/* 重置和基础样式 */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    font-family: 'Open Sans', sans-serif;
    background: linear-gradient(135deg, #0A66C2, #673AB7);
    color: #ffffff;
    line-height: 1.6;
    background-attachment: fixed;
    background-size: cover;
    background-position: center;
    min-height: 100vh;
  }

  /* 容器 */
  .container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
  }

  /* 导航栏 */
  nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 102, 194, 0.8);
    transition: background 0.3s ease;
    z-index: 1000;
  }

  nav.scrolled {
    background: rgba(10, 102, 194, 1);
  }

  nav ul {
    display: flex;
    list-style: none;
    justify-content: center;
    padding: 15px 0;
  }

  nav ul li {
    margin: 0 15px;
  }

  nav ul li a {
    color: #ffffff;
    text-decoration: none;
    font-weight: bold;
    position: relative;
  }

  nav ul li a::after {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: #4CAF50;
    transition: width 0.3s;
  }

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

  /* 头部部分 */
  header {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 102, 194, 0.5);
    backdrop-filter: blur(10px);
    text-align: center;
  }

  header h1 {
    font-family: 'Roboto', sans-serif;
    font-size: 3rem;
    color: #ffffff;
    margin-bottom: 20px;
  }

  header p {
    font-size: 1.2rem;
    color: #e0e0e0;
    max-width: 600px;
    margin: 0 auto;
  }

  /* 按钮样式 */
  .button {
    display: inline-block;
    padding: 10px 20px;
    background: #4CAF50;
    color: #ffffff;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: background 0.3s ease, transform 0.3s ease;
    margin-top: 20px;
  }

  .button:hover {
    background: #45a049;
    transform: scale(1.05);
  }

  .button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.5s ease, height 0.5s ease;
  }

  .button:hover::before {
    width: 200%;
    height: 200%;
  }

  /* 主内容区 */
  main {
    padding: 80px 0 40px;
  }

  /* 卡片样式 */
  .card {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    padding: 20px;
    margin: 20px 0;
    backdrop-filter: blur(10px);
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .card:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
  }

  /* 文章样式 */
  article {
    background: rgba(255, 255, 255, 0.3);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    backdrop-filter: blur(10px);
    color: #ffffff;
    margin-bottom: 40px;
  }

  article h2 {
    font-family: 'Roboto', sans-serif;
    font-size: 2rem;
    margin-bottom: 20px;
    color: #ffffff;
  }

  article h3, article h4 {
    color: #4CAF50;
  }

  article p, article ul, article table {
    margin-bottom: 20px;
  }

  article ul {
    list-style: disc inside;
  }

  article table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
  }

  article table, article th, article td {
    border: 1px solid #ffffff;
  }

  article th, article td {
    padding: 10px;
    text-align: left;
  }

  article pre {
    background: rgba(0, 0, 0, 0.8);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
  }

  article code {
    font-family: 'Courier New', Courier, monospace;
    color: #4CAF50;
  }

  /* 图片样式 */
  .image-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
  }

  .image-gallery img {
    width: 100%;
    max-width: 320px;
    border-radius: 10px;
  }

  /* 响应式网格布局 */
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
  }

  /* 页脚 */
  footer {
    text-align: center;
    padding: 20px;
    background: rgba(10, 102, 194, 0.8);
    color: #ffffff;
  }

  /* 动画关键帧 */
  @keyframes aurora-move {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }

  /* 媒体查询 */
  @media (max-width: 1440px) {
    header h1 {
      font-size: 2.5rem;
    }
    article h2 {
      font-size: 1.8rem;
    }
  }

  @media (max-width: 1200px) {
    .container {
      width: 95%;
    }
    nav ul {
      justify-content: space-around;
    }
  }

  @media (max-width: 1024px) {
    header h1 {
      font-size: 2rem;
    }
    article h2 {
      font-size: 1.6rem;
    }
    .image-gallery img {
      max-width: 100%;
    }
  }

  @media (max-width: 768px) {
    nav ul {
      flex-direction: column;
      background: rgba(10, 102, 194, 0.9);
      position: absolute;
      top: 60px;
      left: -100%;
      width: 100%;
      transition: left 0.3s ease;
    }
    nav ul.active {
      left: 0;
    }
    .menu-toggle {
      display: block;
      cursor: pointer;
      color: #ffffff;
      font-size: 1.5rem;
      padding: 15px;
    }
  }

  @media (max-width: 480px) {
    header h1 {
      font-size: 1.5rem;
    }
    .button {
      padding: 8px 16px;
      font-size: 0.9rem;
    }
  }

  /* 链接样式 */
  a {
    color: #4CAF50;
    text-decoration: none;
  }

  a:hover {
    text-decoration: underline;
  }

  /* 工具提示 */
  .tooltip {
    position: relative;
    display: inline-block;
    cursor: pointer;
  }

  .tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.75);
    color: #fff;
    padding: 5px 10px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
  }

  .tooltip:hover::after {
    opacity: 1;
  }

  /* 平滑滚动 */
  html {
    scroll-behavior: smooth;
  }