/* Sticky Header */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: rgba(15, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

/* Logo */
.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #a399ff 0%, #ff9e9e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo svg {
  fill: url(#logo-grad);
  width: 28px;
  height: 28px;
}

/* Desktop Navigation */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
  height: 100%;
}

.nav-item {
  height: 100%;
  display: flex;
  align-items: center;
  position: relative;
}

.nav-link {
  font-family: var(--font-display);
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
  transform: scaleX(0);
  transition: var(--transition);
}

.nav-link.active::after,
.nav-link:hover::after {
  transform: scaleX(1);
}

/* Mega Menu Dropdown */
.has-mega-menu {
  position: static;
}

.mega-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.has-mega-menu:hover .mega-menu,
.has-mega-menu:focus-within .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega-menu-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-height: 420px;
  overflow-y: auto;
}

@media (max-width: 1024px) {
  .mega-menu-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.mega-menu-item {
  display: flex;
  gap: 1rem;
  padding: 0.75rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.mega-menu-item:hover {
  background-color: rgba(91, 75, 237, 0.1);
}

.mega-menu-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.mega-menu-item:hover .mega-menu-icon {
  background: var(--primary);
  color: var(--text-primary);
}

.mega-menu-info h4 {
  font-size: 0.9375rem;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.mega-menu-info span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Header Right Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.search-toggle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  transition: var(--transition);
}

.search-toggle:hover {
  background-color: var(--bg-surface);
  border-color: var(--text-muted);
}

/* Hamburger Toggle Button */
.hamburger-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  z-index: 105;
}

.hamburger-line {
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition);
}

.hamburger-toggle.active .hamburger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.hamburger-toggle.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger-toggle.active .hamburger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Navigation Menu Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 300px;
  height: 100%;
  background-color: var(--bg-card);
  border-right: 1px solid var(--border);
  z-index: 110;
  padding: 5rem 1.5rem 2rem;
  transform: translateX(-100%);
  transition: transform 0.3s ease-in-out;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  overflow-y: auto;
}

.mobile-nav-drawer.active {
  transform: translateX(0);
}

.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 109;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.mobile-nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  list-style: none;
}

.mobile-nav-link {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  display: block;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.mobile-nav-link.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* Hide on mobile breakpoints */
@media (max-width: 900px) {
  .nav-menu {
    display: none;
  }
  .hamburger-toggle {
    display: flex;
  }
  .header-actions .btn {
    display: none;
  }
}