:root{color-scheme:dark;--bg:#111819;--panel:#192223;--line:#344041;--text:#edf1e8;--muted:#9baaa6;--lime:#d5f477}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:14px}button,input,a{-webkit-tap-highlight-color:transparent}button,a,input{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--lime)}button{font:inherit;border:1px solid var(--line);border-radius:6px;color:var(--text);background:#222d2e;padding:10px 13px;cursor:pointer}button:hover{border-color:#9bad8c;background:#2c3937}button:disabled{opacity:.35;cursor:default}header{max-width:1440px;margin:auto;display:flex;justify-content:space-between;align-items:center;padding:26px 5%;border-bottom:1px solid 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8px;border-radius:3px;font-size:8px;letter-spacing:1.1px}.preview-caption{position:absolute;bottom:18px;left:20px;font-size:13px;letter-spacing:1px;color:#fff}.transport{display:flex;align-items:center;gap:15px;padding-top:13px}.transport button{padding:7px 12px;font-size:12px}.timecode{font-family:monospace;font-size:12px;color:var(--lime)}.transport-note{font-size:10px;color:var(--muted);margin-left:auto}#duration{font-family:monospace;font-size:11px;color:var(--muted)}aside{padding:27px 25px}aside p{color:#c1cbc3;font-size:13px;line-height:1.8;margin:18px 0}.goals{padding:0;list-style:none;margin:22px 0}.goals li{display:flex;gap:10px;align-items:flex-start;padding:11px 0;border-top:1px solid #303c3a;font-size:12px;line-height:1.6}.goal-mark{flex-shrink:0;display:grid;place-content:center;width:17px;height:17px;border:1px solid #637363;border-radius:50%;font-size:10px;color:var(--lime);margin-top:2px}.done 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p{margin:0;line-height:1.7}footer{display:flex;align-items:center;gap:20px;padding:25px 0 32px;font-size:10px;color:var(--muted)}.brand-small{font-size:15px;font-weight:700;color:var(--text)}footer button{margin-left:auto}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}@media(min-width:1450px){main{padding:0 10px}}@media(max-width:900px){.studio-grid{grid-template-columns:1.5fr 1fr}aside{padding:20px 18px}.viewer-area{padding:18px}.transport-note{display:none}.learn-note{grid-template-columns:auto 1fr}.level-card{padding:14px 10px;gap:8px}.level-best{display:none}.inspector{gap:10px}}@media(max-width:650px){header{padding:18px 20px}.beta,.local{display:none}main{padding:0 16px}.intro{padding-top:32px;gap:20px;align-items:flex-start}.intro p{font-size:12px}.course-meta{min-width:100px;width:100px;margin-top:7px}.course-meta strong{font-size:27px}.course-meta small{display:none}.course-meta 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