body {
            box-sizing: border-box;
        }
        
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.6s ease;
        }
        
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        .hero-slider {
            background-size: cover;
            background-position: center;
            transition: background-image 1s ease-in-out;
        }
        
        .product-card {
            transition: all 0.3s ease;
        }
        
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }
        
        .nav-link {
            position: relative;
            transition: color 0.3s ease;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -5px;
            left: 0;
            background-color: #3b82f6;
            transition: width 0.3s ease;
        }
        
        .nav-link:hover::after {
            width: 100%;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, #3b82f6, #1d4ed8);
            transition: all 0.3s ease;
        }
        
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
        }
        
        .parallax {
            background-attachment: fixed;
            background-position: center;
            background-repeat: no-repeat;
            background-size: cover;
        }
        
        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
        }
        
        .floating {
            animation: float 3s ease-in-out infinite;
        }
        
        .page {
            display: none;
        }
        
        .page.active {
            display: block;
        }
        
        .cart-shake {
            animation: shake 0.5s ease-in-out;
        }
        
        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            25% { transform: translateX(-5px); }
            75% { transform: translateX(5px); }
        }
        
        .ripple {
            position: relative;
            overflow: hidden;
        }
        
        .ripple::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(255,255,255,0.5);
            transform: translate(-50%, -50%);
            transition: width 0.6s, height 0.6s;
        }
        
        .ripple:active::before {
            width: 300px;
            height: 300px;
        }