:root {
  --color-background: #1e1e2e;
  --color-surface: #2a2a3d;
  --color-board: #16161f;
  --color-snake-head: #4ade80;
  --color-snake-body: #22c55e;
  --color-food: #f87171;
  --color-text: #e5e7eb;
  --color-text-muted: #9ca3af;
  --color-accent: #60a5fa;
}

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

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-background);
  color: var(--color-text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 24px;
}

.game-title {
  font-size: 28px;
  letter-spacing: 4px;
}

.score-board {
  display: flex;
  gap: 32px;
  background: var(--color-surface);
  padding: 12px 24px;
  border-radius: 8px;
}

.score-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 80px;
}

.score-label {
  font-size: 12px;
  color: var(--color-text-muted);
}

.score-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
}

.canvas-wrapper {
  position: relative;
}

#gameCanvas {
  background: var(--color-board);
  border-radius: 8px;
  display: block;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: rgba(22, 22, 31, 0.85);
  border-radius: 8px;
  text-align: center;
}

.overlay.hidden {
  display: none;
}

.overlay-message {
  font-size: 18px;
  color: var(--color-text);
  padding: 0 24px;
  white-space: pre-line;
}

.restart-button {
  padding: 10px 20px;
  font-size: 14px;
  border: none;
  border-radius: 6px;
  background: var(--color-accent);
  color: #0b1220;
  cursor: pointer;
  font-weight: 700;
}

.restart-button.hidden {
  display: none;
}

.restart-button:hover {
  filter: brightness(1.1);
}

.controls-hint {
  color: var(--color-text-muted);
  font-size: 13px;
}