:root {
            --primary: #00a8e0;
            --primary-dark: #0087b8;
            --secondary: #f06400;
            --dark: #1a1a2e;
            --light: #f8f9fa;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --transition: all 0.3s ease;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            --border-radius: 8px;
            --container-max: 1200px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: var(--light);
            font-size: 18px;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--secondary);
        }
        .my-logo a {
            color: inherit;
            text-decoration: none;
        }
        .my-logo a:hover {
            text-decoration: none;
            color: var(--primary-dark);
        }
        .search-form {
            flex-grow: 1;
            max-width: 500px;
            margin: 0 30px;
            position: relative;
        }
        .search-form input {
            width: 100%;
            padding: 12px 20px;
            border: 2px solid var(--light-gray);
            border-radius: 50px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-form input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 168, 224, 0.2);
        }
        .search-form button {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--gray);
            cursor: pointer;
            font-size: 1.2rem;
        }
        nav {
            background-color: var(--dark);
        }
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .main-nav {
            display: flex;
            list-style: none;
        }
        .main-nav li {
            position: relative;
        }
        .main-nav a {
            display: block;
            padding: 18px 20px;
            color: white;
            font-weight: 500;
            text-decoration: none;
            transition: var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: rgba(255, 255, 255, 0.1);
            text-decoration: none;
            color: var(--primary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 10px;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: var(--light-gray);
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: var(--gray);
        }
        .breadcrumb a {
            color: var(--gray);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        main {
            padding: 40px 0;
            background-color: white;
        }
        .article-header {
            margin-bottom: 40px;
            text-align: center;
            border-bottom: 1px solid var(--light-gray);
            padding-bottom: 30px;
        }
        .article-header h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
            color: var(--dark);
        }
        .meta-info {
            display: flex;
            justify-content: center;
            gap: 20px;
            color: var(--gray);
            font-size: 0.9rem;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }
        .meta-info i {
            margin-right: 5px;
        }
        .lead {
            font-size: 1.3rem;
            color: var(--gray);
            max-width: 800px;
            margin: 0 auto 30px;
            font-weight: 300;
        }
        .content-section {
            margin-bottom: 60px;
        }
        h2 {
            font-size: 2.2rem;
            margin: 40px 0 20px;
            color: var(--dark);
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary);
        }
        h3 {
            font-size: 1.8rem;
            margin: 30px 0 15px;
            color: var(--dark);
        }
        h4 {
            font-size: 1.4rem;
            margin: 25px 0 10px;
            color: var(--dark);
        }
        p {
            margin-bottom: 1.5em;
        }
        .highlight-box {
            background-color: var(--light-gray);
            border-left: 5px solid var(--secondary);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .highlight-box h3 {
            margin-top: 0;
            color: var(--secondary);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
            margin: 30px 0;
        }
        .stat-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--shadow);
            text-align: center;
            border-top: 4px solid var(--primary);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 15px;
        }
        .stat-value {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--dark);
            display: block;
            margin: 10px 0;
        }
        .stat-label {
            color: var(--gray);
            font-size: 1rem;
        }
        .image-container {
            margin: 40px 0;
            text-align: center;
        }
        .image-container img {
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: 0 auto;
        }
        .image-caption {
            font-style: italic;
            color: var(--gray);
            font-size: 0.9rem;
            margin-top: 10px;
        }
        .content-links {
            background-color: var(--light-gray);
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 30px 0;
        }
        .content-links h3 {
            margin-top: 0;
        }
        .content-links ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 10px;
        }
        .content-links li {
            margin-bottom: 8px;
        }
        .content-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 12px;
            background: white;
            border-radius: 5px;
            transition: var(--transition);
        }
        .content-links a:hover {
            background-color: var(--primary);
            color: white;
            text-decoration: none;
            transform: translateX(5px);
        }
        .content-links a:hover i {
            color: white;
        }
        .user-interaction {
            background-color: #f8f9fa;
            padding: 40px;
            border-radius: var(--border-radius);
            margin: 60px 0;
            border: 1px solid var(--light-gray);
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }
        .interaction-form h3 {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
        }
        .interaction-form h3 i {
            color: var(--primary);
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 168, 224, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .btn {
            display: inline-block;
            padding: 14px 28px;
            background-color: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: var(--primary-dark);
            text-decoration: none;
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0, 0, 0, 0.1);
        }
        .btn-secondary {
            background-color: var(--secondary);
        }
        .btn-secondary:hover {
            background-color: #d85a00;
        }
        .rating {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .stars {
            display: flex;
            gap: 10px;
            justify-content: center;
            font-size: 2rem;
        }
        .star {
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: gold;
        }
        footer {
            background-color: var(--dark);
            color: white;
            padding: 60px 0 30px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 20px;
            color: white;
        }
        .footer-about p {
            color: #aaa;
            margin-bottom: 20px;
        }
        .footer-links h3,
        .footer-social h3 {
            font-size: 1.2rem;
            margin-bottom: 20px;
            color: white;
            padding-bottom: 10px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #aaa;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--primary);
            text-decoration: none;
        }
        .social-icons {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: white;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background-color: var(--primary);
            transform: translateY(-5px);
        }
        friend-link {
            display: block;
            background-color: rgba(255, 255, 255, 0.05);
            padding: 30px;
            border-radius: var(--border-radius);
            margin: 40px 0;
        }
        friend-link h3 {
            color: white;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        friend-link ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
        }
        friend-link li {
            margin-bottom: 10px;
        }
        friend-link a {
            color: #aaa;
            padding: 10px 15px;
            background-color: rgba(255, 255, 255, 0.05);
            border-radius: 5px;
            display: block;
            transition: var(--transition);
        }
        friend-link a:hover {
            color: white;
            background-color: rgba(255, 255, 255, 0.1);
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .main-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--dark);
                flex-direction: column;
                align-items: center;
                padding: 20px 0;
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: var(--transition);
                box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
            }
            .main-nav.active {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav li {
                width: 100%;
                text-align: center;
            }
            .main-nav a {
                padding: 15px 20px;
            }
            .hamburger {
                display: block;
            }
            .header-top {
                flex-wrap: wrap;
            }
            .search-form {
                order: 3;
                max-width: 100%;
                margin: 20px 0 0;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .user-interaction {
                padding: 30px 20px;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            .container {
                padding: 0 15px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .content-links ul {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
            .article-header h1 {
                font-size: 1.8rem;
            }
        }