:root {
  --bg: #e8dccb;
  --bg-elev: #dfd1bd;
  --grid-line: #d4c5a4;
  --cell: #a8553a;
  --text: #3a302a;
  --muted: #7e7060;
  --accent: #6e7d54;
  --border: #c7b89c;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: ui-serif, Georgia, "Iowan Old Style", "Apple Garamond", Baskerville, "Times New Roman", serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 22px 20px 8px;
}

header h1 {
  margin: 0;
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--cell);
}

.subtitle {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
  font-style: italic;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  align-items: center;
  padding: 16px 20px;
  background: var(--bg-elev);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

button {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 14px;
  font-size: 13px;
  border-radius: 4px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s, transform 0.05s;
  font-family: inherit;
}

button:hover {
  border-color: var(--cell);
  background: #ddcfb5;
}

button:active {
  transform: translateY(1px);
}

button.primary {
  border-color: var(--cell);
  color: var(--cell);
}

button.primary.running {
  color: var(--accent);
  border-color: var(--accent);
}

.select,
.slider {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

select,
input[type="range"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
  font-family: inherit;
  font-size: 12px;
}

input[type="range"] {
  padding: 0;
  width: 120px;
  accent-color: var(--cell);
}

#speedLabel {
  color: var(--text);
  font-variant-numeric: tabular-nums;
  min-width: 40px;
  text-align: right;
}

.stats {
  display: flex;
  gap: 18px;
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stats strong {
  color: var(--text);
  font-weight: 600;
  margin-left: 4px;
  font-variant-numeric: tabular-nums;
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 18px;
  overflow: auto;
}

canvas {
  background: #e3d7be;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: crosshair;
  -webkit-user-select: none;
  user-select: none;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  font-style: italic;
  padding: 14px 20px 20px;
}

footer p {
  margin: 0;
}