/* 重置样式和基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Microsoft JhengHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    width: 40px;
    height: 40px;
}

.company-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2c3e50;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #3498db;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #3498db;
}

.language-switcher {
    display: flex;
    gap: 5px;
    margin-left: 20px;
}

.lang-btn {
    padding: 5px 10px;
    border: 1px solid #ddd;
    background: #fff;
    cursor: pointer;
    border-radius: 3px;
    font-size: 0.8rem;
    transition: all 0.3s ease;
}

.lang-btn.active {
    background: #3498db;
    color: white;
    border-color: #3498db;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    transition: 0.3s;
}

/* ================================
   背景图片设置区域
   ================================ */

/* 首页主视觉区域 */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.3)), 
                url('../images/hero-bg.jpg') center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
    margin-top: 80px;
}

/* 服务预览区域背景 */
.services-preview {
    padding: 80px 0;
    background: linear-gradient(rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.85)), 
                url('../images/services-preview-bg.jpg') center/cover no-repeat fixed;
}

/* 关于预览区域背景 */
.about-preview {
    padding: 80px 0;
    background: linear-gradient(rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.85)), 
                url('../images/about-preview-bg.jpg') center/cover no-repeat fixed;
}

/* 页面头部通用样式 - 所有页面共用 */
.page-header {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.8), rgba(118, 75, 162, 0.8)), 
                url('../images/header-bg.jpg') center/cover no-repeat;
    color: white;
    text-align: center;
    padding: 120px 0 80px;
    margin-top: 80px;
}

/* 业务范围页面背景 */
.services-detail {
    padding: 80px 0;
    background: linear-gradient(rgba(248, 249, 250, 0.9), rgba(248, 249, 250, 0.9)), 
                url('../images/services-bg.jpg') center/cover no-repeat fixed;
}

/* 关于我们页面背景 */
.about-detail {
    padding: 80px 0;
    background: linear-gradient(rgba(248, 249, 250, 0.9), rgba(248, 249, 250, 0.9)), 
                url('../images/about-bg.jpg') center/cover no-repeat fixed;
}

/* 联系我们页面背景 */
.contact-content {
    padding: 80px 0;
    background: linear-gradient(rgba(248, 249, 250, 0.9), rgba(248, 249, 250, 0.9)), 
                url('../images/contact-bg.jpg') center/cover no-repeat fixed;
}

.map-section {
    padding: 80px 0;
    background: linear-gradient(rgba(248, 249, 250, 0.9), rgba(248, 249, 250, 0.9)), 
                url('../images/contact-bg.jpg') center/cover no-repeat fixed;
}

/* CTA区域背景 */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.8), rgba(118, 75, 162, 0.8)), 
                url('../images/cta-bg.jpg') center/cover no-repeat;
    color: white;
    text-align: center;
}

/* ================================
   内容样式区域
   ================================ */

.hero-content {
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    padding: 15px 30px;
    background: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid #3498db;
}

.cta-button:hover {
    background: transparent;
    color: #3498db;
}

.secondary-button {
    display: inline-block;
    padding: 12px 25px;
    background: transparent;
    color: #3498db;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid #3498db;
}

.secondary-button:hover {
    background: #3498db;
    color: white;
}

/* 通用部分样式 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2c3e50;
}

/* 服务预览区域内容 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.service-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

/* 关于预览区域内容 */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #666;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* 业务范围页面内容 */
.service-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
    margin-bottom: 100px;
}

.service-item.reverse {
    direction: rtl;
}

.service-item.reverse > * {
    direction: ltr;
}

.service-image img {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.service-content h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.service-content p {
    font-size: 1.1rem;
    margin-bottom: 25px;
    color: #666;
    line-height: 1.8;
}

.service-examples {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
}

.service-examples li {
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    border-left: 4px solid #3498db;
    transition: transform 0.2s ease;
}

.service-examples li:hover {
    transform: translateX(5px);
}

/* 关于我们页面内容 */
.about-intro {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 50px;
    margin-bottom: 80px;
    align-items: start;
}

.about-text h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #666;
    line-height: 1.8;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.value-item {
    padding: 30px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s ease;
    backdrop-filter: blur(10px);
}

.value-item:hover {
    transform: translateY(-5px);
}

.value-item h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.why-choose-us {
    margin-bottom: 80px;
    text-align: center;
}

.why-choose-us h2 {
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2c3e50;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.advantage {
    text-align: center;
    padding: 40px 20px;
}

.advantage-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.advantage h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.company-info {
    text-align: center;
}

.company-info h2 {
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2c3e50;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.info-item {
    text-align: center;
    padding: 30px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(10px);
}

.info-item h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: #3498db;
}

/* 联系我们页面内容 */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info h2 {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.contact-info > p {
    font-size: 1.1rem;
    margin-bottom: 40px;
    color: #666;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.contact-icon {
    font-size: 2rem;
    margin-top: 5px;
}

.contact-item h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
    color: #2c3e50;
}

.contact-form {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
}

.contact-form h2 {
    font-size: 2.2rem;
    margin-bottom: 30px;
    color: #2c3e50;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.submit-button {
    width: 100%;
    padding: 15px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.submit-button:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.map-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #2c3e50;
}

.map-placeholder {
    background: rgba(255, 255, 255, 0.95);
    padding: 60px 40px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
}

.map-content h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.map-content > p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #666;
}

.map-directions h4 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.map-directions ul {
    list-style: none;
    text-align: left;
    max-width: 300px;
    margin: 0 auto;
}

.map-directions li {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}

/* CTA区域内容 */
.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.cta-section p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-section .cta-button {
    background: white;
    color: #667eea;
    border-color: white;
}

.cta-section .cta-button:hover {
    background: transparent;
    color: white;
}

/* 页脚样式 */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.footer-logo img {
    width: 40px;
    height: 40px;
}

.footer-logo span {
    font-size: 1.3rem;
    font-weight: 700;
}

.footer-info p {
    opacity: 0.8;
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #3498db;
}

.footer-section a {
    display: block;
    color: #ddd;
    text-decoration: none;
    margin-bottom: 10px;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: #3498db;
}

.footer-section p {
    margin-bottom: 10px;
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 20px;
    text-align: center;
    opacity: 0.7;
}

/* 语言切换过渡效果 */
[data-translate] {
    transition: opacity 0.3s ease;
}

.translating {
    opacity: 0.7 !important;
}

/* 表单错误样式 */
.field-error {
    color: #e74c3c;
    font-size: 0.8rem;
    margin-top: 5px;
}

input.error, select.error, textarea.error {
    border-color: #e74c3c !important;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.back-to-top:hover {
    background: #2980b9;
    transform: scale(1.1);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    /* 移动端取消固定背景 */
    .services-preview,
    .about-preview,
    .services-detail,
    .about-detail,
    .contact-content,
    .map-section {
        background-attachment: scroll !important;
    }
    
    .nav-container {
        padding: 0 15px;
        height: 70px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 50px;
        gap: 30px;
        transition: left 0.3s ease;
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .language-switcher {
        margin-left: 0;
        margin-top: 20px;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .about-content,
    .about-intro {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .service-item {
        grid-template-columns: 1fr;
        gap: 30px;
        margin-bottom: 60px;
    }
    
    .service-item.reverse {
        direction: ltr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .page-header {
        padding: 100px 0 60px;
    }
    
    .page-header h1 {
        font-size: 2.2rem;
    }
    
    .services-preview,
    .about-preview,
    .services-detail,
    .about-detail,
    .contact-content {
        padding: 50px 0;
    }
    
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .company-name {
        font-size: 1.2rem;
    }
    
    .hero {
        height: 70vh;
        margin-top: 70px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .service-card {
        padding: 30px 20px;
    }
    
    .contact-form {
        padding: 30px 20px;
    }
    
    .map-placeholder {
        padding: 40px 20px;
    }
    
    .cta-section h2 {
        font-size: 2rem;
    }
    
    .footer {
        padding: 40px 0 20px;
    }
    
    .values-grid,
    .advantages-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }
}