@font-face{font-family:Inter;src:url('./assets/Inter.woff2')}*{box-sizing:border-box}body{margin:0;background:#faf9f6;color:#20252d;font-family:Inter,system-ui,sans-serif}button,a,input{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer;border:0}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #505ea8;outline-offset:4px}header{max-width:1440px;margin:auto;padding:30px 42px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e4e3df}.brand{font-size:31px;font-weight:650;letter-spacing:-1.7px;color:inherit;text-decoration:none;display:flex;align-items:center;gap:25px}.brand span{font-size:10px;letter-spacing:2px;font-weight:600;border-left:1px solid #b8bbc2;padding:9px 0 9px 25px}.review-label{font-size:12px;color:#686e78}main{max-width:1440px;margin:auto;padding:40px 42px 22px}.intro{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:30px}.eyebrow{font-size:10px;letter-spacing:2px;color:#505ea8;font-weight:650;margin:0 0 12px}h1{font-size:clamp(27px,3vw,40px);letter-spacing:-1.5px;font-weight:500;margin:0}.intro>p{font-size:13px;color:#666e79;margin-bottom:4px}nav{display:flex;border-bottom:1px solid #dedfdc;gap:32px;margin-bottom:25px;overflow:auto}nav button{background:none;white-space:nowrap;padding:12px 0 18px;border-bottom:3px solid transparent;font-size:13px;color:#69717a}nav button.active{color:#505ea8;border-color:#505ea8;font-weight:650}nav button span{font-size:10px;margin-right:10px;opacity:.65}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:32px}.viewer{background:#f5f4f0;border:1px solid #e4e3df;border-radius:16px;overflow:hidden;min-width:0}.viewer-head{padding:23px 26px 0;display:flex;align-items:center;justify-content:space-between;gap:15px}h2{font-size:18px;font-weight:600;letter-spacing:-.4px;margin:0 0 5px}#exercise-meta{font-size:11px;color:#69717a;margin:0}.mode-tabs{display:flex;background:#e9e9e6;padding:3px;border-radius:8px;flex-shrink:0}.mode-tabs button{padding:8px 12px;font-size:11px;background:transparent;border-radius:6px}.mode-tabs button.active{background:#fffefa;box-shadow:0 1px 3px #20252d10}.stage{position:relative;height:440px}canvas{display:block;width:100%;height:100%;touch-action:none}#loading{position:absolute;inset:0;display:grid;place-items:center;background:#f5f4f0e8;font-size:14px;color:#505ea8}#loading[hidden]{display:none}#gesture-hint{position:absolute;bottom:5px;left:0;width:100%;text-align:center;color:#717783;font-size:10px;pointer-events:none}video{width:100%;height:100%;object-fit:contain;background:#f5f4f0}video[hidden]{display:none}.camera-row{padding:14px 22px;display:flex;gap:6px;border-top:1px solid #e0e0dc;flex-wrap:wrap}.camera-row button{font-size:11px;padding:8px 12px;border-radius:6px;background:transparent;color:#646c77}.camera-row button.active{background:#e4e7f4;color:#465397}#reset{margin-left:auto}.playback{padding:0 24px 20px;display:flex;align-items:center;gap:15px}.playback button{min-width:56px;padding:9px 10px;border-radius:7px;background:#505ea8;color:#fff;font-size:11px}.playback #speed{background:#e8e8e5;color:#424954;min-width:42px}input[type=range]{flex:1;min-width:40px;accent-color:#505ea8}#phase{font-size:10px;color:#666e79;min-width:54px;text-align:center}aside{padding:8px 0}aside .eyebrow{margin-bottom:22px}.lesson{display:flex;gap:12px;background:none;text-align:left;width:100%;padding:15px 0;border-top:1px solid #dedfdc}.lesson-number{font-size:11px;color:#505ea8;padding-top:3px}.lesson strong{font-weight:550;font-size:13px;line-height:1.5}.lesson p{font-size:12px;line-height:1.7;color:#69717a;margin:7px 0 0}.lesson.active strong{color:#505ea8}.note{border-top:1px solid #dedfdc;margin-top:15px;padding-top:20px;font-size:12px}.note strong{font-weight:600}.note p{color:#69717a;line-height:1.7;margin:6px 0 18px}.download{font-size:12px;color:#505ea8;text-decoration:none}.review-note{font-size:10px;line-height:1.6;color:#7b8088;margin-top:17px}footer{display:flex;justify-content:space-between;margin-top:25px;padding-top:15px;font-size:10px;color:#787f89}footer a{color:inherit;text-decoration:none}
@media(max-width:1000px){.workspace{grid-template-columns:minmax(0,1fr) 240px;gap:22px}header{padding:24px}main{padding:30px 24px}.intro>p{display:none}.stage{height:400px}.viewer-head{padding:20px 18px 0}.mode-tabs button{padding:8px}.camera-row{padding:12px}.playback{padding:0 15px 18px;gap:8px}}
@media(max-width:740px){header{padding:20px}.brand{font-size:28px;gap:15px}.brand span{font-size:9px;padding-left:15px}.review-label{font-size:10px}main{padding:26px 16px}.intro{margin-bottom:23px}h1{letter-spacing:-1px;font-size:29px}nav{gap:24px;margin-bottom:18px}nav button{font-size:12px}nav button span{display:none}.workspace{grid-template-columns:1fr;gap:28px}.stage{height:380px}.viewer-head{align-items:flex-start;flex-wrap:wrap;gap:14px}h2{font-size:16px}.mode-tabs{margin-left:auto}.camera-row{gap:2px}.camera-row button{padding:8px 9px;font-size:10px}.playback{gap:8px}aside{padding:0 6px}.lesson{padding:16px 0}.lesson strong{font-size:15px}.lesson p{font-size:13px}.note{display:none}.review-note{max-width:270px}footer{gap:20px;line-height:1.6}#gesture-hint{font-size:9px}}

canvas[hidden]{display:none}

@media(max-width:740px){.camera-row button,.playback button,.mode-tabs button{min-height:44px}.camera-row{gap:4px}.playback button{min-width:52px}}