.opa-mortgage-calculator {
    max-width: 400px;
    margin: 1em 0;
    padding: 1.25em;
    background: #f8f9fa;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    font-family: inherit;
}

.opa-calc-title {
    margin: 0 0 0.5em;
    font-size: 1.25em;
}

.opa-calc-desc {
    margin: 0 0 1em;
    font-size: 0.9em;
    color: #555;
}

.opa-calc-form label {
    display: block;
    margin-top: 0.75em;
    margin-bottom: 0.25em;
    font-weight: 600;
}

.opa-calc-form input[type="number"] {
    width: 100%;
    max-width: 100%;
    padding: 0.5em;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

.opa-calc-hint {
    display: block;
    font-size: 0.8em;
    color: #666;
    margin-top: 0.2em;
}

.opa-calc-btn {
    margin-top: 1em;
    padding: 0.6em 1.2em;
    background: #1a73e8;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
}

.opa-calc-btn:hover {
    background: #1557b0;
}

.opa-calc-results {
    margin-top: 1.25em;
    padding-top: 1em;
    border-top: 1px solid #e0e0e0;
}

.opa-calc-results p {
    margin: 0.4em 0;
}

.opa-calc-rent-note {
    margin-top: 0.75em;
    font-size: 0.9em;
    color: #0d6b0d;
    font-style: italic;
}

@media (max-width: 480px) {
    .opa-mortgage-calculator {
        padding: 1em;
    }
}