.calc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}
@media (max-width: 768px) {
    .calc-grid {
        grid-template-columns: 1fr;
    }
}
.input-section, .output-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.input-group label {
    font-weight: 600;
    color: var(--text-secondary);
}
.input-group input {
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
}
.input-group input[readonly] {
    background: var(--primary-transparent);
    font-weight: 700;
}
h3 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}