:root {
  color-scheme: dark;
  --bg: #070a12;
  --panel: rgba(11, 16, 28, 0.88);
  --border: rgba(91, 116, 168, 0.4);
  --text: #edf3ff;
  --muted: #90a0c3;
  --snake: #ff4d67;
  --snake-head: #ff8a9b;
  --food: #54f2ff;
  --cell: rgba(18, 28, 49, 0.9);
  --glow: rgba(84, 242, 255, 0.18);
  --snake-glow: rgba(255, 77, 103, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(61, 95, 173, 0.18), transparent 34%),
    linear-gradient(180deg, #0a1020 0%, #070a12 55%, #04060c 100%);
  color: var(--text);
}

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

.panel {
  width: min(100%, 560px);
}

.status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--panel);
  box-shadow:
    0 22px 60px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.label,
.value,
.hint,
.overlay-title,
.overlay-text {
  margin: 0;
}

.label {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.value {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.sound-button,
.control {
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(20, 29, 49, 0.95), rgba(10, 15, 27, 0.95));
  color: var(--text);
  border-radius: 10px;
  font: inherit;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

.sound-button {
  padding: 10px 16px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.board-wrap {
  position: relative;
  border: 1px solid var(--border);
  background:
    linear-gradient(180deg, rgba(12, 19, 34, 0.96), rgba(6, 10, 20, 0.96)),
    var(--panel);
  padding: 12px;
  border-radius: 22px;
  box-shadow:
    0 28px 80px rgba(0, 0, 0, 0.45),
    inset 0 0 0 1px rgba(84, 242, 255, 0.04);
}

.board {
  width: min(100vw - 72px, 520px);
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(16, 1fr);
  gap: 2px;
  outline: none;
  padding: 2px;
  background:
    linear-gradient(rgba(84, 242, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(84, 242, 255, 0.05) 1px, transparent 1px);
  background-size: calc(100% / 16) calc(100% / 16);
  border-radius: 14px;
}

.cell {
  background: var(--cell);
  border-radius: 4px;
  box-shadow: inset 0 0 0 1px rgba(120, 146, 197, 0.06);
}

.cell.snake {
  background: var(--snake);
  box-shadow:
    0 0 14px var(--snake-glow),
    inset 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.cell.head {
  background: var(--snake-head);
  box-shadow:
    0 0 18px rgba(255, 138, 155, 0.42),
    inset 0 0 0 1px rgba(255, 255, 255, 0.18);
}

.cell.food {
  background: var(--food);
  box-shadow:
    0 0 18px var(--glow),
    inset 0 0 0 1px rgba(255, 255, 255, 0.2);
}

.overlay {
  position: absolute;
  inset: 12px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  text-align: center;
  background: rgba(7, 10, 18, 0.86);
  border-radius: 12px;
  backdrop-filter: blur(6px);
}

.hidden {
  display: none;
}

.overlay-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.overlay-text,
.hint {
  color: var(--muted);
}

.hint {
  margin: 12px 0 0;
  text-align: center;
  letter-spacing: 0.04em;
}

.controls {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(3, 64px);
  justify-content: center;
  gap: 8px;
}

.control {
  height: 56px;
  font-size: 1.25rem;
  cursor: pointer;
}

.control.up {
  grid-column: 2;
}

.control.left {
  grid-column: 1;
  grid-row: 2;
}

.control.down {
  grid-column: 2;
  grid-row: 2;
}

.control.right {
  grid-column: 3;
  grid-row: 2;
}

@media (min-width: 721px) {
  .controls {
    display: none;
  }
}

@media (max-width: 520px) {
  .status {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .restart-button {
    grid-column: 1 / -1;
  }

  .sound-button {
    grid-column: 1 / -1;
  }
}