:root {
  --space-fibonacci-1: 8px;
  --space-fibonacci-2: 13px;
  --space-fibonacci-3: 21px;
  --space-fibonacci-4: 34px;

  --surface-cool-50: #6b7280;
  --surface-cool-70: #374151;
  --surface-cool-90: #111827;
  --surface-cool-95: #030712;
  --accent-bright: #22d3ee;
  --accent-dim: #0891b2;
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;

  --type-xs: 0.75rem;
  --type-sm: 0.875rem;
  --type-base: 1rem;
  --type-lg: 1.25rem;
  --type-xl: 1.5rem;
}

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

html,
body {
  background: var(--surface-cool-95);
  color: var(--text-primary);
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: var(--type-base);
  line-height: 1;
  height: 100%;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  height: 100%;
  padding: var(--space-fibonacci-4);
  gap: var(--space-fibonacci-3);
}

.header {
  display: flex;
  align-items: baseline;
  gap: var(--space-fibonacci-2);
}

.label {
  font-size: var(--type-xs);
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.depth-value {
  font-size: var(--type-lg);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent-bright);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: var(--space-fibonacci-1);
  width: min(560px, calc(100% - var(--space-fibonacci-4) * 2));
  aspect-ratio: 1 / 1;
  background: var(--surface-cool-90);
  padding: 12px;
  border: 1px solid var(--surface-cool-70);
}

.cell {
  background: var(--surface-cool-50);
  border: 1px solid var(--surface-cool-70);
  cursor: pointer;
  transition: none;
  position: relative;
}

.cell:active,
.cell.active {
  background: var(--accent-dim);
  border-color: var(--accent-bright);
}

.cell.committed {
  background: var(--surface-cool-70);
  border-color: var(--surface-cool-90);
  opacity: 0.5;
}

#visualizer-wrap {
  width: min(560px, calc(100% - var(--space-fibonacci-4) * 2));
  aspect-ratio: 8 / 1;
  border: 1px solid var(--surface-cool-70);
  overflow: hidden;
  background: var(--surface-cool-90);
}

#visualizer {
  display: block;
  width: 100%;
  height: 100%;
}

.baseline-line {
  stroke: var(--surface-cool-70);
  stroke-width: 1;
  stroke-dasharray: 4 4;
}

.waveform-line {
  fill: none;
  stroke: var(--accent-bright);
  stroke-width: 1.5;
  stroke-linejoin: round;
}

.latency-label {
  font-size: var(--type-xs);
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  min-height: var(--type-xs);
}