:root {
  --brand: #3b6894;
  --ink: #1f2933;
  --muted: #5a6b7b;
  --line: #dce6ef;
  --bg: #f4f8fb;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 20px;
}
.brand {
  color: var(--brand);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.nav { display: flex; flex-wrap: wrap; gap: 14px; }
.nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}
.nav a:hover { color: var(--brand); }
.page {
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(31, 41, 51, 0.08);
  margin: 28px auto 40px;
  padding: 36px 40px 48px;
}
.page h1 { margin: 0 0 18px; font-size: 36px; line-height: 1.15; }
.page h2 { color: var(--brand); font-size: 23px; margin: 34px 0 10px; }
.page h3 { font-size: 19px; margin: 26px 0 8px; }
.page p, .page li { color: var(--ink); }
.page ul { padding-left: 22px; }
.page li { margin: 5px 0; }
.page a { color: var(--brand); }
.page code {
  background: #eef4fa;
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.92em;
}
.page hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }
.page table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 15px;
}
.page th, .page td {
  border: 1px solid var(--line);
  padding: 10px;
  text-align: left;
  vertical-align: top;
}
.page th { background: #eef4fa; }
.site-footer {
  color: var(--muted);
  font-size: 14px;
  padding: 0 0 34px;
  text-align: center;
}
.site-footer a { color: var(--brand); }
@media (max-width: 700px) {
  .header-inner { align-items: flex-start; flex-direction: column; gap: 10px; }
  .nav { gap: 10px; }
  .page { border-radius: 0; margin: 0; padding: 26px 18px 36px; }
  .page h1 { font-size: 30px; }
  .page table { display: block; overflow-x: auto; }
}