:root {
  --bg: #f7f9fb;
  --ink: #0f1a24;
  --muted: #536271;
  --line: #d9e1e8;
  --accent: #2563eb;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1117;
    --ink: #e8eef4;
    --muted: #9aa8b5;
    --line: #22303c;
    --accent: #6ea0ff;
    --card: #111a22;
  }
}
* { 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;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }
.top { display: flex; align-items: center; justify-content: space-between; padding-top: 24px; padding-bottom: 24px; }
.brand { font-weight: 700; font-size: 20px; color: var(--ink); letter-spacing: -0.01em; }
nav a { margin-left: 20px; color: var(--muted); }
.hero { padding-top: 72px; padding-bottom: 72px; }
.eyebrow { color: var(--accent); font-weight: 600; margin: 0 0 12px; }
h1 { font-size: clamp(32px, 6vw, 52px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 20px; max-width: 18ch; }
.lead { color: var(--muted); font-size: 19px; max-width: 60ch; margin: 0 0 32px; }
.button { display: inline-block; background: var(--accent); color: #fff; padding: 12px 22px; border-radius: 8px; font-weight: 600; }
.button:hover { text-decoration: none; opacity: 0.92; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; padding-bottom: 72px; }
.grid article { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
.grid h2 { font-size: 18px; margin: 0 0 8px; }
.grid p { margin: 0; color: var(--muted); }
.foot { border-top: 1px solid var(--line); padding-top: 24px; padding-bottom: 40px; color: var(--muted); font-size: 15px; }
.foot p { margin: 0 0 8px; }
.doc { max-width: 720px; padding-top: 24px; padding-bottom: 72px; }
.doc h1 { font-size: 36px; max-width: none; }
.doc h2 { font-size: 20px; margin-top: 32px; }