:root {
  --bg: #f6f5f1;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #5f6670;
  --line: #e3e1da;
  --accent: #534ab7;
  --accent-soft: #eeedfe;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --card: #1e2125;
    --text: #e9eaec;
    --muted: #a2a8b1;
    --line: #33373d;
    --accent: #9d96f0;
    --accent-soft: #2a2747;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.55;
}
.page { max-width: 1180px; margin: 0 auto; padding: 28px 16px 48px; }
header { margin-bottom: 22px; }
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); line-height: 1.15; margin: 0 0 6px; letter-spacing: -0.01em; }
.intro { margin: 0; color: var(--muted); font-size: 1.05rem; max-width: 65ch; }

/* Simulation on the left (sticky), everything else on the right; one column on phones. */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}
.sim { position: sticky; top: 16px; }
.side { display: grid; gap: 20px; min-width: 0; }
@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .sim { position: static; }
}

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; min-width: 0; }
h2 { font-size: 1rem; margin: 0 0 10px; }
h3 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin: 16px 0 6px; }
p { margin: 0 0 10px; }
.muted { color: var(--muted); font-size: 0.9rem; }

/* Canvases: pixel grids scaled up crisply. */
canvas.grid { display: block; width: 100%; aspect-ratio: 1; image-rendering: pixelated; border-radius: 8px; cursor: crosshair; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; }
.fields canvas { cursor: default; }
.caption { font-size: 0.8rem; color: var(--muted); margin-top: 2px; }
.stats { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 6px 12px; margin: 12px 0; color: var(--muted); font-size: 0.95rem; }
.stats b { color: var(--text); font-variant-numeric: tabular-nums; }
.buttons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
button {
  font: inherit; font-size: 0.95rem; min-height: 44px; padding: 8px 12px; cursor: pointer;
  border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--text);
}
button:hover { border-color: var(--accent); }
button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
#play { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-top: 12px; font-size: 0.85rem; color: var(--muted); }
.swatch { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.ramp { display: inline-block; width: 44px; height: 10px; border-radius: 3px; margin: 0 6px; vertical-align: 0;
        background: linear-gradient(90deg, #d85a30, #534ab7); }

/* Sliders */
.slider { margin-top: 12px; }
.slider label { display: flex; justify-content: space-between; gap: 12px; font-size: 0.95rem; }
.slider b { font-variant-numeric: tabular-nums; }
.slider input[type=range] { width: 100%; margin: 6px 0 0; accent-color: var(--accent); }
.toggle { display: flex; align-items: center; gap: 8px; margin-top: 14px; font-size: 0.95rem; }
.toggle input { width: 18px; height: 18px; accent-color: var(--accent); }

/* Presets: button beside its one-line explanation */
.preset { display: grid; grid-template-columns: 11rem 1fr; gap: 12px; align-items: center; padding: 5px 0; }
.preset button { width: 100%; text-align: left; }
.preset button.active { background: var(--accent-soft); border-color: var(--accent); font-weight: 600; }
.preset span { font-size: 0.88rem; color: var(--muted); }
@media (max-width: 460px) { .preset { grid-template-columns: 1fr; gap: 4px; } }

/* Charts and inspector */
canvas.chart { display: block; width: 100%; height: 150px; }
.inspect-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; align-items: start; }
@media (max-width: 460px) { .inspect-grid { grid-template-columns: 1fr; } }
.kv { display: grid; grid-template-columns: auto auto; gap: 2px 12px; font-size: 0.9rem; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }
canvas.plane { display: block; width: 100%; aspect-ratio: 1; }

.explainer h3:first-child { margin-top: 0; }
.explainer code { font-size: 0.9em; }
.vec { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.88rem; white-space: nowrap; }
footer { margin-top: 28px; font-size: 0.85rem; color: var(--muted); }

/* ---- Redesign (2026-10-11): one map with view tabs, question cards, folded extras ---- */
.tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-bottom: 10px; }
.tabs button[aria-selected="true"], .speed button.active { background: var(--accent-soft); border-color: var(--accent); font-weight: 600; }
.speed { display: flex; align-items: center; gap: 8px; margin-top: 12px; }
.speed button { min-height: 36px; padding: 4px 12px; font-size: 0.9rem; }
.question { padding: 12px 0; border-top: 1px solid var(--line); }
.question:first-of-type { border-top: none; padding-top: 0; }
.question h3 { text-transform: none; letter-spacing: 0; font-size: 1rem; color: var(--text); margin: 0 0 6px; }
.question p { font-size: 0.92rem; margin-bottom: 6px; }
.question .watch { color: var(--muted); }
.question.active h3 { color: var(--accent); }
.qbuttons { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.qbuttons .run.active, .qbuttons .compare.active { background: var(--accent-soft); border-color: var(--accent); font-weight: 600; }
.chart-title { font-size: 0.9rem; font-weight: 600; margin: 4px 0 2px; }
.how { margin-top: 20px; }
.how-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 8px 24px; }
.how h3 { text-transform: none; letter-spacing: 0; font-size: 0.98rem; color: var(--text); margin: 10px 0 4px; }
.how p { font-size: 0.92rem; }
.how-svg { width: 100%; max-width: 340px; display: block; margin: 4px 0 8px; }
.how-svg .t { font: 12px system-ui, sans-serif; fill: var(--text); }
.vecs { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.86rem; }
details.more { margin-top: 20px; }
details.more summary { cursor: pointer; font-weight: 600; }
details.more[open] summary { margin-bottom: 8px; }
.help { font-size: 0.82rem; color: var(--muted); margin: 2px 0 0; }
.toggle { align-items: flex-start; }
.toggle span { font-size: 0.92rem; }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: #2c2c2a; margin-right: 6px; vertical-align: -1px; }
.swatch.outline { background: transparent; border: 1.5px solid #d85a30; }
.how.top { margin: 0 0 20px; }
.how .wide { grid-column: 1 / -1; }
.how ul { margin: 0 0 10px; padding-left: 20px; font-size: 0.92rem; }
.how li { margin-bottom: 6px; }
.tip { font-size: 0.88rem; color: var(--muted); background: var(--accent-soft); border-radius: 8px; padding: 8px 10px; margin-top: 8px; }
.viewlink { min-height: 0; padding: 1px 8px; font-size: 0.85rem; border-radius: 6px; }
details.seen { margin-top: 8px; }
details.seen summary { cursor: pointer; font-weight: 600; color: var(--accent); }
details.seen p { font-size: 0.9rem; }
details.seen sup a { color: var(--accent); }