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

/* 基础样式 */
body {
  font-family: 'Tahoma', Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f8f9fa;
  overflow-x: hidden;
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(0, 0, 153, 0.95);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  padding: 15px 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: white;
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-link {
  color: white;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.nav-link:after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: white;
  transition: width 0.3s ease;
}

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

/* 英雄Banner区域 */
.hero-banner {
  height: 50vh;
  width: 100%;
  padding-top: 2.5rem;
  background: linear-gradient(135deg, #000099 0%, #0033cc 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-banner:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.05" d="M0,192L48,197.3C96,203,192,213,288,229.3C384,245,480,267,576,250.7C672,235,768,181,864,181.3C960,181,1056,235,1152,234.7C1248,235,1344,181,1392,154.7L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
  background-position: bottom;
  background-repeat: no-repeat;
  background-size: cover;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 0 20px;
}

.hero-title {
  font-size: 4.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: 20px;
  line-height: 1.2;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  animation: fadeInDown 1s ease-out;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 30px;
  animation: fadeInUp 1s ease-out 0.3s;
  animation-fill-mode: both;
}

/* 描述部分 */
.description-section {
  padding: 80px 0;
  background-color: white;
}

.main-description {
  font-size: 1.25rem;
  line-height: 1.8;
  color: #444;
  max-width: 1000px;
  margin: 0 auto;
  /*text-align: justify;*/
}

.highlight {
  color: #000099;
  font-weight: 600;
  position: relative;
  cursor: pointer;
  transition: color 0.3s ease;
}

.highlight:hover {
  color: #0033cc;
}

/* 图片展示部分 */
.image-showcase {
  padding: 60px 0;
  background-color: #f0f4f8;
}

.image-wrapper {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  box-shadow: 0 15px 30px rgba(0, 0, 153, 0.1);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.image-wrapper:hover {
  transform: scale(1.05); /* 放大5% */
  transition: transform 0.3s ease; /* 可选：添加平滑过渡效果 */
}

.showcase-image {
  width: 100%;
  height: auto;
  display: block;
}

/* 概念部分 */
.concept-section {
  padding: 80px 0;
  background-color: white;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #000099;
  margin-bottom: 30px;
  text-align: center;
}

.concept-card {
  display: flex;
  align-items: flex-start;
  max-width: 900px;
  margin: 0 auto;
  padding: 30px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.concept-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 153, 0.1);
}

.concept-icon {
  font-size: 24px;
  font-weight: bold;
  color: #000099;
  margin-right: 20px;
}

.concept-content {
  font-size: 1.1rem;
  line-height: 1.7;
}

.concept-link {
  color: #000099;
  font-weight: 600;
  text-decoration: none;
  position: relative;
  transition: color 0.3s ease;
}

.concept-link:after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: -2px;
  left: 0;
  background-color: #000099;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease;
}

.concept-link:hover {
  color: #0033cc;
}

.concept-link:hover:after {
  transform: scaleX(1);
  transform-origin: left;
}

/* 页脚部分 */
.footer {
  background-color: #000099;
  color: white;
  padding: 30px 0;
  text-align: center;
}

.copyright {
  font-size: 1rem;
  opacity: 0.9;
}

.copyright a {
  color: white;
  text-decoration: none;
  transition: color 0.3s ease;
}

.copyright a:hover {
  color: lightgrey;
}

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

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

/* 响应式设计 */
@media (max-width: 1200px) {
  .hero-title {
    font-size: 3.5rem;
  }

  .section-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 992px) {
  .hero-title {
    font-size: 3rem;
  }

  .hero-subtitle {
    font-size: 1.3rem;
  }

  .main-description {
    font-size: 1.1rem;
    padding: 0 20px;
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

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

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .description-section,
  .concept-section,
  .image-showcase {
    padding: 50px 0;
  }

  .section-title {
    font-size: 1.8rem;
    margin-bottom: 30px;
  }

  .concept-card {
    padding: 20px;
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.2rem;
  }

  .main-description {
    font-size: 1.2rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .concept-content {
    font-size: 1.2rem;
  }

  .copyright {
    font-size: 0.9rem;
  }
}