:root {
            --primary-color: #4a6fa5; 
            --secondary-color: #ff9900; 
            --accent-color: #2ecc71; 
            --dark-color: #2c3e50;
            --light-color: #ecf0f1;
            --gray-color: #7f8c8d;
            --text-color: #333;
            --text-light: #fff;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
            --border-radius: 8px;
            --max-width: 1200px;
            --header-height: 80px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: #f9f9f9;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul, ol {
            list-style-position: inside;
            padding-left: 1.2em;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        section {
            padding: 60px 0;
        }
        .section-title {
            font-size: 2.2rem;
            margin-bottom: 1.5rem;
            color: var(--dark-color);
            position: relative;
            padding-bottom: 10px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background-color: var(--secondary-color);
            color: var(--text-light);
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            background-color: #e68900;
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        header {
            background-color: var(--dark-color);
            color: var(--text-light);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
            height: var(--header-height);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 100%;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            display: flex;
            align-items: center;
        }
        .my-logo {
            color: var(--secondary-color);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo span {
            color: var(--light-color);
        }
        .nav-desktop {
            display: flex;
        }
        .nav-desktop ul {
            display: flex;
            gap: 25px;
        }
        .nav-desktop a {
            font-weight: 500;
            padding: 8px 0;
            position: relative;
        }
        .nav-desktop a:hover {
            color: var(--secondary-color);
        }
        .nav-desktop a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            transition: var(--transition);
        }
        .nav-desktop a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--light-color);
        }
        .nav-mobile {
            display: none;
            position: absolute;
            top: var(--header-height);
            left: 0;
            width: 100%;
            background-color: var(--dark-color);
            flex-direction: column;
            padding: 20px;
            box-shadow: 0 10px 15px rgba(0,0,0,0.2);
            transform: translateY(-100%);
            opacity: 0;
            transition: transform 0.4s ease, opacity 0.4s ease;
        }
        .nav-mobile.active {
            transform: translateY(0);
            opacity: 1;
        }
        .nav-mobile ul {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .nav-mobile a {
            display: block;
            padding: 12px;
            border-radius: var(--border-radius);
            font-weight: 500;
        }
        .nav-mobile a:hover {
            background-color: rgba(255, 255, 255, 0.1);
            color: var(--secondary-color);
        }
        .breadcrumb {
            background-color: var(--light-color);
            padding: 15px 0;
            font-size: 0.9rem;
            color: var(--gray-color);
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding-left: 0;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: #aaa;
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .hero {
            background: linear-gradient(135deg, var(--primary-color) 0%, #6a89cc 100%);
            color: var(--text-light);
            text-align: center;
            padding: 80px 0;
        }
        .hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 0;
        }
        .article-body {
            background: #fff;
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .article-body h2 {
            font-size: 1.8rem;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            color: var(--dark-color);
            border-left: 5px solid var(--primary-color);
            padding-left: 15px;
        }
        .article-body h3 {
            font-size: 1.5rem;
            margin-top: 2rem;
            margin-bottom: 0.8rem;
            color: var(--primary-color);
        }
        .article-body h4 {
            font-size: 1.2rem;
            margin-top: 1.5rem;
            margin-bottom: 0.5rem;
            color: var(--gray-color);
        }
        .article-body p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .article-body strong {
            color: var(--dark-color);
            font-weight: 700;
        }
        .article-body em {
            color: var(--gray-color);
        }
        .article-body blockquote {
            border-left: 4px solid var(--secondary-color);
            padding-left: 20px;
            margin: 2rem 0;
            font-style: italic;
            color: var(--dark-color);
            background-color: #f8f9fa;
            padding: 20px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .article-body img {
            margin: 2rem auto;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            max-width: 80%;
        }
        .link-list {
            background: #f1f8ff;
            padding: 20px;
            border-radius: var(--border-radius);
            margin: 2rem 0;
        }
        .link-list h3 {
            border-left: none;
            padding-left: 0;
            color: var(--primary-color);
        }
        .link-list ul {
            list-style-type: none;
            padding-left: 0;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 10px;
        }
        .link-list li {
            padding: 8px 0;
            border-bottom: 1px dashed #ccc;
        }
        .link-list a {
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }
        .link-list a:hover {
            color: var(--secondary-color);
            transform: translateX(5px);
        }
        .link-list i {
            margin-right: 10px;
            color: var(--secondary-color);
        }
        .last-updated {
            font-size: 0.9rem;
            color: var(--gray-color);
            text-align: right;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px solid #eee;
        }
        .last-updated i {
            margin-right: 8px;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .widget {
            background: #fff;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.3rem;
            margin-bottom: 1.2rem;
            color: var(--dark-color);
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light-color);
        }
        .search-form {
            display: flex;
        }
        .search-input {
            flex: 1;
            padding: 12px 15px;
            border: 2px solid #ddd;
            border-right: none;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }
        .search-input:focus {
            border-color: var(--primary-color);
        }
        .search-btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-btn:hover {
            background: #3a5a8a;
        }
        .rating-widget {
            text-align: center;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 5px;
            margin: 15px 0;
            font-size: 1.8rem;
            color: #ffd700;
            cursor: pointer;
        }
        .star {
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            transform: scale(1.2);
            color: #ff9900;
        }
        .rating-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .rating-form select,
        .rating-form textarea {
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-family: inherit;
        }
        .rating-form textarea {
            resize: vertical;
            min-height: 80px;
        }
        .comment-list {
            max-height: 400px;
            overflow-y: auto;
            padding-right: 10px;
        }
        .comment {
            padding: 15px 0;
            border-bottom: 1px solid #eee;
        }
        .comment:last-child {
            border-bottom: none;
        }
        .comment-author {
            font-weight: bold;
            color: var(--primary-color);
        }
        .comment-date {
            font-size: 0.8rem;
            color: var(--gray-color);
            margin-left: 10px;
        }
        .comment-text {
            margin-top: 8px;
        }
        .comment-form {
            display: flex;
            flex-direction: column;
            gap: 15px;
            margin-top: 20px;
        }
        .comment-form input,
        .comment-form textarea {
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: var(--border-radius);
            font-family: inherit;
        }
        .comment-form textarea {
            resize: vertical;
            min-height: 100px;
        }
        footer {
            background-color: var(--dark-color);
            color: var(--text-light);
            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: 15px;
        }
        .footer-logo span {
            color: var(--secondary-color);
        }
        .footer-links h3,
        .footer-contact h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: var(--light-color);
            position: relative;
            padding-bottom: 10px;
        }
        .footer-links h3::after,
        .footer-contact h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--secondary-color);
        }
        .footer-links ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #ccc;
            display: inline-block;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            transform: translateX(5px);
        }
        .friend-links {
            background: rgba(255,255,255,0.05);
            padding: 20px;
            border-radius: var(--border-radius);
            margin-top: 20px;
        }
        .friend-links h4 {
            margin-bottom: 15px;
            color: var(--secondary-color);
        }
        friend-link {
            display: inline-block;
            margin-right: 15px;
            margin-bottom: 10px;
            color: #ccc;
        }
        friend-link a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
            .sidebar {
                order: -1;
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-height: 70px;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .article-body {
                padding: 25px;
            }
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .nav-mobile {
                display: flex;
            }
        }
        @media (max-width: 576px) {
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .article-body h2 {
                font-size: 1.5rem;
            }
            .article-body h3 {
                font-size: 1.3rem;
            }
            .link-list ul {
                grid-template-columns: 1fr;
            }
        }