* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { text-decoration: none; color: #2a5ba0; transition: color 0.3s; }
        a:hover { color: #1d3d6f; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        h1, h2, h3, h4 { color: #1a365d; margin-bottom: 1rem; font-weight: 700; line-height: 1.2; }
        h1 { font-size: 3.2rem; margin-top: 1.5rem; }
        h2 { font-size: 2.5rem; border-left: 5px solid #2a5ba0; padding-left: 15px; margin-top: 2.5rem; }
        h3 { font-size: 1.8rem; margin-top: 2rem; }
        h4 { font-size: 1.4rem; margin-top: 1.5rem; }
        p { margin-bottom: 1.5rem; font-size: 1.125rem; }
        .lead { font-size: 1.3rem; font-weight: 300; color: #4a5568; }
        .highlight { background-color: #e6f7ff; padding: 2px 6px; border-radius: 3px; }
        .bold { font-weight: 700; color: #1a365d; }
        .emoji { font-size: 1.2em; }
        .site-header { background: #1a365d; color: white; padding: 1rem 0; position: sticky; top: 0; z-index: 1000; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
        .header-container { display: flex; justify-content: space-between; align-items: center; }
        .my-logo { font-family: 'Georgia', serif; font-size: 2.2rem; font-weight: bold; color: #63b3ed; }
        .my-logo:hover { color: #90cdf4; }
        .main-nav ul { display: flex; list-style: none; }
        .main-nav li { margin-left: 2rem; }
        .main-nav a { color: white; font-weight: 500; padding: 0.5rem 0; position: relative; }
        .main-nav a:after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: #63b3ed; 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 { padding: 1rem 0; font-size: 0.95rem; color: #718096; }
        .breadcrumb a { color: #4a5568; }
        .breadcrumb a:hover { text-decoration: underline; }
        .search-box { background: white; padding: 2rem; border-radius: 10px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); margin: 2rem 0; }
        .search-form { display: flex; }
        .search-input { flex: 1; padding: 15px; border: 2px solid #cbd5e0; border-radius: 8px 0 0 8px; font-size: 1.1rem; }
        .search-btn { background: #2a5ba0; color: white; border: none; padding: 0 25px; border-radius: 0 8px 8px 0; cursor: pointer; font-size: 1.1rem; transition: background 0.3s; }
        .search-btn:hover { background: #1d3d6f; }
        .main-content { display: grid; grid-template-columns: 1fr 300px; gap: 40px; margin: 2rem 0; }
        .article-content { background: white; padding: 2.5rem; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.06); }
        .sidebar { background: white; padding: 1.5rem; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.06); align-self: start; }
        .widget { margin-bottom: 2rem; }
        .widget-title { font-size: 1.3rem; border-bottom: 2px solid #e2e8f0; padding-bottom: 0.5rem; margin-bottom: 1rem; }
        .rating-widget, .comment-widget { background: #f8fafc; padding: 1.5rem; border-radius: 10px; border: 1px solid #e2e8f0; }
        .stars { color: #f6ad55; font-size: 1.8rem; margin: 0.5rem 0; }
        .rate-btn, .comment-submit { background: #2a5ba0; color: white; border: none; padding: 12px 20px; border-radius: 8px; cursor: pointer; width: 100%; font-size: 1rem; margin-top: 1rem; transition: background 0.3s; }
        .rate-btn:hover, .comment-submit:hover { background: #1d3d6f; }
        textarea, .score-select { width: 100%; padding: 12px; border: 1px solid #cbd5e0; border-radius: 8px; font-family: inherit; font-size: 1rem; margin-top: 0.5rem; }
        .site-footer { background: #1a365d; color: #cbd5e0; padding: 3rem 0 1.5rem; margin-top: 3rem; }
        .footer-container { display: flex; flex-wrap: wrap; justify-content: space-between; }
        .footer-section { flex: 1; min-width: 250px; margin-bottom: 2rem; }
        .footer-section h3 { color: #90cdf4; border-left: none; padding-left: 0; }
        friend-link { display: block; margin-bottom: 0.5rem; }
        friend-link a { color: #cbd5e0; }
        friend-link a:hover { color: white; }
        .copyright { text-align: center; padding-top: 2rem; border-top: 1px solid #2d3748; width: 100%; font-size: 0.9rem; color: #a0aec0; }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
            h1 { font-size: 2.8rem; }
            h2 { font-size: 2.2rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav ul { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; width: 100%; background: #1a365d; padding: 1rem; box-shadow: 0 10px 15px rgba(0,0,0,0.1); }
            .main-nav.active ul { display: flex; }
            .main-nav li { margin: 0.8rem 0; margin-left: 0; }
            .header-container { flex-wrap: wrap; }
            .article-content { padding: 1.5rem; }
        }
        .hover-card { transition: transform 0.3s, box-shadow 0.3s; }
        .hover-card:hover { transform: translateY(-5px); box-shadow: 0 15px 35px rgba(0,0,0,0.1); }
        .img-container { margin: 2rem 0; border-radius: 10px; overflow: hidden; }
        .toc { background: #f0f9ff; padding: 1.5rem; border-radius: 10px; margin: 2rem 0; }
        .toc ul { list-style: none; padding-left: 1rem; }
        .toc li { margin-bottom: 0.8rem; }
        .update-time { font-style: italic; color: #718096; background: #f7fafc; padding: 0.5rem; border-radius: 5px; display: inline-block; margin-bottom: 1.5rem; }