/* ====== 公共CSS部分 ====== */
        :root {
            --primary: #1a365d; /* 深蓝 - 专业可靠 */
            --secondary: #2d6bc6; /* 科技蓝 - 现代感 */
            --accent: #00a8e8; /* 亮蓝 - 活力焦点 */
            --light: #f8fafc;
            --dark: #2d3748;
            --gray: #718096;
            --light-gray: #e2e8f0;
            --white: #ffffff;
            --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
            --radius: 8px;
            --radius-lg: 12px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: var(--dark);
            background-color: var(--white);
            overflow-x: hidden;
        }
        
        h1, h2, h3, h4, h5 {
            font-family: 'Manrope', sans-serif;
            font-weight: 700;
            line-height: 1.2;
        }
        
        a {
            text-decoration: none;
            color: inherit;
        }
        
        ul {
            list-style: none;
        }
        
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }
        
        .section {
            padding: 100px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 64px;
        }
        
        .section-title .subtitle {
            display: inline-block;
            color: var(--accent);
            font-weight: 600;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            margin-bottom: 12px;
            position: relative;
            padding-left: 40px;
        }
        
        .section-title .subtitle::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 30px;
            height: 2px;
            background-color: var(--accent);
        }
        
        .section-title h2 {
            font-size: 42px;
            color: var(--primary);
            margin-bottom: 16px;
            line-height: 1.1;
        }
        
        .section-title p {
            font-size: 18px;
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto;
        }
        
        /* 导航栏 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            padding: 20px 0;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.5);
            transition: var(--transition);
        }
        
        .navbar.scrolled {
            padding: 15px 0;
            box-shadow: var(--shadow-sm);
        }
        
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo-text {
            font-size: 28px;
            font-weight: 800;
            background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent), var(--secondary), var(--primary));
            background-size: 300% 100%;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: gradientShift 8s ease-in-out infinite;
            letter-spacing: 1px;
        }
        
        @keyframes gradientShift {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }
        
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 40px;
        }
        
        .nav-item {
            position: relative;
        }
        
        .nav-link {
            font-weight: 500;
            font-size: 16px;
            color: var(--dark);
            transition: var(--transition);
            padding: 8px 0;
        }
        
        .nav-link:hover {
            color: var(--accent);
        }
        
        .nav-link.active {
            color: var(--accent);
        }
        
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--accent);
        }
        
        .nav-phone {
            display: flex;
            align-items: center;
            gap: 10px;
            background-color: var(--accent);
            color: var(--white);
            padding: 12px 24px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(0, 168, 232, 0.25);
        }
        
        .nav-phone:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(0, 168, 232, 0.35);
            background-color: #0097d1;
        }
        
        .mobile-toggle {
            display: none;
            font-size: 24px;
            color: var(--primary);
            cursor: pointer;
        }
        
        /* 底部 */
        .footer {
            background-color: var(--primary);
            color: var(--white);
            padding: 80px 0 30px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 60px;
        }
        
        .footer-col h3 {
            font-size: 18px;
            margin-bottom: 24px;
            position: relative;
            padding-bottom: 12px;
        }
        
        .footer-col h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: var(--accent);
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
            font-size: 15px;
        }
        
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 5px;
        }
        
        .contact-info li {
            display: flex;
            align-items: flex-start;
            margin-bottom: 20px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
        }
        
        .contact-info i {
            color: var(--accent);
            margin-right: 12px;
            margin-top: 4px;
            font-size: 16px;
        }
        
        .qr-section {
            text-align: center;
        }
        
        .qr-code {
            width: 140px;
            height: 140px;
            background-color: var(--white);
            border-radius: var(--radius);
            padding: 10px;
            margin: 0 auto 15px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .qr-code img {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }
        
        .qr-text {
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }
        
        .footer-bottom {
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .copyright {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
        }
        
        .footer-logo {
            font-size: 22px;
            font-weight: 800;
            background: linear-gradient(90deg, var(--accent), #ffffff, var(--accent));
            background-size: 300% 100%;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: gradientShift 8s ease-in-out infinite;
        }
        
        .social-links {
            display: flex;
            gap: 16px;
        }
        
        .social-links a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            transition: var(--transition);
        }
        
        .social-links a:hover {
            background-color: var(--accent);
            transform: translateY(-3px);
        }
        
        /* 响应式 */
        @media (max-width: 1024px) {
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
                gap: 50px;
            }
        }
        
        @media (max-width: 768px) {
            .section {
                padding: 70px 0;
            }
            
            .section-title h2 {
                font-size: 32px;
            }
            
            .logo-text {
                font-size: 24px;
            }
            
            .nav-menu {
                position: fixed;
                top: 80px;
                left: -100%;
                flex-direction: column;
                background-color: var(--white);
                width: 100%;
                padding: 30px;
                box-shadow: var(--shadow-lg);
                transition: var(--transition);
                gap: 25px;
                align-items: flex-start;
            }
            
            .nav-menu.active {
                left: 0;
            }
            
            .mobile-toggle {
                display: block;
            }
            
            .nav-phone {
                padding: 10px 20px;
                font-size: 14px;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            
            .footer-bottom {
                flex-direction: column;
                gap: 20px;
                text-align: center;
            }
        }
        
        /* 动画类 */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }
        
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        /* ====== 公共CSS结束 ====== */