:root {
  --bg: #1a1b27;
  --panel: #1f2335;
  --grid: #262a3e;
  --border: #414868;
  --label: #565f89;
  --value: #70a5fd;
  --tail: #38bdae;
  --neck: #70a5fd;
  --head: #bf91f3;
  --food: #f7768e;
  --cell: 20px;
  --span: 20;
}

* {
  box-sizing: border-box;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--label);
  font-family: Menlo, "SF Mono", Consolas, monospace;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.hud {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 0 6px 14px;
}

.hud-label,
.hud-hint {
  font-size: 13px;
  letter-spacing: 0.14em;
}

.hud-value {
  font-size: 22px;
  color: var(--value);
}

.hud-hint {
  margin-left: auto;
}

.game-container {
  position: relative;
  width: calc(var(--cell) * var(--span));
  height: calc(var(--cell) * var(--span));
  border: 1px solid var(--border);
  border-radius: 10px;
  background-color: var(--panel);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: var(--cell) var(--cell);
  overflow: hidden;
}

.snake,
.food {
  position: absolute;
  width: var(--cell);
  height: var(--cell);
}

.snake {
  border-radius: 5px;
  transform: scale(0.8);
  background: color-mix(in oklab, var(--neck) calc(var(--t, 1) * 100%), var(--tail));
}

.snake.head {
  border-radius: 6px;
  transform: scale(0.9);
  background: var(--head);
}

.food {
  border-radius: 50%;
  transform: scale(0.62);
  background: var(--food);
  animation: pulse 0.8s steps(1, end) infinite;
}

@keyframes pulse {
  50% {
    transform: scale(0.76);
  }
}