:root {
  --bg: #f7f9fc;
  --card: #ffffff;
  --text: #1c2534;
  --muted: #5e6b7e;
  --line: #e5ebf2;
  --brand: #246bfe;
  --brand-dark: #164fcc;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.site-header {
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
}
.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.logo {
  font-weight: 800;
  font-size: 20px;
  color: var(--text);
}
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 15px;
}
.hero {
  padding: 76px 0 56px;
  background: linear-gradient(135deg, #eef4ff 0%, #fff 55%, #f5fbff 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 34px;
  align-items: center;
}
.badge {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid #cbd9ff;
  border-radius: 999px;
  color: var(--brand-dark);
  background: #f4f7ff;
  font-size: 14px;
}
h1, h2, h3 { line-height: 1.28; margin: 0 0 16px; }
h1 { font-size: clamp(34px, 5vw, 54px); letter-spacing: -1px; }
h2 { font-size: 30px; margin-top: 14px; }
h3 { font-size: 22px; margin-top: 20px; }
p { margin: 0 0 16px; }
.lead { font-size: 18px; color: var(--muted); }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 700;
  border: 1px solid var(--brand);
}
.btn.primary { color: #fff; background: var(--brand); }
.btn.secondary { color: var(--brand-dark); background: #fff; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 12px 40px rgba(28,37,52,.06);
}
.section { padding: 56px 0; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.kv-list { margin: 0; padding-left: 20px; color: var(--muted); }
.breadcrumb { font-size: 14px; color: var(--muted); margin-bottom: 20px; }
.article {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 34px;
}
.article p { color: #344154; }
.note {
  background: #f4f8ff;
  border: 1px solid #dce8ff;
  border-radius: 16px;
  padding: 18px;
  color: #31405a;
}
.footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: #fff;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 10px; }
@media (max-width: 820px) {
  .hero-grid, .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; flex-direction: column; padding: 14px 0; }
}