:root {
            --primary: #2ecc71;
            --primary-dark: #27ae60;
            --secondary: #3498db;
            --dark: #2c3e50;
            --light: #ecf0f1;
            --gray: #95a5a6;
            --danger: #e74c3c;
            --warning: #f39c12;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f9f9f9;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: var(--secondary);
            transition: color 0.3s ease;
        }
        a:hover {
            color: var(--primary-dark);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--dark);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover {
            color: white;
        }
        .my-logo i {
            font-size: 1.8rem;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 8px 0;
            position: relative;
        }
        .main-nav a:hover {
            color: var(--primary);
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--primary);
            transition: width 0.3s;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: var(--light);
            padding: 12px 0;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--dark);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .separator {
            margin: 0 8px;
            color: var(--gray);
        }
        .search-section {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            padding: 40px 0;
            text-align: center;
            color: white;
        }
        .search-box {
            max-width: 600px;
            margin: 20px auto 0;
        }
        .search-form {
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .search-input {
            flex: 1;
            padding: 18px 25px;
            border: none;
            font-size: 1.1rem;
        }
        .search-btn {
            background: var(--dark);
            color: white;
            border: none;
            padding: 0 30px;
            cursor: pointer;
            font-size: 1.2rem;
            transition: background 0.3s;
        }
        .search-btn:hover {
            background: #1a252f;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-body {
            background: white;
            padding: 40px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 1px solid #eee;
            color: var(--gray);
            font-size: 0.9rem;
        }
        .update-time {
            color: var(--danger);
            font-weight: 600;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--dark);
            margin-bottom: 25px;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-dark);
            margin: 45px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--light);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--secondary);
            margin: 35px 0 15px;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--dark);
            margin: 25px 0 10px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            color: var(--dark);
            font-weight: 500;
            margin-bottom: 30px;
            padding: 20px;
            background: #f8f9fa;
            border-left: 5px solid var(--primary);
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .highlight {
            background: linear-gradient(120deg, #a8edea 0%, #fed6e3 100%);
            padding: 25px;
            border-radius: var(--radius);
            margin: 30px 0;
            border-left: 5px solid var(--warning);
        }
        .feature-img {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: var(--radius);
            margin: 30px auto;
            display: block;
            box-shadow: var(--shadow);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: -20px;
            margin-bottom: 30px;
        }
        ul, ol {
            margin-left: 30px;
            margin-bottom: 25px;
        }
        li {
            margin-bottom: 10px;
        }
        strong {
            color: var(--dark);
            font-weight: 700;
        }
        em {
            color: var(--secondary);
            font-style: italic;
        }
        .keyword-link {
            font-weight: 600;
            color: var(--primary-dark);
            border-bottom: 1px dashed var(--primary);
        }
        .keyword-link:hover {
            border-bottom-style: solid;
        }
        .side-panel {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .widget {
            background: white;
            padding: 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .widget h3 {
            font-size: 1.4rem;
            margin-top: 0;
            color: var(--dark);
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        .related-links li {
            margin-bottom: 12px;
            padding-left: 10px;
            border-left: 3px solid transparent;
            transition: all 0.3s;
        }
        .related-links li:hover {
            border-left-color: var(--primary);
            padding-left: 15px;
        }
        .rating-widget {
            text-align: center;
        }
        .stars {
            font-size: 2rem;
            color: var(--gray);
            margin: 15px 0;
            cursor: pointer;
        }
        .stars i {
            margin: 0 3px;
            transition: color 0.2s;
        }
        .stars i:hover,
        .stars i.active {
            color: var(--warning);
        }
        .comment-form textarea {
            width: 100%;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            margin-bottom: 15px;
            resize: vertical;
            min-height: 120px;
            font-size: 1rem;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: var(--radius);
            font-size: 1rem;
        }
        .submit-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: var(--radius);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
            width: 100%;
        }
        .submit-btn:hover {
            background: var(--primary-dark);
        }
        .site-footer {
            background: var(--dark);
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }
        @media (max-width: 768px) {
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        .footer-col h4 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 25px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary);
        }
        .footer-links li {
            list-style: none;
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #bbb;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255,255,255,0.1);
            padding: 15px;
            border-radius: var(--radius);
            margin-bottom: 15px;
            transition: transform 0.3s;
        }
        friend-link:hover {
            transform: translateX(10px);
            background: rgba(46, 204, 113, 0.2);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #bbb;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav ul {
                position: fixed;
                top: 80px;
                right: -100%;
                flex-direction: column;
                background: var(--dark);
                width: 250px;
                height: calc(100vh - 80px);
                padding: 40px 30px;
                transition: right 0.5s;
                box-shadow: -5px 0 15px rgba(0,0,0,0.2);
            }
            .main-nav.active ul {
                right: 0;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .article-body {
                padding: 25px;
            }
            .header-container, .breadcrumb {
                padding-left: 15px;
                padding-right: 15px;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .article-body {
            animation: fadeIn 0.8s ease-out;
        }
        .text-center {
            text-align: center;
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 3px;
        }
        .divider {
            height: 1px;
            background: linear-gradient(to right, transparent, var(--gray), transparent);
            margin: 40px 0;
        }