:root {
  --ink: #1f2a33;
  --muted: #5b6770;
  --line: #e3e8ec;
  --bg: #ffffff;
  --panel: #f6f7f8;
  --accent: #B41F3A;
  --accent-dark: #8f172e;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }
header.top {
  border-bottom: 1px solid var(--line);
}
header.top .wrap {
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.brand { font-weight: 700; font-size: 22px; letter-spacing: -0.01em; color: var(--ink); }
.brand span { color: var(--accent); }
nav a { margin-left: 22px; color: var(--muted); font-weight: 600; font-size: 15px; }
nav a:hover { color: var(--ink); text-decoration: none; }
.hero { padding: 72px 0 40px; }
.hero h1 { font-size: 40px; line-height: 1.15; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero p.lead { font-size: 20px; color: var(--muted); max-width: 640px; margin: 0 0 28px; }
.btn {
  display: inline-block; background: var(--accent); color: #fff; padding: 12px 20px;
  border-radius: 8px; font-weight: 600;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; padding: 24px 0 56px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 22px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
main.doc { padding: 48px 0 64px; }
main.doc h1 { font-size: 32px; margin: 0 0 6px; letter-spacing: -0.02em; }
main.doc .updated { color: var(--muted); margin: 0 0 32px; font-size: 15px; }
main.doc h2 { font-size: 21px; margin: 32px 0 10px; }
main.doc p, main.doc li { max-width: 760px; }
main.doc ul { padding-left: 22px; }
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
footer a { color: var(--muted); }
@media (max-width: 600px) {
  .hero { padding: 48px 0 24px; }
  .hero h1 { font-size: 32px; }
  nav a { margin-left: 14px; }
}