:root {
  --bg: #07111f;
  --panel: #0c1a2d;
  --panel-2: #10233b;
  --text: #f4f7fb;
  --muted: #b9c5d6;
  --soft: #8ea0b8;
  --line: rgba(185, 197, 214, 0.18);
  --gold: #f59e0b;
  --gold-dark: #d97706;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: var(--gold);
  text-decoration: none;
}

a:hover {
  color: #fbbf24;
}

.page-shell {
  max-width: 1040px;
  margin: 0 auto;
  padding: 28px 20px 76px;
}

.seo-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--gold);
  font-weight: 800;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

.navlinks {
  display: flex;
  gap: 20px;
  color: var(--muted);
  font-size: 14px;
}

.navlinks a {
  color: var(--muted);
}

.navlinks a:hover,
.navlinks a[aria-current="page"] {
  color: var(--gold);
}

.eyebrow {
  color: var(--gold);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin: 0 0 14px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(2.55rem, 7vw, 5rem);
  letter-spacing: 0;
  line-height: 0.96;
  margin: 0 0 22px;
  max-width: 920px;
}

.lead {
  color: #d7e0ee;
  font-size: clamp(1.08rem, 2.4vw, 1.38rem);
  max-width: 780px;
  margin: 0 0 24px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0 44px;
}

.cta {
  align-items: center;
  border-radius: 8px;
  display: inline-flex;
  font-weight: 800;
  min-height: 46px;
  padding: 12px 18px;
}

.cta.primary {
  background: var(--gold);
  color: #07111f;
}

.cta.secondary {
  border: 1px solid var(--line);
  color: var(--text);
}

.card-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 36px 0 18px;
}

.info-card,
.content-section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.info-card {
  padding: 18px;
}

.info-card h2 {
  font-size: 1.02rem;
  line-height: 1.2;
  margin: 0 0 8px;
}

.info-card p {
  color: var(--muted);
  margin: 0;
}

.content-section {
  margin-top: 18px;
  padding: clamp(20px, 4vw, 30px);
}

.content-section h2 {
  font-size: clamp(1.45rem, 3.4vw, 2.2rem);
  letter-spacing: 0;
  line-height: 1.08;
  margin: 0 0 12px;
}

.content-section p {
  color: var(--muted);
  margin: 0;
}

.source-box {
  background: var(--panel-2);
}

.source-box ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 20px;
}

.source-box li {
  color: var(--soft);
}

.faq-list details {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

.faq-list details:first-of-type {
  border-top: 0;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 800;
}

.faq-list p {
  margin-top: 8px;
}

.related-links div {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.related-links a {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.92rem;
  padding: 8px 12px;
}

.checklist-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.checklist-grid p {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 0;
  padding: 14px;
}

.challenge-table {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.challenge-table [role="row"] {
  display: grid;
  gap: 0;
  grid-template-columns: 0.6fr 1fr 2.4fr;
}

.challenge-table [role="row"] > * {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 12px;
}

.challenge-table [role="row"]:first-child > * {
  background: var(--panel-2);
  border-top: 0;
  color: var(--text);
}

.calculator-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  margin: 36px 0 18px;
  padding: clamp(18px, 4vw, 30px);
}

.calculator-inputs {
  display: grid;
  gap: 12px;
}

.calculator-inputs label {
  color: var(--muted);
  display: grid;
  gap: 6px;
  grid-template-columns: minmax(0, 1fr) 120px 70px;
  align-items: center;
}

.calculator-inputs input {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  font: inherit;
  min-height: 44px;
  padding: 8px 10px;
  width: 100%;
}

.calculator-inputs span {
  color: var(--soft);
  font-size: 0.9rem;
}

.calculator-results {
  display: grid;
  gap: 10px;
}

.calculator-results div {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 4px;
  padding: 14px;
}

.calculator-results span {
  color: var(--soft);
  font-size: 0.88rem;
}

.calculator-results strong {
  color: var(--text);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  line-height: 1.1;
}

@media (max-width: 780px) {
  .navlinks {
    display: none;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .checklist-grid {
    grid-template-columns: 1fr;
  }

  .challenge-table [role="row"] {
    grid-template-columns: 1fr;
  }

  .calculator-panel,
  .calculator-inputs label {
    grid-template-columns: 1fr;
  }
}