* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: #2a5ea8;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #1d3d6f;
        }
        ul, ol {
            padding-left: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .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);
            white-space: nowrap;
            border: 0;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            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-size: 2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            color: #ffcc00;
        }
        .my-logo:hover {
            color: #ffcc00;
        }
        .breadcrumb {
            background-color: #eef2f7;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: #555;
        }
        .breadcrumb a:hover {
            color: #1a237e;
        }
        .breadcrumb span {
            color: #888;
        }
        .breadcrumb .separator {
            margin: 0 8px;
            color: #bbb;
        }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-list a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-list a:hover {
            color: #ffcc00;
        }
        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: #ffcc00;
            transition: width 0.3s ease;
        }
        .nav-list a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 5px;
        }
        .mobile-search {
            display: none;
            margin-top: 1rem;
            width: 100%;
        }
        .mobile-search form {
            width: 100%;
        }
        .mobile-search input {
            width: 100%;
        }
        .search-bar {
            background-color: #fff;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin: 2rem 0;
            text-align: center;
        }
        .search-bar h2 {
            margin-bottom: 1rem;
            color: #1a237e;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-form input {
            flex-grow: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid #ddd;
            border-radius: 30px 0 0 30px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-form input:focus {
            border-color: #3949ab;
        }
        .search-form button {
            background: linear-gradient(to right, #3949ab, #283593);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 0 30px 30px 0;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: linear-gradient(to right, #283593, #1a237e);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 3rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background-color: white;
            padding: 3rem;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.06);
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #eee;
            font-size: 0.95rem;
            color: #666;
        }
        .update-time {
            color: #2a5ea8;
            font-weight: 600;
        }
        .hero-image {
            width: 100%;
            border-radius: 10px;
            margin: 2rem 0;
            overflow: hidden;
        }
        .hero-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .hero-image:hover img {
            transform: scale(1.03);
        }
        .article-content h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        .article-content h2 {
            font-size: 2rem;
            color: #283593;
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
        }
        .article-content h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2.5rem 0 1rem;
        }
        .article-content h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 2rem 0 1rem;
        }
        .article-content p {
            margin-bottom: 1.8rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fff8e1;
            border-left: 5px solid #ffcc00;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .keyword-bold {
            font-weight: 800;
            color: #1a237e;
        }
        .related-links {
            background-color: #f1f8ff;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2.5rem 0;
        }
        .related-links h3 {
            color: #1565c0;
            margin-top: 0;
        }
        .related-links ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 10px;
            list-style: none;
            padding-left: 0;
        }
        .related-links li {
            margin-bottom: 0.5rem;
        }
        .related-links a {
            color: #2a5ea8;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .related-links a:hover {
            color: #0d47a1;
            text-decoration: underline;
        }
        .stats-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .stat-item {
            background: linear-gradient(145deg, #e3f2fd, #bbdefb);
            padding: 1.5rem;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: #1a237e;
            display: block;
        }
        .stat-label {
            font-size: 1rem;
            color: #546e7a;
        }
        .sidebar {
            background-color: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.06);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar-section {
            margin-bottom: 2.5rem;
        }
        .sidebar-section h3 {
            color: #1a237e;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
            font-size: 1.4rem;
        }
        .rating-widget {
            text-align: center;
        }
        .stars {
            font-size: 2rem;
            color: #ffcc00;
            margin-bottom: 1rem;
            cursor: pointer;
        }
        .stars span {
            margin: 0 3px;
            transition: color 0.2s;
        }
        .stars span:hover,
        .stars span.active {
            color: #ff9800;
        }
        .download-btn {
            display: block;
            width: 100%;
            background: linear-gradient(to right, #34a853, #2e8b57);
            color: white;
            text-align: center;
            padding: 1rem;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1.1rem;
            margin-top: 1rem;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .download-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(52, 168, 83, 0.3);
            color: white;
        }
        .sidebar-links {
            list-style: none;
            padding-left: 0;
        }
        .sidebar-links li {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px dotted #eee;
        }
        .sidebar-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #555;
        }
        .sidebar-links a:hover {
            color: #1a237e;
        }
        .user-interaction {
            background-color: white;
            padding: 3rem;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.06);
            margin: 3rem 0;
        }
        .interaction-tabs {
            display: flex;
            border-bottom: 2px solid #eee;
            margin-bottom: 2rem;
        }
        .tab-btn {
            padding: 1rem 2rem;
            background: none;
            border: none;
            font-size: 1.1rem;
            font-weight: 600;
            color: #777;
            cursor: pointer;
            position: relative;
        }
        .tab-btn.active {
            color: #1a237e;
        }
        .tab-btn.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: #1a237e;
        }
        .tab-content {
            display: none;
        }
        .tab-content.active {
            display: block;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #444;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.9rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border-color 0.3s;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: #3949ab;
        }
        .submit-btn {
            background: linear-gradient(to right, #3949ab, #283593);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
        }
        .submit-btn:hover {
            background: linear-gradient(to right, #283593, #1a237e);
            transform: translateY(-2px);
        }
        .rating-slider {
            width: 100%;
            margin: 1rem 0;
        }
        .slider-value {
            text-align: center;
            font-size: 1.8rem;
            font-weight: 800;
            color: #1a237e;
            margin-top: 1rem;
        }
        .site-footer {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 4rem 0 2rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
            margin-bottom: 3rem;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 800;
            color: white;
            margin-bottom: 1rem;
            display: block;
        }
        .footer-links h4 {
            color: #ffcc00;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #ddd;
        }
        .footer-links a:hover {
            color: #ffcc00;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.1);
            padding: 1.5rem;
            border-radius: 8px;
            margin-top: 1.5rem;
        }
        friend-link h4 {
            color: #ffcc00;
            margin-bottom: 1rem;
        }
        friend-link ul {
            list-style: none;
            padding-left: 0;
        }
        friend-link li {
            margin-bottom: 0.5rem;
        }
        friend-link a {
            color: #ddd;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        friend-link a:hover {
            color: #ffcc00;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.95rem;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: 80px;
                left: 0;
                width: 100%;
                background-color: #1a237e;
                flex-direction: column;
                align-items: flex-start;
                padding: 2rem;
                clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
                transition: clip-path 0.4s ease;
                z-index: 999;
            }
            .main-nav.active {
                clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
            }
            .nav-list {
                flex-direction: column;
                gap: 1.5rem;
                width: 100%;
            }
            .mobile-search {
                display: block;
            }
            .header-container {
                flex-wrap: wrap;
            }
            .article-content {
                padding: 2rem;
            }
            .article-content h1 {
                font-size: 2.2rem;
            }
            .article-content h2 {
                font-size: 1.8rem;
            }
            .user-interaction {
                padding: 2rem;
            }
            .tab-btn {
                padding: 0.8rem 1.5rem;
                font-size: 1rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }