@media (max-width: 900px) {
    .calendar-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .mobile-topbar {
        display: flex;
        align-items: center;
    }

    .mobile-topbar__toggle {
        display: flex !important;
        position: static !important;
        top: auto !important;
        left: auto !important;
    }

    .sidebar-toggle--desktop {
        display: none !important;
    }

    .sidebar-overlay {
        display: block;
        top: 64px;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        top: 64px;
        height: calc(100vh - 64px);
    }

    .sidebar__header {
        display: none;
    }

    .sidebar.is-open {
        transform: translateX(0);
        box-shadow: 8px 0 32px rgba(0, 0, 0, 0.2);
    }

    body.has-topbar .container {
        padding-top: calc(64px + 24px);
    }

    .container--with-sidebar {
        margin-left: 0;
        width: 100%;
    }

    .site-footer--with-sidebar {
        margin-left: 0;
        width: 100%;
    }

    .grade-summary--with-chart {
        grid-template-columns: 1fr;
    }

    .grade-summary__chart canvas {
        height: 200px;
    }
}

@media (max-width: 600px) {
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .filters__form {
        flex-direction: column;
        align-items: stretch;
    }

    .agenda-item {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .agenda-item__header {
        gap: 8px;
    }

    .agenda-item__info {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .agenda-item__separator {
        display: none;
    }

    .agenda-item__actions {
        flex-direction: row;
        justify-content: flex-end;
        width: 100%;
    }

    .course-card {
        min-height: auto;
    }

    .course-card__header h2 {
        font-size: 1.1rem;
    }

    .formation-card__header {
        flex-wrap: wrap;
        gap: 10px;
    }

    .formation-card__header-left {
        gap: 10px;
        flex: 1;
        min-width: 0;
    }

    .formation-card__header h2 {
        font-size: 1.1rem;
    }

    .formation-card__header-actions {
        gap: 4px;
    }

    .formation-card__description {
        -webkit-line-clamp: 3;
        line-clamp: 3;
    }
}

@media (max-width: 480px) {
    .card-grid {
        gap: 12px;
    }

    .card {
        padding: 20px;
    }

    .course-card__header {
        margin-bottom: 12px;
        padding-bottom: 12px;
    }

    .course-card__content {
        gap: 10px;
    }

    .course-card__footer {
        padding-top: 12px;
        gap: 6px;
    }
}