:root { --bg: #f5f4f1; --panel: #ffffff; --ink: #1d1d1f; --muted: #6b6b72; --line: #e2e0db; --accent: #d2561b; --soft: #faf3ee; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #131315; --panel: #1c1c1f; --ink: #ececee; --muted: #9a9aa3; --line: #2d2d32; --accent: #ff7a3d; --soft: #26201c; }
}
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 780px; margin: 0 auto; padding: 16px 16px 48px; }
header.top { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; padding: 6px 0 14px; font-size: 15px; }
header.top .brand { font-weight: 700; color: var(--ink); text-decoration: none; margin-right: auto; }
.crumbs { font-size: 14px; color: var(--muted); margin: 0 0 8px; }
.crumbs a { color: var(--muted); }
article { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 8px 28px 28px; }
h1 { font-size: 30px; line-height: 1.25; margin: 18px 0 8px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 22px 0 6px; }
p, li { margin: 8px 0; }
ul, ol { padding-left: 24px; }
a { color: var(--accent); }
.lead { font-size: 18px; }
.muted { color: var(--muted); font-size: 14px; }
.table { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { border-bottom: 1px solid var(--line); padding: 7px 10px; text-align: left; vertical-align: top; }
th { font-weight: 600; }
.note { background: var(--soft); border-left: 3px solid var(--accent); padding: 10px 14px; border-radius: 6px; margin: 16px 0; }
.formula { font-family: ui-monospace, Consolas, monospace; font-size: 15px; background: var(--soft); padding: 10px 14px; border-radius: 6px; overflow-x: auto; white-space: pre; }
.cta { display: inline-block; background: var(--accent); color: #fff; text-decoration: none; font-weight: 600; padding: 10px 18px; border-radius: 8px; margin: 10px 0; }
.related { margin-top: 28px; }
.related ul, .list { list-style: none; padding: 0; }
.related li, .list li { margin: 10px 0; }
.list .desc { display: block; color: var(--muted); font-size: 15px; }
footer { font-size: 14px; color: var(--muted); padding: 20px 0; text-align: center; }
footer a { color: var(--muted); }
@media (max-width: 480px) { article { padding: 4px 16px 18px; } h1 { font-size: 25px; } }