:root {
            --primary-color: #6a1b9a;
            --primary-light: #9c4dcc;
            --primary-dark: #38006b;
            --secondary-color: #f8f9fa;
            --accent-color: #ffd700;
            --text-color: #333;
            --male-color: #3498db;
            --female-color: #e74c3c;
            --young-color: #2ecc71;
            --adult-color: #9b59b6;
            --old-color: #f39c12;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f5f5f5;
            color: var(--text-color);
        }
        
        .navbar {
            background-color: var(--primary-color) !important;
        }
        
        .navbar-brand {
            display: flex;
            align-items: center;
        }
        
        .logo {
            width: 40px;
            margin-right: 10px;
        }
        
        .navbar-light .navbar-nav .nav-link {
            color: white;
            font-weight: 500;
            padding: 0.5rem 1rem;
            transition: all 0.3s ease;
        }
        
        .navbar-light .navbar-nav .nav-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            border-radius: 4px;
        }
        
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
            color: white;
            border-radius: 10px;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            padding: 3rem 2rem;
            margin-top: 2rem;
            margin-bottom: 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 70%);
            transform: rotate(30deg);
        }
        
        .hero-section h1 {
            font-weight: 700;
            margin-bottom: 1rem;
            position: relative;
        }
        
        .hero-section p {
            font-size: 1.25rem;
            opacity: 0.9;
            position: relative;
        }
        
        .stats-card {
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            padding: 2rem;
            margin-bottom: 2rem;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .stats-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
        }
        
        .form-container {
            background: linear-gradient(135deg, #f8f9fa, #ffffff);
            border-radius: 15px;
            padding: 2.5rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            position: relative;
            overflow: hidden;
            border: 1px solid rgba(106, 27, 154, 0.1);
        }
        
        .form-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, var(--primary-color), var(--primary-light), var(--accent-color));
        }
        
        .form-label {
            font-weight: 600;
            color: var(--primary-dark);
            margin-bottom: 0.5rem;
        }
        
        .form-control {
            border: 2px solid rgba(106, 27, 154, 0.2);
            border-radius: 8px;
            padding: 0.75rem 1rem;
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(106, 27, 154, 0.25);
        }
        
        .form-control::placeholder {
            color: #adb5bd;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
            border: none;
            border-radius: 8px;
            padding: 0.75rem 2rem;
            font-weight: 600;
            letter-spacing: 0.5px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 10px rgba(106, 27, 154, 0.3);
        }
        
        .btn-primary:hover {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(106, 27, 154, 0.4);
        }
        
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 5px rgba(106, 27, 154, 0.4);
        }
        
        .btn-outline-primary {
            color: var(--primary-color);
            border-color: var(--primary-color);
        }
        
        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        
        .result-container {
            display: none;
            margin-top: 2rem;
        }
        
        .stat-number {
            font-size: 2.5rem;
            font-weight: bold;
            color: var(--primary-color);
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        
        .stat-card {
            text-align: center;
            padding: 1.5rem;
            border-radius: 12px;
            background: linear-gradient(135deg, #f8f9fa, #ffffff);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            border: 1px solid rgba(106, 27, 154, 0.1);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .stat-icon {
            font-size: 2.5rem;
            color: var(--accent-color);
            margin-bottom: 1rem;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        
        .footer a {
            color: white;
            text-decoration: none;
            transition: opacity 0.3s ease;
        }
        
        .footer a:hover {
            opacity: 0.8;
            text-decoration: none;
        }
        
        .loading {
            display: none;
            text-align: center;
            margin: 2rem 0;
        }
        
        .spinner-border {
            color: var(--primary-color);
            width: 3rem;
            height: 3rem;
        }
        
        .chart-container {
            position: relative;
            height: 300px;
            margin-bottom: 2rem;
        }
        
        .gender-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
        }
        
        .male-icon {
            color: var(--male-color);
        }
        
        .female-icon {
            color: var(--female-color);
        }
        
        .gender-percentage {
            font-size: 2rem;
            font-weight: bold;
        }
        
        .male-percentage {
            color: var(--male-color);
        }
        
        .female-percentage {
            color: var(--female-color);
        }
        
        .age-distribution {
            display: flex;
            height: 40px;
            border-radius: 20px;
            overflow: hidden;
            margin-bottom: 1rem;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .age-young {
            background-color: var(--young-color);
        }
        
        .age-adult {
            background-color: var(--adult-color);
        }
        
        .age-old {
            background-color: var(--old-color);
        }
        
        .age-legend {
            display: flex;
            justify-content: center;
            margin-bottom: 2rem;
        }
        
        .legend-item {
            display: flex;
            align-items: center;
            margin: 0 1rem;
        }
        
        .legend-color {
            width: 20px;
            height: 20px;
            border-radius: 4px;
            margin-right: 0.5rem;
        }
        
        .us-map-container {
            position: relative;
            height: 400px;
            margin-bottom: 2rem;
        }
        
        .state-tooltip {
            position: absolute;
            background-color: rgba(0, 0, 0, 0.8);
            color: white;
            padding: 0.5rem;
            border-radius: 4px;
            font-size: 0.875rem;
            z-index: 1000;
            pointer-events: none;
            display: none;
        }
        
        .tab-content {
            padding-top: 2rem;
        }
        
        .nav-tabs {
            border-bottom: 2px solid rgba(106, 27, 154, 0.2);
        }
        
        .nav-tabs .nav-link {
            color: var(--text-color);
            font-weight: 500;
            border: none;
            padding: 0.75rem 1.5rem;
            margin-right: 0.5rem;
            transition: all 0.3s ease;
            border-radius: 8px 8px 0 0;
        }
        
        .nav-tabs .nav-link:hover {
            background-color: rgba(106, 27, 154, 0.05);
        }
        
        .nav-tabs .nav-link.active {
            color: var(--primary-color);
            font-weight: 600;
            background-color: transparent;
            border-bottom: 3px solid var(--primary-color);
        }
        
        .progress {
            height: 25px;
            margin-bottom: 1rem;
            border-radius: 12px;
            background-color: rgba(106, 27, 154, 0.1);
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
        }
        
        .progress-bar {
            background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
            border-radius: 12px;
        }
        
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 25px;
            font-weight: 700;
            color: var(--primary-dark);
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
        }
        
        .famous-name-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            margin-bottom: 1.5rem;
        }
        
        .famous-name-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.15);
        }
        
        .famous-name-header {
            background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
            color: white;
            padding: 1rem;
            font-weight: 600;
        }
        
        .famous-name-body {
            padding: 1.5rem;
        }
        
        .famous-person {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid rgba(0,0,0,0.1);
        }
        
        .famous-person:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }
        
        .famous-person-icon {
            width: 40px;
            height: 40px;
            background-color: var(--primary-light);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            flex-shrink: 0;
        }
        
        .famous-person-info {
            flex-grow: 1;
        }
        
        .famous-person-name {
            font-weight: 600;
            margin-bottom: 0.25rem;
        }
        
        .famous-person-desc {
            font-size: 0.875rem;
            color: #666;
            margin-bottom: 0;
        }
        
        .top-name-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .top-name-item {
            display: flex;
            align-items: center;
            padding: 0.75rem 0;
            border-bottom: 1px solid rgba(0,0,0,0.1);
        }
        
        .top-name-item:last-child {
            border-bottom: none;
        }
        
        .top-name-rank {
            width: 30px;
            height: 30px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            font-weight: 600;
            flex-shrink: 0;
        }
        
        .top-name-info {
            flex-grow: 1;
        }
        
        .top-name {
            font-weight: 600;
            margin-bottom: 0.25rem;
        }
        
        .top-name-count {
            font-size: 0.875rem;
            color: #666;
        }
        
        .faq-item {
            margin-bottom: 1.5rem;
        }
        
        .faq-question {
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--primary-dark);
        }
        
        .faq-answer {
            color: #555;
        }
        
        .challenge-card {
            background: linear-gradient(135deg, #f8f9fa, #ffffff);
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin-bottom: 1.5rem;
            border-left: 5px solid var(--primary-color);
        }
        
        .challenge-title {
            font-weight: 600;
            color: var(--primary-dark);
            margin-bottom: 1rem;
        }
        
        .challenge-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .cultural-influence-card {
            background-color: white;
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin-bottom: 1.5rem;
            transition: transform 0.3s ease;
        }
        
        .cultural-influence-card:hover {
            transform: translateY(-5px);
        }
        
        .cultural-influence-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .cultural-influence-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        
        @media (max-width: 768px) {
            .hero-section, .stats-card {
                padding: 1.5rem;
            }
            
            .stat-number {
                font-size: 2rem;
            }
            
            .chart-container {
                height: 250px;
            }
            
            .us-map-container {
                height: 300px;
            }
            
            .form-container {
                padding: 1.5rem;
            }
            
            .nav-tabs .nav-link {
                padding: 0.5rem 1rem;
            }
        }