/* ====================================================
   FutureSEOTools — Header & Navigation Styles
   ==================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed, 300);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border, #e2e8f0);
  box-shadow: 0 1px 8px rgba(0,0,0,0.06);
  height: var(--header-height, 70px);
  transition: background 0.3s ease;
}
[data-theme="dark"] .site-header {
  background: rgba(15,23,42,0.97);
  border-bottom-color: var(--border, #334155);
}
.header-inner {
  display: flex;
  align-items: center;
  height: var(--header-height, 70px);
  gap: 24px;
}
.header-left { flex-shrink: 0; }
.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex-shrink: 0;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: -0.03em;
}
.site-logo .logo-icon { font-size: 1.4rem; }
.site-logo strong { color: var(--primary, #1e40af); }
.site-logo:hover { color: var(--text); }

/* ── Desktop Nav ── */
.desktop-nav { flex: 1; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm, 6px);
  white-space: nowrap;
  transition: all 0.15s ease;
}
.nav-link:hover, .nav-item.open > .nav-link { color: var(--primary, #1e40af); background: var(--primary-pale, #eff6ff); }
.nav-arrow { font-size: 0.65rem; opacity: 0.6; transition: transform 0.2s; }
.nav-item.open .nav-arrow { transform: rotate(180deg); }

/* ── Mega Menu ── */
.mega-menu {
  position: absolute;
  top: calc(var(--header-height, 70px) + 1px);
  left: 0;
  right: 0;
  background: var(--surface, #fff);
  border-bottom: 3px solid var(--primary, #1e40af);
  box-shadow: 0 16px 40px rgba(0,0,0,0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.2s ease;
  z-index: 200;
}
.nav-item.has-mega { position: static; }
.nav-item.open .mega-menu { opacity: 1; visibility: visible; transform: translateY(0); }
.mega-menu-inner {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  max-width: var(--container-max, 1280px);
  margin: 0 auto;
  padding: 28px 24px 20px;
  gap: 8px;
}
.mega-menu.mega-menu-sm .mega-menu-inner { grid-template-columns: repeat(3, 1fr); }
.mega-col { padding: 0 16px; }
.mega-col + .mega-col { border-left: 1px solid var(--border-light, #f1f5f9); }
.mega-col-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border, #e2e8f0);
}
.mega-col ul { list-style: none; }
.mega-col ul li { margin-bottom: 2px; }
.mega-col ul a {
  display: block;
  padding: 5px 6px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-xs, 4px);
  transition: all 0.15s;
}
.mega-col ul a:hover { color: var(--primary); background: var(--primary-pale, #eff6ff); }
.mega-menu-footer {
  border-top: 1px solid var(--border, #e2e8f0);
  padding: 12px 24px;
  text-align: center;
  background: var(--bg-secondary, #f8fafc);
}

/* ── Small Dropdown ── */
.nav-item.has-dropdown-sm { position: relative; }
.dropdown-sm {
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 180px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md, 12px);
  box-shadow: var(--shadow-md);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 200;
}
.nav-item.has-dropdown-sm.open .dropdown-sm { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.dropdown-sm a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.15s;
}
.dropdown-sm a:hover { background: var(--primary-pale); color: var(--primary); }

/* ── Header Actions ── */
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.15s;
  color: var(--text-secondary);
}
.icon-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-pale); }
.hamburger-btn { display: none; flex-direction: column; gap: 5px; padding: 10px; }
.hamburger-btn .bar { display: block; width: 20px; height: 2px; background: var(--text); border-radius: 2px; transition: all 0.2s; }
.hide-mobile { display: inline-flex; }

/* Header search */
.header-search-wrap { position: relative; }
.search-toggle-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.search-toggle-btn:hover { border-color: var(--primary); color: var(--primary); }
.search-label { display: none; }
@media (min-width: 1024px) { .search-label { display: inline; } }
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9998;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
}
.search-overlay-inner {
  display: flex;
  align-items: center;
  background: var(--surface);
  padding: 16px 24px;
  gap: 12px;
  box-shadow: var(--shadow-lg);
}
.search-overlay-inner input {
  flex: 1;
  padding: 14px 16px;
  font-size: 1.1rem;
  border: 2px solid var(--primary);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  outline: none;
}
.search-close {
  font-size: 1.2rem;
  color: var(--text-muted);
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}
.search-results-dropdown {
  background: var(--surface);
  max-height: 70vh;
  overflow-y: auto;
  border-top: 1px solid var(--border);
  padding: 8px;
}

/* ── Mobile Nav ── */
.mobile-nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 399;
  opacity: 0;
  transition: opacity 0.3s;
}
.mobile-nav-overlay.open { display: block; opacity: 1; }
.mobile-nav {
  position: fixed;
  top: 0;
  left: -100%;
  width: min(340px, 88vw);
  height: 100dvh;
  background: var(--surface);
  z-index: 400;
  overflow-y: auto;
  transition: left 0.3s cubic-bezier(0.4,0,0.2,1);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
}
.mobile-nav.open { left: 0; }
.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}
.mobile-nav-close {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mobile-nav-body { flex: 1; overflow-y: auto; padding: 16px; }
.mobile-search-wrap { margin-bottom: 16px; }
.mobile-search-wrap input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 0.9rem;
}
.mobile-nav-list { list-style: none; }
.mobile-nav-list a, .mobile-nav-link {
  display: block;
  padding: 10px 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 0.15s;
}
.mobile-nav-list a:hover, .mobile-nav-link:hover { color: var(--primary); background: var(--primary-pale); }
.mobile-nav-section {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 14px 12px 6px;
  margin-top: 6px;
  border-top: 1px solid var(--border-light);
}
body.nav-open { overflow: hidden; }

/* Scroll Top */
.scroll-top-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 200;
  cursor: pointer;
  border: none;
}
.scroll-top-btn.visible { opacity: 1; transform: translateY(0); }
.scroll-top-btn:hover { background: var(--primary-dark); transform: translateY(-2px); }

/* Dark mode */
[data-theme="dark"] .mega-menu,
[data-theme="dark"] .dropdown-sm { background: var(--surface); }

/* Responsive */
@media (max-width: 1024px) {
  .desktop-nav { display: none; }
  .hamburger-btn { display: flex; }
  .hide-mobile { display: none; }
}
@media (max-width: 640px) {
  .header-inner { gap: 8px; }
}