:root {
            --primary: #4a6fa5;
            --secondary: #ff7b54;
            --accent: #6bc46b;
            --light: #f8f9fa;
            --dark: #343a40;
            --gray: #6c757d;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --radius: 8px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul, ol { list-style-position: inside; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
        .site-header {
            background: linear-gradient(135deg, var(--primary), #2c5282);
            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;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i { color: var(--accent); }
        .my-logo span { text-shadow: 2px 2px 4px rgba(0,0,0,0.3); }
        .breadcrumb {
            background-color: var(--light);
            padding: 0.8rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #dee2e6;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: var(--gray);
        }
        .breadcrumb a:hover { color: var(--secondary); }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.8rem;
        }
        .nav-links a {
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-links a:hover,
        .nav-links a:focus {
            color: var(--accent);
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--accent);
            transition: width 0.3s ease;
        }
        .nav-links a:hover::after { width: 100%; }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .mobile-search { display: none; }
        .search-box {
            margin: 2rem auto;
            max-width: 700px;
            padding: 1.5rem;
            background: var(--light);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .search-box h2 {
            margin-bottom: 1rem;
            color: var(--primary);
            text-align: center;
        }
        .search-form {
            display: flex;
        }
        .search-input {
            flex-grow: 1;
            padding: 15px;
            border: 2px solid #ccc;
            border-radius: var(--radius) 0 0 var(--radius);
            font-size: 1rem;
        }
        .search-btn {
            background-color: var(--secondary);
            color: white;
            border: none;
            padding: 0 25px;
            border-radius: 0 var(--radius) var(--radius) 0;
            cursor: pointer;
            font-size: 1.1rem;
        }
        .search-btn:hover { background-color: #e06a3e; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 30px 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        article { line-height: 1.8; }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 2px dashed var(--accent);
            color: var(--gray);
            font-size: 0.95rem;
        }
        .update-time { color: var(--secondary); font-weight: 600; }
        h1 {
            font-size: 2.8rem;
            color: var(--primary);
            margin: 1.5rem 0;
            line-height: 1.3;
        }
        h2 {
            font-size: 2rem;
            color: var(--dark);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--primary);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--secondary);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--accent);
            margin: 1.5rem 0 0.8rem;
        }
        .intro {
            font-size: 1.3rem;
            color: var(--gray);
            margin-bottom: 2.5rem;
            padding: 1.5rem;
            background-color: #f0f8ff;
            border-left: 5px solid var(--primary);
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        p { margin-bottom: 1.5rem; text-align: justify; }
        strong { color: var(--primary); }
        em { color: var(--secondary); }
        blockquote {
            margin: 2rem 0;
            padding: 1.5rem 2rem;
            background: linear-gradient(to right, #f8f9fa, #e9ecef);
            border-left: 5px solid var(--accent);
            font-style: italic;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .highlight-box {
            background-color: #fff9e6;
            border: 1px solid #ffd166;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: var(--radius);
        }
        .content-img {
            margin: 2.5rem auto;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            max-width: 800px;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            padding: 0.8rem;
            background-color: var(--light);
        }
        .feature-list, .step-list { padding-left: 1.5rem; margin-bottom: 1.5rem; }
        .feature-list li, .step-list li { margin-bottom: 0.8rem; }
        .sidebar {
            background-color: var(--light);
            padding: 1.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar-widget { margin-bottom: 2.5rem; }
        .sidebar-widget h3 {
            font-size: 1.4rem;
            margin-bottom: 1rem;
            color: var(--primary);
            padding-bottom: 0.5rem;
            border-bottom: 1px solid #ccc;
        }
        .related-links a {
            display: block;
            padding: 0.8rem;
            margin-bottom: 0.7rem;
            background-color: white;
            border-radius: var(--radius);
            border-left: 4px solid var(--accent);
            transition: var(--transition);
        }
        .related-links a:hover {
            background-color: #e3f2fd;
            transform: translateX(5px);
        }
        .quick-nav { line-height: 2.2; }
        .quick-nav a {
            display: block;
            padding-left: 1rem;
            position: relative;
        }
        .quick-nav a::before {
            content: '▶';
            position: absolute;
            left: 0;
            color: var(--accent);
            font-size: 0.8rem;
        }
        .interaction-section {
            margin: 3rem 0;
            padding: 2rem;
            background-color: #f8f9fa;
            border-radius: var(--radius);
        }
        .interaction-section h2 { border-bottom: none; text-align: center; }
        .rating-widget {
            text-align: center;
            margin: 2rem 0;
        }
        .stars {
            font-size: 2.5rem;
            color: #ddd;
            margin: 1rem 0;
            cursor: pointer;
        }
        .stars .star { margin: 0 3px; }
        .stars .star.active, .stars .star:hover { color: #ffc107; }
        .comment-form, .rating-form {
            max-width: 800px;
            margin: 2rem auto;
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
        }
        .form-group { display: flex; flex-direction: column; }
        .form-group label { margin-bottom: 0.5rem; font-weight: 600; color: var(--dark); }
        .form-input, .form-textarea {
            padding: 15px;
            border: 1px solid #ced4da;
            border-radius: var(--radius);
            font-size: 1rem;
            font-family: inherit;
        }
        .form-textarea { min-height: 150px; resize: vertical; }
        .form-submit {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 15px;
            border-radius: var(--radius);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .form-submit:hover { background-color: #3a5985; }
        .site-footer {
            background-color: var(--dark);
            color: #adb5bd;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            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: 1.4rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid #495057;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        .friend-links a {
            background-color: #495057;
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
        }
        .friend-links a:hover {
            background-color: var(--accent);
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #495057;
            font-size: 0.9rem;
            color: #6c757d;
        }
        @media (max-width: 768px) {
            .header-content { flex-wrap: wrap; }
            .hamburger { display: block; }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: var(--primary);
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem;
                box-shadow: var(--shadow);
                z-index: 999;
            }
            .nav-links.active { display: flex; }
            .nav-links li { margin: 0.5rem 0; }
            .mobile-search { display: block; margin-top: 1rem; width: 100%; }
            .mobile-search .search-input { width: 100%; border-radius: var(--radius); }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .intro { font-size: 1.1rem; padding: 1rem; }
            .search-form { flex-direction: column; }
            .search-input, .search-btn { border-radius: var(--radius); width: 100%; }
            .search-btn { margin-top: 10px; padding: 15px; }
        }