body{
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #1b1625, #2a1f38);
    font-family: 'Segoe UI', sans-serif;
}

#calculator{
    background-color: #2b2338;
    padding: 20px;
    border-radius: 25px;
    width: 340px;
    box-shadow: 0 0 25px rgba(255, 105, 180, 0.15);
    border: 2px solid rgba(255, 105, 180, 0.2);
}

#display{
    width: 100%;
    height: 80px;
    border: none;
    border-radius: 15px;
    margin-bottom: 15px;
    padding: 10px;
    box-sizing: border-box;
    text-align: left;
    font-size: 2rem;
    background-color: #1f1a2b;
    color: #ffe3f2;
    outline: none;
}

#keys{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

button{
    height: 65px;
    border: none;
    border-radius: 15px;
    font-size: 1.3rem;
    font-weight: bold;
    cursor: pointer;
    background-color: #44365b;
    color: #ffe3f2;
    transition: all 0.2s ease;
}

button:hover{
    background-color: #5a4675;
    transform: translateY(-2px);
}

button:active{
    transform: scale(0.95);
}

/* Tombol operator */
button[onclick*="/"],
button[onclick*="*"],
button[onclick*="-"],
button[onclick*="+"]{
    background-color: #c25b9f;
}

button[onclick*="/"]:hover,
button[onclick*="*"]:hover,
button[onclick*="-"]:hover,
button[onclick*="+"]:hover{
    background-color: #d96cb0;
}

/* Tombol sama dengan */
button[onclick="calculate()"]{
    background-color: #ff7eb6;
    color: #2b2338;
}

button[onclick="calculate()"]:hover{
    background-color: #ff99c7;
}

/* Tombol clear */
button[onclick="clearDisplay()"]{
    background-color: #8d4c77;
}

button[onclick="clearDisplay()"]:hover{
    background-color: #a55a8b;
}