body{
font-family: Arial, sans-serif;
margin:0;
background:#f5f5f5;
}

header{
background:#4b66a3;
color:white;
padding:20px;
}

nav button{
margin-right:10px;
padding:10px 16px;
border:none;
border-radius:6px;
background:#6e86c6;
color:white;
}

main{
padding:20px;
}

.page{
display:none;
background:white;
padding:20px;
border-radius:12px;
}

.sub{
font-size:18px;
margin-top:20px;
}

.row{
display:flex;
gap:10px;
margin-top:10px;
}

input,select{
padding:10px;
border-radius:6px;
border:1px solid #ccc;
width:100%;
}

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

th,td{
border:1px solid #ddd;
padding:10px;
}