:root {
  --bg: #fdc114;
  --fg: #ffffff;
  --muted: rgba(255, 255, 255, 0.85);
  --rule: rgba(255, 255, 255, 0.5);
  --code-bg: rgba(0, 0, 0, 0.15);
  --btn-bg: rgba(0, 0, 0, 0.12);
  --btn-bg-strong: rgba(0, 0, 0, 0.25);
  --btn-border: rgba(255, 255, 255, 0.6);
  --accent: #ffffff;
  --accent-2: #2b0a00;
  --error: #2b0a00;

  --font: 'VT323', monospace;
  --base-size: 22px;
  --line-height: 1.4;
  --measure: 720px;
}

[data-theme="dark"] {
  --bg: #111111;
  --fg: #e8e8e8;
  --muted: rgba(232, 232, 232, 0.7);
  --rule: rgba(232, 232, 232, 0.25);
  --code-bg: rgba(255, 255, 255, 0.08);
  --btn-bg: rgba(255, 255, 255, 0.06);
  --btn-bg-strong: rgba(255, 255, 255, 0.14);
  --btn-border: rgba(232, 232, 232, 0.4);
  --accent: #fdc114;
  --accent-2: #ffffff;
  --error: #ffb4a4;
}

[data-theme="sepia"] {
  --bg: #f4ecd8;
  --fg: #5b4636;
  --muted: rgba(91, 70, 54, 0.75);
  --rule: rgba(91, 70, 54, 0.3);
  --code-bg: rgba(91, 70, 54, 0.12);
  --btn-bg: rgba(91, 70, 54, 0.08);
  --btn-bg-strong: rgba(91, 70, 54, 0.18);
  --btn-border: rgba(91, 70, 54, 0.4);
  --accent: #b07b3a;
  --accent-2: #5b4636;
  --error: #8a2a14;
}

[data-font="serif"]      { --font: 'Lora', Georgia, serif; --base-size: 18px; --line-height: 1.6; }
[data-font="plex-serif"] { --font: 'IBM Plex Serif', Georgia, serif; --base-size: 18px; --line-height: 1.6; }
[data-font="sans"]       { --font: 'Inter', system-ui, sans-serif; --base-size: 17px; --line-height: 1.55; }
[data-font="ubuntu"]     { --font: 'Ubuntu', system-ui, sans-serif; --base-size: 17px; --line-height: 1.55; }
[data-font="atkinson"]   { --font: 'Atkinson Hyperlegible', system-ui, sans-serif; --base-size: 17px; --line-height: 1.55; }

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  margin: 0;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.page {
  max-width: var(--measure);
  margin: 40px auto;
  padding: 0 24px;
  font-size: var(--base-size);
  line-height: var(--line-height);
}

.page-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.page-header h1 {
  font-weight: normal;
  font-size: 2.2em;
  margin: 8px 0 16px;
  flex: 1 1 auto;
  line-height: 1.1;
}

.back-link {
  color: var(--fg);
  text-decoration: none;
  font-size: 0.9em;
  opacity: 0.85;
}
.back-link:hover { opacity: 1; }

.reader-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
  font-size: 0.85em;
}

.seg {
  display: inline-flex;
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  overflow: hidden;
}

.seg button {
  font-family: inherit;
  font-size: inherit;
  background: transparent;
  color: var(--fg);
  border: 0;
  padding: 4px 10px;
  cursor: pointer;
  line-height: 1.2;
}

.seg button + button { border-left: 1px solid var(--btn-border); }
.seg button.active, .seg button:hover { background: var(--btn-bg); }

/* ---------- arcade landing ---------- */

.cabinet-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.cabinet {
  display: block;
  padding: 18px 16px;
  border: 1px solid var(--btn-border);
  border-radius: 6px;
  background: var(--btn-bg);
  color: var(--fg);
  text-decoration: none;
  text-align: center;
  transition: transform 0.15s ease, background-color 0.2s ease;
}

.cabinet:hover {
  transform: translateY(-2px);
  background: var(--btn-bg-strong);
}

.cabinet.coming {
  opacity: 0.45;
  pointer-events: none;
}

.cabinet .cab-glyph {
  display: block;
  font-size: 2.4em;
  line-height: 1;
  margin-bottom: 6px;
}

.cabinet .cab-name {
  display: block;
  font-size: 1.1em;
  margin-bottom: 4px;
}

.cabinet .cab-hi {
  display: block;
  font-size: 0.75em;
  opacity: 0.75;
}

.cabinet .cab-tag {
  font-size: 0.7em;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.6;
}

@media (max-width: 700px) {
  .cabinet-grid { grid-template-columns: repeat(2, 1fr); }
  .page-header h1 { font-size: 1.7em; }
}

/* ---------- per-game shell ---------- */

.game-shell {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0 0 16px;
}

.game-status {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: center;
  align-items: baseline;
  margin: 0 0 10px;
  font-size: 1em;
}

.game-status .stat-label {
  opacity: 0.7;
  font-size: 0.78em;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-right: 6px;
}

.game-canvas {
  display: block;
  background: var(--btn-bg);
  border: 2px solid var(--btn-border);
  border-radius: 4px;
  max-width: 100%;
  image-rendering: pixelated;
  touch-action: none;
}

.game-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 12px 0 0;
}

.game-help {
  text-align: center;
  font-size: 0.8em;
  opacity: 0.7;
  margin: 8px 0 0;
}

.btn {
  font-family: inherit;
  font-size: 1em;
  background: var(--btn-bg);
  color: var(--fg);
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  padding: 6px 14px;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn.primary { background: var(--btn-bg-strong); }
.btn:hover:not(:disabled) { background: var(--btn-bg-strong); }
.btn:disabled { opacity: 0.5; cursor: default; }

.field {
  display: block;
  margin: 0 0 14px;
}

.field label {
  display: block;
  font-size: 0.85em;
  opacity: 0.85;
  margin: 0 0 4px;
}

.field select,
.field input[type="number"] {
  font-family: inherit;
  font-size: 1em;
  background: var(--btn-bg);
  color: var(--fg);
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  padding: 4px 8px;
}

/* ---------- 2048 board ---------- */

.t2048-board {
  --t2048-tile: min(86px, calc((100vw - 98px) / 4));
  display: grid;
  grid-template-columns: repeat(4, var(--t2048-tile));
  grid-template-rows: repeat(4, var(--t2048-tile));
  gap: 10px;
  padding: 10px;
  background: var(--btn-bg-strong);
  border-radius: 6px;
  touch-action: none;
}

.t2048-cell, .t2048-tile {
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: calc(var(--t2048-tile) * 0.4);
}

.t2048-cell { background: var(--btn-bg); }

.t2048-tile {
  background: #eee4da;
  color: #2b0a00;
}

.t2048-tile.v2    { background: #eee4da; color: #2b0a00; }
.t2048-tile.v4    { background: #ffd97d; color: #2b0a00; }
.t2048-tile.v8    { background: #ffb84d; color: #2b0a00; }
.t2048-tile.v16   { background: #ff8c42; color: #ffffff; }
.t2048-tile.v32   { background: #ff5e3a; color: #ffffff; }
.t2048-tile.v64   { background: #e63946; color: #ffffff; }
.t2048-tile.v128  { background: #d62828; color: #ffffff; font-size: calc(var(--t2048-tile) * 0.34); }
.t2048-tile.v256  { background: #9d0208; color: #ffffff; font-size: calc(var(--t2048-tile) * 0.34); }
.t2048-tile.v512  { background: #6a040f; color: #ffffff; font-size: calc(var(--t2048-tile) * 0.34); }
.t2048-tile.v1024 { background: #370617; color: #ffe66d; font-size: calc(var(--t2048-tile) * 0.28); }
.t2048-tile.v2048 { background: #03071e; color: #ffd60a; font-size: calc(var(--t2048-tile) * 0.28); }

.t2048-tile.spawn { animation: t2048-spawn 0.18s ease-out; }
.t2048-tile.merge { animation: t2048-merge 0.16s ease-in-out; }

@keyframes t2048-spawn {
  0%   { transform: scale(0); opacity: 0; }
  60%  { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(1); }
}

@keyframes t2048-merge {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.18); }
  100% { transform: scale(1); }
}

@media (max-width: 380px) {
  .t2048-board {
    --t2048-tile: min(86px, calc((100vw - 78px) / 4));
    gap: 6px;
    padding: 6px;
  }
}

/* ---------- footer ---------- */

.site-footer {
  max-width: var(--measure);
  margin: 24px auto 30px;
  padding: 16px 24px 0;
  border-top: 1px dashed var(--rule);
  text-align: center;
  font-size: 0.8em;
  color: var(--muted);
}

.site-footer a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-style: dotted;
}

.site-footer a:hover { text-decoration-style: solid; }