.sf-calc-container {
    max-width: 500px;
    margin: 20px auto;
    font-family: inherit;
}

.sf-calc-card {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.sf-calc-heading {
    margin-top: 0;
    margin-bottom: 20px;
    font-size: 1.4rem;
    color: #333;
    text-align: center;
}

.sf-calc-input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.sf-calc-input-group {
    display: flex;
    flex-direction: column;
}

.sf-calc-input-group label {
    font-size: 0.9rem;
    margin-bottom: 5px;
    font-weight: 600;
}

.sf-calc-input-group input {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}

.sf-calc-presets {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.sf-calc-presets span {
    font-size: 0.85rem;
    color: #666;
}

.sf-preset-btn {
    padding: 5px 10px;
    font-size: 0.8rem;
    cursor: pointer;
    background: #f0f0f0;
    border: 1px solid #ccc;
    border-radius: 4px;
    transition: background 0.2s;
}

.sf-preset-btn:hover {
    background: #e0e0e0;
}

.sf-calc-error {
    color: #d32f2f;
    font-size: 0.85rem;
    margin-bottom: 15px;
    text-align: center;
}

.sf-calc-results {
    background: #f9f9f9;
    padding: 15px;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 15px;
}

.sf-result-item {
    display: flex;
    justify-content: space-between;
    font-size: 1rem;
}

.sf-result-label {
    color: #555;
}

.sf-result-val {
    font-weight: bold;
    color: #000;
}

.sf-calc-sentence {
    margin: 0;
    padding: 10px;
    background: #e3f2fd;
    border-radius: 4px;
    font-size: 0.95rem;
    color: #1565c0;
    text-align: center;
}

@media (max-width: 480px) {
    .sf-calc-input-grid {
        grid-template-columns: 1fr;
    }
}