:root {
  --brand: #246bfd;
  --brand-dark: #1748b5;
  --ink: #172033;
  --muted: #5f6b7a;
  --line: #dfe5ef;
  --soft: #f4f7fc;
  --warn: #fff7e6;
  --warn-line: #f2c66d;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.75;
}
a { color: var(--brand-dark); text-underline-offset: 3px; }
a:hover { color: var(--brand); }
a:focus-visible { outline: 3px solid #ffbf47; outline-offset: 3px; }
.site-header { border-bottom: 1px solid var(--line); background: #fff; }
.site-header__inner,
.site-footer__inner,
.page { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header__inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { color: var(--ink); font-size: 20px; font-weight: 750; text-decoration: none; }
.nav { display: flex; flex-wrap: wrap; gap: 22px; }
.nav a { color: var(--muted); text-decoration: none; }
.breadcrumbs { margin: 26px 0 10px; color: var(--muted); font-size: 14px; }
.hero { padding: 42px 0 28px; }
.eyebrow { color: var(--brand-dark); font-weight: 700; letter-spacing: .04em; }
h1 { max-width: 900px; margin: 8px 0 18px; font-size: clamp(34px, 6vw, 56px); line-height: 1.18; }
h2 { margin: 42px 0 14px; font-size: clamp(24px, 4vw, 32px); line-height: 1.3; }
h3 { margin: 24px 0 8px; font-size: 21px; }
p { margin: 10px 0 18px; }
.lede { max-width: 820px; color: var(--muted); font-size: 20px; }
.answer,
.card,
.cta,
.warning { border-radius: 16px; padding: 24px; }
.answer { border-left: 5px solid var(--brand); background: #eef4ff; }
.answer strong { color: #0f3f9e; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.card { border: 1px solid var(--line); background: #fff; }
.card h2, .card h3 { margin-top: 0; }
.card__link { display: inline-block; font-weight: 700; }
.steps { padding-left: 24px; }
.steps li, .checklist li { margin-bottom: 12px; }
.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.fact { border: 1px solid var(--line); border-radius: 12px; padding: 18px; background: var(--soft); }
.fact b { display: block; margin-bottom: 4px; }
.warning { border: 1px solid var(--warn-line); background: var(--warn); }
.cta { margin: 42px 0; color: #fff; background: linear-gradient(135deg, var(--brand-dark), var(--brand)); }
.cta h2 { margin-top: 0; }
.cta p { margin-bottom: 8px; }
.source-list li { margin-bottom: 12px; word-break: break-word; }
.reviewed { color: var(--muted); font-size: 14px; }
.site-footer { margin-top: 64px; padding: 34px 0; color: #d8e2f1; background: #172033; }
.site-footer a { color: #fff; }
.site-footer p { margin: 4px 0; }

@media (max-width: 760px) {
  body { font-size: 16px; }
  .site-header__inner { align-items: flex-start; flex-direction: column; padding: 16px 0; }
  .nav { gap: 10px 18px; }
  .grid, .facts { grid-template-columns: 1fr; }
  .hero { padding-top: 28px; }
  .answer, .card, .cta, .warning { padding: 20px; }
}