:root {
  --bg: #fbfaf7; --ink: #16181d; --muted: #5d636e; --line: #e4e1da; --accent: #2f5bea;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111317; --ink: #eceef2; --muted: #9aa1ad; --line: #2a2e36; --accent: #8fa8ff; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap { max-width: 680px; margin: 0 auto; padding: 0 20px; }
header { padding: 28px 0; border-bottom: 1px solid var(--line); }
header .wrap { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 20px; letter-spacing: -0.01em; color: var(--ink); text-decoration: none; }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:first-child { margin-left: 0; }
nav a:hover, footer a:hover { color: var(--accent); }
main { padding: 56px 0 72px; }
h1 { font-size: clamp(30px, 6vw, 44px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 20px; }
h2 { font-size: 20px; margin: 40px 0 8px; }
p { margin: 0 0 16px; }
.lead { font-size: 20px; color: var(--muted); }
a { color: var(--accent); }
dl { margin: 0; }
dt { color: var(--muted); font-size: 14px; margin-top: 18px; }
dd { margin: 2px 0 0; }
footer { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); margin-right: 16px; }