* {
            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: 1.6;
            overflow-x: hidden;
        }
        
        /* 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;
            text-decoration: none;
            cursor: pointer;
        }

        .logo:hover {
            color: #000;
            text-decoration: none;
        }
        
        .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 */
        .portfolio-header {
            padding: 120px 8% 80px;
            text-align: center;
            background: linear-gradient(135deg, #f5f7fa 0%, #e6e9ff 100%);
            position: relative;
            overflow: hidden;
        }
        
        .portfolio-header::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('https://images.unsplash.com/photo-1467232004584-a241de8bcf5d?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1469&q=80') no-repeat center center/cover;
            opacity: 0.05;
            z-index: 0;
        }
        
        .portfolio-title {
            font-size: 4rem;
            font-weight: 800;
            margin-bottom: 20px;
            background: linear-gradient(90deg, #000, #0071e3);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            position: relative;
        }
        
        .portfolio-subtitle {
            font-size: 1.6rem;
            color: #666;
            max-width: 700px;
            margin: 0 auto 40px;
            position: relative;
        }
        
        .portfolio-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            margin-top: 30px;
            position: relative;
        }
        
        .stat-item {
            background: rgba(255, 255, 255, 0.7);
            padding: 15px 30px;
            border-radius: 20px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            backdrop-filter: blur(5px);
        }
        
        .stat-item .number {
            font-size: 2.2rem;
            font-weight: 700;
            color: #0071e3;
        }
        
        /* 项目分类导航 */
        .portfolio-nav {
            padding: 30px 8%;
            background: #fff;
            border-bottom: 1px solid #eee;
            position: sticky;
            top: 80px;
            z-index: 900;
            box-shadow: 0 2px 10px rgba(0,0,0,0.03);
        }
        
        .portfolio-categories {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 15px;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .category-btn {
            padding: 12px 30px;
            background: #f0f7ff;
            color: #0071e3;
            border: none;
            border-radius: 50px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s;
            font-size: 1.05rem;
        }
        
        .category-btn:hover, .category-btn.active {
            background: #0071e3;
            color: white;
            transform: translateY(-3px);
        }
        
        /* 项目网格 */
        .portfolio-container {
            max-width: 1600px;
            margin: 60px auto;
            padding: 0 20px;
        }
        
        .portfolio-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
            gap: 30px;
        }
        
        .project-card {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: all 0.4s;
            background: #fff;
        }
        
        .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,113,227,0.15);
        }
        
        .project-image {
            width: 100%;
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        
        .project-card:hover .project-image {
            transform: scale(1.05);
        }
        
        .project-content {
            padding: 25px;
            position: relative;
            z-index: 2;
            background: white;
        }
        
        .project-category {
            display: inline-block;
            padding: 5px 15px;
            background: #f0f7ff;
            color: #0071e3;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-bottom: 15px;
        }
        
        .project-title {
            font-size: 1.6rem;
            margin-bottom: 15px;
            color: #000;
        }
        
        .project-desc {
            color: #555;
            line-height: 1.6;
            margin-bottom: 20px;
        }
        
        .project-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #f0f0f0;
        }
        
        .project-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        
        .project-tag {
            background: #f8f9ff;
            color: #0071e3;
            padding: 4px 12px;
            border-radius: 15px;
            font-size: 0.8rem;
        }
        
        .project-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: #f0f7ff;
            border-radius: 50%;
            color: #0071e3;
            transition: all 0.3s;
            text-decoration: none;
        }
        
        .project-link:hover {
            background: #0071e3;
            color: white;
            transform: rotate(15deg);
        }
        
        /* 特色项目 */
        .featured-projects {
            max-width: 1400px;
            margin: 100px auto;
            padding: 0 5%;
        }
        
        .section-title {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: 60px;
            color: #000;
        }
        
        .featured-project {
            display: flex;
            flex-wrap: wrap;
            background: #fff;
            border-radius: 25px;
            overflow: hidden;
            box-shadow: 0 15px 40px rgba(0,0,0,0.08);
            margin-bottom: 60px;
            transition: transform 0.4s;
        }
        
        .featured-project:hover {
            transform: translateY(-5px);
        }
        
        .featured-image {
            flex: 1;
            min-width: 300px;
            height: 450px;
            background: linear-gradient(45deg, #6a11cb, #2575fc);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.8rem;
            font-weight: 600;
            padding: 30px;
        }
        
        .featured-details {
            flex: 1;
            min-width: 300px;
            padding: 50px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        
        .featured-category {
            display: inline-block;
            padding: 6px 18px;
            background: #f0f7ff;
            color: #0071e3;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-bottom: 20px;
        }
        
        .featured-title {
            font-size: 2.2rem;
            margin-bottom: 20px;
            color: #000;
        }
        
        .featured-desc {
            color: #555;
            line-height: 1.8;
            margin-bottom: 30px;
        }
        
        .tech-stack {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 30px;
        }
        
        .tech-item {
            background: #f8f9ff;
            color: #0071e3;
            padding: 8px 18px;
            border-radius: 20px;
            font-size: 0.9rem;
        }
        
        .project-links {
            display: flex;
            gap: 15px;
        }
        
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            background: #0071e3;
            color: white;
            text-decoration: none;
            border-radius: 50px;
            font-weight: 500;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }
        
        .btn:hover {
            background: #0056b3;
            transform: scale(1.05);
        }
        
        .btn-outline {
            background: transparent;
            border: 2px solid #0071e3;
            color: #0071e3;
        }
        
        .btn-outline:hover {
            background: #0071e3;
            color: white;
        }
        
        /* 页脚 */
        .footer {
            background: #000;
            color: #fff;
            padding: 100px 8% 50px;
            margin-top: 100px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            margin-bottom: 70px;
        }
        
        .footer-column {
            flex: 1;
            min-width: 250px;
            margin-bottom: 40px;
        }
        
        .footer-column h3 {
            font-size: 1.5rem;
            margin-bottom: 25px;
            color: #fff;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 15px;
        }
        
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: #0071e3;
        }
        
        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 25px;
        }
        
        .social-icons a {
            display: inline-flex;
            justify-content: center;
            align-items: center;
            width: 45px;
            height: 45px;
            background: #222;
            border-radius: 50%;
            color: #fff;
            transition: all 0.3s;
        }
        
        .social-icons a:hover {
            background: #0071e3;
            transform: translateY(-5px);
        }
        
        .copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid #333;
            color: #777;
            font-size: 0.95rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            .portfolio-grid {
                grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            }
        }
        
        @media (max-width: 992px) {
            .featured-project {
                flex-direction: column;
            }
            
            .featured-image {
                height: 350px;
            }
        }
        
        @media (max-width: 768px) {
            .navbar {
                padding: 15px 5%;
            }
            
            .nav-links {
                display: none;
            }
            
            .portfolio-title {
                font-size: 2.8rem;
            }
            
            .portfolio-subtitle {
                font-size: 1.3rem;
            }
            
            .portfolio-stats {
                flex-direction: column;
                align-items: center;
                gap: 20px;
            }
            
            .portfolio-grid {
                grid-template-columns: 1fr;
            }
            
            .portfolio-nav {
                top: 70px;
            }
        }
        
        /* 动画效果 */
        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
            100% { transform: translateY(0px); }
        }
        
        .floating {
            animation: float 5s ease-in-out infinite;
        }
        
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease-out, transform 0.8s ease-out;
        }
        
        .fade-in.appear {
            opacity: 1;
            transform: translateY(0);
        }