/* ── Header ──────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(26, 35, 126, 0.97);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(41, 182, 246, 0.2);
  box-shadow: var(--shadow-md);
}

.header-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-white);
  flex-shrink: 0;
}
.site-logo img { border-radius: var(--radius-sm); }
.logo-text {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, #81d4fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.site-logo:hover .logo-text {
  background: linear-gradient(135deg, #e3f2fd 0%, #29b6f6 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

/* Primary nav */
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  color: rgba(255,255,255,0.82);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
  border: 1px solid transparent;
}
.nav-link:hover, .nav-link:focus-visible {
  background: rgba(255,255,255,0.12);
  color: var(--color-white);
  text-decoration: none;
  border-color: rgba(41,182,246,0.3);
}
.nav-link--active {
  background: rgba(41, 182, 246, 0.18);
  color: var(--color-white);
  border-color: rgba(41, 182, 246, 0.45);
}
.nav-icon { font-size: 1.1em; line-height: 1; }

/* Hamburger */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: var(--radius-md);
  cursor: pointer;
  margin-left: auto;
  padding: 0;
  transition: border-color var(--transition-fast);
}
.menu-toggle:hover { border-color: rgba(41,182,246,0.6); }
.hamburger-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded="true"] .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .header-inner { padding: 0 var(--space-4); gap: var(--space-4); }
  .menu-toggle { display: flex; }
  .primary-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(21, 101, 192, 0.98);
    backdrop-filter: blur(8px);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-4);
    border-bottom: 1px solid rgba(41,182,246,0.2);
  }
  .primary-nav.is-open { display: flex; }
  .nav-link { justify-content: flex-start; padding: var(--space-3) var(--space-4); font-size: var(--font-size-base); }
}

/* ── Footer ──────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.75);
  padding: var(--space-12) var(--space-6) var(--space-8);
  margin-top: var(--space-16);
  border-top: 1px solid rgba(41,182,246,0.15);
}

.footer-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  gap: var(--space-8);
}

.footer-brand { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-white);
  text-decoration: none;
  font-weight: 700;
  font-size: var(--font-size-lg);
}
.footer-logo:hover { color: var(--color-accent-light); text-decoration: none; }
.footer-tagline { margin: 0; font-size: var(--font-size-sm); opacity: 0.65; }

.footer-nav { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-nav-heading {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.footer-nav-heading:hover {
  background: rgba(255,255,255,0.07);
  color: var(--color-accent-light);
  text-decoration: none;
}

.footer-copy {
  text-align: right;
  font-size: var(--font-size-sm);
  opacity: 0.5;
  margin: 0;
  align-self: end;
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .footer-nav { flex-direction: row; flex-wrap: wrap; }
  .footer-copy { text-align: left; }
}

/* ── Breadcrumbs ─────────────────────────────────────────────────────── */
.breadcrumbs-nav { margin-bottom: var(--space-6); }

.breadcrumbs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
}

.breadcrumb-item { display: flex; align-items: center; gap: var(--space-1); }

.breadcrumb-link {
  color: var(--color-primary-mid);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.breadcrumb-link:hover {
  background: var(--color-surface);
  color: var(--color-accent);
  text-decoration: none;
}
.breadcrumb-sep { color: var(--color-text-faint); font-size: 0.75em; }
.breadcrumb-current { color: var(--color-text-muted); font-weight: 500; padding: var(--space-1) var(--space-2); }

/* ── Card Grid ───────────────────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.card {
  display: flex;
  flex-direction: column;
  padding: var(--space-6);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
  text-decoration: none;
}
.card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 var(--space-3);
  line-height: var(--line-height-tight);
}
.card-desc { font-size: var(--font-size-sm); color: var(--color-text-muted); margin: 0 0 var(--space-4); flex: 1; }
.card-cta {
  margin-top: auto;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: gap var(--transition-fast);
}
.card:hover .card-cta { gap: var(--space-3); }

/* ── Article list (subcategory) ──────────────────────────────────────── */
.article-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.article-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: var(--space-5) var(--space-6);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition-fast);
}
.article-card:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
  background: #f0f8ff;
  text-decoration: none;
}
.article-card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 var(--space-2);
}
.article-card-desc { font-size: var(--font-size-sm); color: var(--color-text-muted); margin: 0; }
.article-card-cta {
  flex-shrink: 0;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
}

@media (max-width: 600px) {
  .article-card { flex-direction: column; align-items: flex-start; }
  .article-card-cta { margin-top: var(--space-2); }
}

/* ── Related content ─────────────────────────────────────────────────── */
.related-content {
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 2px solid var(--color-surface-alt);
}
.related-heading {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: var(--space-5);
}
.related-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--space-3); }
.related-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}
.related-link:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-accent);
  text-decoration: none;
}
.related-link-title { font-weight: 600; color: var(--color-primary-mid); }
.related-link-desc { font-size: var(--font-size-sm); color: var(--color-text-muted); }

/* ── Offline page ────────────────────────────────────────────────────── */
.offline-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  padding: var(--space-12) var(--space-6);
}