.concept-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.concept-card { padding: 1.1rem; border: 1px solid var(--line); background: var(--surface); }
.concept-card h3 { color: var(--accent); }
.concept-card p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.simulator { max-width: 920px; padding: 1.4rem; border: 1px solid var(--line); background: var(--surface); }
.sim-controls { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1.2rem; }
.sim-controls button { flex: 1 1 9rem; }
.timeline { display: grid; gap: 0.65rem; }
.timeline-row { display: grid; grid-template-columns: 8rem minmax(0, 1fr) 4.5rem; gap: 0.75rem; align-items: center; }
.timeline-row strong { font-size: 0.82rem; }
.track { position: relative; height: 1.35rem; overflow: hidden; border-radius: 999px; background: var(--code); }
.bar { position: absolute; inset-block: 0; left: var(--start, 0%); width: var(--width, 10%); border-radius: inherit; background: var(--accent); transition: left 220ms ease, width 220ms ease; }
.bar[data-kind="wait"] { background: var(--warm); }
.timeline-row output { color: var(--muted); font-variant-numeric: tabular-nums; text-align: right; }
.sim-result { margin: 1.1rem 0 0; padding: 0.9rem 1rem; border-left: 0.3rem solid var(--accent); background: var(--code); }
.sim-result p { margin: 0; }
.sim-result p + p { margin-top: 0.35rem; }
.architecture { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0.7rem; margin-top: 1rem; }
.architecture article { min-height: 8rem; padding: 0.85rem; border: 1px solid var(--line); background: white; }
.architecture strong { display: block; margin-bottom: 0.35rem; font-size: 0.86rem; }
.architecture small { display: block; color: var(--muted); }
.architecture article::after { display: inline-block; margin-top: 0.65rem; padding: 0.05rem 0.35rem; border: 1px solid currentColor; border-radius: 999px; content: attr(data-mode); color: var(--accent); font-size: 0.64rem; font-weight: 750; letter-spacing: 0.05em; text-transform: uppercase; }
.budget-meter { height: 1rem; overflow: hidden; margin: 1rem 0 0.35rem; border-radius: 999px; background: var(--code); }
.budget-meter span { display: block; width: var(--budget, 50%); height: 100%; background: var(--accent); transition: width 220ms ease, background 220ms ease; }
.budget-meter[data-risk="high"] span { background: var(--warm); }
.budget-copy { color: var(--muted); font-size: 0.85rem; }
.comparison { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.comparison article { padding: 1rem; background: var(--surface); }
.comparison p { margin: 0; color: var(--muted); font-size: 0.88rem; }
.boundary-code { max-width: 920px; overflow-x: auto; margin: 1rem 0; padding: 1rem; background: var(--ink); color: var(--surface); font-size: 0.82rem; line-height: 1.55; }
.boundary-code code { padding: 0; background: transparent; }
.evidence-stack { display: grid; gap: 0.65rem; }
.evidence { display: grid; grid-template-columns: 8rem minmax(0, 1fr); gap: 1rem; padding: 0.9rem 1rem; border: 1px solid var(--line); background: var(--surface); }
.evidence strong { color: var(--accent); }
.evidence p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.recall { display: grid; gap: 0.65rem; max-width: 850px; }
.recall details { padding: 0.85rem 1rem; border: 1px solid var(--line); background: var(--surface); }
.recall summary { font-weight: 700; cursor: pointer; }
.recall p { margin-bottom: 0; color: var(--muted); }
.decision-list { display: grid; gap: 0.55rem; }
.decision-list label { display: grid; grid-template-columns: 1.2rem 1fr; gap: 0.65rem; align-items: start; padding: 0.75rem; border: 1px solid var(--line); background: white; cursor: pointer; }
.decision-list input { margin-top: 0.3rem; accent-color: var(--accent); }
.scorecard { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; margin-top: 1rem; border: 1px solid var(--line); background: var(--line); }
.scorecard div { padding: 0.8rem; background: var(--surface); }
.scorecard b, .scorecard span { display: block; }
.scorecard b { color: var(--accent); font-size: 1.25rem; }
.scorecard span { color: var(--muted); font-size: 0.76rem; }
@media (max-width: 760px) {
  .concept-grid, .comparison { grid-template-columns: 1fr; }
  .architecture, .scorecard { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .timeline-row, .evidence { grid-template-columns: 1fr; gap: 0.3rem; }
  .timeline-row output { text-align: left; }
  .architecture, .scorecard { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { .bar, .budget-meter span { transition: none; } }
@media print {
  .sim-controls { display: none; }
  .concept-card, .comparison article, .architecture article, .recall details { break-inside: avoid; }
}