:root {
  --bg: #f7f5f1;
  --bg-elev: #ffffff;
  --fg: #14161c;
  --muted: #5c6170;
  --brand: #1f5fd1;
  --brand-ink: #0d3f9a;
  --accent: #e8a23a;
  --line: #e4e1d8;
  --ok: #1f7a4c;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(20, 22, 28, 0.08);
  --font: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1016;
    --bg-elev: #161b24;
    --fg: #f3f1ec;
    --muted: #a7adbb;
    --brand: #8db4ff;
    --brand-ink: #c9dbff;
    --accent: #f0b75a;
    --line: #2a3140;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1200px 500px at 10% -10%, color-mix(in srgb, var(--brand) 16%, transparent), transparent 60%),
    radial-gradient(900px 400px at 90% 0%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 55%),
    var(--bg);
  color: var(--fg);
  font: 17px/1.65 var(--sans);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--brand); }
a:hover { color: var(--brand-ink); }
.wrap { max-width: 980px; margin: 0 auto; padding: 24px 18px 72px; }
.site-header {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 8px 0 28px; border-bottom: 1px solid var(--line); margin-bottom: 28px;
}
.brand {
  font-family: var(--font); font-size: 28px; font-weight: 700; letter-spacing: -0.02em;
  color: var(--fg); text-decoration: none;
}
.nav { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; font-weight: 600; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--fg); }
.hero {
  display: grid; gap: 28px; align-items: center;
  grid-template-columns: 1.15fr 0.85fr; margin: 12px 0 40px;
}
@media (max-width: 820px) {
  .hero { grid-template-columns: 1fr; }
  .brand { font-size: 24px; }
}
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--brand-ink); margin-bottom: 10px;
}
h1 {
  font-family: var(--font); font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.12; letter-spacing: -0.03em; margin: 0 0 14px;
}
h2 {
  font-family: var(--font); font-size: 1.55rem; line-height: 1.25;
  letter-spacing: -0.02em; margin: 36px 0 10px;
}
h3 { font-size: 1.05rem; margin: 22px 0 6px; }
.lead { font-size: 1.12rem; color: var(--muted); margin: 0 0 20px; max-width: 42rem; }
.muted { color: var(--muted); font-size: 0.95rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 999px; padding: 12px 18px; font-weight: 700; text-decoration: none;
  border: 1px solid transparent; transition: transform .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-ink); color: #fff; }
.btn-secondary { background: var(--bg-elev); color: var(--fg); border-color: var(--line); box-shadow: var(--shadow); }
.hero-media, .card, .callout, .quiz-card {
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.hero-media { overflow: hidden; aspect-ratio: 4/3; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin: 18px 0; }
.card { padding: 18px; }
.card h3 { margin-top: 0; }
.callout { padding: 18px 20px; margin: 24px 0; border-left: 4px solid var(--brand); }
.breadcrumbs { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--brand); }
.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { padding-left: 1.2rem; margin: 0 0 16px; }
.prose li { margin: 0 0 8px; }
.table-wrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; background: var(--bg-elev); }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 13px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
.quiz-card { padding: 22px; max-width: 640px; }
.quiz-options { display: grid; gap: 10px; margin: 16px 0; }
.quiz-options button, .quiz-options a.option {
  text-align: left; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--bg); color: var(--fg); font: inherit; cursor: pointer; text-decoration: none;
}
.quiz-options button:hover, .quiz-options a.option:hover { border-color: var(--brand); }
.site-footer {
  margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line);
  display: grid; gap: 10px; color: var(--muted); font-size: 14px;
}
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--fg); }
.tag {
  display: inline-block; font-size: 12px; font-weight: 700; padding: 4px 8px;
  border-radius: 999px; background: color-mix(in srgb, var(--brand) 14%, transparent); color: var(--brand-ink);
}
.stat-row { display: flex; flex-wrap: wrap; gap: 18px; margin: 18px 0; }
.stat { min-width: 120px; }
.stat strong { display: block; font-family: var(--font); font-size: 1.6rem; line-height: 1.1; }
.related { margin-top: 40px; }
.related a { display: block; margin: 6px 0; }