*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial, Helvetica, sans-serif;
}

body{
    background:#f4f4f4;
}

/* Khung chính */
.container{
    width:100%;
    min-height:100vh;
    margin:0;
    display:flex;
    background:#fff;
}

/* Sidebar */
.sidebar{
    width:220px;
    background:#2f4358;
    color:white;
    padding:20px;
}

.sidebar h2{
    margin-bottom:25px;
    font-size:28px;
}

.sidebar ul{
    list-style:none;
}

.sidebar li{
    padding:10px 0;
    cursor:pointer;
}

.sidebar li:hover{
    color:#ffd700;
}

/* Nội dung */
.content{
    flex:1;
    padding:20px;
}

.content h1{
    margin-bottom:20px;
}

/* Card */
.cards{
    display:flex;
    gap:20px;
    margin-bottom:25px;
}

.card{
    flex:1;
    background:#fff;
    padding:18px;
    border-radius:8px;
    box-shadow:0 2px 8px rgba(0,0,0,.15);
}

.card h3{
    margin-bottom:10px;
    font-size:18px;
}

.card p{
    font-size:20px;
    font-weight:bold;
}

/* Bảng */
table{
    width:100%;
    border-collapse:collapse;
    margin-top:15px;
}

th{
    background:#eeeeee;
    padding:12px;
    text-align:left;
}

td{
    padding:12px;
    border-bottom:1px solid #dddddd;
}

tr:nth-child(even){
    background:#f8f8f8;
}