:root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --nav-border: rgba(102, 126, 234, 0.15);
            --nav-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
            --nav-text: #2d3748;
            --nav-text-hover: #1a202c;
            --nav-hover: rgba(102, 126, 234, 0.12);
            --nav-active: rgba(102, 126, 234, 0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-link-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
            --nav-link-glow: 0 0 0 2px rgba(102, 126, 234, 0.15);
            
            /* Light mode variables */
            --nav-bg: rgba(255, 255, 255, 0.98);
            --body-bg: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            --text-primary: #2d3748;
            --text-secondary: #4a5568;
            --card-bg: #ffffff;
            --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --border-color: rgba(0, 0, 0, 0.1);
            --section-bg: transparent;
        }

        [data-bs-theme="dark"] {
            /* Dark mode variables */
            --nav-bg: rgba(15, 23, 42, 0.95);
            --body-bg: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            --nav-text: #e2e8f0;
            --nav-text-hover: #f8fafc;
            --nav-hover: rgba(102, 126, 234, 0.2);
            --nav-active: rgba(102, 126, 234, 0.25);
            --nav-border: rgba(102, 126, 234, 0.2);
            --nav-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            --text-primary: #f1f5f9;
            --text-secondary: #cbd5e1;
            --card-bg: rgba(30, 41, 59, 0.7);
            --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
            --border-color: rgba(255, 255, 255, 0.1);
            --section-bg: rgba(15, 23, 42, 0.5);
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: var(--body-bg);
            min-height: 200vh;
            padding-top: 80px;
            color: var(--text-primary);
            transition: var(--transition);
        }

        .navbar {
            background: var(--nav-bg) !important;
            backdrop-filter: blur(20px) saturate(180%) brightness(1.05);
            border-bottom: 1px solid var(--nav-border);
            box-shadow: var(--nav-shadow);
            padding: 0.75rem 0;
            transition: var(--transition);
        }

        .navbar.scrolled {
            padding: 0.5rem 0;
            backdrop-filter: blur(25px) saturate(200%);
        }

        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            background: linear-gradient(135deg, #667eea, #764ba2);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-shadow: 0 2px 4px rgba(255, 255, 255, 0.9);
        }

        [data-bs-theme="dark"] .navbar-brand {
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
        }

        .navbar-brand:hover {
            transform: translateY(-1px);
        }

        .navbar-brand img {
            transition: var(--transition);
            filter: drop-shadow(0 2px 8px rgba(102, 126, 234, 0.3));
        }

        .navbar-brand:hover img {
            transform: scale(1.05) rotate(5deg);
        }

        .vertical-bar {
            width: 2px;
            height: 30px;
            background: linear-gradient(180deg, transparent, #667eea, transparent);
            margin: 0 1.5rem;
            border-radius: 1px;
            opacity: 0.4;
        }

        /* Enhanced nav-link styles for better visibility */
        .nav-link {
            font-weight: 600 !important;
            color: var(--nav-text) !important;
            padding: 0.5rem 1rem !important;
            margin: 0 0.25rem;
            border-radius: 8px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
            border: 1px solid transparent;
        }

        [data-bs-theme="dark"] .nav-link {
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
        }

        .nav-link::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
            transition: left 0.6s;
        }

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

        /* Enhanced hover states */
        .nav-link:hover {
            color: var(--nav-text-hover) !important;
            background: var(--nav-hover);
            transform: translateY(-2px);
            box-shadow: var(--nav-link-shadow);
            border-color: rgba(102, 126, 234, 0.2);
        }

        /* Enhanced active state */
        .nav-link.active {
            color: #5a67d8 !important;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(118, 75, 162, 0.1));
            border: 1px solid rgba(102, 126, 234, 0.3);
            box-shadow: var(--nav-link-shadow);
            font-weight: 700 !important;
        }

        [data-bs-theme="dark"] .nav-link.active {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.25), rgba(118, 75, 162, 0.2));
            border: 1px solid rgba(102, 126, 234, 0.4);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 24px;
            height: 3px;
            background: linear-gradient(90deg, #667eea, #764ba2);
            border-radius: 2px;
            box-shadow: 0 1px 3px rgba(102, 126, 234, 0.4);
        }

        /* Enhanced focus states for accessibility */
        .nav-link:focus {
            outline: none;
            box-shadow: var(--nav-link-glow);
            background: rgba(102, 126, 234, 0.1);
        }

        .language-switcher {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-left: 1rem;
            padding-left: 1rem;
            border-left: 1px solid var(--border-color);
        }

        .language-flag {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 2px solid transparent;
            transition: var(--transition);
            cursor: pointer;
            object-fit: cover;
        }

        .language-flag:hover {
            transform: scale(1.1);
            border-color: rgba(102, 126, 234, 0.5);
            box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
        }

        .language-flag.active {
            border-color: #667eea;
            box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
        }

        .navbar-toggler {
            border: 1px solid rgba(102, 126, 234, 0.3);
            padding: 0.5rem;
            transition: var(--transition);
            background: rgba(255, 255, 255, 0.8);
        }

        [data-bs-theme="dark"] .navbar-toggler {
            background: rgba(15, 23, 42, 0.8);
            border: 1px solid rgba(102, 126, 234, 0.5);
        }

        .navbar-toggler:hover {
            background: var(--nav-hover);
            border-color: #667eea;
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28102, 126, 234, 0.8%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* Dropdown enhancements */
        .dropdown-menu {
            background: var(--nav-bg) !important;
            backdrop-filter: blur(20px) !important;
            border: 1px solid var(--nav-border) !important;
            border-radius: 12px !important;
            box-shadow: var(--nav-shadow) !important;
            padding: 0.5rem !important;
        }

        /* Improved text contrast for dropdowns */
        .dropdown-item {
            color: var(--nav-text) !important;
            font-weight: 500;
            border-radius: 6px !important;
            margin: 0.125rem 0 !important;
            transition: var(--transition) !important;
        }

        .dropdown-item:hover {
            background: var(--nav-hover) !important;
            color: var(--nav-text-hover) !important;
            transform: translateX(4px) !important;
            font-weight: 600;
        }

        /* Enhanced icons for better visibility */
        .nav-link i {
            margin-right: 0.5rem;
            opacity: 0.8;
            transition: var(--transition);
            color: var(--nav-text);
            filter: drop-shadow(0 1px 1px rgba(255, 255, 255, 0.8));
        }

        [data-bs-theme="dark"] .nav-link i {
            filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.5));
        }

        .nav-link:hover i {
            opacity: 1;
            transform: scale(1.15);
            color: #667eea;
        }

        .nav-link.active i {
            opacity: 1;
            color: #5a67d8;
            transform: scale(1.1);
        }

        /* Mobile optimizations */
        @media (max-width: 991.98px) {
            .navbar-collapse {
                background: var(--nav-bg) !important;
                backdrop-filter: blur(20px) saturate(200%) brightness(1.1) !important;
                border-radius: 12px !important;
                margin-top: 1rem !important;
                padding: 1rem !important;
                border: 1px solid var(--nav-border) !important;
            }

            .nav-link {
                background: var(--section-bg);
                margin: 0.25rem 0 !important;
                text-align: center !important;
                border: 1px solid var(--border-color);
                box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            }
            
            .nav-link.active {
                background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.15));
                border-color: rgba(102, 126, 234, 0.4);
            }

            [data-bs-theme="dark"] .nav-link.active {
                background: linear-gradient(135deg, rgba(102, 126, 234, 0.3), rgba(118, 75, 162, 0.25));
            }

            .language-switcher {
                border-left: none !important;
                border-top: 1px solid var(--border-color) !important;
                padding: 1rem 0 0 !important;
                margin: 1rem 0 0 !important;
                justify-content: center !important;
            }

            .vertical-bar {
                display: none !important;
            }
        }

        /* Scroll progress indicator */
        .scroll-progress {
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 0%;
            height: 3px;
            background: linear-gradient(90deg, #667eea, #764ba2, #667eea);
            background-size: 200% 100%;
            transition: width 0.1s ease;
            z-index: 1031;
            animation: progress-shimmer 2s infinite linear;
            border-radius: 0 2px 2px 0;
        }

        @keyframes progress-shimmer {
            0% {
                background-position: 200% 0;
            }
            100% {
                background-position: -200% 0;
            }
        }

        /* Sidebar styles */
        .offcanvas {
            background: var(--nav-bg);
            backdrop-filter: blur(20px);
        }
        
        .offcanvas-header {
            border-bottom: 1px solid var(--nav-border);
        }
        
        .offcanvas-body .nav-link {
            margin: 0.25rem 0;
            text-align: left;
        }
        
        /* Additional styles for enhanced visibility */
        .nav-link.click-feedback {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.15)) !important;
            transform: scale(0.98) !important;
            box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3) !important;
        }
        
        [data-bs-theme="dark"] .nav-link.click-feedback {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.3), rgba(118, 75, 162, 0.25)) !important;
        }
        
        .language-flag.ripple {
            position: relative;
            overflow: hidden;
        }
        
        .language-flag.ripple::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(102, 126, 234, 0.2);
            transform: translate(-50%, -50%);
            animation: ripple 0.6s linear;
        }
        
        @keyframes ripple {
            to {
                width: 200%;
                height: 200%;
                opacity: 0;
            }
        }
        
        .navbar-brand.loading img {
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        /* Theme transition */
        * {
            transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease !important;
        }


/* Ripple effect for language flags */
.language-flag.ripple {
    position: relative;
    overflow: hidden;
}

.language-flag.ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    animation: ripple 0.6s ease-out;
}

@keyframes ripple {
    to {
        width: 200%;
        height: 200%;
        opacity: 0;
    }
}

/* Click feedback for nav links */
.nav-link.click-feedback {
    background: rgba(102, 126, 234, 0.1) !important;
    transform: scale(0.95) !important;
    transition: all 0.3s ease !important;
}

/* Loading state for navbar brand */
.navbar-brand.loading {
    opacity: 0.7;
    pointer-events: none;
}

.navbar-brand.loading::after {
    content: '...';
    animation: loadingDots 1.5s infinite;
}

@keyframes loadingDots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* Smooth transitions for nav links */
.nav-link {
    transition: all 0.3s ease !important;
}

/* Scroll progress bar */
#scrollProgress {
    transition: width 0.1s ease;
}