* { margin: 0; padding: 0; box-sizing: border-box; }
        :root {
            --primary: #1a237e; 
            --secondary: #ff5722; 
            --accent: #4caf50; 
            --light: #f5f5f5;
            --dark: #212121;
            --text: #333;
            --gray: #757575;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text);
            background: #fff;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--secondary); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { padding-left: 1.5rem; margin: 1rem 0; }
        li { margin-bottom: 0.5rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--primary);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-transform: uppercase;
            letter-spacing: 2px;
            display: flex;
            align-items: center;
        }
        .my-logo span:first-child { color: var(--secondary); }
        .my-logo span:last-child { color: #ffeb3b; }
        .my-logo:hover { color: white; }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0;
            position: relative;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--secondary);
            transition: width 0.3s;
        }
        .main-nav a:hover::after,
        .main-nav a.active::after { width: 100%; }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
            background: transparent;
            border: none;
            padding: 5px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background: white;
            border-radius: 2px;
            transition: var(--transition);
        }
        .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .hamburger.active span:nth-child(2) { opacity: 0; }
        .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(7px, -6px); }
        .breadcrumb {
            background: #f0f0f0;
            padding: 0.8rem 20px;
            font-size: 0.9rem;
            border-bottom: 1px solid #ddd;
        }
        .breadcrumb a { color: var(--gray); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb span { color: var(--gray); margin: 0 5px; }
        main { padding: 2rem 0; }
        .article-header { margin-bottom: 2.5rem; text-align: center; }
        .article-header h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .meta-info {
            color: var(--gray);
            font-size: 0.95rem;
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        .update-time { color: var(--accent); font-weight: 600; }
        .content-section {
            margin-bottom: 3rem;
            padding-bottom: 2rem;
            border-bottom: 1px dashed #ddd;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary);
            margin: 2rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--secondary);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--dark);
            margin: 1.8rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--gray);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .highlight {
            background: #fff8e1;
            border-left: 4px solid #ffc107;
            padding: 1.2rem;
            margin: 1.5rem 0;
            border-radius: 0 4px 4px 0;
        }
        .quote {
            font-style: italic;
            color: #555;
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            margin: 1.5rem 0;
        }
        .feature-img {
            margin: 2rem auto;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--shadow);
            max-width: 800px;
        }
        .feature-img figcaption {
            text-align: center;
            font-size: 0.9rem;
            color: var(--gray);
            padding: 0.5rem;
            background: #f9f9f9;
        }
        .btn {
            display: inline-block;
            background: var(--secondary);
            color: white;
            padding: 0.7rem 1.5rem;
            border-radius: 4px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn:hover {
            background: #e64a19;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(255,87,34,0.3);
        }
        .search-box, .comment-form, .rating-form {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 8px;
            margin: 2.5rem 0;
            box-shadow: var(--shadow);
        }
        .form-group { margin-bottom: 1.2rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 4px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary);
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ffc107;
            margin: 0.5rem 0;
            cursor: pointer;
        }
        .stars i { transition: transform 0.2s; }
        .stars i:hover { transform: scale(1.2); }
        .related-links {
            background: #e3f2fd;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        .related-links h3 { margin-top: 0; }
        .related-links ul { list-style: none; padding-left: 0; }
        .related-links li { margin-bottom: 0.8rem; }
        .related-links a { font-weight: 600; }
        footer {
            background: var(--dark);
            color: #ddd;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: white;
            margin-bottom: 1.2rem;
            font-size: 1.3rem;
        }
        .footer-links { list-style: none; padding-left: 0; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #bbb; }
        .footer-links a:hover { color: white; }
        friend-link {
            display: block;
            background: #333;
            padding: 1rem;
            border-radius: 4px;
            margin: 0.5rem 0;
            border-left: 3px solid var(--secondary);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .article-header h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
        }
        @media (max-width: 768px) {
            .header-content { flex-wrap: wrap; }
            .hamburger { display: flex; }
            .main-nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
            }
            .main-nav.active {
                max-height: 300px;
                margin-top: 1rem;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li { width: 100%; }
            .main-nav a {
                display: block;
                padding: 0.8rem 0;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .article-header h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .meta-info { flex-direction: column; gap: 0.5rem; align-items: center; }
        }
        @media (max-width: 480px) {
            .container { padding: 0 15px; }
            .article-header h1 { font-size: 1.7rem; }
            .my-logo { font-size: 1.8rem; }
            .search-box, .comment-form, .rating-form { padding: 1.5rem; }
        }