:root{color-scheme:dark;--bg:#0c1513;--panel:#15291f;--ink:#f1ebd9;--muted:#b2c5b9;--accent:#ff7a43;--line:#355244}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,Arial,sans-serif}a{color:inherit}button,input,select{font:inherit}button,a{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.skip{position:absolute;top:-90px;left:20px;background:var(--accent);color:#101713;padding:12px;z-index:5}.skip:focus{top:8px}.shell{max-width:1500px;margin:auto;padding:0 4vw}.top{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-top:24px;padding-bottom:24px;border-bottom:1px solid var(--line)}.brand img{width:185px;max-width:42vw;display:block}.top nav{display:flex;flex-wrap:wrap;gap:12px 24px;font-size:14px}.top a{text-decoration:none}.top nav 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var(--line);padding:28px;border-radius:16px;margin-top:48px;background:var(--panel)}footer{border-top:1px solid var(--line);margin-top:48px;padding:25px 0 40px;font-size:13px;color:var(--muted)}footer a{margin-right:14px}.watch-head{padding:22px 0 16px}.breadcrumbs{font-size:13px;color:var(--muted)}.watch-head h1{font-size:clamp(28px,3.4vw,43px);margin:16px 0 10px}.watch-layout{display:grid;grid-template-columns:minmax(320px,1fr) minmax(290px,.9fr);gap:32px;align-items:start}.player-shell{display:flex;justify-content:center;background:#050a07;border:1px solid var(--line);border-radius:16px;overflow:hidden}.player-shell video{width:100%;max-height:76vh;aspect-ratio:9/16;display:block}.lesson-detail{max-height:76vh;overflow:auto;padding-right:10px}.chapters{display:grid;gap:7px;margin-top:20px}.chapter{text-align:left!important;justify-content:flex-start!important;font-size:14px;align-items:baseline!important}.chapter time{font-variant-numeric:tabular-nums;color:var(--accent);min-width:44px}.lesson-nav{display:flex;gap:12px;justify-content:space-between;margin:20px 0}.lesson-nav .btn{max-width:49%}.resources{display:flex;gap:20px;flex-wrap:wrap;font-size:14px}.transcript{padding:24px;border:1px solid var(--line);border-radius:14px;margin-top:24px}.transcript summary{cursor:pointer;font-weight:650}.transcript p{max-width:950px}.transcript h3{color:var(--ink)}.noscript{padding:14px;border:1px solid var(--accent)}.empty{padding:25px;border:1px dashed var(--line)}.english-note{font-size:13px;color:var(--muted)}@media(min-width:1100px){.player-shell{min-height:500px}}@media(max-width:760px){.shell{padding-left:18px;padding-right:18px}.top{align-items:flex-start;gap:16px}.top nav{justify-content:flex-end;gap:10px 14px;font-size:12px;max-width:53%}.hero{grid-template-columns:1fr;gap:10px;padding-top:30px}.statbox{padding:18px;display:flex;align-items:center;justify-content:space-between;gap:15px}.statbox 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