* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary-color: #1a237e;
            --secondary-color: #ff4081;
            --accent-color: #4caf50;
            --text-dark: #212121;
            --text-light: #757575;
            --bg-light: #f5f5f5;
            --bg-white: #ffffff;
            --border-color: #e0e0e0;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.8;
            color: var(--text-dark);
            background-color: var(--bg-white);
            overflow-x: hidden;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary-color) 0%, #283593 100%);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 80px;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover {
            color: var(--secondary-color);
            transform: scale(1.02);
            transition: var(--transition);
        }
        .my-logo i {
            color: var(--secondary-color);
        }
        .main-nav {
            display: flex;
            gap: 30px;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 4px;
            transition: var(--transition);
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        .hamburger-menu {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .breadcrumb {
            background-color: var(--bg-light);
            padding: 15px 20px;
            font-size: 0.9rem;
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb-container {
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .breadcrumb a {
            color: var(--text-light);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .breadcrumb span {
            margin: 0 8px;
            color: var(--text-light);
        }
        .main-container {
            max-width: var(--max-width);
            margin: 40px auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-content {
            background: var(--bg-white);
            padding: 40px;
            border-radius: 12px;
            box-shadow: var(--shadow);
        }
        .article-header {
            margin-bottom: 40px;
            padding-bottom: 25px;
            border-bottom: 3px solid var(--secondary-color);
        }
        h1 {
            font-size: 2.8rem;
            line-height: 1.2;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text-light);
            font-size: 0.95rem;
            flex-wrap: wrap;
            gap: 15px;
        }
        .update-time {
            background-color: #e8f5e9;
            padding: 8px 16px;
            border-radius: 20px;
            color: #2e7d32;
            font-weight: 600;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-color);
            margin: 50px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border-color);
        }
        h3 {
            font-size: 1.6rem;
            color: #37474f;
            margin: 35px 0 15px;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--text-light);
            margin: 25px 0 12px;
        }
        p {
            margin-bottom: 25px;
            text-align: justify;
        }
        .highlight {
            background-color: #fff8e1;
            padding: 25px;
            border-left: 4px solid #ffb300;
            margin: 30px 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-image {
            width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 30px 0;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .feature-image:hover {
            transform: scale(1.01);
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: var(--text-light);
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .user-interaction {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            padding: 30px;
            border-radius: 12px;
            margin: 40px 0;
            border: 1px solid var(--border-color);
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin-top: 20px;
        }
        .interaction-form {
            background: white;
            padding: 25px;
            border-radius: 8px;
            box-shadow: var(--shadow);
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--primary-color);
        }
        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(26, 35, 126, 0.1);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .rating-stars {
            display: flex;
            gap: 8px;
            margin: 15px 0;
        }
        .star {
            color: #ddd;
            font-size: 1.8rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        .btn {
            background: linear-gradient(135deg, var(--primary-color) 0%, #283593 100%);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(26, 35, 126, 0.25);
        }
        .btn-secondary {
            background: linear-gradient(135deg, var(--secondary-color) 0%, #f50057 100%);
        }
        .related-links {
            margin: 40px 0;
            padding: 30px;
            background-color: #f8f9fa;
            border-radius: 12px;
            border-left: 4px solid var(--accent-color);
        }
        .links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }
        .link-card {
            background: white;
            padding: 20px;
            border-radius: 8px;
            text-decoration: none;
            color: var(--text-dark);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 15px;
        }
        .link-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
            border-color: var(--primary-color);
        }
        .link-card i {
            color: var(--primary-color);
            font-size: 1.5rem;
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-widget {
            background: white;
            padding: 25px;
            border-radius: 12px;
            margin-bottom: 25px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
        }
        .widget-title {
            color: var(--primary-color);
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--border-color);
            font-size: 1.3rem;
        }
        .search-widget .form-group {
            display: flex;
        }
        .search-widget input {
            flex: 1;
            border-right: 0;
            border-radius: 6px 0 0 6px;
        }
        .search-widget button {
            border-radius: 0 6px 6px 0;
            padding: 0 20px;
        }
        .table-of-contents {
            max-height: 400px;
            overflow-y: auto;
        }
        .toc-list {
            list-style: none;
        }
        .toc-list li {
            margin-bottom: 12px;
            padding-left: 15px;
            position: relative;
        }
        .toc-list li:before {
            content: "•";
            color: var(--secondary-color);
            position: absolute;
            left: 0;
            font-size: 1.2rem;
        }
        .toc-list a {
            color: var(--text-dark);
            text-decoration: none;
            transition: var(--transition);
        }
        .toc-list a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .site-footer {
            background: linear-gradient(135deg, #263238 0%, #37474f 100%);
            color: white;
            padding: 60px 20px 30px;
            margin-top: 60px;
        }
        .footer-container {
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.4rem;
            margin-bottom: 25px;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            padding: 15px;
            margin-bottom: 10px;
            border-radius: 6px;
            transition: var(--transition);
            color: #bbdefb;
            text-decoration: none;
        }
        friend-link:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateX(5px);
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #b0bec5;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            .main-container {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                height: 70px;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                right: 0;
                background: var(--primary-color);
                flex-direction: column;
                padding: 20px;
                gap: 15px;
                box-shadow: var(--shadow);
            }
            .main-nav.active {
                display: flex;
            }
            .hamburger-menu {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .article-content {
                padding: 25px;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
            .links-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .header-container {
                padding: 0 15px;
            }
            .my-logo {
                font-size: 1.8rem;
            }
            h1 {
                font-size: 1.8rem;
            }
            .article-meta {
                flex-direction: column;
                align-items: flex-start;
            }
            .user-interaction {
                padding: 20px;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .article-content {
            animation: fadeIn 0.8s ease-out;
        }
        .highlight-text {
            background: linear-gradient(120deg, #ffecb3 0%, #ffecb3 100%);
            background-repeat: no-repeat;
            background-size: 100% 0.3em;
            background-position: 0 88%;
            transition: background-size 0.3s ease;
        }
        .highlight-text:hover {
            background-size: 100% 100%;
        }
        .stat-badge {
            display: inline-block;
            background: var(--accent-color);
            color: white;
            padding: 4px 12px;
            border-radius: 12px;
            font-size: 0.85rem;
            font-weight: 600;
            margin: 0 5px;
        }
        .text-center { text-align: center; }
        .text-bold { font-weight: 700; }
        .text-italic { font-style: italic; }
        .text-primary { color: var(--primary-color); }
        .text-secondary { color: var(--secondary-color); }
        .mb-30 { margin-bottom: 30px; }
        .mt-30 { margin-top: 30px; }
        .p-20 { padding: 20px; }