/* ===== Tablet (768px - 1199px) ===== */
@media (max-width: 1199px) {
    :root {
        --sidebar-width: 220px;
    }

    #main-content {
        padding: 20px;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .course-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

/* ===== Mobile (< 768px) ===== */
@media (max-width: 767px) {
    :root {
        --nav-height: 56px;
    }

    #main-nav {
        padding: 0 12px;
        gap: 8px;
    }

    .nav-brand .nav-title {
        display: none;
    }

    .nav-search {
        display: none;
    }

    #nav-user-name {
        display: none;
    }

    #sidebar {
        transform: translateX(-100%);
        z-index: 150;
        width: 280px;
        box-shadow: var(--shadow-xl);
    }

    #sidebar.open {
        transform: translateX(0);
    }

    #main-content {
        margin-left: 0;
        max-width: 100%;
        padding: 16px;
        padding-bottom: 80px;
    }

    #mobile-nav {
        display: flex !important;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: 64px;
        background: var(--bg-nav);
        border-top: 1px solid var(--border);
        z-index: 100;
        justify-content: space-around;
        align-items: center;
        box-shadow: 0 -2px 10px rgba(0,0,0,0.05);
    }

    .mobile-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 3px;
        color: var(--text-muted);
        font-size: 0.7rem;
        padding: 8px 12px;
        border-radius: var(--radius-sm);
        transition: color var(--transition);
        text-decoration: none;
    }

    .mobile-nav-item.active {
        color: var(--primary);
    }

    .mobile-nav-item:hover {
        color: var(--primary);
    }

    /* Dashboard */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .course-grid {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .page-header h1 {
        font-size: 1.4rem;
    }

    /* Auth */
    .auth-card {
        max-width: 100%;
        border-radius: var(--radius);
    }

    .auth-header, .auth-body {
        padding-left: 24px;
        padding-right: 24px;
    }

    .auth-footer {
        padding-left: 24px;
        padding-right: 24px;
    }

    /* Exam */
    .exam-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
        position: sticky;
        top: 56px;
    }

    .exam-info {
        flex-wrap: wrap;
        gap: 12px;
    }

    .question-nav-grid {
        grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
    }

    /* Tables */
    .table-container {
        font-size: 0.8rem;
    }

    thead th, tbody td {
        padding: 8px 10px;
    }

    /* Forms */
    .form-row {
        grid-template-columns: 1fr;
    }

    /* Quick Actions */
    .quick-actions {
        grid-template-columns: 1fr 1fr;
    }

    /* Modal */
    .modal-container {
        width: 95%;
        max-height: 90vh;
        border-radius: var(--radius);
    }

    .modal-header, .modal-body, .modal-footer {
        padding: 16px;
    }

    /* Slide Panel */
    .slide-panel {
        width: 100%;
    }

    /* Webcam preview */
    .webcam-preview {
        width: 120px;
        height: 90px;
        bottom: 74px;
    }
}

/* ===== Small Mobile (< 375px) ===== */
@media (max-width: 374px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .quick-actions {
        grid-template-columns: 1fr;
    }

    .role-selector {
        grid-template-columns: 1fr;
    }
}

/* ===== Print ===== */
@media print {
    #main-nav, #sidebar, #mobile-nav, .slide-panel,
    #toast-container, .modal-overlay, .btn {
        display: none !important;
    }

    #main-content {
        margin: 0;
        max-width: 100%;
        padding: 0;
    }

    body {
        background: white;
        color: black;
    }
}