto}.tex-editor-dialog>footer{min-height:64px;padding:11px 22px;display:flex;flex:0 0 auto;align-items:center;justify-content:flex-end;gap:9px;border-top:1px solid #e5e7ed}.tex-editor-dialog>footer button{height:39px;padding:0 25px;border-radius:8px;font-size:10px;font-weight:750}.tex-cancel{border:1px solid #d9dce4;background:#fff}.tex-confirm{color:#fff;background:linear-gradient(100deg,#7567ef,#5747d2);box-shadow:0 8px 18px rgba(89,72,205,.23)}.wysiwyg-formula{cursor:pointer}.wysiwyg-formula .katex{font-size:1em}.wysiwyg-formula:hover{outline:2px solid rgba(101,86,232,.2);outline-offset:3px}
@media(max-width:1150px){.tex-tool-grid{grid-template-columns:repeat(5,1fr)}.tex-editor-dialog{max-height:calc(100vh - 20px)}.tex-tab-panel{min-height:248px}.editor-document-actions{width:100%;justify-content:flex-end}.wysiwyg-toolbar-row:first-child>.toolbar-spacer{display:none}}@media(max-width:700px){.tex-editor-backdrop{padding:6px}.tex-editor-dialog{width:100%;max-height:calc(100vh - 12px)}.tex-tool-grid{grid-template-columns:repeat(2,1fr)}.tex-template-grid{grid-template-columns:1fr 1fr}.tex-format-row{overflow:auto}.tex-format-row>span{display:none}.tex-output-area{min-height:90px}.wysiwyg-toolbar select[data-editor-font]{display:block;min-width:110px}.wysiwyg-toolbar select[data-editor-size]{display:block;min-width:70px}}
.wysiwyg-shell.is-preview .wysiwyg-toolbar-row:first-child>:not(.editor-document-actions),.wysiwyg-shell.is-complete .wysiwyg-toolbar-row:first-child>:not(.editor-document-actions){display:none}.tex-editor-dialog{overflow-y:auto}
.outline-chapter>div .outline-unit-title{width:100%;min-width:0;height:auto;padding:0;overflow:hidden;color:#5f687b;background:transparent;text-align:left}.outline-chapter>div .outline-unit-title.active{color:var(--purple)}.outline-chapter>div .outline-unit-title b{overflow:hidden;text-overflow:ellipsis}.outline-chapter>div .outline-section{grid-template-columns:8px 35px minmax(0,1fr)}

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

/* Distinct CSS alignment icons and line-height menu */
.alignment-button{padding:0!important;display:grid!important;place-items:center;border:1px solid transparent}.alignment-button.active{border-color:#6682ee!important;color:#3f63dc!important;background:#eaf0ff!important}.align-css-icon{width:18px;height:15px;display:flex;justify-content:space-between;flex-direction:column}.align-css-icon i{height:2px;display:block;border-radius:2px;background:currentColor}.align-left i:nth-child(1){width:100%;margin-right:auto}.align-left i:nth-child(2){width:65%;margin-right:auto}.align-left i:nth-child(3){width:82%;margin-right:auto}.align-center i:nth-child(1){width:100%;margin:auto}.align-center i:nth-child(2){width:65%;margin:auto}.align-center i:nth-child(3){width:82%;margin:auto}.align-right i:nth-child(1){width:100%;margin-left:auto}.align-right i:nth-child(2){width:65%;margin-left:auto}.align-right i:nth-child(3){width:82%;margin-left:auto}.align-justify i{width:100%}.align-justify i:nth-child(2){background:linear-gradient(90deg,currentColor 0 42%,transparent 42% 55%,currentColor 55% 100%)}.line-height-control{position:relative}.line-height-control>button{min-width:70px;display:flex;align-items:center;justify-content:center;gap:5px}.line-height-control>button span{font-size:13px}.line-height-control>button b{font-size:9px}.line-height-control>button i{color:#9299a8;font-size:7px;font-style:normal}.line-height-menu{width:86px;padding:5px;position:absolute;z-index:30;top:38px;left:0;display:none;border:1px solid #dfe3eb;border-radius:8px;background:#fff;box-shadow:0 12px 28px rgba(28,36,61,.16)}.line-height-control.open .line-height-menu{display:grid;grid-template-columns:1fr 1fr;gap:3px}.wysiwyg-toolbar .line-height-menu button{height:29px;min-width:0;padding:0;border-radius:5px;background:#f7f8fa;font-size:8px}.wysiwyg-toolbar .line-height-menu button:hover{color:#3f63dc;background:#eaf0ff}

/* Inline section title editing */
.wysiwyg-section-bar .inline-section-title{max-width:min(680px,75%);gap:7px;cursor:text}.inline-section-title>span{margin-left:0;padding-top:0;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.wysiwyg-section-bar .inline-title-pencil{width:27px;min-width:27px;height:27px;padding:0;display:grid;place-items:center;color:#7062dc;background:#efedff;font-size:12px;opacity:.68;transition:.16s}.inline-section-title:hover .inline-title-pencil,.inline-title-pencil:focus{opacity:1;transform:translateY(-1px)}.wysiwyg-section-bar .inline-section-title.editing{min-width:min(560px,75%);padding:5px 8px}.inline-section-title input{width:100%;height:31px;padding:0 10px;border:1px solid #7768ed;border-radius:7px;outline:0;color:#2c3448;background:#fff;font-size:12px;font-weight:700;box-shadow:0 0 0 3px rgba(101,86,232,.1)}.inline-section-title.saving{opacity:.62}

/* Manual chapter → section outline only; editor headings never become tree nodes. */
.outline-chapter>div .outline-unit-row{min-height:40px;grid-template-columns:14px minmax(0,1fr);cursor:pointer}.outline-chapter>div .outline-unit-row:hover,.outline-chapter>div .outline-unit-row.active{color:var(--purple);background:var(--purple-soft)}.outline-unit-row.active .outline-leaf-dot{border-color:var(--purple);background:var(--purple)}

/* Chaoxing-style manual outline: chapter / section / optional subsection. */
.outline-create-actions{display:flex;gap:7px}.course-builder-head .outline-create-actions button{height:34px;padding:0 11px;display:flex;align-items:center;gap:4px;border:1px solid #dedafc;border-radius:8px;font-size:10px;font-weight:750}.outline-create-actions button i{font-size:15px;font-style:normal;line-height:1}.outline-chapter{padding:4px 0;border-bottom:1px solid #f0f1f5}.outline-tree-item{min-height:42px;padding-right:7px;display:grid;grid-template-columns:24px minmax(0,1fr) 30px;align-items:center;border-left:3px solid transparent;transition:.16s}.outline-tree-item.level-1{padding-left:20px}.outline-tree-item.level-2{padding-left:40px}.outline-tree-item:hover{background:#f7f8fc}.outline-tree-item.active{border-left-color:var(--purple);background:#eeebff}.outline-tree-item .outline-caret{width:22px;min-width:22px;height:22px;padding:0;border-radius:5px;color:#778097;background:#f1f3f7;font-size:12px;transition:.16s}.outline-caret-spacer{width:22px}.outline-node-title{width:100%;min-width:0;height:38px;padding:0 5px;overflow:hidden;color:#4d566a;background:transparent;text-align:left}.outline-node-title b{display:block;overflow:hidden;font-size:10px;white-space:nowrap;text-overflow:ellipsis}.outline-tree-item.level-0 .outline-node-title b{color:#283248;font-weight:800}.outline-tree-item.active .outline-node-title b{color:var(--purple)}.outline-delete{width:28px;height:28px;padding:0;border-radius:7px;background:#fff0f2;font-size:12px;opacity:0;transform:translateX(3px);transition:.16s}.outline-tree-item:hover .outline-delete,.outline-delete:focus-visible{opacity:1;transform:none}.outline-node-title input{width:100%;height:31px;padding:0 8px;border:1px solid var(--purple);border-radius:6px;outline:0;background:#fff;font-size:10px;font-weight:700;box-shadow:0 0 0 3px rgba(101,86,232,.1)}.outline-chapter>.outline-chapter-children{padding:0;display:block}.outline-section-children{display:block}.outline-chapter.collapsed>.outline-chapter-children,.outline-section-group.collapsed>.outline-section-children{display:none}.outline-chapter.collapsed>.outline-tree-item .outline-caret,.outline-section-group.collapsed>.outline-tree-item .outline-caret{transform:rotate(-90deg)}.outline-empty{padding:10px 18px 12px 47px}.wysiwyg-toolbar button:disabled{cursor:not-allowed;opacity:.38}

/* Immersive course construction and clean Chaoxing-like outline. */
body.course-build-focus{background:#fff}body.course-build-focus .teacher-sidebar{display:none}body.course-build-focus .teacher-main{margin-left:0}body.course-build-focus .teacher-topbar{height:56px;padding:0 20px;border-bottom:1px solid #e8e8e8;background:#fff;backdrop-filter:none}body.course-build-focus .mobile-menu{width:auto;height:34px;padding:0 12px;display:flex;align-items:center;border:1px solid #e2e2e2;border-radius:0;color:#555;background:#fff;font-size:13px}body.course-build-focus .teacher-topbar>div:first-of-type{position:absolute;left:50%;transform:translateX(-50%);text-align:center}body.course-build-focus .teacher-topbar>div:first-of-type>span{display:none}body.course-build-focus .teacher-topbar h1{margin:0;color:#333;font-size:15px;font-weight:500}body.course-build-focus .topbar-actions{margin-left:auto}body.course-build-focus .notification,body.course-build-focus .teacher-profile{display:none}body.course-build-focus .teacher-content{width:100%;padding:0}body.course-build-focus #teacher-course-build>.course-workspace-heading{display:none}body.course-build-focus .course-builder.course-builder-workspace{min-height:calc(100vh - 56px);margin:0;grid-template-columns:330px minmax(0,1fr);gap:0;align-items:stretch}body.course-build-focus .course-outline-panel,body.course-build-focus .course-editor-panel{min-height:calc(100vh - 56px);border:0;border-radius:0;box-shadow:none}body.course-build-focus .course-outline-panel{position:relative;z-index:2;border-right:1px solid #e8e8e8;background:#fff}body.course-build-focus .course-editor-panel{background:#edf0f5}
.course-outline-panel,.course-outline{background:#fff}.course-outline-panel{border-radius:0;box-shadow:none}.course-builder-head{height:56px;padding:0 12px;border-bottom:1px solid #ededed;background:#fff}.course-builder-head strong{color:#222;font-size:15px}.outline-create-actions{gap:6px}.course-builder-head .outline-create-actions button{height:32px;padding:0 9px;border:1px solid #dcdde3;border-radius:0;color:#6656e8;background:#fff;font-size:12px;font-weight:500}.course-builder-head .outline-create-actions button i{font-size:16px}.course-builder-head .outline-create-actions button:hover{border-color:#bdb5f2;background:#f8f6ff}.course-builder-head .outline-create-actions button:disabled{color:#aaa;background:#fff;opacity:.55}.outline-course-title{padding:13px 12px;border-bottom:1px solid #f0f0f0;background:#fff}.outline-course-title strong{color:#333;font-size:14px;font-weight:600}.outline-course-title small{margin-top:4px;color:#999;font-size:11px}.outline-chapter{margin:16px 0 0;padding:0;border:0}.outline-chapter:first-of-type{margin-top:8px}.outline-tree-item{min-height:0;padding:8px 12px;grid-template-columns:18px minmax(0,1fr) 28px;gap:8px;border:0;border-bottom:1px solid transparent;background:#fff}.outline-tree-item.level-1{padding-left:36px}.outline-tree-item.level-2{padding-left:60px}.outline-tree-item:hover{border-bottom-color:#f2f2f2;background:#fff}.outline-tree-item.active{border-left:0;background:#fff}.outline-tree-item .outline-caret{width:18px;min-width:18px;height:20px;padding:0;border-radius:0;color:#a8afb9;background:transparent;font-size:9px}.outline-tree-item .outline-caret:hover{color:#606873;background:transparent}.outline-tree-item .outline-caret span{display:block;transition:transform .16s}.outline-caret-spacer{width:18px}.outline-node-title{height:auto;min-height:24px;padding:0;color:#333;background:transparent}.outline-node-title:hover{color:#1a1a1a;background:transparent}.outline-node-title b{display:flex;align-items:baseline;gap:10px;color:#333;font-size:14px;font-weight:400;line-height:24px}.outline-tree-item.level-0 .outline-node-title b{color:#1a1a1a;font-size:16px;font-weight:700}.outline-tree-item.level-2 .outline-node-title b{color:#666}.outline-tree-item.active .outline-node-title b{color:#1a1a1a;font-weight:700}.outline-title-number{flex:0 0 auto;color:#999;font-weight:400}.outline-tree-item.level-0 .outline-title-number{color:#777;font-weight:700}.outline-title-text{min-width:0;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.outline-delete{border-radius:0;color:#999;background:#fff;opacity:0}.outline-delete:hover{color:#c94c5d;background:#fff}.outline-node-title input{height:30px;padding:0 6px;border:0;border-bottom:1px solid #6656e8;border-radius:0;box-shadow:none;font-size:14px}.outline-chapter.collapsed>.outline-tree-item .outline-caret,.outline-section-group.collapsed>.outline-tree-item .outline-caret{transform:none}.outline-chapter.collapsed>.outline-tree-item .outline-caret span,.outline-section-group.collapsed>.outline-tree-item .outline-caret span{transform:rotate(-90deg)}.outline-empty{padding:8px 12px 8px 60px;color:#aaa;font-size:12px}.outline-chapter>.outline-chapter-children{padding:0}
@media(max-width:900px){body.course-build-focus .course-builder.course-builder-workspace{grid-template-columns:280px minmax(0,1fr)}body.course-build-focus .course-editor-panel{grid-column:auto}body.course-build-focus .teacher-topbar>div:first-of-type{position:static;margin-left:12px;transform:none;text-align:left}}@media(max-width:700px){body.course-build-focus .course-builder.course-builder-workspace{grid-template-columns:1fr}body.course-build-focus .course-outline-panel{min-height:auto;border-right:0;border-bottom:1px solid #e8e8e8}body.course-build-focus .course-editor-panel{min-height:650px}.outline-create-actions{display:flex}}

/* Final outline-state reset: overrides legacy chapter button backgrounds. */
#courseOutline,#courseOutline .outline-chapter,#courseOutline .outline-chapter-children,#courseOutline .outline-section-group,#courseOutline .outline-section-children{background:#fff!important;background-color:#fff!important}
#courseOutline .outline-tree-item,#courseOutline .outline-tree-item:not(.active),#courseOutline .outline-tree-item.active,#courseOutline .outline-tree-item:hover,#courseOutline .outline-tree-item:focus-within{border-radius:0!important;background:#fff!important;background-color:#fff!important;box-shadow:none!important}
#courseOutline .outline-chapter>div .outline-node-title,#courseOutline .outline-chapter>div .outline-node-title:not(.active),#courseOutline .outline-chapter>div .outline-node-title.active,#courseOutline .outline-chapter>div .outline-node-title:hover,#courseOutline .outline-chapter>div .outline-node-title:focus{border-radius:0!important;color:#333!important;background:transparent!important;background-color:transparent!important;box-shadow:none!important}
#courseOutline .outline-chapter>div .outline-caret,#courseOutline .outline-chapter>div .outline-caret:hover{border-radius:0!important;color:#a8afb9!important;background:transparent!important;background-color:transparent!important;box-shadow:none!important}
#courseOutline .outline-chapter>div .outline-delete,#courseOutline .outline-chapter>div .outline-delete:hover{border-radius:0!important;background:#fff!important;background-color:#fff!important;box-shadow:none!important}
#courseOutline .outline-tree-item .outline-node-title b{color:#333!important;font-weight:400}#courseOutline .outline-tree-item.level-0 .outline-node-title b{color:#1a1a1a!important;font-weight:700}#courseOutline .outline-tree-item.level-2 .outline-node-title b{color:#666!important;font-weight:400}#courseOutline .outline-tree-item.active .outline-node-title b{color:#1a1a1a!important;font-weight:700}#courseOutline .outline-tree-item:hover .outline-node-title b{color:#1a1a1a!important}

/* Course entry shows the complete directory before opening a chapter editor. */
.course-builder.course-builder-workspace.directory-mode{grid-template-columns:minmax(0,1fr)}.course-builder.directory-mode .course-outline-panel{display:none}.course-builder.directory-mode .course-editor-panel{grid-column:1;min-height:520px;padding:0;overflow:hidden}.course-directory-overview{padding:26px}.course-directory-overview>header{display:flex;align-items:flex-end;justify-content:flex-end;gap:20px;padding-bottom:20px;border-bottom:1px solid var(--line)}.course-directory-overview .course-editor-actions{display:flex;flex:0 0 auto;gap:8px}.course-directory-list{display:grid;gap:12px}.course-directory-chapter{overflow:hidden;border-radius:12px;background:#f7f8fa}.course-directory-chapter-title,.course-directory-item{width:100%;display:grid;grid-template-columns:82px minmax(0,1fr) auto;align-items:center;gap:15px;text-align:left}.course-directory-chapter-title{padding:14px 18px;color:#252b3d;background:transparent;border-left:4px solid #3d88ed}.course-directory-chapter-title:hover{background:#eef0f5}.course-directory-chapter-title>span{color:#3d88ed;font-size:9px;font-weight:800;letter-spacing:.08em}.course-directory-chapter-title>strong{font-size:14px;font-weight:700}.course-directory-item-meta{display:flex;align-items:center;gap:10px}.course-directory-item-meta small{color:var(--muted);font-size:9px}.course-directory-sections{padding:8px 18px 14px}.course-directory-sections>p{margin:10px 0;color:var(--muted);font-size:9px}.course-directory-item{padding:10px 8px 10px 24px;color:#666;background:transparent}.course-directory-item:hover{background:#fff;border-radius:8px}.course-directory-item.level-2{padding-left:48px}.course-directory-item>span{color:#949bb0;font-size:9px}.course-directory-item>strong{font-size:12px;font-weight:400;color:#666}.course-directory-edit{opacity:0;color:var(--purple);font-style:normal;font-size:13px;transition:opacity .15s}.course-directory-chapter-title:hover .course-directory-edit,.course-directory-item:hover .course-directory-edit{opacity:1}.course-directory-empty{padding:54px 20px;text-align:center;color:var(--muted)}.course-directory-empty>span{font-size:30px}.course-directory-empty h3{margin:10px 0 5px;color:#343a4d}.course-directory-empty p{margin:0;font-size:9px}@media(max-width:700px){.course-directory-overview{padding:18px}.course-directory-overview>header{align-items:flex-start;flex-direction:column}.course-directory-chapter-title,.course-directory-item{grid-template-columns:62px minmax(0,1fr)}.course-directory-item-meta{display:none}}
.import-ppt-hint{margin:0;color:var(--muted);font-size:9px;line-height:1.7}.import-ppt-drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:26px;border:1px dashed #c9cde0;border-radius:12px;background:#fafbfd;cursor:pointer}.import-ppt-drop:hover{border-color:var(--purple);background:var(--purple-soft)}.import-ppt-drop input{position:absolute;width:1px;height:1px;opacity:0;overflow:hidden}.import-ppt-drop span{color:var(--ink);font-size:11px;font-weight:700}.import-ppt-drop small{color:var(--muted);font-size:8px}.import-ppt-list{max-height:180px;overflow:auto;display:flex;flex-direction:column;gap:6px}.import-ppt-item{padding:8px 10px;display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:8px;background:#fff}.import-ppt-item>span{width:20px;height:20px;display:grid;place-items:center;border-radius:6px;color:var(--purple);background:var(--purple-soft);font-size:8px}.import-ppt-item strong{flex:1;overflow:hidden;font-size:9px;white-space:nowrap;text-overflow:ellipsis}.import-ppt-item small{color:var(--muted);font-size:8px}