:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5f6b7a;
  --line: #dde3ea;
  --brand: #3157d5;
  --brand-soft: #eef2ff;
  --max: 920px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}
a { color: var(--brand); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
header {
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
nav { display: flex; gap: 16px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }
main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 64px 22px 80px;
}
.hero {
  padding: 28px 0 18px;
}
.eyebrow {
  display: inline-block;
  background: var(--brand-soft);
  color: var(--brand);
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 12px;
}
h1, h2, h3 {
  line-height: 1.22;
  letter-spacing: -0.025em;
}
h1 { font-size: clamp(2.1rem, 6vw, 3.6rem); margin: 0 0 16px; }
h2 { margin-top: 42px; font-size: 1.55rem; }
h3 { margin-top: 28px; font-size: 1.1rem; }
.lead { font-size: 1.16rem; color: var(--muted); max-width: 760px; }
.meta { color: var(--muted); font-size: 14px; margin-top: 10px; }
.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 28px 0;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 7px 24px rgba(23,32,51,.04);
}
.card h2, .card h3 { margin-top: 0; }
.callout {
  background: var(--brand-soft);
  border: 1px solid #dbe2ff;
  border-radius: 14px;
  padding: 16px 18px;
  margin: 24px 0;
}
table {
  border-collapse: collapse;
  width: 100%;
  background: var(--surface);
  margin: 18px 0 28px;
}
th, td {
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  padding: 12px;
}
th { background: #f1f4f8; }
code {
  background: #eef1f5;
  padding: .1em .35em;
  border-radius: 5px;
}
footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 26px 22px 40px;
  color: var(--muted);
  font-size: 14px;
}
.footer-links {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
ul, ol { padding-left: 22px; }
@media (max-width: 720px) {
  .nav { align-items: flex-start; flex-direction: column; }
  main { padding-top: 38px; }
  .grid { grid-template-columns: 1fr; }
  nav { gap: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}