:root {
  color-scheme: dark;
  --bg: #111316;
  --panel: #1b2025;
  --panel-strong: #222932;
  --line: #343d48;
  --text: #f3f6f8;
  --muted: #aab4bf;
  --accent: #22c55e;
  --accent-strong: #16a34a;
  --warn: #f59e0b;
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.3);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(120deg, rgba(34, 197, 94, 0.14), transparent 34%),
    radial-gradient(circle at 90% 8%, rgba(245, 158, 11, 0.18), transparent 25%),
    var(--bg);
  color: var(--text);
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0;
}

.mixer {
  background: rgba(27, 32, 37, 0.94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.topbar,
.master-panel,
.metronome-panel,
.track {
  display: flex;
  align-items: center;
  gap: 16px;
}

.topbar {
  justify-content: space-between;
  padding: 28px;
  background: var(--panel-strong);
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.section-label {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3.5rem);
  line-height: 1;
  letter-spacing: 0;
}

.song-heading {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.youtube-button {
  display: inline-grid;
  place-items: center;
  min-height: 36px;
  border: 1px solid #ef4444;
  border-radius: 6px;
  padding: 0 12px;
  background: #ef4444;
  color: #fff;
  font-size: 0.82rem;
  font-weight: 900;
  cursor: pointer;
  text-decoration: none;
}

.youtube-button.disabled {
  border-color: var(--line);
  background: #15191d;
  color: var(--muted);
  cursor: not-allowed;
  opacity: 0.75;
  pointer-events: none;
}

h2 {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.1;
  letter-spacing: 0;
}

.transport {
  display: flex;
  gap: 10px;
}

.song-picker {
  display: grid;
  gap: 8px;
  min-width: min(280px, 100%);
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  text-transform: uppercase;
}

.song-picker select {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  background: #11161a;
  color: var(--text);
  text-transform: none;
}

.icon-button,
.play-button,
.text-button,
.solo-button {
  border: 1px solid var(--line);
  color: var(--text);
  background: #15191d;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.icon-button,
.play-button {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 999px;
}

.icon-button.small {
  width: 38px;
  height: 38px;
  border-radius: 6px;
}

.play-button {
  width: 58px;
  height: 58px;
  background: var(--accent);
  color: #07110b;
  border-color: var(--accent);
  font-weight: 900;
}

button:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.timeline {
  padding: 24px 28px 14px;
}

.time-row {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  margin-bottom: 10px;
}

.seek-bar,
.track-volume,
#metronomeVolume,
#masterVolume {
  width: 100%;
  accent-color: var(--accent);
}

.loop-panel {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.loop-range {
  position: relative;
  height: 28px;
}

.loop-range::before {
  content: "";
  position: absolute;
  top: 11px;
  left: 0;
  right: 0;
  height: 6px;
  border-radius: 999px;
  background: #11161a;
}

.loop-selection {
  position: absolute;
  top: 11px;
  left: var(--loop-start, 0%);
  right: calc(100% - var(--loop-end, 100%));
  height: 6px;
  border-radius: 999px;
  background: rgba(34, 197, 94, 0.45);
  pointer-events: none;
}

.loop-range input {
  appearance: none;
  -webkit-appearance: none;
  position: absolute;
  inset: 0;
  width: 100%;
  margin: 0;
  background: transparent;
  pointer-events: none;
}

.loop-range input::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: transparent;
}

.loop-range input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  margin-top: -5px;
  border: 2px solid #07110b;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  pointer-events: auto;
}

.loop-range input::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: transparent;
}

.loop-range input::-moz-range-progress {
  background: transparent;
}

.loop-range input::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border: 2px solid #07110b;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  pointer-events: auto;
}

#loopStartRange {
  z-index: 2;
}

#loopEndRange {
  z-index: 3;
}

.loop-row,
.loop-times {
  display: flex;
  align-items: center;
  gap: 10px;
}

.loop-row {
  justify-content: space-between;
}

.loop-panel output {
  color: var(--muted);
  text-align: left;
}

#loopToggleButton.active {
  background: var(--accent);
  color: #07110b;
  border-color: var(--accent);
}

.master-panel {
  flex-wrap: wrap;
  padding: 18px 28px 26px;
  border-bottom: 1px solid var(--line);
}

.master-volume,
.volume-control {
  display: grid;
  grid-template-columns: 86px minmax(160px, 1fr) 52px;
  align-items: center;
  gap: 12px;
}

.master-volume {
  flex: 1 1 440px;
}

output {
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.text-button,
.solo-button {
  min-height: 38px;
  border-radius: 6px;
  padding: 0 14px;
  font-weight: 700;
}

.track-list {
  display: grid;
  gap: 1px;
  background: var(--line);
}

.metronome-panel {
  flex-direction: column;
  align-items: stretch;
  padding: 24px 28px 28px;
  background: #181d22;
  border-top: 1px solid var(--line);
}

.metronome-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.metronome-controls {
  display: grid;
  grid-template-columns: minmax(120px, 180px) minmax(300px, 440px) minmax(120px, 180px) minmax(240px, 1fr);
  gap: 16px;
}

.metronome-control {
  display: grid;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.offset-control {
  display: grid;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.offset-buttons {
  display: grid;
  grid-template-columns: 38px 38px minmax(92px, 1fr) 38px 38px;
  align-items: center;
  gap: 8px;
}

#metronomeOffsetValue {
  color: var(--muted);
  text-align: center;
}

.metronome-control input[type="number"] {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0 12px;
  background: #11161a;
  color: var(--text);
}

.detect-inline {
  min-width: 0;
  padding: 0 10px;
}

.bpm-status {
  align-self: end;
  min-height: 18px;
  color: var(--muted);
  font-size: 0.86rem;
}

.metronome-control:has(input[type="range"]) {
  grid-template-columns: 86px minmax(160px, 1fr) 52px;
  color: var(--text);
}

.track {
  justify-content: space-between;
  background: var(--panel);
  padding: 18px 28px;
}

.track-main {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 220px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
}

.track-enabled {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-box {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 2px solid var(--line);
  border-radius: 5px;
  background: #11161a;
}

.track-enabled:checked + .toggle-box {
  background: var(--accent);
  border-color: var(--accent);
}

.track-enabled:checked + .toggle-box::after {
  content: "";
  width: 6px;
  height: 11px;
  border: solid #07110b;
  border-width: 0 3px 3px 0;
  transform: rotate(45deg) translateY(-1px);
}

.track-name {
  font-size: 1.05rem;
  font-weight: 800;
}

.solo-button.active {
  background: var(--warn);
  color: #151006;
  border-color: var(--warn);
}

.volume-control {
  flex: 1 1 460px;
}

.volume-label {
  color: var(--muted);
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 20px, 1080px);
    padding: 10px 0;
  }

  .topbar,
  .track {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar,
  .timeline,
  .master-panel,
  .metronome-panel,
  .track {
    padding-left: 18px;
    padding-right: 18px;
  }

  .transport {
    width: 100%;
  }

  .play-button,
  .icon-button {
    flex: 1;
    border-radius: 6px;
  }

  .master-volume,
  .metronome-control:has(input[type="range"]),
  .volume-control {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .loop-row {
    align-items: stretch;
    flex-direction: column;
  }

  .metronome-header {
    align-items: stretch;
    flex-direction: column;
  }

  .metronome-controls {
    grid-template-columns: 1fr;
  }

  output {
    text-align: left;
  }
}