:root {
  color-scheme: light;
  --bg: #101827;
  --panel: #172033;
  --panel-alt: #1d2940;
  --text: #f6f7fb;
  --muted: #9ca7bd;
  --snake: #57d38c;
  --snake-head: #9cf0bf;
  --food: #ff6d5f;
  --grid: rgba(255, 255, 255, 0.06);
  --shadow: rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top, #22314f, var(--bg) 55%);
  color: var(--text);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.game-card {
  width: min(92vw, 520px);
  background: linear-gradient(180deg, var(--panel), var(--panel-alt));
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  box-shadow: 0 30px 60px var(--shadow);
  padding: 20px;
}

.game-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
}

.score-panel {
  min-width: 92px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.05);
  text-align: right;
}

.score-label,
.status,
.hint {
  color: var(--muted);
}

.score-label {
  display: block;
  font-size: 0.75rem;
  margin-bottom: 4px;
}

#score {
  font-size: 1.6rem;
}

.status {
  min-height: 1.5em;
  margin: 16px 0 14px;
}

.board {
  display: grid;
  grid-template-columns: repeat(18, 1fr);
  gap: 3px;
  background: rgba(255, 255, 255, 0.05);
  padding: 10px;
  border-radius: 20px;
  aspect-ratio: 1 / 1;
}

.cell {
  background: rgba(255, 255, 255, 0.04);
  border-radius: 6px;
}

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

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

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

.controls {
  display: grid;
  gap: 8px;
  justify-items: center;
  margin-top: 16px;
}

.controls-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

button {
  border: 0;
  border-radius: 14px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}

button:hover,
button:focus-visible {
  background: rgba(255, 255, 255, 0.14);
  outline: none;
}

.restart {
  min-width: 100px;
}

.hint {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  font-size: 0.92rem;
}

@media (max-width: 520px) {
  .game-card {
    width: min(100%, 420px);
    padding: 16px;
    border-radius: 20px;
  }

  .board {
    gap: 2px;
    padding: 8px;
  }

  .hint {
    flex-direction: column;
    align-items: center;
  }
}