:root {
  --brand: #4f46e5;
  --brand-2: #38bdf8;
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --soft: #f5f7ff;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #e2e8f0; --muted: #94a3b8; --line: #1e293b; --bg: #0b1020; --soft: #111833; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
a { color: var(--brand); }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; gap: 12px; height: 64px; }
header img { width: 36px; height: 36px; border-radius: 9px; }
header b { font-size: 19px; }
header nav { margin-left: auto; display: flex; gap: 18px; font-size: 15px; }
header nav a { color: var(--muted); text-decoration: none; }
.hero {
  background: linear-gradient(135deg, var(--brand-2), var(--brand));
  color: #fff;
  padding: 72px 0 80px;
}
.hero h1 { font-size: clamp(32px, 6vw, 48px); line-height: 1.15; margin: 0 0 14px; }
.hero p { font-size: 19px; max-width: 600px; opacity: .95; margin: 0 0 28px; }
.btn {
  display: inline-block; background: #fff; color: var(--brand); font-weight: 700;
  padding: 12px 22px; border-radius: 999px; text-decoration: none;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; padding: 56px 0; }
.card { background: var(--soft); border: 1px solid var(--line); border-radius: 16px; padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.doc { padding: 40px 0 64px; }
.doc h1 { font-size: 34px; margin: 0 0 4px; }
.doc .date { color: var(--muted); margin: 0 0 28px; }
.doc h2 { font-size: 21px; margin: 32px 0 8px; }
.doc li { margin: 4px 0; }
.note { background: var(--soft); border-left: 4px solid var(--brand); padding: 12px 16px; border-radius: 8px; }
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; padding: 24px 0; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; }
footer a { color: var(--muted); }