:root {
  --bg: #f5f5f5;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --grid: #e5e7eb;
  --snake: #1f7a5a;
  --snake-head: #14553f;
  --food: #d64545;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  min-height: 100vh;
  padding: 16px;
  display: grid;
  justify-items: center;
  align-content: start;
  gap: 14px;
}

.hud {
  text-align: center;
}

.hud h1 {
  margin: 0;
  font-size: 1.5rem;
}

.score,
.status {
  margin: 6px 0 0;
}

.status {
  color: var(--muted);
  min-height: 1.25rem;
}

.board {
  width: min(92vmin, 500px);
  aspect-ratio: 1 / 1;
  background: var(--panel);
  border: 1px solid #d1d5db;
  display: grid;
  grid-template-columns: repeat(20, 1fr);
  grid-template-rows: repeat(20, 1fr);
}

.cell {
  border: 1px solid var(--grid);
}

.cell.snake {
  background: var(--snake);
}

.cell.snake-head {
  background: var(--snake-head);
}

.cell.food {
  background: var(--food);
}

.controls {
  display: grid;
  gap: 8px;
  justify-items: center;
}

.row {
  display: flex;
  gap: 8px;
}

button {
  min-width: 72px;
  padding: 8px 12px;
  border: 1px solid #c4c9cf;
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

button:active {
  background: #f0f2f4;
}