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

/* Nền */
body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    padding: 30px;
}

/* Tiêu đề */
h1 {
    text-align: center;
    margin: 40px 0 20px;
    color: #fff;
    text-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

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

/* Card chuẩn */
.card {
    width: 260px;
    padding: 20px;
    border-radius: 15px;

    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);

    box-shadow: 0 8px 25px rgba(0,0,0,0.25);

    transition: 0.3s;
}

/* Hover */
.card:hover {
    transform: translateY(-10px) scale(1.03);
}

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

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

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

/* Link */
.card ul li a {
    display: block;
    text-decoration: none;
    padding: 10px;
    border-radius: 8px;

    background: linear-gradient(135deg, #007BFF, #00c6ff);
    color: #fff;
    text-align: center;

    transition: 0.3s;
}

/* Hover link */
.card ul li a:hover {
    background: linear-gradient(135deg, #ff512f, #dd2476);
    transform: scale(1.05);
}

/* ================= FIX PHẦN TUẦN 6 ================= */

/* Vì bạn để h3 + ul ngoài card */
.container > h3 {
    width: 260px;
    padding: 20px;
    border-radius: 15px;

    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);

    box-shadow: 0 8px 25px rgba(0,0,0,0.25);

    color: #fff;
    text-align: center;
}

/* ul đi kèm */
.container > ul {
    width: 260px;
    list-style: none;
    margin-top: -20px;
}

/* link trong ul ngoài */
.container > ul li {
    margin: 10px 0;
}

.container > ul li a {
    display: block;
    padding: 10px;
    border-radius: 8px;

    background: linear-gradient(135deg, #007BFF, #00c6ff);
    color: white;
    text-align: center;
    text-decoration: none;
}

/* Hover */
.container > ul li a:hover {
    background: linear-gradient(135deg, #ff512f, #dd2476);
}

/* Responsive */
@media (max-width: 768px) {
    .card,
    .container > h3,
    .container > ul {
        width: 100%;
        max-width: 350px;
    }
}