:root {
            --primary-black: #000000;
            --primary-red: #DD0000;
            --primary-gold: #FFCC00;
            --secondary-gray: #333333;
            --light-gray: #f5f5f5;
            --white: #ffffff;
            --card-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: var(--light-gray);
            color: var(--secondary-gray);
            line-height: 1.6;
            transition: all 0.3s ease;
            overflow-x: hidden;
        }
        
        /* 语言切换器样式 */
        .language-switcher {
            position: fixed;
            top: 25px;
            right: 30px;
            z-index: 1000;
            display: flex;
            gap: 10px;
            background: rgba(255, 255, 255, 0.9);
            padding: 8px 12px;
            border-radius: 30px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .lang-btn {
            background: transparent;
            border: none;
            padding: 6px 15px;
            border-radius: 30px;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s ease;
        }
        
        .lang-btn.active {
            background: var(--primary-black);
            color: var(--white);
        }
        
        .lang-btn:hover {
            transform: translateY(-2px);
        }
        
        /* 导航栏样式 */
        header {
            background: linear-gradient(135deg, var(--primary-black) 0%, var(--secondary-gray) 100%);
            color: var(--white);
            padding: 1.5rem 0;
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
        }
        
        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 1.8rem;
            font-weight: bold;
            letter-spacing: 0.5px;
        }
        
        .logo-sinohr {
            color: var(--primary-gold);
        }
        
        .logo-tech {
            color: var(--white);
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 1.5rem;
        }
        
        .nav-links a {
            color: var(--white);
            text-decoration: none;
            font-weight: 500;
            position: relative;
            padding: 5px 0;
            transition: all 0.3s ease;
            font-size: 0.95rem;
        }
        
        .nav-links a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-gold);
            transition: width 0.3s ease;
        }
        
        .nav-links a:hover:after {
            width: 100%;
        }
        
        /* 英雄区域样式 */
        .hero {
            background: linear-gradient(rgba(0,0,0,0.75), rgba(0,0,0,0.85)), url('https://images.unsplash.com/photo-1508784411316-02b8cd4d3a3c?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80');
            background-size: cover;
            background-position: center;
            color: var(--white);
            padding: 8rem 0 6rem;
            text-align: center;
            position: relative;
        }
        
        .hero-content {
            max-width: 850px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }
        
        .hero h1 {
            font-size: 3.6rem;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 8px rgba(0,0,0,0.7);
            font-weight: 700;
            line-height: 1.2;
        }
        
        .hero p {
            font-size: 1.5rem;
            margin-bottom: 2.5rem;
            text-shadow: 0 1px 3px rgba(0,0,0,0.6);
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .cta-button {
            display: inline-block;
            background: var(--primary-red);
            color: var(--white);
            padding: 16px 42px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: bold;
            font-size: 1.15rem;
            margin: 0 12px 15px;
            transition: all 0.4s ease;
            border: 2px solid var(--primary-red);
            box-shadow: 0 4px 12px rgba(221, 0, 0, 0.3);
        }
        
        .cta-button:hover {
            background: transparent;
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(221, 0, 0, 0.4);
        }
        
        .cta-button.secondary {
            background: transparent;
            border-color: var(--white);
            box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
        }
        
        .cta-button.secondary:hover {
            background: var(--white);
            color: var(--primary-black);
        }
        
        /* 服务部分样式 */
        .services {
            padding: 5.5rem 0;
            background: var(--white);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 3.5rem;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.7rem;
            color: var(--primary-black);
            margin-bottom: 1.2rem;
            font-weight: 700;
        }
        
        .section-title:after {
            content: '';
            display: block;
            width: 100px;
            height: 5px;
            background: var(--primary-red);
            margin: 0 auto;
            border-radius: 3px;
        }
        
        .section-subtitle {
            max-width: 700px;
            margin: 0 auto 2.5rem;
            text-align: center;
            font-size: 1.2rem;
            color: #555;
        }
        
        .services-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        
        .service-card {
            background: var(--light-gray);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: all 0.4s ease;
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        
        .service-card:hover {
            transform: translateY(-12px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.18);
        }
        
        .service-icon {
            background: linear-gradient(135deg, var(--primary-black) 0%, #222 100%);
            color: var(--primary-gold);
            font-size: 2.8rem;
            padding: 2.2rem;
            text-align: center;
        }
        
        .service-content {
            padding: 2.2rem;
            flex-grow: 1;
        }
        
        .service-content h3 {
            font-size: 1.6rem;
            margin-bottom: 1.2rem;
            color: var(--primary-black);
        }
        
        .service-content ul {
            list-style: none;
            margin-top: 1.2rem;
        }
        
        .service-content ul li {
            padding: 0.7rem 0;
            position: relative;
            padding-left: 30px;
            font-size: 1.05rem;
        }
        
        .service-content ul li:before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--primary-red);
            font-weight: bold;
            font-size: 1.2rem;
        }
        
        /* 关于我们样式 */
        .about {
            padding: 5.5rem 0;
            background: linear-gradient(to right, #f0f0f0 50%, var(--white) 50%);
            position: relative;
        }
        
        .about-content {
            display: flex;
            align-items: center;
            gap: 4rem;
        }
        
        .about-text {
            flex: 1;
        }
        
        .about-text h2 {
            font-size: 2.7rem;
            color: var(--primary-black);
            margin-bottom: 1.8rem;
        }
        
        .about-text p {
            margin-bottom: 1.6rem;
            font-size: 1.1rem;
            line-height: 1.7;
        }
        
        .about-image {
            flex: 1;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transform: rotate(-2deg);
            transition: transform 0.4s ease;
        }
        
        .about-image:hover {
            transform: rotate(0deg) scale(1.02);
        }
        
        .about-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        
        .about-image:hover img {
            transform: scale(1.05);
        }
        
        /* 团队介绍样式 */
        .team {
            padding: 6rem 0;
            background: linear-gradient(135deg, #f9f9f9 0%, #f0f0f0 100%);
            position: relative;
            overflow: hidden;
        }
        
        .team::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 10px;
            background: linear-gradient(90deg, var(--primary-black), var(--primary-red), var(--primary-gold));
        }
        
        .team-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2.5rem;
            margin-top: 3rem;
        }
        
        .team-member {
            background: var(--white);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: all 0.4s ease;
            text-align: center;
        }
        
        .team-member:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.15);
        }
        
        .member-photo {
            height: 280px;
            overflow: hidden;
        }
        
        .member-photo img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        
        .team-member:hover .member-photo img {
            transform: scale(1.1);
        }
        
        .member-info {
            padding: 2rem;
        }
        
        .member-info h3 {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
            color: var(--primary-black);
        }
        
        .member-position {
            color: var(--primary-red);
            font-weight: bold;
            margin-bottom: 1.2rem;
            font-size: 1.1rem;
        }
        
        .member-bio {
            color: #555;
            font-size: 1rem;
            line-height: 1.6;
        }
        
        .social-links {
            margin-top: 1.5rem;
            display: flex;
            justify-content: center;
            gap: 15px;
        }
        
        .social-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--primary-black);
            color: var(--white);
            border-radius: 50%;
            transition: all 0.3s ease;
        }
        
        .social-links a:hover {
            background: var(--primary-red);
            transform: translateY(-3px);
        }
        
        /* 成功案例样式 */
        .success-stories {
            padding: 6rem 0;
            background: var(--primary-black);
            color: var(--white);
            position: relative;
        }
        
        .stories-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2.5rem;
        }
        
        .story-card {
            background: rgba(255,255,255,0.08);
            border-radius: 12px;
            padding: 2.5rem;
            transition: all 0.4s ease;
            position: relative;
            overflow: hidden;
        }
        
        .story-card:hover {
            background: rgba(255,255,255,0.12);
            transform: translateY(-8px);
        }
        
        .story-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background: var(--primary-red);
            opacity: 0.1;
        }
        
        .story-card h3 {
            color: var(--primary-gold);
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
        }
        
        .quote {
            font-style: italic;
            position: relative;
            padding: 0 1.5rem;
            font-size: 1.1rem;
            line-height: 1.8;
        }
        
        .quote:before, .quote:after {
            content: '"';
            font-size: 3.5rem;
            color: var(--primary-red);
            position: absolute;
            opacity: 0.3;
            font-family: Georgia, serif;
        }
        
        .quote:before {
            top: -25px;
            left: -10px;
        }
        
        .quote:after {
            bottom: -45px;
            right: -10px;
        }
        
        .author {
            margin-top: 2rem;
            font-weight: bold;
            color: #ccc;
        }
        
        /* 联系表单样式 */
        .contact {
            padding: 6rem 0;
            background: var(--white);
        }
        
        .contact-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3.5rem;
        }
        
        .contact-info {
            padding: 2rem;
        }
        
        .contact-info h3 {
            font-size: 2rem;
            margin-bottom: 1.8rem;
            color: var(--primary-black);
        }
        
        .contact-details {
            margin-bottom: 2.5rem;
        }
        
        .contact-details p {
            margin-bottom: 1.5rem;
            display: flex;
            align-items: flex-start;
            font-size: 1.1rem;
        }
        
        .contact-details i {
            margin-right: 15px;
            color: var(--primary-red);
            width: 24px;
            font-size: 1.3rem;
            margin-top: 4px;
        }
        
        .contact-form {
            background: var(--light-gray);
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: var(--card-shadow);
        }
        
        .form-group {
            margin-bottom: 1.8rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.8rem;
            font-weight: 500;
            font-size: 1.1rem;
        }
        
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 14px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 1.05rem;
            transition: border-color 0.3s ease;
        }
        
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: var(--primary-red);
            outline: none;
            box-shadow: 0 0 0 3px rgba(221, 0, 0, 0.1);
        }
        
        .form-group textarea {
            height: 160px;
            resize: vertical;
        }
        
        /* 页脚样式 */
        footer {
            background: var(--primary-black);
            color: var(--white);
            padding: 4rem 0 1.5rem;
            position: relative;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        
        .footer-column h3 {
            color: var(--primary-gold);
            margin-bottom: 1.8rem;
            font-size: 1.4rem;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--primary-red);
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 1rem;
            display: flex;
            align-items: flex-start;
        }
        
        .footer-links a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: all 0.3s ease;
            display: inline-block;
        }
        
        .footer-links a:hover {
            color: var(--primary-gold);
            transform: translateX(5px);
        }
        
        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 1.5rem;
        }
        
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            background: rgba(255,255,255,0.1);
            color: var(--white);
            border-radius: 50%;
            font-size: 1.2rem;
            transition: all 0.3s ease;
        }
        
        .social-icons a:hover {
            background: var(--primary-red);
            transform: translateY(-3px);
        }
        
        .copyright {
            text-align: center;
            padding-top: 2.5rem;
            border-top: 1px solid rgba(255,255,255,0.15);
            font-size: 1rem;
            color: rgba(255,255,255,0.6);
        }
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            .services-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 3rem;
            }
            
            .hero p {
                font-size: 1.3rem;
            }
            
            .about-content {
                flex-direction: column;
            }
            
            .contact-container {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .services-grid {
                grid-template-columns: 1fr;
            }
            
            .navbar {
                flex-direction: column;
                text-align: center;
            }
            
            .nav-links {
                margin-top: 1.5rem;
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .nav-links li {
                margin: 0.8rem 1.2rem;
            }
            
            .hero {
                padding: 6rem 0 4rem;
            }
            
            .hero h1 {
                font-size: 2.5rem;
            }
            
            .hero p {
                font-size: 1.2rem;
            }
            
            .section-title h2 {
                font-size: 2.3rem;
            }
            
            .cta-buttons {
                display: flex;
                flex-direction: column;
                gap: 15px;
            }
            
            .cta-button {
                margin: 8px 0;
                display: block;
                text-align: center;
            }
        }
        
        /* 语言内容切换 */
        .lang-cn {
            display: none;
        }
        
        body.cn .lang-de {
            display: none;
        }
        
        body.cn .lang-cn {
            display: block;
        }
        
        /* 动画效果 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .animate-on-scroll {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }
        
        .animate-on-scroll.animated {
            opacity: 1;
            transform: translateY(0);
        }
        
        /* 懒加载样式 */
        .lazy {
            transition: opacity 0.3s ease;
        }
        
        .lazy.loading {
            opacity: 0.5;
        }