:root {
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #182033;
  --muted: #667085;
  --line: #e5e7eb;
  --accent: #1f6feb;
  --accent-soft: #e8f1ff;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #ffffff 0%, var(--bg) 40%, var(--bg) 100%);
  line-height: 1.65;
}
.container { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }
.site-header { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.86); backdrop-filter: blur(12px); position: sticky; top: 0; }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 64px; gap: 24px; }
.brand { font-weight: 750; color: var(--text); text-decoration: none; letter-spacing: -.02em; }
.nav { display: flex; gap: 18px; flex-wrap: wrap; }
.nav a { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav a:hover { color: var(--accent); }
.main { padding: 56px 0 72px; }
.hero { padding: 38px; background: var(--panel); border: 1px solid var(--line); border-radius: 24px; box-shadow: 0 18px 50px rgba(20, 30, 60, .06); margin-bottom: 28px; }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .12em; font-size: 12px; font-weight: 700; margin: 0 0 10px; }
h1 { font-size: clamp(32px, 4vw, 52px); line-height: 1.08; margin: 0 0 16px; letter-spacing: -.04em; }
h2 { margin-top: 32px; font-size: 24px; }
.lead { color: var(--muted); font-size: 18px; max-width: 780px; }
.content { background: var(--panel); border: 1px solid var(--line); border-radius: 24px; padding: 34px 38px; box-shadow: 0 14px 40px rgba(20, 30, 60, .04); }
.content a { color: var(--accent); }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.card { display: block; padding: 22px; border-radius: 18px; border: 1px solid var(--line); text-decoration: none; background: #fff; color: var(--text); transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease; }
.card:hover { transform: translateY(-2px); border-color: #bfdbfe; box-shadow: 0 10px 30px rgba(31, 111, 235, .08); }
.card strong { display: block; margin-bottom: 8px; }
.card span { color: var(--muted); font-size: 14px; }
table { width: 100%; border-collapse: collapse; margin: 22px 0; }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
th { background: var(--accent-soft); }
code { background: #f2f4f7; padding: 2px 6px; border-radius: 6px; }
.site-footer { border-top: 1px solid var(--line); background: #fff; }
.footer-inner { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--muted); font-size: 14px; }
@media (max-width: 760px) {
  .header-inner, .footer-inner { align-items: flex-start; flex-direction: column; padding: 16px 0; }
  .cards { grid-template-columns: 1fr; }
  .hero, .content { padding: 26px; }
}