:root {
  color-scheme: light;
  --blue: #2563eb;
  --orange: #f97316;
  --ink: #0f172a;
  --muted: #475569;
  --line: #dbe3ef;
  --soft: #f8fafc;
  --green: #16a34a;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--blue);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px 20px;
}

.brand {
  color: var(--ink);
  font-size: 20px;
  font-weight: 900;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 15px;
  font-weight: 700;
}

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

.hero {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, #eff6ff, #fff);
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 64px 20px;
}

.article-wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 64px 20px;
}

.eyebrow {
  color: var(--orange);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1 {
  max-width: 940px;
  margin: 12px 0 18px;
  font-size: clamp(42px, 7vw, 74px);
  line-height: 1;
  letter-spacing: 0;
}

h2 {
  margin: 44px 0 16px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.1;
  letter-spacing: 0;
}

h3 {
  margin: 28px 0 10px;
  font-size: 24px;
  line-height: 1.2;
}

p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 18px;
}

.lead {
  max-width: 780px;
  font-size: 22px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 900;
  text-decoration: none;
}

.button.primary {
  color: #fff;
  background: var(--blue);
}

.button.secondary {
  color: var(--blue);
  border: 2px solid var(--blue);
}

.toc {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: var(--soft);
}

.toc h2 {
  margin: 0 0 12px;
  font-size: 22px;
}

.toc ul,
.checklist,
.plain-list {
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  font-size: 18px;
}

li {
  margin: 9px 0;
}

.callout {
  margin: 34px 0;
  border-left: 5px solid var(--orange);
  border-radius: 8px;
  padding: 22px;
  background: #fff7ed;
}

.callout p {
  margin-bottom: 0;
  color: #7c2d12;
}

.step-grid,
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 24px 0 34px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: #fff;
}

.card h3 {
  margin-top: 0;
}

.card p {
  margin-bottom: 0;
}

.article-section {
  border-top: 1px solid var(--line);
  background: var(--soft);
}

.related-grid a {
  display: block;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  color: var(--ink);
  font-weight: 900;
  text-decoration: none;
  background: #fff;
}

.faq details {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  margin: 12px 0;
  background: #fff;
}

.faq summary {
  cursor: pointer;
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
}

.faq p {
  margin: 12px 0 0;
}

footer {
  border-top: 1px solid var(--line);
  padding: 28px 20px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 780px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .wrap,
  .article-wrap {
    padding: 46px 20px;
  }

  .step-grid,
  .related-grid {
    grid-template-columns: 1fr;
  }
}