/* Drum Practice Aid — minimal dark UI */
:root {
  --bg: #14171c;
  --panel: #1d2128;
  --border: #2c3038;
  --fg: #e6e8eb;
  --muted: #9aa0a8;
  --accent: #ff8a3d;
  --accent-soft: #ff8a3d33;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); font: 14px/1.45 -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif; }
header { padding: 16px 24px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 24px; }
header h1 { margin: 0; font-size: 18px; font-weight: 600; letter-spacing: 0.2px; }
.song-picker { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.song-picker select { background: var(--panel); color: var(--fg); border: 1px solid var(--border); border-radius: 6px; padding: 6px 10px; font-size: 13px; }

main { padding: 16px 24px 48px; display: grid; gap: 16px; max-width: 1400px; margin: 0 auto; }

section { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 14px 16px; }

#transport { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
#transport #play-pause { background: var(--accent); color: #14171c; border: 0; border-radius: 6px; padding: 8px 14px; font-weight: 600; cursor: pointer; }
#transport #play-pause[disabled] { background: var(--border); color: var(--muted); cursor: not-allowed; }
#time { color: var(--muted); font-variant-numeric: tabular-nums; min-width: 110px; }

.control { display: flex; align-items: center; gap: 10px; }
.control label { color: var(--muted); font-size: 12px; }
.control input[type=range] { width: 180px; accent-color: var(--accent); }
.preset-row { display: inline-flex; gap: 4px; margin-left: 4px; }
.preset { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 4px; padding: 3px 8px; font-size: 11px; cursor: pointer; font-variant-numeric: tabular-nums; }
.preset:hover { color: var(--fg); border-color: var(--accent); }
.preset.active { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
#transport button.toggle { background: transparent; color: var(--muted); border: 1px solid var(--border); padding: 6px 12px; border-radius: 6px; font-size: 12px; cursor: pointer; }
#transport button.toggle[aria-pressed=true] { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.ab-group { display: inline-flex; gap: 4px; align-items: center; }
#transport button.ab { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 6px 12px; font-size: 12px; font-weight: 600; cursor: pointer; min-width: 36px; }
#transport button.ab:hover { color: var(--fg); border-color: var(--accent); }
#transport button.ab.armed { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
#transport button.zoom { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 4px 10px; font-size: 14px; cursor: pointer; min-width: 30px; }
#transport button.zoom:hover { color: var(--accent); border-color: var(--accent); }
/* Grid-tune cluster: correct an off downbeat or a metric-multiple BPM by eye.
   Tinted blue to match the bar-line overlay it controls (not the orange loop accent). */
.grid-group { display: inline-flex; gap: 4px; align-items: center; }
.grid-group .grid-label { color: var(--muted); font-size: 11px; letter-spacing: 0.3px; text-transform: uppercase; margin-right: 2px; }
#transport button.grid-btn { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 6px 10px; font-size: 12px; cursor: pointer; font-variant-numeric: tabular-nums; }
#transport button.grid-btn:hover { color: #9cc4ff; border-color: rgba(120,180,255,0.6); }
#transport button.grid-btn[disabled] { opacity: 0.4; cursor: not-allowed; }
#transport button.grid-btn.active { color: #9cc4ff; border-color: rgba(120,180,255,0.7); background: rgba(120,180,255,0.12); }
.kbd-hint { color: var(--muted); font-size: 11px; margin-left: auto; font-variant-numeric: tabular-nums; }
/* On touch devices keyboard shortcuts are meaningless — hide the hint. */
@media (hover: none), (max-width: 800px) {
  .kbd-hint { display: none; }
}
.stem-header .solo { margin-right: 4px; }
.stem-header button.solo.active { color: #ffd700; border-color: #ffd700; }

#waveform { padding: 8px 10px; min-height: 160px; position: relative; }
/* Bar-line grid overlaid on the waveform. Lines are absolutely positioned by
   time ratio so they track the waveform width/height responsively. pointer-events
   none so they never block drag-to-select. */
#grid-overlay { position: absolute; inset: 8px 10px; pointer-events: none; z-index: 5; }
#grid-overlay .bar { position: absolute; top: 0; bottom: 0; width: 1px; background: rgba(255,255,255,0.14); }
#grid-overlay .bar.downbeat { background: rgba(120,180,255,0.45); width: 1px; }
#grid-overlay .bar .num { position: absolute; top: 0; left: 2px; font-size: 9px; color: rgba(120,180,255,0.7); font-variant-numeric: tabular-nums; }
.bpm { color: var(--accent); font-size: 12px; font-variant-numeric: tabular-nums; }

#stems { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.stem { background: #181c22; border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px; }
.stem-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }
.stem-header strong { font-size: 13px; }
.stem-header button { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 4px; padding: 2px 8px; font-size: 11px; cursor: pointer; }
.stem-header button.muted { color: var(--accent); border-color: var(--accent); }
.stem input[type=range] { width: 100%; accent-color: var(--accent); }

.loops-header { display: flex; align-items: center; gap: 12px; }
.loops-header h2 { margin: 0; font-size: 14px; }
.loops-header button { background: transparent; color: var(--accent); border: 1px solid var(--accent); border-radius: 6px; padding: 5px 10px; font-size: 12px; cursor: pointer; margin-left: auto; }
#loop-list { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 6px; }
#loop-list li { display: grid; grid-template-columns: 1fr auto auto auto; gap: 8px; align-items: center; background: #181c22; border: 1px solid var(--border); border-radius: 6px; padding: 6px 10px; }
#loop-list li.active { border-color: var(--accent); background: var(--accent-soft); }
#loop-list li .name { background: transparent; color: var(--fg); border: 0; font-size: 13px; min-width: 0; }
#loop-list li .range { color: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
#loop-list li button { background: transparent; color: var(--muted); border: 1px solid var(--border); border-radius: 4px; padding: 2px 8px; font-size: 11px; cursor: pointer; }
.hint { color: var(--muted); font-size: 12px; margin: 8px 0 0; }