/* 全局变量 */
:root {
  --primary-color: #1E40AF; /* 蓝色 - 科技感 */
  --secondary-color: #10B981; /* 绿色 - 学术、成长 */
  --accent-color: #8B5CF6; /* 紫色 - 创新 */
  --light-color: #F9FAFB;
  --dark-color: #1F2937;
  --gray-color: #6B7280;
  --light-gray: #E5E7EB;
  --white: #FFFFFF;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --transition: all 0.3s ease;
}

/* 基础重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--dark-color);
  background-color: var(--white);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  text-align: center;
}

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

.btn-primary:hover {
  background-color: #1e3a8a;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--light-color);
  color: var(--dark-color);
  border: 1px solid var(--light-gray);
}

.btn-secondary:hover {
  background-color: var(--light-gray);
  transform: translateY(-2px);
}

/* 头部样式 */
.header {
  background-color: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 20px;
}

.logo img {
  height: 40px;
}

.nav ul {
  display: flex;
  list-style: none;
}

.nav ul li {
  margin-left: 2rem;
}

.nav ul li a {
  text-decoration: none;
  color: var(--dark-color);
  font-weight: 500;
  transition: var(--transition);
  padding: 0.5rem 1rem;
  border-radius: 6px;
}

.nav ul li a:hover,
.nav ul li a.active {
  color: var(--primary-color);
  background-color: rgba(30, 64, 175, 0.1);
}


.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}
/* 首页英雄区域 */
.hero {
  padding: 4rem 0;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.hero-content {
  flex: 1;
}

.hero-content h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--dark-color);
  line-height: 1.2;
}

.hero-content .subtitle {
  font-size: 1.5rem;
  color: var(--gray-color);
  margin-bottom: 1rem;
}

.hero-content .slogan {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 2rem;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
}

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

.hero-image img {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

/* 核心功能区域 */
.features {
  padding: 5rem 0;
  background-color: var(--white);
}

.features .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background-color: var(--light-color);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

/* 应用场景 */
.use-cases {
  padding: 5rem 0;
  background-color: #f8fafc;
}

.use-cases .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.use-case-card {
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
}

.use-case-card:hover {
  transform: translateY(-5px);
}

.use-case-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--secondary-color);
}

/* 用户评价 */
.testimonials {
  padding: 5rem 0;
  background-color: var(--white);
}

.testimonials .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.testimonial-card {
  background-color: var(--light-color);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary-color);
}

.testimonial-card p {
  font-style: italic;
  margin-bottom: 1rem;
}

.testimonial-card .author {
  font-weight: 600;
  text-align: right;
  color: var(--gray-color);
}

/* 合作机构 */
.partners {
  padding: 5rem 0;
  background-color: #f8fafc;
}

.partners .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.partners-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 3rem;
}

.partners-logos img {
  max-height: 80px;
  opacity: 0.7;
  transition: var(--transition);
}

.partners-logos img:hover {
  opacity: 1;
  transform: scale(1.05);
}

.partner-logo {
  padding: 1rem 2rem;
  background-color: var(--white);
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark-color);
  opacity: 0.8;
  transition: var(--transition);
  text-align: center;
  min-width: 150px;
}

.partner-logo:hover {
  opacity: 1;
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-color);
}

.partner-logo-img {
  height: 60px;
  width: auto;
  padding: 0.5rem 1rem;
  background-color: var(--white);
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  opacity: 0.8;
  transition: var(--transition);
  object-fit: contain;
}

.partner-logo-img:hover {
  opacity: 1;
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-color);
}

/* 页脚 */
.footer {
  background-color: var(--dark-color);
  color: var(--white);
  padding: 3rem 0 1rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.footer-logo img {
  height: 50px;
  margin-bottom: 1rem;
}

.footer-logo p {
  color: var(--light-gray);
  max-width: 300px;
}

.footer-links {
  display: flex;
  gap: 3rem;
}

.footer-column h4 {
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.footer-column ul {
  list-style: none;
}

.footer-column ul li {
  margin-bottom: 0.5rem;
}

.footer-column ul li a {
  color: var(--light-gray);
  text-decoration: none;
  transition: var(--transition);
}

.footer-column ul li a:hover {
  color: var(--white);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--light-gray);
}

/* 产品功能页 */
.features-hero {
  padding: 4rem 0;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  text-align: center;
}

.features-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.features-hero p {
  font-size: 1.25rem;
  color: var(--gray-color);
}

.features-nav {
  margin: 2rem 0;
}

.features-nav ul {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: 1rem;
  justify-content: center;
}

.features-nav ul li a {
  display: block;
  padding: 0.75rem 1.5rem;
  background-color: var(--light-color);
  border-radius: 30px;
  text-decoration: none;
  color: var(--dark-color);
  transition: var(--transition);
}

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

.feature-section {
  display: none;
  padding: 2rem 0;
}

.feature-section.active {
  display: block;
}

.feature-details {
  display: flex;
  align-items: center;
  gap: 3rem;
  margin-top: 2rem;
}

.feature-description {
  flex: 1;
}

.feature-description h3 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.feature-description ul {
  margin: 1.5rem 0;
  padding-left: 1.5rem;
}

.feature-description ul li {
  margin-bottom: 0.75rem;
}

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

.feature-image img {
  max-width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

/* 解决方案页 */
.solutions-hero {
  padding: 4rem 0;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  text-align: center;
}

.solutions-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.solutions-hero p {
  font-size: 1.25rem;
  color: var(--gray-color);
}

.user-segments {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.segment-card {
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.segment-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.segment-card h2 {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
  text-align: center;
}

.segment-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.segment-card ul {
  margin: 1.5rem 0;
  padding-left: 1.5rem;
}

.segment-card ul li {
  margin-bottom: 0.75rem;
}

.industry-applications {
  padding: 5rem 0;
  background-color: #f8fafc;
}

.industry-applications .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.industry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.industry-card {
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.industry-card:hover {
  transform: translateY(-5px);
}

.industry-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--secondary-color);
}

.industry-card ul {
  margin: 1.5rem 0;
  padding-left: 1.5rem;
}

.industry-card ul li {
  margin-bottom: 0.75rem;
}

/* 关于我们页 */
.about-hero {
  padding: 4rem 0;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  text-align: center;
}

.about-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.about-hero p {
  font-size: 1.25rem;
  color: var(--gray-color);
}

.mission-vision {
  padding: 5rem 0;
}

.mission-vision-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

.mission,
.vision {
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.mission {
  background-color: #eff6ff;
  border-left: 4px solid var(--primary-color);
}

.vision {
  background-color: #ecfdf5;
  border-left: 4px solid var(--secondary-color);
}

.mission h2,
.vision h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--dark-color);
}

.team {
  padding: 5rem 0;
  background-color: #f8fafc;
}

.team .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.team-members {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

.team-member {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
}

.member-photo img {
  border-radius: 50%;
  margin-bottom: 1.5rem;
}

.member-info h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--dark-color);
}

.member-info .position {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 1rem;
}

.advisors {
  padding: 5rem 0;
}

.advisor-members {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

.advisor-member {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
}

.timeline {
  padding: 5rem 0;
  background-color: #f8fafc;
}

.timeline .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

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

.timeline-content::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--primary-color);
  left: 50%;
  margin-left: -2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 50px;
  width: 100%;
}

.timeline-item:nth-child(odd) {
  padding-right: calc(50% + 30px);
  text-align: right;
}

.timeline-item:nth-child(even) {
  padding-left: calc(50% + 30px);
}

.timeline-date {
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.timeline-text {
  background-color: var(--white);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.values {
  padding: 5rem 0;
}

.values .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.value-card {
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
}

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

.value-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

/* 帮助中心页 */
.help-hero {
  padding: 4rem 0;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  text-align: center;
}

.help-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.help-hero p {
  font-size: 1.25rem;
  color: var(--gray-color);
}

.faq-search {
  padding: 3rem 0;
}

.search-box {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
}

.search-box input {
  flex: 1;
  padding: 1rem;
  border: 1px solid var(--light-gray);
  border-radius: 6px 0 0 6px;
  font-size: 1rem;
}

.search-box button {
  padding: 1rem 1.5rem;
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  border-radius: 0 6px 6px 0;
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition);
}

.search-box button:hover {
  background-color: #1e3a8a;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.category-card {
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
}

.category-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
}

.category-card ul {
  list-style: none;
}

.category-card ul li {
  margin-bottom: 0.75rem;
}

.category-card ul li a {
  color: var(--dark-color);
  text-decoration: none;
  transition: var(--transition);
}

.category-card ul li a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

.popular-faq {
  padding: 5rem 0;
  background-color: #f8fafc;
}

.popular-faq .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

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

.faq-item {
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.faq-item h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.support-contact {
  padding: 5rem 0;
}

.support-contact .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.support-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.support-option {
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.support-option h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

/* 联系我们页 */
.contact-hero {
  padding: 4rem 0;
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  text-align: center;
}

.contact-hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: var(--dark-color);
}

.contact-hero p {
  font-size: 1.25rem;
  color: var(--gray-color);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.contact-card {
  background-color: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.contact-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.contact-form {
  padding: 5rem 0;
  background-color: #f8fafc;
}

.contact-form .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.contact-form-content {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--dark-color);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--light-gray);
  border-radius: 6px;
  font-family: inherit;
  font-size: 1rem;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
}

.checkbox-group input {
  width: auto;
  margin-right: 0.75rem;
  margin-top: 0.25rem;
}

.social-media {
  padding: 5rem 0;
}

.social-media .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.social-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.social-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  color: var(--dark-color);
  transition: var(--transition);
}

.social-link:hover {
  transform: translateY(-5px);
}

.social-link img {
  width: 50px;
  height: 50px;
  margin-bottom: 0.5rem;
  border-radius: 50%;
}

.office-address {
  padding: 5rem 0;
  background-color: #f8fafc;
}

.office-address .container h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--dark-color);
}

.address-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
  align-items: center;
}

.address-info h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.map-container img {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .hero .container {
    flex-direction: column;
  }
  
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .hero-content .subtitle {
    font-size: 1.25rem;
  }
  
  .feature-details {
    flex-direction: column;
  }
  
  .footer-content {
    flex-direction: column;
    gap: 2rem;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .address-content {
    grid-template-columns: 1fr;
  }
  
  .nav ul {
    display: none;
  }
  
  .timeline-content::before {
    left: 30px;
  }
  
  .timeline-item {
    padding-right: 0 !important;
    padding-left: 70px !important;
    text-align: left !important;
  }
}

/* 语言切换按钮 */
.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background-color: var(--white);
  color: var(--primary-color);
  border: 1.5px solid var(--primary-color);
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  cursor: pointer;
}

.language-switch::before {
  content: '🌐';
  font-size: 1rem;
}

.language-switch:hover {
  background-color: var(--primary-color);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(30, 64, 175, 0.2);
}

.language-switch:active {
  transform: translateY(0);
}