:root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #e74c3c;
            --light-color: #ecf0f1;
            --dark-color: #2c3e50;
            --text-color: #333;
            --text-light: #7f8c8d;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            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 {
            color: var(--secondary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-color);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--border-radius);
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--box-shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: var(--secondary-color);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-links a {
            color: var(--light-color);
            font-weight: 500;
        }
        .nav-links a:hover, .nav-links a.active {
            color: var(--secondary-color);
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: var(--light-color);
            padding: 1rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: ">";
            margin-left: 0.5rem;
            color: var(--text-light);
        }
        main {
            padding: 2rem 0;
            background-color: white;
        }
        .article-header {
            margin-bottom: 3rem;
            text-align: center;
            border-bottom: 2px solid var(--light-color);
            padding-bottom: 2rem;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 2rem;
            color: var(--text-light);
            font-size: 0.95rem;
            flex-wrap: wrap;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        article {
            font-size: 1.1rem;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--secondary-color);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--dark-color);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--dark-color);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--primary-color);
            background-color: #f0f8ff;
            padding: 1.5rem;
            border-left: 4px solid var(--secondary-color);
            border-radius: var(--border-radius);
            margin-bottom: 2.5rem;
        }
        .highlight {
            background-color: #fffacd;
            padding: 1rem;
            border-radius: var(--border-radius);
            border-left: 4px solid #ffd700;
            margin: 1.5rem 0;
        }
        .img-container {
            margin: 2rem 0;
            text-align: center;
        }
        .img-container figcaption {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 0.5rem;
            font-style: italic;
        }
        .timeline {
            position: relative;
            padding: 2rem;
            background-color: #f8f9fa;
            border-radius: var(--border-radius);
            margin: 2.5rem 0;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 50px;
            top: 0;
            bottom: 0;
            width: 4px;
            background-color: var(--secondary-color);
        }
        .timeline-item {
            position: relative;
            padding-left: 100px;
            margin-bottom: 2rem;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: 42px;
            top: 5px;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background-color: var(--accent-color);
            border: 4px solid white;
            box-shadow: 0 0 0 3px var(--secondary-color);
        }
        .timeline-date {
            font-weight: bold;
            color: var(--secondary-color);
        }
        aside {
            background-color: #f8f9fa;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .widget {
            margin-bottom: 2.5rem;
        }
        .widget-title {
            font-size: 1.3rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid #ddd;
        }
        .search-box {
            display: flex;
            margin-bottom: 1.5rem;
        }
        .search-box input {
            flex: 1;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
        }
        .search-box button {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            padding: 0 1.2rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-box button:hover {
            background-color: var(--primary-color);
        }
        .rating-widget form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 5px;
            font-size: 1.8rem;
            color: #ffd700;
            cursor: pointer;
        }
        .stars span:hover,
        .stars span:hover ~ span {
            color: #ffd700;
        }
        .rating-widget button, .comment-form button {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            padding: 0.8rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            transition: var(--transition);
        }
        .rating-widget button:hover, .comment-form button:hover {
            background-color: var(--primary-color);
        }
        .comment-form textarea {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            resize: vertical;
            min-height: 120px;
        }
        .link-list {
            list-style: none;
        }
        .link-list li {
            margin-bottom: 0.8rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .link-list li::before {
            content: '🔗';
            position: absolute;
            left: 0;
        }
        footer {
            background-color: var(--primary-color);
            color: var(--light-color);
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: white;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            font-size: 1rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a6278;
            font-size: 0.9rem;
            color: #bdc3c7;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--primary-color);
                padding: 1rem;
                box-shadow: var(--box-shadow);
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger { display: block; }
            .article-meta { flex-direction: column; gap: 0.5rem; }
            .timeline::before { left: 30px; }
            .timeline-item { padding-left: 70px; }
            .timeline-item::before { left: 22px; }
        }
        .btn {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: 0.7rem 1.5rem;
            border-radius: var(--border-radius);
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        .tag {
            display: inline-block;
            background-color: #e0f7fa;
            color: #006064;
            padding: 0.3rem 0.8rem;
            border-radius: 50px;
            font-size: 0.85rem;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
        blockquote {
            border-left: 4px solid var(--secondary-color);
            padding-left: 1.5rem;
            margin: 2rem 0;
            font-style: italic;
            color: var(--text-light);
        }
        .table-of-contents {
            background-color: #f0f8ff;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            margin-bottom: 2.5rem;
        }
        .table-of-contents ul {
            list-style: none;
            padding-left: 1rem;
        }
        .table-of-contents li {
            margin-bottom: 0.7rem;
        }
        .table-of-contents a {
            color: var(--primary-color);
        }
        .table-of-contents a:hover {
            text-decoration: underline;
        }