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

        :root {
            --primary-color: #667eea;
            --secondary-color: #764ba2;
            --accent-color: #f093fb;
            --success-color: #4CAF50;
            --warning-color: #FF9800;
            --error-color: #f44336;
            --text-dark: #2c3e50;
            --text-light: #666;
            --bg-light: #f8f9fa;
            --border-color: #e0e0e0;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.15);
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            text-align: center;
            margin-bottom: 2rem;
            color: white;
        }

        .header h1 {
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }

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

        .nav-tabs {
            display: flex;
            background: white;
            border-radius: 15px;
            padding: 5px;
            box-shadow: var(--shadow);
            margin-bottom: 2rem;
            overflow-x: auto;
            flex-wrap: wrap;
        }

        .nav-tab {
            flex: 1;
            min-width: 180px;
            padding: 15px 20px;
            border: none;
            background: transparent;
            border-radius: 10px;
            cursor: pointer;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-light);
            transition: all 0.3s ease;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .nav-tab:hover {
            background: var(--bg-light);
            color: var(--primary-color);
        }

        .nav-tab.active {
            background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
            color: white;
            box-shadow: var(--shadow);
        }

        .tab-content {
            display: none;
            background: white;
            border-radius: 20px;
            padding: 2rem;
            box-shadow: var(--shadow-hover);
            animation: fadeIn 0.5s ease;
        }

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

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

        .section-title {
            font-size: 2rem;
            margin-bottom: 1rem;
            color: var(--primary-color);
            text-align: center;
        }

        .question-card, .activity-card, .song-card, .result-card {
            background: var(--bg-light);
            border-radius: 15px;
            padding: 1.5rem;
            margin-bottom: 1rem;
            border: 2px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .question-card:hover, .activity-card:hover, .song-card:hover {
            border-color: var(--primary-color);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .option-btn, .btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 25px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }

        .option-btn:hover, .btn:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .option-btn.selected {
            background: var(--success-color);
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--text-dark);
        }

        .form-control {
            width: 100%;
            padding: 12px;
            border: 2px solid var(--border-color);
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
        }

        .grid {
            display: grid;
            gap: 1rem;
        }

        .grid-2 {
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        }

        .grid-3 {
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        }

        .stat-card {
            background: linear-gradient(45deg, var(--accent-color), var(--primary-color));
            color: white;
            border-radius: 15px;
            padding: 1.5rem;
            text-align: center;
        }

        .stat-number {
            font-size: 2rem;
            font-weight: bold;
            margin-bottom: 0.5rem;
        }

        .progress-bar {
            background: var(--border-color);
            border-radius: 10px;
            height: 20px;
            margin: 1rem 0;
            overflow: hidden;
        }

        .progress-fill {
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            height: 100%;
            border-radius: 10px;
            transition: width 0.3s ease;
        }

        .favorites-list {
            background: var(--bg-light);
            border-radius: 10px;
            padding: 1rem;
            margin: 1rem 0;
        }

        .favorite-item {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 0.75rem;
            margin-bottom: 0.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .remove-btn {
            background: var(--error-color);
            color: white;
            border: none;
            border-radius: 50%;
            width: 25px;
            height: 25px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .filter-section {
            background: var(--bg-light);
            border-radius: 15px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
        }

        .chart-container {
            background: white;
            border-radius: 10px;
            padding: 1rem;
            margin: 1rem 0;
            box-shadow: var(--shadow);
        }

        .bar-chart {
            display: flex;
            align-items: flex-end;
            height: 200px;
            gap: 10px;
            padding: 1rem 0;
        }

        .bar {
            flex: 1;
            background: linear-gradient(to top, var(--primary-color), var(--accent-color));
            border-radius: 5px 5px 0 0;
            position: relative;
            transition: all 0.3s ease;
        }

        .bar:hover {
            transform: scaleY(1.1);
        }

        .bar-label {
            position: absolute;
            bottom: -25px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 0.8rem;
            white-space: nowrap;
        }

        .bar-value {
            position: absolute;
            top: -25px;
            left: 50%;
            transform: translateX(-50%);
            font-size: 0.8rem;
            font-weight: bold;
        }

        .hidden {
            display: none;
        }

        .alert {
            padding: 1rem;
            border-radius: 8px;
            margin: 1rem 0;
        }

        .alert-success {
            background: #d4edda;
            color: #155724;
            border: 1px solid #c3e6cb;
        }

        .alert-warning {
            background: #fff3cd;
            color: #856404;
            border: 1px solid #ffeeba;
        }

        .alert-error {
            background: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 2rem;
            }
            
            .nav-tabs {
                flex-direction: column;
            }
            
            .nav-tab {
                min-width: auto;
            }
            
            .tab-content {
                padding: 1rem;
            }
            
            .grid-2, .grid-3 {
                grid-template-columns: 1fr;
            }
        }

        .icon {
            width: 20px;
            height: 20px;
            fill: currentColor;
        }

        .score-display {
            background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
            color: white;
            border-radius: 15px;
            padding: 1rem;
            text-align: center;
            margin: 1rem 0;
        }

        .timer {
            background: var(--warning-color);
            color: white;
            border-radius: 50%;
            width: 60px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: bold;
            margin: 1rem auto;
        }

        .category-filter {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1rem;
            flex-wrap: wrap;
        }

        .category-btn {
            padding: 8px 16px;
            border: 2px solid var(--primary-color);
            background: transparent;
            color: var(--primary-color);
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .category-btn.active, .category-btn:hover {
            background: var(--primary-color);
            color: white;
        }