/* ==========================================================================
   ARMATEURS CÔTIERS — Design System
   Portail de référence sur le transport maritime côtier français
   ========================================================================== */

/* --- Fonts (self-hosted, OFL license) --- */
@font-face {
  font-family: 'Source Serif 4';
  src: url('/assets/fonts/source-serif-4-latin-400-normal.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Source Serif 4';
  src: url('/assets/fonts/source-serif-4-latin-600-normal.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Source Serif 4';
  src: url('/assets/fonts/source-serif-4-latin-700-normal.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Source Sans 3';
  src: url('/assets/fonts/source-sans-3-latin-400-normal.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Source Sans 3';
  src: url('/assets/fonts/source-sans-3-latin-600-normal.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Source Sans 3';
  src: url('/assets/fonts/source-sans-3-latin-700-normal.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* --- Design Tokens --- */
:root {
  /* Primary palette — registre éditorial maritime */
  --color-primary: #2C3E50;
  --color-primary-light: #34698A;
  --color-primary-lighter: #EDF2F7;
  --color-primary-surface: #F0F4F8;

  /* Neutrals */
  --color-text: #1A1A2E;
  --color-text-secondary: #4A5568;
  --color-text-tertiary: #718096;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F9FC;
  --color-border: #E2E8F0;
  --color-border-strong: #CBD5E0;

  /* Accents */
  --color-accent: #2D6A4F;
  --color-accent-hover: #1B4D3E;
  --color-accent-light: #E8F5E9;

  /* Semantic */
  --color-info: #2B6CB0;
  --color-info-light: #EBF4FF;

  /* Typography */
  --font-heading: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Type scale (1.25 ratio) */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.563rem;
  --text-3xl: 1.953rem;
  --text-4xl: 2.441rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --max-width-content: 42rem;
  --max-width-wide: 56rem;
  --max-width-page: 72rem;
  --border-radius: 0.375rem;
  --border-radius-lg: 0.75rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* --- Reset --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary-light);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-accent);
}

/* --- Skip link (accessibility) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 1000;
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  text-decoration: none;
}
.skip-link:focus {
  top: 0;
}

/* --- Focus styles --- */
:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
  border-radius: 2px;
}

/* --- Layout containers --- */
.container {
  width: 100%;
  max-width: var(--max-width-page);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container--content {
  max-width: var(--max-width-content);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container--wide {
  max-width: var(--max-width-wide);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

/* =============================================
   HEADER & NAVIGATION
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width-page);
  margin-inline: auto;
  padding: var(--space-4) var(--space-5);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}
.site-logo__icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

/* Desktop nav */
.nav-main {
  display: none;
}
.nav-main__list {
  display: flex;
  gap: var(--space-1);
  list-style: none;
}
.nav-main__link {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-main__link:hover,
.nav-main__link[aria-current="page"] {
  color: var(--color-primary);
  background: var(--color-primary-lighter);
}

/* Mobile hamburger */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.nav-mobile {
  display: none;
  padding: var(--space-4) var(--space-5) var(--space-8);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}
.nav-mobile[data-open="true"] {
  display: block;
}
.nav-mobile__list {
  list-style: none;
}
.nav-mobile__link {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}
.nav-mobile__link:hover {
  color: var(--color-accent);
}

@media (min-width: 768px) {
  .nav-main { display: block; }
  .nav-toggle { display: none; }
  .nav-mobile { display: none !important; }
}

/* =============================================
   BREADCRUMB
   ============================================= */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  padding: var(--space-4) var(--space-5);
  max-width: var(--max-width-page);
  margin-inline: auto;
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}
.breadcrumb li:not(:last-child)::after {
  content: '›';
  margin-left: var(--space-1);
  color: var(--color-text-tertiary);
}
.breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
}
.breadcrumb a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* =============================================
   HERO (homepage)
   ============================================= */
.hero {
  padding: var(--space-20) var(--space-5) var(--space-16);
  background: linear-gradient(165deg, var(--color-primary) 0%, #0D2137 100%);
  color: #fff;
}
.hero__inner {
  max-width: var(--max-width-wide);
  margin-inline: auto;
}
.hero__tag {
  display: inline-block;
  margin-bottom: var(--space-4);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(14, 124, 107, 0.15);
  border: 1px solid rgba(14, 124, 107, 0.3);
  border-radius: 100px;
}
.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl));
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  max-width: 20ch;
}
.hero__lead {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  max-width: 50ch;
  margin-bottom: var(--space-8);
}
.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-6);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}
.hero__stat-value {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: 1;
  margin-bottom: var(--space-1);
}
.hero__stat-label {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.4;
}
.hero__stat-source {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.4);
  margin-top: var(--space-1);
}

/* =============================================
   SECTION BLOCKS
   ============================================= */
.section {
  padding: var(--space-16) var(--space-5);
}
.section--alt {
  background: var(--color-bg-alt);
}
.section__header {
  max-width: var(--max-width-wide);
  margin-inline: auto;
  margin-bottom: var(--space-10);
}
.section__tag {
  display: inline-block;
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.section__title {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-2xl), 3.5vw, var(--text-3xl));
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-primary);
}
.section__desc {
  margin-top: var(--space-3);
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 55ch;
}

/* =============================================
   CARD GRID
   ============================================= */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
  max-width: var(--max-width-page);
  margin-inline: auto;
}

.card {
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.card:hover {
  border-color: var(--color-primary-light);
  box-shadow: 0 4px 12px rgba(26, 58, 92, 0.08);
  color: inherit;
}
.card__icon {
  width: 40px;
  height: 40px;
  margin-bottom: var(--space-4);
  color: var(--color-accent);
}
.card__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-2);
  color: var(--color-primary);
}
.card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex-grow: 1;
}
.card__link-text {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
}
.card__link-text svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}
.card:hover .card__link-text svg {
  transform: translateX(3px);
}

/* =============================================
   ARTICLE PAGE
   ============================================= */
.article-header {
  padding: var(--space-12) var(--space-5) var(--space-8);
  max-width: var(--max-width-content);
  margin-inline: auto;
}
.article-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-primary);
}
.article-meta {
  margin-top: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

/* Article body — long-form reading */
.article-body {
  max-width: var(--max-width-content);
  margin-inline: auto;
  padding-inline: var(--space-5);
  font-size: var(--text-lg);
  line-height: 1.8;
}
.article-body h2 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}
.article-body h3 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}
.article-body p {
  margin-bottom: var(--space-5);
}
.article-body ul,
.article-body ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
}
.article-body li {
  margin-bottom: var(--space-2);
}
.article-body blockquote {
  margin: var(--space-8) 0;
  padding: var(--space-5) var(--space-6);
  border-left: 4px solid var(--color-accent);
  background: var(--color-accent-light);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  font-size: var(--text-base);
}
.article-body figure {
  margin: var(--space-8) 0;
}
.article-body figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  text-align: center;
}
.article-body table {
  width: 100%;
  margin: var(--space-6) 0;
  border-collapse: collapse;
  font-size: var(--text-base);
}
.article-body th {
  background: var(--color-primary-lighter);
  font-weight: 600;
  text-align: left;
}
.article-body th,
.article-body td {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
}
.article-body sup a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

/* Callout box */
.callout {
  margin: var(--space-8) 0;
  padding: var(--space-5) var(--space-6);
  background: var(--color-info-light);
  border-left: 4px solid var(--color-info);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
}
.callout__title {
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--color-info);
}

/* Sources section */
.article-sources {
  max-width: var(--max-width-content);
  margin-inline: auto;
  padding: var(--space-8) var(--space-5);
  margin-top: var(--space-8);
  border-top: 2px solid var(--color-border);
}
.article-sources h2 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}
.article-sources ol {
  list-style: none;
  padding-left: 0;
  counter-reset: sources;
}
.article-sources li {
  counter-increment: sources;
  position: relative;
  padding: var(--space-4) var(--space-5);
  padding-left: calc(var(--space-10) + var(--space-2));
  margin-bottom: var(--space-3);
  background: var(--color-bg-alt);
  border-left: 3px solid var(--color-border);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.7;
  transition: border-color var(--transition-fast);
}
.article-sources li:hover {
  border-left-color: var(--color-accent);
}
.article-sources li::before {
  content: counter(sources);
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-lighter);
  border-radius: 50%;
}
.article-sources cite {
  display: block;
  font-style: normal;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.article-sources li > a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-light);
  border-radius: 100px;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.article-sources li > a:hover {
  background: var(--color-accent);
  color: #fff;
}
/* Footnote superscript links in article body */
.article-body sup a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.2em;
  padding: 0 0.2em;
  font-size: 0.7em;
  font-weight: 700;
  color: #fff;
  background: var(--color-accent);
  border-radius: 3px;
  text-decoration: none;
  vertical-align: super;
  line-height: 1.4;
  transition: background var(--transition-fast);
}
.article-body sup a:hover {
  background: var(--color-accent-hover);
}

/* Related articles */
.related-articles {
  max-width: var(--max-width-content);
  margin-inline: auto;
  padding: var(--space-10) var(--space-5);
}
.related-articles h2 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}
.related-articles ul {
  list-style: none;
}
.related-articles li {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}
.related-articles a {
  font-weight: 600;
  color: var(--color-primary-light);
  text-decoration: none;
}
.related-articles a:hover {
  color: var(--color-accent);
}

/* =============================================
   CLUSTER INDEX PAGE
   ============================================= */
.cluster-hero {
  padding: var(--space-16) var(--space-5) var(--space-12);
  background: var(--color-primary-lighter);
}
.cluster-hero__inner {
  max-width: var(--max-width-wide);
  margin-inline: auto;
}
.cluster-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: var(--space-4);
}
.cluster-hero p {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 55ch;
  line-height: 1.7;
}

/* Article list within cluster */
.article-list {
  max-width: var(--max-width-wide);
  margin-inline: auto;
  padding: var(--space-10) var(--space-5);
}
.article-list__item {
  display: block;
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  color: inherit;
  transition: background var(--transition-fast);
}
.article-list__item:first-child {
  border-top: 1px solid var(--color-border);
}
.article-list__item:hover {
  color: inherit;
}
.article-list__item:hover .article-list__title {
  color: var(--color-accent);
}
.article-list__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
  transition: color var(--transition-fast);
}
.article-list__excerpt {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 60ch;
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
  padding: var(--space-10) var(--space-5);
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--text-sm);
}
.site-footer__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: var(--max-width-page);
  margin-inline: auto;
}
.site-footer__brand {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: #fff;
  margin-bottom: var(--space-2);
}
.site-footer__desc {
  max-width: 45ch;
  line-height: 1.6;
}
.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.site-footer__nav a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
}
.site-footer__nav a:hover {
  color: #fff;
}
.site-footer__copy {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.4);
}

@media (min-width: 768px) {
  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

/* =============================================
   404 PAGE
   ============================================= */
.page-404 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: var(--space-16) var(--space-5);
}
.page-404__code {
  font-family: var(--font-heading);
  font-size: 6rem;
  font-weight: 700;
  color: var(--color-border-strong);
  line-height: 1;
}
.page-404__title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  color: var(--color-primary);
  margin: var(--space-4) 0 var(--space-2);
}
.page-404__desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}
.page-404__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: background var(--transition-fast);
}
.page-404__link:hover {
  background: var(--color-primary-light);
  color: #fff;
}

/* =============================================
   UTILITIES
   ============================================= */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Print styles */
@media print {
  .site-header,
  .site-footer,
  .nav-toggle,
  .skip-link {
    display: none !important;
  }
  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}

/* Anchor scroll offset for sticky header */
[id^="src-"],
[id^="ref-"] {
  scroll-margin-top: 5rem;
}
/* Source backlink */
.source-backlink {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  margin-left: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-decoration: none;
  border-radius: 50%;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.source-backlink:hover {
  color: var(--color-primary);
  background: var(--color-primary-lighter);
}

/* =============================================
   HUB ARTICLES SECTION (on hub/index pages)
   ============================================= */
.hub-articles {
  margin-top: var(--space-12);
  padding-top: var(--space-10);
  border-top: 1px solid var(--color-border);
}
.hub-articles h2 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-6);
}