body {
            background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 50%, #000000 100%);
            min-height: 100vh;
        }
        
        .cert-card {
            transition: all 0.3s ease;
            background: linear-gradient(145deg, #1a1a1a, #2d2d2d);
            border: 1px solid #333;
        }
        
        .cert-card:hover {
            transform: translateY(-10px) scale(1.02);
            box-shadow: 0 20px 40px rgba(220, 38, 38, 0.3);
            border-color: #dc2626;
        }
        
        .cert-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(45deg, transparent, rgba(220, 38, 38, 0.1), transparent);
            opacity: 0;
            transition: opacity 0.3s ease;
            border-radius: 12px;
        }
        
        .cert-card:hover::before {
            opacity: 1;
        }
        
        .nav-title {
            background: linear-gradient(90deg, #dc2626, #ef4444, #dc2626);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: glow 2s ease-in-out infinite alternate;
        }
        
        @keyframes glow {
            from { filter: drop-shadow(0 0 5px rgba(220, 38, 38, 0.5)); }
            to { filter: drop-shadow(0 0 20px rgba(220, 38, 38, 0.8)); }
        }
        
        .back-btn {
            transition: all 0.3s ease;
        }
        
        .back-btn:hover {
            background: linear-gradient(45deg, #dc2626, #ef4444);
            transform: translateX(-5px);
        }
        
        .cert-image {
            transition: all 0.3s ease;
            filter: grayscale(30%) brightness(0.9);
        }
        
        .cert-card:hover .cert-image {
            filter: grayscale(0%) brightness(1.1);
        }
        
        .cert-title {
            background: linear-gradient(90deg, #ffffff, #f3f4f6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .decorative-line {
            background: linear-gradient(90deg, transparent, #dc2626, transparent);
            height: 2px;
            width: 100%;
            margin: 20px 0;
        }