:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{width:100%;height:100%;overflow:hidden;background:#1a1a2e;color:#fafafa;user-select:none;-webkit-user-select:none;touch-action:none}.piano-game{position:relative;width:100%;height:100vh;overflow:hidden;background:linear-gradient(180deg,#0f0f23,#1a1a2e)}.overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;z-index:100;background:#0a0a1eeb;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.menu-content{text-align:center;animation:fadeIn .4s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.game-title{font-size:3rem;font-weight:800;letter-spacing:-.03em;background:linear-gradient(135deg,#e94560,#0f3460);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.5rem}.subtitle{font-size:1.1rem;color:#fff9;margin-bottom:1.5rem}.final-score{font-size:2rem;font-weight:700;color:#e94560;margin-bottom:.5rem}.new-record{font-size:1.2rem;font-weight:600;color:gold;margin-bottom:.5rem;animation:pulse .6s ease-in-out infinite alternate}@keyframes pulse{0%{transform:scale(1)}to{transform:scale(1.08)}}.high-score{font-size:.95rem;color:#ffffff73;margin-bottom:2rem}.start-btn{font-size:1.2rem;font-weight:700;padding:.85rem 3rem;border:none;border-radius:50px;background:linear-gradient(135deg,#e94560,#c23152);color:#fff;cursor:pointer;transition:transform .15s,box-shadow .15s;box-shadow:0 4px 20px #e9456066}.start-btn:hover{transform:translateY(-2px);box-shadow:0 6px 28px #e945608c}.start-btn:active{transform:translateY(0)}.game-hud{position:absolute;top:1rem;left:0;right:0;display:flex;flex-direction:column;align-items:center;z-index:50;pointer-events:none}.score-display{font-size:2.5rem;font-weight:800;color:#ffffffd9;text-shadow:0 2px 12px rgba(0,0,0,.5)}.combo-display{font-size:1.1rem;font-weight:700;color:gold;text-shadow:0 0 12px rgba(255,215,0,.5);animation:comboPop .3s ease-out}@keyframes comboPop{0%{transform:scale(1.4);opacity:.6}to{transform:scale(1);opacity:1}}.hit-zone{position:absolute;bottom:0;left:0;right:0;height:35%;background:linear-gradient(0deg,rgba(233,69,96,.08) 0%,transparent 100%);pointer-events:none;z-index:5;border-top:2px solid rgba(233,69,96,.25)}.col-divider{position:absolute;top:0;bottom:0;width:1px;background:#ffffff0f;pointer-events:none;z-index:3}.tile{position:absolute;border-radius:6px;background:linear-gradient(180deg,#2d2d4e,#1e1e3a);border:1.5px solid rgba(255,255,255,.12);cursor:pointer;z-index:10;transition:background .1s,transform .08s;display:flex;align-items:center;justify-content:center}.tile:after{content:"";position:absolute;top:4px;right:4px;bottom:4px;left:4px;border-radius:4px;background:linear-gradient(180deg,rgba(255,255,255,.04),transparent);pointer-events:none}.tile:active{transform:scale(.97)}.tile-hit{background:linear-gradient(180deg,#e94560,#c23152)!important;border-color:#e9456099!important;box-shadow:0 0 20px #e9456080;animation:tilePop .25s ease-out;pointer-events:none}@keyframes tilePop{0%{transform:scale(1);opacity:1}50%{transform:scale(1.05)}to{transform:scale(.95);opacity:.4}}.tile-missed{background:linear-gradient(180deg,#f44,#c00)!important;border-color:#f449!important;opacity:.6;pointer-events:none}@media(max-width:500px){.game-title{font-size:2.2rem}.score-display{font-size:2rem}.tile{border-radius:4px}}