body {
        font-family: Arial, sans-serif;
        margin: 0;
        background: #f4f6f9;
        color: #333;
    }

    header {
        background: #1f2937;
        color: white;
        padding: 20px;
        text-align: center;
    }

    .container {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
        padding: 20px;
    }

    .card {
        background: white;
        border-radius: 12px;
        padding: 20px;
        box-shadow: 0 4px 10px rgba(0,0,0,0.08);
        transition: transform 0.2s ease;
    }

    .card:hover {
        transform: translateY(-5px);
    }

    .card h2 {
        margin-top: 0;
        font-size: 20px;
        padding-bottom: 10px;
        border-bottom: 2px solid #eee;
    }

    .tag {
        display: inline-block;
        padding: 4px 10px;
        border-radius: 20px;
        font-size: 12px;
        margin-bottom: 10px;
        color: white;
    }

    .virus { background: #ef4444; }
    .worm { background: #f59e0b; }
    .trojan { background: #3b82f6; }

    ul {
        padding-left: 18px;
    }

    /* RESPONSIVE */
    @media (max-width: 900px) {
        .container {
            grid-template-columns: 1fr;
        }
    }