:root{--red:#c3182b;--deep-red:#8f1020;--ink:#1f1f1f;--muted:#666;--soft:#8a8a8a;--line:#e8e8e8;--bg:#f5f5f4;--white:#fff;--gold:#d6a84f;--green:#168a46;--blue:#2563eb;--sidebar:228px}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);letter-spacing:0}button,input,select,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar);display:flex;flex-direction:column;padding:24px 16px;background:#202020;color:#fff}.brand{display:flex;align-items:center;gap:12px;padding:0 8px 26px;border-bottom:1px solid #383838}.brand img{width:62px;height:48px;object-fit:contain;background:#fff;border-radius:4px}.brand strong,.brand span{display:block}.brand strong{font-size:16px}.brand span{margin-top:3px;color:#aaa;font-size:12px}.sidebar nav{display:grid;gap:5px;margin-top:22px}.nav-item{width:100%;height:44px;display:flex;align-items:center;gap:12px;padding:0 12px;border:0;border-radius:6px;color:#bbb;background:transparent;text-align:left}.nav-item svg{width:18px}.nav-item span{flex:1}.nav-item em{font-style:normal;font-size:11px;color:#777}.nav-item:hover,.nav-item.active{color:#fff;background:#343434}.nav-item.active{box-shadow:inset 3px 0 var(--red)}.sidebar-foot{display:flex;align-items:center;gap:9px;margin-top:auto;padding:16px 9px 4px;color:#aaa;font-size:12px}.status-dot{width:8px;height:8px;border-radius:50%;background:#d6a84f}.status-dot.online{background:#22c55e}.main{min-height:100vh;margin-left:var(--sidebar)}.topbar{height:88px;display:flex;align-items:center;justify-content:space-between;padding:0 34px;border-bottom:1px solid var(--line);background:#fff}.topbar h1{margin:0;font-size:22px}.topbar p{margin:6px 0 0;color:var(--soft);font-size:13px}.top-actions,.editor-actions{display:flex;align-items:center;gap:10px}.env-badge{padding:6px 10px;border-radius:4px;color:#866016;background:#fff7dc;font-size:12px}.btn,.icon-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;height:38px;padding:0 16px;border:1px solid #d9d9d9;border-radius:6px;color:#333;background:#fff;font-weight:600}.btn svg,.icon-btn svg{width:16px}.btn:hover,.icon-btn:hover{border-color:#bbb;background:#fafafa}.btn.primary{border-color:var(--red);color:#fff;background:var(--red)}.btn.primary:hover{background:var(--deep-red)}.icon-btn{width:38px;padding:0}.content-view{padding:26px 34px 50px}.hidden{display:none!important}.summary-row{display:grid;grid-template-columns:180px 180px minmax(260px,1fr);gap:1px;border:1px solid var(--line);border-radius:7px;background:var(--line);overflow:hidden}.summary-item{min-height:88px;display:flex;flex-direction:column;justify-content:center;padding:16px 22px;background:#fff}.summary-item span{color:var(--muted);font-size:13px}.summary-item strong{margin-top:8px;font-size:27px}.summary-item .summary-text{font-size:18px}.toolbar{display:flex;gap:10px;margin-top:20px}.search{width:320px;height:38px;display:flex;align-items:center;gap:8px;padding:0 12px;border:1px solid #d9d9d9;border-radius:6px;background:#fff}.search svg{width:16px;color:#888}.search input{width:100%;border:0;outline:0}select,input,textarea{border:1px solid #d9d9d9;border-radius:6px;color:var(--ink);background:#fff;outline:0}select:focus,input:focus,textarea:focus{border-color:var(--red);box-shadow:0 0 0 3px rgba(195,24,43,.08)}.toolbar select{height:38px;padding:0 34px 0 12px}.table-wrap{position:relative;margin-top:14px;border:1px solid var(--line);border-radius:7px;background:#fff;overflow:hidden}table{width:100%;border-collapse:collapse}th,td{height:58px;padding:0 18px;border-bottom:1px solid #eee;text-align:left;font-size:13px}th{height:44px;color:#777;background:#fafafa;font-weight:600}.align-right{text-align:right}.course-cell strong,.course-cell span{display:block}.course-cell span{margin-top:4px;color:#999;font-size:12px}.status-chip{display:inline-flex;align-items:center;padding:5px 8px;border-radius:4px;font-size:12px}.status-chip.published{color:#13723d;background:#e9f7ef}.status-chip.draft{color:#956515;background:#fff5d6}.row-actions{display:flex;justify-content:flex-end;gap:8px}.row-btn{padding:6px 9px;border:0;border-radius:4px;color:var(--red);background:#fff0f2}.row-btn.secondary{color:#555;background:#f2f2f2}.empty-state{min-height:260px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#999}.empty-state svg{width:34px;height:34px;margin-bottom:12px}.empty-state strong{color:#555}.empty-state span{margin-top:7px;font-size:13px}.editor-head{display:flex;align-items:center;gap:14px;margin-bottom:18px}.editor-head>div:nth-child(2){flex:1}.editor-head h2{margin:0;font-size:20px}.editor-head p{margin:5px 0 0;color:#888;font-size:13px}.editor-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:18px;align-items:start}.editor-main{display:grid;gap:16px}.form-section,.side-section{padding:24px;border:1px solid var(--line);border-radius:7px;background:#fff}.section-title{display:flex;align-items:center;gap:12px;margin-bottom:22px}.section-title>span{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;color:var(--red);background:#fff0f2;font-size:12px;font-weight:800}.section-title h3,.side-section h3{margin:0;font-size:16px}.section-title p,.side-section p{margin:5px 0 0;color:#929292;font-size:12px}.field{position:relative;margin-top:17px}.field:first-of-type{margin-top:0}.field label{display:block;margin-bottom:8px;font-size:13px;font-weight:600}.field label b,.side-section h3 b{color:var(--red)}.field input,.field select,.field textarea{width:100%;min-height:40px;padding:9px 11px}.field textarea{min-height:86px;resize:vertical;line-height:1.55}.field small{position:absolute;right:10px;bottom:8px;color:#aaa}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px}.upload-box{min-height:96px;display:flex;align-items:center;gap:15px;padding:17px;border:1px dashed #d9b9be;border-radius:7px;background:#fffafb;cursor:pointer}.upload-box.compact{min-height:76px;margin-top:12px;background:#fff}.upload-box>svg{width:28px;color:var(--red)}.upload-box div{min-width:0;flex:1}.upload-box strong,.upload-box span{display:block}.upload-box span{margin-top:6px;color:#929292;font-size:12px}.upload-box em{padding:7px 10px;border-radius:4px;color:var(--red);background:#fff0f2;font-style:normal;font-size:12px}.upload-box input{display:none}.file-list{display:grid;gap:7px;margin-top:10px}.file-item{display:flex;align-items:center;gap:9px;padding:9px 11px;border:1px solid #eee;border-radius:5px;font-size:12px}.file-item span{min-width:0;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-item button{border:0;color:#888;background:transparent}.editor-side{position:sticky;top:18px;display:grid;gap:14px}.side-section h3{font-size:14px}.check-grid,.check-list{display:grid;gap:7px;margin-top:15px}.check-grid{grid-template-columns:1fr 1fr}.check-option{position:relative}.check-option input{position:absolute;opacity:0}.check-option span{min-height:36px;display:flex;align-items:center;justify-content:center;padding:6px 8px;border:1px solid #ddd;border-radius:5px;color:#666;font-size:12px;cursor:pointer;text-align:center}.check-option input:checked+span{border-color:var(--red);color:var(--red);background:#fff2f3}.check-list .check-option span{justify-content:flex-start;padding-left:12px}.publish-note{display:flex;gap:12px;border-color:#eadbb6;background:#fffdf5}.publish-note>svg{width:21px;flex-shrink:0;color:#a6781f}.publish-note p{line-height:1.55}.modal{position:fixed;z-index:50;inset:0;display:flex;align-items:center;justify-content:center}.modal-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.45)}.modal-panel{position:relative;width:min(680px,calc(100vw - 40px));max-height:84vh;padding:26px;border-radius:7px;background:#fff;overflow:auto}.modal-head{display:flex;justify-content:space-between}.modal-head h2{margin:7px 0 0}.eyebrow{color:var(--red);font-size:11px;font-weight:700}.preview-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}.preview-tag{padding:5px 8px;border-radius:4px;color:#555;background:#f3f3f3;font-size:12px}.preview-block{margin-top:22px;padding-top:18px;border-top:1px solid #eee}.preview-block h3{margin:0 0 10px;font-size:14px}.preview-block p,.preview-block li{color:#555;font-size:13px;line-height:1.65}.toast{position:fixed;z-index:80;left:50%;bottom:28px;transform:translate(-50%,20px);padding:11px 16px;border-radius:6px;color:#fff;background:#222;opacity:0;pointer-events:none;transition:.2s}.toast.show{transform:translate(-50%,0);opacity:1}.toast.error{background:var(--deep-red)}@media(max-width:980px){:root{--sidebar:74px}.brand div,.nav-item span,.nav-item em,.sidebar-foot span:last-child{display:none}.brand{justify-content:center;padding-left:0;padding-right:0}.nav-item{justify-content:center}.topbar,.content-view{padding-left:22px;padding-right:22px}.editor-grid{grid-template-columns:1fr}.editor-side{position:static;grid-template-columns:1fr 1fr}.summary-row{grid-template-columns:1fr 1fr 1fr}}@media(max-width:720px){.sidebar{display:none}.main{margin-left:0}.topbar{height:auto;align-items:flex-start;padding-top:18px;padding-bottom:18px}.top-actions .env-badge{display:none}.content-view{padding:18px 14px 40px}.summary-row{grid-template-columns:1fr}.toolbar{flex-wrap:wrap}.search{width:100%}.editor-actions{width:100%;margin-top:12px}.editor-head{flex-wrap:wrap}.editor-head>div:nth-child(2){min-width:calc(100% - 56px)}.editor-actions .btn{flex:1}.editor-grid,.editor-side,.two-col{grid-template-columns:1fr}.check-grid{grid-template-columns:1fr 1fr}.table-wrap{overflow:auto}table{min-width:650px}}
.quiz-actions{display:flex;align-items:center;gap:10px;margin-top:14px;flex-wrap:wrap}.quiz-actions span{margin-left:auto;color:#777;font-size:13px}.quiz-list{display:grid;gap:10px;margin-top:14px}.quiz-item{padding:12px 14px;border:1px solid #eee;border-radius:6px;background:#fff}.quiz-item-head{display:flex;align-items:center;gap:8px}.quiz-item-head span{width:22px;height:22px;display:flex;align-items:center;justify-content:center;border-radius:50%;color:var(--red);background:#fff0f2;font-size:11px;font-weight:800}.quiz-item-head strong{color:var(--red);font-size:12px}.quiz-item-head button{margin-left:auto;border:0;color:#888;background:transparent;font-size:12px}.quiz-item p{margin:9px 0 7px;color:#222;font-size:13px;line-height:1.55}.quiz-item small{color:#888}.empty-inline{padding:14px;border:1px dashed #ddd;border-radius:6px;color:#888;background:#fafafa;font-size:13px;line-height:1.6}
.upload-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:stretch}.upload-row .upload-box{margin-top:12px}.quiz-help-btn{height:auto;margin-top:12px;padding:0 13px;white-space:nowrap}.quiz-help-panel{width:min(780px,calc(100vw - 40px))}.quiz-help-note{display:flex;gap:10px;margin-top:18px;padding:13px 15px;border-radius:6px;color:#694d15;background:#fff8e5}.quiz-help-note svg{width:18px;flex:0 0 auto}.quiz-help-note p{margin:0;font-size:13px;line-height:1.65}.quiz-help-section{margin-top:20px;padding-top:18px;border-top:1px solid #eee}.quiz-help-section h3{margin:0;font-size:15px}.quiz-help-section p{margin:6px 0 0;color:#777;font-size:12px}.quiz-help-section pre{margin:14px 0 0;padding:16px;border:1px solid #e5e5e5;border-radius:6px;background:#fafafa;overflow:auto;font:12px/1.65 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap}.template-actions{display:flex;gap:9px;margin-top:12px;flex-wrap:wrap}.template-table-wrap{margin-top:14px;border:1px solid #eee;border-radius:6px;overflow:auto}.template-table{min-width:700px}.template-table th,.template-table td{height:auto;padding:10px 12px;font-size:12px;white-space:nowrap}@media(max-width:720px){.upload-row{grid-template-columns:1fr}.quiz-help-btn{height:38px;margin-top:0}.quiz-help-panel{width:calc(100vw - 24px);padding:20px}}

.chapter-workspace{display:grid;grid-template-columns:240px minmax(0,1fr);gap:14px;margin-bottom:14px}.chapter-list-panel,.chapter-editor-panel{border:1px solid #ececec;border-radius:7px;background:#fafafa}.chapter-list-panel{padding:12px}.chapter-list-head,.chapter-editor-toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px}.chapter-list-head strong{font-size:13px}.chapter-list-head .row-btn{display:inline-flex;align-items:center;gap:4px}.chapter-list-head svg,.chapter-editor-toolbar svg{width:14px;height:14px}.chapter-editor-list{display:grid;gap:7px;margin-top:10px;max-height:280px;overflow:auto}.chapter-editor-item{width:100%;display:flex;align-items:center;gap:9px;padding:10px;border:1px solid #e5e5e5;border-radius:6px;color:#555;background:#fff;text-align:left}.chapter-editor-item:hover{border-color:#d6a6ad}.chapter-editor-item.active{border-color:var(--red);color:var(--red);background:#fff2f3}.chapter-editor-item em{width:24px;height:24px;display:flex;align-items:center;justify-content:center;border-radius:50%;color:inherit;background:#f4f4f4;font-style:normal;font-size:11px;font-weight:700}.chapter-editor-item span{min-width:0;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}.chapter-editor-item small{color:#999;font-size:10px}.chapter-editor-panel{padding:14px;background:#fff}.chapter-editor-toolbar>span{color:var(--red);font-size:12px;font-weight:700}.chapter-editor-toolbar>div{display:flex;gap:6px}.chapter-editor-toolbar .row-btn{display:inline-flex;align-items:center;gap:4px}.chapter-editor-toolbar .row-btn:disabled{cursor:not-allowed;opacity:.4}.video-provider-hint{margin:9px 0 0;padding:9px 11px;border-radius:5px;color:#6b6b6b;background:#f5f5f5;font-size:12px;line-height:1.5}.video-provider-hint.vod{color:#1259a7;background:#eef6ff}.video-provider-hint.processing{color:#8a6115;background:#fff7dc}@media(max-width:760px){.chapter-workspace{grid-template-columns:1fr}.chapter-editor-list{max-height:210px}.chapter-editor-toolbar{align-items:flex-start;flex-direction:column}.chapter-editor-toolbar>div{flex-wrap:wrap}}
.recommendation-layout{grid-template-columns:minmax(300px,380px) minmax(0,1fr)}.recommendation-table{align-self:start;margin-top:0}.recommendation-table table{min-width:900px}.recommendation-table td{height:auto;padding-top:14px;padding-bottom:14px;vertical-align:top}.recommendation-layout .field>small{position:static;display:block;margin-top:6px}.recommendation-layout .row-actions{margin-top:20px;justify-content:flex-start}@media(max-width:980px){.recommendation-layout{grid-template-columns:1fr}}
.chapter-remove-video{display:inline-flex;align-items:center;gap:5px;margin-top:10px}
.course-cover-section{overflow:hidden}.course-cover-preview{position:relative;aspect-ratio:16/9;margin-top:15px;overflow:hidden;border-radius:8px;background:#24191b}.course-cover-base{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.course-cover-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(17,11,13,.12) 0,rgba(17,11,13,.2) 34%,rgba(17,11,13,.82) 62%,rgba(17,11,13,.95) 100%)}.course-cover-instructor{position:absolute;z-index:2;left:0;bottom:0;width:44%;height:100%;object-fit:cover;object-position:left bottom}.course-cover-copy{position:absolute;z-index:3;left:45%;right:7%;top:23%;display:flex;flex-direction:column;color:#fff}.course-cover-copy small{color:#f1b5bd;font-size:8px;font-weight:800;letter-spacing:1.2px}.course-cover-copy strong{margin-top:10px;font-size:17px;line-height:1.18}.course-cover-copy span{margin-top:10px;color:rgba(255,255,255,.72);font-size:9px}.course-cover-preview.manual .course-cover-shade,.course-cover-preview.manual .course-cover-instructor,.course-cover-preview.manual .course-cover-copy{display:none}.course-cover-status{margin-top:10px;padding:9px 10px;border-radius:5px;color:#765f62;background:#f8f1f2;font-size:11px;line-height:1.5}.course-cover-status.matched{color:#17643a;background:#edf8f1}.course-cover-status.warning{color:#8b5b10;background:#fff6dc}.course-cover-status.manual{color:#165d77;background:#edf8fc}.manual-cover-upload{margin-top:12px}.manual-cover-reset{display:inline-flex;align-items:center;gap:5px;margin-top:9px}

.site-compliance{position:fixed;z-index:18;left:var(--sidebar);right:0;bottom:8px;color:#858585;text-align:center;font-size:12px;line-height:1.6;pointer-events:none}.site-compliance a{color:inherit;text-decoration:none;pointer-events:auto}.site-compliance a:hover,.site-compliance a:focus-visible{color:var(--red);text-decoration:underline;text-underline-offset:3px}.auth-shell:not(.hidden)~.site-compliance{left:0}@media(max-width:720px){.site-compliance{left:0;bottom:5px;font-size:11px}}