* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: #2c3e50;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { color: #3498db; text-decoration: none; transition: color 0.3s ease, transform 0.2s ease; }
        a:hover { color: #2980b9; transform: translateY(-1px); }
        img { max-width: 100%; height: auto; display: block; border-radius: 8px; }
        .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; }
        header { background: linear-gradient(90deg, #1a237e, #4a148c); color: white; box-shadow: 0 4px 12px rgba(0,0,0,0.1); position: sticky; top: 0; z-index: 1000; }
        .header-container { display: flex; justify-content: space-between; align-items: center; padding: 15px 20px; }
        .my-logo { font-family: 'Arial Black', sans-serif; font-size: 2rem; font-weight: 900; color: #00cfbb; text-shadow: 0 2px 4px rgba(0,0,0,0.5); letter-spacing: -0.5px; }
        .my-logo:hover { color: #00ffea; }
        nav { display: flex; align-items: center; }
        .nav-links { display: flex; list-style: none; }
        .nav-links li { margin-left: 2rem; }
        .nav-links a { color: #ecf0f1; font-weight: 600; padding: 8px 12px; border-radius: 4px; }
        .nav-links a:hover { background: rgba(255,255,255,0.15); }
        .hamburger { display: none; background: none; border: none; color: white; font-size: 1.8rem; cursor: pointer; }
        .breadcrumb { padding: 15px 20px; background: #f8f9fa; border-bottom: 1px solid #dee2e6; font-size: 0.9rem; }
        .breadcrumb a { color: #6c757d; }
        .breadcrumb a:hover { color: #495057; }
        .breadcrumb span { color: #adb5bd; }
        main { flex: 1; padding: 30px 0; }
        article { background: white; border-radius: 16px; box-shadow: 0 10px 30px rgba(0,0,0,0.08); padding: 40px; margin-bottom: 40px; }
        h1 { color: #2c3e50; font-size: 2.8rem; margin-bottom: 1.5rem; line-height: 1.2; border-left: 6px solid #3498db; padding-left: 20px; }
        h2 { color: #2c3e50; font-size: 2rem; margin: 2.5rem 0 1.2rem; padding-bottom: 0.5rem; border-bottom: 2px solid #ecf0f1; }
        h3 { color: #34495e; font-size: 1.6rem; margin: 2rem 0 1rem; }
        h4 { color: #5d6d7e; font-size: 1.3rem; margin: 1.5rem 0 0.8rem; }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; text-align: justify; }
        .lead { font-size: 1.25rem; color: #495057; font-weight: 400; margin-bottom: 2rem; }
        .highlight { background: linear-gradient(120deg, #a8edea 0%, #fed6e3 100%); padding: 25px; border-radius: 12px; margin: 30px 0; border-left: 5px solid #3498db; }
        .tip { background: #e8f4fc; border-left: 5px solid #2980b9; padding: 20px; margin: 25px 0; border-radius: 0 8px 8px 0; }
        .tip i { color: #2980b9; margin-right: 10px; }
        .steps { list-style: none; counter-reset: step-counter; margin: 2rem 0; }
        .steps li { counter-increment: step-counter; margin-bottom: 1.8rem; padding-left: 3.5rem; position: relative; }
        .steps li:before {
            content: counter(step-counter);
            background: linear-gradient(135deg, #3498db, #2c3e50);
            color: white;
            font-weight: bold;
            font-size: 1.2rem;
            border-radius: 50%;
            width: 2.5rem;
            height: 2.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            position: absolute;
            left: 0;
            top: 0;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin: 30px 0;
        }
        .feature-card {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 12px;
            border-top: 4px solid #3498db;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .feature-card:hover { transform: translateY(-5px); box-shadow: 0 15px 25px rgba(0,0,0,0.1); }
        .feature-card h4 { margin-top: 0; }
        .btn {
            display: inline-block;
            background: linear-gradient(90deg, #3498db, #2c3e50);
            color: white;
            padding: 14px 28px;
            border-radius: 50px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
            text-align: center;
        }
        .btn:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(52, 152, 219, 0.5); color: white; }
        .btn-secondary { background: linear-gradient(90deg, #95a5a6, #7f8c8d); }
        .img-container { margin: 2.5rem 0; text-align: center; }
        .img-caption { font-style: italic; color: #7f8c8d; margin-top: 10px; font-size: 0.95rem; }
        .content-link { font-weight: 700; border-bottom: 2px dashed #3498db; }
        .update-time { color: #e74c3c; font-weight: bold; background: #ffeaa7; display: inline-block; padding: 5px 15px; border-radius: 20px; margin-bottom: 2rem; }
        .interactive-module { background: #f1f8ff; border: 2px solid #d1e3ff; border-radius: 12px; padding: 30px; margin: 40px 0; }
        .module-title { color: #1a237e; font-size: 1.8rem; margin-bottom: 1.5rem; }
        .search-form, .comment-form, .rating-form { display: flex; flex-wrap: wrap; gap: 15px; margin-top: 20px; }
        .form-group { flex: 1 1 300px; }
        label { display: block; margin-bottom: 8px; font-weight: 600; color: #2c3e50; }
        input, textarea, select {
            width: 100%;
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        input:focus, textarea:focus, select:focus { border-color: #3498db; outline: none; box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2); }
        textarea { min-height: 150px; resize: vertical; }
        .star-rating { display: flex; gap: 10px; font-size: 2rem; color: #f1c40f; margin: 10px 0; }
        .star-rating i { cursor: pointer; transition: transform 0.2s ease; }
        .star-rating i:hover { transform: scale(1.2); }
        footer { background: linear-gradient(90deg, #1a237e, #4a148c); color: #ecf0f1; padding: 50px 0 20px; margin-top: 50px; }
        .footer-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 40px; }
        .footer-section h3 { color: #00cfbb; font-size: 1.4rem; margin-bottom: 20px; }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 12px; }
        .footer-links a { color: #bdc3c7; }
        .footer-links a:hover { color: white; padding-left: 5px; }
        friend-link {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 10px 20px;
            border-radius: 6px;
            margin: 5px;
            border: 1px solid rgba(255,255,255,0.2);
        }
        friend-link a { color: #00cfbb; font-weight: bold; }
        .copyright { text-align: center; padding-top: 30px; margin-top: 30px; border-top: 1px solid rgba(255,255,255,0.1); color: #95a5a6; font-size: 0.9rem; }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            article { padding: 30px; }
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #1a237e;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 20px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.2);
            }
            .nav-links.active { display: flex; }
            .nav-links li { margin: 10px 0; }
            .hamburger { display: block; }
            .feature-grid { grid-template-columns: 1fr; }
            .footer-container { grid-template-columns: 1fr; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            .btn { padding: 12px 24px; width: 100%; }
            .interactive-module { padding: 20px; }
        }