* { 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%, #e4e8f0 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        img { max-width: 100%; height: auto; display: block; }
        .site-header {
            background: linear-gradient(90deg, #2c3e50, #4a6491);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            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;
            text-decoration: none;
            color: #fff;
            background: linear-gradient(90deg, #ff7e5f, #feb47b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
            transition: transform 0.3s ease;
        }
        .my-logo:hover { transform: scale(1.05); }
        .main-nav { display: flex; align-items: center; }
        .nav-links {
            display: flex;
            list-style: none;
        }
        .nav-links li { margin-left: 2rem; }
        .nav-links a {
            color: #ecf0f1;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
            transition: all 0.3s ease;
        }
        .nav-links a:hover, .nav-links a.active {
            color: #feb47b;
            border-bottom-color: #feb47b;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background: #ecf0f1;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            color: #7f8c8d;
            margin-bottom: 2rem;
        }
        .breadcrumb a { color: #3498db; text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        main { flex: 1; padding: 2rem 0; }
        article { background: white; border-radius: 12px; padding: 2.5rem; box-shadow: 0 6px 20px rgba(0,0,0,0.08); margin-bottom: 2rem; }
        h1 { font-size: 2.8rem; color: #2c3e50; margin-bottom: 1.5rem; line-height: 1.2; border-left: 6px solid #e74c3c; padding-left: 1rem; }
        h2 { font-size: 2rem; color: #34495e; margin: 2.5rem 0 1.2rem; padding-bottom: 0.5rem; border-bottom: 2px dashed #bdc3c7; }
        h3 { font-size: 1.6rem; color: #16a085; margin: 2rem 0 1rem; }
        h4 { font-size: 1.3rem; color: #8e44ad; margin: 1.5rem 0 0.8rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.2rem; color: #2c3e50; font-weight: 500; background: #f8f9fa; padding: 1.5rem; border-radius: 8px; border-left: 4px solid #3498db; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.4rem; border-radius: 3px; font-weight: 600; }
        strong { color: #c0392b; }
        em { color: #27ae60; }
        .content-img {
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .img-caption { text-align: center; font-style: italic; color: #7f8c8d; margin-top: 0.5rem; font-size: 0.95rem; }
        .related-links {
            background: #e8f4fc;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2rem 0;
            border-left: 5px solid #2980b9;
        }
        .related-links h3 { color: #2980b9; margin-top: 0; }
        .related-links ul { list-style: square inside; }
        .related-links li { margin-bottom: 0.7rem; }
        .related-links a { color: #2c3e50; text-decoration: none; font-weight: 500; }
        .related-links a:hover { text-decoration: underline; color: #e74c3c; }
        .update-time {
            text-align: right;
            font-size: 0.9rem;
            color: #95a5a6;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px solid #ecf0f1;
        }
        .interactive-module {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
        }
        .module-box {
            background: #fff;
            border-radius: 10px;
            padding: 2rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            border-top: 4px solid #3498db;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .module-box:hover { transform: translateY(-5px); box-shadow: 0 10px 25px rgba(0,0,0,0.1); }
        .module-box h3 { margin-top: 0; }
        .module-box form { display: flex; flex-direction: column; }
        .module-box input, .module-box textarea, .module-box select {
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #bdc3c7;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
        }
        .module-box button {
            background: linear-gradient(90deg, #3498db, #2c3e50);
            color: white;
            border: none;
            padding: 0.9rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s ease;
        }
        .module-box button:hover { background: linear-gradient(90deg, #2980b9, #1c2833); }
        .star-rating { display: flex; justify-content: center; gap: 0.5rem; margin: 1rem 0; }
        .star-rating input { display: none; }
        .star-rating label { font-size: 2rem; color: #ddd; cursor: pointer; transition: color 0.2s; }
        .star-rating input:checked ~ label, .star-rating label:hover, .star-rating label:hover ~ label { color: #f39c12; }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 { color: #feb47b; margin-bottom: 1.5rem; font-size: 1.3rem; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 0.8rem; }
        .footer-links a { color: #bdc3c7; text-decoration: none; transition: color 0.3s; }
        .footer-links a:hover { color: #feb47b; }
        friend-link {
            display: inline-block;
            background: #34495e;
            color: #ecf0f1;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            text-decoration: none;
            margin: 0.3rem;
            transition: all 0.3s;
        }
        friend-link:hover { background: #3498db; transform: scale(1.05); }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #34495e;
            font-size: 0.9rem;
            color: #95a5a6;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-links {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 100%;
                flex-direction: column;
                background: #2c3e50;
                padding: 2rem;
                transition: left 0.5s ease;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
            }
            .nav-links.active { left: 0; }
            .nav-links li { margin: 1rem 0; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            article { padding: 1.5rem; }
            .header-content, .footer-content { flex-direction: column; text-align: center; }
        }