:root {
  --bg: #111317;
  --surface: #1c1f26;
  --surface2: #252930;
  --border: #2e3340;
  --accent: #FFB800;
  --accent-dim: #cc9200;
  --accent-flash: #ffd84d;
  --tick-flash: #4a9eff;
  --text: #e8eaf0;
  --text-dim: #8a8f9e;
  --danger: #e05555;
  --success: #4caf6e;
  --radius: 10px;
  --radius-sm: 6px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 16px;
}

.app-container {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  position: relative;
}

header {
  text-align: center;
  padding: 8px 0 4px;
}

header h1 {
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-transform: uppercase;
}

/* ── Shared section card ── */
.metronome-section,
.interval-section,
.interval-status {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

/* ── Beat Indicators ── */
.beat-indicators {
  display: flex;
  gap: 8px;
}

.beat-indicator {
  flex: 1;
  height: 56px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  user-select: none;
  transition: background 0.12s, border-color 0.12s, box-shadow 0.08s;
}

.beat-num {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  line-height: 1;
}

.beat-pip {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: block;
}

/* Mode: accent */
.beat-indicator[data-mode="accent"]          { background: rgba(255,184,0,0.15); border-color: var(--accent); }
.beat-indicator[data-mode="accent"] .beat-pip { background: var(--accent); }

/* Mode: click */
.beat-indicator[data-mode="click"]           { background: rgba(74,158,255,0.1); border-color: #3a5a7a; }
.beat-indicator[data-mode="click"] .beat-pip  { background: #4a9eff; }

/* Mode: silent */
.beat-indicator[data-mode="silent"]          { background: transparent; border-color: var(--border); opacity: 0.4; }
.beat-indicator[data-mode="silent"] .beat-pip { background: transparent; border: 2px solid var(--text-dim); position: relative; }

/* Flash states */
.beat-indicator.flash-accent { background: var(--accent)  !important; border-color: var(--accent-flash) !important; box-shadow: 0 0 20px var(--accent); }
.beat-indicator.flash-click  { background: #4a9eff !important; border-color: #4a9eff !important; box-shadow: 0 0 14px #4a9eff; }

/* ── BPM Display ── */
.bpm-display {
  text-align: center;
  line-height: 1;
}

.bpm-value-input {
  font-size: 5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  background: transparent;
  border: none;
  outline: none;
  text-align: center;
  width: 100%;
  -moz-appearance: textfield;
  cursor: text;
}

.bpm-value-input::-webkit-inner-spin-button,
.bpm-value-input::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

.bpm-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-top: -4px;
}

/* ── BPM Slider ── */
.bpm-slider-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.slider-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  white-space: nowrap;
  min-width: 28px;
}

.slider-label:last-child {
  text-align: right;
}

.bpm-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 3px;
  background: var(--surface2);
  outline: none;
  cursor: pointer;
}

.bpm-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
  box-shadow: 0 0 8px rgba(245, 166, 35, 0.4);
}

.bpm-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

/* ── BPM Buttons ── */
.bpm-buttons {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.bpm-btn {
  flex: 1;
  padding: 10px 4px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  transition: background 0.15s, border-color 0.15s;
}

.bpm-btn:hover {
  background: var(--border);
  border-color: var(--accent-dim);
}

.bpm-btn:active {
  background: var(--accent-dim);
}

/* ── Subdivision Buttons ── */
.subdivision-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.subdivision-buttons {
  display: flex;
  gap: 6px;
}

.sub-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 4px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  cursor: pointer;
  min-height: 56px;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.sub-btn:hover {
  border-color: var(--accent-dim);
  color: var(--text);
}

.sub-btn.active {
  background: rgba(245, 166, 35, 0.15);
  border-color: var(--accent);
  color: var(--accent);
}

.sub-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.sub-name {
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 3px;
}

/* ── Start Row ── */
.start-row {
  display: flex;
  gap: 10px;
}

/* ── Start / Stop Button ── */
.start-stop-btn {
  flex: 1;
  padding: 16px;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  color: #111;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  min-height: 56px;
  transition: background 0.15s, transform 0.08s;
}

.start-stop-btn:hover {
  background: #ffb733;
}

.start-stop-btn:active {
  transform: scale(0.98);
}

.start-stop-btn.running {
  background: var(--danger);
  color: #fff;
}

.start-stop-btn.running:hover {
  background: #f06060;
}

/* ── Tap Button ── */
.tap-btn {
  flex: 1;
  padding: 16px;
  background: var(--surface2);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  min-height: 56px;
  transition: background 0.1s, border-color 0.1s, transform 0.06s;
}

.tap-btn:hover  { background: var(--border); border-color: var(--accent-dim); }
.tap-btn:active { transform: scale(0.96); background: rgba(255,184,0,0.15); border-color: var(--accent); }

/* ── Interval Toggle Row ── */
.interval-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 13px;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  top: 3px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: transform 0.2s, background 0.2s;
}

.toggle-switch input:checked + .toggle-slider {
  background: rgba(245, 166, 35, 0.2);
  border-color: var(--accent);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(22px);
  background: var(--accent);
}

/* ── Interval Config ── */
.interval-config {
  display: none;
}

.interval-config.visible {
  display: block;
}

.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.config-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.config-field label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.config-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  outline: none;
  min-height: 44px;
  transition: border-color 0.15s;
}

.config-input:focus {
  border-color: var(--accent);
}

.config-input:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.time-input {
  display: flex;
  align-items: center;
  gap: 4px;
}

.time-part {
  flex: 1;
  padding: 10px 6px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  outline: none;
  min-height: 44px;
  min-width: 0;
  transition: border-color 0.15s;
}

.time-part:focus {
  border-color: var(--accent);
}

.time-part:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.time-sep {
  color: var(--text-dim);
  font-weight: 700;
  font-size: 1.1rem;
}

/* ── Interval Status ── */
.interval-status {
  display: none;
}

.interval-status.visible {
  display: flex;
}

.status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.status-phase {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(245, 166, 35, 0.2);
  color: var(--accent);
  border: 1px solid var(--accent-dim);
}

.status-phase.rest {
  background: rgba(74, 158, 255, 0.15);
  color: var(--tick-flash);
  border-color: #2e6baa;
}

.status-phase.done {
  background: rgba(76, 175, 110, 0.15);
  color: var(--success);
  border-color: #357a52;
}

.status-set {
  font-size: 0.85rem;
  color: var(--text-dim);
  flex: 1;
  text-align: center;
}

.status-bpm {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
}

.status-countdown {
  font-size: 3.5rem;
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.progress-bar-container {
  height: 8px;
  background: var(--surface2);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 1s linear, background 0.3s;
}

.progress-bar.rest-mode {
  background: var(--tick-flash);
}

.status-next {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ── Done Overlay ── */
.done-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  z-index: 100;
  justify-content: center;
  align-items: center;
  padding: 24px;
}

.done-overlay.visible {
  display: flex;
}

.done-message {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  max-width: 320px;
  width: 100%;
}

.done-message h2 {
  font-size: 1.5rem;
  color: var(--success);
  margin-bottom: 12px;
}

.done-message p {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-bottom: 24px;
  line-height: 1.5;
}

.done-btn {
  padding: 12px 40px;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  color: #111;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  min-height: 44px;
  transition: background 0.15s;
}

.done-btn:hover {
  background: #ffb733;
}

/* ── Stopwatch ── */
.stopwatch-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stopwatch-display {
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.stopwatch-controls {
  display: flex;
  gap: 10px;
}

.stopwatch-btn {
  flex: 1;
  padding: 7px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  min-height: 38px;
  transition: background 0.15s, transform 0.08s;
}

.stopwatch-btn.start-stop {
  background: var(--accent);
  color: #111;
}

.stopwatch-btn.start-stop:hover { background: #ffb733; }
.stopwatch-btn.start-stop:active { transform: scale(0.98); }

.stopwatch-btn.start-stop.running {
  background: var(--danger);
  color: #fff;
}

.stopwatch-btn.start-stop.running:hover { background: #f06060; }

.stopwatch-btn.reset {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.stopwatch-btn.reset:hover {
  background: var(--border);
  color: var(--text);
}


/* ── Number input spinners — hide on mobile for cleaner look ── */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
}

input[type="number"] {
  -moz-appearance: textfield;
}

/* ── Responsive ── */
@media (max-width: 360px) {
  .subdivision-buttons {
    gap: 4px;
  }

  .sub-btn {
    padding: 6px 2px;
  }

  .sub-name {
    font-size: 0.55rem;
  }

  .config-grid {
    grid-template-columns: 1fr;
  }
}