/* Game AI Visualizer — self-contained styles. Palette mirrors LK Forge. */
:root {
  --gv-bg: #f5f7ff;
  --gv-surface: #ffffff;
  --gv-surface2: #eef1fb;
  --gv-text: #0b1020;
  --gv-muted: #5a6178;
  --gv-accent: #0e7490;
  --gv-border: #dde2f2;
  --gv-green: #166534;
  --gv-blue: #0891b2;
  --gv-amber: #b45309;
  --gv-red: #991b1b;
  --gv-display: 'Orbitron', system-ui, sans-serif;
  --gv-body: 'Outfit', system-ui, -apple-system, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --gv-bg: #0b1020;
    --gv-surface: #151b30;
    --gv-surface2: #1b2340;
    --gv-text: #eef1fb;
    --gv-muted: #9aa3c0;
    --gv-accent: #22d3ee;
    --gv-border: #2a3358;
    --gv-green: #4ade80;
    --gv-amber: #fbbf24;
    --gv-red: #f87171;
  }
}
* { box-sizing: border-box; }
:focus-visible { outline: 3px solid var(--gv-accent); outline-offset: 2px; border-radius: 4px; }
.gv-body {
  margin: 0; background: var(--gv-bg); color: var(--gv-text);
  font-family: var(--gv-body); line-height: 1.6;
}
.gv-wrap { max-width: 880px; margin: 0 auto; padding: 1.25rem; }

/* header (tool page only) */
.gv-header { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.25rem; border-bottom: 1px solid var(--gv-border); background: var(--gv-surface); }
.gv-logo { font-family: var(--gv-display); font-weight: 900; color: var(--gv-text); text-decoration: none; letter-spacing: 0.02em; }
.gv-logo span { color: var(--gv-accent); }
.gv-nav a { color: var(--gv-muted); text-decoration: none; margin-left: 1.1rem; font-weight: 600; font-size: 0.9rem; }
.gv-nav a:hover { color: var(--gv-accent); }

.gv-eyebrow { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--gv-accent); }
h1.gv-h1 { font-family: var(--gv-display); font-size: clamp(1.6rem, 4.5vw, 2.6rem); font-weight: 900; line-height: 1.12; margin: 0.4rem 0 0.75rem; }
.gv-lead { color: var(--gv-muted); font-size: 1.02rem; margin: 0 0 1.5rem; }

/* tabs */
.gv-tabs { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.25rem; }
.gv-tab {
  font-family: var(--gv-body); font-weight: 700; font-size: 0.92rem; cursor: pointer;
  background: var(--gv-surface); color: var(--gv-muted); border: 1px solid var(--gv-border);
  border-radius: 10px; padding: 0.6rem 1rem; display: flex; flex-direction: column; gap: 2px;
  transition: all .15s;
}
.gv-tab small { font-weight: 500; font-size: 0.72rem; opacity: 0.85; }
.gv-tab:hover { border-color: var(--gv-accent); color: var(--gv-text); }
.gv-tab.active { background: var(--gv-accent); color: #fff; border-color: var(--gv-accent); }
.gv-tab.active small { color: #fff; opacity: 0.9; }

/* panel */
.gv-panel { background: var(--gv-surface); border: 1px solid var(--gv-border); border-radius: 16px; padding: 1.25rem; }
.gv-panel[hidden] { display: none; }
.gv-panel-title { font-family: var(--gv-display); font-weight: 900; font-size: 1.05rem; margin: 0 0 0.35rem; }
.gv-panel-sub { color: var(--gv-muted); font-size: 0.9rem; margin: 0 0 1.1rem; }

.gv-cols { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
@media (min-width: 640px) { .gv-cols.split { grid-template-columns: minmax(0,1fr) 220px; align-items: start; } }

/* stats */
.gv-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(90px,1fr)); gap: 0.6rem; }
.gv-stat { background: var(--gv-surface2); border: 1px solid var(--gv-border); border-radius: 10px; padding: 0.7rem; text-align: center; }
.gv-stat b { display: block; font-family: var(--gv-display); font-size: 1.15rem; color: var(--gv-accent); }
.gv-stat span { font-size: 0.72rem; color: var(--gv-muted); }
.gv-status { margin: 0.9rem 0 0; color: var(--gv-text); font-size: 0.9rem; min-height: 2.4em; }

/* buttons */
.gv-btn { font-family: var(--gv-body); font-weight: 700; font-size: 0.85rem; cursor: pointer; background: var(--gv-surface2); color: var(--gv-text); border: 1px solid var(--gv-border); border-radius: 8px; padding: 0.5rem 0.9rem; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
.gv-btn:hover { border-color: var(--gv-accent); }
.gv-btn.primary { background: var(--gv-accent); color: #fff; border-color: var(--gv-accent); }
.gv-toolbar { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.9rem; }

/* tic-tac-toe */
.ttt-board { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; width: 100%; max-width: 300px; margin: 0 auto; aspect-ratio: 1; }
.ttt-cell { font-family: var(--gv-display); font-weight: 900; font-size: clamp(1.6rem,8vw,2.4rem); background: var(--gv-surface2); border: 1px solid var(--gv-border); border-radius: 12px; cursor: pointer; color: var(--gv-text); display: flex; align-items: center; justify-content: center; }
.ttt-cell:hover:not(:disabled) { border-color: var(--gv-accent); }
.ttt-cell.human { color: var(--gv-blue); }
.ttt-cell.ai { color: var(--gv-amber); }
.ttt-cell:disabled { cursor: default; }

/* expectimax */
.exp-canvas-wrap { background: var(--gv-surface2); border: 1px solid var(--gv-border); border-radius: 12px; padding: 0.5rem; overflow-x: auto; }
#exp-canvas { width: 100%; display: block; min-width: 460px; }
.gv-slider-row { display: flex; align-items: center; gap: 0.75rem; margin: 1rem 0 0.5rem; }
.gv-slider-row input[type=range] { flex: 1; accent-color: var(--gv-accent); }
.gv-slider-row label { font-weight: 600; font-size: 0.9rem; white-space: nowrap; }
.gv-reco { display: inline-block; font-family: var(--gv-display); font-weight: 900; font-size: 1.1rem; padding: 0.15rem 0.7rem; border-radius: 8px; }
.gv-reco.go { background: rgba(22,163,74,0.15); color: var(--gv-green); }
.gv-reco.stop { background: rgba(220,38,38,0.12); color: var(--gv-red); }

/* bfs */
.bfs-stage { background: var(--gv-surface2); border: 1px solid var(--gv-border); border-radius: 12px; padding: 0.5rem; overflow-x: auto; }
#bfs-canvas { display: block; margin: 0 auto; touch-action: none; cursor: crosshair; }
.gv-hint { color: var(--gv-muted); font-size: 0.8rem; margin: 0.5rem 0 0; }

/* content (tool page) */
.gv-section { margin-top: 2.5rem; }
.gv-section h2 { font-family: var(--gv-display); font-weight: 900; font-size: 1.3rem; margin: 0 0 0.75rem; }
.gv-section p { color: var(--gv-muted); }
.gv-section a { color: var(--gv-accent); text-decoration: none; font-weight: 600; }
.gv-foot { border-top: 1px solid var(--gv-border); margin-top: 3rem; padding: 1.5rem 1.25rem; text-align: center; color: var(--gv-muted); font-size: 0.85rem; }
.gv-foot a { color: var(--gv-accent); text-decoration: none; }

/* embed chrome */
.gv-embed-bar { display: flex; justify-content: flex-end; padding: 0.4rem 0.6rem 0; }
.gv-embed-bar a { font-size: 0.72rem; color: var(--gv-muted); text-decoration: none; }
.gv-embed-bar a:hover { color: var(--gv-accent); }
.lk-embed .gv-wrap { padding: 0.6rem; }