/* Slate surfaces, one indigo accent, dark theme by default. */

html { color-scheme: light; }
html.dark { color-scheme: dark; }

[hidden] { display: none !important; }

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Inter var", Inter, "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 16px;
  box-sizing: border-box;
  background: #f6f7fb;
  background-image:
    radial-gradient(at 12% 18%, rgba(99, 102, 241, 0.10) 0, transparent 45%),
    radial-gradient(at 88% 12%, rgba(236, 72, 153, 0.06) 0, transparent 50%);
  color: #0f172a;
}

html.dark body {
  background: #0a0a0f;
  color: #e2e8f0;
  background-image:
    radial-gradient(at 12% 18%, rgba(99, 102, 241, 0.12) 0, transparent 45%),
    radial-gradient(at 88% 12%, rgba(236, 72, 153, 0.08) 0, transparent 50%),
    radial-gradient(at 50% 92%, rgba(34, 211, 238, 0.10) 0, transparent 45%);
}

body.game { user-select: none; }

a { color: inherit; }

.card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  padding: 1rem;
}
html.dark .card { background: #0f172a; border-color: #1e293b; }

/* Header bar */
.bar {
  width: min(92vw, var(--bar-width, 540px));
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.bar-wide { --bar-width: 660px; }
.actions { display: flex; gap: 8px; }
.bar-home { --bar-width: 780px; }
.bar .title { display: flex; align-items: center; gap: 10px; }
h1 { margin: 0; font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; }

.stats { display: flex; gap: 8px; }
.stat-tile {
  min-width: 62px;
  padding: 6px 10px;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  background: #fff;
}
html.dark .stat-tile { background: #0f172a; border-color: #1e293b; }
.stat-tile .label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #64748b;
}
.stat-tile .value { font-size: 1.15rem; font-variant-numeric: tabular-nums; font-weight: 600; }

.icon-btn {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  background: transparent;
  color: inherit;
  cursor: pointer;
  text-decoration: none;
}
html.dark .icon-btn { border-color: #334155; }
.icon-btn:hover { background: rgba(99, 102, 241, 0.08); }

:focus-visible { outline: 2px solid #6366f1; outline-offset: 2px; }

/* Option rows (speed, apples, mode...) */
.options {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 18px;
  max-width: min(92vw, 760px);
}
.levels { display: flex; align-items: center; gap: 10px; font-size: 0.8rem; color: #64748b; }
.seg {
  display: inline-flex;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  overflow: hidden;
}
html.dark .seg { border-color: #334155; }
.seg button {
  padding: 6px 14px;
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}
.seg button + button { border-left: 1px solid #e2e8f0; }
html.dark .seg button + button { border-left-color: #334155; }
.seg button.active { background: #4f46e5; color: #fff; }
.seg button:disabled { cursor: not-allowed; opacity: 0.5; }
.seg button.active:disabled { opacity: 1; }

/* Game board */
.board { position: relative; padding: 8px; touch-action: none; }
.screen { display: block; height: auto; border-radius: 0.375rem; }
/* Initial size before fitCanvas() measures the page and sets the exact width. */
.screen-snake { width: min(92vw, 520px, calc(100dvh - 300px)); aspect-ratio: 1 / 1; }
.screen-pacman { width: min(92vw, 560px, calc((100dvh - 230px) * 28 / 31)); aspect-ratio: 28 / 31; }
.screen-car { width: min(92vw, 420px, calc((100dvh - 290px) * 420 / 640)); aspect-ratio: 420 / 640; }
.screen-casse { width: min(92vw, 440px, calc(100dvh - 300px)); aspect-ratio: 1 / 1; }

.overlay {
  position: absolute;
  inset: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 24px;
  border-radius: 0.375rem;
  background: rgba(15, 23, 42, 0.78);
  color: #f8fafc;
  text-align: center;
}
.overlay h2 { margin: 0; font-size: 1.6rem; }
.overlay p { margin: 0; font-size: 0.95rem; color: #cbd5e1; max-width: 380px; }
.overlay button {
  margin-top: 6px;
  padding: 10px 22px;
  border: 0;
  border-radius: 0.5rem;
  background: #4f46e5;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
.overlay button:hover { background: #4338ca; }

.help { margin: 0; font-size: 0.8rem; color: #64748b; text-align: center; max-width: 520px; line-height: 1.7; }
kbd {
  font-family: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 0.75rem;
  padding: 1px 6px;
  border: 1px solid #cbd5e1;
  border-radius: 4px;
}
html.dark kbd { border-color: #334155; }

.nitro-btn {
  position: absolute;
  right: 20px;
  bottom: 20px;
  display: none;
  width: 76px;
  height: 76px;
  border: 2px solid #38bdf8;
  border-radius: 50%;
  background: rgba(14, 116, 144, 0.55);
  color: #f8fafc;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  touch-action: none;
}
.nitro-btn:active { background: rgba(56, 189, 248, 0.75); }
.board[data-state="running"] .nitro-btn { display: none; }

.help-touch { display: none; }
@media (pointer: coarse) {
  .help-keys { display: none; }
  .help-touch { display: block; }
  .board[data-state="running"] .nitro-btn { display: block; }
}

/* Phones: tighter spacing so the board keeps as much height as possible. */
@media (max-width: 480px) {
  body { padding: 10px; gap: 8px; }
  .stats { gap: 6px; }
  .stat-tile { min-width: 0; padding: 4px 8px; }
  .stat-tile .label { letter-spacing: 0.04em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .stat-tile .value { font-size: 1rem; }
  .options { gap: 6px 12px; }
  .levels { gap: 6px; }
  .seg button { padding: 5px 10px; font-size: 0.8rem; }
  .help { font-size: 0.75rem; line-height: 1.5; }
  .credit { margin-top: 0; }
  .nitro-btn { width: 58px; height: 58px; right: 14px; bottom: 16px; font-size: 0.68rem; background: rgba(14, 116, 144, 0.35); }
}

/* Smallest phones: the option buttons explain themselves, the row labels give way to the board. */
@media (max-width: 380px) {
  .levels > span { display: none; }
  .seg button { padding: 5px 8px; font-size: 0.78rem; }
}

@media (max-width: 640px) {
  .bar .title { order: 0; }
  .bar .actions { order: 1; margin-left: auto; }
  .bar .stats { order: 2; width: 100%; }
  .bar .stat-tile { flex: 1; }
}

.credit {
  margin: 4px 0 0;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  background: linear-gradient(90deg, #818cf8, #ec4899, #22d3ee);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Home page */
.intro { margin: 0; color: #64748b; font-size: 0.95rem; text-align: center; }
/* One column on a phone, 2 x 2 from tablet width, four across on a wide screen, so the
   four cards always fill their last row. */
.games {
  width: min(92vw, 780px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 560px) {
  .games { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1180px) {
  .games { width: min(92vw, 1180px); grid-template-columns: repeat(4, 1fr); }
  .bar-home { --bar-width: 1180px; }
}
.game-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.game-card:hover { transform: translateY(-2px); border-color: #6366f1; }
.game-card svg { width: 100%; height: auto; border-radius: 0.375rem; }
.game-card h2 { margin: 0; font-size: 1.05rem; }
.game-card p { margin: 0; font-size: 0.85rem; color: #64748b; }
.game-card .play { margin-top: auto; font-size: 0.85rem; font-weight: 600; color: #4f46e5; }

/* 404 page */
.lost {
  box-sizing: border-box;
  width: min(92vw, 420px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}
.lost svg { width: 100%; height: auto; }
.lost p { margin: 0; color: #64748b; }
html.dark .lost p { color: #94a3b8; }
.lost .play { font-weight: 600; color: #4f46e5; text-decoration: none; }
html.dark .lost .play { color: #a5b4fc; }

/* Muted text on dark surfaces: slate-500 falls under WCAG AA 4.5:1 there, slate-400 clears it. */
html.dark .stat-tile .label,
html.dark .levels,
html.dark .help,
html.dark .intro,
html.dark .game-card p { color: #94a3b8; }
html.dark .game-card .play { color: #a5b4fc; }
html.dark .game-card:hover { border-color: #818cf8; }

@media (prefers-reduced-motion: reduce) {
  .game-card { transition: none; }
  .game-card:hover { transform: none; }
}