* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            scroll-behavior: smooth;
            list-style: none;
        }
        
        html, body {
            width: 100%;
            overflow-x: hidden; 
            list-style: none;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: #1D2939;
            background-color: #F9FAFB;
            line-height: 1.6;
        }
        
        /* 基础样式 */
        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        h1, h2, h3, h4 {
            font-weight: 700;
            margin-bottom: 1rem;
        }
        
        h1 {
            font-size: clamp(2.5rem, 5vw, 4rem);
            line-height: 1.2;
        }
        
        h2 {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            text-align: center;
            margin-bottom: 1.5rem;
        }
        
        h3 {
            font-size: 1.5rem;
        }
        
        p {
            margin-bottom: 1rem;
            color: #666;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }
        
        img {
            max-width: 100%;
            display: block;
        }
        
        .btn {
            display: inline-block;
            padding: 10px 24px;
            border-radius: 30px;
            font-weight: 600;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }
        
        .btn-primary {
            background-color: #165DFF;
            color: white;
        }
        
        .btn-primary:hover {
            background-color: #0E4CD1;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(22, 93, 255, 0.3);
        }
        
        .btn-outline {
            border: 2px solid #165DFF;
            color: #165DFF;
            background: transparent;
        }
        
        .btn-outline:hover {
            background-color: rgba(22, 93, 255, 0.05);
            transform: translateY(-2px);
        }
        
        .section {
            padding: 5rem 0;
            position: relative; /* 确保内部绝对定位元素相对于section定位 */
        }
        
        .section-white {
            background-color: white;
        }
        
        .section-gray {
            background-color: #f1f3f5;
        }
        
        .section-title {
            position: relative;
            margin-bottom: 4rem;
        }
        
        .section-title::after {
            content: '';
            display: block;
            width: 50px;
            height: 3px;
            background-color: #165DFF;
            margin: 1rem auto 0;
        }
        
        .section-desc {
            text-align: center;
            max-width: 600px;
            margin: 0 auto 2rem;
            color: #666;
        }
        
        /* 导航栏 */
        .navbar {
            position: fixed;
            top: 0;
            width: 100%;
            padding: 1.5rem 0;
            z-index: 100;
            transition: all 0.3s ease;
        }
        
        .navbar-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: #165DFF;
        }
        
        .nav-links {
            display: flex;
            gap: 2rem;
        }
        
        .nav-link {
            font-weight: 500;
        }
        
        .nav-link:hover {
            color: #165DFF;
        }
        
        .nav-dropdown {
            position: relative;
            display: inline-block;
        }
        
        .dropdown-content {
            display: none;
            position: absolute;
            background-color: white;
            min-width: 160px;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            z-index: 1;
            border-radius: 4px;
        }
        
        .dropdown-content a {
            color: #1D2939;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
        }
        
        .dropdown-content a:hover {
            background-color: #f1f3f5;
        }
        
        .nav-dropdown:hover .dropdown-content {
            display: block;
        }
        
        .menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        .mobile-menu {
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background: white;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            padding: 1rem 0;
            transform: translateY(-20px);
            opacity: 0;
            pointer-events: none;
            transition: all 0.3s ease;
        }
        
        .mobile-menu.active {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        
        .mobile-links {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            padding: 0 1rem;
        }
        
        .mobile-link {
            padding: 0.5rem 0;
            border-bottom: 1px solid #f1f3f5;
        }
        
        .navbar.scrolled {
            background-color: white;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            padding: 1rem 0;
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            
            .menu-btn {
                display: block;
            }
            
            .about-details {
                grid-template-columns: 1fr;
            }
            
            .tools-grid {
                grid-template-columns: 1fr;
            }
            
            .hobby-card {
                width: 150px;
                padding: 0.8rem;
            }
            
            .design-philosophy {
                max-width: 250px;
                padding: 1rem;
                bottom: -20px;
                right: -20px;
            }
            
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }