/* 基础样式设置 */
:root {
    /* 颜色变量 */
    --primary-color: #1e88e5;
    --primary-dark: #1565c0;
    --primary-light: #64b5f6;
    --accent-color: #ff6d00;
    --accent-dark: #e65100;
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-light: #ffffff;
    --bg-light: #ffffff;
    --bg-gray: #f5f7fa;
    --bg-dark: #1c2331;
    --border-color: #e0e0e0;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    
    /* 间距变量 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* 边框圆角 */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    
    /* 过渡动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 容器最大宽度 */
    --container-width: 1200px;
    --container-padding: 24px;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-light);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

ul, ol {
    list-style: none;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

/* 容器 */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* 通用按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-light);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: var(--text-light);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--text-light);
}

.btn-text {
    background-color: transparent;
    color: var(--primary-color);
    padding: 0;
    font-weight: 500;
    text-decoration: none;
}

.btn-text:hover {
    color: var(--primary-dark);
}

.btn-text .arrow {
    display: inline-block;
    margin-left: 4px;
    transition: transform var(--transition-fast);
}

.btn-text:hover .arrow {
    transform: translateX(4px);
}

.full-width {
    width: 100%;
}

/* 通用标题样式 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5em;
    color: var(--text-primary);
}

/* 段落样式 */
p {
    margin-bottom: 1rem;
}

/* Section样式 */
section {
    padding: var(--spacing-xxl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-header p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.highlight {
    color: var(--primary-color);
}

/* Header样式 */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--bg-light);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.header-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo a {
    display: block;
}

.main-nav .nav-list {
    display: flex;
    gap: var(--spacing-lg);
}

.main-nav .nav-list a {
    color: var(--text-primary);
    font-weight: 500;
    position: relative;
    padding: 8px 0;
}

.main-nav .nav-list a:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width var(--transition-normal);
}

.main-nav .nav-list a:hover:after,
.main-nav .nav-list a.active:after {
    width: 100%;
}

.main-nav .nav-list a.active {
    color: var(--primary-color);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 30px;
    height: 25px;
    position: relative;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background-color: var(--text-primary);
    position: absolute;
    transition: all var(--transition-fast);
}

.menu-toggle span:nth-child(1) {
    top: 0;
}

.menu-toggle span:nth-child(2) {
    top: 50%;
    transform: translateY(-50%);
}

.menu-toggle span:nth-child(3) {
    bottom: 0;
}

/* Hero部分 */
.hero-section {
    padding-top: 160px;
    padding-bottom: var(--spacing-xxl);
    background-color: var(--bg-light);
    position: relative;
    overflow: hidden;
}

.hero-section .container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xl);
}

.hero-content {
    flex: 1;
}

.hero-image {
    flex: 1;
}

.hero-section h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-section .subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.hero-stats {
    margin-top: var(--spacing-xxl);
    background-color: var(--bg-gray);
    padding: var(--spacing-lg) 0;
}

.stats-grid {
    display: flex;
    justify-content: space-between;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-text {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* 优势部分 */
.advantages-section {
    background-color: var(--bg-gray);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.advantage-item {
    background-color: var(--bg-light);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-normal);
}

.advantage-item:hover {
    transform: translateY(-10px);
}

.advantage-icon {
    margin-bottom: var(--spacing-md);
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.advantage-item h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.advantage-item p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 0;
}

/* 产品服务部分 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.product-card {
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background-color: var(--bg-light);
    transition: transform var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-10px);
}

.product-image {
    overflow: hidden;
    height: 220px;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-content {
    padding: var(--spacing-lg);
}

.product-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.product-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* 解决方案部分 */
.solutions-section {
    background-color: var(--bg-gray);
}

.solutions-tabs {
    margin-top: var(--spacing-xl);
}

.tabs-nav {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    position: relative;
    transition: color var(--transition-fast);
}

.tab-btn:after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--primary-color);
    transition: width var(--transition-normal);
}

.tab-btn.active, .tab-btn:hover {
    color: var(--primary-color);
}

.tab-btn.active:after {
    width: 100%;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.solution-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    background-color: var(--bg-light);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.solution-info {
    flex: 1;
}

.solution-image {
    flex: 1;
}

.solution-info h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
}

.solution-info p {
    margin-bottom: var(--spacing-md);
}

.solution-features {
    margin-bottom: var(--spacing-lg);
}

.solution-features li {
    margin-bottom: var(--spacing-sm);
    position: relative;
    padding-left: 1.5rem;
}

.solution-features li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* 成功案例部分 */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.case-card {
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background-color: var(--bg-light);
    transition: all var(--transition-normal);
}

.case-card:hover {
    transform: translateY(-10px);
}

.case-image {
    height: 240px;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.case-card:hover .case-image img {
    transform: scale(1.05);
}

.case-content {
    padding: var(--spacing-lg);
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--primary-light);
    color: var(--text-light);
    border-radius: 20px;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.case-content h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.case-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.cases-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* 客户评价部分 */
.testimonial-section {
    background-color: var(--bg-light);
    position: relative;
}

.testimonial-slider {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.testimonial-item {
    display: none;
}

.testimonial-item.active {
    display: block;
}

.testimonial-content {
    background-color: var(--bg-gray);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-md);
    position: relative;
}

.quote-icon {
    position: absolute;
    top: -15px;
    left: 20px;
    font-size: 5rem;
    line-height: 1;
    color: var(--primary-light);
    opacity: 0.3;
}

.testimonial-content p {
    font-size: 1.1rem;
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.testimonial-author img {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.author-info h4 {
    margin-bottom: 0;
}

.author-info span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.testimonial-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.prev-btn, .next-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.prev-btn:hover, .next-btn:hover {
    color: var(--primary-color);
}

.testimonial-dots {
    display: flex;
    gap: var(--spacing-sm);
    margin: 0 var(--spacing-md);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--border-color);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.dot.active, .dot:hover {
    background-color: var(--primary-color);
}

/* 合作伙伴部分 */
.partners-section {
    background-color: var(--bg-gray);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-lg);
    align-items: center;
}

.partner-logo {
    display: flex;
    justify-content: center;
    align-items: center;
    filter: grayscale(100%);
    opacity: 0.7;
    transition: all var(--transition-normal);
}

.partner-logo:hover {
    filter: grayscale(0);
    opacity: 1;
}

/* 关于我们部分 */
.about-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.about-image {
    flex: 1;
}

.about-info {
    flex: 1;
}

.about-info h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
}

.about-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.value-item {
    text-align: center;
    background-color: var(--bg-gray);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.value-item h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.value-item p {
    margin-bottom: 0;
}

/* 联系我们部分 */
.contact-section {
    background-color: var(--bg-gray);
}

.contact-wrapper {
    display: flex;
    gap: var(--spacing-xl);
}

.contact-info, .contact-form {
    flex: 1;
    background-color: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.contact-info h3, .contact-form h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.contact-icon {
    background-color: var(--primary-light);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-text h4 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.contact-text p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

.social-media {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.social-media a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bg-gray);
    transition: all var(--transition-fast);
}

.social-media a:hover {
    background-color: var(--primary-color);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group.full-width {
    grid-column: span 2;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-light);
    transition: border-color var(--transition-fast);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 底部区域 */
.footer {
    background-color: var(--bg-dark);
    color: var(--text-light);
    padding-top: var(--spacing-xxl);
}

.footer-top {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    max-width: 300px;
}

.footer-logo p {
    margin-top: var(--spacing-md);
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xxl);
}

.footer-col h4 {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-col a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--text-light);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg) 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright, .icp {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.copyright a {
    color: rgba(255, 255, 255, 0.7);
}

.copyright a:hover {
    color: var(--text-light);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 99;
}

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

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
}

/* 表单布局 */
#contactForm {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}