:root {
            --primary-color: #1a365d;
            --secondary-color: #c53030;
            --accent-color: #ecc94b;
            --text-dark: #2d3748;
            --text-light: #f7fafc;
            --bg-light: #f8f9fa;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
            --border-radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        ul {
            list-style: none;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .btn {
            display: inline-block;
            padding: 12px 24px;
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: #9b2c2c;
            transform: translateY(-2px);
        }
        header {
            background-color: var(--primary-color);
            color: var(--text-light);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            padding: 15px 0;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-color);
            letter-spacing: 1px;
        }
        .my-logo span {
            color: white;
        }
        .search-box {
            display: flex;
            max-width: 400px;
            width: 100%;
        }
        .search-box input {
            flex: 1;
            padding: 10px 15px;
            border: none;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
        }
        .search-box button {
            padding: 0 20px;
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            background: none;
            border: none;
            color: white;
        }
        nav {
            background-color: rgba(26, 54, 93, 0.95);
        }
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
        }
        .main-nav {
            display: flex;
        }
        .main-nav li {
            position: relative;
        }
        .main-nav > li > a {
            display: block;
            padding: 18px 20px;
            font-weight: 600;
            border-bottom: 3px solid transparent;
        }
        .main-nav > li > a:hover,
        .main-nav > li > a.active {
            background-color: rgba(255,255,255,0.05);
            border-bottom-color: var(--accent-color);
        }
        .dropdown {
            position: absolute;
            top: 100%;
            left: 0;
            background-color: white;
            color: var(--text-dark);
            min-width: 220px;
            box-shadow: var(--shadow);
            border-radius: var(--border-radius);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: var(--transition);
            z-index: 100;
        }
        .main-nav li:hover .dropdown {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .dropdown a {
            display: block;
            padding: 12px 20px;
            border-bottom: 1px solid #eee;
        }
        .dropdown a:hover {
            background-color: #f5f5f5;
            color: var(--secondary-color);
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: #edf2f7;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: ">";
            margin: 0 10px;
            color: #718096;
        }
        .breadcrumb a:hover {
            color: var(--secondary-color);
        }
        main {
            padding: 40px 0;
        }
        .article-header {
            margin-bottom: 40px;
            text-align: center;
        }
        .article-header h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
            color: #718096;
            font-size: 0.95rem;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        article {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }
        article h2, article h3, article h4 {
            color: var(--primary-color);
            margin-top: 2em;
            margin-bottom: 0.8em;
            line-height: 1.3;
        }
        article h2 {
            font-size: 2.2rem;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 10px;
        }
        article h3 {
            font-size: 1.8rem;
        }
        article h4 {
            font-size: 1.4rem;
        }
        article p {
            margin-bottom: 1.5em;
            text-align: justify;
            font-size: 1.1rem;
        }
        article strong {
            color: var(--secondary-color);
            font-weight: 700;
        }
        article em {
            background-color: #fffacd;
            font-style: italic;
            padding: 0 3px;
        }
        .highlight-box {
            background-color: #f0f8ff;
            border-left: 4px solid var(--primary-color);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .feature-img {
            width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            margin: 30px 0;
            box-shadow: var(--shadow);
        }
        .internal-links {
            background-color: #f7fafc;
            padding: 25px;
            border-radius: var(--border-radius);
            margin: 30px 0;
        }
        .internal-links h4 {
            margin-top: 0;
            color: var(--secondary-color);
        }
        .internal-links ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 10px;
        }
        .internal-links li {
            padding: 8px 0;
            border-bottom: 1px dotted #cbd5e0;
        }
        .internal-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        aside {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 25px;
            box-shadow: var(--shadow);
        }
        .sidebar-widget h3 {
            font-size: 1.3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-color);
        }
        .rating-widget .stars {
            display: flex;
            justify-content: center;
            margin-bottom: 20px;
            font-size: 2rem;
            color: #ecc94b;
        }
        .rating-form input, .comment-form input, .comment-form textarea {
            width: 100%;
            padding: 12px;
            margin-bottom: 15px;
            border: 1px solid #cbd5e0;
            border-radius: var(--border-radius);
            font-size: 1rem;
        }
        .comment-form textarea {
            min-height: 150px;
            resize: vertical;
        }
        footer {
            background-color: var(--primary-color);
            color: var(--text-light);
            padding: 50px 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-widget h4 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: var(--accent-color);
        }
        .footer-widget a {
            display: block;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255,255,255,0.05);
        }
        .footer-widget a:hover {
            color: var(--accent-color);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            padding: 10px 15px;
            background-color: rgba(255,255,255,0.05);
            margin-bottom: 10px;
            border-radius: 4px;
        }
        friend-link:hover {
            background-color: rgba(255,255,255,0.1);
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .search-box {
                order: 3;
                margin-top: 15px;
                max-width: 100%;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--primary-color);
                flex-direction: column;
                align-items: stretch;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
                box-shadow: var(--shadow);
            }
            .main-nav.active {
                max-height: 500px;
            }
            .main-nav > li > a {
                padding: 15px 20px;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .dropdown {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                background-color: rgba(0,0,0,0.2);
                box-shadow: none;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.3s ease;
            }
            .dropdown.active {
                max-height: 300px;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            article {
                padding: 25px;
            }
        }