/* 基础样式设置 */
:root {
  --primary-color: #3a6ea5;
  --secondary-color: #004e98;
  --accent-color: #ff6b6b;
  --light-color: #f8f9fa;
  --dark-color: #343a40;
  --text-color: #333;
  --gray-color: #6c757d;
  --light-gray: #e9ecef;
  --border-radius: 5px;
  --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "PingFang SC", "Helvetica Neue", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: #fff;
}

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

ul {
  list-style: none;
}

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

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

.section-title {
  font-size: 2.2rem;
  text-align: center;
  margin-bottom: 2rem;
  position: relative;
  color: var(--dark-color);
}

.section-title:after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background: var(--primary-color);
  margin: 10px auto 0;
}

.section-desc {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
  color: var(--gray-color);
}

.btn {
  display: inline-block;
  padding: 12px 25px;
  border-radius: var(--border-radius);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

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

.btn.primary:hover {
  background-color: var(--secondary-color);
  transform: translateY(-3px);
  box-shadow: var(--box-shadow);
}

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

.btn.secondary:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-3px);
}

.alt-bg {
  background-color: var(--light-color);
}

/* 头部导航 */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: white;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 15px 0;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h1 {
  font-size: 1.8rem;
  color: var(--primary-color);
  font-weight: 700;
}

nav ul {
  display: flex;
}

nav ul li {
  margin-left: 30px;
}

nav ul li a {
  color: var(--dark-color);
  font-weight: 500;
  padding: 5px 0;
  position: relative;
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--primary-color);
}

nav ul li a:after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: var(--transition);
}

nav ul li a:hover:after,
nav ul li a.active:after {
  width: 100%;
}

.contact-btn {
  background-color: var(--primary-color);
  color: white !important;
  padding: 8px 20px !important;
  border-radius: var(--border-radius);
}

.contact-btn:hover {
  background-color: var(--secondary-color);
  transform: translateY(-3px);
  box-shadow: var(--box-shadow);
}

.contact-btn:after {
  display: none;
}

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--dark-color);
}

/* 首页英雄区 */
.hero {
  padding: 80px 0;
  background-color: var(--light-color);
  overflow: hidden;
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hero-content {
  flex: 1;
  padding-right: 50px;
}

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: 15px;
  color: var(--dark-color);
  line-height: 1.2;
}

.hero-content h2 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--primary-color);
  font-weight: 500;
}

.hero-content p {
  font-size: 1.1rem;
  margin-bottom: 30px;
  color: var(--gray-color);
}

.hero-buttons {
  display: flex;
  gap: 15px;
}

.hero-image {
  flex: 1;
  position: relative;
}

.hero-image img {
  border-radius: 10px;
  box-shadow: var(--box-shadow);
}

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

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.service-card {
  background-color: white;
  border-radius: 10px;
  padding: 30px;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  text-align: center;
}

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

.service-icon {
  width: 70px;
  height: 70px;
  background-color: var(--light-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.service-icon i {
  font-size: 1.8rem;
  color: var(--primary-color);
}

.service-card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--dark-color);
}

.service-card p {
  color: var(--gray-color);
  margin-bottom: 20px;
}

.read-more {
  color: var(--primary-color);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
}

.read-more i {
  margin-left: 5px;
  transition: var(--transition);
}

.read-more:hover i {
  transform: translateX(5px);
}

/* 案例展示 */
.case-studies {
  padding: 80px 0;
  background-color: var(--light-color);
}

.case-slider {
  display: flex;
  overflow: hidden;
  margin-bottom: 20px;
}

.case {
  flex: 0 0 100%;
  padding: 0 15px;
  display: flex;
  flex-direction: column;
  background-color: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--box-shadow);
}

.case img {
  width: 100%;
  height: 250px;
  object-fit: cover;
}

.case-content {
  padding: 25px;
}

.case-content h3 {
  font-size: 1.3rem;
  margin-bottom: 15px;
  color: var(--dark-color);
}

.case-content p {
  color: var(--gray-color);
}

.slider-controls {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--light-gray);
  cursor: pointer;
  transition: var(--transition);
}

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

/* 客户评价 */
.testimonials {
  padding: 80px 0;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.testimonial {
  background-color: white;
  border-radius: 10px;
  padding: 30px;
  box-shadow: var(--box-shadow);
}

.quote {
  font-style: italic;
  margin-bottom: 20px;
  color: var(--gray-color);
  position: relative;
  padding-left: 20px;
}

.quote:before {
  content: '"';
  font-size: 3rem;
  color: var(--light-gray);
  position: absolute;
  left: -10px;
  top: -20px;
  opacity: 0.5;
}

.client {
  display: flex;
  align-items: center;
}

.client img {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  margin-right: 15px;
  object-fit: cover;
}

.client-info h4 {
  font-size: 1.1rem;
  color: var(--dark-color);
}

.client-info p {
  color: var(--gray-color);
  font-size: 0.9rem;
}

/* 联系我们 */
.contact {
  padding: 80px 0;
  background-color: var(--light-color);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 50px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.info-item {
  display: flex;
  align-items: flex-start;
}

.info-item i {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-right: 15px;
  margin-top: 5px;
}

.social-media {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

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

.social-media a:hover {
  background-color: var(--secondary-color);
  transform: translateY(-3px);
}

.contact-form {
  background-color: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: var(--box-shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--light-gray);
  border-radius: var(--border-radius);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

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

/* 页脚 */
footer {
  background-color: var(--dark-color);
  color: white;
  padding: 60px 0 20px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
}

.footer-logo h2 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.footer-logo p {
  color: rgba(255, 255, 255, 0.7);
}

.footer-links {
  display: flex;
  gap: 50px;
}

.link-group h3 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 10px;
}

.link-group h3:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background-color: var(--primary-color);
}

.link-group ul li {
  margin-bottom: 10px;
}

.link-group ul li a {
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition);
}

.link-group ul li a:hover {
  color: white;
  padding-left: 5px;
}

.copyright {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
}

/* 页面横幅 */
.page-banner {
  background-color: var(--primary-color);
  color: white;
  padding: 60px 0;
  text-align: center;
}

.page-banner h1 {
  font-size: 2.5rem;
  margin-bottom: 15px;
}

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

/* 服务详情页 */
.service-detail {
  padding: 80px 0;
}

.service-content {
  display: flex;
  align-items: center;
  gap: 50px;
}

.service-content.reverse {
  flex-direction: row-reverse;
}

.service-text {
  flex: 1;
}

.service-text h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--dark-color);
}

.service-text > p {
  margin-bottom: 30px;
  color: var(--gray-color);
}

.service-features {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.service-features li {
  display: flex;
  align-items: flex-start;
}

.service-features li i {
  color: var(--primary-color);
  font-size: 1.2rem;
  margin-right: 15px;
  margin-top: 5px;
}

.service-features li h3 {
  font-size: 1.2rem;
  margin-bottom: 5px;
  color: var(--dark-color);
}

.service-features li p {
  color: var(--gray-color);
}

.service-image {
  flex: 1;
}

.service-image img {
  border-radius: 10px;
  box-shadow: var(--box-shadow);
}

/* CTA区域 */
.cta {
  background-color: var(--primary-color);
  color: white;
  padding: 60px 0;
  text-align: center;
}

.cta h2 {
  font-size: 2rem;
  margin-bottom: 15px;
}

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

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

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

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

.about-content {
  display: flex;
  align-items: center;
  gap: 50px;
}

.about-text {
  flex: 1;
}

.about-text h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--dark-color);
}

.about-text p {
  margin-bottom: 20px;
  color: var(--gray-color);
}

.about-image {
  flex: 1;
}

.about-image img {
  border-radius: 10px;
  box-shadow: var(--box-shadow);
}

.mission-vision {
  padding: 80px 0;
}

.mv-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  text-align: center;
}

.mission, .vision, .values {
  background-color: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: var(--box-shadow);
}

.icon {
  width: 70px;
  height: 70px;
  background-color: var(--light-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.icon i {
  font-size: 1.8rem;
  color: var(--primary-color);
}

.mission h2, .vision h2, .values h2 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--dark-color);
}

.mission p, .vision p, .values p {
  color: var(--gray-color);
}

.team {
  padding: 80px 0;
}

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

.team-member {
  background-color: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--box-shadow);
  text-align: center;
  transition: var(--transition);
}

.team-member:hover {
  transform: translateY(-10px);
}

.member-photo {
  height: 250px;
  overflow: hidden;
}

.member-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.team-member:hover .member-photo img {
  transform: scale(1.05);
}

.team-member h3 {
  font-size: 1.3rem;
  margin: 20px 0 5px;
  color: var(--dark-color);
}

.position {
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: 10px;
}

.bio {
  padding: 0 20px 20px;
  color: var(--gray-color);
}

.milestones {
  padding: 80px 0;
}

.timeline {
  position: relative;
  padding-left: 60px;
  margin: 40px 0;
}

.timeline:before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  height: 100%;
  width: 2px;
  background-color: var(--primary-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 50px;
  display: flex;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.year {
  position: absolute;
  left: -130px;
  width: 80px;
  text-align: right;
  font-weight: 700;
  color: var(--primary-color);
  font-size: 1.2rem;
}

.event {
  flex: 1;
  background-color: white;
  padding: 25px;
  border-radius: 10px;
  box-shadow: var(--box-shadow);
  position: relative;
}

.event:before {
  content: '';
  position: absolute;
  left: -34px;
  top: 20px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--primary-color);
  border: 5px solid white;
  box-shadow: 0 0 0 2px var(--primary-color);
}

/* 为两个项目的时间线添加特殊样式 */
.timeline-item:first-child .event:after {
  content: '';
  position: absolute;
  top: 100%;
  left: 20px;
  height: 30px;
  width: 2px;
  background-color: var(--primary-color);
}

.timeline-item:last-child {
  margin-top: 30px;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .timeline {
    padding-left: 40px;
  }
  
  .year {
    left: -40px;
    width: 60px;
    font-size: 1rem;
  }
  
  .event {
    padding: 20px;
  }
  
  .event:before {
    left: -25px;
    width: 15px;
    height: 15px;
  }
}

/* 响应式设计 */
@media (max-width: 992px) {
  .hero-content h1 {
    font-size: 2.5rem;
  }
  
  .hero-content h2 {
    font-size: 1.5rem;
  }
  
  .service-content, 
  .about-content {
    flex-direction: column;
  }
  
  .service-content.reverse {
    flex-direction: column;
  }
  
  .contact-wrapper {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  nav {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 80%;
    height: calc(100vh - 70px);
    background-color: white;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    z-index: 1000;
  }
  
  nav.active {
    left: 0;
  }
  
  nav ul {
    flex-direction: column;
    padding: 30px;
  }
  
  nav ul li {
    margin: 0 0 20px 0;
  }
  
  .hero .container {
    flex-direction: column;
  }
  
  .hero-content {
    padding-right: 0;
    margin-bottom: 50px;
    text-align: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 30px;
  }
}

@media (max-width: 576px) {
  .section-title {
    font-size: 1.8rem;
  }
  
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .hero-content h2 {
    font-size: 1.3rem;
  }
}

/* 合作伙伴 */
.partners {
  padding: 80px 0;
}

.partner-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-top: 30px;
}

.partner-logo {
  flex: 0 0 200px;
  height: 120px;
  background-color: white;
  border-radius: 10px;
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 15px;
  transition: var(--transition);
  text-align: center;
}

.partner-logo:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.partner-logo svg {
  width: 100%;
  height: 80px;
  margin-bottom: 10px;
}

.partner-logo span {
  font-weight: 600;
  color: var(--dark-color);
  font-size: 1.1rem;
}

@media (max-width: 768px) {
  .partner-logos {
    gap: 20px;
  }
  
  .partner-logo {
    flex: 0 0 160px;
    height: 110px;
  }
  
  .partner-logo span {
    font-size: 1rem;
  }
}

@media (max-width: 576px) {
  .partner-logo {
    flex: 0 0 140px;
    height: 100px;
  }
}