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

/* Nền đen */
body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background-color: #0a0a0a;
    padding: 30px;
    color: #fff;
}

/* Tiêu đề */
h1 {
    text-align: center;
    margin: 40px 0 20px;

    color: #ff1a1a;
    text-shadow: 
        0 0 5px #ff1a1a,
        0 0 10px #ff0000,
        0 0 20px #ff0000;
}

/* Container */
.container {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

/* Card */
.card {
    width: 260px;
    padding: 20px;
    border-radius: 12px;

    background-color: #111;
    border: 1px solid #ff1a1a;

    box-shadow:
        0 0 10px #ff0000,
        inset 0 0 10px #ff0000;

    transition: 0.3s;
}

/* Hover card */
.card:hover {
    transform: translateY(-10px) scale(1.03);
    box-shadow:
        0 0 20px #ff0000,
        0 0 40px #ff0000,
        inset 0 0 15px #ff0000;
}

/* Tiêu đề card */
.card h3 {
    text-align: center;
    margin-bottom: 15px;

    color: #ff4d4d;
    text-shadow: 0 0 10px #ff0000;
}

/* List */
.card ul {
    list-style: none;
}

/* Item */
.card ul li {
    margin: 10px 0;
}

/* Link */
.card ul li a {
    display: block;
    padding: 10px;
    text-decoration: none;

    color: #fff;
    text-align: center;

    border: 1px solid #ff1a1a;
    border-radius: 6px;

    background-color: #1a0000;

    box-shadow: inset 0 0 5px #ff0000;

    transition: 0.3s;
}

/* Hover link */
.card ul li a:hover {
    color: #fff;
    background-color: #ff0000;

    box-shadow:
        0 0 10px #ff0000,
        0 0 20px #ff0000;

    transform: scale(1.05);
}

/* Responsive */
@media (max-width: 768px) {
    .card {
        width: 100%;
        max-width: 350px;
    }
}