:root {
  --blue: #005eb8;
  --blue-dark: #003d78;
  --ink: #212b32;
  --muted: #4c6272;
  --line: #d8dde0;
  --page: #f7f9fa;
  --surface: #fff;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(33, 43, 50, 0.06), 0 8px 24px rgba(33, 43, 50, 0.06);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--blue-dark);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: #ffb81c;
  color: var(--ink);
  padding: 0.75rem 1rem;
  font-weight: 600;
  z-index: 20;
}
.skip-link:focus {
  left: 0;
}

.wrap {
  width: 100%;
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.wrap--wide {
  max-width: 52rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(1.4) blur(6px);
}

.site-header-inner {
  max-width: 52rem;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  margin-right: auto;
}

.site-header nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-header nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
}

.site-header nav a:hover,
.site-header nav a[aria-current='page'] {
  color: var(--blue);
}

.hero {
  padding: 2.5rem 0 1.5rem;
}

.kicker {
  color: var(--blue);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.8rem;
  margin: 0 0 0.5rem;
}

h1 {
  font-size: clamp(1.7rem, 5vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

.lede {
  color: var(--muted);
  font-size: 1.0625rem;
  margin: 0 0 1rem;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.hero-figure {
  margin: 1.5rem 0 0;
}

.hero-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  display: block;
}

.hero-figure figcaption {
  color: var(--muted);
  font-size: 0.875rem;
  margin-top: 0.5rem;
}

.prose {
  padding: 0 0 2rem;
}

.prose h2 {
  font-size: 1.35rem;
  line-height: 1.25;
  margin: 2rem 0 0.6rem;
}

.prose h3 {
  font-size: 1.05rem;
  margin: 1.4rem 0 0.4rem;
}

.prose p,
.prose li {
  max-width: 40rem;
}

.prose ul,
.prose ol {
  padding-left: 1.25rem;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.prose blockquote {
  margin: 1.25rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
  border-left: 4px solid var(--blue);
  color: var(--muted);
}

.sources {
  font-size: 0.95rem;
}

.faq {
  background: var(--surface);
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--line);
}

.faq h2 {
  font-size: 1.35rem;
  margin: 0 0 1rem;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  margin: 0 0 0.6rem;
  padding: 0.15rem 0.9rem;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.7rem 0;
}

.faq-item p {
  margin: 0 0 0.85rem;
  color: var(--muted);
}

.topic-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0 0;
}

.topic-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
}

.topic-nav a:hover,
.topic-nav a:focus-visible {
  border-color: var(--blue);
  color: var(--blue);
}

.topic-nav span {
  color: var(--muted);
  font-weight: 500;
}

.topic-group {
  margin: 0 0 2.25rem;
  scroll-margin-top: 4.5rem;
}

.topic-group h2 {
  font-size: 1.15rem;
  margin: 0 0 0.75rem;
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 0 0 3rem;
}

.article-list--grid {
  margin-bottom: 0;
}

@media (min-width: 720px) {
  .article-list--grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
}

.article-list li {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  margin: 0 0 1rem;
}

.article-list--grid li {
  margin: 0;
  height: 100%;
}

.article-list a {
  display: block;
  height: 100%;
  padding: 1.1rem 1.2rem;
  text-decoration: none;
  color: inherit;
}

.article-list h2,
.article-list h3 {
  font-size: 1.15rem;
  margin: 0 0 0.35rem;
  color: var(--blue);
}

.article-list .topic,
.topic-link {
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  text-decoration: none;
  margin: 0 0 0.4rem;
}

.article-list p {
  margin: 0;
  color: var(--muted);
}

.article-nav {
  padding: 0 0 3rem;
}

.article-nav-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .article-nav-row {
    grid-template-columns: 1fr 1fr;
  }
}

.article-nav-older,
.article-nav-newer {
  display: block;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
  color: inherit;
}

.article-nav-newer {
  text-align: right;
}

.article-nav .label {
  display: block;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.article-nav-all {
  text-align: center;
  margin: 1.25rem 0 0;
}

.article-nav-all a {
  font-weight: 700;
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.25rem 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}

.langs {
  display: flex;
  gap: 0.75rem;
  font-size: 0.875rem;
}

.langs[hidden] {
  display: none;
}