* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

header {
    background: rgba(0,0,0,0.95);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
}

header h1 { font-size: 1.8rem; }
nav a { 
    color: white; 
    text-decoration: none; 
    margin-left: 1.5rem; 
    font-weight: 500;
    transition: color 0.3s;
}
nav a:hover { color: #ffd700; }

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.product-card {
    background: rgba(255,255,255,0.95);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    text-align: center;
    transition: all 0.4s ease;
    backdrop-filter: blur(10px);
}

.product-card:hover {
    transform: translateY(-15px);
    box-shadow: 0 30px 60px rgba(0,0,0,0.25);
}

.product-card.featured {
    border: 3px solid #ffd700;
    background: rgba(255,215,0,0.1);
}

.grade-icon { 
    font-size: 4.5rem; 
    margin-bottom: 1rem; 
}

h2 { 
    color: #2c3e50; 
    margin-bottom: 1rem; 
    font-size: 2rem;
}

.price { 
    font-size: 2.5rem; 
    color: #e74c3c; 
    font-weight: bold; 
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

ul { 
    text-align: left; 
    margin-bottom: 2rem; 
    padding-left: 1.5rem;
}

ul li { 
    margin: 0.75rem 0; 
    color: #555; 
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 1.2rem 2.5rem;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 30px rgba(102,126,234,0.4);
}

footer {
    text-align: center;
    padding: 2.5rem;
    color: rgba(255,255,255,0.9);
    background: rgba(0,0,0,0.8);
    margin-top: 3rem;
}

@media (max-width: 768px) {
    .product-grid { 
        grid-template-columns: 1fr; 
        padding: 1rem; 
        gap: 1.5rem;
    }
    header { flex-direction: column; gap: 1rem; text-align: center; }
}