/* ========== DARK THEME HEADER - ALWAYS DARK ========== */
        .navbar {
            background: rgba(15, 23, 42, 0.98) !important;
            backdrop-filter: blur(20px);
            border-bottom: 1px solid #334155;
            transition: all 0.3s ease;
        }
        
        .navbar.scrolled {
            background: rgba(15, 23, 42, 1) !important;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        
        /* Navigation Links - Dark Theme */
        .nav-link {
            position: relative;
            transition: all 0.3s ease;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, #60a5fa, #a78bfa);
            transition: width 0.3s ease;
        }
        
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        
        /* Mobile Menu Dark Theme */
        .mobile-menu {
            transform: translateX(100%);
            transition: transform 0.3s ease-in-out;
            z-index: 30;
            background: #1e293b !important;
        }
        
        .mobile-menu.active {
            transform: translateX(0);
        }
        
        /* Animations */
        @keyframes fade-in {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .animate-fade-in {
            animation: fade-in 0.8s ease-out;
        }
        
        @keyframes float {
            0%, 100% {
                transform: translateY(0px);
            }
            50% {
                transform: translateY(-20px);
            }
        }
        
        .animate-float {
            animation: float 6s ease-in-out infinite;
        }
        
        /* Ensure all text in header is visible on dark background */
        .navbar * {
            color: #e2e8f0;
        }
        
        .navbar .nav-link {
            color: #d1d5db !important;
        }
        
        .navbar .nav-link:hover {
            color: #60a5fa !important;
        }
        
        .navbar .nav-link.active {
            color: #60a5fa !important;
        }
        
        /* Certificate Card Styles */
        .cert-card {
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            transform-style: preserve-3d;
            perspective: 1000px;
            position: relative;
            overflow: hidden;
            background: rgba(30, 41, 59, 0.6);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(59, 130, 246, 0.2);
        }
        
        .cert-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
            transition: left 0.6s;
        }
        
        .cert-card:hover::before {
            left: 100%;
        }
        
        .cert-card:hover {
            transform: translateY(-10px) scale(1.02);
            box-shadow: 0 25px 50px rgba(59, 130, 246, 0.3), 0 0 30px rgba(139, 92, 246, 0.3);
            border-color: rgba(59, 130, 246, 0.5);
        }
        
        /* Certificate Image Styles */
        .cert-image {
            transition: all 0.3s ease;
            filter: drop-shadow(0 4px 6px rgba(59, 130, 246, 0.3));
        }
        
        .cert-card:hover .cert-image {
            transform: scale(1.05);
            filter: drop-shadow(0 8px 15px rgba(59, 130, 246, 0.5));
        }
        
        /* Certificate Images Gallery */
        .cert-images-gallery {
            background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
        }
        
        .gallery-cert-item {
            transition: all 0.3s ease;
            cursor: pointer;
            background: rgba(59, 130, 246, 0.1);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(59, 130, 246, 0.3);
        }
        
        .gallery-cert-item:hover {
            transform: scale(1.05);
            background: rgba(59, 130, 246, 0.2);
            box-shadow: 0 10px 25px rgba(59, 130, 246, 0.4);
        }
        
        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.95);
            backdrop-filter: blur(10px);
        }
        
        .modal-content {
            display: block;
            margin: 5% auto;
            max-width: 90%;
            max-height: 80%;
            animation: modalFadeIn 0.3s ease;
            border-radius: 10px;
        }
        
        @keyframes modalFadeIn {
            from { opacity: 0; transform: scale(0.8); }
            to { opacity: 1; transform: scale(1); }
        }
        
        .close {
            position: absolute;
            top: 20px;
            right: 35px;
            color: white;
            font-size: 40px;
            font-weight: bold;
            cursor: pointer;
            transition: 0.3s;
        }
        
        .close:hover {
            color: #3b82f6;
            transform: scale(1.2);
        }
        
        .cert-icon {
            background: linear-gradient(135deg, #3b82f6, #1d4ed8);
            transition: all 0.5s ease;
        }
        
        .cert-card:hover .cert-icon {
            transform: scale(1.1) rotate(5deg);
            box-shadow: 0 10px 25px rgba(59, 130, 246, 0.6);
        }
        
        .cert-badge {
            background: linear-gradient(135deg, #10b981, #059669);
            color: white;
            transition: all 0.3s ease;
        }
        
        .section-badge {
            background: linear-gradient(135deg, #fbbf24, #f59e0b);
            color: white;
            animation: pulse 3s ease-in-out infinite;
        }
        
        @keyframes pulse {
            0%, 100% { box-shadow: 0 0 20px rgba(251, 191, 36, 0.5); }
            50% { box-shadow: 0 0 40px rgba(251, 191, 36, 0.8); }
        }

        .gradient-text {
            background: linear-gradient(135deg, #60a5fa, #a78bfa, #818cf8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }