/* Snake AI lab page. Page chrome uses the site's look tokens (themes.css);
   the game board keeps its own dark neon palette in every look. */

.page-lab .page-head { padding-bottom: 1rem; }
.snake-lab {
  display: grid; grid-template-columns: minmax(0, 1fr) 19rem; gap: 1.5rem 2rem;
  align-items: start; padding-bottom: 2.5rem;
}

/* ---------- control bar ---------- */
.snake-controls { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 0.6rem 1rem; margin-bottom: 0.9rem; }
.snake-modes, .snake-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem; }
.snake-btn {
  cursor: pointer; font: inherit; font-size: 0.92rem; font-weight: 600; line-height: 1.2;
  min-height: 2.5rem; padding: 0.45rem 0.85rem;
  border-radius: var(--button-radius, 6px); border: 1px solid var(--line-strong, var(--line));
  background: var(--panel); color: var(--fg);
}
.snake-btn:hover { border-color: var(--accent); }
.snake-btn[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--button-fg, #fff); }
.snake-btn-quiet { background: transparent; font-weight: 500; }
.snake-btn-solid { background: var(--button-bg, var(--accent)); border-color: var(--button-bg, var(--accent)); color: var(--button-fg, #fff); }
#snake-pause[aria-pressed="true"]::before { content: "▶ "; content: "▶ " / ""; }
.snake-speed { display: inline-flex; align-items: center; gap: 0.5rem; margin-right: 0.3rem; font-size: 0.92rem; color: var(--muted); }
.snake-speed input { width: 7rem; accent-color: var(--accent); }
.snake-speed output { min-width: 2.2em; color: var(--fg); font-weight: 600; font-variant-numeric: tabular-nums; }

/* ---------- board ---------- */
.snake-board {
  --board-pad: clamp(6px, 1.2vw, 12px);
  position: relative; padding: var(--board-pad); background: #0b1122;
  border: 1px solid var(--line-strong, var(--line)); border-radius: var(--card-radius, 10px);
  box-shadow: 0 18px 40px -24px rgb(0 0 0 / 0.55);
}
.snake-stage {
  position: relative; cursor: pointer; touch-action: none;
  -webkit-user-select: none; user-select: none; -webkit-tap-highlight-color: transparent;
  border-radius: max(0px, calc(var(--card-radius, 10px) - 4px));
}
.snake-stage:focus-visible { outline: 3px solid var(--focus, var(--accent)); outline-offset: calc(var(--board-pad) + 4px); }
.snake-stage > canvas:not(.snake-glow) { display: block; width: 100%; height: auto; aspect-ratio: 616 / 440; border-radius: inherit; }
/* a blurred, screen-blended copy of the board: the neon bloom (blur runs on the GPU compositor) */
.snake-glow {
  position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; border-radius: inherit;
  filter: blur(9px) saturate(1.75) brightness(1.35); mix-blend-mode: screen; opacity: 0.9;
}
.snake-glow[hidden] { display: none; }
.snake-win {
  position: absolute; left: 50%; top: 56%; transform: translateX(-50%); z-index: 2;
  max-width: calc(100% - 2rem); padding: 1rem 1.5rem; text-align: center;
  background: rgb(10 16 30 / 0.94); border: 1px solid rgb(78 204 163 / 0.5); border-radius: 14px;
  box-shadow: 0 8px 40px rgb(78 204 163 / 0.25);
}
.snake-win[hidden] { display: none; }
.snake-win p { margin: 0 0 0.7rem; color: #4ecca3; font-weight: 700; }

/* ---------- under the board ---------- */
.snake-under { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 0.5rem 1rem; margin-top: 0.8rem; }
.snake-status { margin: 0; color: var(--muted); font-size: 0.95rem; }
.snake-fx { display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem; }
.snake-fx-label { margin-right: 0.2rem; color: var(--muted); font-size: 0.82rem; }
.snake-chip {
  cursor: pointer; font: inherit; font-size: 0.8rem; min-height: 2rem; padding: 0.25rem 0.6rem;
  border-radius: var(--chip-radius, 999px); border: 1px solid var(--line-strong, var(--line));
  background: transparent; color: var(--muted);
}
.snake-chip:hover { border-color: var(--accent); }
.snake-chip[aria-pressed="true"] { background: var(--chip-bg); border-color: var(--accent); color: var(--chip-fg, var(--fg)); }
.snake-chip[aria-pressed="true"]::before { content: "✓ "; content: "✓ " / ""; }

/* ---------- stats panel ---------- */
.snake-stats {
  background: var(--panel); border: var(--card-border, 1px solid var(--line)); border-radius: var(--card-radius, 10px);
  padding: 1.1rem 1.2rem 1.2rem;
}
.snake-stats-title { margin: 0 0 0.7rem; font-size: 1.05rem; }
.snake-group + .snake-group { margin-top: 1.3rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
.snake-dl { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.65rem 0.9rem; margin: 0; }
.snake-dl .snake-wide { grid-column: 1 / -1; }
.snake-dl dt { color: var(--muted); font-size: 0.8rem; }
.snake-dl dd {
  margin: 0.1rem 0 0; line-height: 1.1; font-size: 1.5rem; font-variant-numeric: tabular-nums;
  font-family: var(--font-display); font-weight: var(--display-weight, 600); font-variation-settings: var(--display-variation, normal);
  color: var(--stat-color, var(--accent-text, var(--accent)));
}
.snake-dl .snake-wide dd { font-size: 1.15rem; color: var(--fg); }
.snake-small { margin: 0.7rem 0 0; color: var(--muted); font-size: 0.85rem; line-height: 1.45; }
.snake-brain { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 1rem; }
.snake-btn-small { min-height: 2.25rem; padding: 0.35rem 0.7rem; font-size: 0.85rem; }
.snake-facts { margin-top: 0.9rem; padding-top: 0.7rem; border-top: 1px dashed var(--line); }
.snake-small:empty { display: none; }
.snake-chart { margin: 1rem 0 0; }
.snake-chart figcaption { margin-bottom: 0.35rem; font-size: 0.85rem; font-weight: 600; }
#snake-chart { display: block; width: 100%; height: 150px; touch-action: pan-y; }

/* ---------- arena ---------- */
.snake-arena[hidden], .snake-board[hidden] { display: none; }
.snake-arena-boards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.snake-arena-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.2rem 0.8rem; margin-bottom: 0.45rem; }
.snake-arena-name { margin: 0; font-size: 1.05rem; }
.snake-arena-stats { display: flex; gap: 0.9rem; margin: 0; }
.snake-arena-stats dt { color: var(--muted); font-size: 0.75rem; }
.snake-arena-stats dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; font-family: var(--font-display); color: var(--accent-text, var(--accent)); }
.snake-arena .snake-board { --board-pad: clamp(4px, 0.8vw, 8px); }
.snake-tally { margin: 0.8rem 0 0; font-family: var(--font-display); font-weight: var(--display-weight, 600); font-size: 1.15rem; }

/* ---------- league panel ---------- */
.snake-league-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.9rem; margin-bottom: 0.2rem; }
.snake-select { display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.88rem; color: var(--muted); }
.snake-select select {
  font: inherit; font-size: 0.88rem; color: var(--fg); background: var(--bg);
  border: 1px solid var(--line-strong, var(--line)); border-radius: var(--button-radius, 6px); padding: 0.3rem 0.5rem; min-height: 2.25rem;
}
.snake-legend { display: flex; gap: 1rem; margin: 0 0 0.4rem; padding: 0; list-style: none; font-size: 0.82rem; color: var(--muted); }
.snake-legend li { display: flex; align-items: center; gap: 0.4rem; margin: 0; }
.snake-key { display: inline-block; width: 1.4rem; height: 0; border-top: 2px solid var(--accent); }
.snake-key-dqn { border-top: 2px dashed var(--ok, var(--fg)); }
.snake-mini { display: block; width: 100%; height: 84px; margin-top: 0.2rem; }
.snake-genomes { margin-top: 1rem; font-size: 0.88rem; }
.snake-genomes summary { cursor: pointer; font-weight: 600; }
.snake-table { width: 100%; border-collapse: collapse; margin-top: 0.6rem; font-size: 0.82rem; font-variant-numeric: tabular-nums; }
.snake-table caption { text-align: left; font-weight: 600; padding-bottom: 0.25rem; }
.snake-table th, .snake-table td { text-align: left; padding: 0.22rem 0.3rem; border-bottom: 1px solid var(--line); }
.snake-table th { color: var(--muted); font-weight: 500; }
.snake-table td:last-child { text-align: right; }
#league-reset { margin-top: 0.9rem; }
#league-status { margin-bottom: 0.8rem; }

/* ---------- how it works ---------- */
.snake-how { padding-block: 0.5rem 3.5rem; }
.snake-how-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); gap: 1rem 2.5rem; }
.snake-how h3 { margin-bottom: 0.35rem; font-size: 1.1rem; }
.snake-how p { margin: 0; }

/* ---------- per-look touches ---------- */
[data-theme="ops"] .snake-stats { border-top: 3px solid var(--ok); }
[data-theme="ops"] .snake-dl dd, [data-theme="ops"] .snake-speed output { font-family: var(--font-display); }
[data-theme="editorial"] .snake-stats { background: #ffffff; box-shadow: 0 1px 0 var(--line); }
[data-theme="editorial"] .snake-btn, [data-theme="editorial"] .snake-chip, [data-theme="editorial"] .snake-speed { font-family: system-ui, sans-serif; }
[data-theme="print"] .snake-board, [data-theme="print"] .snake-stats { outline: 2px dashed var(--m); outline-offset: 5px; margin: 7px; }
[data-theme="print"] .snake-key-dqn { border-top-color: var(--c); }
[data-theme="print"] .snake-board { border: 2px solid #000; }
[data-theme="print"] .snake-btn[aria-pressed="true"] { background: #000; border-color: #000; color: #fff; }
[data-theme="print"] .snake-chip[aria-pressed="true"] { border-color: #000; }

/* ---------- responsive + accessibility ---------- */
@media (max-width: 1000px) {
  .snake-lab { grid-template-columns: minmax(0, 1fr); }
  .snake-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.2rem 2rem; }
  .snake-group + .snake-group { margin-top: 0; padding-top: 0; border-top: 0; }
}
@media (max-width: 760px) {
  .snake-arena-boards { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 700px) {
  .snake-stats { display: block; }
  .snake-group + .snake-group { margin-top: 1.3rem; padding-top: 1.1rem; border-top: 1px solid var(--line); }
  .snake-how-grid { grid-template-columns: 1fr; }
  .snake-controls { align-items: stretch; }
  .snake-modes .snake-btn { flex: 1 1 auto; }
  .snake-speed input { width: 6rem; }
}
@media (forced-colors: active) {
  .snake-btn[aria-pressed="true"], .snake-chip[aria-pressed="true"] { outline: 2px solid CanvasText; outline-offset: 1px; }
}