body{
font-family:Arial;
margin:0;
background:#f3f3f3;
}

header{
background:#4f67a3;
color:white;
padding:25px;
}

.nav button{
margin-right:10px;
padding:10px 16px;
border:none;
border-radius:8px;
background:#6d84c4;
color:white;
}

main{
padding:20px;
max-width:750px;
margin:auto;
}

.page{
display:none;
}

.card{
background:white;
padding:20px;
border-radius:12px;
margin-bottom:20px;
box-shadow:0 2px 6px rgba(0,0,0,0.1);
}

input,select{
width:100%;
padding:10px;
border-radius:8px;
border:1px solid #ccc;
margin-top:10px;
}

button{
margin-top:10px;
padding:10px 16px;
border:none;
border-radius:8px;
background:#ddd;
cursor:pointer;
}

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

th,td{
border:1px solid #ccc;
padding:10px;
text-align:left;
}