:root {
            --primary: #8B4513;
            --secondary: #D2691E;
            --accent: #F4A460;
            --light: #FAEBD7;
            --dark: #5D2906;
            --text: #333333;
            --gray: #888888;
            --white: #FFFFFF;
            --shadow: 0 4px 12px rgba(139, 69, 19, 0.1);
            --radius: 8px;
            --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: 1.8;
            color: var(--text);
            background: linear-gradient(135deg, #FAEBD7 0%, #FFF8F0 100%);
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        header {
            background: var(--white);
            box-shadow: var(--shadow);
            border-radius: 0 0 var(--radius) var(--radius);
            padding: 1rem 2rem;
            margin-bottom: 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--secondary);
            font-size: 2.5rem;
        }
        .logo span {
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 1.5rem;
        }
        .nav-links {
            display: flex;
            gap: 1.8rem;
            list-style: none;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover {
            background: var(--light);
            color: var(--primary);
        }
        .nav-links a:hover::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 50%;
            transform: translateX(-50%);
            width: 30px;
            height: 3px;
            background: var(--secondary);
            border-radius: 2px;
        }
        .search-form {
            display: flex;
            border: 2px solid var(--accent);
            border-radius: 50px;
            overflow: hidden;
            background: var(--white);
        }
        .search-form input {
            border: none;
            padding: 0.7rem 1.2rem;
            width: 200px;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0.7rem 1.5rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: var(--primary);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            color: var(--primary);
            cursor: pointer;
            background: none;
            border: none;
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: var(--gray);
            margin-bottom: 1.5rem;
            border-bottom: 1px solid #eee;
        }
        .breadcrumb a {
            color: var(--secondary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb i {
            margin: 0 8px;
            font-size: 0.8rem;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin-bottom: 3rem;
        }
        @media (max-width: 900px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: var(--white);
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        h1 {
            color: var(--primary);
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.3;
            border-bottom: 3px solid var(--accent);
            padding-bottom: 1rem;
        }
        h2 {
            color: var(--dark);
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-left: 1rem;
            border-left: 5px solid var(--secondary);
        }
        h3 {
            color: var(--secondary);
            font-size: 1.5rem;
            margin: 2rem 0 1rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            color: var(--dark);
            font-weight: 600;
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--radius);
            border-left: 4px solid var(--primary);
            margin-bottom: 2rem;
        }
        .highlight {
            background: linear-gradient(120deg, var(--accent) 0%, transparent 100%);
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .term {
            color: var(--primary);
            font-weight: 700;
            font-style: italic;
        }
        .feature-image {
            width: 100%;
            border-radius: var(--radius);
            margin: 2rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            transition: transform 0.5s ease;
        }
        .feature-image:hover {
            transform: scale(1.01);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.7rem;
        }
        .rule-box {
            background: #f8f4f0;
            border: 2px dashed var(--secondary);
            border-radius: var(--radius);
            padding: 1.8rem;
            margin: 2rem 0;
        }
        .rule-box h3 {
            color: var(--primary);
            margin-top: 0;
        }
        sidebar {
            background: var(--white);
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .toc {
            margin-bottom: 2rem;
        }
        .toc h3 {
            margin-top: 0;
            color: var(--primary);
        }
        .toc ul {
            list-style: none;
            margin-left: 0;
        }
        .toc li {
            margin-bottom: 0.8rem;
            padding-left: 1rem;
            border-left: 3px solid transparent;
            transition: var(--transition);
        }
        .toc li:hover {
            border-left-color: var(--secondary);
            padding-left: 1.5rem;
        }
        .toc a {
            text-decoration: none;
            color: var(--text);
            display: block;
        }
        .toc a:hover {
            color: var(--primary);
        }
        .interactive-section {
            background: var(--light);
            padding: 2rem;
            border-radius: var(--radius);
            margin: 2.5rem 0;
        }
        .rating-box, .comment-box {
            margin-bottom: 2rem;
        }
        .rating-box h3, .comment-box h3 {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 1.5rem;
        }
        .stars {
            display: flex;
            gap: 5px;
            margin-bottom: 1rem;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #FFD700;
        }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .rating-form button, .comment-form button {
            align-self: flex-start;
            background: var(--secondary);
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .rating-form button:hover, .comment-form button:hover {
            background: var(--primary);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(139, 69, 19, 0.2);
        }
        textarea, input[type="text"], input[type="email"] {
            width: 100%;
            padding: 1rem;
            border: 2px solid #eee;
            border-radius: var(--radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        textarea:focus, input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(244, 164, 96, 0.2);
        }
        textarea {
            min-height: 150px;
            resize: vertical;
        }
        .longtail-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 3rem 0;
            padding: 2rem 0;
            border-top: 2px solid var(--accent);
            border-bottom: 2px solid var(--accent);
        }
        .web-link {
            background: var(--white);
            padding: 1.2rem;
            border-radius: var(--radius);
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            transition: var(--transition);
        }
        .web-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(139, 69, 19, 0.1);
        }
        .web-link a {
            text-decoration: none;
            color: var(--primary);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .web-link a:hover {
            color: var(--secondary);
        }
        .web-link i {
            color: var(--secondary);
        }
        footer {
            text-align: center;
            padding: 2.5rem 0;
            color: var(--gray);
            font-size: 0.95rem;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-links a {
            color: var(--secondary);
            text-decoration: none;
        }
        .footer-links a:hover {
            text-decoration: underline;
        }
        .copyright {
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid #eee;
        }
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                align-items: flex-start;
                gap: 1rem;
            }
            nav {
                width: 100%;
                justify-content: space-between;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: var(--white);
                position: absolute;
                top: 100%;
                left: 0;
                box-shadow: var(--shadow);
                border-radius: 0 0 var(--radius) var(--radius);
                padding: 1rem;
                z-index: 1000;
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .search-form input {
                width: 150px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .article-content {
                padding: 1.5rem;
            }
            .longtail-links {
                grid-template-columns: 1fr;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .article-content, sidebar, .interactive-section {
            animation: fadeIn 0.8s ease-out;
        }
        @media print {
            .hamburger, .search-form, .interactive-section, .longtail-links, footer {
                display: none;
            }
            body {
                background: white;
                max-width: 100%;
            }
        }