:root {
  --bg: #fbfaf7;
  --panel: #ffffff;
  --ink: #1d1d1f;
  --muted: #6b6b70;
  --line: #e3e0d8;
  --accent: #1f5fbf;
  --accent-soft: rgba(31, 95, 191, 0.10);
  --mine: #1f5fbf;
  --now: #e0600b;
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--ink); background: var(--bg); }
button, select, input { font: inherit; }
[hidden] { display: none !important; }

.topbar { display: flex; align-items: baseline; gap: 16px; padding: 10px 16px; border-bottom: 1px solid var(--line); background: var(--panel); position: sticky; top: 0; z-index: 20; }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; }
.brand::before { content: "\2190  "; color: var(--muted); }
.song-title { color: var(--muted); }

.list-view { max-width: 760px; margin: 24px auto; padding: 0 16px; }
.list-view h1 { margin: 0 0 4px; }
.hint, .muted { color: var(--muted); }
.song-list { list-style: none; padding: 0; margin: 16px 0; }
.song-list a { display: flex; justify-content: space-between; gap: 12px; padding: 14px 16px; margin-bottom: 8px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; color: var(--ink); text-decoration: none; }
.song-list a:hover { border-color: var(--accent); }
.song-list .part { color: var(--accent); white-space: nowrap; }

.controls { position: sticky; top: 45px; z-index: 15; background: var(--panel); border-bottom: 1px solid var(--line); padding: 8px 16px; }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; margin: 4px 0; }
button { padding: 6px 12px; border: 1px solid var(--line); border-radius: 8px; background: #fff; cursor: pointer; }
button:hover { border-color: var(--accent); }
button.big { min-width: 90px; font-weight: 600; background: var(--accent); color: #fff; border-color: var(--accent); }
button.on { background: var(--accent); color: #fff; border-color: var(--accent); }
button:disabled { opacity: .45; cursor: default; }
.bar-readout b { font-variant-numeric: tabular-nums; }
.tempo input { vertical-align: middle; width: 140px; }
#tempoLabel { display: inline-block; min-width: 3.5em; font-variant-numeric: tabular-nums; }
.part-pick select { font-weight: 600; color: var(--mine); }
.modes { display: flex; flex-wrap: wrap; gap: 6px; }

.mixer { display: flex; flex-wrap: wrap; gap: 6px 10px; margin-top: 6px; }
.track { display: flex; align-items: center; gap: 6px; padding: 4px 8px; border: 1px solid var(--line); border-radius: 8px; }
.track.mine { border-color: var(--mine); background: var(--accent-soft); }
.track .name { min-width: 64px; font-weight: 600; }
.track button { padding: 2px 8px; font-size: 13px; }
.track input[type=range] { width: 80px; }

.score-wrap { position: relative; padding: 8px 8px 60vh; }
#score { width: 100%; }
.overlay { position: absolute; inset: 0; pointer-events: none; }
.cursor { position: absolute; width: 3px; margin-left: -1px; background: var(--now); opacity: .8; border-radius: 2px; transition: left .06s linear; }
.parthl { position: absolute; background: var(--accent-soft); border-radius: 3px; }
#score svg { cursor: pointer; }