:root { --fg: #1a1a2e; --bg: #fafafb; --accent: #e68a3c; --muted: #6b7280; }
* { box-sizing: border-box; }
body { margin: 0 auto; padding: 2rem 1.2rem 4rem; max-width: 720px; color: var(--fg); background: var(--bg);
  font: 16px/1.75 "Segoe UI", system-ui, sans-serif; }
h1, h2, h3 { line-height: 1.25; }
a { color: var(--accent); }
.demo { border: 2px dashed var(--accent); border-radius: .5rem; padding: 1rem; margin: 1.2rem 0; background: #fff; }
.toc { padding-left: 1.2rem; } .toc li { margin: .35rem 0; }
.bab-header .badge { display: inline-block; font-size: .78rem; color: var(--muted);
  border: 1px solid var(--muted); border-radius: 999px; padding: .1rem .6rem; margin-bottom: .4rem; }
figure img { max-width: 100%; height: auto; }
code, pre { font: .92em/1.5 ui-monospace, monospace; background: #f0f1f4; border-radius: .3rem; }
pre { padding: .8rem 1rem; overflow-x: auto; }
.pair { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 720px) { .pair { grid-template-columns: 1fr 1fr; } }
.pair .pane { border: 1px solid #e5e7eb; border-radius: .5rem; padding: .8rem; }
.pair h3 { font-size: .85rem; text-transform: uppercase; color: var(--muted); margin: 0 0 .5rem; }
footer.site { margin-top: 3rem; font-size: .82rem; color: var(--muted); text-align: center; }
.bab-nav { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid #e5e7eb; font-size: .95rem; }