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

:root {
  --bg: #0f1419;
  --surface: #1a2332;
  --grid: #243044;
  --snake: #4ade80;
  --snake-head: #22c55e;
  --food: #f87171;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --border: #334155;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100dvh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.game {
  width: min(100%, 28rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.game__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.game__title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.game__scores {
  display: flex;
  gap: 1.25rem;
}

.score {
  text-align: right;
}

.score__label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.score__value {
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.game__board-wrap {
  position: relative;
  border: 2px solid var(--border);
  border-radius: 0.5rem;
  overflow: hidden;
  background: var(--surface);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

#board {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 20, 25, 0.82);
  backdrop-filter: blur(2px);
}

.overlay[hidden] {
  display: none;
}

.overlay__panel {
  text-align: center;
  padding: 1.5rem;
}

.overlay__title {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.overlay__message {
  color: var(--muted);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 0.375rem;
  padding: 0.65rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--bg);
  background: var(--snake);
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

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

.btn:active {
  transform: scale(0.97);
}

.game__controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.game__hint {
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, 3rem);
  grid-template-rows: repeat(3, 3rem);
  gap: 0.35rem;
}

.dpad__btn {
  appearance: none;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.dpad__btn:hover {
  background: var(--grid);
  border-color: var(--accent);
}

.dpad__btn:active {
  background: var(--border);
}

.dpad__btn--up { grid-column: 2; grid-row: 1; }
.dpad__btn--left { grid-column: 1; grid-row: 2; }
.dpad__btn--down { grid-column: 2; grid-row: 3; }
.dpad__btn--right { grid-column: 3; grid-row: 2; }

@media (min-width: 480px) {
  .dpad {
    display: none;
  }
}