:root {
  --bg: #f4f5f8;
  --surface: #ffffff;
  --text: #1a1d23;
  --muted: #5d6472;
  --border: #d9dde4;
  --accent: #4f46e5;
  --accent-text: #ffffff;

  /* Board colors (read by sketch.js) */
  --board: #ffffff;
  --tile: #f1f3f6;
  --snake: #16a34a;
  --head: #15803d;
  --eye: #ffffff;
  --food: #dc2626;
  --overlay: #ffffff;
  --overlay-text: #1a1d23;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a21;
    --text: #e8eaef;
    --muted: #9aa1ad;
    --border: #2c313c;
    --accent: #818cf8;
    --accent-text: #0f1115;

    --board: #1b1f27;
    --tile: #20252e;
    --snake: #22c55e;
    --head: #4ade80;
    --eye: #0f1115;
    --food: #ef4444;
    --overlay: #0f1115;
    --overlay-text: #e8eaef;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

.top,
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.top {
  padding-top: 20px;
  padding-bottom: 12px;
}

h1 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
}

.sub {
  margin: 4px 0 0;
  color: var(--muted);
}

/* Controls */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  align-items: center;
  justify-content: space-between;
  max-width: 560px;
  margin: 0 auto 12px;
}

.group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

button {
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

button:hover {
  border-color: var(--muted);
}

button:disabled {
  opacity: 0.45;
  cursor: default;
}

button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  min-width: 104px;
  justify-content: center;
}

kbd {
  font-family: inherit;
  font-size: 0.72rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0 4px;
}

.stats {
  display: flex;
  gap: 20px;
  margin: 0;
}

.stats div {
  display: flex;
  gap: 6px;
  align-items: baseline;
}

.stats dt {
  color: var(--muted);
  font-size: 0.85rem;
}

.stats dd {
  margin: 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* Board */

#stage {
  display: flex;
  justify-content: center;
}

#stage canvas {
  display: block;
  border-radius: 6px;
  border: 1px solid var(--border);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

/* On-screen arrows, shown only on touch devices */

.dpad {
  display: none;
  grid-template-columns: repeat(3, 64px);
  grid-template-rows: repeat(2, 52px);
  gap: 8px;
  justify-content: center;
  margin-top: 14px;
}

.dpad button {
  justify-content: center;
  padding: 0;
  user-select: none;
  -webkit-user-select: none;
}

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

.dpad svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

.dpad [data-dir="up"]    { grid-column: 2; grid-row: 1; }
.dpad [data-dir="left"]  { grid-column: 1; grid-row: 2; }
.dpad [data-dir="down"]  { grid-column: 2; grid-row: 2; }
.dpad [data-dir="right"] { grid-column: 3; grid-row: 2; }

.dpad [data-dir="left"] svg  { transform: rotate(-90deg); }
.dpad [data-dir="down"] svg  { transform: rotate(180deg); }
.dpad [data-dir="right"] svg { transform: rotate(90deg); }

/* Status */

.footer {
  max-width: 560px;
  margin: 0 auto;
  padding: 12px 0 20px;
}

#status {
  margin: 0;
  min-height: 1.45em;
}

.keys {
  margin: 6px 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

@media (pointer: coarse) {
  .dpad {
    display: grid;
  }

  .keys {
    display: none;
  }
}

@media (max-width: 600px) {
  .top {
    padding-top: 14px;
    padding-bottom: 8px;
  }

  .sub {
    font-size: 0.9rem;
  }
}