:root {
  --wood-dark: #5b3a29;
  --wood: #8a5a3b;
  --wood-light: #c98c53;
  --cream: #fbf3e6;
  --accent: #e2a541;
  --accent-strong: #d4741e;
  --ink: #2b1b12;
  --good: #4caf7d;
  --danger: #d1495b;
  --radius: 14px;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #fff8ec 0%, #f3e2c8 100%);
  color: var(--ink);
}

/* ---------------------------------------------------------------------
 * Left sidebar nav (collapsed icon rail by default, expands on click)
 * ------------------------------------------------------------------- */
.side-nav {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 56px;
  background: var(--wood-dark);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  overflow: hidden;
  z-index: 30;
  transition: width 0.18s ease, box-shadow 0.18s ease;
}

.side-nav.expanded {
  width: 190px;
  box-shadow: 6px 0 18px rgba(43, 27, 18, 0.35);
}

.side-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  background: transparent;
  border: none;
  cursor: pointer;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--cream);
  border-radius: 2px;
}

.hamburger {
  position: relative;
}

.hamburger::before {
  position: absolute;
  top: -7px;
  left: 0;
}

.hamburger::after {
  position: absolute;
  top: 7px;
  left: 0;
}

.side-nav-links {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.5rem 0;
}

.side-nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.65rem 1rem;
  color: #e6d3b3;
  text-decoration: none;
  white-space: nowrap;
  font-weight: 600;
}

.side-nav-link:hover {
  background: rgba(255, 255, 255, 0.08);
}

.side-nav-link.active {
  background: var(--accent-strong);
  color: #fff;
}

.side-nav-icon {
  font-size: 1.3rem;
  width: 24px;
  flex-shrink: 0;
  text-align: center;
}

.side-nav-label {
  opacity: 0;
  transition: opacity 0.12s ease;
}

.side-nav.expanded .side-nav-label {
  opacity: 1;
}

.page-content {
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-left: 56px;
}

@media (max-width: 480px) {
  .page-content {
    padding-left: 44px;
  }

  .side-nav {
    width: 44px;
  }

  .side-nav-toggle {
    width: 44px;
    height: 44px;
  }
}

.app-header {
  text-align: center;
  padding: 1.5rem 1rem 0.5rem;
}

.app-header h1 {
  margin: 0;
  color: var(--wood-dark);
  letter-spacing: 0.5px;
}

.subtitle {
  margin: 0.25rem 0 0;
  color: #7a5c46;
  font-size: 0.95rem;
}

.app-main {
  width: 100%;
  max-width: 900px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel {
  background: var(--cream);
  border: 1px solid #e6d3b3;
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: 0 4px 14px rgba(91, 58, 41, 0.12);
}

/* Controls */
.controls-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.tempo-group {
  flex: 1;
  min-width: 260px;
}

.tempo-group input[type="range"] {
  flex: 1;
  accent-color: var(--accent-strong);
}

.tempo-group input[type="number"] {
  width: 4.5rem;
  padding: 0.3rem 0.4rem;
  border-radius: 8px;
  border: 1px solid #d8bd93;
  font-size: 1rem;
  text-align: center;
}

.tempo-value {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.bpm-label {
  font-weight: 600;
  color: var(--wood-dark);
}

.sound-toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--wood-dark);
  user-select: none;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: var(--accent-strong);
  color: white;
  box-shadow: 0 3px 8px rgba(212, 116, 30, 0.4);
}

.btn-primary.playing {
  background: var(--danger);
  box-shadow: 0 3px 8px rgba(209, 73, 91, 0.4);
}

.btn-secondary {
  background: var(--wood-light);
  color: white;
}

.btn-small {
  background: #e9d3ac;
  color: var(--wood-dark);
  padding: 0.35rem 0.8rem;
  font-size: 0.85rem;
}

/* Beat indicator */
.beat-indicator {
  display: flex;
  gap: 0.5rem;
}

.beat-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #e6d3b3;
  border: 2px solid #cbae7f;
  transition: background 0.08s ease, transform 0.08s ease;
}

.beat-dot.active {
  background: var(--accent);
  transform: scale(1.25);
  border-color: var(--accent-strong);
}

.beat-dot.accent.active {
  background: var(--accent-strong);
}

/* Chord display */
.display-panel {
  text-align: center;
}

.chord-name {
  font-size: 4rem;
  font-weight: 800;
  color: var(--wood-dark);
  letter-spacing: 1px;
  min-height: 5rem;
  line-height: 1;
}

.visuals {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin-top: 1rem;
}

.visual-box h2 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--wood-dark);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.visual-box svg {
  width: 220px;
  height: auto;
  background: white;
  border-radius: 10px;
  border: 1px solid #e6d3b3;
}

.staff-box {
  flex: 1 1 420px;
  max-width: 460px;
}

.staff-box svg {
  width: 100%;
  max-width: 460px;
}

/* Chord select */
.chord-select-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chord-select-header h2 {
  margin: 0;
  color: var(--wood-dark);
  font-size: 1.1rem;
}

.chord-select-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.order-toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--wood-dark);
  font-size: 0.85rem;
  white-space: nowrap;
  user-select: none;
  cursor: pointer;
  padding-right: 0.5rem;
  border-right: 1px solid #e6d3b3;
}

.order-toggle input {
  accent-color: var(--accent-strong);
}

.pool-hint {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: #9a8062;
}

/* Tap-to-move transfer list: two columns, "In Rotation" and "Available" */
.pool-transfer {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.75rem;
  align-items: flex-start;
}

.pool-column {
  flex: 1;
  min-width: 0;
  background: #fff;
  border: 1px solid #e6d3b3;
  border-radius: 10px;
  padding: 0.75rem;
}

.pool-column h3 {
  margin: 0 0 0.6rem;
  font-size: 0.95rem;
  color: var(--wood-dark);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.pool-count {
  background: #f3e2c8;
  color: var(--wood-dark);
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
}

.chip-group-heading {
  margin: 0.9rem 0 0.4rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #9a8062;
}

.chip-group-heading:first-of-type {
  margin-top: 0;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pool-empty {
  margin: 0;
  font-size: 0.85rem;
  color: #9a8062;
  font-style: italic;
}

.chord-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: #f3e2c8;
  border: 1px solid #e6d3b3;
  border-radius: 999px;
  padding: 0.3rem 0.65rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--wood-dark);
  cursor: pointer;
  transition: background 0.12s ease, transform 0.08s ease, border-color 0.12s ease;
}

.chord-chip:hover {
  background: #ecd3a4;
  border-color: var(--accent);
}

.chord-chip:active {
  transform: scale(0.95);
}

.chord-chip.in-rotation {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #fff;
}

.chord-chip.in-rotation:hover {
  background: var(--danger);
  border-color: var(--danger);
}

.chip-icon {
  font-weight: 800;
  opacity: 0.8;
}

@media (max-width: 640px) {
  .pool-transfer {
    flex-direction: column;
    align-items: stretch;
  }

  .pool-column {
    width: 100%;
  }
}

.app-footer {
  color: #9a8062;
  font-size: 0.8rem;
  padding: 1rem;
  text-align: center;
}

@media (max-width: 480px) {
  .chord-name {
    font-size: 3rem;
  }
  .visual-box svg {
    width: 45vw;
  }
  .staff-box {
    max-width: none;
  }
  .staff-box svg {
    width: 90vw;
    max-width: none;
  }
}

@media (max-width: 640px) {
  .controls-panel {
    flex-direction: column;
    align-items: stretch;
  }

  .control-group {
    width: 100%;
  }

  .tempo-group {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    flex-wrap: nowrap;
    min-width: 0;
    width: 100%;
    gap: 0.5rem;
  }

  .tempo-group label {
    flex-basis: auto;
  }

  .tempo-group input[type="range"] {
    flex-basis: auto;
    width: 100%;
  }

  .tempo-value {
    align-self: flex-start;
  }

  .beat-indicator {
    width: 100%;
    justify-content: center;
    order: 3;
  }
}