/* Pathfinding Visualizer — self-contained styles, palette mirrors LK Forge. */
:root {
  --pf-bg: #f5f7ff; --pf-surface: #ffffff; --pf-surface2: #eef1fb;
  --pf-text: #0b1020; --pf-muted: #5a6178; --pf-accent: #0e7490;
  --pf-border: #dde2f2; --pf-green: #16a34a; --pf-amber: #d97706;
  --pf-red: #dc2626; --pf-heavy: #c7b8f0;
  --pf-display: 'Orbitron', system-ui, sans-serif;
  --pf-body: 'Outfit', system-ui, -apple-system, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --pf-bg: #0b1020; --pf-surface: #151b30; --pf-surface2: #1b2340;
    --pf-text: #eef1fb; --pf-muted: #9aa3c0; --pf-accent: #22d3ee;
    --pf-border: #2a3358; --pf-green: #4ade80; --pf-amber: #fbbf24;
    --pf-red: #f87171; --pf-heavy: #6d5aa8;
  }
}
* { box-sizing: border-box; }
.pf-body { margin: 0; background: var(--pf-bg); color: var(--pf-text); font-family: var(--pf-body); line-height: 1.6; }
.pf-wrap { max-width: 900px; margin: 0 auto; padding: 1.25rem; }

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

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

.pf-controls { display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-start; margin-bottom: 1rem; }
.pf-group { display: flex; flex-direction: column; gap: 0.35rem; }
.pf-group-label { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--pf-muted); }
.pf-btnrow { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.pf-btn { font-family: var(--pf-body); font-weight: 700; font-size: 0.82rem; cursor: pointer; background: var(--pf-surface); color: var(--pf-muted); border: 1px solid var(--pf-border); border-radius: 8px; padding: 0.5rem 0.85rem; }
.pf-btn:hover { border-color: var(--pf-accent); color: var(--pf-text); }
.pf-btn.active { background: var(--pf-accent); color: #fff; border-color: var(--pf-accent); }
.pf-btn.run { background: var(--pf-accent); color: #fff; border-color: var(--pf-accent); }
.pf-btn:focus-visible, a:focus-visible, #pf-canvas:focus-visible { outline: 2px solid var(--pf-accent); outline-offset: 2px; }
@media (prefers-color-scheme: dark) {
  .pf-btn.active, .pf-btn.run { color: var(--pf-bg); }
}
.pf-swatch { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: middle; }

.pf-stage { background: var(--pf-surface2); border: 1px solid var(--pf-border); border-radius: 12px; padding: 0.5rem; overflow-x: auto; }
#pf-canvas { display: block; margin: 0 auto; touch-action: none; cursor: crosshair; width: 100%; aspect-ratio: 25 / 15; }
.pf-hint { color: var(--pf-muted); font-size: 0.8rem; margin: 0.5rem 0 0; }

.pf-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 0.6rem; margin-top: 1rem; }
.pf-stat { background: var(--pf-surface2); border: 1px solid var(--pf-border); border-radius: 10px; padding: 0.7rem; text-align: center; }
.pf-stat b { display: block; font-family: var(--pf-display); font-size: 1.15rem; color: var(--pf-accent); }
.pf-stat span { font-size: 0.72rem; color: var(--pf-muted); }
.pf-compare { margin: 0.9rem 0 0; color: var(--pf-text); font-size: 0.9rem; min-height: 1.4em; background: var(--pf-surface2); border: 1px solid var(--pf-border); border-radius: 8px; padding: 0.6rem 0.8rem; }
.pf-compare:empty { display: none; }

.pf-section { margin-top: 2.5rem; }
.pf-section h2 { font-family: var(--pf-display); font-weight: 900; font-size: 1.3rem; margin: 0 0 0.75rem; }
.pf-section p { color: var(--pf-muted); }
.pf-section a { color: var(--pf-accent); text-decoration: none; font-weight: 600; }
.pf-section ul { color: var(--pf-muted); padding-left: 1.15rem; }
.pf-section li { margin-bottom: 0.5rem; }
.pf-faq h3 { font-family: var(--pf-body); font-weight: 700; font-size: 1.02rem; color: var(--pf-text); margin: 1.15rem 0 0.3rem; }
.pf-foot { border-top: 1px solid var(--pf-border); margin-top: 3rem; padding: 1.5rem 1.25rem; text-align: center; color: var(--pf-muted); font-size: 0.85rem; }
.pf-foot a { color: var(--pf-accent); text-decoration: none; }

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