/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #2d3748;
  background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
  min-height: 100vh;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏样式 - 高端玻璃态设计 */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 3rem;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar-logo {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.navbar-menu {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.navbar-item {
  color: #4a5568;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  padding: 0.5rem 0;
}

.navbar-item:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #3b82f6, #1e40af);
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar-item:hover {
  color: #1e40af;
}

.navbar-item:hover:after {
  width: 100%;
}

.navbar-button {
  padding: 0.75rem 1.75rem;
  background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
  color: #fff;
  border: none;
  border-radius: 12px;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.navbar-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

/* 章节样式 */
.section {
  padding: 100px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 64px;
  position: relative;
}

.section-title h2 {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #60a5fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
}

.section-title p {
  font-size: 18px;
  color: #64748b;
  font-weight: 400;
}

.section-title:after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, #3b82f6, #1e40af);
  margin: 24px auto 0;
  border-radius: 2px;
}

/* 关于我们页面样式 */
.about-page {
  padding-top: 60px;
}

.about-text {
  font-size: 17px;
  line-height: 2;
  color: #475569;
  max-width: 900px;
  margin: 0 auto;
  margin-bottom: 64px;
  text-align: justify;
}

.about-text p {
  margin-bottom: 24px;
  position: relative;
  padding-left: 20px;
}

.about-text p:before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 3px;
  height: calc(100% - 20px);
  background: linear-gradient(180deg, #3b82f6, #1e40af);
  border-radius: 2px;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-bottom: 100px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 250, 252, 0.8) 100%);
  padding: 48px;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.8);
}

.about-image {
  position: relative;
  overflow: hidden;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.about-image:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(30, 64, 175, 0.15) 100%);
  z-index: 1;
  transition: opacity 0.5s ease;
}

.about-image:hover:before {
  opacity: 0.7;
}

.about-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.about-text h3 {
  font-size: 24px;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 16px;
  margin-top: 32px;
  position: relative;
  display: inline-block;
}

.about-text h3:first-child {
  margin-top: 0;
}

.about-text h3:after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, #3b82f6, #1e40af);
  border-radius: 2px;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  margin-bottom: 100px;
}

.feature-item {
  text-align: center;
  padding: 48px 32px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.9) 100%);
  border-radius: 20px;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid rgba(226, 232, 240, 0.5);
  position: relative;
  overflow: hidden;
}

.feature-item:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #3b82f6, #1e40af);
  transform: scaleX(0);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-item:hover:before {
  transform: scaleX(1);
}

.feature-item:hover {
  transform: translateY(-12px);
  box-shadow: 0 30px 80px rgba(59, 130, 246, 0.15);
  border-color: rgba(59, 130, 246, 0.2);
}

.feature-icon {
  font-size: 64px;
  margin-bottom: 24px;
  display: inline-block;
  filter: drop-shadow(0 4px 12px rgba(59, 130, 246, 0.3));
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-item:hover .feature-icon {
  transform: scale(1.15) rotate(5deg);
}

.feature-item h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
  color: #1e293b;
}

.feature-item p {
  font-size: 15px;
  color: #64748b;
  line-height: 1.8;
}

/* 页脚样式 */
.footer {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #fff;
  padding: 80px 0 40px;
  position: relative;
}

.footer:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #3b82f6, #1e40af, #60a5fa);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 64px;
  margin-bottom: 48px;
}

.footer-section h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 28px;
  color: #f1f5f9;
  position: relative;
  padding-bottom: 12px;
}

.footer-section h3:after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, #3b82f6, #1e40af);
  border-radius: 2px;
}

.footer-section p {
  font-size: 15px;
  line-height: 1.9;
  margin-bottom: 16px;
  color: #94a3b8;
}

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

.footer-section ul li {
  margin-bottom: 14px;
  position: relative;
  padding-left: 20px;
}

.footer-section ul li:before {
  content: '→';
  position: absolute;
  left: 0;
  color: #3b82f6;
  font-weight: bold;
  transition: transform 0.3s ease;
}

.footer-section ul li:hover:before {
  transform: translateX(5px);
}

.footer-section ul li a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 15px;
  transition: all 0.3s ease;
  display: inline-block;
}

.footer-section ul li a:hover {
  color: #60a5fa;
  transform: translateX(5px);
}

.footer-bottom {
  text-align: center;
  padding-top: 40px;
  margin-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 15px;
  color: #64748b;
}

/* 动画效果 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.feature-item {
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) backwards;
}

.feature-item:nth-child(1) { animation-delay: 0.1s; }
.feature-item:nth-child(2) { animation-delay: 0.2s; }
.feature-item:nth-child(3) { animation-delay: 0.3s; }
.feature-item:nth-child(4) { animation-delay: 0.4s; }
.feature-item:nth-child(5) { animation-delay: 0.5s; }
.feature-item:nth-child(6) { animation-delay: 0.6s; }

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    padding: 1.5rem;
  }
  
  .navbar-menu {
    margin-top: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
  }
  
  .section-title h2 {
    font-size: 32px;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    padding: 32px;
    gap: 40px;
  }
  
  .about-features {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}