* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* Body styles moved to kids-theme.css */

        /* Navbar styles moved to navbar.css */

        .page-content {
            padding: 20px;
            margin-right: 320px;
            /* Space for the new sidebar */
        }

        /* [NEW] Hide protected content by default to prevent flash */
        .protected-content {
            display: none !important;
        }

        #student-folder-sidebar {
            position: fixed;
            top: 90px;
            /* Match navbar height */
            /* Position below the navbar */
            right: 0;
            width: 300px;
            height: calc(100vh - 90px);
            background: #1F2937;
            border-left: 1px solid #374151;
            box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
            z-index: 998;
            display: flex;
            flex-direction: column;
            padding: 20px;
        }

        #student-folder-sidebar h3 {
            color: #E5E7EB;
            margin-bottom: 15px;
            border-bottom: 2px solid #3B82F6;
            padding-bottom: 10px;
        }

        #folder-search {
            width: 100%;
            padding: 12px;
            font-size: 1em;
            background: #111827;
            border: 2px solid #374151;
            border-radius: 8px;
            color: #E5E7EB;
            margin-bottom: 15px;
        }

        #folder-search:focus {
            outline: none;
            border-color: #3B82F6;
        }

        #folder-list-container {
            flex-grow: 1;
            overflow-y: auto;
        }

        #folder-list {
            list-style: none;
            padding: 0;
        }

        .folder-list-item {
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 8px;
            border: 1px solid transparent;
            transition: all 0.2s ease;
        }

        .folder-list-item a {
            color: #9CA3AF;
            text-decoration: none;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .folder-list-item:hover {
            background-color: #374151;
            border-color: #3B82F6;
        }

        .folder-list-item:hover a {
            color: #E5E7EB;
        }

        .page-content {
            padding: 20px;
        }

        .header {
            text-align: center;
            color: #E5E7EB;
            margin-bottom: 30px;
            padding: 20px;
        }

        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
            color: #E5E7EB;
        }

        .header p {
            font-size: 1.2em;
            color: #9CA3AF;
        }

        .search-container {
            max-width: 1200px;
            margin: 0 auto 30px;
            position: relative;
        }

        .search-box {
            width: 100%;
            padding: 15px 20px;
            font-size: 1.1em;
            border: none;
            border-radius: 50px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            outline: none;
        }

        .search-box:focus {
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
        }

        .search-dropdown {
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: #1F2937;
            border-radius: 15px;
            margin-top: 10px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
            max-height: 500px;
            overflow-y: auto;
            z-index: 1000;
            display: none;
        }

        .search-dropdown.active {
            display: block;
        }

        .search-result-item {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 12px 20px;
            cursor: pointer;
            border-bottom: 1px solid #374151;
            transition: background 0.2s ease;
        }

        .search-result-item:hover {
            background: #374151;
        }

        .search-result-item:last-child {
            border-bottom: none;
        }

        .search-result-icon {
            width: 50px;
            height: 50px;
            flex-shrink: 0;
            border-radius: 8px;
            overflow: hidden;
            background: #111827;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5em;
        }

        .search-result-icon img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .search-result-details {
            flex: 1;
            min-width: 0;
        }

        .search-result-id {
            font-size: 0.85em;
            color: #3B82F6;
            font-weight: 600;
            font-family: 'Courier New', monospace;
        }

        .search-result-name {
            font-size: 1em;
            color: #E5E7EB;
            font-weight: 600;
            margin-top: 2px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .search-result-meta {
            display: flex;
            gap: 15px;
            flex-shrink: 0;
            font-size: 0.9em;
            color: #9CA3AF;
        }

        .search-result-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .search-no-results {
            padding: 30px 20px;
            text-align: center;
            color: #6B7280;
            font-size: 1em;
        }

        .tabs-container {
            /* protected-content handled via ID in JS or manually adding class to div */
            max-width: 1200px;
            margin: 0 auto 30px;
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .tab {
            background: #1F2937;
            color: #E5E7EB;
            padding: 12px 30px;
            border-radius: 25px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
            border: 2px solid #374151;
            white-space: nowrap;
        }

        .tab:hover {
            background: #374151;
            border-color: #3B82F6;
            transform: translateY(-2px);
        }

        .tab.active {
            background: #3B82F6;
            color: white;
            border-color: #3B82F6;
        }

        .tab .category-parent {
            opacity: 0.6;
            font-size: 0.85em;
            margin-right: 5px;
        }

        .category-section {
            display: none;
        }

        .category-section.active {
            display: block;
        }

        .category-header {
            max-width: 1200px;
            margin: 0 auto 20px;
            text-align: center;
            color: #E5E7EB;
        }

        .category-header h2 {
            font-size: 2em;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
            font-weight: 600;
        }

        .projects-container {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 25px;
        }

        .project-card {
            background: #1F2937;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            cursor: pointer;
            border: 1px solid #374151;
            position: relative;
        }

        .project-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(59, 130, 246, 0.3);
            border-color: #3B82F6;
        }

        .project-card.completed-project {
            border: 2px solid #10B981;
            opacity: 0.85;
        }

        .project-card.completed-project:hover {
            opacity: 1;
            border-color: #10B981;
        }

        .project-card.in-progress-project {
            border: 2px solid #F59E0B;
        }

        .project-card.in-progress-project:hover {
            border-color: #F59E0B;
        }

        .completion-badge {
            position: absolute;
            top: 10px;
            right: 10px;
            background: #10B981;
            color: white;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.75em;
            font-weight: bold;
            z-index: 10;
            box-shadow: 0 2px 8px rgba(16, 185, 129, 0.4);
        }

        .in-progress-badge {
            position: absolute;
            top: 10px;
            right: 10px;
            background: #F59E0B;
            color: white;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.75em;
            font-weight: bold;
            z-index: 10;
            box-shadow: 0 2px 8px rgba(245, 158, 11, 0.4);
        }

        .remaining-badge {
            position: absolute;
            top: 10px;
            right: 10px;
            background: #3B82F6;
            color: white;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 0.75em;
            font-weight: bold;
            z-index: 10;
            box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
        }

        .project-card.remaining-project {
            border: 2px solid #3B82F6;
        }

        .project-card.remaining-project:hover {
            border-color: #3B82F6;
            box-shadow: 0 15px 40px rgba(59, 130, 246, 0.4);
        }

        .assigned-projects-section {
            max-width: 1200px;
            margin: 30px auto;
            padding: 25px;
            background: linear-gradient(135deg, #7C3AED 0%, #5B21B6 100%);
            border-radius: 20px;
            border: 3px solid #8B5CF6;
            box-shadow: 0 10px 40px rgba(124, 58, 237, 0.4);
        }

        .assigned-header {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 20px;
            color: white;
        }

        .assigned-header h2 {
            font-size: 1.8em;
            margin: 0;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }

        .assigned-icon {
            font-size: 2.5em;
            animation: pulse 2s ease-in-out infinite;
        }

        @keyframes pulse {

            0%,
            100% {
                transform: scale(1);
            }

            50% {
                transform: scale(1.1);
            }
        }

        .assigned-projects-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 20px;
        }

        .assigned-project-card {
            background: white;
            border-radius: 15px;
            overflow: hidden;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 3px solid #A78BFA;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            position: relative;
        }

        .assigned-project-card:hover {
            transform: translateY(-8px) scale(1.02);
            box-shadow: 0 15px 40px rgba(124, 58, 237, 0.5);
            border-color: #DDD6FE;
        }

        .assigned-badge {
            position: absolute;
            top: 10px;
            right: 10px;
            background: #7C3AED;
            color: white;
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.85em;
            font-weight: bold;
            z-index: 10;
            box-shadow: 0 3px 10px rgba(124, 58, 237, 0.5);
            animation: bounce 1s ease-in-out infinite;
        }

        @keyframes bounce {

            0%,
            100% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(-5px);
            }
        }

        /* Lock Overlay for Restricted Projects */
        .locked-project {
            position: relative;
        }

        .locked-project::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.3);
            border-radius: 15px;
            pointer-events: none;
            z-index: 5;
        }

        .lock-overlay {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 3em;
            z-index: 10;
            opacity: 0.9;
            filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.5));
        }

        .section-header {
            max-width: 1200px;
            margin: 30px auto 15px;
            padding: 0 20px;
        }

        .collapsible-section {
            max-width: 1200px;
            margin: 30px auto;
            padding: 0 20px;
        }

        .collapsible-header {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 15px 20px;
            background: #1F2937;
            border-radius: 12px;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 1px solid #374151;
        }

        .collapsible-header:hover {
            background: #374151;
            border-color: #3B82F6;
        }

        .collapsible-header h3 {
            color: #10B981;
            font-size: 1.3em;
            margin: 0;
            flex: 1;
        }

        .collapsible-arrow {
            font-size: 1.2em;
            transition: transform 0.3s ease;
            color: #9CA3AF;
        }

        .collapsible-header.collapsed .collapsible-arrow {
            transform: rotate(-90deg);
        }

        .collapsible-content {
            max-height: 10000px;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .collapsible-content.collapsed {
            max-height: 0;
        }

        .section-header h3 {
            font-size: 1.5em;
            font-weight: 600;
        }

        .section-header p {
            margin: 0;
        }

        /* New rule for project image hover effect */
        .project-card:hover .project-image {
            transform: scale(1.05);
        }

        .project-icon {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: #374151;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #E5E7EB;
            font-size: 3em;
            margin-bottom: 15px;
            /* Added from instruction */
            transition: transform 0.3s ease;
            /* Added from instruction */
        }

        /* New rule for project icon hover effect */
        .project-card:hover .project-icon {
            transform: scale(1.15);
            /* Make icon bigger on hover */
        }

        .project-icon img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .project-info {
            padding: 20px;
        }

        .project-name {
            font-size: 1.3em;
            font-weight: 600;
            color: #E5E7EB;
            margin-bottom: 10px;
        }

        .project-category {
            font-size: 0.9em;
            color: #3B82F6;
            margin-bottom: 10px;
        }

        .project-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px solid #374151;
        }

        .video-count {
            color: #D97706;
            /* Darker Amber/Orange for better visibility on white */
            font-weight: 700;
        }

        .loading {
            text-align: center;
            color: #E5E7EB;
            font-size: 1.5em;
            padding: 50px;
        }

        .error {
            background: #DC2626;
            color: white;
            padding: 20px;
            border-radius: 10px;
            text-align: center;
            max-width: 600px;
            margin: 50px auto;
        }

        .no-results {
            text-align: center;
            color: #9CA3AF;
            font-size: 1.3em;
            padding: 50px;
        }

        .pdf-badge {
            background: #EF4444;
            color: white;
            padding: 4px 10px;
            border-radius: 12px;
            font-size: 0.8em;
            margin-left: 10px;
        }

        .search-active-notice {
            max-width: 1200px;
            margin: 0 auto 20px;
            text-align: center;
            color: #E5E7EB;
            background: #1F2937;
            padding: 10px;
            border-radius: 10px;
            border: 1px solid #374151;
        }

        .connection-monitor-btn {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #3B82F6;
            color: white;
            padding: 15px 25px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            transition: all 0.3s ease;
            z-index: 1000;
            display: flex;
            align-items: center;
            gap: 10px;
            border: 2px solid #3B82F6;
        }

        .connection-monitor-btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(59, 130, 246, 0.5);
            background: #2563EB;
            border-color: #2563EB;
        }

        .connection-count {
            background: #10B981;
            color: white;
            padding: 4px 10px;
            border-radius: 20px;
            font-size: 0.9em;
            font-weight: 600;
        }

        .login-button {
            position: fixed;
            top: 20px;
            right: 20px;
            background: #3B82F6;
            color: white;
            padding: 12px 25px;
            border-radius: 25px;
            border: 2px solid #3B82F6;
            cursor: pointer;
            font-weight: 600;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
            z-index: 999;
        }

        .login-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
            background: #2563EB;
        }

        .login-button.logged-in {
            background: #10B981;
            border-color: #10B981;
        }

        .teacher-button {
            position: fixed;
            top: 20px;
            left: 20px;
            background: #EF4444;
            color: white;
            padding: 12px 25px;
            border-radius: 25px;
            border: 2px solid #EF4444;
            cursor: pointer;
            font-weight: 600;
            font-size: 1em;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
            z-index: 999;
        }

        .teacher-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
            background: #DC2626;
            border-color: #DC2626;
        }

        .progress-button {
            position: fixed;
            top: 70px;
            left: 20px;
            background: #10B981;
            color: white;
            padding: 12px 25px;
            border-radius: 25px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1em;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
            z-index: 999;
            display: flex;
            align-items: center;
            gap: 8px;
            border: 2px solid #10B981;
        }

        .progress-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
            background: #059669;
            border-color: #059669;
        }

        .login-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.8);
            z-index: 1000;
            align-items: center;
            justify-content: center;
        }

        .login-modal.active {
            display: flex;
        }

        .login-modal-content {
            background: #1F2937;
            border-radius: 20px;
            padding: 40px;
            max-width: 500px;
            width: 90%;
            max-height: 80vh;
            overflow-y: auto;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
            border: 1px solid #374151;
        }

        .login-modal h2 {
            color: #E5E7EB;
            margin-bottom: 20px;
            text-align: center;
        }

        /* Styles for Login Modal */
        .modal-overlay {
            display: none;
            /* Hidden by default */
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.8);
            z-index: 3100;
            align-items: center;
            justify-content: center;
        }

        .modal-overlay.active {
            display: flex;
            /* Show when active */
        }

        .modal {
            background: rgba(31, 41, 55, 0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            padding: 30px;
            border-radius: 24px;
            width: 90%;
            max-width: 600px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
            animation: modalFadeIn 0.3s ease-out;
        }

        @keyframes modalFadeIn {
            from {
                opacity: 0;
                transform: scale(0.95) translateY(10px);
            }

            to {
                opacity: 1;
                transform: scale(1) translateY(0);
            }
        }

        /* Header */
        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .modal-header h2 {
            margin: 0;
            color: #60A5FA;
        }

        .close-modal {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            color: #9CA3AF;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5em;
            /* Check if X needs sizing adjustment */
            cursor: pointer;
            transition: all 0.2s ease;
            line-height: 1;
            outline: none;
            /* Remove blue outline */
        }

        .close-modal:hover {
            background: rgba(239, 68, 68, 0.2);
            /* Red tint on hover */
            color: #EF4444;
            border-color: #EF4444;
            transform: rotate(90deg);
        }

        .close-modal:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.3);
        }

        .close-modal:hover {
            color: #F3F4F6;
        }

        .login-view-title {
            color: #E5E7EB;
            margin-bottom: 15px;
            text-align: center;
        }

        .student-search {
            width: 100%;
            padding: 15px;
            border: 2px solid #374151;
            border-radius: 10px;
            font-size: 1.1em;
            margin-bottom: 20px;
            background: #111827;
            color: #E5E7EB;
        }

        .student-search:focus {
            outline: none;
            border-color: #3B82F6;
        }

        .student-list {
            max-height: 400px;
            overflow-y: auto;
        }

        .student-item {
            background: #111827;
            padding: 15px;
            margin-bottom: 10px;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 1px solid #374151;
            color: #E5E7EB;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .student-item:hover {
            background: #3B82F6;
            border-color: #3B82F6;
            transform: translateX(5px);
        }

        .close-modal-btn {
            background: #EF4444;
            color: white;
            padding: 10px 20px;
            border-radius: 10px;
            border: none;
            cursor: pointer;
            margin-top: 20px;
            width: 100%;
            font-weight: 600;
        }

        .close-modal-btn:hover {
            background: #DC2626;
        }

        .logout-btn {
            background: #EF4444;
            color: white;
            padding: 8px 15px;
            border-radius: 8px;
            border: none;
            cursor: pointer;
            margin-left: 10px;
            font-size: 0.9em;
            font-weight: 600;
        }

        .logout-btn:hover {
            background: #DC2626;
        }

        /* New Layout Styles */
        .main-container {
            display: flex;
        }

        .main-content {
            flex-grow: 1;
            margin-right: 380px;
            /* Always leave space for the sidebar */
        }

        #studentSidebar {
            position: fixed;
            top: 70px;
            /* Below navbar */
            right: 0;
            width: 360px;
            height: calc(100vh - 70px);
            background: #1F2937;
            border-left: 2px solid #3B82F6;
            box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
            transform: translateX(0);
            /* Always visible */
            z-index: 999;
            display: flex;
            flex-direction: column;
        }


        .sidebar-content {
            padding: 25px;
            overflow-y: auto;
            flex-grow: 1;
        }

        #folderSearchInput {
            width: 100%;
            padding: 15px;
            font-size: 1.1em;
            background: #111827;
            border: 2px solid #374151;
            border-radius: 10px;
            color: #E5E7EB;
            margin-bottom: 20px;
        }

        #folderSearchInput:focus {
            outline: none;
            border-color: #3B82F6;
        }

        .folder-item,
        .file-item {
            background: #111827;
            padding: 15px 20px;
            margin-bottom: 10px;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 1px solid #374151;
            color: #E5E7EB;
            display: flex;
            align-items: center;
            gap: 15px;
            word-break: break-word;
        }

        .folder-item:hover,
        .file-item:hover {
            background: #374151;
            border-color: #3B82F6;
            transform: translateX(5px);
        }

        .file-item.selected {
            background: #3B82F6;
            border-color: #2563EB;
            color: white;
        }

        .item-icon {
            font-size: 1.5em;
        }

        #openFileBtn {
            margin: 20px;
            padding: 15px;
            font-size: 1.2em;
            background-color: #10B981;
            width: calc(100% - 40px);
            border-radius: 10px;
        }

        /* NEW SIDEBAR STYLES */
        .sidebar-search-input {
            width: 100%;
            padding: 12px;
            font-size: 1em;
            background: #111827;
            border: 2px solid #374151;
            border-radius: 8px;
            color: #E5E7EB;
            margin-bottom: 15px;
            transition: border-color 0.3s ease;
        }

        .sidebar-search-input:focus {
            outline: none;
            border-color: #3B82F6;
        }

        .sidebar-action-btn {
            width: 100%;
            padding: 12px;
            background: #3B82F6;
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            font-size: 1em;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            margin-bottom: 20px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
        }

        .sidebar-action-btn:hover {
            background: #2563EB;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
        }

        .file-metadata {
            display: block;
            font-size: 0.8em;
            color: #6B7280;
            margin-top: 4px;
        }

        .sidebar-list-item {
            padding: 12px;
            border-radius: 8px;
            margin-bottom: 8px;
            border: 1px solid transparent;
            transition: all 0.2s ease;
            cursor: pointer;
            background: rgba(31, 41, 55, 0.95);
            /* Darker background for better contrast */
            border: 1px solid #4B5563;
        }

        .sidebar-list-item:hover {
            background-color: #374151;
            border-color: #3B82F6;
        }

        .sidebar-list-item-content {
            display: flex;
            align-items: center;
            gap: 12px;
            color: #F3F4F6;
            /* Brighter white for text */
            font-weight: 500;
        }

        .sidebar-item-icon {
            font-size: 1.4em;
            min-width: 25px;
            text-align: center;
        }

        .header p {
            font-size: 1.2em;
            color: #9CA3AF;
        }

        /* Marquee Styles */
        .marquee-container {
            width: 100%;
            overflow: hidden;
            background: linear-gradient(90deg, rgba(31, 41, 55, 0) 0%, rgba(31, 41, 55, 1) 20%, rgba(31, 41, 55, 1) 80%, rgba(31, 41, 55, 0) 100%);
            margin: 0 0 30px 0;
            padding: 10px 0;
            position: relative;
            mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
            -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
        }

        .marquee-content {
            display: flex;
            gap: 20px;
            animation: scroll 400s linear infinite;
            width: max-content;
        }

        .marquee-content:hover {
            animation-play-state: paused;
        }

        @keyframes scroll {
            0% {
                transform: translateX(0);
            }

            100% {
                transform: translateX(-50%);
            }
        }

        .marquee-item {
            background: rgba(55, 65, 81, 0.8);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 50px;
            padding: 5px 15px 5px 5px;
            display: flex;
            align-items: center;
            gap: 10px;
            min-width: 180px;
            backdrop-filter: blur(5px);
            transition: transform 0.2s;
            cursor: pointer;
        }

        .marquee-item:hover {
            transform: scale(1.05);
            border-color: #3B82F6;
            background: rgba(59, 130, 246, 0.2);
        }

        .marquee-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid #3B82F6;
        }

        .marquee-info {
            display: flex;
            flex-direction: column;
            line-height: 1.2;
        }

        .marquee-name {
            font-weight: 700;
            color: #fff;
            font-size: 0.9em;
        }

        .marquee-points {
            font-size: 0.8em;
            color: #F59E0B;
            font-weight: 600;
        }

        .leaderboard-link-wrapper {
            text-align: center;
            margin-bottom: 40px;
        }

        .view-leaderboard-btn {
            background: linear-gradient(135deg, #3B82F6 0%, #2563EB 100%);
            color: white;
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
            transition: all 0.2s;
        }

        .view-leaderboard-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
        }

        /* Ghost Button for 'Continue without logging in' */
        #skipLoginBtn {
            background: transparent !important;
            color: #9CA3AF !important;
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 12px 24px;
            border-radius: 12px;
            font-size: 0.95em;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
            margin-top: 20px;
            width: 100%;
            text-align: center;
            display: block;
            /* Ensure it behaves like a block */
            outline: none;
        }

        #skipLoginBtn:hover {
            color: #E5E7EB;
            border-color: #4B5563;
            background: rgba(255, 255, 255, 0.05);
            transform: translateY(-1px);
        }

        #skipLoginBtn:focus {
            outline: none;
            box-shadow: 0 0 0 2px rgba(75, 85, 99, 0.4);
        }

        /* Search Box Refinement */
        .search-box {
            background: rgba(17, 24, 39, 0.8) !important;
            border: 1px solid #374151 !important;
            border-radius: 12px !important;
            padding: 16px !important;
            color: white !important;
            font-size: 1.1em !important;
            transition: all 0.2s ease;
            box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
        }

        .search-box:focus {
            outline: none !important;
            border-color: #3B82F6 !important;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2), inset 0 2px 4px rgba(0, 0, 0, 0.2) !important;
        }

        /* [NEW] Zero-Flicker Protection: Hide content by default */
        .protected-content {
            display: none !important;
        }

        #initialLoader {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: #111827;
            z-index: 3000;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: white;
            transition: opacity 0.5s;
        }

        #loginGate {
            display: none;
            /* Shown by JS if needed */
        }

        .online-file-card {
            background: rgba(255, 255, 255, 0.05);
            /* Glass feel */
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            padding: 20px;
            text-align: center;
            margin-top: 10px;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .online-file-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
            border-color: rgba(0, 159, 245, 0.3);
        }

        .online-cloud-icon {
            font-size: 3em;
            margin-bottom: 10px;
            filter: drop-shadow(0 0 10px rgba(0, 159, 245, 0.5));
        }

        .online-card-title {
            color: white;
            font-weight: 600;
            margin-bottom: 5px;
            font-size: 1.1em;
        }

        .online-card-desc {
            color: #94A3B8;
            font-size: 0.85em;
            margin-bottom: 15px;
            line-height: 1.4;
        }

        .online-open-btn {
            background: linear-gradient(135deg, #009FF5 0%, #0070c0 100%);
            border: none;
            color: white;
            padding: 10px 20px;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            transition: all 0.2s;
            box-shadow: 0 4px 12px rgba(0, 159, 245, 0.3);
        }

        .online-open-btn:hover {
            box-shadow: 0 6px 16px rgba(0, 159, 245, 0.5);
            transform: scale(1.02);
        }

        footer {
            text-align: center;
            padding: 1rem;
            margin-top: 2rem;
            font-size: 0.9em;
            color: #6c757d;
        }

        .modal-students-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
            gap: 15px;
            padding: 10px 0;
        }

        .modal-student-card {
            background: #374151;
            border-radius: 10px;
            padding: 10px 5px;
            display: flex;
            flex-direction: column;
            align-items: center;
            cursor: pointer;
            border: 1px solid transparent;
            transition: all 0.2s;
        }

        .modal-student-card:hover {
            background: #4B5563;
            border-color: #60A5FA;
            transform: translateY(-2px);
        }

        .modal-student-headshot {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid #60A5FA;
            margin-bottom: 8px;
            background-color: #1F2937;
        }

        .modal-student-initial {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: #3B82F6;
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5em;
            border: 2px solid #60A5FA;
            margin-bottom: 8px;
        }

        .modal-student-name {
            font-size: 0.85em;
            text-align: center;
            color: #E5E7EB;
            line-height: 1.2;
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        /* Updated Student Item Styling for Headshots */
        .student-item {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 12px 15px;
            cursor: pointer;
            border-bottom: 1px solid #374151;
            transition: background 0.2s ease;
        }

        .student-item:hover {
            background-color: #374151;
        }

        .student-headshot {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid #3B82F6;
        }

        .student-initial {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #374151;
            color: #E5E7EB;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2em;
            border: 2px solid #4B5563;
        }

        .student-name {
            font-size: 1.1em;
            color: #E5E7EB;
            font-weight: 500;
        }

        /* Adjust login modal to match theme */
        .login-modal-content {
            background: #1F2937;
            color: #E5E7EB;
            border-radius: 15px;
            border: 1px solid #374151;
        }

        #studentSearch {
            background: #111827;
            border: 1px solid #374151;
            color: #E5E7EB;
        }

        #studentSearch:focus {
            border-color: #3B82F6;
        }

        #studentList {
            max-height: 400px;
            overflow-y: auto;
            border: 1px solid #374151;
            border-radius: 8px;
            margin-top: 15px;
            background: #111827;
        }