:root {
  --bg: #f6f5fb;
  --card: #ffffff;
  --text: #1c1b29;
  --muted: #61607a;
  --border: #e3e1ef;
  --accent: #5b4ce0;
  --accent-text: #ffffff;
  --accent-soft: #ece9ff;
  --danger: #b4233c;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121119;
    --card: #1c1b27;
    --text: #ecebf5;
    --muted: #a3a1b8;
    --border: #2e2c3d;
    --accent: #8f83ff;
    --accent-text: #121119;
    --accent-soft: #2a2647;
    --danger: #ff7a90;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121119; --card: #1c1b27; --text: #ecebf5; --muted: #a3a1b8; --border: #2e2c3d;
  --accent: #8f83ff; --accent-text: #121119; --accent-soft: #2a2647; --danger: #ff7a90;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 48px; }
header h1 { margin: 0 0 6px; font-size: clamp(1.8rem, 5vw, 2.4rem); letter-spacing: -0.02em; }
.lede { margin: 0 0 24px; color: var(--muted); }
a { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}
.card h2 { margin: 0 0 14px; font-size: 1.1rem; display: flex; align-items: center; gap: 10px; }
.step {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent); font-size: 0.85rem;
}

.drop {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 28px 16px; text-align: center; cursor: pointer;
  border: 2px dashed var(--border); border-radius: var(--radius);
  transition: border-color 0.15s, background 0.15s;
}
.drop:hover, .drop:focus-visible, .drop.over { border-color: var(--accent); background: var(--accent-soft); outline: none; }
.drop input { display: none; }
.drop-icon { font-size: 2rem; color: var(--accent); }
.drop-sub, .note, .took, .hint { color: var(--muted); font-size: 0.875rem; }
.note { margin: 12px 0 0; }
.hint { background: var(--accent-soft); padding: 10px 14px; border-radius: 10px; }

.modes { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; margin-bottom: 16px; }
.mode { position: relative; cursor: pointer; }
.mode input { position: absolute; opacity: 0; }
.mode span {
  display: flex; flex-direction: column; height: 100%;
  padding: 12px 14px; border: 1.5px solid var(--border); border-radius: 12px;
}
.mode small { color: var(--muted); }
.mode input:checked + span { border-color: var(--accent); background: var(--accent-soft); }
.mode input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

button {
  font: inherit; cursor: pointer; border-radius: 10px; padding: 12px 20px; border: 0;
}
button:disabled { opacity: 0.5; cursor: not-allowed; }
.primary { width: 100%; background: var(--accent); color: var(--accent-text); font-weight: 600; }
.secondary { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.progress { margin-top: 16px; }
.bar { height: 8px; border-radius: 4px; background: var(--accent-soft); overflow: hidden; }
#bar-fill { height: 100%; width: 0; background: var(--accent); transition: width 0.3s; }
#status { margin: 8px 0 0; color: var(--muted); font-size: 0.9rem; }
.error { color: var(--danger); margin: 12px 0 0; }

.info { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.stat { background: var(--accent-soft); border-radius: 12px; padding: 12px; display: flex; flex-direction: column; }
.stat .label { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; }
.stat .value { font-size: 1.5rem; font-weight: 700; }
.stat .unit { color: var(--muted); font-size: 0.8rem; }
.mixes { color: var(--muted); font-size: 0.9rem; margin: 10px 0 6px; }
.chip { display: inline-block; padding: 1px 8px; margin: 0 2px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.mixer-help { margin: 14px 0 0; }
.transport { display: flex; align-items: center; gap: 12px; margin: 16px 0 10px; }
.transport .play {
  width: 48px; height: 48px; padding: 0; border-radius: 50%;
  background: var(--accent); color: var(--accent-text); font-size: 1.1rem;
}
.clock { font-variant-numeric: tabular-nums; color: var(--muted); }
.transport .reset { margin-left: auto; background: none; color: var(--muted); padding: 6px 10px; font-size: 0.875rem; }
.transport .reset:hover { color: var(--accent); }

.tracks { list-style: none; margin: 0 0 14px; padding: 0; display: grid; gap: 8px; }
.track {
  display: grid; grid-template-columns: 110px auto 1fr 90px auto; align-items: center; gap: 10px;
  padding: 8px 10px; border: 1px solid var(--border); border-radius: 12px;
  transition: opacity 0.15s;
}
.track.silent .wave, .track.silent .track-name { opacity: 0.35; }
.track-name { font-weight: 600; text-transform: capitalize; display: flex; align-items: center; gap: 8px; min-width: 0; }
.dot { width: 10px; height: 10px; border-radius: 50%; flex: none; background: var(--stem); }
.track-buttons { display: flex; gap: 4px; }
.track-buttons button {
  width: 32px; height: 32px; padding: 0; font-weight: 700; font-size: 0.85rem;
  background: var(--accent-soft); color: var(--muted); border-radius: 8px;
}
.track-buttons .mute[aria-pressed="true"] { background: #d9534f; color: #fff; }
.track-buttons .solo[aria-pressed="true"] { background: #e3b52b; color: #1c1b29; }
.wave { position: relative; height: 44px; cursor: pointer; min-width: 0; touch-action: none; }
.wave:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.wave canvas { width: 100%; height: 100%; display: block; color: var(--stem); }
.playhead { position: absolute; top: 0; bottom: 0; left: 0; width: 2px; background: var(--text); pointer-events: none; }
.volume { width: 100%; accent-color: var(--stem); }
.track a.download {
  text-decoration: none; font-size: 0.85rem; font-weight: 600; padding: 6px 10px;
  border-radius: 8px; background: var(--accent-soft);
}
.actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

footer { color: var(--muted); font-size: 0.8rem; margin-top: 24px; text-align: center; }

@media (max-width: 520px) {
  .track { grid-template-columns: 1fr auto auto; row-gap: 6px; }
  .track .wave { grid-column: 1 / -1; grid-row: 2; }
  .track .volume { grid-column: 1 / 3; grid-row: 3; }
  .track a.download { grid-row: 3; }
  .info { grid-template-columns: 1fr 1fr 1fr; }
  .stat .value { font-size: 1.2rem; }
}

/* Options under the mode picker */
.options { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: center; margin: -4px 0 16px; font-size: 0.92rem; }
.options select, .master select, .loop select {
  font: inherit; font-size: 0.9rem; padding: 4px 8px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--card); color: var(--text); margin-left: 6px;
}
.check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
.check small { color: var(--muted); }
.disabled { opacity: 0.45; }

/* Transport extras */
.loop { font-size: 0.9rem; color: var(--muted); }
.tempo { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin: 0 0 12px; font-size: 0.9rem; }
.tempo-control { display: flex; align-items: center; gap: 8px; color: var(--muted); }
.tempo-control input { width: 160px; accent-color: var(--accent); }
.tempo-readout { font-variant-numeric: tabular-nums; font-weight: 600; min-width: 120px; }
.key-readout { color: var(--muted); }

/* Waveform grid and loop */
.wave canvas { --grid-bar: rgba(128, 128, 160, 0.45); --grid-beat: rgba(128, 128, 160, 0.16); }
.loop-region { position: absolute; top: 0; bottom: 0; background: var(--accent); opacity: 0.16; pointer-events: none; border-radius: 3px; }

/* Per stem FX */
.track-buttons .fx-toggle { width: 36px; }
.track-buttons .fx-toggle.active { background: var(--accent); color: var(--accent-text); }
.track-buttons .fx-toggle[aria-expanded="true"] { outline: 2px solid var(--accent); }
.fx-panel {
  grid-column: 1 / -1; display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 6px 16px; padding: 8px 4px 2px; border-top: 1px dashed var(--border);
}
.fx-control { display: grid; grid-template-columns: 52px 1fr 52px; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--muted); }
.fx-control input { width: 100%; accent-color: var(--stem, var(--accent)); }
.fx-control output { font-variant-numeric: tabular-nums; text-align: right; color: var(--text); }

/* Master section */
.master { border-top: 1px solid var(--border); margin-top: 6px; padding-top: 14px; }
.master-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px; }
.master h3 { margin: 0; font-size: 1rem; }
.master-head .check { font-size: 0.88rem; color: var(--muted); }
.meter { margin: 12px 0; }
.meter-bar { position: relative; height: 10px; border-radius: 5px; background: var(--accent-soft); overflow: hidden; }
.meter-fill { height: 100%; width: 0; background: linear-gradient(90deg, #3cb48a, #e3b52b 75%, #d9534f); transition: width 0.1s; }
.meter-target { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--text); }
.meter-values { display: flex; flex-wrap: wrap; gap: 4px 16px; margin-top: 6px; font-size: 0.85rem; color: var(--muted); align-items: center; }
.meter-values b { color: var(--text); font-variant-numeric: tabular-nums; }
.meter-reset { margin-left: auto; padding: 4px 10px; font-size: 0.8rem; background: var(--accent-soft); color: var(--accent); }
.master-controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 10px 18px; align-items: center; font-size: 0.9rem; }
.master-controls .fx-control { grid-template-columns: 90px 1fr 50px; }
.export-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 14px; }
.primary-outline { background: var(--accent); color: var(--accent-text); font-weight: 600; }
.export-status { font-size: 0.9rem; color: var(--muted); }
.fx-panel[hidden], .loop-region[hidden], .meter-target[hidden] { display: none; }
.fx-panel { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.master-controls > label:not(.fx-control) { display: flex; flex-direction: column; gap: 4px; color: var(--muted); }
.master-controls > label:not(.fx-control) select { margin-left: 0; }
.track-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 520px) {
  .track { grid-template-columns: minmax(0, 1fr) auto; }
  .track .track-buttons { grid-column: 2; grid-row: 1; }
  .track .wave { grid-column: 1 / -1; grid-row: 2; }
  .track .volume { grid-column: 1; grid-row: 3; }
  .track a.download { grid-column: 2; grid-row: 3; }
  .transport { flex-wrap: wrap; }
}