/* Header Styles */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--background-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.site-header.scrolled {
    box-shadow: var(--shadow-medium);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

.main-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    min-height: 70px;
}

/* Brand/Logo */
.nav-brand {
    flex-shrink: 0;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: var(--font-size-xl);
}

.brand-logo {
    transition: transform var(--transition-fast);
}

.brand-link:hover .brand-logo {
    transform: scale(1.05);
}

.brand-text {
    color: var(--text-primary);
}

/* Desktop Navigation */
.nav-menu {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
}

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

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

.nav-link:hover::after {
    width: 100%;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-toggle::after {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: var(--spacing-xs);
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid currentColor;
    transition: transform var(--transition-fast);
}

.dropdown:hover .dropdown-toggle::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background-color: var(--background-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-large);
    padding: var(--spacing-sm) 0;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 1001;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.dropdown-link:hover {
    background-color: var(--background-secondary);
    color: var(--primary-color);
}

/* Action Buttons */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 30px;
    height: 30px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger-line {
    width: 20px;
    height: 2px;
    background-color: var(--text-primary);
    transition: all var(--transition-fast);
    margin: 2px 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--background-primary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-medium);
    padding: var(--spacing-lg) 0;
    transform: translateY(-100%);
    opacity: 0;
    transition: all var(--transition-normal);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav-item {
    border-bottom: 1px solid var(--border-color);
}

.mobile-nav-item:last-child {
    border-bottom: none;
}

.mobile-nav-link {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.mobile-nav-link:hover {
    background-color: var(--background-secondary);
    color: var(--primary-color);
}

.mobile-nav-actions {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-md);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu,
    .nav-actions {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .main-nav {
        padding: var(--spacing-sm) 0;
        min-height: 60px;
    }
    
    .brand-link {
        font-size: var(--font-size-lg);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .brand-text {
        display: none;
    }
}

/* Active page indicator */
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    width: 100%;
}

/* Accessibility */
.mobile-menu-toggle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.nav-link:focus,
.dropdown-link:focus,
.mobile-nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Animation for page load */
.site-header {
    animation: slideDown 0.6s ease-out;
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
    }
    to {
        transform: translateY(0);
    }
}