* { 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; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .hidden { display: none !important; }
        .emoji { font-size: 1.2em; margin: 0 5px; }
        .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-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Arial Black', sans-serif;
            font-size: 2rem;
            color: #4CAF50;
            text-decoration: none;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            transition: transform 0.3s ease;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover { transform: scale(1.05); }
        .my-logo i { font-size: 2.5rem; }
        .breadcrumb {
            background-color: #f8f9fa;
            padding: 12px 0;
            border-bottom: 1px solid #dee2e6;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li { margin-right: 10px; }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 10px;
            color: #6c757d;
        }
        .breadcrumb a { color: #007bff; text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        .main-nav { display: flex; align-items: center; }
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .nav-menu a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 4px;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-menu a:hover, .nav-menu a.active {
            background-color: rgba(255,255,255,0.15);
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .search-container {
            background: linear-gradient(90deg, #3498db, #2c80b9);
            padding: 1.5rem 0;
            margin-bottom: 2rem;
        }
        .search-form {
            max-width: 600px;
            margin: 0 auto;
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .search-input {
            flex: 1;
            padding: 15px 25px;
            border: none;
            font-size: 1.1rem;
            outline: none;
        }
        .search-button {
            background: #2c3e50;
            color: white;
            border: none;
            padding: 0 30px;
            cursor: pointer;
            font-size: 1.1rem;
            transition: background 0.3s;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .search-button:hover { background: #1a252f; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .article-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1 {
            font-size: 2.8rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 6px solid #4CAF50;
            padding-left: 20px;
        }
        h2 {
            font-size: 2rem;
            color: #3498db;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 10px;
            border-bottom: 2px solid #f1f8ff;
        }
        h3 {
            font-size: 1.6rem;
            color: #2c3e50;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #555;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.05rem;
            color: #444;
            text-align: justify;
        }
        .lead {
            font-size: 1.25rem;
            color: #2c3e50;
            font-weight: 500;
            background-color: #f8f9fa;
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 4px solid #3498db;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 2px 6px;
            border-radius: 3px;
        }
        a.content-link {
            color: #e74c3c;
            text-decoration: none;
            border-bottom: 1px dotted #e74c3c;
            font-weight: 600;
        }
        a.content-link:hover {
            color: #c0392b;
            border-bottom-style: solid;
        }
        .featured-image {
            margin: 2.5rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            max-width: 900px;
        }
        .featured-image figcaption {
            text-align: center;
            font-style: italic;
            color: #666;
            padding: 10px;
            background: #f9f9f9;
            font-size: 0.9rem;
        }
        .tip-box {
            background: #e8f4fd;
            border-left: 5px solid #3498db;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .tip-box h4 { color: #2980b9; margin-top: 0; }
        .cheat-box {
            background: #fff8e1;
            border: 2px dashed #ffb300;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 8px;
        }
        .stat-card {
            background: linear-gradient(135deg, #4CAF50, #2E7D32);
            color: white;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 1.5rem 0;
            text-align: center;
            box-shadow: 0 5px 15px rgba(76, 175, 80, 0.2);
        }
        .stat-card h3 { color: white; margin: 0 0 10px; }
        .stat-card .number { font-size: 3rem; font-weight: 700; }
        .user-feedback {
            background: #f8f9fa;
            padding: 2.5rem;
            border-radius: 12px;
            margin: 3rem 0;
            border: 1px solid #e9ecef;
        }
        .form-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-top: 1.5rem;
        }
        .form-group { margin-bottom: 1.2rem; }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #495057;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ced4da;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s, box-shadow 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #80bdff;
            box-shadow: 0 0 0 0.2rem rgba(0,123,255,0.25);
        }
        .submit-btn {
            background: linear-gradient(90deg, #3498db, #2980b9);
            color: white;
            border: none;
            padding: 14px 30px;
            border-radius: 6px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .submit-btn:hover {
            background: linear-gradient(90deg, #2980b9, #1c5a7d);
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(52, 152, 219, 0.3);
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            margin: 15px 0;
        }
        .rating-stars input { display: none; }
        .rating-stars label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
            margin: 0;
        }
        .rating-stars label:hover,
        .rating-stars label:hover ~ label,
        .rating-stars input:checked ~ label {
            color: #ffc107;
        }
        .site-footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h3 {
            color: #4CAF50;
            margin-bottom: 1.2rem;
            font-size: 1.4rem;
        }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 10px; }
        .footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover { color: #4CAF50; padding-left: 5px; }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin: 1.5rem 0;
        }
        friend-link {
            background: rgba(255,255,255,0.1);
            padding: 10px 15px;
            border-radius: 6px;
            transition: background 0.3s;
        }
        friend-link:hover { background: rgba(76, 175, 80, 0.2); }
        friend-link a {
            color: #4CAF50;
            text-decoration: none;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        .update-time {
            background: #1a252f;
            color: #ecf0f1;
            text-align: center;
            padding: 10px;
            font-size: 0.9rem;
            margin-top: 2rem;
        }
        @media (max-width: 768px) {
            .header-container { flex-direction: column; gap: 15px; }
            .my-logo { font-size: 1.8rem; }
            .hamburger { display: block; }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #2c3e50;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem;
                box-shadow: 0 10px 15px rgba(0,0,0,0.1);
                border-top: 1px solid rgba(255,255,255,0.1);
            }
            .nav-menu.active { display: flex; }
            .nav-menu li { width: 100%; }
            .nav-menu a { justify-content: center; padding: 12px; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .article-content { padding: 1.5rem; }
            .sidebar { position: static; }
        }