/* ============================================================
   HEADER, NAVIGATION, MEGA-MENU, MOBILE NAV & FOOTER
   ============================================================ */

/* ---- Site Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--header-height);
  transition: box-shadow var(--duration-normal) var(--ease-out);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; max-width: var(--container-wide);
  margin-inline: auto; padding-inline: var(--sp-6);
}

/* Logo */
.site-logo { display: flex; align-items: center; flex-shrink: 0; }
.site-logo img { height: 52px; width: auto; }
.site-logo__text {
  font-family: var(--font-sans); font-size: var(--text-lg);
  font-weight: 700; color: var(--color-primary);
  letter-spacing: var(--tracking-tight); line-height: 1.15;
  text-transform: uppercase;
}
.site-logo__text span { display: block; }

/* Primary Navigation */
.primary-nav { display: flex; align-items: center; gap: var(--sp-1); }
.primary-nav__link {
  display: inline-flex; align-items: center; gap: var(--sp-1);
  padding: var(--sp-2) var(--sp-4); font-size: var(--text-sm);
  font-weight: 500; color: var(--color-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
  position: relative; white-space: nowrap;
}
.primary-nav__link:hover,
.primary-nav__link:focus-visible,
.primary-nav__link[aria-expanded="true"] {
  color: var(--color-primary); background: rgba(20, 43, 94, 0.04);
}
/* Active page indicator */
.primary-nav__link[aria-current="page"] {
  color: var(--color-accent); position: relative;
}
.primary-nav__link[aria-current="page"]::after {
  content: ''; position: absolute; bottom: -2px;
  left: var(--sp-3); right: var(--sp-3); height: 2px;
  background: var(--color-accent); border-radius: 1px;
}
.primary-nav__link svg {
  width: 12px; height: 12px;
  transition: transform var(--duration-fast) var(--ease-out);
}
.primary-nav__link[aria-expanded="true"] svg { transform: rotate(180deg); }

/* Header Actions */
.header-actions { display: flex; align-items: center; gap: var(--sp-3); flex-shrink: 0; }

/* Mobile Toggle */
.mobile-toggle {
  display: none; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: var(--radius-sm); color: var(--color-primary);
}
.mobile-toggle:hover { background: rgba(20, 43, 94, 0.04); }
.mobile-toggle svg { width: 24px; height: 24px; }

/* ---- Conditions Mega-Menu (3-Column) ---- */
.mega-menu {
  position: absolute; top: var(--header-height); left: 0; right: 0;
  background: var(--glass-bg-strong);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-lg); padding: var(--sp-8) 0;
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: all var(--duration-normal) var(--ease-out);
  z-index: 999;
}
.mega-menu.active { opacity: 1; visibility: visible; transform: translateY(0); }
.mega-menu__inner {
  max-width: var(--container-wide); margin-inline: auto;
  padding-inline: var(--sp-6);
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-8);
}
.mega-menu__label {
  font-size: var(--text-xs); font-weight: 700;
  text-transform: uppercase; letter-spacing: var(--tracking-caps);
  color: var(--color-muted); margin-bottom: var(--sp-4);
  padding-bottom: var(--sp-2); border-bottom: 1px solid var(--color-border-light);
}
.mega-menu__label a {
  color: var(--color-muted);
  transition: color var(--duration-fast) var(--ease-out);
}
.mega-menu__label a:hover { color: var(--color-accent); }
.mega-menu__list { display: flex; flex-direction: column; gap: var(--sp-1); }
.mega-menu__item a {
  display: flex; align-items: center; gap: var(--sp-3);
  padding: var(--sp-2) var(--sp-3); border-radius: var(--radius-sm);
  font-size: var(--text-sm); color: var(--color-secondary);
  transition: all var(--duration-fast) var(--ease-out);
}
.mega-menu__item a:hover { background: rgba(58, 120, 212, 0.06); color: var(--color-accent); }
.mega-menu__item a svg { width: 18px; height: 18px; flex-shrink: 0; color: var(--color-muted); }
.mega-menu__item a:hover svg { color: var(--color-accent); }

/* ---- Footer ---- */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--sp-16) 0 var(--sp-8);
}
.footer__grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: var(--sp-10); margin-bottom: var(--sp-12);
}
.footer__brand p {
  font-size: var(--text-sm); line-height: var(--leading-relaxed);
  max-width: 320px; margin-top: var(--sp-4);
}
.footer__brand .site-logo__text { color: var(--color-white); font-size: var(--text-base); }
.footer__logo { display: block; height: 52px; width: auto; filter: brightness(0) invert(1); opacity: 0.9; margin-bottom: var(--sp-2); }
.footer__heading {
  font-size: var(--text-xs); font-weight: 700;
  text-transform: uppercase; letter-spacing: var(--tracking-caps);
  color: rgba(255, 255, 255, 0.5); margin-bottom: var(--sp-4);
}
.footer__links { display: flex; flex-direction: column; gap: var(--sp-2); }
.footer__links a {
  font-size: var(--text-sm); color: rgba(255, 255, 255, 0.7);
  transition: color var(--duration-fast) var(--ease-out);
}
.footer__links a:hover { color: var(--color-white); }
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--sp-6); display: flex; align-items: center;
  justify-content: space-between; flex-wrap: wrap; gap: var(--sp-4);
  font-size: var(--text-xs); color: rgba(255, 255, 255, 0.4);
}
.footer__bottom a { color: rgba(255, 255, 255, 0.5); }
.footer__bottom a:hover { color: var(--color-white); }
.footer__legal { display: flex; gap: var(--sp-4); flex-wrap: wrap; }

/* ---- Mobile Responsive ---- */
@media (max-width: 1024px) {
  .primary-nav { display: none; }
  .mobile-toggle { display: flex; }
  .mega-menu__inner { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .site-header__inner { padding-inline: var(--sp-4); }
  .site-logo img { height: 40px; }
  .header-actions .btn span.hide-mobile { display: none; }
  .mega-menu__inner { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__legal { flex-direction: column; gap: var(--sp-2); }
}

/* ---- Mobile Nav Overlay ---- */
.mobile-nav {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  z-index: 2000; background: rgba(13, 27, 42, 0.5);
  opacity: 0; visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}
.mobile-nav.active { opacity: 1; visibility: visible; }
.mobile-nav__panel {
  position: absolute; top: 0; right: 0; bottom: 0;
  width: min(360px, 85vw); background: var(--color-white);
  box-shadow: var(--shadow-xl); padding: var(--sp-6);
  transform: translateX(100%);
  transition: transform var(--duration-slow) var(--ease-out);
  overflow-y: auto;
}
.mobile-nav.active .mobile-nav__panel { transform: translateX(0); }
.mobile-nav__header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: var(--sp-6); padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--color-border-light);
}
.mobile-nav__close {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); color: var(--color-muted);
}
.mobile-nav__close:hover { background: var(--color-surface); color: var(--color-primary); }
.mobile-nav__links { display: flex; flex-direction: column; gap: var(--sp-1); }
.mobile-nav__links a {
  display: block; padding: var(--sp-3) var(--sp-4);
  font-size: var(--text-base); font-weight: 500;
  color: var(--color-secondary); border-radius: var(--radius-sm);
}
.mobile-nav__links a:hover { background: var(--color-surface); color: var(--color-primary); }
.mobile-nav__section {
  margin-top: var(--sp-4); padding-top: var(--sp-4);
  border-top: 1px solid var(--color-border-light);
}
.mobile-nav__section-title {
  font-size: var(--text-xs); font-weight: 700;
  text-transform: uppercase; letter-spacing: var(--tracking-caps);
  color: var(--color-muted); margin-bottom: var(--sp-2); padding-inline: var(--sp-4);
}