/* Design adaptatif */
@media (max-width: 768px) {
    body { overflow: auto; }
    .app-container {
        flex-direction: column;
        height: auto;
    }
    .filters-panel {
        width: 100%;
        box-sizing: border-box;
        border-bottom: 1px solid var(--border-color);
    }
    .results-panel {
        height: auto;
    }
}