.calculator {
    background: #f9fafb;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-family: sans-serif;
    margin: 30px auto;
    max-width: 500px;
    padding: 24px;
    h1 {
        font-size: 24px;
        margin-bottom: 20px;
        text-align: center;
    }
    h2 {
        font-size: 20px;
        margin-top: 24px;
    }
    input {
        border: 1px solid #ccc;
        border-radius: 6px;
        box-sizing: border-box;
        font-size: 16px;
        margin-top: 4px;
        padding: 8px 10px;
        width: 100%;
    }
    label {
        display: block;
        font-weight: 500;
        margin-top: 12px;
    }
    .history {
        background: white;
        border: 1px solid #ccc;
        border-radius: 6px;
        list-style-type: none;
        margin-top: 10px;
        padding: 8px;
        div {
            border-bottom: 1px solid #eee;
            padding: 6px;
            &:last-child {
                border-bottom: none;
            }
        }
    }
    .operators {
        display: flex;
        gap: 8px;
        margin-top: 8px;
        button {
            background: #2563eb;
            border: none;
            border-radius: 6px;
            color: white;
            cursor: pointer;
            flex: 1;
            font-size: 18px;
            padding: 10px 0;
        }
    }
}