:root{--bg:#0e0f13;--panel:#16181f;--panel-2:#1d2029;--line:#2a2e3a;--text:#e7e9ee;--muted:#8b90a0;--accent:#4f9cff;--good:#5fd07a;--bad:#ff6b6b;--warn:#ffcf5c;font-family:system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}[hidden]{display:none!important}html,body{background:var(--bg);height:100%;color:var(--text);margin:0}#app{flex-direction:column;height:100vh;display:flex}#gate{flex-direction:column;flex:1;justify-content:center;align-items:center;gap:1rem;display:flex}#start-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:999px;padding:.9rem 2.4rem;font-size:1.25rem;transition:transform 80ms,filter .15s}#start-btn:hover{filter:brightness(1.1)}#start-btn:active{transform:scale(.97)}#gate-hint{color:var(--muted);font-size:.9rem}#stage{flex-direction:column;flex:1;min-height:0;display:flex}#topbar{background:var(--panel);border-bottom:1px solid var(--line);flex:none;justify-content:space-between;align-items:center;gap:1rem;padding:.6rem 1rem;display:flex}#song-info{font-size:.95rem;font-weight:600}.mic-status{font-variant-numeric:tabular-nums;color:var(--muted);background:var(--panel-2);border:1px solid var(--line);text-align:center;border-radius:999px;min-width:7rem;padding:.2rem .7rem;font-size:.9rem;transition:color .1s,border-color .1s}.mic-status[data-verdict=in-tune]{color:var(--good);border-color:var(--good)}.mic-status[data-verdict=sharp]{color:var(--bad);border-color:var(--bad)}.mic-status[data-verdict=flat]{color:var(--accent);border-color:var(--accent)}#controls{flex-wrap:wrap;align-items:center;gap:.8rem;display:flex}#controls button,#controls select{background:var(--panel-2);color:var(--text);border:1px solid var(--line);cursor:pointer;border-radius:8px;padding:.35rem .7rem;font-size:.85rem}#controls button:hover{border-color:var(--accent)}#controls label{color:var(--muted);align-items:center;gap:.4rem;font-size:.8rem;display:inline-flex}#highway-wrap{background:#0a0b0e;flex:1;min-height:0;position:relative}#highway{width:100%;height:100%;display:block}#pitchline-wrap{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#11131a;flex:none;height:96px;position:relative}#pitchline{width:100%;height:100%;display:block}#score-badge{border:1px solid var(--line);font-variant-numeric:tabular-nums;color:var(--muted);background:#00000080;border-radius:999px;padding:.15rem .8rem;font-size:.85rem;position:absolute;top:6px;right:10px}#score-badge.has-score{color:var(--good);border-color:var(--good)}#lyrics-wrap{background:var(--panel);border-top:1px solid var(--line);flex:none;justify-content:center;align-items:center;min-height:6rem;padding:.5rem 1rem;display:flex;overflow:hidden}#lyrics{text-align:center;width:100%;font-weight:600;line-height:1.5}.lyr-line{text-align:center;transition:opacity .2s,transform .2s,font-size .2s}.lyr-line.far{display:none}.lyr-line.prev,.lyr-line.next{opacity:.4;font-size:1rem}.lyr-line.cur{opacity:1;font-size:1.6rem}.syl{color:var(--muted);margin:0 1px;transition:color .12s}.syl.done{color:var(--text);opacity:.55}.syl.active[data-effect=k]{color:var(--good)}.syl.active[data-effect=kf]{background:linear-gradient(to right, var(--good) 0%, var(--good) calc(var(--progress,0) * 100%), var(--muted) calc(var(--progress,0) * 100%), var(--muted) 100%);-webkit-text-fill-color:transparent;color:#0000;-webkit-background-clip:text;background-clip:text}.syl.active[data-effect=ko]{color:var(--accent)}.syl.active[data-effect=plain]{color:var(--text)}#piano-wrap{background:var(--panel);border-top:1px solid var(--line);flex:none;padding:.5rem}.piano{padding-bottom:4px;position:relative;overflow:auto hidden}.piano-inner{flex-direction:row;height:7vh;min-height:64px;margin:0 auto;display:flex;position:relative}.piano-key{cursor:pointer;font:inherit;-webkit-user-select:none;user-select:none;border:none;flex-direction:column;justify-content:flex-end;align-items:center;padding-bottom:6px;transition:filter 60ms;display:flex}.piano-key.white{color:#333;background:#f4f5f8;border-right:1px solid #c9ccd4;flex:none;height:100%}.piano-key.white:first-child{border-radius:0 0 0 6px}.piano-key.black{color:#c7cbd4;z-index:2;background:#15171d;border-radius:0 0 5px 5px;height:5vh;min-height:44px;position:absolute;top:0}.piano-key.pressed,.piano-key:active{filter:brightness(.82)}.piano-key.melody-hit{box-shadow:0 0 0 2px var(--good), 0 0 14px 2px #5fd07ab3}.piano-key.singing{box-shadow:0 0 0 2px var(--warn), 0 0 14px 2px #ffcf5ccc}.piano-key.melody-hit.singing{box-shadow:0 0 0 2px var(--good), 0 0 14px 2px #5fd07ab3, inset 0 0 0 2px var(--warn)}.piano-key-label{opacity:.55;text-transform:uppercase;font-size:.7rem}.piano-key-name{opacity:.4;font-size:.62rem}