/* Mobile : <768px */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        transform: none;
        background: var(--primary);
    }
    .main-content {
        margin-left: 0;
        padding: 1rem;
    }
    .sidebar-footer {
        position: sticky;
        bottom: 0;
        background: var(--primary);
    }
    .hero-section h1 {
        font-size: 1.8rem;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .two-columns {
        flex-direction: column;
    }
    .chart-container {
        max-width: 100%;
    }
    .section, .hero-section {
        padding: 1rem;
    }
}

/* Tablette : 768px - 1024px */
@media (min-width: 769px) and (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }
    .main-content {
        margin-left: 240px;
        padding: 1.5rem;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}