style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: Arial, sans-serif;
    background-color: #0e0e0e;
}

.calculator {
    width: 380px;
    padding: 15px;
    border-radius: 20px;
    background: linear-gradient(145deg, #1a1a1a, #2e2e2e);
    box-shadow: 10px 10px 15px #0b0b0b, -10px -10px 15px #373737;
    border: 1px solid #03e9f4;
}

input#result {
    width: 100%;
    padding: 10px;
    font-size: 24px;
    text-align: right;
    background-color: #111;
    color: #03e9f4;
    border: none;
    border-radius: 10px;
    margin-bottom: 10px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

button {
    padding: 15px;
    font-size: 16px;
    border-radius: 8px;
    border: none;
    box-shadow: 5px 5px 10px #0b0b0b, -5px -5px 10px #373737;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    cursor: pointer;
}

/* Different Colors for Different Buttons */
button.clear {
    background-color: #ff3e3e;
    color: #fff;
}

button.delete {
    background-color: #ff993e;
    color: #fff;
}

button.operator {
    background-color: #03e9f4;
    color: #000;
}

button.function {
    background-color: #ffae42;
    color: #000;
}

button.bracket {
    background-color: #ffcc00;
    color: #000;
}

button.number {
    background-color: #6aff6a;
    color: #000;
}

button.equal {
    background-color: #03e9f4;
    color: #000;
}

/* Hover effect with glow */
button:hover {
    transform: translateY(-3px);
    background: #fff;
    box-shadow: 0 0 10px #03e9f4, 0 0 20px #03e9f4, 0 0 30px #03e9f4;
}

button:active {
    transform: translateY(2px);
}

@media (max-width: 400px) {
    .calculator {
        width: 100%;
        padding: 10px;
    }

    button {
        padding: 12px;
        font-size: 14px;
    }
}