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

body{
    background:#f1f5f9;
}

.container{
    display:flex;
    min-height:100vh;
}

/* Sidebar */

.sidebar{
    width:260px;
    background:#0f172a;
    color:white;
    padding:25px;
    height:100vh;
    overflow-y:auto;
    position:sticky;
    top:0;
}

.logo{
    font-size:32px;
    font-weight:bold;
}

.logo span{
    color:#6366f1;
}

.sidebar p{
    color:#94a3b8;
    margin-top:10px;
}

.menu{
    margin-top:40px;
}

.menu button{
    width:100%;
    padding:15px;
    border:none;
    margin-bottom:12px;
    border-radius:12px;
    background:transparent;
    color:white;
    text-align:left;
    cursor:pointer;
    font-size:15px;
}

.menu button:hover{
    background:#1e293b;
}

.active-btn{
    background:#4f46e5 !important;
}

/* Main */

.main{
    flex:1;
    padding:35px;
    overflow-y:auto;
}

/* Header */

.header{
    margin-bottom:35px;
}

.header h1{
    font-size:55px;
    color:#1e293b;
}

.header p{
    color:#64748b;
    margin-top:10px;
}

/* Cards */

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

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

.card p{
    color:#64748b;
}

.card h2{
    margin-top:12px;
    font-size:42px;
}

/* Table Box */

.table-box{
    background:white;
    padding:30px;
    border-radius:25px;
    margin-top:35px;
}

/* Inputs */

input,
select{
    width:100%;
    padding:14px;
    border:1px solid #cbd5e1;
    border-radius:12px;
    outline:none;
    margin-bottom:15px;
}

/* Buttons */

.add-btn{
    background:#4f46e5;
    color:white;
    border:none;
    padding:14px 20px;
    border-radius:12px;
    cursor:pointer;
}

.delete-btn{
    background:red;
    color:white;
    border:none;
    padding:10px 15px;
    border-radius:10px;
    cursor:pointer;
}

/* Subject Grid */

.subject-grid{
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:15px;
}

/* Table */

table{
    width:100%;
    border-collapse:collapse;
}

th,
td{
    padding:18px 0;
    border-bottom:1px solid #e2e8f0;
    text-align:left;
}

.cgpa{
    color:#4f46e5;
    font-weight:bold;
}

.pass{
    background:#dcfce7;
    color:#166534;
    padding:6px 12px;
    border-radius:20px;
}

.fail{
    background:#fee2e2;
    color:#991b1b;
    padding:6px 12px;
    border-radius:20px;
}

/* Responsive */

@media(max-width:1000px){

    .cards{
        grid-template-columns:repeat(2,1fr);
    }

}

@media(max-width:800px){

    .container{
        flex-direction:column;
    }

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

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

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

    .header h1{
        font-size:40px;
    }

}