/* ===== Loopy — dark theme ===== */
:root {
  --bg: #232327;          /* app background: dark grey */
  --bg-raised: #2b2b30;
  --bg-cell: #313136;
  --bg-cell-beat: #38383e;
  --pad-unassigned: #4a4a52;  /* lighter grey for unassigned pads */
  --line: #3c3c43;
  --text: #e8e8ea;
  --text-dim: #9b9ba3;
  --accent: #ffb224;
  --play: #46a758;
  --danger: #e5484d;
  --radius: 10px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
  touch-action: manipulation;
  padding-bottom: env(safe-area-inset-bottom);
}

/* ===== Top bar ===== */
.topbar {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  padding: 10px 16px;
  background: var(--bg-raised);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand { display: flex; align-items: center; gap: 8px; }
.brand h1 { font-size: 20px; margin: 0; letter-spacing: .5px; font-weight: 600; }

.transport { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.field { display: flex; flex-direction: column; gap: 2px; }
.field label { font-size: 10px; text-transform: uppercase; letter-spacing: .8px; color: var(--text-dim); }
.field input[type="number"], .field select {
  background: var(--bg-cell);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 8px;
  width: 70px;
  font-size: 14px;
}
.field input[type="range"] { width: 100px; accent-color: var(--accent); }

.actions { display: flex; gap: 8px; margin-left: auto; }

/* ===== Buttons ===== */
.btn {
  background: var(--bg-cell);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: background .12s, transform .05s;
  user-select: none;
  -webkit-user-select: none;
}
.btn:hover { background: #3d3d44; }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #1c1608; font-weight: 600; }
.btn.primary:hover { background: #ffc04d; }
.btn.accent { border-color: var(--accent); color: var(--accent); }
.btn.danger { border-color: var(--danger); color: var(--danger); }
.btn.ghost { background: transparent; border-style: dashed; color: var(--text-dim); }
.btn.icon { padding: 4px 10px; font-size: 18px; line-height: 1; }

.btn.play {
  width: 46px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--play); border-color: var(--play); color: #fff;
}
.btn.play:hover { filter: brightness(1.1); }
.btn.play .ic-stop { display: none; }
body.playing .btn.play { background: var(--danger); border-color: var(--danger); }
body.playing .btn.play .ic-play { display: none; }
body.playing .btn.play .ic-stop { display: block; }

/* ===== Grid ===== */
main { padding: 14px 16px 30px; }
.grid {
  overflow-x: auto;
  padding-bottom: 4px;
  border-radius: var(--radius);
}

.track, .ruler {
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin-bottom: 8px;
  width: max-content;
  min-width: 100%;
}

/* pad (instrument button) */
.pad {
  position: sticky;
  left: 0;
  z-index: 5;
  flex: 0 0 128px;
  min-height: 44px;
  border-radius: 9px;
  border: none;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,.35);
  background: var(--pad, var(--pad-unassigned));
  box-shadow: 0 2px 0 rgba(0,0,0,.35), 4px 0 8px -2px var(--bg);
  padding: 4px 10px;
  text-align: left;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  transition: filter .1s, transform .05s;
}
.pad:active, .pad.hit { filter: brightness(1.35); transform: scale(.98); }
.pad.unassigned { color: #cfcfd6; font-weight: 400; font-style: italic; text-shadow: none; }

.tbtns { display: flex; flex-direction: column; gap: 3px; justify-content: center; }
.tbtns button {
  width: 24px; height: 19px;
  font-size: 10px; font-weight: 700;
  border-radius: 5px;
  border: 1px solid var(--line);
  background: var(--bg-cell);
  color: var(--text-dim);
  cursor: pointer;
  padding: 0;
}
.tbtns .mute.on { background: var(--danger); border-color: var(--danger); color: #fff; }
.tbtns .solo.on { background: var(--accent); border-color: var(--accent); color: #1c1608; }

/* step cells */
.cells { display: flex; gap: 4px; flex: 1; }
.cell {
  flex: 0 0 34px;
  min-height: 44px;
  border-radius: 7px;
  border: none;
  background: var(--bg-cell);
  cursor: pointer;
  padding: 0;
  transition: background .08s, box-shadow .08s;
}
.cell:nth-child(8n+5), .cell:nth-child(8n+6), .cell:nth-child(8n+7), .cell:nth-child(8n+8) {
  background: var(--bg-cell-beat);
}
.cell.on { background: var(--tcol, var(--pad-unassigned)); box-shadow: inset 0 0 0 2px rgba(255,255,255,.22), 0 0 10px -2px var(--tcol, transparent); }
.cell.playhead { box-shadow: inset 0 0 0 2px rgba(255,255,255,.5); }
.cell.on.playhead { filter: brightness(1.45); }

/* ruler */
.ruler { margin-bottom: 10px; }
.ruler .pad-spacer {
  position: sticky; left: 0; z-index: 5;
  flex: 0 0 128px;
  background: var(--bg);
}
.ruler .tbtns-spacer { width: 24px; flex: 0 0 24px; }
.ruler .cells { align-items: end; }
.ruler .tick {
  flex: 0 0 34px;
  min-height: 16px;
  text-align: center;
  font-size: 10px;
  color: var(--text-dim);
  border-radius: 4px;
}
.ruler .tick.beat { color: var(--text); font-weight: 700; }
.ruler .tick.playhead { background: var(--accent); color: #1c1608; font-weight: 700; }

.grid-foot { margin-top: 6px; }
.hint { color: var(--text-dim); font-size: 12px; margin: 10px 2px 0; }

/* ===== Overlays / modals ===== */
.overlay {
  position: fixed; inset: 0;
  background: rgba(10, 10, 12, .62);
  backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center;
  z-index: 50;
  padding: 16px;
}
.overlay.hidden, .hidden { display: none; }
.modal {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  width: min(560px, 100%);
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  box-shadow: 0 18px 50px rgba(0,0,0,.5);
}
.modal.narrow { width: min(420px, 100%); }
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.modal-head h2 { margin: 0; font-size: 17px; }
.modal-foot { display: flex; align-items: center; gap: 8px; margin-top: 18px; }
.spacer { flex: 1; }

.stack { display: flex; flex-direction: column; gap: 5px; font-size: 12px; color: var(--text-dim); margin-bottom: 12px; }
.stack input, .stack select {
  background: var(--bg-cell);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 8px 10px;
  font-size: 14px;
}
.section-label { font-size: 11px; text-transform: uppercase; letter-spacing: .8px; color: var(--text-dim); margin: 14px 0 8px; }
.dim { color: var(--text-dim); }
.small { font-size: 11.5px; line-height: 1.5; }

.inst-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: 7px; }
.inst-list button {
  background: var(--bg-cell);
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 6px;
  font-size: 12.5px;
  cursor: pointer;
}
.inst-list button:hover { background: #3d3d44; }
.inst-list button.sel { border-color: var(--accent); background: #453a1d; color: #ffd47f; }

.color-row { display: flex; gap: 8px; flex-wrap: wrap; }
.swatch {
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
}
.swatch.sel { border-color: #fff; box-shadow: 0 0 0 2px rgba(255,255,255,.3); }

.import-row input[type="file"] { color: var(--text-dim); font-size: 12px; max-width: 100%; }

.save-row { display: flex; gap: 8px; margin-bottom: 14px; }
.save-row input { flex: 1; background: var(--bg-cell); color: var(--text); border: 1px solid var(--line); border-radius: 7px; padding: 8px 10px; }
.pattern-list { list-style: none; margin: 0; padding: 0; max-height: 260px; overflow-y: auto; }
.pattern-list li {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 4px;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
}
.pattern-list li span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pattern-list .btn { padding: 4px 10px; font-size: 12px; }
.pattern-list .empty { color: var(--text-dim); border: none; justify-content: center; }

/* toast */
.toast {
  position: fixed;
  left: 50%; bottom: 26px;
  transform: translateX(-50%);
  background: #101012;
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 13px;
  z-index: 99;
  box-shadow: 0 8px 24px rgba(0,0,0,.5);
  max-width: min(480px, calc(100vw - 32px));
}

/* ===== Mobile ===== */
@media (max-width: 720px) {
  .topbar { gap: 10px; padding: 8px 10px; }
  .brand h1 { font-size: 17px; }
  .field input[type="range"] { width: 72px; }
  .field input[type="number"], .field select { width: 58px; padding: 4px 6px; }
  .actions { margin-left: 0; width: 100%; }
  .actions .btn { flex: 1; }
  main { padding: 10px 8px 24px; }
  .pad, .ruler .pad-spacer { flex-basis: 96px; font-size: 12px; }
  .cell, .ruler .tick { flex-basis: 30px; }
  .cell { min-height: 40px; }
  .track, .ruler { gap: 7px; margin-bottom: 6px; }
  .cells { gap: 3px; }
}