/* ── Snake ──
   The board is a square canvas sized by snake.js to fit the card and the
   viewport. Colours below are read by the script. */

/* ── Palette (dark is the site default) ── */
.sn-game {
  --sn-bg: #0d1220;
  --sn-tile: #111829;
  --sn-body: #5b8def;
  --sn-head: #8fb4ff;
  --sn-eye: #0b0e14;
  --sn-food: #f7768e;
  --sn-dead: #6b7185;
}

[data-theme="light"] .sn-game {
  --sn-bg: #e6e8eb;
  --sn-tile: #dde0e4;
  --sn-body: #3b6cc2;
  --sn-head: #2a57a8;
  --sn-eye: #ffffff;
  --sn-food: #d6343f;
  --sn-dead: #8a8d96;
}

/* ── Card, controls and HUD ── */
.game-card.sn-card {
  max-width: 36rem;
  margin: 0 auto;
  opacity: 1;
  transform: none;
}

.sn-controls {
  justify-content: center;
}

.sn-hud {
  display: flex;
  justify-content: space-between;
  max-width: 520px;
  margin: 0 auto 0.5rem;
  font-variant-numeric: tabular-nums;
}

/* ── Board ── */
.sn-wrap {
  display: flex;
  justify-content: center;
}

.sn-stage {
  position: relative;
  line-height: 0;
  border-radius: 8px;
  box-shadow:
    0 0 0 1px var(--card-border),
    0 10px 30px rgba(0, 0, 0, 0.35);
}

[data-theme="light"] .sn-stage {
  box-shadow:
    0 0 0 1px var(--btn-border),
    0 8px 24px rgba(0, 0, 0, 0.12);
}

/* Solid walls get a solid frame; wrap-around a dashed one */
.sn-game[data-walls="walls"] .sn-stage {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sn-game[data-walls="wrap"] .sn-stage {
  outline: 2px dashed var(--muted);
  outline-offset: 2px;
}

.sn-stage canvas {
  display: block;
  border-radius: 8px;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

.sn-stage canvas:focus {
  outline: none;
}

.sn-stage:has(canvas:focus-visible) {
  outline-color: var(--accent-bright);
  outline-style: solid;
}

.sn-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 1rem;
  line-height: 1.4;
  text-align: center;
  border-radius: 8px;
  background: rgba(10, 14, 23, 0.7);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  color: #e6e6eb;
}

[data-theme="light"] .sn-overlay {
  background: rgba(230, 232, 235, 0.8);
  color: var(--fg);
}

.sn-overlay[hidden] {
  display: none;
}

.sn-overlay-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
}

.sn-overlay-msg {
  margin: 0;
  font-size: 0.85rem;
  opacity: 0.85;
}

.sn-overlay-btn {
  margin-top: 0.3rem;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1.4rem;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
}

.sn-overlay-btn:hover {
  filter: brightness(1.1);
}

.sn-overlay-btn:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

/* ── D-pad (touch screens only) ── */
.sn-pad {
  display: none;
  grid-template-columns: repeat(3, 3.6rem);
  grid-template-rows: repeat(2, 3.2rem);
  grid-template-areas:
    ".    up   ."
    "left down right";
  gap: 0.45rem;
  justify-content: center;
  margin-top: 1rem;
}

@media (pointer: coarse) {
  .sn-pad { display: grid; }
}

.sn-up    { grid-area: up; }
.sn-left  { grid-area: left; }
.sn-down  { grid-area: down; }
.sn-right { grid-area: right; }

.sn-pad button {
  font: inherit;
  font-size: 1.3rem;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid var(--card-border);
  background: var(--btn-bg);
  color: var(--fg);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

[data-theme="light"] .sn-pad button {
  border-color: var(--btn-border);
}

.sn-pad button:active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

/* ── Status and help ── */
/* Announced to screen readers; the overlay shows the same thing */
.sn-status {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.sn-help {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
  text-align: center;
}

.sn-help-touch {
  display: none;
}

@media (pointer: coarse) {
  .sn-help-keys { display: none; }
  .sn-help-touch { display: inline; }
}

.sn-help kbd {
  display: inline-block;
  min-width: 1.5em;
  padding: 0 0.3em;
  font-family: inherit;
  font-size: 0.72rem;
  line-height: 1.5;
  text-align: center;
  border-radius: 4px;
  border: 1px solid var(--card-border);
  background: var(--btn-bg);
  color: var(--fg);
}

[data-theme="light"] .sn-help kbd {
  border-color: var(--btn-border);
}