:root {
  color-scheme: light;
  --bg: #f4f1e8;
  --panel: #fffdf7;
  --panel-border: #d9d2c3;
  --text: #2c2418;
  --muted: #6f6556;
  --snake: #2f6b3b;
  --snake-head: #1f4f2a;
  --food: #c4512d;
  --cell: #efe8da;
  --cell-border: #e2dacb;
  --button: #2c2418;
  --button-text: #fffdf7;
  --button-muted: #e8e0d2;
  --input-bg: #fffdf7;
  --score-row: #f0e9db;
  --board-frame: #ddd4c5;
}

body[data-theme="black"] {
  color-scheme: dark;
  --bg: #0d0d0d;
  --panel: #171717;
  --panel-border: #303030;
  --text: #f4efe4;
  --muted: #beb4a3;
  --snake: #7ccc73;
  --snake-head: #b5f0ad;
  --food: #ff8b61;
  --cell: #222222;
  --cell-border: #2d2d2d;
  --button: #f4efe4;
  --button-text: #101010;
  --button-muted: #252525;
  --input-bg: #111111;
  --score-row: #202020;
  --board-frame: #2a2a2a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Georgia, "Times New Roman", serif;
  background: var(--bg);
  color: var(--text);
  overscroll-behavior: none;
}

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

.game-shell {
  width: min(100%, 680px);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(44, 36, 24, 0.08);
}

.game-header,
.toolbar,
.settings-panel,
.leaderboard-header,
.leaderboard-item {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.game-header {
  margin-bottom: 16px;
}

h1,
.score-value,
.score-label,
.subtitle,
.status-text,
.help-text {
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1;
}

.subtitle,
.help-text,
.status-text {
  color: var(--muted);
}

.status-panel {
  text-align: right;
  min-width: 96px;
}

.score-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.score-value {
  font-size: 2rem;
  font-weight: 700;
}

.toolbar {
  flex-wrap: wrap;
  margin-bottom: 16px;
}

button {
  border: 1px solid var(--button);
  border-radius: 999px;
  padding: 10px 16px;
  font: inherit;
  cursor: pointer;
  background: var(--button);
  color: var(--button-text);
}

button.secondary,
.control-button {
  background: var(--button-muted);
  color: var(--text);
  border-color: var(--panel-border);
}

.settings-panel {
  margin-bottom: 16px;
  gap: 12px;
  flex-wrap: wrap;
}

.field {
  flex: 1 1 220px;
  display: grid;
  gap: 6px;
}

.field-label,
.leaderboard-note {
  color: var(--muted);
  font-size: 0.9rem;
}

.text-input {
  width: 100%;
  min-height: 44px;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--input-bg);
  color: var(--text);
  padding: 10px 14px;
  font: inherit;
}

.text-input::placeholder {
  color: var(--muted);
}

.board {
  display: grid;
  grid-template-columns: repeat(16, minmax(0, 1fr));
  gap: 3px;
  padding: 12px;
  background: var(--board-frame);
  border-radius: 14px;
  border: 1px solid var(--panel-border);
  outline: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.cell {
  aspect-ratio: 1;
  border-radius: 6px;
  background: var(--cell);
  border: 1px solid var(--cell-border);
}

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

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

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

.controls {
  width: min(100%, 240px);
  margin: 20px auto 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.control-button {
  min-height: 52px;
  font-size: 1.125rem;
  touch-action: manipulation;
}

.help-text {
  margin-top: 16px;
  text-align: center;
}

.leaderboard {
  margin-top: 22px;
  border-top: 1px solid var(--panel-border);
  padding-top: 18px;
}

h2 {
  margin: 0;
  font-size: 1.1rem;
}

.leaderboard-list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.leaderboard-item,
.leaderboard-empty {
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: var(--score-row);
  padding: 10px 12px;
}

.leaderboard-rank,
.leaderboard-score {
  font-weight: 700;
}

.leaderboard-rank {
  width: 24px;
}

.leaderboard-name {
  flex: 1;
}

.leaderboard-empty {
  color: var(--muted);
}

@media (max-width: 640px) {
  body {
    min-height: 100dvh;
  }

  .game-shell {
    padding: 18px;
  }

  .game-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .status-panel {
    min-width: 0;
    text-align: left;
  }

  .toolbar {
    align-items: stretch;
  }

  .settings-panel,
  .toolbar button {
    min-height: 48px;
  }

  .settings-panel,
  .leaderboard-header,
  .leaderboard-item {
    align-items: stretch;
    flex-direction: column;
  }

  .board {
    width: 100%;
    padding: 8px;
    gap: 2px;
  }

  .controls {
    width: min(100%, 280px);
    gap: 12px;
  }

  .control-button {
    min-height: 56px;
    font-size: 1rem;
  }

  .leaderboard-rank {
    width: auto;
  }
}