:root { color-scheme: light dark; }
html { scroll-padding-top: 20px; }
body { max-width: 860px; margin: 0 auto; padding: 24px 20px 64px; font: 16px/1.8 system-ui, -apple-system, "Segoe UI", sans-serif; color: #172033; background: #fff; }
a { color: #1859a4; text-underline-offset: 3px; }
a:focus-visible, summary:focus-visible { outline: 3px solid #1859a4; outline-offset: 4px; }
h1 { font-size: clamp(26px, 5vw, 38px); line-height: 1.3; margin: 24px 0 12px; }
h2 { margin-top: 38px; font-size: 23px; line-height: 1.4; }
h3 { font-size: 18px; }
nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
figure { margin: 28px 0; }
figure img { display: block; width: 100%; height: auto; border: 1px solid #cad1dd; border-radius: 8px; }
figcaption, .byline, .muted { color: #4c586a; font-size: 14px; line-height: 1.65; }
figcaption { margin-top: 10px; }
.guide-lead { font-size: 18px; }
.guide-setup { padding: 16px 20px; border-left: 4px solid #1859a4; background: #eff5fc; }
.guide-setup p { margin: 4px 0; }
.reading-path { margin: 24px 0; padding: 18px 22px; border-left: 4px solid #1859a4; background: #eff5fc; }
.reading-path h2 { margin: 0 0 10px; border: 0; padding: 0; font-size: 20px; text-align: left; }
.reading-path ol { margin: 0; padding-left: 22px; }
.reading-path li { padding: 5px 0; }
.reading-path p { margin: 4px 0; }
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 18px 0; font-variant-numeric: tabular-nums; }
caption { text-align: left; font-weight: 650; margin-bottom: 8px; }
th, td { text-align: left; border-bottom: 1px solid #cad1dd; padding: 10px; }
.play-link { display: inline-block; padding: 10px 20px; background: #1859a4; color: white; border-radius: 6px; text-decoration: none; font-weight: 650; }
footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid #cad1dd; font-size: 14px; }
@media (prefers-color-scheme: dark) {
  body { background: #111827; color: #e2e8f0; }
  a { color: #93c5fd; }
  a:focus-visible { outline-color: #93c5fd; }
  .byline, figcaption, .muted { color: #bdc8d8; }
  .reading-path, .guide-setup { background: #1b2d45; border-color: #93c5fd; }
  th, td, footer, figure img { border-color: #475569; }
  .play-link { background: #93c5fd; color: #111827; }
}
@media (max-width: 480px) {
  body { padding: 18px 16px 48px; }
  th, td { padding: 8px 6px; font-size: 14px; }
  .reading-path, .guide-setup { padding: 14px; }
}