.calculator {
    direction: rtl;
    border: 0;
    border-radius: 16px;
    overflow: hidden;
}

.calculator-display {
    height: 70px;
    direction: ltr;
    text-align: right;
    font-size: 2rem;
    font-weight: 600;
    background-color: #f8f9fa;
}

.calculator-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

    .calculator-buttons .btn {
        min-height: 52px;
        font-size: 1.15rem;
        font-weight: 600;
        border-radius: 10px;
    }