:root{--bg: #f3f4f6;--surface: #ffffff;--ink: #1b1f27;--ink-soft: #6b7280;--line: #e2e4e9;--accent: #4f7cff;--accent-ink: #2f4fc7;--radius: 10px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Malgun Gothic,Apple SD Gothic Neo,sans-serif}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);line-height:1.5}#app{max-width:720px;margin:0 auto;padding:2.5rem 1.25rem 4rem}@media (max-width: 480px){#app{padding:1.5rem .9rem 3rem}}.app-header h1{font-size:1.6rem;margin:0 0 .4rem}.subtitle{color:var(--ink-soft);margin:0 0 2rem;max-width:56ch}.drop-zone{border:2px dashed var(--line);border-radius:var(--radius);background:var(--surface);padding:3rem 1.5rem;text-align:center;transition:border-color .15s ease,background .15s ease}.drop-zone.drag-over{border-color:var(--accent);background:#eef2ff}.drop-zone-text{margin:0 0 1rem;font-size:1.05rem}.drop-zone-hint{margin:1rem 0 0;font-size:.85rem;color:var(--ink-soft)}.file-button{display:inline-block;background:var(--accent);color:#fff;padding:.75rem 1.6rem;border-radius:999px;font-weight:600;cursor:pointer;touch-action:manipulation;-webkit-user-select:none;user-select:none}.file-button:hover,.file-button:active{background:var(--accent-ink)}@media (max-width: 480px){.drop-zone{padding:2.25rem 1.1rem}.app-header h1{font-size:1.35rem}.subtitle{font-size:.92rem}}.player{background:var(--surface);border-radius:var(--radius);border:1px solid var(--line);padding:1.5rem}@media (max-width: 480px){.player{padding:1.1rem}}.song-info{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:1.2rem;gap:1rem;flex-wrap:wrap}.song-info-actions{display:flex;gap:1rem;flex:none}@media (max-width: 480px){.song-info{flex-direction:column;align-items:flex-start;gap:.4rem}}.share-panel{display:flex;gap:.5rem;margin-bottom:1.2rem}.share-panel[hidden]{display:none}.share-link-input{flex:1;min-width:0;font:inherit;font-size:.85rem;padding:.5rem .7rem;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink)}.share-copy-btn{flex:none;padding:.5rem 1rem;font-size:.85rem}#song-name{font-weight:700;font-size:1.05rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.link-button{background:none;border:none;color:var(--accent);cursor:pointer;font-size:.85rem;padding:.5rem 0;margin:-.5rem 0;white-space:nowrap;touch-action:manipulation}.link-button:hover{text-decoration:underline}.transport-bar{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.transport-button{width:2.75rem;height:2.75rem;border-radius:50%;border:1px solid var(--line);background:var(--surface);font-size:1.1rem;cursor:pointer;flex:none;display:flex;align-items:center;justify-content:center;touch-action:manipulation;-webkit-user-select:none;user-select:none}.transport-button:hover{border-color:var(--accent)}.transport-button:active{background:var(--bg)}.transport-button.toggle.active{background:var(--accent);border-color:var(--accent)}.progress-wrap{flex:1 1 220px;min-width:180px}.progress-track{position:relative;height:30px;display:flex;align-items:center;cursor:pointer;touch-action:none}.progress-track:before{content:"";position:absolute;left:0;right:0;top:50%;height:10px;transform:translateY(-50%);border-radius:999px;background:#e9eaef}.progress-fill{position:absolute;top:50%;left:0;width:0%;height:10px;transform:translateY(-50%);background:var(--accent);border-radius:999px;pointer-events:none}.loop-region{position:absolute;top:50%;height:16px;transform:translateY(-50%);background:#e0a53e59;border:1px solid #e0a53e;border-radius:999px;pointer-events:none}.progress-handle{position:absolute;top:50%;left:0%;width:18px;height:18px;background:var(--accent);border:2px solid white;border-radius:50%;transform:translate(-50%,-50%);box-shadow:0 0 0 1px var(--line);pointer-events:none}.time-labels{display:flex;justify-content:space-between;font-size:.78rem;color:var(--ink-soft);margin-top:.35rem;font-variant-numeric:tabular-nums}.tempo-control{display:flex;align-items:center;gap:.5rem;font-size:.85rem;color:var(--ink-soft)}.tempo-control input[type=range]{width:100px}@media (max-width: 480px){.tempo-control{flex:1 1 100%}.tempo-control input[type=range]{flex:1;width:auto}}#tempo-value{font-variant-numeric:tabular-nums;width:3.2em}.loop-hint{font-size:.78rem;color:var(--accent-ink);margin:.5rem 0 0}.loop-hint[hidden]{display:none}.track-list{margin-top:1.6rem;display:flex;flex-direction:column;gap:.6rem}.track-row{display:grid;grid-template-columns:10px 1fr auto auto 90px;align-items:center;gap:.6rem;padding:.6rem .7rem;border:1px solid var(--line);border-radius:8px}.track-color{width:10px;height:10px;border-radius:50%;flex:none}.track-name{overflow:hidden;min-width:0}.track-name-btn{display:flex;align-items:center;gap:.35rem;width:100%;min-height:2.75rem;background:none;border:none;padding:.3rem 0;margin:0;font:inherit;font-weight:600;color:inherit;text-align:left;cursor:pointer;touch-action:manipulation}.track-name-btn:active{opacity:.7}.track-name-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.edit-icon{opacity:.4;font-size:.8em;flex:none}.track-name-btn:hover .edit-icon,.track-name-btn:focus-visible .edit-icon{opacity:.9}.track-name-input{width:100%;font:inherit;font-weight:600;padding:.3rem .4rem;border:1px solid var(--accent);border-radius:6px;background:var(--surface);color:var(--ink)}.track-name-input:focus{outline:2px solid var(--accent);outline-offset:1px}.track-toggle{border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:.3rem .7rem;min-height:2.75rem;min-width:2.75rem;font-size:.78rem;cursor:pointer;color:var(--ink-soft);touch-action:manipulation;-webkit-user-select:none;user-select:none}.track-toggle:active{background:var(--bg)}.track-toggle.mute.active{background:#fde3e3;border-color:#e07a7a;color:#a83a3a}.track-toggle.solo.active{background:#fff3d6;border-color:#e0a53e;color:#8a6212}.track-volume{width:90px}@media (max-width: 480px){.track-row{grid-template-columns:10px 1fr auto auto;grid-template-areas:"dot name mute solo" "vol vol vol vol";row-gap:.55rem}.track-color{grid-area:dot}.track-name{grid-area:name}.track-toggle.mute{grid-area:mute}.track-toggle.solo{grid-area:solo}.track-volume{grid-area:vol;width:100%}}