.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: background var(--duration-base) var(--ease-standard), border-color var(--duration-base) var(--ease-standard), box-shadow var(--duration-base) var(--ease-standard);
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.96);
  border-bottom-color: var(--color-border);
  box-shadow: 0 2px 16px rgba(17, 24, 24, 0.05);
}

.header-inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo {
  height: 60px; width: auto;
  display: block;
  object-fit: contain;
}
.footer-brand-logo-wrap {
  display: inline-flex;
  background: #fff;
  padding: 12px 18px;
  border-radius: var(--radius-md);
}
@media (max-width: 640px) {
  .brand-logo { height: 46px; }
}

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav > ul { display: flex; align-items: center; gap: 2px; }
.nav-item { position: relative; }
.nav-link {
  display: flex; align-items: center; gap: 5px;
  padding: 10px 15px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast) var(--ease-standard), background var(--duration-fast) var(--ease-standard);
}
.nav-link:hover { color: var(--color-primary-dark); background: var(--color-bg-soft); }
.nav-link svg { width: 15px; height: 15px; transition: transform var(--duration-fast) var(--ease-standard); }
.nav-item.is-open .nav-link svg { transform: rotate(180deg); }

.header-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.header-actions .btn { padding: 11px 20px; font-size: 14.5px; }
.hide-mobile { display: inline-flex; }
.hamburger { display: none; }

/* Mega menu */
.mega-menu {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: min(880px, 90vw);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 36px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-standard), transform var(--duration-base) var(--ease-standard), visibility var(--duration-base);
  z-index: 90;
}
.nav-item.is-open .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.mega-menu-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.1fr;
  gap: 40px;
}
.mega-col-title {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: 16px;
}
.mega-col ul { display: flex; flex-direction: column; gap: 3px; }
.mega-col a {
  display: block;
  padding: 9px 10px;
  margin-inline: -10px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  transition: background var(--duration-fast), color var(--duration-fast);
}
.mega-col a:hover { background: var(--color-primary-tint); color: var(--color-primary-dark); }

.mega-feature {
  background: var(--color-dark);
  border-radius: var(--radius-md);
  padding: 26px;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 190px;
  position: relative;
  overflow: hidden;
}
.mega-feature::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% -10%, rgba(8,127,109,0.55), transparent 60%);
}
.mega-feature * { position: relative; }
.mega-feature h4 { color: #fff; font-size: 19px; margin-bottom: 8px; }
.mega-feature p { color: var(--color-dark-muted); font-size: 14px; margin-bottom: 18px; }
.mega-feature .link-arrow { color: #5fd3bd; font-size: 14.5px; }

/* Mobile drawer */
.mobile-drawer {
  position: fixed;
  inset: 0;
  z-index: 200;
  visibility: hidden;
}
.mobile-drawer.is-open { visibility: visible; }
.mobile-drawer-backdrop {
  position: absolute; inset: 0;
  background: rgba(17,24,24,0.45);
  opacity: 0;
  transition: opacity var(--duration-base) var(--ease-standard);
}
.mobile-drawer.is-open .mobile-drawer-backdrop { opacity: 1; }
.mobile-drawer-panel {
  position: absolute;
  top: 0; right: 0;
  width: min(400px, 88vw);
  height: 100%;
  background: #fff;
  transform: translateX(100%);
  transition: transform var(--duration-base) var(--ease-standard);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.mobile-drawer.is-open .mobile-drawer-panel { transform: translateX(0); }
.mobile-drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px var(--pad-inline);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}
.mobile-drawer-close {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-bg-soft);
  border: none;
}
.mobile-drawer-body { padding: 12px var(--pad-inline) 28px; flex: 1; }
.mobile-accordion-item { border-bottom: 1px solid var(--color-border); }
.mobile-accordion-trigger {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 4px;
  background: none; border: none;
  font-size: 16.5px; font-weight: 600;
  color: var(--color-text);
  text-align: left;
}
.mobile-accordion-trigger svg { width: 18px; height: 18px; transition: transform var(--duration-fast) var(--ease-standard); flex-shrink: 0; }
.mobile-accordion-item.is-open .mobile-accordion-trigger svg { transform: rotate(180deg); }
.mobile-accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-base) var(--ease-standard);
}
.mobile-accordion-item.is-open .mobile-accordion-panel { max-height: 900px; }
.mobile-accordion-panel ul { padding: 2px 4px 16px; display: flex; flex-direction: column; gap: 2px; }
.mobile-accordion-panel a {
  display: block; padding: 11px 12px; margin-inline: -12px;
  border-radius: var(--radius-sm);
  font-size: 15px; color: var(--color-text-muted);
}
.mobile-accordion-panel a:hover { background: var(--color-bg-soft); color: var(--color-primary-dark); }
.mobile-nav-flat a {
  display: block;
  padding: 16px 4px;
  border-bottom: 1px solid var(--color-border);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--color-text);
}
.mobile-drawer-cta { padding: 20px 4px 8px; display: flex; flex-direction: column; gap: 10px; }

@media (max-width: 1140px) {
  .main-nav { display: none; }
  .hide-mobile { display: none; }
  .hamburger {
    display: flex; align-items: center; justify-content: center;
    width: 42px; height: 42px;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--color-border);
    background: #fff;
  }
  .hamburger svg { width: 20px; height: 20px; }
}

.mobile-bottom-cta {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 80;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--color-border);
  display: none;
}
@media (max-width: 720px) { .mobile-bottom-cta { display: block; } body { padding-bottom: 76px; } }