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

/* ===== BODY ===== */
body{
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg,#93c5fd,#e0f2fe);
    min-height:100vh;

    display:flex;
    justify-content:center;
    align-items:center;
}

/* ===== CONTAINER ===== */
.container{
    width:90%;
    max-width:900px;
    background:white;
    padding:50px;
    border-radius:20px;
    text-align:center;
    box-shadow:0 15px 30px rgba(0,0,0,0.15);
}

.container h1{
    margin-bottom:10px;
}

.container h1{
    margin-bottom:5px;
}

.container p{
    color:#ffffff;
    margin-bottom:3px;

}

/* ===== DANH SÁCH ===== */
.week9-list{
    margin-top:35px;
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:30px;
}

/* ===== CARD ===== */
.card{
    text-decoration:none;
    background:#2563eb;
    color:white;
    padding:40px;
    border-radius:18px;
    transition:0.3s;
}

.card:hover{
    background:#1d4ed8;
    transform:translateY(-8px);
}

/* ===== RESPONSIVE ===== */
@media(max-width:768px){
    .week9-list{
        grid-template-columns:1fr;
    }
}