:root{--nx-bg:#efefed;--nx-surface:#e3e3e1;--nx-white:#fff;--nx-ink:#232322;--nx-muted:#62625e;--nx-accent:#7d0c14;--nx-light:#e2e2e2;--nx-line:#dededb;--nx-good:#146b57;--nx-font:"Microsoft YaHei","PingFang SC",Arial,sans-serif;--nx-display:"Microsoft YaHei","PingFang SC",Arial,sans-serif;--nx-gap:24px;color-scheme:light}
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/* 首页：句子里嵌入真实教学画面，随后打开同一镜头。 */
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/* 应用工作区：240px 导航 + 流动内容，内容区 2 × (50% - 12px) + 24px = 100%。 */
.nx-app{background:#f1f2ef}.nx-sidebar{position:fixed;left:0;top:0;bottom:0;width:240px;padding:30px 20px 20px;background:#f1f2ef;display:flex;flex-direction:column;z-index:40;border-right:1px solid #dedfda;overflow-y:auto}.nx-sidebar .nx-brand{gap:9px;padding:0 8px;margin-bottom:40px}.nx-sidebar .nx-brand>span{font-size:24px;display:block}.nx-sidebar .nx-brand small{display:block;font-size:12px;margin-top:3px}.nx-sidebar .nx-brand img{width:38px;height:38px}.nx-sidebar nav{display:flex;flex-direction:column;gap:5px}.nx-sidebar nav a{display:flex;align-items:center;gap:13px;min-height:44px;padding:9px 12px;font-size:14px;border-radius:6px;color:#50514c}.nx-sidebar nav a.active{background:#e1e2de;color:#181916;font-weight:600}.nx-sidebar nav a:hover{background:#e7e8e4;text-decoration:none}.nx-sidebar nav svg{width:18px;height:18px}.nx-side-secondary{display:flex;flex-direction:column;gap:4px;margin-top:28px;padding-top:22px;border-top:1px solid #dedfda}.nx-side-secondary a{font-size:13px;padding:7px 12px;display:flex;align-items:center;justify-content:space-between;color:#575952}.nx-side-bottom{margin-top:auto;padding:32px 12px 0}.nx-side-bottom>p{font-size:13px;color:#5f6259;margin-bottom:16px}.nx-side-bottom>.nx-small-link{display:block;margin-top:18px}.nx-app-body{margin-left:240px;min-height:100vh}.nx-app-header{height:80px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 40px;background:#f1f2ef}.nx-app-header>a{font-size:13px;color:#5f6259}.nx-search{display:flex;align-items:center;gap:12px;max-width:580px;width:65%;padding:8px 12px;background:#e6e7e2;border-radius:4px;height:40px}.nx-search svg{width:18px;height:18px;flex-shrink:0}.nx-search input{border:0;background:transparent;outline:none;min-width:0;flex:1;font-size:14px;color:#333}.nx-search kbd{font-family:var(--nx-font);font-size:13px;color:#64645e}.nx-canvas{padding:26px 40px 60px;max-width:1410px;margin:auto}.nx-title-row{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:30px}.nx-title-row h1{font-size:28px;font-weight:500;line-height:1.45;max-width:800px}.nx-title-row p{font-size:14px;line-height:1.8;color:var(--nx-muted);margin-top:10px;max-width:760px}.nx-title-row>.nx-button{margin-top:3px}.nx-app .nx-button{border-radius:5px;background:#262722;min-height:40px;padding:9px 17px}.nx-app .nx-button.secondary{background:#e5e6e1;color:#30312c}.nx-app .nx-button:disabled{background:#e2e3de;color:#65675f;opacity:1}.nx-section-head{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:18px}.nx-section-head h2{font-size:19px;font-weight:500}.nx-section-head>a{font-size:13px;color:#54564f}.nx-panel{background:#fff;border:1px solid #e3e4df;border-radius:8px;padding:24px;min-width:0}.nx-panel>h2,.nx-panel>h3{font-size:18px;font-weight:500;margin-bottom:16px}.nx-panel p{font-size:14px;line-height:1.85;color:#575951}.nx-panel .nx-button{margin-top:18px}.nx-two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:24px;align-items:start}.nx-empty{padding:56px 28px;background:#e8e9e4;border-radius:6px;text-align:center}.nx-empty h2{font-size:22px;font-weight:500;margin-bottom:14px}.nx-empty p{max-width:580px;margin:0 auto 18px;color:#5a5c54;font-size:14px;line-height:1.9}.nx-empty .nx-button{margin-top:10px}.nx-notice{padding:14px 18px;background:#e6e8e1;color:#464a3d;font-size:14px;line-height:1.85;margin-bottom:24px;border-radius:5px}.nx-notice a{text-decoration:underline}.nx-app-footer{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 40px;color:#5d6057;font-size:13px;border-top:1px solid #dddeda}.nx-learning-lead{display:grid;grid-template-columns:1fr 1fr;gap:28px;background:#e6e8e0;padding:30px;margin-bottom:36px;border-radius:8px;align-items:center}.nx-learning-lead h2{font-size:28px;font-weight:500;margin:12px 0 16px}.nx-learning-lead p{font-size:14px;line-height:1.85;max-width:500px;margin-bottom:20px}.nx-learning-lead>div>a{display:inline-flex;gap:15px;align-items:center;font-size:14px}.nx-learning-lead>img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:4px}.nx-path-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.nx-path-card{display:grid;grid-template-columns:38% 1fr;overflow:hidden;background:#fff;border-radius:6px;border:1px solid #e3e4df;min-width:0}.nx-path-card:hover{text-decoration:none;border-color:#9a9d91}.nx-path-card>img{width:100%;height:100%;object-fit:cover;min-height:220px}.nx-path-card>div{padding:22px}.nx-path-card h3{font-size:20px;font-weight:500;margin:7px 0 12px}.nx-path-card p{font-size:13px;color:#62645c}.nx-card-outcome{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:13px;margin-top:22px}.nx-list-row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0;border-bottom:1px solid #eee;font-size:14px}.nx-list-row:last-child{border-bottom:0}
/* 知识、资源、工具 */
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/* 课堂：媒体与板书同一舞台，知识、私人笔记分开持久化。 */
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@media(min-width:1700px){.nx-path-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.nx-knowledge-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}

/* Second review: a calm, readable search field and factual content counts. */
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/* Course replay: screen, transcript, and review share one reading rhythm. */
.nx-record-checkbox{display:flex;align-items:center;gap:9px;font-size:13px;line-height:1.7}.nx-record-checkbox input{width:16px;height:16px;margin:0;flex-shrink:0}
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.nx-replay-search{display:flex;align-items:end;gap:16px;max-width:860px}.nx-replay-search label{flex:1}.nx-replay-search input{margin-top:8px}.nx-replay-list{display:grid;gap:16px}.nx-replay-card{display:grid;grid-template-columns:144px minmax(0,1fr) auto;gap:24px;align-items:center;background:#fff;border:1px solid #dce0da;padding:24px;border-radius:8px}.nx-replay-card h2{font-size:22px;margin:6px 0 10px}.nx-replay-cover{height:104px;background:#e6eae2;display:flex;align-items:center;justify-content:center;position:relative;color:#315a48;border-radius:5px}.nx-replay-cover svg{width:34px;height:34px}.nx-replay-cover span{position:absolute;bottom:7px;right:9px;font-size:11px;font-variant-numeric:tabular-nums}.nx-search-hit{display:flex;gap:12px;margin-top:9px;font-size:14px;color:#395246}.nx-search-hit time{flex-shrink:0;font-variant-numeric:tabular-nums}.nx-replay-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:28px;align-items:start}.nx-replay-layout>section{min-width:0}.nx-replay-player{background:#141918;aspect-ratio:16/9;border-radius:8px;overflow:hidden;color:#fff}.nx-replay-player video{width:100%;height:100%;display:block}.nx-replay-meta{display:flex;justify-content:space-between;gap:12px;color:#647066;font-size:12px;margin:12px 0}.nx-replay-transcript{position:sticky;top:86px;background:#fff;border:1px solid #dce0da;border-radius:8px;padding:24px;max-height:calc(100vh - 108px);overflow:auto}.nx-replay-transcript h2{font-size:19px;margin:0}.nx-replay-transcript input{margin-top:10px;width:100%}.nx-transcript-line{display:grid;grid-template-columns:65px minmax(0,1fr);gap:12px;width:100%;text-align:left;border:0;background:transparent;padding:16px 10px;border-bottom:1px solid #edf0eb;line-height:1.8;font-size:14px;color:#35473d;border-radius:4px}.nx-transcript-line time{font-size:11px;color:#718078;font-variant-numeric:tabular-nums;padding-top:3px}.nx-transcript-line:hover,.nx-transcript-line.active{background:#edf4eb}.nx-note-link{display:block;border:0;background:none;text-align:left;color:#2c5b45;line-height:1.9;padding:6px 0}.nx-study-notes p{white-space:pre-wrap;margin:6px 0}.nx-replay-edit textarea{font-family:inherit;font-size:13px;line-height:1.8}.nx-replay-edit details{margin-top:20px}.nx-replay-edit summary,details.nx-panel summary,[data-recording-studio] summary{cursor:pointer;font-weight:600;padding:8px 0}.nx-replay-edit form{margin-top:20px}#replay-board{display:block;width:100%;height:auto;margin-top:18px;border:1px solid #e3e7df;border-radius:4px}[data-recording-studio] input,[data-recording-studio] select{max-width:100%}[data-recording-studio] details{margin-top:18px;border-top:1px solid #e2e7de;padding-top:12px}[data-record-status]{font-size:13px;line-height:1.8;overflow-wrap:anywhere}label:has(> [data-record-title]){display:block;margin:18px 0}
@media(max-width:1100px){.nx-replay-layout{grid-template-columns:minmax(0,1fr) 290px;gap:20px}.nx-replay-transcript{padding:18px}.nx-replay-card{grid-template-columns:112px minmax(0,1fr);gap:20px}.nx-replay-card>.nx-button{grid-column:2;justify-self:start}.nx-replay-cover{grid-row:1/3}}
@media(max-width:800px){.nx-replay-layout{grid-template-columns:1fr}.nx-replay-layout>section{display:contents}.nx-replay-layout .nx-spacing{margin-top:0}.nx-replay-transcript{position:static;max-height:360px;grid-row:3}.nx-replay-meta{flex-wrap:wrap;margin:0}.nx-replay-player video::cue{font-size:14px}.nx-replay-search{align-items:stretch;flex-direction:column}.nx-replay-search button{align-self:flex-start}.nx-replay-card{padding:18px;grid-template-columns:76px minmax(0,1fr);gap:14px}.nx-replay-cover{height:90px}.nx-replay-card h2{font-size:18px}.nx-search-hit{flex-direction:column;gap:3px}}

/* 第七期：学习区与官网同一套深蓝暖金 */
:root{--nx-bg:#faf8f3;--nx-surface:#f0ece3;--nx-ink:#17263b;--nx-muted:#4f5d70;--nx-accent:#101d33;--nx-light:#e8e1d2;--nx-line:#e2dfd6;--nx-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif}
::selection{background:#e9c98e;color:#101d33}
.nx-title-row h1,.nx-learning-lead h2,.nx-section-head h2,.nx-path-grid h3,.nx-panel h2{font-family:var(--nx-display);font-weight:600;letter-spacing:.02em}
.nx-sidebar{background:#101d33;color:#d4dae2;border-right:0}
.nx-sidebar .nx-brand>span{color:#fff;font-family:var(--nx-display)}.nx-sidebar .nx-brand small{color:#c7cfdb}
.nx-sidebar nav a{color:#c9d1dc}.nx-sidebar nav a:hover{background:#ffffff10;text-decoration:none}
.nx-sidebar nav a.active{background:#e9c98e1f;color:#e9c98e;box-shadow:inset 3px 0 0 #e9c98e}
.nx-side-secondary a,.nx-side-bottom,.nx-side-bottom p,.nx-small-link{color:#aab6c5}
.nx-side-secondary{border-color:#ffffff1a}
.nx-sidebar .nx-button{background:#e9c98e;color:#101d33}
.nx-sidebar .nx-user{color:#fff}.nx-sidebar .nx-user>span{background:#e9c98e;color:#101d33}
.nx-button{border-radius:3px}
.nx-search{background:#fff;border:1px solid var(--nx-line)}
.nx-learning-lead{background:#f0ece3}
.nx-app{background:var(--nx-bg)}.nx-button.secondary{background:#f0ece3}