* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        }
        
        body {
            background: #fafafa;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
          .dropdown {
            position: relative;
            display: inline-block;
        }

        .dropdown-content {
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
            z-index: 1;
            border-radius: 4px;
            overflow: hidden;
        }

        .dropdown-content a {
            color: black;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
            transition: background-color 0.3s;
        }

        .dropdown-content a:hover {
            background-color: #f1f1f1;
        }

        .dropdown:hover .dropdown-content {
            display: block;
        }

        .nav-links li {
            position: relative;
        }

        .nav-links li a {
            display: block;
            padding: 10px 15px;
            text-decoration: none;
        }

        .wechat-trigger {
            position: relative;
        }

        .wechat-qr {
            position: absolute;
            top: 100%;
            left: 0;
            width: 120px;
            height: 120px;
            border-radius: 6px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, .15);
            opacity: 0;
            visibility: hidden;
            transform: translateY(6px);
            transition: all .25s ease;
            z-index: 1000;
        }

        .wechat-trigger:hover .wechat-qr {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        /* 动画效果 */
        .fade-in {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }

        .fade-in.appear {
            opacity: 1;
            transform: translateY(0);
        }

        .floating {
            animation: float 6s ease-in-out infinite;
        }

        @keyframes float {
            0% {
                transform: translateY(0px);
            }

            50% {
                transform: translateY(-10px);
            }

            100% {
                transform: translateY(0px);
            }
        }
        /* 导航栏 */
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 8%;
            background: rgba(255, 255, 255, 0.97);
            backdrop-filter: blur(10px);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            border-bottom: 1px solid #eee;
        }
        
        .logo {
            font-size: 24px;
            font-weight: 700;
            color: #000;
            letter-spacing: -0.5px;
        }
        
        .logo span {
            color: #0071e3;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin: 0 15px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            font-size: 16px;
            transition: color 0.3s;
            position: relative;
        }
        
        .nav-links a.active {
            color: #0071e3;
        }
        
        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 100%;
            height: 2px;
            background: #0071e3;
        }
        
        .nav-links a:hover {
            color: #0071e3;
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: #0071e3;
            transition: width 0.3s;
        }
        
        .nav-links a:hover::after {
            width: 100%;
        }
        
        /* 页面头部 */
        .page-header {
            text-align: center;
            padding: 100px 8% 60px;
            background: linear-gradient(135deg, #f5f7fa 0%, #e6e9ff 100%);
            border-bottom: 1px solid #eee;
        }
        
        .page-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            background: linear-gradient(90deg, #000, #0071e3);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        
        .page-subtitle {
            font-size: 1.4rem;
            color: #666;
            max-width: 700px;
            margin: 0 auto 30px;
        }
        
        /* 分类容器 */
        .categories-container {
            max-width: 1400px;
            margin: 50px auto;
            padding: 0 5%;
        }
        
        .section-title {
            font-size: 2.2rem;
            margin-bottom: 30px;
            color: #000;
            display: flex;
            align-items: center;
        }
        
        .section-title i {
            margin-right: 15px;
            color: #0071e3;
        }
        
        /* 分类网格 */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 60px;
        }
        
        .category-card {
            background: #fff;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            transition: all 0.3s;
            border: 1px solid #f0f0f0;
            position: relative;
        }
        
        .category-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,113,227,0.15);
        }
        
        .category-header {
            padding: 30px;
            position: relative;
            z-index: 1;
        }
        
        .category-icon {
            width: 70px;
            height: 70px;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            color: white;
            margin-bottom: 20px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        
        .category-title {
            font-size: 1.8rem;
            margin-bottom: 10px;
            color: #000;
        }
        
        .category-count {
            color: #777;
            font-size: 1.1rem;
            margin-bottom: 20px;
        }
        
        .category-description {
            color: #555;
            line-height: 1.6;
            margin-bottom: 25px;
        }
        
        .category-link {
            display: inline-block;
            padding: 10px 25px;
            background: #f0f7ff;
            color: #0071e3;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 500;
            transition: all 0.3s;
        }
        
        .category-link:hover {
            background: #0071e3;
            color: white;
            transform: scale(1.05);
        }
        
        .category-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            opacity: 0.03;
            z-index: 0;
        }
        
        /* 分类文章展示 */
        .category-posts {
            margin-top: 50px;
        }
        
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .article-card {
            background: #fff;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            transition: all 0.3s;
            border: 1px solid #f0f0f0;
        }
        
        .article-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0,113,227,0.1);
        }
        
        .article-card-image {
            height: 200px;
            background: linear-gradient(45deg, #6a11cb, #2575fc);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
            font-size: 1.2rem;
            padding: 20px;
        }
        
        .article-card-content {
            padding: 25px;
        }
        
        .article-card-meta {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
            color: #888;
            font-size: 0.9rem;
        }
        
        .article-card-meta span {
            margin-right: 15px;
            display: flex;
            align-items: center;
        }
        
        .article-card-meta i {
            margin-right: 5px;
        }
        
        .article-card-title {
            font-size: 1.4rem;
            margin-bottom: 15px;
            color: #000;
            line-height: 1.4;
        }
        
        .article-card-excerpt {
            color: #666;
            margin-bottom: 20px;
            line-height: 1.6;
        }
        
        .article-card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 20px;
        }
        
        .article-card-button {
            display: inline-block;
            padding: 10px 25px;
            background: #0071e3;
            color: white;
            text-decoration: none;
            border-radius: 25px;
            font-weight: 500;
            transition: all 0.3s;
            text-align: center;
            margin-top: 10px;
        }
        
        .article-card-button:hover {
            background: #005bb5;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 113, 227, 0.3);
        }
        
        .tag {
            background: #f0f7ff;
            color: #0071e3;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.85rem;
            transition: all 0.3s;
        }
        
        .tag:hover {
            background: #0071e3;
            color: white;
            cursor: pointer;
        }
        

        
        /* 页脚 */
        .footer {
            background: #000;
            color: #fff;
            padding: 60px 8% 30px;
            margin-top: 50px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            margin-bottom: 50px;
        }
        
        .footer-column {
            flex: 1;
            min-width: 200px;
            margin-bottom: 30px;
        }
        
        .footer-column h3 {
            font-size: 1.5rem;
            margin-bottom: 20px;
            color: #fff;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: #0071e3;
        }
        
        .social-icons-footer {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        
        .social-icons-footer a {
            display: inline-flex;
            justify-content: center;
            align-items: center;
            width: 40px;
            height: 40px;
            background: #222;
            border-radius: 50%;
            color: #fff;
            transition: all 0.3s;
        }
        
        .social-icons-footer a:hover {
            background: #0071e3;
            transform: translateY(-5px);
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #333;
            color: #777;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 1024px) {
            .categories-grid {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            }
            
            .articles-grid {
                grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            }
        }
        
        @media (max-width: 768px) {
            .navbar {
                padding: 15px 5%;
            }
            
            .nav-links {
                display: none;
            }
            
            .page-title {
                font-size: 2.5rem;
            }
            
            .page-subtitle {
                font-size: 1.2rem;
            }
            
            .categories-grid {
                grid-template-columns: 1fr;
            }
            
            .articles-grid {
                grid-template-columns: 1fr;
            }
            
            .section-title {
                font-size: 1.8rem;
            }
        }
        
        /* 动画效果 */
        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-8px); }
            100% { transform: translateY(0px); }
        }
        
        .floating {
            animation: float 4s ease-in-out infinite;
        }
        
        .fade-in {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity 0.6s ease-out, transform 0.6s ease-out;
        }
        
        .fade-in.appear {
            opacity: 1;
            transform: translateY(0);
        }