:root { --ink: #10131a; --muted: #5b6270; --line: #e6e8ec; --accent: #1f5fd6; --soft: #f6f7f9; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: #fff; color: var(--ink); font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif; }
a { color: var(--accent); text-underline-offset: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header.top { border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; gap: 12px; height: 64px; }
header.top img { width: 32px; height: 32px; border-radius: 8px; }
header.top a.brand { color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.01em; }
main.wrap { padding-top: 40px; padding-bottom: 56px; }
h1 { font-size: 32px; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 8px; }
h2 { font-size: 20px; line-height: 1.3; margin: 40px 0 10px; }
h3 { font-size: 16px; margin: 24px 0 6px; }
p, ul, ol { margin: 0 0 14px; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
.lead { font-size: 18px; color: var(--muted); margin-bottom: 28px; }
.date { color: var(--muted); font-size: 14px; margin-bottom: 28px; }
.box { background: var(--soft); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin: 18px 0; }
table { width: 100%; border-collapse: collapse; margin: 10px 0 18px; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 9px 10px; border-bottom: 1px solid var(--line); }
th { font-weight: 600; background: var(--soft); }
.scroll { overflow-x: auto; }
nav.toc ol { columns: 2; column-gap: 32px; font-size: 15px; }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer .wrap { padding-top: 20px; padding-bottom: 32px; display: flex; flex-wrap: wrap; gap: 8px 18px; }
footer a { color: var(--muted); }
@media (max-width: 560px) { h1 { font-size: 26px; } nav.toc ol { columns: 1; } th, td { padding: 8px 6px; } }