:root {
            --primary: #FF6B35; 
            --secondary: #00B4D8; 
            --dark: #2D3047;
            --light: #F8F9FA;
            --gray: #6C757D;
            --success: #38B000;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --border-radius: 12px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f0f2f5;
            color: var(--dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--dark) 0%, #1a1c2f 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(to right, var(--primary), #FF9E6D);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            font-size: 2rem;
            background: none;
            -webkit-text-fill-color: var(--primary);
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .desktop-nav a {
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .desktop-nav a:hover {
            color: var(--primary);
        }
        .desktop-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--primary);
            transition: width 0.3s;
        }
        .desktop-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background-color: var(--dark);
            flex-direction: column;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            z-index: 999;
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav ul {
            list-style: none;
            width: 100%;
        }
        .mobile-nav li {
            width: 100%;
            text-align: center;
        }
        .mobile-nav a {
            display: block;
            padding: 1rem;
            font-weight: 600;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .mobile-nav a:hover {
            background-color: rgba(255,107,53,0.1);
            color: var(--primary);
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
            text-decoration: underline;
        }
        .breadcrumb span {
            margin: 0 5px;
        }
        .search-section {
            background: white;
            padding: 2rem 0;
            border-bottom: 1px solid #dee2e6;
        }
        .search-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .search-input {
            flex-grow: 1;
            padding: 1rem 1.5rem;
            border: none;
            font-size: 1rem;
            outline: none;
        }
        .search-button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0 1.8rem;
            cursor: pointer;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        .search-button:hover {
            background: #e55a2b;
        }
        main {
            padding: 2rem 0;
        }
        .article-header {
            text-align: center;
            margin-bottom: 3rem;
            padding-bottom: 2rem;
            border-bottom: 2px dashed #ddd;
        }
        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: 1rem;
            color: var(--dark);
            line-height: 1.2;
        }
        .article-meta {
            color: var(--gray);
            font-size: 0.95rem;
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .article-content {
            background: white;
            padding: 3rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin-bottom: 3rem;
        }
        .article-content h2 {
            color: var(--primary);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #f0f0f0;
            font-size: 1.8rem;
        }
        .article-content h3 {
            color: var(--secondary);
            margin: 2rem 0 1rem;
            font-size: 1.5rem;
        }
        .article-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .article-content strong {
            color: var(--dark);
            font-weight: 700;
        }
        .article-content em {
            color: var(--gray);
        }
        .highlight-box {
            background: linear-gradient(to right, rgba(255,107,53,0.05), rgba(0,180,216,0.05));
            border-left: 5px solid var(--primary);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2.5rem 0;
            box-shadow: 0 0 10px rgba(0,0,0,0.05);
        }
        .comparison-table th {
            background-color: var(--dark);
            color: white;
            padding: 1.2rem;
            text-align: left;
        }
        .comparison-table td {
            padding: 1rem 1.2rem;
            border-bottom: 1px solid #eee;
        }
        .comparison-table tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        .comparison-table tr:hover {
            background-color: rgba(255,107,53,0.05);
        }
        .stumble-badge {
            background-color: rgba(255,107,53,0.1);
            color: var(--primary);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .fall-badge {
            background-color: rgba(0,180,216,0.1);
            color: var(--secondary);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 600;
            font-size: 0.9rem;
        }
        .feature-image {
            width: 100%;
            margin: 2.5rem auto;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .feature-image img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .feature-image:hover img {
            transform: scale(1.02);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            padding: 0.8rem;
            background: #f8f9fa;
            font-size: 0.95rem;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .stat-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            text-align: center;
            border-top: 5px solid var(--primary);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.12);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 1rem;
        }
        .stat-card h4 {
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
        }
        .stat-card .number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--dark);
            line-height: 1;
        }
        .interaction-section {
            background: white;
            padding: 3rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin-bottom: 3rem;
        }
        .interaction-section h2 {
            color: var(--dark);
            margin-bottom: 2rem;
            text-align: center;
            font-size: 2rem;
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        .interaction-card {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: var(--border-radius);
            border: 1px solid #e9ecef;
        }
        .interaction-card h3 {
            color: var(--primary);
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interaction-card form {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .form-group label {
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            padding: 0.8rem 1rem;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(255,107,53,0.2);
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            direction: rtl; 
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars input:checked ~ label,
        .rating-stars label:hover,
        .rating-stars label:hover ~ label {
            color: #FFC107;
        }
        .submit-button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 1rem;
        }
        .submit-button:hover {
            background: #e55a2b;
            transform: translateY(-2px);
        }
        .web-links-section {
            background: var(--dark);
            padding: 3rem 0;
            color: white;
        }
        .web-links-section h3 {
            text-align: center;
            margin-bottom: 2rem;
            font-size: 1.8rem;
            color: #fff;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
        }
        .web-link {
            background: rgba(255,255,255,0.05);
            padding: 1.2rem;
            border-radius: 8px;
            transition: var(--transition);
            border-left: 4px solid transparent;
        }
        .web-link:hover {
            background: rgba(255,255,255,0.1);
            border-left-color: var(--primary);
            transform: translateX(5px);
        }
        .web-link a {
            display: block;
            color: #e9ecef;
        }
        .web-link a:hover {
            color: var(--primary);
        }
        footer {
            background: #1a1c2f;
            color: #adb5bd;
            padding: 3rem 0 1.5rem;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            flex: 1;
            min-width: 250px;
        }
        .footer-logo .logo {
            font-size: 2rem;
            margin-bottom: 1rem;
        }
        .footer-links {
            flex: 2;
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
        }
        .footer-column {
            flex: 1;
            min-width: 150px;
        }
        .footer-column h4 {
            color: white;
            margin-bottom: 1.2rem;
            font-size: 1.2rem;
        }
        .footer-column ul {
            list-style: none;
        }
        .footer-column li {
            margin-bottom: 0.8rem;
        }
        .footer-column a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        .social-icons {
            display: flex;
            gap: 1rem;
            margin-top: 1rem;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            font-size: 1.2rem;
        }
        .social-icons a:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-3px);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .article-header h1 {
                font-size: 2.4rem;
            }
            .article-content {
                padding: 2rem;
            }
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-header h1 {
                font-size: 2rem;
            }
            .article-content {
                padding: 1.5rem;
            }
            .interaction-section {
                padding: 2rem;
            }
            .footer-content {
                flex-direction: column;
            }
        }
        @media (max-width: 576px) {
            .container {
                padding: 0 15px;
            }
            .article-header h1 {
                font-size: 1.8rem;
            }
            .article-meta {
                flex-direction: column;
                gap: 0.5rem;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .comparison-table {
                font-size: 0.9rem;
            }
            .comparison-table th,
            .comparison-table td {
                padding: 0.8rem;
            }
        }