/* Enhanced Navigation with University Branding */
.main-navigation {
    background: #ffffff;
    box-shadow: var(--shadow-md);
    border-bottom: none;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    width: 100%;
    max-width: none;
    margin: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--space-6);
    height: 90px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-right: calc(-1 * var(--space-4));
}

.nav-left {
    display: flex;
    align-items: center;
    gap: var(--space-5);
}

/* University Logos & Portal Branding */

.nav-uni-logos {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0;
    margin-left: calc(-1 * var(--space-4));
}

/* Vertical separator after logos */
.nav-uni-logos::after {
    content: '';
    width: 1px;
    height: 32px;
    background: var(--gray-400);
    opacity: 0.6;
    margin-left: var(--space-5);
}

.nav-uni-logo {
    height: 32px;
    width: auto;
    max-width: 80px;
    object-fit: contain;
    opacity: 0.85;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.nav-uni-logo:hover {
    opacity: 1;
    transform: translateY(-1px);
    filter: brightness(1.1);
}

.nav-portal-brand .brand-link {
    text-decoration: none;
    color: inherit;
}

.nav-portal-name {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.2;
    margin: 0;
}

.nav-program-name {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    font-weight: var(--font-medium);
    letter-spacing: 0.3px;
    text-transform: uppercase;
    opacity: 0.8;
    margin: 0;
}

/* Hide old brand */
.nav-brand {
    display: none;
}

/* Enhanced Navigation Menu */
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

/* Navigation separator */
.nav-separator {
    width: 1px;
    height: 24px;
    background: var(--gray-400);
    opacity: 0.6;
}

/* Authenticated user links section */
.nav-auth-links {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-5);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    padding: var(--space-2) var(--space-3);
    transition: all var(--transition-fast);
    position: relative;
}

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

.nav-link.active {
    color: var(--primary);
    font-weight: var(--font-semibold);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

.nav-link-dashboard {
    color: var(--secondary) !important;
    font-weight: var(--font-semibold);
}

.nav-link-primary {
    color: var(--primary) !important;
    font-weight: var(--font-semibold);
}

/* Enhanced Auth Section */
.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-researcher-label {
    font-size: 11px;
    color: var(--text-tertiary);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    opacity: 0.7;
    margin-right: var(--space-4);
}

.nav-button {
    background: var(--primary);
    color: white;
    text-decoration: none;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-lg);
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.nav-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: left 0.3s ease;
}

.nav-button:hover {
    background: #0056CC;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.nav-button:hover::before {
    left: 100%;
}

/* Enhanced User Dropdown */
.nav-user {
    position: relative;
}

.user-dropdown {
    position: relative;
}

.user-button {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.user-button:hover {
    background: var(--gray-50);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-bold);
    font-size: var(--text-sm);
    flex-shrink: 0;
}

.user-name {
    color: var(--text-primary);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-button svg {
    color: var(--text-secondary);
    transition: transform var(--transition-fast);
}

.user-dropdown.active .user-button svg {
    transform: rotate(180deg);
}

/* Enhanced Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    min-width: 260px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 1000;
    overflow: hidden;
}

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

.dropdown-header {
    padding: var(--space-4);
    background: var(--gray-50);
}

.user-info .user-name {
    font-weight: var(--font-bold);
    font-size: var(--text-base);
    max-width: none;
    margin-bottom: var(--space-1);
    color: var(--text-primary);
}

.user-email {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    margin-bottom: var(--space-1);
}

.user-role {
    color: var(--primary);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.dropdown-divider {
    height: 1px;
    background: var(--border-light);
    margin: 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    transition: background-color var(--transition-fast);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
}

.dropdown-item:hover {
    background: var(--gray-50);
}

.dropdown-item svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.logout-btn:hover {
    background: #FEF2F2;
    color: var(--error);
}

.logout-btn:hover svg {
    color: var(--error);
}




/* Focus styles for accessibility */
.nav-link:focus-visible,
.nav-button:focus-visible,
.user-button:focus-visible,
.dropdown-item:focus-visible,
.mobile-menu-toggle:focus-visible,
.mobile-nav-link:focus-visible,
.mobile-nav-button:focus-visible,
.mobile-logout-btn:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 3px;
    box-shadow: var(--shadow-focus);
}

/* Active page indicator */
.nav-link[aria-current="page"] {
    color: var(--primary);
    font-weight: var(--font-semibold);
}

/* =================================
   MOBILE NAVIGATION
   ================================= */

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    padding: 12px;
    background: white;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    z-index: 100;
}

.mobile-menu-toggle:hover {
    background: var(--gray-50);
    border-color: var(--gray-400);
}

.mobile-menu-toggle:active {
    background: var(--gray-100);
    transform: scale(0.95);
}

/* Hamburger & Close Icons */
.icon-hamburger,
.icon-close {
    color: var(--text-primary);
    transition: transform 0.2s ease;
}

.icon-close {
    display: none;
}

.mobile-menu-toggle[aria-expanded="true"] .icon-hamburger {
    display: none;
}

.mobile-menu-toggle[aria-expanded="true"] .icon-close {
    display: block;
}

/* Mobile Navigation Dropdown */
.mobile-nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    z-index: 99;
}

.mobile-nav-dropdown.active {
    max-height: 500px;
}

.mobile-nav-content {
    padding: var(--space-4) 0;
}

/* Mobile Navigation Links */
.mobile-nav-links {
    margin-bottom: 0;
}

.mobile-nav-link {
    display: block;
    padding: var(--space-4) var(--space-6);
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    border-radius: 0;
    transition: all 0.2s ease;
    margin-bottom: 0;
    border-bottom: 1px solid var(--border-light);
}

.mobile-nav-link:hover {
    background: var(--gray-50);
    color: var(--primary);
}

.mobile-nav-link:last-child {
    margin-bottom: 0;
}

.mobile-nav-link-primary {
    color: var(--primary) !important;
    font-weight: var(--font-semibold);
}

.mobile-nav-link-secondary {
    color: var(--secondary) !important;
    font-weight: var(--font-semibold);
}

/* Mobile Navigation Separator */
.mobile-nav-separator {
    height: 1px;
    background: var(--border-light);
    margin: var(--space-2) 0;
}

.mobile-auth-label {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: var(--space-4) var(--space-6) var(--space-2);
    margin-bottom: var(--space-1);
}

/* Mobile User Section */
.mobile-nav-user {
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-light);
}

.mobile-user-info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    padding: var(--space-3);
    background: var(--gray-50);
    border-radius: var(--radius-lg);
}

.mobile-user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: var(--font-bold);
    font-size: var(--text-sm);
    flex-shrink: 0;
}

.mobile-user-details {
    flex: 1;
}

.mobile-user-name {
    font-weight: var(--font-semibold);
    font-size: var(--text-base);
    color: var(--text-primary);
    margin-bottom: 2px;
}

.mobile-user-role {
    font-size: var(--text-xs);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: var(--font-medium);
}

.mobile-logout-btn {
    width: 100%;
    background: var(--error);
    color: white;
    border: none;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.mobile-logout-btn:hover {
    background: #DC2626;
    transform: translateY(-1px);
}

/* Mobile Responsive Breakpoints */
@media (max-width: 768px) {
    /* Show mobile toggle on mobile */
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Hide desktop menu on mobile */
    .nav-menu {
        display: none;
    }
    
    /* Mobile nav container adjustments */
    .nav-container {
        height: 64px;
        padding: 0 var(--space-4);
        position: relative;
    }

    .nav-right {
        margin-right: 0;
    }
    
    /* Adjust navigation left section for mobile */
    .nav-left {
        gap: var(--space-3);
    }
    
    .nav-uni-logos {
        gap: var(--space-2);
        padding: 4px 8px;
    }
    
    .nav-uni-logos::after {
        display: none;
    }
    
    .nav-uni-logo {
        height: 24px;
        max-width: 60px;
    }
    
    .nav-portal-name {
        font-size: var(--text-lg);
    }
    
    .nav-program-name {
        font-size: 10px;
    }
}

@media (max-width: 480px) {
    /* Hide university logos on very small screens */
    .nav-uni-logos {
        display: none;
    }
    
    /* Smaller navigation container */
    .nav-container {
        padding: 0 var(--space-3);
    }
    
    /* Smaller mobile menu toggle */
    .mobile-menu-toggle {
        width: 44px;
        height: 44px;
        padding: 10px;
    }
    
    /* Adjust mobile dropdown content */
    .mobile-nav-content {
        padding: var(--space-3) var(--space-4);
    }
}