:root {
            --primary-color: #1a365d;
            --secondary-color: #e53e3e;
            --accent-color: #38a169;
            --light-bg: #f7fafc;
            --dark-text: #2d3748;
            --light-text: #718096;
            --border-color: #e2e8f0;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --transition: all 0.3s ease;
        }
        * {
            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(--dark-text);
            background-color: #fff;
            max-width: 100vw;
            overflow-x: hidden;
        }
        .site-header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            letter-spacing: 1px;
            transition: var(--transition);
        }
        .my-logo:hover {
            color: var(--secondary-color);
            transform: scale(1.05);
        }
        .my-logo span {
            color: var(--secondary-color);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
            transition: var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: var(--secondary-color);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--secondary-color);
            transition: width 0.3s ease;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            background-color: var(--light-bg);
            padding: 1rem 1.5rem;
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb ol {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            list-style: none;
            gap: 0.5rem;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--light-text);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--secondary-color);
            text-decoration: underline;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 0.5rem;
            color: var(--light-text);
        }
        .main-container {
            max-width: 1200px;
            margin: 2rem auto;
            padding: 0 1.5rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        article {
            grid-column: 1 / 2;
        }
        aside {
            grid-column: 2 / 3;
        }
        .article-header {
            margin-bottom: 2.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 3px solid var(--border-color);
        }
        h1 {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            color: var(--light-text);
            font-size: 0.95rem;
        }
        .last-updated {
            background-color: var(--light-bg);
            padding: 0.5rem 1rem;
            border-radius: 5px;
            font-weight: 600;
        }
        .last-updated i {
            margin-right: 0.5rem;
            color: var(--accent-color);
        }
        .featured-image {
            width: 100%;
            margin: 2rem 0;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .featured-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        .featured-image:hover img {
            transform: scale(1.03);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--light-text);
            padding: 0.5rem;
            font-size: 0.9rem;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--border-color);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--dark-text);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: var(--dark-text);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            font-weight: 500;
            color: var(--primary-color);
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-left: 5px solid var(--accent-color);
            border-radius: 0 5px 5px 0;
            margin: 2rem 0;
        }
        .highlight-box {
            background: linear-gradient(135deg, #f0f9ff 0%, #e6f7ff 100%);
            border: 1px solid #bae6fd;
            border-radius: 10px;
            padding: 1.8rem;
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .highlight-box h3 {
            margin-top: 0;
            color: #0369a1;
        }
        .factoid {
            background-color: #fff5f5;
            border-left: 4px solid var(--secondary-color);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            font-style: italic;
        }
        emoji {
            font-size: 1.2em;
            margin-right: 0.5rem;
        }
        strong {
            color: var(--primary-color);
            font-weight: 700;
        }
        a.content-link {
            color: var(--accent-color);
            text-decoration: none;
            font-weight: 600;
            border-bottom: 1px dotted transparent;
            transition: var(--transition);
        }
        a.content-link:hover {
            color: var(--secondary-color);
            border-bottom-color: var(--secondary-color);
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
            box-shadow: var(--shadow);
            border-radius: 10px;
            overflow: hidden;
        }
        .comparison-table th,
        .comparison-table td {
            padding: 1rem;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
        }
        .comparison-table th {
            background-color: var(--primary-color);
            color: white;
            font-weight: 700;
        }
        .comparison-table tr:nth-child(even) {
            background-color: var(--light-bg);
        }
        .comparison-table tr:hover {
            background-color: #edf2f7;
        }
        blockquote {
            border-left: 5px solid var(--accent-color);
            padding: 1.5rem 2rem;
            margin: 2.5rem 0;
            background-color: var(--light-bg);
            font-style: italic;
            border-radius: 0 5px 5px 0;
        }
        blockquote footer {
            margin-top: 1rem;
            font-style: normal;
            font-weight: 600;
            color: var(--light-text);
        }
        aside {
            position: sticky;
            top: 120px;
            align-self: start;
            height: fit-content;
        }
        .sidebar-widget {
            background-color: white;
            border-radius: 10px;
            padding: 1.8rem;
            margin-bottom: 2rem;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
        }
        .sidebar-widget h3 {
            font-size: 1.3rem;
            margin-top: 0;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--border-color);
            color: var(--primary-color);
        }
        .search-form input,
        .comment-form input,
        .comment-form textarea,
        .rating-form select {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-family: inherit;
            transition: var(--transition);
        }
        .search-form input:focus,
        .comment-form input:focus,
        .comment-form textarea:focus,
        .rating-form select:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(56, 161, 105, 0.2);
        }
        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: white;
            padding: 0.8rem 1.5rem;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
            width: 100%;
            text-align: center;
        }
        .btn:hover {
            background-color: #2f855a;
            transform: translateY(-2px);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
        }
        .btn-secondary:hover {
            background-color: #c53030;
        }
        .star-rating {
            display: flex;
            justify-content: space-between;
            margin-bottom: 1rem;
        }
        .star-rating i {
            color: #e2e8f0;
            font-size: 1.8rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating i:hover,
        .star-rating i.active {
            color: #f6ad55;
        }
        .toc {
            background-color: var(--light-bg);
            border-radius: 10px;
            padding: 1.5rem;
        }
        .toc ul {
            list-style: none;
            margin: 0;
        }
        .toc li {
            margin-bottom: 0.8rem;
        }
        .toc a {
            color: var(--dark-text);
            text-decoration: none;
            display: block;
            padding: 0.3rem 0;
            transition: var(--transition);
        }
        .toc a:hover {
            color: var(--accent-color);
            padding-left: 0.5rem;
        }
        .site-footer {
            background-color: var(--primary-color);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-widget h3 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.7rem;
        }
        .footer-widget h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background-color: var(--secondary-color);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #cbd5e0;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 0.5rem;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
        }
        friend-link a {
            color: #90cdf4;
            text-decoration: none;
            font-weight: 600;
        }
        friend-link a:hover {
            color: white;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2d3748;
            color: #a0aec0;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .main-container {
                grid-template-columns: 1fr;
            }
            aside {
                grid-column: 1 / 2;
                position: static;
            }
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 1.9rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .main-nav ul {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 70px);
                background-color: var(--primary-color);
                flex-direction: column;
                align-items: center;
                padding-top: 2rem;
                transition: left 0.5s ease;
                z-index: 999;
            }
            .main-nav.active ul {
                left: 0;
            }
            .hamburger {
                display: block;
            }
            .header-container {
                padding: 0 1rem;
            }
            .main-container,
            .footer-container {
                padding: 0 1rem;
            }
            .featured-image {
                margin: 1.5rem 0;
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .lead {
                font-size: 1.1rem;
                padding: 1rem;
            }
            .sidebar-widget,
            .highlight-box {
                padding: 1.2rem;
            }
        }
        @media print {
            .site-header,
            .breadcrumb,
            aside,
            .site-footer,
            .hamburger {
                display: none;
            }
            .main-container {
                grid-template-columns: 1fr;
                max-width: 100%;
                margin: 0;
                padding: 0;
            }
            article {
                width: 100%;
            }
            h1, h2, h3, h4 {
                page-break-after: avoid;
            }
            p, li {
                page-break-inside: avoid;
            }
        }