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rotateX(14deg)}.racer-road:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background-image:linear-gradient(180deg,rgba(226,232,240,.08),transparent 18%),radial-gradient(ellipse at 50% 68%,rgba(255,255,255,.06),rgba(255,255,255,.02) 55%,transparent),linear-gradient(180deg,#1e293b47,#0f172a1a);opacity:.9;animation:surfaceDrift calc(2.4s / var(--speed-multiplier, 1)) linear infinite}.racer-road:after{content:"";position:absolute;left:-8px;right:-8px;bottom:-8px;height:32px;background:linear-gradient(180deg,#0ea5e924,#0ea5e96b);pointer-events:none}.lane-marker{position:absolute;width:8px;top:-12%;height:140%;background:repeating-linear-gradient(to bottom,rgba(248,250,252,.9) 0 16px,rgba(248,250,252,.9) 16px 28px,transparent 28px 58px);background-size:100% 64px;filter:drop-shadow(0 0 8px rgba(226,232,240,.45));animation:laneFlow calc(.74s / var(--speed-multiplier, 1)) linear infinite;box-shadow:inset 0 0 0 1px #0000004d,0 0 0 4px #020617a6;transform:translate(-50%) 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#00000059}.racer-exit-button:hover{border-color:#38bdf8;color:#bae6fd}.racer-fullscreen-shell,.piano-fullscreen-shell{position:fixed;top:0;right:0;bottom:0;left:0;z-index:10000;pointer-events:auto}.racer-fullscreen__backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 50% 20%,rgba(30,41,59,.8),transparent 60%),#020617d9;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.racer-fullscreen__inner,.piano-fullscreen__inner{position:relative;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;padding:18px 16px 22px;z-index:1}.racer-fullscreen__header,.piano-fullscreen__header{width:min(1100px,95vw);display:flex;justify-content:space-between;align-items:center;margin:0 auto 12px;gap:10px;color:#e2e8f0}.piano-fullscreen__inner{justify-content:flex-start;gap:10px}.piano-fullscreen__header{width:min(1200px,96vw);margin-top:8px}.racer-overlay.hud{top:8px;left:50%;transform:translate(-50%);width:min(420px,calc(100% - 40px));padding:8px 12px;background:linear-gradient(180deg,#0f172ac7,#0f172a80);border:1px solid rgba(148,163,184,.32);border-radius:10px;display:flex;flex-direction:column;gap:8px;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);box-shadow:0 10px 26px #00000059}.progress{position:relative;width:100%;height:8px;background:#94a3b840;border:1px solid rgba(148,163,184,.35);border-radius:9999px;overflow:hidden}.progress-fill{position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(90deg,#0ea5e9,#22d3ee);box-shadow:0 0 8px #0ea5e973}.racer-footer{background:#0f172a99;border:1px solid rgba(56,189,248,.3);border-radius:10px;padding:10px 12px;box-shadow:inset 0 0 10px #38bdf814}.shake{animation:shake .35s ease}@keyframes shake{0%{transform:translate(2px)}25%{transform:translate(-3px,1px)}50%{transform:translate(3px,-1px)}75%{transform:translate(-2px,1px)}to{transform:translate(0)}}@keyframes damageFlash{0%{filter:brightness(1)}50%{filter:brightness(1.4) saturate(1.4)}to{filter:brightness(1)}}@keyframes streak{0%{background-position-y:0}to{background-position-y:64px}}@keyframes scroll{0%{background-position-y:0}to{background-position-y:48px}}@keyframes surfaceDrift{0%{background-position-y:0,0,0}to{background-position-y:48px,32px,0}}@keyframes laneFlow{0%{background-position-y:0}to{background-position-y:64px}}@keyframes playerBob{0%,to{transform:translate(-50%) translateY(0)}50%{transform:translate(-50%) translateY(-4px)}}.piano-challenge{--lane-count: 7;--white-count: 7;--piano-max-width: 1020px;--piano-horizontal-pad: 18px;background:linear-gradient(180deg,#0c111fe6,#081423e6);border:1px solid rgba(56,189,248,.25);border-radius:12px;padding:16px;box-shadow:0 10px 26px #082f4973,inset 0 0 0 1px #ffffff0a;max-width:var(--piano-max-width);margin:0 auto;display:grid;gap:12px}.piano-challenge.fullscreen{max-width:none;width:min(var(--piano-max-width),96vw);background:linear-gradient(180deg,#0f172aeb,#081423eb);box-shadow:0 18px 36px #00000073,inset 0 0 0 1px #94a3b840}.piano-header{width:100%}.piano-progress{min-width:220px}.note-track{width:min(var(--piano-max-width),100%);background:radial-gradient(circle at 20% 20%,rgba(56,189,248,.08),transparent),radial-gradient(circle at 80% 10%,rgba(14,165,233,.1),transparent),#0f172ad9;border:1px solid rgba(56,189,248,.25);border-radius:12px;padding:12px var(--piano-horizontal-pad);position:relative;overflow:hidden;height:clamp(260px,40vh,360px);margin:0 auto}.note-lanes{position:relative;width:100%;height:100%}.lane{position:absolute;bottom:0;width:calc(100% / var(--lane-count));height:100%;pointer-events:none;display:flex;justify-content:center}.lane-label{position:absolute;bottom:10px;font-size:11px;color:#c7d2fe;background:#082f49b3;padding:4px 6px;border-radius:8px;border:1px solid rgba(59,130,246,.4);box-shadow:0 0 10px #3b82f673}.hit-line{position:absolute;bottom:22%;left:0;right:0;height:4px;background:linear-gradient(90deg,#7dd3fc59,#0ea5e9cc,#7dd3fc59);box-shadow:0 0 20px #38bdf8b3}.tile{position:absolute;height:56px;border-radius:10px;background:linear-gradient(135deg,#22d3ee,#38bdf8);box-shadow:0 12px 22px #0ea5e980;display:grid;place-items:center;color:#0b1120;font-weight:800;letter-spacing:.05em;top:var(--tile-y);will-change:top,opacity}.falling-note{top:0;transition:top 60ms linear,opacity .12s ease;border:1px solid rgba(14,165,233,.5)}.tile-hit{background:linear-gradient(135deg,#34d399,#22c55e);box-shadow:0 12px 28px #22c55e8c}.tile-miss{background:linear-gradient(135deg,#f43f5e,#e11d48);box-shadow:0 12px 28px #f43f5e66;filter:saturate(1.1)}.piano-keyboard{position:relative;width:min(var(--piano-max-width),100%);background:linear-gradient(180deg,#0f172ae6,#0f172ab3);border-radius:12px;border:1px solid rgba(148,163,184,.4);padding:16px var(--piano-horizontal-pad) 14px;box-shadow:inset 0 -6px 18px #0003,0 10px 24px #00000059;margin:0 auto}.white-keys{display:grid;grid-template-columns:repeat(var(--white-count),minmax(0,1fr));position:relative;gap:0px;background:linear-gradient(180deg,#f8fafc,#e2e8f0);border-radius:10px;padding:8px;box-shadow:inset 0 -4px 10px #0000002e}.white-key{position:relative;height:clamp(150px,26vh,220px);border-radius:8px;background:linear-gradient(180deg,#f8fafc,#e2e8f0);border:1px solid rgba(51,65,85,.4);box-shadow:inset 0 -6px 8px #00000014;transition:transform 90ms ease,box-shadow 90ms ease}.white-key:hover{transform:translateY(-2px)}.white-key.pressed{transform:translateY(2px) scale(.99);box-shadow:inset 0 6px 14px #3b82f666;background:linear-gradient(180deg,#e0f2fe,#bfdbfe);border-color:#3b82f699}.key-label{position:absolute;bottom:8px;left:50%;transform:translate(-50%);font-size:12px;color:#0f172a;font-weight:700;background:#94a3b859;padding:3px 6px;border-radius:8px;border:1px solid rgba(51,65,85,.45)}.black-keys{position:absolute;top:8px;left:var(--piano-horizontal-pad);right:var(--piano-horizontal-pad);height:58%;pointer-events:none;z-index:2}.black-key{position:absolute;width:calc((100% / var(--white-count)) * .6);height:100%;background:linear-gradient(180deg,#111827,#0b1224);border-radius:6px;border:1px solid rgba(248,250,252,.12);box-shadow:inset 0 -6px 10px #0000004d,0 8px 16px #00000040;pointer-events:auto;transition:transform 90ms ease,box-shadow 90ms ease;left:var(--black-key-left)}.black-key.pressed{transform:translateY(2px) scale(.97);box-shadow:inset 0 6px 12px #3b82f666}.piano-feedback{background:#082f49a6;border:1px solid rgba(56,189,248,.35);border-radius:10px;padding:10px 12px;color:#e0f2fe;font-size:13px;box-shadow:inset 0 0 12px #38bdf82e;max-width:var(--piano-max-width);margin:0 auto}.quiz-card{background:var(--quest-surface);border:1px solid var(--quest-border-strong);border-radius:var(--quest-radius);padding:18px;color:var(--quest-text);box-shadow:inset 0 1px #ffffff0a}.quiz-prompt{font-family:var(--quest-display);font-size:1.125rem;font-weight:500;margin:0 0 14px;line-height:1.4}.quiz-progress{height:6px;background:#235d9933;border-radius:999px;margin-bottom:16px;overflow:hidden}.quiz-progress-fill{height:100%;background:linear-gradient(90deg,var(--quest-accent),#5ba8e8);border-radius:999px;transition:width .35s ease}.quiz-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px}.quiz-feedback{font-size:.8125rem;color:#fbbf24;margin:12px 0 0;font-style:italic}.quiz-meta{font-family:var(--quest-mono);font-size:.6875rem;color:var(--quest-muted);margin:14px 0 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