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

body{
    display:flex;
    height:100vh;
}

/* Sidebar */
.sidebar{
    width:250px;
    background:#1f2937;
    color:white;
    padding:20px 0;
}

.sidebar h2{
    text-align:center;
    margin-bottom:30px;
}

.sidebar ul{
    list-style:none;
}

.sidebar ul li{
    padding:15px 25px;
    cursor:pointer;
    transition:.3s;
}

.sidebar ul li:hover{
    background:#374151;
}

.sidebar ul a{
    text-decoration: none;
    color:white;
}

.sidebar ul a:hover{
    text-decoration: underline;
}

/* Main Section */
.main{
    flex:1;
    display:flex;
    flex-direction:column;
}

/* Top Navigation */
.topnav{
    height:60px;
    background:white;
    border-bottom:1px solid #ddd;
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:0 20px;
}

.topnav .logo{
    font-size:20px;
    font-weight:bold;
    color:#333;
}

/* Dropdown */
.dropdown{
    position:relative;
}

.dropdown-btn{
    background:#2563eb;
    color:white;
    border:none;
    padding:10px 15px;
    border-radius:5px;
    cursor:pointer;
}

.dropdown-content{
    display:none;
    position:absolute;
    right:0;
    top:45px;
    min-width:180px;
    background:white;
    border:1px solid #ddd;
    border-radius:5px;
    box-shadow:0 4px 8px rgba(0,0,0,0.1);
    z-index:100;
}

.dropdown-content a{
    display:block;
    padding:12px;
    color:#333;
    text-decoration:none;
}

.dropdown-content a:hover{
    background:#f3f4f6;
}

.dropdown.show .dropdown-content{
    display:block;
}

/* Content */
.content{
    padding:20px;
    background:#f5f7fa;
    flex:1;
}

/* Mobile */
@media(max-width:768px){
    .sidebar{
        width:200px;
    }
}