:root {
  --bg: #f4f7fc;
  --panel: #ffffff;
  --ink: #1c2030;
  --ink-soft: #5a6178;
  --line: #e1e7f1;
  --line-strong: #cdd6e6;
  --accent: #2563eb;
  --accent-deep: #1e3a8a;
  --accent-soft: #dbe6ff;
  --good: #2bb673;
  --shadow: 0 1px 3px rgba(20, 24, 50, 0.06), 0 6px 20px rgba(20, 24, 50, 0.04);
  --radius: 10px;
  --gap: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 18px 60px;
}

header {
  text-align: center;
  margin-bottom: 22px;
}

h1.brand {
  margin: 0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 44px;
  font-weight: 800;
  font-style: italic;
  letter-spacing: -0.05em;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 70%, #0f172a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  display: inline-block;
  padding: 2px 6px 6px;
}

.subtitle {
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h2 {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: var(--gap);
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  gap: 10px;
}
.card-head h2 { margin: 0; }
.card-head button {
  font-size: 12px;
  padding: 5px 10px;
}
.card-actions {
  display: flex;
  gap: 8px;
}

button {
  appearance: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--ink);
  cursor: pointer;
  transition: all 0.1s ease;
  font-family: inherit;
}
button:hover { border-color: var(--accent); }
button.primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  font-weight: 600;
}
button.primary:hover { filter: brightness(1.05); }

/* Preset dropdown rows — full label always visible */
.preset-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.preset-label {
  font-size: 12px;
  color: var(--ink-soft);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  flex: 0 0 auto;
}
.preset-select {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 280px;
  padding: 7px 28px 7px 10px;
  font-size: 14px;
}

/* Transport */
.transport-row {
  display: flex;
  align-items: center;
  gap: 18px;
}
.master-vol {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 0;
  min-width: 0;
  max-width: 360px;
  margin-left: auto;
}
.master-vol .vol-icon {
  display: inline-flex;
  align-items: center;
  color: var(--ink-soft);
  flex: 0 0 auto;
}
.master-vol input[type=range] {
  flex: 1 1 auto;
  min-width: 0;
}
.play-btn {
  font-size: 16px;
  font-weight: 600;
  min-width: 110px;
  text-align: center;
  line-height: 1;
  padding: 10px 22px;
}

/* Tempo + drum preset row — wraps when there's not enough horizontal room */
.tempo-and-preset {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 18px;
  margin-bottom: 14px;
}
.tempo-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 18px;
  align-items: end;
  flex: 0 1 558px;
  max-width: 558px;
  min-width: 240px;
}
.drum-preset-wrap {
  flex: 0 1 220px;
  min-width: 200px;
  display: flex;
  align-items: end;
}
.drum-preset-wrap .preset-select { max-width: none; }

.control {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.control label {
  font-size: 12px;
  color: var(--ink-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  min-height: 28px;
}
.control input[type=range],
.control select {
  width: 100%;
  font-family: inherit;
}
.bpm-extras {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.bpm-extras input[type=number] {
  width: 52px;
  padding: 4px 6px;
  font-size: 13px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--panel);
  color: var(--ink);
  text-align: center;
  font-family: inherit;
  -moz-appearance: textfield;
  appearance: textfield;
}
.bpm-extras input[type=number]::-webkit-outer-spin-button,
.bpm-extras input[type=number]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.tap-btn {
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 500;
}

select {
  appearance: none;
  -webkit-appearance: none;
  background-color: var(--panel);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%232563eb' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='4 6 8 10 12 6'/></svg>");
  background-repeat: no-repeat;
  background-position: right 8px center;
  background-size: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 28px 6px 8px;
  font-size: 14px;
  color: var(--ink);
  font-family: inherit;
  cursor: pointer;
}
select:hover { border-color: var(--accent); }

input[type=range] {
  -webkit-appearance: none;
  height: 4px;
  background: var(--line);
  border-radius: 2px;
  outline: none;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 0 0 1px var(--line);
}
input[type=range]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid white;
}

/* Sequencer grid */
.grid {
  display: grid;
  grid-template-columns: 64px 56px 26px repeat(16, minmax(0, 1fr));
  gap: 4px;
  align-items: center;
}
.track,
.track-head,
.track-steps,
.track-toggle-wrap,
.track-controls { display: contents; }
.grid .track-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--ink);
}
.grid .track-vol { width: 100%; }
.grid .track-mute {
  font-size: 11px;
  padding: 4px 0;
  border-radius: 4px;
}
.track-toggle { display: none; }
.step {
  height: 32px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.05s, border-color 0.05s;
}
.step:hover { border-color: var(--accent); }
.step.beat-marker { background: #eef2fa; }
.step.on {
  background: var(--accent);
  border-color: var(--accent);
}
.step.playing {
  outline: 2px solid var(--good);
  outline-offset: 1px;
}
.step:focus { outline: none; }
.step:focus-visible {
  box-shadow: 0 0 0 2px var(--accent);
}

/* Chord section */
.chord-globals {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.chord-globals select { min-width: 0; }

.chord-slots {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.chord-slot {
  position: relative;
  background: var(--panel);
  border: 2px solid var(--line);
  border-radius: 8px;
  padding: 16px 10px 18px;
  text-align: center;
  user-select: none;
  cursor: pointer;
  transition: border-color 0.1s ease, background 0.1s ease, opacity 0.1s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-height: 92px;
}
.chord-slot:hover { border-color: var(--accent); }
.chord-slot.on { border-color: var(--line-strong); }
.chord-slot.on:hover { border-color: var(--accent); }
.chord-slot.off { opacity: 0.5; }
.chord-slot.playing {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.chord-slot .name {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1;
}
.chord-slot .deg {
  font-size: 11px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.chord-slot select {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  border: none;
  background: transparent;
  appearance: none;
  font-size: 16px;
  padding: 0;
  margin: 0;
}
.chord-slot .mute {
  position: absolute;
  bottom: 5px;
  right: 5px;
  z-index: 2;
  width: 22px;
  height: 20px;
  padding: 0;
  font-size: 10px;
  font-weight: 600;
  border-radius: 4px;
  line-height: 1;
  color: var(--ink-soft);
}
.chord-slot .mute:hover {
  border-color: var(--accent);
  color: var(--ink);
}

/* Section mixer (icon button + popover with vol slider + mute) */
.section-mixer {
  position: relative;
  display: inline-block;
}
.card-head .section-mixer-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 26px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 12px;
}
.card-head .section-mixer-toggle:hover {
  border-color: var(--accent);
  color: var(--ink);
}
.section-mixer-toggle svg { display: block; }
.section-mixer.open .section-mixer-toggle {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}
.popover-panel {
  position: absolute;
  top: calc(100% + 6px);
  z-index: 20;
  align-items: center;
  gap: 10px;
  width: 200px;
  padding: 10px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.section-mixer-controls {
  display: none;
  right: 0;
}
.section-mixer.open .section-mixer-controls { display: flex; }
.section-mixer .section-vol { flex: 1; min-width: 0; }
.card-head .section-mixer .section-mute {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 24px;
  padding: 0;
  font-size: 11px;
  font-weight: 600;
  border-radius: 4px;
}
/* Shared muted-button style — applies to track mutes (desktop + mobile),
   section mixer mutes, and the per-chord-slot mute when the slot is off. */
.grid .track-mute.muted,
.track-controls .track-mute.muted,
.card-head .section-mixer .section-mute.muted,
.chord-slot.off .mute {
  background: var(--ink-soft);
  color: white;
  border-color: var(--ink-soft);
}

footer {
  text-align: center;
  margin-top: 20px;
  color: var(--ink-soft);
}

/* Responsive — drum sequencer just shrinks, never stacks */
@media (max-width: 900px) {
  .grid { grid-template-columns: 56px 48px 24px repeat(16, minmax(0, 1fr)); }
  .grid .track-label { font-size: 12px; }
  .step { height: 28px; }
}
@media (max-width: 640px) {
  h1.brand { font-size: 34px; }
  .subtitle { font-size: 11px; letter-spacing: 0.12em; }

  /* Hide vol/mute columns; show toggle icon that opens a mixer popover */
  .grid {
    grid-template-columns: 48px 26px repeat(16, minmax(0, 1fr));
    gap: 3px;
  }
  .grid .track-vol,
  .grid .track-mute { display: none; }
  .track-toggle-wrap {
    display: block;
    position: relative;
  }
  .track-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 4px;
    background: var(--panel);
    color: var(--ink-soft);
    cursor: pointer;
  }
  .track-toggle:hover { border-color: var(--accent); color: var(--ink); }
  .track-toggle svg { display: block; }
  .track-toggle-wrap.open .track-toggle {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
  }
  .track-controls {
    display: none;
    left: 0;
  }
  .track-toggle-wrap.open .track-controls { display: flex; }
  .track-controls .track-vol {
    display: block;
    flex: 1;
    width: auto;
  }
  .track-controls .track-mute {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 24px;
    padding: 0;
    font-size: 11px;
    border-radius: 4px;
  }

  .grid .track-label { font-size: 11px; }
  .step { height: 24px; }

  .chord-slots { gap: 6px; }
  .chord-slot {
    padding: 10px 4px 16px;
    min-height: 72px;
  }
  .chord-slot .name { font-size: 17px; }
  .chord-slot .deg { font-size: 10px; }
  .chord-slot .mute { width: 20px; height: 18px; }
}