*{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0c0e16;--card-bg: rgba(255, 255, 255, .06);--card-border: rgba(255, 255, 255, .12);--text: #e7eaf3;--text-dim: #8b91a7;--accent: #6ea8ff;--accent-2: #b08cff}html,body{height:100%}body{background:var(--bg);color:var(--text);font-family:Segoe UI,system-ui,-apple-system,sans-serif;overflow-x:hidden}#app{position:relative;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:28px;padding:32px 16px}.glow{position:fixed;border-radius:50%;filter:blur(120px);opacity:.35;pointer-events:none;z-index:0}.glow-1{width:480px;height:480px;background:#3b5bdb;top:-120px;left:-100px}.glow-2{width:420px;height:420px;background:#7048e8;bottom:-140px;right:-80px}.title{position:relative;z-index:1;font-size:clamp(1.5rem,4vw,2.4rem);font-weight:700;letter-spacing:.02em;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent;text-align:center}.piano-card{position:relative;z-index:1;background:var(--card-bg);border:1px solid var(--card-border);border-radius:20px;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);box-shadow:0 24px 60px #00000080,inset 0 1px #ffffff14;padding:20px 24px 24px;max-width:calc(100vw - 24px);display:flex;flex-direction:column;gap:16px}.audio-hint{text-align:center;font-size:.85rem;color:var(--accent);background:#6ea8ff1a;border:1px solid rgba(110,168,255,.25);border-radius:10px;padding:8px 12px;transition:opacity .4s,transform .4s}.audio-hint.hidden{opacity:0;transform:translateY(-6px);pointer-events:none;height:0;padding:0;border:none;overflow:hidden}.now-playing{display:flex;align-items:center;gap:10px;min-height:28px;font-size:.9rem}.now-playing-label{color:var(--text-dim)}.now-playing-notes{font-family:Cascadia Code,Consolas,monospace;color:var(--text-dim);transition:color .15s}.now-playing.has-notes .now-playing-notes{color:var(--accent);text-shadow:0 0 12px rgba(110,168,255,.6);animation:note-bounce .25s ease}@keyframes note-bounce{0%{transform:translateY(2px)}50%{transform:translateY(-2px)}to{transform:translateY(0)}}.keyboard-scroll{overflow-x:auto;padding-bottom:6px;touch-action:pan-x}.piano-keyboard{--white-key-width: 56px;--black-key-width: 36px;position:relative;display:flex;width:max-content;margin:0 auto;touch-action:none;user-select:none;-webkit-user-select:none}.piano-key{display:flex;flex-direction:column;justify-content:flex-end;align-items:center;cursor:pointer;transition:transform .06s ease,background .1s ease,box-shadow .1s ease}.piano-key.white{width:var(--white-key-width);height:220px;background:linear-gradient(180deg,#f6f7fa,#e9ebf2 85%,#d8dbe6);border:1px solid #c2c6d4;border-radius:0 0 8px 8px;padding-bottom:10px;gap:4px;box-shadow:0 6px 10px #00000059}.piano-key.white:hover{box-shadow:0 8px 16px #00000073}.piano-key.white.active{transform:translateY(4px) scale(.99);background:linear-gradient(180deg,#cfe1ff,#a9c8ff);border-color:var(--accent);box-shadow:0 2px 4px #0000004d,0 0 18px #6ea8ff8c}.piano-key.white .key-note{font-size:.72rem;color:#5a6075;font-weight:600}.piano-key.white .key-kb{font-size:.68rem;color:#fff;background:#6a7188;border-radius:4px;min-width:18px;text-align:center;padding:1px 4px;font-family:Consolas,monospace}.piano-key.black{position:absolute;top:0;width:var(--black-key-width);height:135px;background:linear-gradient(180deg,#2a2d3a,#14161f 70%,#090a10);border:1px solid #000;border-radius:0 0 6px 6px;padding-bottom:8px;z-index:2;box-shadow:0 5px 8px #0009}.piano-key.black:hover{box-shadow:0 7px 12px #000000b3}.piano-key.black.active{transform:translateY(3px) scale(.98);background:linear-gradient(180deg,#4a5170,#2c3148);box-shadow:0 2px 4px #00000080,0 0 16px #b08cff80}.piano-key.black .key-note{display:none}.piano-key.black .key-kb{font-size:.65rem;color:#aab0c5;font-family:Consolas,monospace}.controls{display:flex;flex-wrap:wrap;align-items:center;gap:14px 22px;padding-top:4px}.control-group{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.control-label{font-size:.85rem;color:var(--text-dim)}.volume-slider{width:120px;accent-color:var(--accent)}.octave-label{font-size:.85rem;min-width:78px;text-align:center;font-family:Consolas,monospace;color:var(--accent)}.sustain-toggle{display:flex;align-items:center;gap:6px;font-size:.85rem;cursor:pointer;color:var(--text-dim)}.sustain-toggle input{accent-color:var(--accent);width:16px;height:16px;cursor:pointer}.btn{background:#ffffff14;border:1px solid rgba(255,255,255,.15);color:var(--text);border-radius:8px;padding:7px 14px;font-size:.82rem;cursor:pointer;transition:background .15s,transform .08s,box-shadow .15s}.btn:hover:not(:disabled){background:#ffffff26;box-shadow:0 4px 12px #0000004d}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.35;cursor:not-allowed}.btn-record.recording{background:#ff525240;border-color:#ff525299;color:#ff8080;animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 #ff525266}50%{box-shadow:0 0 0 6px #ff525200}}.record-info{font-size:.8rem;color:var(--text-dim)}.mapping-hint{position:relative;z-index:1;text-align:center;font-size:.82rem;line-height:1.8;color:var(--text-dim);font-family:Consolas,monospace}@media(max-width:720px){#app{gap:18px;padding:20px 8px}.piano-card{padding:14px 12px 16px}.piano-keyboard{--white-key-width: 48px;--black-key-width: 30px}.piano-key.white{height:180px}.piano-key.black{height:110px}}