/* Two themes share one layout. Tokens change per [data-theme]. */
:root,
:root[data-theme="modern"] {
  --bg: #070a17;
  --bg-glow: radial-gradient(1200px 600px at 20% -10%, #1d2a6b55, transparent 60%),
             radial-gradient(900px 500px at 110% 10%, #5b2a8a44, transparent 60%);
  --surface: #11162c;
  --surface-2: #171e3b;
  --border: #ffffff14;
  --text: #e8ecff;
  --muted: #9aa3c7;
  --accent: #7cf2ff;
  --accent-2: #8f7cff;
  --radius: 16px;
  --font: "Space Grotesk", system-ui, sans-serif;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --title-size: clamp(2rem, 5vw, 3rem);
  --shadow: 0 20px 60px #0008;
  color-scheme: dark;
}

:root[data-theme="retro"] {
  --bg: #1d2116;
  --bg-glow: none;
  --surface: #c3cf9b;
  --surface-2: #b7c48f;
  --border: #2c3a23;
  --text: #2c3a23;
  --muted: #4c5c3c;
  --accent: #2c3a23;
  --accent-2: #2c3a23;
  --radius: 0px;
  --font: "Press Start 2P", ui-monospace, monospace;
  --font-display: "Press Start 2P", ui-monospace, monospace;
  --title-size: clamp(1.1rem, 3.5vw, 1.6rem);
  --shadow: none;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-glow), var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Retro: the whole page sits inside a phone-style LCD panel. */
:root[data-theme="retro"] body {
  background: var(--bg);
  padding: 16px;
}
:root[data-theme="retro"] .topbar,
:root[data-theme="retro"] main {
  background: var(--surface);
  max-width: 760px;
  margin-inline: auto;
}
:root[data-theme="retro"] .topbar {
  border: 4px solid #0e120a;
  border-bottom: none;
}
:root[data-theme="retro"] main {
  border: 4px solid #0e120a;
  border-top: 4px dashed var(--border);
  min-height: calc(100vh - 32px - 72px);
}

[hidden] { display: none !important; }

a { color: inherit; }

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px clamp(16px, 4vw, 32px);
  max-width: 1080px;
  margin: 0 auto;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  letter-spacing: -0.01em;
}
:root[data-theme="retro"] .logo { font-size: 0.75rem; }

.logo-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 18px #7cf2ff66;
}
:root[data-theme="retro"] .logo-mark {
  border-radius: 0;
  box-shadow: none;
  background:
    linear-gradient(var(--text) 0 0) 0 0 / 8px 8px no-repeat,
    linear-gradient(var(--text) 0 0) 14px 0 / 8px 8px no-repeat,
    linear-gradient(var(--text) 0 0) 7px 14px / 8px 8px no-repeat;
}

.theme-toggle {
  display: inline-flex;
  padding: 4px;
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}
.theme-toggle .opt { padding: 6px 14px; border-radius: 999px; }
:root[data-theme="modern"] .opt-modern,
:root[data-theme="retro"] .opt-retro {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #070a17;
  font-weight: 700;
}
:root[data-theme="retro"] .theme-toggle {
  border: 3px solid var(--border);
  border-radius: 0;
  background: var(--surface-2);
  font-size: 0.6rem;
}
:root[data-theme="retro"] .theme-toggle .opt { border-radius: 0; }
:root[data-theme="retro"] .opt-retro { background: var(--text); color: var(--surface); }
.theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- views ---------- */
main { padding: 0 clamp(16px, 4vw, 32px) 48px; max-width: 1080px; margin: 0 auto; }
.view { padding-top: clamp(16px, 4vw, 40px); }

.headline {
  font-family: var(--font-display);
  font-size: var(--title-size);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 8px;
}
:root[data-theme="retro"] .headline { letter-spacing: 0; line-height: 1.5; }

.sub { color: var(--muted); margin: 0 0 32px; }
:root[data-theme="retro"] .sub { font-size: 0.6rem; line-height: 2; }

/* ---------- menu cards ---------- */
.game-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.card:hover, .card:focus-visible {
  transform: translateY(-3px);
  border-color: #7cf2ff55;
  box-shadow: var(--shadow), 0 0 0 1px #7cf2ff33;
  outline: none;
}
:root[data-theme="retro"] .card { border: 3px solid var(--border); background: var(--surface-2); }
:root[data-theme="retro"] .card:hover,
:root[data-theme="retro"] .card:focus-visible { transform: none; box-shadow: 6px 6px 0 var(--border); }

.card-body { display: flex; flex-direction: column; gap: 6px; padding: 18px 20px 20px; }
.card-title { font-family: var(--font-display); font-weight: 700; font-size: 1.3rem; }
.card-blurb { color: var(--muted); font-size: 0.95rem; }
.card-best { margin-top: 8px; font-size: 0.85rem; color: var(--muted); }
.card-best b { color: var(--accent); }
:root[data-theme="retro"] .card-title { font-size: 0.85rem; }
:root[data-theme="retro"] .card-blurb,
:root[data-theme="retro"] .card-best { font-size: 0.55rem; line-height: 2; }
:root[data-theme="retro"] .card-best b { color: var(--text); }

/* Little CSS-drawn previews. */
.card-art { display: block; aspect-ratio: 16 / 7; position: relative; background: #0b1020; }
.card-art::before, .card-art::after { content: ""; position: absolute; }

.art-snake::before { /* snake body */
  left: 18%; top: 42%; width: 46%; height: 16%;
  border-radius: 999px;
  background: linear-gradient(90deg, #1f8fa3, #8affc1);
  box-shadow: 0 0 20px #8affc155;
}
.art-snake::after { /* food */
  left: 76%; top: 44%; width: 12px; height: 12px; border-radius: 50%;
  background: #ff4f7b; box-shadow: 0 0 16px #ff4f7b;
}

.art-bricks {
  background:
    linear-gradient(#ff5d8f 0 0) 8% 18% / 18% 12% no-repeat,
    linear-gradient(#ffc857 0 0) 30% 18% / 18% 12% no-repeat,
    linear-gradient(#4dd4ac 0 0) 52% 18% / 18% 12% no-repeat,
    linear-gradient(#8f7cff 0 0) 74% 18% / 18% 12% no-repeat,
    linear-gradient(#ff8a5b 0 0) 19% 36% / 18% 12% no-repeat,
    linear-gradient(#4cc9f0 0 0) 63% 36% / 18% 12% no-repeat,
    linear-gradient(180deg, #141838, #090c1c);
}
.art-bricks::before { /* ball */
  left: 48%; top: 56%; width: 12px; height: 12px; border-radius: 50%;
  background: #fff; box-shadow: 0 0 14px #bde7ff;
}
.art-bricks::after { /* paddle */
  left: 38%; bottom: 12%; width: 24%; height: 8px; border-radius: 6px;
  background: linear-gradient(90deg, #7cf2ff, #8f7cff); box-shadow: 0 0 14px #7cc8ff;
}

:root[data-theme="retro"] .card-art {
  background: var(--surface);
  border-bottom: 3px solid var(--border);
}
:root[data-theme="retro"] .art-snake::before {
  border-radius: 0; box-shadow: none; height: 14%;
  background: repeating-linear-gradient(90deg, var(--text) 0 14px, var(--surface) 14px 16px);
}
:root[data-theme="retro"] .art-snake::after { border-radius: 0; box-shadow: none; background: var(--text); }
:root[data-theme="retro"] .art-bricks {
  background:
    repeating-linear-gradient(90deg, var(--text) 0 36px, transparent 36px 40px) 8px 14px / calc(100% - 16px) 14px no-repeat,
    repeating-linear-gradient(90deg, var(--text) 0 36px, transparent 36px 40px) 8px 34px / calc(100% - 16px) 14px no-repeat,
    var(--surface);
}
:root[data-theme="retro"] .art-bricks::before,
:root[data-theme="retro"] .art-bricks::after { border-radius: 0; box-shadow: none; background: var(--text); }

.art-mahjong {
  background:
    linear-gradient(#fbf7ec 0 0) 30% 30% / 11% 38% no-repeat,
    linear-gradient(#d9c9a0 0 0) calc(30% + 4px) calc(30% + 4px) / 11% 38% no-repeat,
    linear-gradient(#fbf7ec 0 0) 44.5% 30% / 11% 38% no-repeat,
    linear-gradient(#d9c9a0 0 0) calc(44.5% + 4px) calc(30% + 4px) / 11% 38% no-repeat,
    linear-gradient(#fbf7ec 0 0) 59% 30% / 11% 38% no-repeat,
    linear-gradient(#d9c9a0 0 0) calc(59% + 4px) calc(30% + 4px) / 11% 38% no-repeat,
    linear-gradient(180deg, #123236, #081619);
}
.art-mahjong::before { /* red centre mark on the middle tile */
  left: calc(50% - 7px); top: calc(49% - 7px); width: 14px; height: 14px; border-radius: 50%;
  border: 4px solid #d33a3a; box-sizing: border-box;
}
.art-mahjong::after { /* selected tile glow */
  left: 59%; top: 30%; width: 11%; height: 38%; border-radius: 3px;
  box-shadow: 0 0 0 2px #1aa6d9, 0 0 16px #1aa6d9aa;
}
:root[data-theme="retro"] .art-mahjong {
  background:
    linear-gradient(var(--text) 0 0) calc(30% + 4px) calc(30% + 4px) / 11% 38% no-repeat,
    linear-gradient(var(--text) 0 0) calc(44.5% + 4px) calc(30% + 4px) / 11% 38% no-repeat,
    linear-gradient(var(--text) 0 0) calc(59% + 4px) calc(30% + 4px) / 11% 38% no-repeat,
    linear-gradient(var(--surface-2) 0 0) 30% 30% / 11% 38% no-repeat,
    linear-gradient(var(--surface-2) 0 0) 44.5% 30% / 11% 38% no-repeat,
    linear-gradient(var(--surface-2) 0 0) 59% 30% / 11% 38% no-repeat,
    var(--surface);
}
:root[data-theme="retro"] .art-mahjong::before { border-radius: 0; border-color: var(--text); }
:root[data-theme="retro"] .art-mahjong::after { border-radius: 0; box-shadow: 0 0 0 3px var(--text); }

/* ---------- play view ---------- */
.hud {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.back {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
}
.back:hover { color: var(--text); }
.game-title { margin: 0; font-family: var(--font-display); font-size: 1.4rem; flex: 1; }
.scores { display: flex; gap: 10px; }
.score {
  display: flex; flex-direction: column; align-items: flex-end;
  min-width: 84px; padding: 6px 14px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
}
.score span { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.score b { font-size: 1.25rem; font-variant-numeric: tabular-nums; }

:root[data-theme="retro"] .back { border: 3px solid var(--border); border-radius: 0; font-size: 0.55rem; color: var(--text); }
:root[data-theme="retro"] .game-title { font-size: 0.8rem; }
:root[data-theme="retro"] .score { border: 3px solid var(--border); border-radius: 0; background: var(--surface-2); }
:root[data-theme="retro"] .score span { font-size: 0.45rem; color: var(--text); }
:root[data-theme="retro"] .score b { font-size: 0.75rem; margin-top: 4px; }

.stage {
  position: relative;
  /* Fit the canvas inside the viewport whatever its aspect ratio. */
  width: min(100%, calc((100vh - 300px) * var(--aspect, 1)));
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.stage canvas { display: block; width: 100%; height: auto; }

:root[data-theme="retro"] .stage {
  border: 6px solid #0e120a;
  box-shadow: 0 0 0 3px var(--border);
}
:root[data-theme="retro"] .stage canvas { image-rendering: pixelated; }
/* Faint LCD scan lines in retro mode. */
:root[data-theme="retro"] .stage::after {
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, #00000010 0 1px, transparent 1px 3px);
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px;
  text-align: center;
  background: #070a17a6;
  backdrop-filter: blur(4px);
  z-index: 1;
}
.overlay-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.overlay-sub { margin: 0; color: var(--text); opacity: 0.85; }

:root[data-theme="retro"] .overlay { background: #c3cf9bd9; backdrop-filter: none; }
:root[data-theme="retro"] .overlay-title { font-size: clamp(0.9rem, 3vw, 1.2rem); background: none; color: var(--text); }
:root[data-theme="retro"] .overlay-sub { font-size: 0.55rem; line-height: 2; }

.stage canvas.pointer { cursor: pointer; touch-action: none; }
.overlay { cursor: pointer; }

.actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.actions:empty { display: none; }
.action {
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 16px;
  cursor: pointer;
}
.action:hover { border-color: #7cf2ff55; }
:root[data-theme="retro"] .action {
  border: 3px solid var(--border);
  border-radius: 0;
  background: var(--surface-2);
  font-size: 0.55rem;
}
:root[data-theme="retro"] .action:active { background: var(--text); color: var(--surface); }

.help { text-align: center; color: var(--muted); font-size: 0.9rem; margin-top: 14px; }
:root[data-theme="retro"] .help { font-size: 0.55rem; }

@media (max-width: 520px) {
  .game-title { flex-basis: 100%; order: -1; }
  .scores { margin-left: auto; }
}

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