:root {
  --bg: #ffffff; --text: #1f2933; --muted: #5f6c7b; --line: #e3e8ee;
  --accent: #1f4e8c; --soft: #f5f7fa;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14181d; --text: #e6eaef; --muted: #98a4b3; --line: #2a313a; --accent: #7fb0ea; --soft: #1b2027; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.7 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header { border-bottom: 1px solid var(--line); }
.header-inner { display: flex; justify-content: space-between; align-items: center; padding-top: 18px; padding-bottom: 18px; flex-wrap: wrap; gap: 8px; }
.site-title { font-weight: 700; color: var(--text); }
nav a { margin-left: 20px; color: var(--muted); }
nav a:hover { color: var(--text); text-decoration: none; }
main { padding-top: 36px; padding-bottom: 60px; min-height: 70vh; }
h1 { font-size: 2rem; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 1.35rem; margin: 2.2rem 0 0.6rem; }
h3 { font-size: 1.1rem; margin: 1.6rem 0 0.4rem; }
.meta, .eyebrow { color: var(--muted); font-size: 0.9rem; margin: 0 0 6px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.06em; }
.lede { font-size: 1.1rem; color: var(--muted); }
.prose img { max-width: 100%; }
.prose pre { background: var(--soft); border: 1px solid var(--line); padding: 14px; overflow-x: auto; border-radius: 6px; font-size: 0.88rem; line-height: 1.5; }
.prose code { background: var(--soft); padding: 2px 5px; border-radius: 4px; font-size: 0.9em; }
.prose pre code { background: none; padding: 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.prose blockquote { margin: 1.2rem 0; padding-left: 16px; border-left: 3px solid var(--line); color: var(--muted); }
.facts { display: grid; grid-template-columns: 110px 1fr; gap: 6px 12px; margin: 18px 0 0; padding: 14px 16px; background: var(--soft); border-radius: 6px; font-size: 0.95rem; }
.facts dt { color: var(--muted); } .facts dd { margin: 0; word-break: break-word; }
.card-list { list-style: none; padding: 0; margin: 0; }
.card-list li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.card-list h3 { margin: 0 0 4px; }
.card-list p { margin: 4px 0 0; color: var(--muted); }
.tag { display: inline-block; font-size: 0.78rem; color: var(--muted); border: 1px solid var(--line); padding: 1px 8px; border-radius: 999px; margin-right: 6px; }
.back { margin-top: 40px; }
.site-footer { border-top: 1px solid var(--line); padding: 22px 0; color: var(--muted); font-size: 0.9rem; }
.site-footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.site-footer .links a { margin-left: 16px; }