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

body{
display:flex;
background:#f1f5f9;
}

.sidebar{
width:260px;
min-height:100vh;
background:#0f172a;
padding:30px;
color:white;
}

.sidebar h1{
font-size:32px;
}

.sidebar p{
color:#94a3b8;
margin-top:5px;
margin-bottom:40px;
}

.menu-btn{
width:100%;
padding:14px;
margin-bottom:12px;
border:none;
border-radius:12px;
background:#1e293b;
color:white;
cursor:pointer;
text-align:left;
}

.menu-btn:hover{
background:#334155;
}

.main{
flex:1;
padding:40px;
}

.section{
display:none;
}

.active-section{
display:block;
}

.cards{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
gap:20px;
margin-top:20px;
}

.card{
background:white;
padding:25px;
border-radius:20px;
margin-bottom:25px;
}

.stat-card h3{
font-size:40px;
margin-bottom:10px;
}

.grid{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
gap:15px;
margin-top:20px;
}

input{
padding:14px;
border:1px solid #cbd5e1;
border-radius:12px;
}

button{
padding:14px 20px;
border:none;
border-radius:12px;
background:#0f172a;
color:white;
cursor:pointer;
margin-top:15px;
}

table{
width:100%;
border-collapse:collapse;
margin-top:20px;
}

th,td{
padding:15px;
text-align:left;
border-bottom:1px solid #e2e8f0;
}

.header-row{
display:flex;
justify-content:space-between;
align-items:center;
}

.delete-btn{
background:#dc2626;
}

@media(max-width:768px){
body{
flex-direction:column;
}

.sidebar{
width:100%;
min-height:auto;
}
}