:root {
            --primary-green: #6aaa64;
            --secondary-yellow: #c9b458;
            --dark-gray: #3a3a3c;
            --light-gray: #d3d6da;
            --bg-white: #ffffff;
            --text-primary: #1a1a1b;
            --text-secondary: #787c7e;
            --accent-blue: #3498db;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 2rem;
            --spacing-lg: 4rem;
            --border-radius: 8px;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --max-width: 1200px;
            font-size: 16px;
        }
        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-white);
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--spacing-sm);
        }
        .site-header {
            background-color: var(--bg-white);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: var(--spacing-sm) 0;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary-green);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo span {
            background-color: var(--primary-green);
            color: white;
            padding: 2px 10px;
            border-radius: var(--border-radius);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: var(--spacing-md);
        }
        .main-nav a {
            text-decoration: none;
            color: var(--dark-gray);
            font-weight: 600;
            padding: var(--spacing-xs) var(--spacing-sm);
            border-radius: var(--border-radius);
            transition: all 0.3s ease;
        }
        .main-nav a:hover, .main-nav a:focus {
            background-color: var(--primary-green);
            color: white;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--dark-gray);
            cursor: pointer;
            padding: var(--spacing-xs);
        }
        .breadcrumb {
            background-color: #f8f9fa;
            padding: var(--spacing-sm) 0;
            margin-bottom: var(--spacing-md);
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--text-secondary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
            color: var(--primary-green);
        }
        .hero {
            background: linear-gradient(135deg, #f0f9f0 0%, #e6f4e6 100%);
            padding: var(--spacing-lg) 0;
            text-align: center;
            margin-bottom: var(--spacing-lg);
            border-bottom: 4px solid var(--primary-green);
        }
        h1 {
            font-size: clamp(2.5rem, 5vw, 3.8rem);
            color: var(--dark-gray);
            margin-bottom: var(--spacing-sm);
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.3rem;
            color: var(--text-secondary);
            max-width: 800px;
            margin: 0 auto var(--spacing-md);
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary-green);
            margin: var(--spacing-lg) 0 var(--spacing-sm);
            padding-bottom: 0.5rem;
            border-bottom: 3px solid var(--light-gray);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--dark-gray);
            margin: var(--spacing-md) 0 var(--spacing-xs);
        }
        h4 {
            font-size: 1.4rem;
            color: var(--secondary-yellow);
            margin: var(--spacing-sm) 0 var(--spacing-xs);
        }
        .content-section {
            margin-bottom: var(--spacing-lg);
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
            hyphens: auto;
        }
        .article-img {
            width: 100%;
            max-width: 900px;
            height: auto;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: var(--spacing-md) auto;
            display: block;
            transition: transform 0.5s ease;
        }
        .article-img:hover {
            transform: scale(1.01);
        }
        .highlight {
            background-color: #fff9e6;
            border-left: 5px solid var(--secondary-yellow);
            padding: var(--spacing-md);
            margin: var(--spacing-md) 0;
            font-style: italic;
        }
        .feature-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: var(--spacing-md);
            margin: var(--spacing-lg) 0;
        }
        .feature-card {
            background: var(--bg-white);
            border: 1px solid var(--light-gray);
            border-radius: var(--border-radius);
            padding: var(--spacing-md);
            box-shadow: var(--shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .feature-card i {
            font-size: 2.5rem;
            color: var(--primary-green);
            margin-bottom: var(--spacing-sm);
        }
        .interactive-module {
            background-color: #f8f9fa;
            border-radius: var(--border-radius);
            padding: var(--spacing-md);
            margin: var(--spacing-lg) 0;
            border: 1px dashed var(--accent-blue);
        }
        .module-title {
            color: var(--accent-blue);
            margin-bottom: var(--spacing-sm);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
            max-width: 600px;
            margin-top: var(--spacing-sm);
        }
        input, textarea, select {
            padding: 12px;
            border: 1px solid var(--light-gray);
            border-radius: var(--border-radius);
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary-green);
        }
        button, .btn {
            background-color: var(--primary-green);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: background-color 0.3s, transform 0.2s;
            display: inline-block;
            text-align: center;
            text-decoration: none;
        }
        button:hover, .btn:hover {
            background-color: #5a9954;
            transform: translateY(-2px);
        }
        .rating {
            display: flex;
            gap: 5px;
            margin: 10px 0;
            font-size: 1.8rem;
            color: var(--secondary-yellow);
            cursor: pointer;
        }
        .star:hover,
        .star:hover ~ .star {
            color: gold;
        }
        .related-links {
            margin: var(--spacing-lg) 0;
            padding: var(--spacing-md);
            background-color: #f0f9f0;
            border-radius: var(--border-radius);
        }
        .related-links h3 {
            color: var(--primary-green);
            margin-bottom: var(--spacing-sm);
        }
        .links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: var(--spacing-sm);
            list-style: none;
        }
        .links-grid a {
            display: block;
            padding: 12px;
            background-color: white;
            border: 1px solid var(--light-gray);
            border-radius: var(--border-radius);
            text-decoration: none;
            color: var(--dark-gray);
            transition: all 0.3s;
            font-weight: 500;
        }
        .links-grid a:hover {
            background-color: var(--primary-green);
            color: white;
            transform: translateX(5px);
        }
        .site-footer {
            background-color: var(--dark-gray);
            color: white;
            padding: var(--spacing-lg) 0;
            margin-top: var(--spacing-lg);
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: var(--spacing-lg);
        }
        .footer-section h4 {
            color: var(--light-gray);
            margin-bottom: var(--spacing-sm);
        }
        .footer-links {
            list-style: none;
        }
        .footer-links a {
            color: #b0b0b0;
            text-decoration: none;
            display: block;
            padding: 5px 0;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: var(--primary-green);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            padding: 10px;
            background-color: #444;
            margin: 5px 0;
            border-radius: 4px;
        }
        friend-link a {
            color: var(--light-gray);
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: var(--spacing-md);
            margin-top: var(--spacing-md);
            border-top: 1px solid #555;
            color: #aaa;
            font-size: 0.9rem;
        }
        .update-time {
            font-size: 0.9rem;
            color: var(--text-secondary);
            text-align: right;
            margin-top: var(--spacing-sm);
            font-style: italic;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: white;
                box-shadow: var(--shadow);
                padding: var(--spacing-sm);
                text-align: center;
            }
            .main-nav.active ul {
                display: flex;
            }
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .header-container, .footer-content {
                flex-direction: column;
                gap: var(--spacing-sm);
            }
            .feature-box {
                grid-template-columns: 1fr;
            }
        }
        @media print {
            .site-header, .interactive-module, .site-footer {
                display: none;
            }
        }