.key{position:relative;display:flex;align-items:flex-end;justify-content:center;cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:none;transition:background-color .05s ease}.white-key{background:linear-gradient(to bottom,#fff,#f0f0f0);border:1px solid #ccc;border-radius:0;width:calc(100% / 15);height:100%;z-index:1}.white-key:active,.white-key.pressed{background:linear-gradient(to bottom,#e0e0e0,#d0d0d0)}.black-key{position:absolute;background:linear-gradient(to bottom,#333,#111);border-radius:0 0 6px 6px;width:4%;height:80%;z-index:2;margin-left:-2%}.black-key:active,.black-key.pressed{background:linear-gradient(to bottom,#555,#333)}.key-label{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:clamp(10px,2.2vw,18px);font-weight:600;padding-bottom:8px;pointer-events:none}.white-key .key-label{color:#666}.black-key .key-label{color:#ccc;font-size:clamp(9px,1.8vw,14px)}@keyframes fall{0%{transform:translate(-50%);opacity:1}to{transform:translate(-50%,var(--delta-y));opacity:1}}@keyframes bounce{0%{transform:translate(-50%,var(--delta-y))}50%{transform:translate(-50%,calc(var(--delta-y) - var(--bounce-distance)))}to{transform:translate(-50%,var(--delta-y))}}@keyframes note-exit{0%{transform:translate(-50%,var(--delta-y));opacity:1}to{transform:translate(-50%,var(--exit-distance));opacity:0}}@keyframes zone-pulse{0%{transform:scale(1);opacity:.85}50%{transform:scale(1.08);opacity:1}to{transform:scale(1);opacity:.6}}.falling-notes-overlay{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:50;overflow:hidden}.falling-note{position:absolute;transform:translate(-50%);background:linear-gradient(180deg,#ffefc2,#ffcf5c);box-shadow:0 10px 30px #ff960047,0 2px 6px #00000040;display:flex;align-items:center;justify-content:center;font-weight:700;color:#111;pointer-events:none;will-change:transform,opacity}.falling-note--circle{border-radius:50%}.falling-note--rect{border-radius:12px}.falling-note--falling{animation:fall var(--fall-ms) linear forwards}.falling-note--bouncing{animation:bounce .22s cubic-bezier(.2,.8,.3,1) forwards}.falling-note--exiting{animation:note-exit .4s cubic-bezier(.2,0,.8,1) forwards}.landing-zone{position:absolute;display:flex;align-items:center;justify-content:center;background:#03a9f440;border:2px solid rgba(3,169,244,.8);border-radius:8px;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);box-shadow:0 0 12px #03a9f466,0 6px 18px #00000029,inset 0 0 8px #03a9f433;pointer-events:none}.landing-zone--pulse{animation:zone-pulse .3s ease-out forwards}@keyframes accuracy-perfect{0%{transform:translate(-50%,-50%) scale(.8);opacity:1}50%{opacity:1}to{transform:translate(-50%,-50%) scale(2.2);opacity:0}}@keyframes accuracy-good{0%{transform:translate(-50%,-50%) scale(.8);opacity:1}50%{opacity:1}to{transform:translate(-50%,-50%) scale(1.8);opacity:0}}@keyframes accuracy-miss{0%{transform:translate(-50%,-50%) scale(.8);opacity:1}50%{opacity:1}to{transform:translate(-50%,-50%) scale(1.4);opacity:0}}.accuracy-feedback{position:absolute;display:flex;align-items:center;justify-content:center;border-radius:50%;font-weight:900;font-size:12px;pointer-events:none;will-change:transform,opacity;top:50%;left:50%;min-width:60px;min-height:60px;z-index:100}.accuracy-feedback--perfect{background:#4caf50e6;box-shadow:0 0 12px #4caf50,0 0 24px #4caf50cc,0 0 40px #4caf5080,inset 0 0 20px #ffffff4d;animation:accuracy-perfect .7s cubic-bezier(.2,0,.8,1) forwards}.accuracy-feedback--good{background:#ffc107e6;box-shadow:0 0 12px #ffc107,0 0 24px #ffc107cc,0 0 40px #ffc10780,inset 0 0 20px #ffffff4d;animation:accuracy-good .7s cubic-bezier(.2,0,.8,1) forwards}.accuracy-feedback--miss{background:#f44336e6;box-shadow:0 0 12px #f44336,0 0 24px #f44336cc,0 0 40px #f4433680,inset 0 0 20px #ffffff4d;animation:accuracy-miss .7s cubic-bezier(.2,0,.8,1) forwards}.accuracy-text{color:#fff;text-shadow:0 2px 4px rgba(0,0,0,.6),0 0 10px rgba(0,0,0,.5);letter-spacing:.5px;white-space:nowrap}.recording-controls{position:fixed;top:20px;left:50%;transform:translate(-50%);display:flex;align-items:center;gap:12px;padding:8px 16px;background:#000000b3;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-radius:30px;z-index:100;box-shadow:0 4px 20px #0000004d}.control-btn{width:44px;height:44px;border:none;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s 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solid #007aff}@keyframes pulse{0%,to{box-shadow:0 0 #ff3b3066}50%{box-shadow:0 0 0 8px #ff3b3000}}@keyframes blink{0%,to{opacity:1}50%{opacity:.5}}.track-list{position:fixed;top:96px;left:50%;transform:translate(-50%);background:#000c;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-radius:12px;padding:12px;z-index:99;min-width:250px;max-width:90vw;max-height:40vh;overflow-y:auto;box-shadow:0 4px 20px #0000004d}.track-list-header{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:11px;font-weight:600;color:#888;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px;padding-bottom:8px;border-bottom:1px solid rgba(255,255,255,.1)}.track-list-items{display:flex;flex-direction:column;gap:6px}.track-item{display:flex;align-items:center;gap:10px;padding:8px 10px;background:#ffffff0d;border-radius:8px;transition:background .15s 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rotate(-45deg)}.track-list::-webkit-scrollbar{width:6px}.track-list::-webkit-scrollbar-track{background:transparent}.track-list::-webkit-scrollbar-thumb{background:#fff3;border-radius:3px}.track-list::-webkit-scrollbar-thumb:hover{background:#ffffff4d}.piano-container{width:100%;height:calc(100dvh - 55px);display:flex;align-items:stretch;justify-content:center;padding:0;box-sizing:border-box;touch-action:none;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}.piano{position:relative;display:flex;width:100%;height:100%;background:linear-gradient(to bottom,#2a2a2a,#1a1a1a);border-radius:0;padding:0;box-shadow:none}.black-key-container{position:absolute;top:0;width:calc(100% / 15 * .65);height:80%;z-index:10}.black-key-container .key{width:100%;height:100%;margin:0}.piano>.key.white-key{flex:1;min-width:0}.rotate-overlay{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#000c;z-index:9999;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.rotate-card{text-align:center;color:#fff;padding:22px 28px;border-radius:12px;max-width:320px}.rotate-icon{width:48px;height:48px;margin-bottom:12px;color:#ffd166}.rotate-text{font-size:18px;font-weight:600}.practice-panel{padding:12px;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);color:#fff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;z-index:100;bottom:0;position:fixed;width:100%;height:55px;display:flex;align-items:center;justify-content:center}.practice-header{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.practice-header strong{font-size:16px}.practice-controls button{padding:0 20px;height:32px;line-height:32px;font-size:14px;color:#fff;border-radius:8px;border:none;background:#ffd166;cursor:pointer}.practice-controls button:active{transform:translateY(1px)}.practice-song-select{height:32px;border:0;padding:0 24px 0 16px;width:300px;margin-left:8px;color:#000;border-radius:6px}.practice-difficulty-select{height:32px;border:0;padding:0 16px;color:#000;border-radius:6px}*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100vh;overflow:hidden;touch-action:none;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}html{overscroll-behavior:none}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);-webkit-tap-highlight-color:transparent}#root{width:100%;height:100%}.app{width:100%;height:100%;display:flex;flex-direction:column;align-items:stretch;justify-content:stretch}@media(orientation:landscape){.app{padding:0}}@media(orientation:portrait){.app{padding:0}.piano-container{transform:rotate(0)}}:root{--safe-top: env(safe-area-inset-top);--safe-bottom: env(safe-area-inset-bottom);--safe-left: env(safe-area-inset-left);--safe-right: env(safe-area-inset-right)}#root,.app{box-sizing:border-box;height:100vh}.start-screen{flex:1;display:flex;align-items:center;justify-content:center;padding:20px}.start-content{text-align:center}.start-title{color:#fff;margin-bottom:12px}.start-button{padding:12px 20px;font-size:18px;border-radius:8px;border:none;background:#ffd166;cursor:pointer;color:#fff}.start-button:active{transform:translateY(1px)}