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

body{
    background:#f3f3f3;
}

/*=========================
        KHUNG CHÍNH
==========================*/

.container{
    width:1100px;
    margin:20px auto;
    display:flex;
}

/*=========================
        MENU TRÁI
==========================*/

.sidebar{
    width:220px;
    background:#2f4053;
    color:white;
    min-height:500px;
    padding:20px;
}

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

.sidebar ul{
    list-style:none;
}

.sidebar li{
    margin:18px 0;
}

.sidebar a{
    color:white;
    text-decoration:none;
    font-size:15px;
}

.sidebar a:hover{
    color:#00ccff;
}

/*=========================
        NỘI DUNG
==========================*/

.content{
    flex:1;
    background:#f8f8f8;
    padding:25px;
}

.content h1{
    margin-bottom:15px;
}

.cards{
    display:flex;
    justify-content:space-between;
    margin-bottom:25px;
}

.card{
    width:31%;
    background:white;
    padding:18px;
    border-radius:8px;
    box-shadow:0 2px 8px rgba(0,0,0,.15);
}

.card h3{
    margin-bottom:10px;
    font-size:16px;
}

.card p{
    font-size:20px;
    color:#555;
}

/*=========================
        BẢNG
==========================*/

.content h2{
    margin-bottom:12px;
}

table{
    width:100%;
    border-collapse:collapse;
    background:white;
}

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

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

tr:hover{
    background:#f5f5f5;
}