/* ============================================================
   HEADER & NAVIGATION STYLES
   ============================================================ */

/* ─── HEADER ─────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  z-index: var(--z-sticky);
  background: rgba(248,250,252,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition-base);
}
[data-theme="dark"] .site-header {
  background: rgba(15,23,42,0.9);
}
.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ─── LOGO ───────────────────────────────────────────────── */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  text-decoration: none;
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 900;
  box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}
.logo-text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}
.logo-text span { color: var(--primary); }

/* ─── HEADER SEARCH ──────────────────────────────────────── */
.header-search {
  flex: 1;
  max-width: 440px;
  position: relative;
}
.header-search-input {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.75rem;
  background: var(--bg-muted);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  color: var(--text);
  outline: none;
  transition: all var(--transition-fast);
}
.header-search-input:focus {
  background: var(--bg-card);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.header-search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  pointer-events: none;
  width: 16px;
  height: 16px;
}
.header-search-shortcut {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 11px;
  color: var(--text-light);
  background: var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: monospace;
}

/* Search Dropdown */
.search-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  z-index: var(--z-dropdown);
  overflow: hidden;
  display: none;
}
.search-dropdown.show { display: block; animation: fadeInDown 0.2s ease; }
.search-dropdown-section { padding: var(--space-4); }
.search-dropdown-section + .search-dropdown-section {
  border-top: 1px solid var(--border);
}
.search-dropdown-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin-bottom: var(--space-2);
}
.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
  text-decoration: none;
  color: var(--text);
}
.search-result-item:hover, .search-result-item.active {
  background: var(--bg-muted);
}
.search-result-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.search-result-info { flex: 1; min-width: 0; }
.search-result-name {
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.search-result-cat {
  font-size: 11px;
  color: var(--text-muted);
}

/* ─── HEADER NAV ─────────────────────────────────────────── */
.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.nav-item {
  position: relative;
}
.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  background: none;
  border: none;
  font-family: inherit;
}
.nav-link:hover, .nav-link.active {
  color: var(--text);
  background: var(--bg-muted);
}
.nav-link svg { width: 14px; height: 14px; transition: transform var(--transition-fast); }
.nav-item:hover .nav-link svg { transform: rotate(180deg); }

/* Mega Menu / Dropdown */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  z-index: var(--z-dropdown);
  min-width: 220px;
  padding: var(--space-2);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(-8px);
  transition: all var(--transition-base);
}
.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
}
.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}
.nav-dropdown-item:hover {
  background: var(--bg-muted);
  color: var(--text);
}
.nav-dropdown-item-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}
.nav-dropdown-divider {
  height: 1px;
  background: var(--border);
  margin: var(--space-2) 0;
}

/* Mega menu (wide) */
.mega-menu {
  min-width: 680px;
  padding: var(--space-5);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-1);
}
.mega-menu-col {}
.mega-menu-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-light);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
}

/* ─── HEADER ACTIONS ─────────────────────────────────────── */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  margin-left: auto;
}
.icon-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: none;
}
.icon-btn:hover {
  background: var(--bg-muted);
  color: var(--text);
}
.icon-btn svg { width: 20px; height: 20px; }

/* ─── MOBILE MENU TOGGLE ─────────────────────────────────── */
.mobile-toggle {
  display: none;
  width: 38px;
  height: 38px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
  border: none;
  background: none;
  padding: 8px;
}
.mobile-toggle:hover { background: var(--bg-muted); }
.mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}
.mobile-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.mobile-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── MOBILE DRAWER ──────────────────────────────────────── */
.mobile-drawer {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-card);
  z-index: calc(var(--z-sticky) - 1);
  overflow-y: auto;
  transform: translateX(-100%);
  transition: transform var(--transition-base);
  padding: var(--space-5);
}
.mobile-drawer.open { transform: translateX(0); }

.mobile-nav-section { margin-bottom: var(--space-6); }
.mobile-nav-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-light);
  margin-bottom: var(--space-3);
  padding: 0 var(--space-2);
}
.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.mobile-nav-link:hover { background: var(--bg-muted); color: var(--text); }
.mobile-nav-icon { font-size: 20px; }

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .header-search { max-width: 280px; }
  .header-nav    { display: none; }
  .mobile-toggle { display: flex; }
}
@media (max-width: 768px) {
  .header-search { display: none; }
  .header-inner  { gap: var(--space-3); }
}
@media (max-width: 480px) {
  .header-actions .btn { display: none; }
}