:root {
  --bg: #f7f9fc;
  --fg: #0f1729;
  --muted: #5b6b82;
  --card: #ffffff;
  --border: #e3e8f0;
  --primary: 199 89% 42%;
  --o: 199 89% 42%;
  --i: 3 74% 50%;
  --a: 152 58% 33%;
  --n: 260 52% 50%;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

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

.brand:hover {
  text-decoration: none;
}

.brand span {
  color: hsl(var(--primary));
}

.app-link {
  font-size: 14px;
  font-weight: 600;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 20px 72px;
}

.breadcrumb {
  font-size: 13px;
  color: var(--muted);
  margin: 14px 0 6px;
}

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

.breadcrumb .sep {
  opacity: 0.5;
  margin: 0 2px;
}

.breadcrumb [aria-current="page"] {
  color: var(--fg);
  font-weight: 600;
}

h1 {
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 10px 0 4px;
}

.subhead {
  color: var(--muted);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin: 0 0 20px;
}

.overview {
  font-size: 17px;
  margin: 0 0 8px;
}

section {
  margin: 32px 0;
}

.section-title {
  font-size: 20px;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

.section-title .count {
  font-size: 13px;
  color: var(--muted);
  font-weight: 500;
}

.pillars {
  display: grid;
  gap: 12px;
}

@media (min-width: 560px) {
  .pillars {
    grid-template-columns: 1fr 1fr;
  }
}

.pillar {
  border: 1px solid;
  border-radius: 12px;
  padding: 14px 16px;
}

.pillar h2 {
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  font-weight: 700;
  margin: 0 0 6px;
}

.pillar p {
  margin: 0;
  font-size: 15px;
  color: var(--fg);
}

.pillar.o {
  background: hsl(var(--o) / 0.08);
  border-color: hsl(var(--o) / 0.3);
}
.pillar.o h2 {
  color: hsl(var(--o));
}
.pillar.i {
  background: hsl(var(--i) / 0.08);
  border-color: hsl(var(--i) / 0.3);
}
.pillar.i h2 {
  color: hsl(var(--i));
}
.pillar.a {
  background: hsl(var(--a) / 0.08);
  border-color: hsl(var(--a) / 0.3);
}
.pillar.a h2 {
  color: hsl(var(--a));
}
.pillar.n {
  background: hsl(var(--n) / 0.08);
  border-color: hsl(var(--n) / 0.3);
}
.pillar.n h2 {
  color: hsl(var(--n));
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  padding: 14px 16px;
  margin-bottom: 10px;
}

.faq-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.faq-item p {
  margin: 0;
  color: var(--fg);
}

.related {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.related a {
  display: inline-block;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 6px 13px;
  font-size: 14px;
  color: var(--fg);
}

.related a:hover {
  border-color: hsl(var(--primary));
  color: hsl(var(--primary));
  text-decoration: none;
}

.cta {
  background: linear-gradient(135deg, hsl(var(--primary) / 0.08), hsl(var(--n) / 0.06));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
}

.cta p {
  margin: 0 0 10px;
}

.cta-note {
  font-size: 13px;
  color: var(--muted);
  margin-top: 12px !important;
}

.btn {
  display: inline-block;
  background: hsl(var(--primary));
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  margin: 4px 8px 0 0;
}

.btn:hover {
  text-decoration: none;
  opacity: 0.92;
}

.btn.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
}

.region-block {
  margin: 28px 0;
}

.hub-group {
  margin: 16px 0;
}

.hub-group h3 {
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 18px 0 8px;
}

.hub-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 4px 20px;
}

@media (min-width: 560px) {
  .hub-list {
    grid-template-columns: 1fr 1fr;
  }
}

.hub-list a {
  display: block;
  padding: 3px 0;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 20px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.site-footer p {
  margin: 4px 0;
}

.site-footer .copyright {
  opacity: 0.8;
  margin-top: 10px;
}

/* --- Long-form sections (attachments / facts) --- */
.attach {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
@media (min-width: 560px) {
  .attach {
    grid-template-columns: 1fr 1fr;
  }
}
.attach-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem 1rem;
}
.attach-item h3 {
  margin: 0 0 0.35rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.attach-item p {
  margin: 0;
  color: var(--fg);
}
.facts {
  margin: 0.5rem 0 0;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--card);
}
.facts .fact {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--border);
}
.facts .fact:first-child {
  border-top: 0;
}
.facts dt {
  font-weight: 600;
  color: var(--muted);
  font-size: 0.85rem;
}
.facts dd {
  margin: 0;
  color: var(--fg);
}