:root {
  --ink: #0f172a;
  --ink-soft: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --accent: #1d4ed8;
  --accent-ink: #ffffff;
  --max: 1080px;
  --radius: 10px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- header ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  z-index: 10;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  font-size: 17px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 700;
}

.nav {
  display: flex;
  gap: 26px;
  font-size: 14.5px;
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

.nav a:hover { color: var(--ink); }

/* ---------- hero ---------- */

.hero {
  padding: 88px 0 72px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
}

h1 {
  font-size: clamp(32px, 5vw, 50px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
  font-weight: 700;
  max-width: 20ch;
}

.lede {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 32px;
}

/* ---------- buttons ---------- */

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--radius);
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: opacity 0.15s ease;
}

.btn:hover { opacity: 0.85; }

.btn-primary { background: var(--ink); color: #fff; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

/* ---------- sections ---------- */

section { padding: 64px 0; }

.section-head { margin-bottom: 36px; }

h2 {
  font-size: clamp(22px, 3vw, 28px);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
  font-weight: 700;
}

.section-sub {
  color: var(--ink-soft);
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--bg-soft);
}

.card h3 {
  font-size: 16px;
  margin: 0 0 8px;
  font-weight: 650;
}

.card p {
  margin: 0;
  font-size: 14.5px;
  color: var(--ink-soft);
}

/* ---------- facts ---------- */

.facts {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.facts dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 40px;
  margin: 0;
}

.fact {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.fact dt {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.fact dd {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
}

/* ---------- legal pages ---------- */

.legal { padding: 56px 0 80px; }

.legal h1 {
  font-size: clamp(26px, 4vw, 36px);
  max-width: none;
  margin-bottom: 8px;
}

.legal .updated {
  color: var(--ink-soft);
  font-size: 14px;
  margin: 0 0 36px;
}

.legal h2 {
  font-size: 19px;
  margin: 40px 0 12px;
  padding-top: 8px;
}

.legal h3 {
  font-size: 16px;
  margin: 24px 0 8px;
}

.legal p, .legal li {
  color: #334155;
  font-size: 15px;
}

.legal ul, .legal ol { padding-left: 22px; }

.legal li { margin-bottom: 7px; }

.legal table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14.5px;
}

.legal th, .legal td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.legal th { background: var(--bg-soft); font-weight: 600; }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  padding: 14px 18px;
  margin: 20px 0;
  font-size: 14.5px;
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 48px;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  margin-bottom: 28px;
}

.footer-grid strong { color: var(--ink); }

.footer-links { display: flex; flex-direction: column; gap: 8px; }

.footer-links a { color: var(--ink-soft); text-decoration: none; }

.footer-links a:hover { color: var(--ink); }

.footer-note {
  border-top: 1px solid var(--line);
  padding-top: 20px;
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  justify-content: space-between;
}

/* ---------- responsive ---------- */

@media (max-width: 820px) {
  .grid-3 { grid-template-columns: 1fr; }
  .facts dl { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
  .hero { padding: 56px 0 48px; }
  section { padding: 48px 0; }
}