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

body{
    background:#f5f7fb;
}

.sidebar{
    position:fixed;
    left:0;
    top:0;
    width:260px;
    height:100vh;
    background:#111827;
    padding:25px;
}

.logo{
    color:#fff;
    font-size:24px;
    font-weight:700;
    margin-bottom:40px;
}

.sidebar ul{
    list-style:none;
    padding:0;
}

.sidebar ul li{
    margin-bottom:10px;
}

.sidebar ul li a{
    display:block;
    text-decoration:none;
    color:#d1d5db;
    padding:12px 15px;
    border-radius:8px;
    transition:.3s;
}

.sidebar ul li a:hover{
    background:#2563eb;
    color:#fff;
}

.content{
    margin-left:260px;
    padding:35px;
}

.page-title{
    font-size:32px;
    font-weight:700;
    margin-bottom:30px;
}

.stats{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:20px;
    margin-bottom:30px;
}

.stat-card{
    background:#fff;
    padding:25px;
    border-radius:12px;
    box-shadow:0 3px 15px rgba(0,0,0,.08);
}

.stat-card h2{
    font-size:36px;
    margin-bottom:10px;
}

.stat-card p{
    color:#666;
    margin:0;
}

.welcome-box{
    background:#fff;
    padding:30px;
    border-radius:12px;
    box-shadow:0 3px 15px rgba(0,0,0,.08);
}

.table-container{
    background:#fff;
    padding:20px;
    border-radius:12px;
    box-shadow:0 3px 15px rgba(0,0,0,.08);
}

.form-box{
    background:#fff;
    padding:30px;
    border-radius:12px;
    box-shadow:0 3px 15px rgba(0,0,0,.08);
}

.btn-primary{
    background:#2563eb;
    border:none;
}

.btn-success{
    border:none;
}

.btn-danger{
    border:none;
}

@media(max-width:992px){

    .sidebar{
        width:100%;
        height:auto;
        position:relative;
    }

    .content{
        margin-left:0;
    }

    .stats{
        grid-template-columns:1fr;
    }

}