:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --ink: #16222e;
  --muted: #5c6b7a;
  --brand: #0a6b3a;
  --brand-soft: #e6f4ec;
  --accent: #b8860b;
  --line: #e3e9f0;
  --radius: 14px;
  --maxw: 780px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.logo {
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
}
.logo span { color: var(--brand); }

.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  transition: background .2s, color .2s;
}
.nav a:hover { background: var(--brand-soft); color: var(--brand); }

/* Hero */
.hero {
  background:
    radial-gradient(1200px 400px at 50% -10%, var(--brand-soft), transparent 60%),
    var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 72px 0 64px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}

.lede {
  font-size: 18px;
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto;
}

/* Sections */
.section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 40px;
  margin-top: 28px;
}

.section h2 {
  font-size: 26px;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
}

.section h3 {
  font-size: 18px;
  margin: 26px 0 10px;
  color: var(--brand);
}

.section p { margin: 0 0 14px; color: var(--ink); }

.split-list {
  margin: 0 0 14px;
  padding-left: 20px;
  list-style: none;
  counter-reset: item;
}
.split-list li {
  position: relative;
  padding: 10px 0 10px 10px;
  border-top: 1px dashed var(--line);
  counter-increment: item;
}
.split-list li:first-child { border-top: none; }
.split-list li::before {
  content: counter(item);
  position: absolute;
  left: -20px;
  top: 12px;
  width: 26px;
  height: 26px;
  background: var(--brand-soft);
  color: var(--brand);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
}

.split-list strong { color: var(--brand); }

/* Glossary */
.glossary {
  margin: 0;
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 4px 20px;
}
.glossary dt {
  font-weight: 700;
  color: var(--brand);
  padding: 8px 0;
}
.glossary dd {
  margin: 0;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.glossary dt:last-of-type, .glossary dd:last-of-type { border-bottom: none; }

/* Disclaimer */
.disclaimer {
  background: #fff8ec;
  border-color: #f0e3c3;
}
.disclaimer h2 { color: var(--accent); }
.disclaimer p { color: #6b5730; }

/* Footer */
.site-footer {
  margin-top: 48px;
  padding: 28px 0;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

/* Mobile */
@media (max-width: 560px) {
  .header-inner { flex-direction: column; gap: 10px; }
  .nav { justify-content: center; }
  .section { padding: 26px 22px; }
  .glossary { grid-template-columns: 1fr; }
  .glossary dt { padding-bottom: 0; }
}