:root{--ink:#182335;--muted:#748092;--line:#e5eaf0;--paper:#f5f7fa;--blue:#355bec;--blue-soft:#eef2ff;--radius:16px;color-scheme:light;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #8ca3ff;outline-offset:3px}button{border:0}svg{display:block}button,a{touch-action:manipulation}h1,h2,h3,p{margin-top:0}h1{font-size:38px;letter-spacing:-1px;line-height:1.3}h2{font-size:22px;letter-spacing:-.4px}h3{font-size:17px}p{line-height:1.8}.muted{color:var(--muted)}.small{font-size:13px}.site-header{height:86px;background:#fff;display:flex;align-items:center;gap:36px;padding:0 max(28px,calc((100vw - 1400px)/2));border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;gap:10px;font-size:24px;font-weight:750;flex-shrink:0}.brand small{display:block;font-size:9px;letter-spacing:2px;font-weight:600;color:#8a95a6;margin-top:1px}.brand-mark{background:var(--blue);width:41px;height:41px;border-radius:12px;color:#fff;display:grid;place-content:center;font-size:20px;padding-left:2px}.site-header nav{display:flex;align-items:center;gap:26px;white-space:nowrap;font-size:14px;height:100%}.site-header nav a{height:100%;display:flex;align-items:center;border-bottom:3px solid transparent;padding-top:3px;color:#687385}.site-header nav a.active{color:var(--blue);border-bottom-color:var(--blue);font-weight:600}.search-form{margin-left:auto;background:#f3f5f8;border:1px solid #edf0f4;border-radius:10px;display:flex;align-items:center;padding:10px 12px;gap:8px;width:305px}.search-form span{font-size:23px;line-height:18px;color:#687385}.search-form input{width:100%;border:0;background:transparent;outline:none;font-size:13px;min-width:0}.search-form kbd{border:1px solid #d7dce4;color:#9ba4b4;padding:0 5px;border-radius:4px;background:#fff}.manage-link{font-size:13px;white-space:nowrap;font-weight:600}.manage-link span{margin-left:5px;color:var(--blue)}main{max-width:1400px;margin:0 auto;padding:38px 28px 64px;min-height:calc(100vh - 165px)}.demo-banner{background:#fff8e6;color:#8c6823;text-align:center;padding:10px 20px;font-size:12px}.eyebrow{font-size:11px;letter-spacing:2px;color:var(--blue);font-weight:750;margin-bottom:12px;display:flex;align-items:center;gap:8px}.eyebrow:before{content:"";width:22px;height:2px;background:var(--blue)}.page-intro{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:24px;gap:25px}.page-intro h1{margin-bottom:10px}.page-intro p{font-size:14px;color:var(--muted);margin:0}.pill{border:1px solid #dce3ef;background:#fff;border-radius:50px;padding:8px 12px;font-size:11px;white-space:nowrap;color:#647189}.pill:before{content:"";display:inline-block;width:6px;height:6px;background:#28a777;border-radius:50%;margin-right:7px}.featured{display:grid;grid-template-columns:1.45fr 1fr;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin:30px 0 34px;min-height:315px}.feature-visual{position:relative;background:#101e35;min-height:315px;overflow:hidden}.feature-visual img{width:100%;height:100%;position:absolute;object-fit:cover;transition:transform .35s}.feature-visual:hover img{transform:scale(1.025)}.play-bubble{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:65px;height:65px;border-radius:50%;background:#ffffffdf;color:#243c8c;box-shadow:0 5px 25px #10274630;font-size:20px;padding-left:3px}.feature-overlay{position:absolute;bottom:20px;left:24px;color:#fff;font-size:12px;background:#ffffff18;border:1px solid #ffffff33;padding:7px 12px;border-radius:7px;backdrop-filter:blur(8px)}.duration-badge{position:absolute;right:14px;bottom:14px;background:#0c1327db;color:white;padding:4px 7px;border-radius:5px;font-size:11px;font-variant-numeric:tabular-nums}.feature-text{padding:34px 36px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center}.feature-text h2{font-size:25px;line-height:1.55;margin-bottom:12px}.feature-text p{color:var(--muted);font-size:13px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:22px}.feature-tag{font-size:11px;letter-spacing:1px;color:var(--blue);background:var(--blue-soft);padding:5px 8px;border-radius:5px;margin-bottom:14px}.feature-meta{font-size:12px;color:#8b96a5;margin-bottom:22px}.button{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 16px;border-radius:9px;background:#fff;border:1px solid var(--line);color:var(--ink);font-size:13px;font-weight:550;white-space:nowrap}.button:hover{background:#f2f5fb}.button.primary{background:var(--blue);border-color:var(--blue);color:#fff}.button.primary:hover{background:#274bd1}.button.danger{color:#bd4141}.button.ghost{background:transparent;border-color:transparent;color:var(--muted)}.section-head{display:flex;justify-content:space-between;align-items:center;margin:28px 0 18px;gap:20px}.section-head h2{margin:0}.section-head .muted{font-size:12px}.filters{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:22px}.chips{display:flex;gap:9px;flex-wrap:wrap}.chip{padding:8px 15px;border-radius:8px;background:#fff;border:1px solid var(--line);font-size:12px;color:#657086}.chip.active{background:var(--ink);color:white;border-color:var(--ink)}.sort-select{border:0;background:transparent;color:#758195;font-size:12px;padding:7px}.video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.video-card{border:1px solid var(--line);border-radius:13px;background:#fff;overflow:hidden;transition:transform .18s,box-shadow .18s;min-width:0}.video-card:hover{transform:translateY(-4px);box-shadow:0 10px 30px #1a2d5710}.thumb{display:block;aspect-ratio:16/9;background:#172844;position:relative;overflow:hidden}.thumb img{height:100%;width:100%;object-fit:cover}.thumb .small-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);border-radius:50%;background:#fffdfc;color:#263d67;width:44px;height:44px;display:grid;place-items:center;font-size:15px;padding-left:2px;opacity:0;transition:.2s}.thumb:hover .small-play{opacity:1}.card-body{padding:18px 20px 17px}.card-category{font-size:10px;color:#5570ab;margin-bottom:8px;letter-spacing:.5px}.card-body h3{line-height:1.5;margin:0 0 8px;font-size:16px}.card-body p{font-size:12px;line-height:1.6;color:var(--muted);margin:0 0 17px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.card-meta{display:flex;justify-content:space-between;color:#8b96a5;font-size:11px}.card-meta button{background:transparent;color:#8491a7;padding:0 1px;font-size:14px}.card-meta button.saved{color:var(--blue)}.guide-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;background:#edf1f8;border:1px solid #e2e8f2;border-radius:12px;padding:23px 26px;margin-top:35px}.guide-strip h3{font-size:13px;margin:0 0 6px}.guide-strip p{font-size:12px;color:var(--muted);margin:0}.guide-num{display:block;color:#788ac0;font-size:10px;letter-spacing:2px;margin-bottom:8px}.site-footer{max-width:1400px;margin:0 auto;border-top:1px solid var(--line);padding:25px 28px;display:flex;justify-content:space-between;font-size:11px;color:#929cab;gap:20px}.breadcrumb{font-size:12px;color:#8b94a4;margin:0 0 22px}.breadcrumb a{color:#61708c}.watch-layout{display:grid;grid-template-columns:minmax(0,1fr) 325px;gap:25px;align-items:start}.player-shell{background:#0b1018;border-radius:13px;overflow:hidden;border:1px solid #1e293a;position:relative}.player-shell video{display:block;width:100%;aspect-ratio:16/9;background:#0b1018;max-height:80vh}.player-toolbar{display:flex;align-items:center;gap:8px;padding:12px 14px;flex-wrap:wrap;background:#151d2a}.player-toolbar button,.player-toolbar select{background:#253044;color:#e3e9f5;border:1px solid #344054;border-radius:6px;padding:7px 10px;font-size:12px}.player-toolbar select{margin-left:auto}.player-toolbar button:hover{background:#364661}.player-notice{color:#7586a3;font-size:11px;margin:10px 0 20px;line-height:1.7}.watch-heading{display:flex;gap:20px;justify-content:space-between;margin-top:22px;align-items:flex-start}.watch-heading h1{font-size:25px;letter-spacing:-.3px;margin-bottom:9px;line-height:1.5}.watch-actions{display:flex;gap:8px;margin:18px 0;flex-wrap:wrap}.tag-list{display:flex;gap:7px;flex-wrap:wrap;margin-top:18px}.tag{font-size:11px;padding:5px 10px;border-radius:5px;background:#edf1f8;color:#6980a8}.description-box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:23px;margin-top:22px}.description-box h2{font-size:16px;margin-bottom:14px}.description-box p{font-size:13px;color:#67758c;white-space:pre-wrap;overflow-wrap:anywhere;margin:0}.side-panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:21px;margin-bottom:18px}.side-panel h2{font-size:16px;display:flex;justify-content:space-between;align-items:center;margin-bottom:18px}.side-panel h2 span{font-size:11px;color:var(--muted);font-weight:400}.chapter-list{display:grid;gap:6px}.chapter{display:flex;align-items:center;gap:12px;text-align:left;padding:12px 10px;border-radius:8px;background:transparent;border:1px solid transparent;font-size:12px;color:#67768c;line-height:1.5}.chapter time{font-size:11px;color:#94a1b6;font-variant-numeric:tabular-nums;white-space:nowrap}.chapter.active{background:var(--blue-soft);color:var(--blue);border-color:#dfe6ff}.chapter.active time{color:var(--blue)}.related-card{display:flex;gap:12px;align-items:center;margin-top:16px}.related-card img{width:100px;height:60px;object-fit:cover;border-radius:7px;background:#e9edf7}.related-card h3{font-size:12px;line-height:1.6;margin:0 0 5px}.related-card p{font-size:10px;color:#97a0af;line-height:1.4;margin:0}.theater .watch-layout{grid-template-columns:1fr}.theater .watch-sidebar{display:block}.theater .player-shell video{max-height:76vh}.empty-state,.loading{background:#fff;padding:60px 28px;text-align:center;border:1px solid var(--line);border-radius:14px}.empty-state h2{font-size:20px}.empty-state p{font-size:13px;color:var(--muted)}.loading{color:var(--muted)}.toast{position:fixed;bottom:35px;left:50%;transform:translateX(-50%);z-index:100;max-width:90vw;padding:13px 22px;border-radius:10px;background:#18273dec;color:#fff;box-shadow:0 8px 35px #0e1d4330;font-size:13px;text-align:center;line-height:1.6}.resume-bar{background:#eef3ff;border:1px solid #dbe6ff;border-radius:9px;color:#5367a8;padding:10px 14px;display:flex;align-items:center;gap:15px;font-size:12px;margin:12px 0}.resume-bar button{background:transparent;color:var(--blue);font-size:12px;font-weight:600}.admin-grid{display:grid;grid-template-columns:1fr 340px;gap:24px}.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:25px}.panel h2{font-size:18px;margin-bottom:20px}.field{display:flex;flex-direction:column;gap:8px;margin-bottom:17px;font-size:12px;color:#5b6a81}.field input,.field textarea,.field select{width:100%;background:#f9fafc;border:1px solid #dfe5ee;border-radius:8px;padding:11px 12px;color:#334359;min-width:0}.field textarea{resize:vertical;min-height:100px;line-height:1.7}.field small{font-size:11px;line-height:1.7;color:#95a0af}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}.upload-zone{border:1px dashed #aebde5;background:#f5f7ff;border-radius:10px;padding:22px;margin-bottom:22px;font-size:13px;color:#677da8}.upload-zone input{margin-top:12px;display:block;max-width:100%;font-size:12px}.admin-note{font-size:12px;color:var(--muted);line-height:1.9}.admin-note strong{color:#3c4e70}.progress{width:100%;height:9px;border:0;border-radius:6px;overflow:hidden;margin:14px 0;accent-color:var(--blue)}.status-line{font-size:12px;white-space:pre-line;line-height:1.8;color:#687c9c}.admin-item{padding:18px 0;border-bottom:1px solid var(--line);display:flex;gap:15px;align-items:center}.admin-item img{width:110px;border-radius:8px;aspect-ratio:16/9;object-fit:cover}.admin-item>div{flex:1;min-width:0}.admin-item h3{font-size:14px;margin:0 0 7px;overflow-wrap:anywhere}.admin-item p{font-size:11px;color:#8c98aa;margin:0}.admin-item .actions{display:flex;gap:7px;flex-wrap:wrap;flex:0 1 300px;justify-content:flex-end}.admin-item .button{font-size:11px;padding:7px 10px}.banner-note{font-size:12px;color:#987037;background:#fff7e5;padding:13px 16px;border-radius:9px;line-height:1.8;margin:20px 0}.load-more{margin:25px auto 0;display:flex}.skip-link{position:fixed;top:-100px;left:15px;background:white;padding:12px;z-index:1000}.skip-link:focus{top:10px}dialog{border:1px solid var(--line);border-radius:15px;padding:30px;max-width:550px;width:90%;color:var(--ink);box-shadow:0 25px 100px #172e6a33}dialog::backdrop{background:#17233580}dialog p{font-size:13px;color:#758195}dialog h2{font-size:20px}.file-local{display:inline-flex;align-items:center;gap:8px;margin:8px 0;font-size:12px;color:#7182a3}.file-local input{max-width:250px;font-size:11px}[hidden]{display:none!important}
@media(min-width:1550px){main{padding-left:0;padding-right:0}.site-footer{padding-left:0;padding-right:0}}
@media(max-width:1150px){.site-header{padding:0 24px;gap:22px}.search-form{width:245px}.site-header nav{gap:18px}.watch-layout{grid-template-columns:minmax(0,1fr) 280px}.feature-text{padding:25px}.feature-text h2{font-size:22px}.admin-grid{grid-template-columns:1fr 290px}}
@media(max-width:900px){.search-form{max-width:250px}.site-header{height:76px;gap:20px}.site-header nav{display:none}.watch-layout,.admin-grid{grid-template-columns:1fr}.watch-sidebar{display:block}.feature-text{padding:22px}.feature-text h2{font-size:20px}.feature-visual{min-height:290px}.video-grid{gap:15px}.card-body{padding:15px}.card-body h3{font-size:14px}.admin-note{margin:0}.site-footer{font-size:10px}.guide-strip{gap:20px;padding:20px}.watch-heading h1{font-size:23px}}
@media(max-width:650px){.site-header{height:auto;min-height:74px;padding:15px 18px;gap:12px;flex-wrap:wrap;position:relative}.brand{font-size:22px}.brand-mark{width:37px;height:37px}.manage-link{margin-left:auto;font-size:12px}.search-form{order:3;width:100%;max-width:none;padding:8px 10px}.site-header nav{display:flex;order:4;height:35px;width:100%;justify-content:space-around;margin-top:5px;font-size:12px}.search-form kbd{display:none}.demo-banner{font-size:10px;padding:9px 18px;text-align:left}main{padding:28px 18px 45px}.page-intro{align-items:flex-start;margin-bottom:20px}.page-intro h1{font-size:28px;letter-spacing:-.5px}.page-intro p{font-size:12px}.page-intro .pill{display:none}.eyebrow{font-size:9px;margin-bottom:10px}.featured{grid-template-columns:1fr;margin:23px 0 27px}.feature-visual{min-height:0;aspect-ratio:16/9}.feature-text{padding:23px}.feature-text h2{font-size:21px}.feature-text p{-webkit-line-clamp:2;margin-bottom:15px}.feature-meta{margin-bottom:17px}.feature-tag{font-size:10px;margin-bottom:10px}.feature-overlay{font-size:10px;left:16px;bottom:15px}.play-bubble{width:54px;height:54px;font-size:17px}.video-grid{grid-template-columns:1fr;gap:20px}.card-body{padding:19px}.card-body h3{font-size:17px}.card-body p{font-size:12px}.section-head h2{font-size:20px}.section-head{margin-top:22px}.section-head .muted{font-size:11px}.filters{align-items:flex-start;gap:6px}.chips{gap:6px}.chip{font-size:11px;padding:7px 10px}.sort-select{font-size:11px;padding-right:0;max-width:85px}.guide-strip{grid-template-columns:1fr;gap:22px;padding:23px}.guide-strip>div{border-bottom:1px solid #dce3ee;padding-bottom:15px}.guide-strip>div:last-child{border:0;padding-bottom:0}.guide-num{float:left;margin:2px 12px 24px 0}.site-footer{padding:23px 18px;flex-direction:column;gap:10px}.watch-sidebar,.theater .watch-sidebar{display:block}.watch-layout{gap:22px}.watch-heading h1{font-size:21px}.player-toolbar{gap:5px;padding:10px}.player-toolbar button,.player-toolbar select{padding:7px 8px;font-size:11px}.player-toolbar select{margin-left:0}.watch-actions .button{padding:9px 12px;font-size:12px}.description-box{padding:20px}.breadcrumb{margin-bottom:17px;font-size:11px}.panel{padding:20px}.field-row{grid-template-columns:1fr;gap:0}.admin-item{flex-wrap:wrap}.admin-item img{width:90px}.admin-item .actions{flex-basis:100%;justify-content:flex-start}.button{font-size:12px}.feature-text .button{padding:10px 15px}.page-intro>div{min-width:0}.resume-bar{align-items:flex-start;flex-wrap:wrap;gap:5px 12px}.player-notice{font-size:10px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

.centered{justify-content:center}.keyboard-hint{margin-top:22px;margin-bottom:0}.admin-guide{grid-template-columns:1fr;margin-top:0}.content-management{margin-top:24px}.flush-top{margin-top:0}
@media(max-width:600px){.file-local{display:flex;flex-direction:column;align-items:flex-start;gap:9px}.file-local input{max-width:100%;width:100%}.file-local span{line-height:1.6}}

.user-bar{display:flex;align-items:center;gap:12px;margin-left:auto;white-space:nowrap}
.user-badge{font-size:12px;font-weight:600;color:var(--ink);display:inline-flex;align-items:center;gap:6px;padding:5px 10px;background:#f0f3f8;border-radius:20px;border:1px solid var(--line)}
.user-badge .role-tag{font-size:10px;padding:2px 6px;border-radius:4px;font-weight:700}
.role-tag.admin{background:var(--blue-soft);color:var(--blue)}
.role-tag.user{background:#e2e8f0;color:#475569}
.login-wrapper{display:flex;justify-content:center;align-items:center;min-height:calc(100vh - 240px);padding:20px}
.login-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px;width:100%;max-width:440px;box-shadow:0 12px 36px #10274610}
.login-brand{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.login-brand h2{margin:0;font-size:20px}
.login-brand small{font-size:10px;letter-spacing:1px}
.login-desc{font-size:13px;color:var(--muted);line-height:1.7;margin-bottom:24px}
.login-error,.form-error{background:#fff1f1;color:#b91c1c;border:1px solid #fecaca;padding:10px 14px;border-radius:8px;font-size:12px;margin-bottom:16px;line-height:1.6}
.login-submit{width:100%;padding:12px;font-size:14px;margin-top:6px}
.login-hint{margin-top:24px;padding-top:18px;border-top:1px dashed var(--line);font-size:12px;color:#6b7280;line-height:1.8}
.dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}
.user-management-section{margin-top:28px}
.user-list{display:flex;flex-direction:column;gap:12px}
.user-row{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border:1px solid var(--line);border-radius:10px;background:#fafbfc;gap:15px;flex-wrap:wrap}
.user-info{display:flex;align-items:center;gap:12px}
.user-name{font-weight:600;font-size:14px}
.user-meta{font-size:11px;color:var(--muted)}
.user-actions{display:flex;align-items:center;gap:8px}
@media(max-width:900px){.user-bar{gap:8px}.user-badge{font-size:11px;padding:4px 8px}}
@media(max-width:650px){.user-bar{order:2;margin-left:0;width:100%;justify-content:space-between;padding-top:8px;border-top:1px solid var(--line)}}

.button.small{padding:5px 10px;font-size:11px;border-radius:6px}
.meta-extra-info{margin-top:10px;padding:10px 14px;background:#f8fafc;border:1px solid var(--line);border-radius:10px;display:flex;flex-direction:column;gap:8px}
.cover-preview-box{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.cover-preview-img{width:110px;aspect-ratio:16/9;object-fit:cover;border-radius:8px;border:1px solid var(--line);background:#101e35}
.success-text{color:#15803d;font-size:12px;font-weight:600}
.meta-preview-actions{display:flex;align-items:center;gap:10px}

/* 视频留言区 */
.comments-section{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px;margin-top:24px;scroll-margin-top:100px}
.comments-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
.comments-header h2{font-size:17px;margin:0;display:flex;align-items:center;gap:8px}
.comments-count-badge{background:var(--blue-soft);color:var(--blue);padding:2px 8px;border-radius:12px;font-size:12px;font-weight:600}
.comment-form{margin-bottom:24px}
.comment-form textarea{width:100%;min-height:80px;padding:12px;border-radius:8px;border:1px solid #dfe5ee;background:#f9fafc;font-size:13px;line-height:1.6;resize:vertical;box-sizing:border-box;transition:border-color .2s,box-shadow .2s}
.comment-form textarea:focus{border-color:var(--blue);background:#fff;outline:none;box-shadow:0 0 0 3px #8ca3ff33}
.comment-form-actions{display:flex;justify-content:space-between;align-items:center;margin-top:10px}
.comments-list{display:flex;flex-direction:column;gap:16px}
.comment-item{border-bottom:1px solid #f1f4f8;padding-bottom:16px}
.comment-item:last-child{border-bottom:none;padding-bottom:0}
.comment-meta{display:flex;align-items:center;gap:10px;margin-bottom:8px;font-size:12px}
.comment-user{font-weight:600;color:var(--ink);display:inline-flex;align-items:center;gap:6px}
.comment-time{color:var(--muted);font-size:11px;margin-left:auto}
.comment-del-btn{color:#e11d48;background:transparent;border:none;font-size:11px;padding:2px 6px;cursor:pointer;border-radius:4px}
.comment-del-btn:hover{background:#fee2e2}
.comment-body{font-size:13px;color:#374151;line-height:1.7;word-break:break-word;white-space:pre-wrap;margin:0}

/* 访客与播放统计面板 */
.analytics-section{margin-top:28px}
.analytics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px}
.stat-card{background:#fafbfc;border:1px solid var(--line);border-radius:12px;padding:18px 20px}
.stat-label{font-size:12px;color:var(--muted);margin-bottom:6px;display:flex;align-items:center;gap:6px}
.stat-val{font-size:26px;font-weight:750;color:var(--ink);letter-spacing:-.5px}
.stat-sub{font-size:11px;color:#94a3b8;margin-top:4px}
.admin-table-wrapper{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:#fff;margin-top:12px}
.admin-table{width:100%;border-collapse:collapse;font-size:12px;text-align:left}
.admin-table th{background:#f8fafc;padding:12px 14px;font-weight:600;color:#475569;border-bottom:1px solid var(--line);white-space:nowrap}
.admin-table td{padding:12px 14px;border-bottom:1px solid #f1f5f9;color:#334155}
.admin-table tr:last-child td{border-bottom:none}
.admin-table tr:hover td{background:#f8fafc}
.device-pill{display:inline-flex;align-items:center;gap:5px;padding:2px 8px;background:#f1f5f9;border-radius:4px;font-size:11px;color:#475569}
.ip-code{font-family:monospace;font-size:11px;color:#64748b;background:#f1f5f9;padding:1px 5px;border-radius:3px}

/* 分类管理模块 */
.category-section{margin-top:28px}
.cat-row{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border:1px solid var(--line);border-radius:8px;background:#fafbfc;margin-bottom:8px;gap:12px;flex-wrap:wrap}
.cat-info{display:flex;align-items:center;gap:12px}
.cat-name{font-weight:600;font-size:13px}
.cat-badge{font-size:11px;color:var(--muted);background:#e2e8f0;padding:2px 7px;border-radius:4px}
.cat-actions{display:flex;gap:6px}

/* 视频简介精细排版与网页输出表格 */
.description-body{font-size:13.5px;color:#334155;line-height:1.85}
.desc-main-title{font-size:15px;font-weight:700;color:var(--blue);margin:0 0 20px;background:var(--blue-soft);padding:10px 16px;border-radius:8px;border-left:4px solid var(--blue);display:inline-block}
.desc-section-head{font-size:16px;font-weight:700;color:#0f172a;margin:28px 0 14px;padding:8px 0 8px 12px;border-left:4px solid var(--blue);background:#f8fafc;border-radius:0 6px 6px 0;letter-spacing:-.2px}
.desc-sub-head{font-size:14.5px;font-weight:650;color:#1e3a8a;margin:22px 0 10px}
.desc-sub2-head{font-size:13.5px;font-weight:600;color:#334155;margin:16px 0 8px}
.desc-para{margin:0 0 16px;line-height:1.85;color:#475569;word-break:break-word}
.desc-para:last-child{margin-bottom:0}
.flow-arrow{text-align:center;font-size:20px;color:var(--blue);font-weight:bold;margin:8px 0;user-select:none}

/* 网页输出表格 (Responsive Web Data Table) */
.desc-table-wrap{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:22px 0;border:1px solid #e2e8f0;border-radius:10px;background:#fff;box-shadow:0 2px 10px rgba(15,23,42,0.03)}
.desc-table{width:100%;border-collapse:collapse;font-size:12.5px;line-height:1.65;text-align:left;min-width:680px}
.desc-table th{background:#f8fafc;color:#1e293b;font-weight:650;padding:12px 16px;border-bottom:2px solid #cbd5e1;white-space:nowrap;letter-spacing:.3px}
.desc-table td{padding:12px 16px;border-bottom:1px solid #f1f5f9;color:#334155;vertical-align:top}
.desc-table tbody tr:last-child td{border-bottom:none}
.desc-table tbody tr:nth-child(even){background:#fbfcfe}
.desc-table tbody tr:hover{background:#f1f5fd}
.desc-table td strong{color:var(--blue);font-weight:600}
.desc-table td code{background:#f1f5f9;color:#0f172a;padding:1px 5px;border-radius:4px;font-size:11.5px}

/* 管理中心折叠卡片与工具栏 */
.admin-toolbar{display:flex;align-items:center;justify-content:space-between;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:12px 18px;margin:16px 0 22px;gap:12px;flex-wrap:wrap}
.admin-toolbar-info{font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:8px}
.admin-toolbar-actions{display:flex;align-items:center;gap:8px}
.collapsible-panel{border:1px solid var(--line);border-radius:12px;background:#fff;margin-bottom:24px;transition:box-shadow .2s;overflow:hidden}
.collapsible-panel:hover{box-shadow:0 4px 16px rgba(15,23,42,0.04)}
.panel-fold-header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;background:#fafbfc;cursor:pointer;user-select:none;border-bottom:1px solid var(--line);transition:background .2s}
.panel-fold-header:hover{background:#f1f5f9}
.panel-fold-left{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.panel-fold-left h2{margin:0;font-size:16px;color:#0f172a;display:inline-flex;align-items:center;gap:8px}
.panel-fold-badge{font-size:11px;color:#475569;background:#e2e8f0;padding:2px 8px;border-radius:6px;font-weight:normal}
.panel-fold-actions{display:flex;align-items:center;gap:10px}
.panel-fold-btn{display:inline-flex;align-items:center;gap:4px;font-size:12px;color:var(--blue);background:var(--blue-soft);border:none;padding:5px 12px;border-radius:6px;cursor:pointer;font-weight:600;transition:all .2s}
.panel-fold-btn:hover{background:#dbeafe}
.collapsible-panel.collapsed .panel-fold-header{border-bottom:none}
.collapsible-panel.collapsed .panel-fold-btn{color:#64748b;background:#f1f5f9}
.collapsible-panel.collapsed .panel-fold-body{display:none}
.panel-fold-body{padding:22px}

/* 个人设置弹窗与强制修改密码弹窗 */
.profile-dialog{max-width:480px;width:90%;border-radius:14px;padding:24px 28px;border:1px solid var(--line);box-shadow:0 16px 40px rgba(15,23,42,0.12)}
.dialog-header-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.dialog-header-row h2{margin:0;font-size:18px}
.close-x{background:none;border:none;font-size:18px;color:#94a3b8;cursor:pointer;padding:4px 8px;border-radius:6px}
.close-x:hover{background:#f1f5f9;color:#0f172a}
.profile-tabs{display:flex;border-bottom:2px solid #e2e8f0;margin-bottom:20px;gap:8px}
.profile-tab-btn{background:none;border:none;border-bottom:2px solid transparent;margin-bottom:-2px;padding:8px 16px;font-size:13.5px;font-weight:600;color:#64748b;cursor:pointer;transition:all .2s}
.profile-tab-btn.active{color:var(--blue);border-bottom-color:var(--blue)}
.profile-tab-pane{display:none}
.profile-tab-pane.active{display:block}
.muted-input{background:#f1f5f9!important;color:#64748b!important;cursor:not-allowed}

/* 强制修改密码弹窗 (Force Password Modal) */
.force-dialog{max-width:480px;width:92%;border-radius:14px;padding:28px;border:2px solid #f59e0b;box-shadow:0 20px 50px rgba(15,23,42,0.2)}
.force-dialog::backdrop{background:rgba(15,23,42,0.75);backdrop-filter:blur(4px)}
.force-header{display:flex;gap:14px;margin-bottom:18px;align-items:flex-start}
.force-icon{font-size:28px;line-height:1}
.force-header h2{margin:0 0 6px;font-size:18px;color:#92400e}
.force-desc{font-size:12.5px;color:#78350f;line-height:1.6;margin:0}
.force-desc code{background:#fef3c7;padding:1px 5px;border-radius:4px;font-weight:bold;color:#b45309}
.force-submit-btn{width:100%;margin-top:12px;padding:12px;font-size:14px;background:#d97706;border-color:#d97706}
.force-submit-btn:hover{background:#b45309;border-color:#b45309}

/* 播放器智能续播浮层 Toast */
.player-resume-toast{position:absolute;bottom:64px;left:20px;z-index:25;display:flex;align-items:center;gap:12px;background:rgba(15,23,42,0.92);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.18);box-shadow:0 12px 36px rgba(0,0,0,0.45);color:#f8fafc;padding:10px 16px;border-radius:10px;font-size:13px;animation:resumeSlideUp .3s ease}
@keyframes resumeSlideUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
.player-resume-toast .resume-time{color:#60a5fa;font-weight:700}
.player-resume-toast .resume-btn-go{background:var(--blue);color:#fff;padding:6px 14px;border-radius:6px;font-size:12px;font-weight:600;border:none;cursor:pointer;transition:background .2s}
.player-resume-toast .resume-btn-go:hover{background:#2563eb}
.player-resume-toast .resume-btn-close{background:transparent;color:#94a3b8;border:none;font-size:16px;cursor:pointer;padding:2px 6px;line-height:1;border-radius:4px}
.player-resume-toast .resume-btn-close:hover{color:#fff;background:rgba(255,255,255,0.1)}

/* 侧边栏 Tab 标签切换 */
.watch-sidebar-tabs{display:flex;gap:6px;background:#f1f5f9;padding:4px;border-radius:10px;margin-bottom:16px;border:1px solid var(--line)}
.watch-sidebar-tab-btn{flex:1;text-align:center;padding:8px 6px;font-size:12px;font-weight:600;color:#64748b;border-radius:7px;border:none;background:transparent;cursor:pointer;transition:all .2s;white-space:nowrap}
.watch-sidebar-tab-btn:hover{color:var(--ink)}
.watch-sidebar-tab-btn.active{background:#fff;color:var(--blue);box-shadow:0 2px 6px rgba(0,0,0,0.06)}
.watch-sidebar-pane{display:none}
.watch-sidebar-pane.active{display:block}

/* 随堂笔记模块 (Notes Timeline) */
.notes-panel-header{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
.btn-add-note-mark{display:flex;align-items:center;justify-content:center;gap:6px;background:var(--blue-soft);color:var(--blue);border:1px dashed #93c5fd;padding:10px 14px;border-radius:8px;font-size:12.5px;font-weight:600;cursor:pointer;transition:all .2s;width:100%}
.btn-add-note-mark:hover{background:#dbeafe;border-color:var(--blue)}
.note-composer-box{background:#f8fafc;border:1px solid #cbd5e1;border-radius:8px;padding:12px;margin-bottom:14px}
.note-composer-header{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#475569;margin-bottom:8px}
.note-timestamp-chip{background:#e0e7ff;color:#3730a3;padding:2px 8px;border-radius:4px;font-weight:600;font-size:11.5px}
.note-composer-textarea{width:100%;min-height:75px;border:1px solid #cbd5e1;border-radius:6px;padding:8px 10px;font-size:12.5px;line-height:1.5;resize:vertical;box-sizing:border-box;background:#fff}
.note-composer-textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 2px #8ca3ff33}
.note-composer-actions{display:flex;justify-content:space-between;align-items:center;margin-top:8px}
.notes-timeline{display:flex;flex-direction:column;gap:10px;max-height:500px;overflow-y:auto;padding-right:4px}
.note-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:11px 13px;transition:border-color .2s,box-shadow .2s}
.note-card:hover{border-color:#cbd5e1;box-shadow:0 2px 8px rgba(0,0,0,0.04)}
.note-card-meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.note-seek-btn{display:inline-flex;align-items:center;gap:4px;background:#eff6ff;color:var(--blue);border:1px solid #dbeafe;padding:2px 8px;border-radius:4px;font-size:11px;font-weight:600;cursor:pointer;transition:all .15s}
.note-seek-btn:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.note-date-text{font-size:10.5px;color:#94a3b8}
.note-card-content{font-size:12.5px;color:#334155;line-height:1.6;white-space:pre-wrap;word-break:break-word;margin:0 0 8px}
.note-item-actions{display:flex;justify-content:flex-end;gap:6px}
.note-action-btn{background:transparent;border:none;font-size:11px;color:#64748b;cursor:pointer;padding:2px 6px;border-radius:4px}
.note-action-btn:hover{background:#f1f5f9;color:var(--ink)}
.note-action-btn.del:hover{background:#fee2e2;color:#dc2626}

/* 视频卡片进度条与徽章 */
.thumb-status-badge{position:absolute;top:10px;right:10px;padding:3px 8px;border-radius:6px;font-size:11px;font-weight:700;letter-spacing:.2px;backdrop-filter:blur(6px);box-shadow:0 4px 12px rgba(0,0,0,0.25);z-index:2}
.badge-completed{background:#10b981;color:#fff}
.badge-in-progress{background:rgba(15,23,42,0.85);color:#38bdf8;border:1px solid rgba(56,189,248,0.3)}
.card-progress-track{position:absolute;bottom:0;left:0;right:0;height:4px;background:rgba(0,0,0,0.45);z-index:2}
.card-progress-fill{height:100%;background:var(--blue);transition:width .3s ease}
.card-progress-fill.completed{background:#10b981}

/* 学习档案弹窗 (Learning Profile Modal) */
.learning-dialog{max-width:760px;width:92%;max-height:85vh;display:flex;flex-direction:column}
.learning-stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}
.learning-stat-card{background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;padding:14px 16px;text-align:center}
.learning-stat-val{font-size:24px;font-weight:800;margin-bottom:4px}
.learning-stat-label{font-size:11.5px;color:#64748b}
.learning-actions-bar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:#f1f5f9;border-radius:8px;margin-bottom:16px;gap:10px;flex-wrap:wrap}
.learning-export-btns{display:flex;gap:8px}
.learning-notes-container{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:16px;padding-right:6px;max-height:460px}
.learning-group-card{border:1px solid var(--line);border-radius:10px;background:#fff;overflow:hidden}
.learning-group-header{background:#fafbfc;padding:12px 16px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:10px}
.learning-group-title{font-size:13.5px;font-weight:650;color:var(--ink)}
.learning-group-title a{color:var(--ink)}
.learning-group-title a:hover{color:var(--blue);text-decoration:underline}
.learning-group-notes{padding:12px 16px;display:flex;flex-direction:column;gap:10px}

/* 工具栏高亮记笔记按钮 */
.toolbar-note-btn{background:#4f46e5!important;color:#fff!important;font-weight:600!important;display:inline-flex!important;align-items:center!important;gap:5px!important;border-radius:6px!important;padding:6px 10px!important;transition:background .15s ease!important}
.toolbar-note-btn:hover{background:#4338ca!important}
.toolbar-note-btn kbd{background:rgba(255,255,255,0.25);color:#fff;padding:1px 4px;border-radius:3px;font-size:10px;font-family:inherit}

/* 播放页主区时间轴随堂笔记模块 (Interactive Main Notes & Timeline) */
.notes-main-section{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;margin-top:24px;margin-bottom:24px;box-shadow:0 4px 16px rgba(24,35,53,0.04);scroll-margin-top:100px}
.notes-main-header{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:10px}
.notes-main-title-wrap{display:flex;align-items:center;gap:10px}
.notes-main-title-wrap h2{font-size:18px;font-weight:750;margin:0;color:var(--ink);display:flex;align-items:center;gap:8px}
.notes-badge{background:var(--blue-soft);color:var(--blue);padding:3px 10px;border-radius:20px;font-size:12px;font-weight:700}
.notes-main-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.notes-main-subtitle{font-size:13px;color:var(--muted);line-height:1.6;margin-top:0;margin-bottom:20px;background:#f8fafc;padding:10px 14px;border-radius:8px;border-left:3px solid var(--blue)}
.notes-main-subtitle kbd{background:#e2e8f0;color:#1e293b;padding:2px 6px;border-radius:4px;font-size:11px;font-weight:600;border-bottom:2px solid #cbd5e1}

/* 内嵌快速打点编辑器 */
.main-note-composer{background:#f8fafc;border:1px solid #cbd5e1;border-radius:10px;padding:16px;margin-bottom:20px;animation:composerSlideDown .2s ease-out}
@keyframes composerSlideDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
.main-composer-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.main-composer-time{font-size:13px;font-weight:700;color:var(--blue);background:#dbeafe;padding:3px 10px;border-radius:6px}
.main-note-composer textarea{width:100%;min-height:90px;padding:12px;border-radius:8px;border:1px solid #cbd5e1;font-size:13.5px;line-height:1.6;box-sizing:border-box;background:#fff;resize:vertical;transition:border-color .15s,box-shadow .15s}
.main-note-composer textarea:focus{border-color:var(--blue);outline:none;box-shadow:0 0 0 3px rgba(53,91,236,0.15)}
.main-composer-footer{display:flex;align-items:center;justify-content:space-between;margin-top:12px}
.main-composer-btns{display:flex;gap:10px}

/* 主时间轴样式 */
.main-notes-timeline{position:relative;padding-left:28px;margin-top:16px}
.main-notes-timeline::before{content:"";position:absolute;left:10px;top:14px;bottom:14px;width:2px;background:#e2e8f0;border-radius:2px}
.main-notes-list{display:flex;flex-direction:column;gap:16px}
.main-note-row{position:relative;background:#ffffff;border:1px solid var(--line);border-radius:10px;padding:14px 18px;transition:all .2s ease}
.main-note-row:hover{border-color:#cbd5e1;box-shadow:0 4px 12px rgba(0,0,0,0.05);transform:translateX(2px)}
.main-note-row.highlight-pulse{animation:notePulse 1.2s ease-out 2}
@keyframes notePulse{0%{box-shadow:0 0 0 0 rgba(53,91,236,0.5);border-color:var(--blue)}70%{box-shadow:0 0 0 10px rgba(53,91,236,0)}100%{box-shadow:0 0 0 0 rgba(53,91,236,0)}}
.main-note-node{position:absolute;left:-24px;top:18px;width:12px;height:12px;border-radius:50%;background:#fff;border:3px solid var(--blue);box-shadow:0 0 0 2px #fff;z-index:1}
.main-note-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:8px}
.main-note-seek{display:inline-flex;align-items:center;gap:6px;background:#eff6ff;color:var(--blue);border:1px solid #bfdbfe;padding:4px 10px;border-radius:6px;font-size:12px;font-weight:700;cursor:pointer;transition:all .15s ease}
.main-note-seek:hover{background:var(--blue);color:#fff;border-color:var(--blue)}
.main-note-date{font-size:11.5px;color:#94a3b8}
.main-note-body{font-size:13.5px;color:#334155;line-height:1.7;white-space:pre-wrap;word-break:break-word;margin:0}
.main-note-bottom{display:flex;justify-content:flex-end;gap:8px;margin-top:10px;padding-top:8px;border-top:1px dashed #f1f5f9}
.main-note-btn{background:transparent;border:none;font-size:11.5px;color:#64748b;cursor:pointer;padding:3px 8px;border-radius:4px;transition:all .15s}
.main-note-btn:hover{background:#f1f5f9;color:var(--ink)}
.main-note-btn.del:hover{background:#fee2e2;color:#dc2626}
.main-note-empty{text-align:center;padding:36px 20px;background:#f8fafc;border:1px dashed #cbd5e1;border-radius:10px;color:#64748b}
.main-note-empty p{margin-bottom:12px;font-size:13.5px}