:root {
  --primary: #1e3a5f;
  --secondary: #3b82f6;
  --accent: #10b981;
  --bg-white: #ffffff;
  --bg-light: #f8fafc;
  --text-dark: #1f2937;
  --text-gray: #6b7280;
  --text-light: #9ca3af;
  --border: #e5e7eb;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
  --max-width: 1280px;
}

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

body {
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  background-color: var(--bg-white);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

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

ul {
  list-style: none;
}

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

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  border-radius: 0.5rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-size: 1rem;
}

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

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

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

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

.section {
  padding: 5rem 0;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 1rem;
  color: var(--primary);
}

.section-subtitle {
  text-align: center;
  color: var(--text-gray);
  font-size: 1.125rem;
  margin-bottom: 3rem;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: var(--transition);
  box-shadow: none;
}

.header.active {
  box-shadow: var(--shadow);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.25rem;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

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

.nav-list {
  display: flex;
  gap: 2.5rem;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-weight: 500;
  color: var(--text-dark);
  position: relative;
  padding: 0.5rem 0;
  display: block;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--secondary);
  transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link:hover,
.nav-link.active {
  color: var(--secondary);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
}

.mobile-menu-btn span {
  width: 25px;
  height: 3px;
  background-color: var(--primary);
  transition: var(--transition);
}

.footer {
  background-color: var(--primary);
  color: white;
  padding: 3rem 0 1.5rem;
}

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

.footer-section h3 {
  font-size: 1.125rem;
  margin-bottom: 1rem;
  color: white;
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.875rem;
  line-height: 2;
}

.footer-section a:hover {
  color: var(--accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--primary) 0%, #2d5a87 100%);
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?w=1920&h=1080&fit=crop');
  background-size: cover;
  background-position: center;
  opacity: 0.15;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: white;
  max-width: 900px;
  margin: 0 auto;
  animation: fadeInUp 1s ease;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in {
  animation: fadeInUp 0.8s ease forwards;
  opacity: 0;
}

.card {
  background: white;
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.grid {
  display: grid;
  gap: 2rem;
}

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

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.value-card {
  text-align: center;
  padding: 2.5rem 2rem;
}

.value-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
}

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

.value-card p {
  color: var(--text-gray);
  line-height: 1.8;
}

.service-card {
  position: relative;
  overflow: hidden;
  padding: 0;
}

.service-card .service-img {
  width: 100%;
  height: 200px;
  background-size: cover;
  background-position: center;
  border-radius: 1rem 1rem 0 0;
}

.service-card .service-icon {
  width: 60px;
  height: 60px;
  background: var(--bg-light);
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin: -2rem 2rem 1.5rem;
  position: relative;
  z-index: 1;
}

.service-card h3 {
  font-size: 1.25rem;
  margin: 0 2rem 1rem;
  color: var(--primary);
}

.service-card p {
  color: var(--text-gray);
  font-size: 0.9375rem;
  padding: 0 2rem 2rem;
  margin: 0;
}

.page-header {
  background: linear-gradient(135deg, var(--primary) 0%, #2d5a87 100%);
  color: white;
  padding: 8rem 0 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.page-header h1 {
  position: relative;
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.page-header p {
  position: relative;
  font-size: 1.125rem;
  opacity: 0.9;
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

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

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.25rem;
  width: 12px;
  height: 12px;
  background: var(--secondary);
  border-radius: 50%;
  transform: translateX(-5px);
}

.timeline-year {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 0.5rem;
}

.timeline-content h3 {
  font-size: 1.125rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

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

.timeline-alt {
  max-width: 1000px;
  margin: 0 auto;
}

.timeline-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
  align-items: center;
}

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

.timeline-card {
  background: white;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.timeline-card .timeline-year {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 1rem;
}

.timeline-card h3 {
  font-size: 1.375rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.timeline-card p {
  color: var(--text-gray);
  line-height: 1.8;
}

.timeline-image {
  height: 250px;
  background-size: cover;
  background-position: center;
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

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

.team-avatar {
  width: 120px;
  height: 120px;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: white;
  overflow: hidden;
}

.team-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-card h3 {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.team-card .position {
  color: var(--secondary);
  font-weight: 500;
  margin-bottom: 1rem;
}

.team-card p {
  color: var(--text-gray);
  font-size: 0.9375rem;
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.culture-card {
  text-align: center;
  padding: 2rem;
}

.culture-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  background: var(--bg-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  overflow: hidden;
}

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

.culture-card p {
  color: var(--text-gray);
}

.process-section {
  max-width: 1200px;
  margin: 3rem auto 0;
}

.process-flow {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  position: relative;
}

.process-flow::before {
  content: '';
  position: absolute;
  top: 50px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  z-index: 0;
}

.process-step {
  text-align: center;
  position: relative;
  z-index: 1;
  padding: 1rem;
}

.process-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto 1.5rem;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  color: white;
  font-weight: 700;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.process-step h3 {
  font-size: 1.125rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.process-step p {
  color: var(--text-gray);
  font-size: 0.875rem;
  line-height: 1.6;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.solution-card {
  background: white;
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.solution-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.solution-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.solution-card:hover::before {
  transform: scaleX(1);
}

.solution-card h3 {
  font-size: 1.375rem;
  color: var(--primary);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.solution-card h3::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--secondary);
  border-radius: 50%;
  display: inline-block;
}

.solution-card ul {
  padding-left: 0;
  list-style: none;
}

.solution-card li {
  color: var(--text-gray);
  margin-bottom: 0.75rem;
  padding-left: 1.75rem;
  position: relative;
  line-height: 1.6;
}

.solution-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.875rem;
}

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

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-icon {
  width: 50px;
  height: 50px;
  background: var(--bg-light);
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.contact-item h3 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.contact-item p {
  color: var(--text-gray);
  font-size: 0.9375rem;
}

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

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.form-error {
  color: #ef4444;
  font-size: 0.875rem;
  margin-top: 0.5rem;
  display: none;
}

.form-group.error input,
.form-group.error textarea {
  border-color: #ef4444;
}

.form-group.error .form-error {
  display: block;
}

.form-success {
  background: #d1fae5;
  color: #065f46;
  padding: 1rem;
  border-radius: 0.5rem;
  text-align: center;
  margin-bottom: 1.5rem;
  display: none;
}

.form-success.show {
  display: block;
}

.about-img {
  width: 100%;
  height: 300px;
  background-size: cover;
  background-position: center;
  border-radius: 1rem;
  margin-bottom: 2rem;
}

/* 首页新板块样式 */
.feature-card {
  padding: 0;
  overflow: hidden;
}

.feature-img {
  width: 100%;
  height: 220px;
  background-size: cover;
  background-position: center;
}

.feature-content {
  padding: 2rem;
}

.feature-content h3 {
  font-size: 1.375rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.feature-content p {
  color: var(--text-gray);
  line-height: 1.8;
}

.case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.case-card {
  background: white;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.case-img {
  width: 100%;
  height: 220px;
  background-size: cover;
  background-position: center;
}

.case-content {
  padding: 1.5rem;
}

.case-tag {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  color: white;
  border-radius: 2rem;
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.case-content h3 {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
}

.case-content p {
  color: var(--text-gray);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.tech-category {
  background: white;
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.tech-category:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.tech-category h3 {
  font-size: 1.125rem;
  color: var(--primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tech-tag {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--bg-light);
  border-radius: 2rem;
  font-size: 0.875rem;
  color: var(--text-dark);
  border: 1px solid var(--border);
  transition: var(--transition);
}

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

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.testimonial-card {
  background: white;
  border-radius: 1rem;
  padding: 2.5rem;
  box-shadow: var(--shadow);
  position: relative;
  transition: var(--transition);
}

.testimonial-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.testimonial-quote {
  font-size: 4rem;
  color: var(--secondary);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: 1rem;
  font-family: Georgia, serif;
}

.testimonial-text {
  color: var(--text-gray);
  line-height: 1.8;
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.testimonial-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}

.testimonial-info h4 {
  font-size: 1rem;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.testimonial-info p {
  font-size: 0.875rem;
  color: var(--text-gray);
}

.cta-section {
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
    z-index: 1001;
    position: relative;
  }

  .nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    transform: translateX(100%);
    transition: var(--transition);
    z-index: 998;
    padding-top: 100px;
    height: 100vh;
    overflow-y: auto;
  }

  .nav.active {
    transform: translateX(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    max-width: 400px;
    padding: 0 2rem;
    margin: 0;
  }

  .nav-item {
    width: 100%;
    text-align: center;
    border-bottom: 1px solid var(--border);
    list-style: none;
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-link {
    font-size: 1.25rem;
    display: block;
    padding: 1.25rem 0;
    color: var(--text-dark);
  }

  .nav-link:hover,
  .nav-link.active {
    color: var(--secondary);
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .process-flow::before {
    display: none;
  }

  .process-step {
    padding: 1.5rem;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .timeline-row {
    grid-template-columns: 1fr;
  }

  .timeline-row:nth-child(even) .timeline-left {
    order: 2;
  }

  .timeline-row:nth-child(even) .timeline-right {
    order: 1;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .section {
    padding: 3rem 0;
  }

  .page-header {
    padding: 6rem 0 3rem;
  }

  .page-header h1 {
    font-size: 2rem;
  }
}