/* 重置和基本设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #10b981;
    --text-color: #333;
    --text-light: #666;
    --text-lighter: #999;
    --bg-color: #fff;
    --bg-light: #f8fafc;
    --bg-dark: #1e293b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-size: 16px;
}

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

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

ul {
    list-style: none;
}

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

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

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

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

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

.btn-light {
    background-color: white;
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-small {
    padding: 8px 16px;
    font-size: 14px;
}

/* 顶部通知栏 */
.top-bar {
    background-color: var(--bg-dark);
    color: white;
    padding: 8px 0;
    font-size: 14px;
}

.top-bar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-contact {
    display: flex;
    align-items: center;
    gap: 16px;
}

.top-contact span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.top-contact .sep {
    color: var(--text-lighter);
}

.social-icons {
    display: flex;
    gap: 12px;
}

.social-icons a {
    color: white;
    font-size: 18px;
    opacity: 0.8;
}

.social-icons a:hover {
    opacity: 1;
    transform: translateY(-2px);
}

/* 导航栏 */
.main-header {
    background-color: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary-color);
}

.logo-icon {
    font-size: 32px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-size: 24px;
    font-weight: 700;
}

.logo-sub {
    font-size: 12px;
    opacity: 0.7;
}

.nav-menu {
    display: flex;
    gap: 24px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-color);
}

.nav-link:hover,
.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-color);
    transition: var(--transition);
}

/* 页面标题 */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-title {
    font-size: 36px;
    margin-bottom: 16px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb a {
    color: rgba(255,255,255,0.8);
}

.breadcrumb a:hover {
    color: white;
}

/* 首页主图区域 */
.hero-section {
    padding: 80px 0;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.hero-section .container {
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--text-color);
}

.hero-subtitle {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 16px;
    font-weight: 500;
}

.hero-description {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
}

/* 公司优势 */
.advantages-section {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 36px;
    margin-bottom: 12px;
    color: var(--text-color);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.advantage-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.advantage-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.advantage-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.advantage-card p {
    color: var(--text-light);
}

/* 服务预览 */
.services-preview {
    padding: 80px 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.service-preview-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.service-preview-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.service-icon {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.service-preview-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.service-preview-card p {
    color: var(--text-light);
    margin-bottom: 20px;
    font-size: 14px;
}

.service-link {
    color: var(--primary-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.service-link:hover {
    color: var(--primary-dark);
    gap: 10px;
}

/* 案例预览 */
.portfolio-preview {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin-bottom: 48px;
}

.portfolio-item {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.portfolio-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.portfolio-image {
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder {
    width: 80px;
    height: 80px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
}

.portfolio-content {
    padding: 24px;
}

.portfolio-content h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.portfolio-content p {
    color: var(--text-light);
    margin-bottom: 12px;
    font-size: 14px;
}

.portfolio-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}

/* 联系我们CTA */
.contact-cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-align: center;
}

.cta-title {
    font-size: 36px;
    margin-bottom: 16px;
}

.cta-text {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 页脚 */
.main-footer {
    background-color: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

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

.footer-title {
    font-size: 18px;
    margin-bottom: 20px;
    color: white;
}

.footer-description {
    color: rgba(255,255,255,0.7);
    margin-bottom: 20px;
    line-height: 1.6;
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    color: rgba(255,255,255,0.7);
}

.footer-menu li {
    margin-bottom: 10px;
}

.footer-menu a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.7);
}

.footer-menu a:hover {
    color: white;
    padding-left: 4px;
}

.wechat-qr {
    text-align: center;
}

.qr-placeholder {
    width: 120px;
    height: 120px;
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    font-size: 48px;
    color: rgba(255,255,255,0.5);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.copyright {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
}

.copyright .sep {
    margin: 0 12px;
    opacity: 0.5;
}

.copyright a:hover {
    color: white;
}

.icp {
    color: rgba(255,255,255,0.7);
    font-size: 14px;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

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

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-4px);
}

/* 关于我们页面特定样式 */
.about-intro {
    padding: 80px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 36px;
    margin-bottom: 24px;
    color: var(--text-color);
}

.about-text p {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 18px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.stat-item {
    text-align: center;
    padding: 24px;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-light);
    font-size: 14px;
}

.culture-section {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.culture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.culture-item {
    background: white;
    padding: 40px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.culture-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.culture-item h3 {
    font-size: 24px;
    margin-bottom: 16px;
}

.culture-item p {
    color: var(--text-light);
    line-height: 1.6;
}

.timeline-section {
    padding: 80px 0;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 50px;
    top: 0;
    bottom: 0;
    width: 2px;
    background-color: var(--border-color);
}

.timeline-item {
    display: flex;
    margin-bottom: 40px;
    position: relative;
}

.timeline-year {
    width: 100px;
    text-align: right;
    padding-right: 30px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.timeline-content {
    flex: 1;
    padding-left: 30px;
}

.timeline-content h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.timeline-content p {
    color: var(--text-light);
    line-height: 1.6;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 46px;
    top: 8px;
    width: 12px;
    height: 12px;
    background-color: var(--primary-color);
    border-radius: 50%;
}

.team-section {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.team-member {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.member-avatar {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 40px;
}

.team-member h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.member-title {
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 12px;
}

.member-desc {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
}

/* 服务页面特定样式 */
.services-nav {
    padding: 40px 0;
    background-color: var(--bg-light);
}

.services-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.service-tab {
    padding: 12px 24px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

.service-tab:hover,
.service-tab.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.service-detail {
    padding: 80px 0;
}

.service-detail:nth-child(even) {
    background-color: var(--bg-light);
}

.service-header {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 40px;
}

.service-icon-large {
    font-size: 64px;
    color: var(--primary-color);
}

.service-title-content h2 {
    font-size: 36px;
    margin-bottom: 8px;
    color: var(--text-color);
}

.service-subtitle {
    font-size: 18px;
    color: var(--text-light);
}

.service-description {
    font-size: 18px;
    color: var(--text-color);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 800px;
}

.service-features h3 {
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--text-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.feature-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.feature-item i {
    color: var(--primary-color);
    font-size: 20px;
}

.technology-stack h3 {
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--text-color);
}

.tech-tags {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.tech-tag {
    padding: 8px 16px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
    transition: var(--transition);
}

.tech-tag:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.service-process {
    padding: 80px 0;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.process-step {
    text-align: center;
    padding: 32px 24px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.step-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
    opacity: 0.2;
}

.process-step h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text-color);
}

.process-step p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.5;
}

/* 案例页面特定样式 */
.portfolio-filter {
    padding: 40px 0;
    background-color: var(--bg-light);
}

.filter-tabs {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: 12px 24px;
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-color);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.portfolio-showcase {
    padding: 80px 0;
}

.portfolio-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 32px;
}

.portfolio-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.portfolio-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.portfolio-image {
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.portfolio-info {
    padding: 24px;
}

.portfolio-category {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 16px;
}

.portfolio-info h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-color);
}

.portfolio-description {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
}

.portfolio-tech {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.portfolio-tech span {
    padding: 4px 12px;
    background-color: var(--bg-light);
    border-radius: 20px;
    font-size: 12px;
    color: var(--text-light);
}

.portfolio-link {
    color: var(--primary-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.portfolio-link:hover {
    color: var(--primary-dark);
    gap: 10px;
}

/* 联系我们页面特定样式 */
.contact-info {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.contact-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.contact-card h3 {
    font-size: 20px;
    margin-bottom: 16px;
    color: var(--text-color);
}

.contact-card p {
    color: var(--text-light);
    margin-bottom: 8px;
    font-size: 14px;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    color: var(--primary-color);
    font-weight: 500;
}

.contact-link:hover {
    color: var(--primary-dark);
    gap: 10px;
}

.contact-form-section {
    padding: 80px 0;
}

.contact-form-wrapper {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 48px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-header {
    text-align: center;
    margin-bottom: 40px;
}

.form-header h2 {
    font-size: 32px;
    margin-bottom: 12px;
    color: var(--text-color);
}

.form-header p {
    color: var(--text-light);
    font-size: 16px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.form-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group label i {
    color: var(--primary-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-submit {
    margin-top: 16px;
}

.form-notice {
    text-align: center;
    color: var(--text-light);
    font-size: 14px;
}

.form-notice a {
    color: var(--primary-color);
    text-decoration: underline;
}

.faq-section {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    font-size: 18px;
    font-weight: 500;
    color: var(--text-color);
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
}

.faq-question:hover {
    background-color: var(--bg-light);
}

.faq-question i {
    transition: var(--transition);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active .faq-answer {
    padding: 0 24px 24px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 992px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 576px) {
    .services-grid {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 1024px) {
    .hero-title {
        font-size: 40px;
    }
    
    .section-title {
        font-size: 32px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .top-bar-content {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-section .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .portfolio-items {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .btn-large {
        padding: 14px 24px;
        font-size: 16px;
    }
    
    .services-tabs,
    .filter-tabs {
        flex-direction: column;
        width: 100%;
    }
    
    .service-tab,
    .filter-btn {
        width: 100%;
        text-align: center;
    }
    
    .contact-form-wrapper {
        padding: 24px;
    }
}