:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #182033;
  --muted: #65708a;
  --border: #e5e9f0;
  --brand: #4867e8;
  --brand-dark: #3450c7;
  --soft: #eef2ff;
  --shadow: 0 18px 50px rgba(31, 42, 68, .08);
}

* { 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;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a { color: var(--brand); }

a:hover { color: var(--brand-dark); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(246, 248, 251, .88);
  border-bottom: 1px solid rgba(229, 233, 240, .9);
}

.nav {
  width: min(1050px, calc(100% - 36px));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 800;
  letter-spacing: -.02em;
  text-decoration: none;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 650;
  font-size: 14px;
}

.nav-links a[aria-current="page"] {
  color: var(--brand);
}

main {
  width: min(900px, calc(100% - 36px));
  margin: 46px auto 70px;
}

.hero {
  background: linear-gradient(135deg, #ffffff 0%, #f0f3ff 100%);
  border: 1px solid var(--border);
  border-radius: 26px;
  padding: 42px;
  box-shadow: var(--shadow);
  margin-bottom: 26px;
}

.eyebrow {
  color: var(--brand);
  font-weight: 800;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .1em;
}

h1, h2, h3 {
  line-height: 1.2;
  letter-spacing: -.025em;
}

h1 {
  font-size: clamp(34px, 6vw, 54px);
  margin: 8px 0 12px;
}

h2 {
  font-size: 24px;
  margin-top: 0;
}

.subtitle, .updated {
  color: var(--muted);
}

.updated {
  margin-top: 16px;
  font-size: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  margin: 18px 0;
  box-shadow: 0 8px 28px rgba(31, 42, 68, .04);
}

.notice {
  background: var(--soft);
  border: 1px solid #dbe2ff;
  border-radius: 16px;
  padding: 18px 20px;
  margin: 18px 0;
}

ul { padding-left: 22px; }

li + li { margin-top: 7px; }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.link-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 26px;
  text-decoration: none;
  color: var(--text);
  box-shadow: 0 8px 28px rgba(31, 42, 68, .04);
}

.link-card:hover {
  transform: translateY(-2px);
  transition: .18s ease;
  border-color: #cfd7f7;
}

.link-card strong {
  display: block;
  font-size: 21px;
  margin-bottom: 8px;
}

.link-card span { color: var(--muted); }

footer {
  width: min(900px, calc(100% - 36px));
  margin: 0 auto 36px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

code {
  background: #f0f2f7;
  padding: 2px 6px;
  border-radius: 7px;
}

@media (max-width: 700px) {
  .hero { padding: 28px 22px; }
  .card { padding: 22px; }
  .grid { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; padding: 15px 0; }
  .nav-links { justify-content: flex-end; }
}