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

body {
    font-family: Arial, sans-serif;
    background: url('calc.png') center/cover no-repeat;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    padding: 20px;
}
.scientificcalculatorT {
    background: #282c34;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
    text-align: center;
    width: 100%;
    max-width: 400px;
    color: #fff;
}

input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    font-size: 18px;
    border: 1px solid #555;
    border-radius: 5px;
    background: #333;
    color: #fff;
}

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

.buttons button {
    background: linear-gradient(135deg, #444, #555);
    border: none;
    border-radius: 5px;
    padding: 10px;
    font-size: 16px;
    color: #fff;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.buttons button:hover {
    background: linear-gradient(135deg, #555, #666);
    transform: translateY(-2px);
}

.equal {
    grid-column: span 2;
    background: #ff5722;
}

.equal:hover {
    background: #ff7043;
}

#canvas {
    height: 150px;
    margin-top: 20px;
    background: #1a1a1a;
    border-radius: 5px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

@media (max-width: 768px) {
    .buttons {
        grid-template-columns: repeat(3, 1fr);
    }

    .buttons button {
        font-size: 14px;
    }
}