body{
    margin:0;
    height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:linear-gradient(135deg,#0f2027,#203a43,#2c5364);
    font-family:Segoe UI;
}

.calculator{
    background:#111;
    padding:20px;
    border-radius:20px;
    box-shadow:0 0 25px black;
}

#display{
    width:100%;
    height:70px;
    font-size:28px;
    border:none;
    border-radius:15px;
    margin-bottom:15px;
    text-align:right;
    padding:10px;
    background:#000;
    color:#00ffcc;
}

.buttons{
    display:grid;
    grid-template-columns:repeat(5,70px);
    gap:10px;
}

button{
    height:60px;
    border:none;
    border-radius:15px;
    font-size:18px;
    cursor:pointer;
    background:#333;
    color:white;
}

button:hover{ background:#555; }

.operator{ background:#ff9800; }
.equal{ background:#00c853; }
.clear{ background:#e53935; }
.func{ background:#2962ff; }