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

        /* Hide main body scrollbar */
        html {
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        html::-webkit-scrollbar {
            display: none;
        }

        /* Custom scrollbar for content area */
        .content::-webkit-scrollbar {
            width: 8px;
        }

        .content::-webkit-scrollbar-track {
            background: transparent;
        }

        .content::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 4px;
            transition: all 0.3s ease;
        }

        .content::-webkit-scrollbar-thumb:hover {
            background: var(--accent);
        }

        :root {
            --bg-primary: #ffffff;
            --bg-secondary: #f8f9fa;
            --bg-tertiary: #e9ecef;
            --text-primary: #1a1a2e;
            --text-secondary: #555d7b;
            --border-color: #e0e4f7;
            --accent: #6366f1;
            --accent-dark: #4f46e5;
            --header-start: #6366f1;
            --header-end: #d946ef;
        }

        body.dark-mode {
            --bg-primary: #1a1a1a;
            --bg-secondary: #2d2d2d;
            --bg-tertiary: #3d3d3d;
            --text-primary: #e8e8e8;
            --text-secondary: #a8a8a8;
            --border-color: #444444;
        }

        body.dark-mode .chart-container {
            background: linear-gradient(135deg, #252525 0%, #2d2d2d 100%) !important;
            border: 1px solid #3a3a3a;
        }

        body.dark-mode .stat-card {
            background: linear-gradient(135deg, #2d2d2d 0%, #252525 100%) !important;
            border: 1px solid #3a3a3a;
        }

        body.dark-mode .stat-card .big-number {
            color: #6366f1;
        }

        body.dark-mode .heatmap-container {
            background: transparent !important;
        }

        body.dark-mode .heatmap-table {
            background: #252525;
            border: 1px solid #3a3a3a;
        }

        body.dark-mode .heatmap-table th {
            background: #2d2d2d;
            border-color: #3a3a3a;
        }

        body.dark-mode .heatmap-table td {
            border-color: #3a3a3a;
        }

        body.dark-mode .subject-grid {
            background: transparent !important;
        }

        body.dark-mode .subject-card {
            background: linear-gradient(135deg, #2d2d2d 0%, #252525 100%);
            border: 1px solid #3a3a3a;
        }

        body.dark-mode .weak-areas-container {
            background: transparent !important;
        }

        body.dark-mode #weakAreasContainer,
        body.dark-mode #problemPapersContainer {
            background: #252525 !important;
            border: 1px solid #3a3a3a;
        }

        body.dark-mode #weakAreasContainer table,
        body.dark-mode #problemPapersContainer table {
            background: transparent;
        }

        body.dark-mode #weakAreasContainer th,
        body.dark-mode #problemPapersContainer th {
            background: #2d2d2d;
        }

        body.dark-mode #subjectTrendsContainer {
            background: transparent !important;
        }

        body.dark-mode .trend-card {
            background: linear-gradient(135deg, #2d2d2d 0%, #252525 100%) !important;
            border: 1px solid #3a3a3a;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            font-size: 16px;
            background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
            background-attachment: fixed;
            height: 100vh;
            overflow: hidden;
            color: var(--text-primary);
            transition: background 0.5s ease;
        }

        body.dark-mode {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
            background-attachment: fixed;
        }

        .container {
            width: 100%;
            height: 100%;
            background: var(--bg-primary);
            border-radius: 0;
            box-shadow: none;
            overflow: hidden;
            animation: slideUp 0.6s ease-out;
            display: flex;
            flex-direction: column;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .header {
            background: linear-gradient(135deg, var(--header-start) 0%, var(--header-end) 100%);
            color: white;
            padding: 35px 40px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            animation: fadeIn 0.8s ease-out;
            flex-shrink: 0;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .header-left h1 {
            font-size: 2.5em;
            margin-bottom: 8px;
            font-weight: 700;
        }

        .header-left p {
            font-size: 1.1em;
            opacity: 0.9;
        }

        .header-controls {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        .theme-toggle, .theme-editor-btn {
            background: rgba(255,255,255,0.15);
            border: 2px solid rgba(255,255,255,0.4);
            color: white;
            padding: 8px 15px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.9em;
            transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

        .theme-toggle:hover, .theme-editor-btn:hover {
            background: rgba(255,255,255,0.25);
            border-color: rgba(255,255,255,0.6);
            transform: translateY(-2px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.2);
        }

        .theme-editor-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.6);
            z-index: 2000;
            align-items: center;
            justify-content: center;
        }

        .theme-editor-modal.active {
            display: flex;
        }

        .theme-editor-content {
            background: var(--bg-primary);
            padding: 30px;
            border-radius: 15px;
            max-width: 500px;
            max-height: 80vh;
            overflow-y: auto;
            color: var(--text-primary);
        }

        .theme-editor-content h2 {
            margin-bottom: 20px;
            color: var(--accent-dark);
        }

        .preset-themes {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
            margin-bottom: 25px;
        }

        .preset-btn {
            padding: 12px;
            border: 2px solid var(--border-color);
            border-radius: 10px;
            background: var(--bg-secondary);
            color: var(--text-primary);
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            animation: fadeIn 0.4s ease-out;
        }

        .preset-btn:hover {
            border-color: var(--accent);
            transform: scale(1.08) translateY(-3px);
            box-shadow: 0 6px 16px rgba(99, 102, 241, 0.2);
        }

        .preset-btn.active {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
            color: white;
            border-color: var(--accent);
            box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
            animation: pulse 0.4s ease-out;
        }

        .color-picker-group {
            margin-bottom: 15px;
        }

        .color-picker-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 0.9em;
            color: var(--text-primary);
        }

        .color-picker-group input[type="color"] {
            width: 100%;
            height: 45px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            cursor: pointer;
        }

        .color-picker-group input[type="color"]:hover {
            border-color: var(--accent);
        }

        .theme-editor-buttons {
            display: flex;
            gap: 10px;
            margin-top: 20px;
            justify-content: flex-end;
        }

        .theme-editor-buttons button {
            padding: 10px 20px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s;
        }

        .theme-editor-buttons .btn-primary {
            background: var(--accent);
            color: white;
        }

        .theme-editor-buttons .btn-primary:hover {
            opacity: 0.9;
        }

        .theme-editor-buttons .btn-secondary {
            background: var(--bg-secondary);
            color: var(--text-primary);
            border: 2px solid var(--border-color);
        }

        .theme-editor-buttons .btn-secondary:hover {
            border-color: var(--accent);
        }

        .close-theme-editor {
            background: none;
            border: none;
            font-size: 1.5em;
            cursor: pointer;
            color: var(--text-secondary);
            padding: 0;
        }

        .main-content {
            display: flex;
            flex: 1;
            overflow: hidden;
        }

        .sidebar {
            width: 280px;
            background: var(--bg-secondary);
            border-right: 2px solid var(--border-color);
            overflow-y: auto;
            padding: 30px;
            flex-shrink: 0;
        }

        .sidebar h3 {
            color: var(--accent-dark);
            margin-bottom: 15px;
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .tab-buttons {
            display: flex;
            flex-direction: column;
            gap: 8px;
            margin-bottom: 25px;
        }

        .tab-btn, .subject-btn {
            width: 100%;
            padding: 12px;
            border: 2px solid transparent;
            background: var(--bg-primary);
            border-radius: 8px;
            cursor: pointer;
            font-size: 1em;
            text-align: left;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            color: var(--text-primary);
        }

        .tab-btn:hover, .subject-btn:hover {
            background: var(--bg-tertiary);
            border-color: var(--accent);
            transform: translateX(4px);
        }

        .tab-btn.active, .subject-btn.active {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
            color: white;
            border-color: var(--accent);
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
            animation: slideIn 0.4s ease-out;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(-10px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        .subject-list {
            margin-top: 15px;
            border-top: 2px solid var(--border-color);
            padding-top: 15px;
        }

        .content {
            flex: 1;
            padding: 50px;
            overflow-y: auto;
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        .subject-title {
            color: var(--accent-dark);
            margin-bottom: 40px;
            font-size: 2.8em;
            font-weight: 700;
        }

        .progress-section {
            background: linear-gradient(135deg, var(--header-start) 0%, var(--header-end) 100%);
            color: white;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 30px;
            animation: slideUp 0.6s ease-out 0.1s both;
            box-shadow: 0 10px 30px rgba(99, 102, 241, 0.25);
        }

        .progress-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
            margin-bottom: 15px;
        }

        .progress-item h4 {
            font-size: 0.9em;
            opacity: 0.9;
            margin-bottom: 8px;
        }

        .progress-item p {
            font-size: 1.8em;
            font-weight: bold;
        }

        .button-group {
            display: flex;
            gap: 10px;
        }

        .btn {
            padding: 12px 28px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1em;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            color: white;
            font-weight: 600;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(99, 102, 241, 0.3);
        }

        .btn:active {
            transform: translateY(0);
        }

        .btn-secondary {
            background: #6c757d;
        }

        .btn-secondary:hover {
            background: #5a6268;
        }

        .btn-danger {
            background: #dc3545;
        }

        .btn-danger:hover {
            background: #c82333;
        }

        .btn-success {
            background: #28a745;
        }

        .btn-success:hover {
            background: #218838;
        }

        .sessions-grid {
            display: grid;
            gap: 25px;
        }

        .session {
            background: var(--bg-secondary);
            padding: 25px;
            border-radius: 10px;
            border-left: 5px solid var(--accent);
            animation: slideUp 0.5s ease-out backwards;
            transition: all 0.3s ease;
        }

        .session:hover {
            box-shadow: 0 8px 20px rgba(99, 102, 241, 0.15);
            transform: translateY(-2px);
        }

        .session-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 15px;
        }

        .session-title {
            color: var(--accent-dark);
            font-size: 1.3em;
            font-weight: 600;
        }

        .session-total {
            background: var(--accent-dark);
            color: white;
            padding: 8px 15px;
            border-radius: 20px;
            font-weight: bold;
            font-size: 0.95em;
        }

        .papers {
            display: grid;
            gap: 15px;
        }

        .paper {
            background: var(--bg-primary);
            padding: 18px 20px;
            border-radius: 8px;
            border: 2px solid var(--border-color);
            display: grid;
            grid-template-columns: 100px 140px 90px 1fr auto;
            gap: 18px;
            align-items: center;
            transition: all 0.3s ease;
            animation: fadeIn 0.4s ease-out;
        }

        .paper:hover {
            border-color: var(--accent);
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1);
        }

        @media (max-width: 1200px) {
            .paper {
                grid-template-columns: 80px 110px 70px auto;
                row-gap: 8px;
            }

            .emoji-rating {
                grid-column: 1 / -1;
                justify-content: flex-start;
            }

            .note-btn {
                grid-column: 1 / -1;
                justify-self: flex-start;
            }
        }

        .paper-label {
            font-weight: 600;
            color: var(--accent-dark);
            min-width: 100px;
        }

        .paper-input {
            display: flex;
            gap: 10px;
            align-items: center;
        }

        .paper-input input {
            width: 60px;
            padding: 8px;
            border: 2px solid var(--border-color);
            border-radius: 5px;
            font-size: 1em;
            font-weight: 600;
            background: var(--bg-primary);
            color: var(--text-primary);
        }

        .paper-input input:focus {
            outline: none;
            border-color: var(--accent);
        }

        .paper-input span {
            color: var(--text-secondary);
            font-size: 0.95em;
            min-width: 30px;
        }

        .percentage {
            background: #e3f2fd;
            padding: 8px 12px;
            border-radius: 5px;
            font-weight: 600;
            color: #1F4E78;
            min-width: 70px;
            text-align: center;
        }

        body.dark-mode .percentage {
            background: #1a3a52;
            color: #64b5f6;
        }

        .emoji-rating {
            display: flex;
            gap: 6px;
            align-items: center;
            justify-content: center;
        }

        .emoji-btn {
            background: transparent;
            border: none;
            border-radius: 50%;
            padding: 4px 4px;
            cursor: pointer;
            font-size: 1.4em;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            position: relative;
        }

        .emoji-btn:hover {
            transform: scale(1.3) rotate(-5deg);
            background: var(--bg-secondary);
            border-radius: 50%;
        }

        .emoji-btn.selected {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
            transform: scale(1.4) rotate(10deg);
            box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
            animation: pulse 0.5s ease-out;
        }

        @keyframes pulse {
            0% { transform: scale(1.2); }
            50% { transform: scale(1.5); }
            100% { transform: scale(1.4) rotate(10deg); }
        }

        .emoji-label {
            font-size: 0.7em;
            color: var(--text-secondary);
            display: none;
            position: absolute;
            bottom: -20px;
            white-space: nowrap;
            left: 50%;
            transform: translateX(-50%);
            background: var(--bg-secondary);
            padding: 2px 6px;
            border-radius: 4px;
            opacity: 0;
            pointer-events: none;
        }

        .emoji-btn:hover .emoji-label {
            opacity: 1;
        }

        .note-btn {
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--accent);
            padding: 6px 12px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 0.8em;
            font-weight: 600;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .note-btn:hover {
            background: var(--accent);
            color: white;
            transform: scale(1.05);
        }

        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.4);
            z-index: 1000;
            align-items: center;
            justify-content: center;
            animation: fadeIn 0.3s ease-out;
            backdrop-filter: blur(2px);
        }

        .modal.active {
            display: flex;
        }

        .modal-content {
            background: var(--bg-primary);
            padding: 30px;
            border-radius: 15px;
            width: 90%;
            max-width: 600px;
            max-height: 80vh;
            overflow-y: auto;
            animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
            box-shadow: 0 20px 60px rgba(99, 102, 241, 0.3);
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 15px;
        }

        .modal-header h2 {
            color: var(--accent-dark);
        }

        .close-btn {
            background: none;
            border: none;
            font-size: 1.5em;
            cursor: pointer;
            color: var(--text-secondary);
        }

        .modal textarea {
            width: 100%;
            min-height: 200px;
            padding: 15px;
            border: 2px solid var(--border-color);
            border-radius: 5px;
            font-family: inherit;
            font-size: 1em;
            background: var(--bg-secondary);
            color: var(--text-primary);
            resize: vertical;
            margin-bottom: 15px;
        }

        .dashboard-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }

        .chart-container {
            background: var(--bg-secondary);
            padding: 25px;
            border-radius: 10px;
            position: relative;
            height: 400px;
        }

        .chart-container h3 {
            color: var(--accent-dark);
            margin-bottom: 20px;
        }

        .subject-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .subject-card {
            background: var(--bg-secondary);
            padding: 25px;
            border-radius: 10px;
            border-left: 5px solid var(--accent);
        }

        .subject-card h3 {
            color: var(--accent-dark);
            margin-bottom: 15px;
        }

        .subject-stats {
            display: grid;
            gap: 10px;
            font-size: 0.95em;
        }

        .stat-row {
            display: flex;
            justify-content: space-between;
            padding: 8px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .stat-value {
            font-weight: 600;
            color: var(--accent);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 40px;
        }

        .papers-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
            margin-top: 20px;
        }

        .session-block {
            background: var(--bg-secondary);
            border: 2px solid var(--border-color);
            border-radius: 10px;
            padding: 20px;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            cursor: pointer;
        }

        .session-block:hover {
            border-color: var(--accent);
            box-shadow: 0 8px 20px rgba(99, 102, 241, 0.2);
            transform: translateY(-4px);
        }

        .session-header {
            font-weight: 700;
            color: var(--accent-dark);
            font-size: 1.1em;
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--accent);
            text-align: center;
        }

        .session-papers {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
            gap: 15px;
        }

        .paper-column {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            padding: 12px;
            background: var(--bg-primary);
            border-radius: 8px;
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .paper-column:hover {
            border-color: var(--accent);
            background: var(--bg-tertiary);
        }

        .paper-label {
            font-weight: 700;
            color: var(--accent-dark);
            font-size: 1em;
        }

        .paper-score {
            font-size: 0.9em;
            color: var(--text-primary);
            font-weight: 600;
        }

        .paper-percentage {
            text-align: center;
            padding: 6px 8px;
            border-radius: 4px;
            font-weight: 700;
            font-size: 0.9em;
            width: 100%;
        }

        .paper-percentage.excellent {
            background: rgba(16, 185, 129, 0.2);
            color: #10b981;
        }

        .paper-percentage.good {
            background: rgba(59, 130, 246, 0.2);
            color: #3b82f6;
        }

        .paper-percentage.average {
            background: rgba(245, 158, 11, 0.2);
            color: #f59e0b;
        }

        .paper-percentage.poor {
            background: rgba(239, 68, 68, 0.2);
            color: #ef4444;
        }

        .paper-percentage.empty {
            background: var(--bg-secondary);
            color: var(--text-secondary);
        }

        .paper-emoji {
            font-size: 1.5em;
        }

        .stat-card {
            background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
            padding: 25px;
            border-radius: 12px;
            border: 2px solid var(--border-color);
            transition: all 0.3s ease;
            animation: slideUp 0.5s ease-out backwards;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 24px rgba(99, 102, 241, 0.15);
            border-color: var(--accent);
        }

        .stat-card h4 {
            color: var(--text-secondary);
            font-size: 0.9em;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
        }

        .stat-card .big-number {
            font-size: 2.5em;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 8px;
        }

        .stat-card .sub-text {
            font-size: 0.85em;
            color: var(--text-secondary);
        }

        .heatmap-container {
            background: var(--bg-secondary);
            padding: 30px;
            border-radius: 12px;
            overflow-x: auto;
            margin-top: 30px;
        }

        .heatmap-container h3 {
            color: var(--accent-dark);
            margin-bottom: 20px;
            font-size: 1.3em;
        }

        .heatmap-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.9em;
        }

        .heatmap-table th, .heatmap-table td {
            padding: 15px;
            text-align: center;
            border: 1px solid var(--border-color);
        }

        .heatmap-table th {
            background: var(--bg-primary);
            font-weight: 700;
            color: var(--accent-dark);
        }

        .heatmap-subject-label {
            text-align: left;
            font-weight: 600;
            color: var(--text-primary);
        }

        .heatmap-cell {
            border-radius: 8px;
            font-weight: 600;
            transition: all 0.3s ease;
            cursor: pointer;
            color: white;
            text-shadow: 0 1px 2px rgba(0,0,0,0.2);
        }

        .heatmap-cell:hover {
            transform: scale(1.1);
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
        }

        .heatmap-cell.excellent {
            background: linear-gradient(135deg, #10b981 0%, #059669 100%);
        }

        .heatmap-cell.good {
            background: linear-gradient(135deg, #84cc16 0%, #65a30d 100%);
        }

        .heatmap-cell.fair {
            background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
        }

        .heatmap-cell.poor {
            background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
        }

        .heatmap-cell.not-done {
            background: var(--bg-tertiary);
            color: var(--text-secondary);
        }

        .heatmap-legend {
            display: flex;
            gap: 20px;
            margin-top: 20px;
            flex-wrap: wrap;
            padding: 15px;
            background: var(--bg-primary);
            border-radius: 8px;
        }

        .legend-item {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .legend-color {
            width: 24px;
            height: 24px;
            border-radius: 4px;
        }

        @media (max-width: 768px) {
            .main-content {
                flex-direction: column;
            }

            .sidebar {
                width: 100%;
                max-height: none;
                border-right: none;
                border-bottom: 2px solid var(--border-color);
            }

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

            .progress-grid {
                grid-template-columns: repeat(2, 1fr);
            }

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

            .header {
                flex-direction: column;
                gap: 15px;
            }
        }

        /* Trends & Analysis Styles */
        .stat-item {
            background: var(--bg-secondary);
            padding: 15px;
            border-radius: 8px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .stat-item span {
            color: var(--text-secondary);
            font-size: 0.9em;
        }

        .stat-item strong {
            color: var(--accent-dark);
            font-size: 1.2em;
        }

        .trend-card {
            background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
            padding: 15px;
            border-radius: 10px;
            border-left: 4px solid var(--accent);
        }

        .trend-card h4 {
            margin: 0 0 10px 0;
            color: var(--accent-dark);
        }

        .trend-info {
            display: flex;
            justify-content: space-between;
            font-size: 0.9em;
        }

        .trend-direction {
            font-size: 1.5em;
            font-weight: bold;
        }

        .trend-direction.improving { color: #10b981; }
        .trend-direction.declining { color: #ef4444; }
        .trend-direction.stable { color: #f59e0b; }

        #problemPapersContainer table {
            width: 100%;
            border-collapse: collapse;
        }

        #problemPapersContainer th {
            background: var(--bg-primary);
            color: var(--accent-dark);
            padding: 12px;
            text-align: left;
            font-weight: 600;
            border-bottom: 2px solid var(--border-color);
        }

        #problemPapersContainer td {
            padding: 10px 12px;
            border-bottom: 1px solid var(--border-color);
        }

        #problemPapersContainer tr:hover {
            background: var(--bg-primary);
        }

        .problem-badge {
            display: inline-block;
            padding: 4px 8px;
            background: #ef4444;
            color: white;
            border-radius: 4px;
            font-size: 0.85em;
            font-weight: 600;
        }

        /* Import/Export Modal Styles */
        .modal-section {
            margin-bottom: 20px;
        }

        .modal-section h3 {
            color: var(--accent-dark);
            font-size: 1.1em;
            margin-bottom: 12px;
        }

        #importFile {
            padding: 10px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            font-size: 0.95em;
            cursor: pointer;
        }

        #conflictResolution {
            border: 1px solid var(--border-color);
            padding: 8px 12px;
            border-radius: 5px;
            background: var(--bg-secondary);
            color: var(--text-primary);
            font-size: 0.9em;
        }

        .import-export-tabs {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
            border-bottom: 2px solid var(--border-color);
        }

        .import-export-tabs .tab-btn {
            padding: 10px 15px;
            border: none;
            background: none;
            color: var(--text-secondary);
            cursor: pointer;
            font-size: 0.9em;
            border-bottom: 3px solid transparent;
            margin-bottom: -2px;
            transition: all 0.3s ease;
        }

        .import-export-tabs .tab-btn.active {
            color: var(--accent-dark);
            border-bottom-color: var(--accent);
        }

        @media print {
            body, .container {
                background: white;
            }
            .header-controls, .sidebar, .button-group, .emoji-rating, .note-btn {
                display: none !important;
            }
            .paper {
                grid-template-columns: 80px 110px 70px !important;
            }
        }