/* ============================================================
   Header, footer, nav, page-level structure
   ============================================================ */

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-paper);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: height var(--dur-mid) var(--ease), box-shadow var(--dur-mid) var(--ease), background var(--dur-mid) var(--ease);
}
.site-header.header--shrunk {
  height: var(--header-height-shrunk);
  box-shadow: var(--shadow-sm);
  background: rgba(250, 249, 246, 0.96);
  backdrop-filter: saturate(180%) blur(6px);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  width: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  white-space: nowrap;
}
.brand-logo {
  height: 63px;
  width: auto;
  display: block;
  transition: height var(--dur-mid) var(--ease);
}
.header--shrunk .brand-logo { height: 50px; }
.brand-sub {
  display: none;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-navy);
  letter-spacing: -0.005em;
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-border);
}
@media (min-width: 640px) { .brand-sub { display: inline-block; } }

.primary-nav {
  display: none;
  align-items: center;
  gap: var(--space-6);
  flex: 1;
  justify-content: center;
}
@media (min-width: 960px) { .primary-nav { display: flex; } }

.nav-link {
  position: relative;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  padding: var(--space-2) 0;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease);
}
.nav-link:hover::after, .nav-link.is-active::after { transform: scaleX(1); }
.nav-link.is-active { color: var(--color-navy); }

.nav-item-dropdown { position: relative; }
.mega-menu {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  width: min(760px, 90vw);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
  padding: var(--space-5);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2) var(--space-5);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-mid) var(--ease), transform var(--dur-mid) var(--ease), visibility var(--dur-mid);
}
.nav-item-dropdown:hover .mega-menu,
.nav-item-dropdown.is-open .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.mega-menu a {
  display: block;
  padding: var(--space-2) var(--space-2);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  border-radius: var(--radius);
}
.mega-menu a:hover { color: var(--color-accent); background: var(--color-gray-100); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.search-toggle {
  background: none;
  border: none;
  color: var(--color-text);
  display: inline-flex;
  align-items: center;
  padding: var(--space-2);
}
.search-toggle:hover { color: var(--color-accent); }

.nav-toggle {
  display: inline-flex;
  background: none;
  border: none;
  padding: var(--space-2);
}
@media (min-width: 960px) { .nav-toggle { display: none; } }

/* ---- Mobile nav drawer ---- */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: 200;
  visibility: hidden;
}
.mobile-nav.is-open { visibility: visible; }
.mobile-nav-backdrop {
  position: absolute; inset: 0;
  background: rgba(16, 26, 46, 0.5);
  opacity: 0;
  transition: opacity var(--dur-mid) var(--ease);
}
.mobile-nav.is-open .mobile-nav-backdrop { opacity: 1; }
.mobile-nav-panel {
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: min(320px, 84vw);
  background: var(--color-surface);
  padding: var(--space-6) var(--space-5);
  transform: translateX(100%);
  transition: transform var(--dur-mid) var(--ease);
  overflow-y: auto;
}
.mobile-nav.is-open .mobile-nav-panel { transform: translateX(0); }
.mobile-nav-close {
  background: none; border: none;
  margin-bottom: var(--space-5);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.mobile-nav-list a {
  display: block;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
  font-weight: 500;
}

/* ---- Search overlay ---- */
.search-overlay {
  position: fixed; inset: 0;
  z-index: 300;
  background: rgba(16, 26, 46, 0.55);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: min(18vh, 160px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-mid) var(--ease);
}
.search-overlay.is-open { opacity: 1; visibility: visible; }
.search-overlay-box {
  width: min(640px, 92vw);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
  padding: var(--space-5);
}
.search-overlay-box form {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 2px solid var(--color-navy);
  padding-bottom: var(--space-3);
}
.search-overlay-box input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1.25rem;
  background: transparent;
  color: var(--color-navy);
}
.search-overlay-close { background: none; border: none; color: var(--color-text-muted); }
.search-overlay-hint { margin-top: var(--space-3); font-size: var(--fs-small); color: var(--color-text-muted); }

/* ---- Footer ---- */
.site-footer {
  background: var(--color-navy);
  color: var(--color-text-inverse);
  padding-block: var(--space-8) var(--space-6);
}
.footer-grid {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}
@media (min-width: 760px) {
  .footer-grid { grid-template-columns: 1.3fr 1fr 1fr 1fr; }
}
.footer-brand { margin-bottom: var(--space-4); }
.footer-logo { height: 40px; width: auto; display: block; }
.footer-social { display: flex; gap: var(--space-3); margin-top: var(--space-5); }
.footer-social a {
  width: 34px; height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(244,244,242,0.2);
  border-radius: 50%;
  color: rgba(244,244,242,0.75);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.footer-social a:hover { color: #fff; border-color: #fff; background: rgba(244,244,242,0.08); }
.footer-social svg { width: 16px; height: 16px; }
.footer-col h4 {
  color: var(--color-text-inverse);
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
  font-weight: 600;
}
.footer-col p, .footer-col address { color: rgba(244,244,242,0.7); font-size: var(--fs-small); line-height: 1.7; font-style: normal; }
.footer-col ul li { margin-bottom: var(--space-2); }
.footer-col a { color: rgba(244,244,242,0.75); font-size: var(--fs-small); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(244,244,242,0.14);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: space-between;
  font-size: var(--fs-micro);
  color: rgba(244,244,242,0.55);
}

/* ---- Breadcrumb ---- */
.breadcrumb {
  padding-block: var(--space-4);
  font-size: var(--fs-small);
  color: var(--color-text-muted);
}
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb .sep { margin: 0 var(--space-2); color: var(--color-gray-300); }

/* ---- CTA band ---- */
.cta-band {
  background: var(--color-navy);
  color: var(--color-text-inverse);
  padding-block: var(--space-8);
  text-align: center;
}
.cta-band h2 { color: #fff; }
.cta-band p { color: rgba(244,244,242,0.75); margin-top: var(--space-3); }
.cta-band .btn-row { margin-top: var(--space-5); justify-content: center; }