:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #5b6472;
  --line: #d8e0ea;
  --accent: #1f6feb;
  --accent-soft: #e8f0fe;
  --max: 980px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #eef4ff 0, var(--bg) 220px);
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(10px);
  background: rgba(255,255,255,.82);
  border-bottom: 1px solid rgba(216,224,234,.9);
}
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 18px 0;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 16px; flex-wrap: wrap; }
nav a { color: var(--muted); padding: 8px 10px; border-radius: 999px; }
nav a.active, nav a:hover { color: var(--accent); background: var(--accent-soft); text-decoration: none; }
.hero {
  padding: 44px 0 20px;
}
.hero-card, .content-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 18px 40px rgba(17,24,39,.06);
}
.hero-card { padding: 32px; }
.hero h1 { margin: 0 0 10px; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.1; }
.hero p.lead { margin: 0; color: var(--muted); font-size: 1.05rem; }
.quick-links { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 10px; }
.quick-links a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 14px; border: 1px solid var(--line); border-radius: 999px; background: #fff;
}
main { padding-bottom: 56px; }
.content-card { padding: 28px 32px; }
.content-card h1:first-child, .content-card h2:first-child { margin-top: 0; }
.content-card h1, .content-card h2, .content-card h3 { line-height: 1.25; margin-top: 1.6em; }
.content-card p, .content-card li, .content-card blockquote, .content-card div { color: var(--text); }
.content-card ul, .content-card ol { padding-left: 1.3rem; }
.content-card blockquote {
  margin: 1rem 0; padding: 0.85rem 1rem; background: #f8fbff; border-left: 4px solid var(--accent);
  border-radius: 10px;
}
.content-card > div.paragraph { margin-bottom: 1rem; }
.footer { color: var(--muted); font-size: .95rem; padding: 24px 0 40px; }
.muted { color: var(--muted); }
@media (max-width: 720px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  .hero-card, .content-card { padding: 22px; border-radius: 18px; }
}