/* 全局样式 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Roboto', sans-serif;
  color: #333;
  background: linear-gradient(135deg, #1B385C 70%, #FFA042 25%, #E0E0E0 5%);
  line-height: 1.6;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: rgba(27, 56, 92, 0.9);
  padding: 15px 0;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  display: flex;
  justify-content: center;
}

.navbar ul {
  list-style: none;
  display: flex;
  gap: 30px;
}

.navbar a {
  color: #FFFFFF;
  text-decoration: none;
  font-size: 18px;
  transition: color 0.3s ease;
}

.navbar a:hover {
  color: #FFA042;
}

/* 主体内容样式 */
.container {
  max-width: 1200px;
  margin: 100px auto 50px;
  padding: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.section {
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.section:hover {
  transform: translateY(-10px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.section img {
  width: 100%;
  border-radius: 10px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  transition: transform 0.3s;
}

.section img:hover {
  transform: scale(1.05);
}

.section h2 {
  color: #1B385C;
  font-size: 24px;
  margin-top: 15px;
}

.section p {
  font-size: 16px;
  color: #555;
  margin-top: 10px;
}

/* 按钮样式 */
.button {
  background: linear-gradient(45deg, #FFA042, #FF8C00);
  border: none;
  border-radius: 25px;
  color: white;
  padding: 12px 24px;
  cursor: pointer;
  transition: background 0.3s ease;
  font-size: 16px;
}

.button:hover {
  background: linear-gradient(45deg, #FF8C00, #FFA042);
}

/* 折叠内容样式 */
.collapsible {
  background-color: #1B385C;
  color: white;
  cursor: pointer;
  padding: 10px 15px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 18px;
  border-radius: 5px;
  margin-top: 20px;
}

.active, .collapsible:hover {
  background-color: #FF8C00;
}

.content {
  padding: 0 15px;
  display: none;
  overflow: hidden;
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: 5px;
  margin-bottom: 20px;
  transition: max-height 0.2s ease-out;
}

code {
  background-color: #F5F5F5;
  padding: 2px 4px;
  border-radius: 4px;
  font-family: 'Courier New', Courier, monospace;
}

pre {
  background-color: #F5F5F5;
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
  font-family: 'Courier New', Courier, monospace;
}

/* 代码示例样式 */
.code-example {
  background-color: #2d2d2d;
  color: #f8f8f2;
  padding: 15px;
  border-radius: 5px;
  font-family: 'Courier New', Courier, monospace;
  overflow-x: auto;
}

.code-example code {
  color: #f8f8f2;
}

/* 表格样式 */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

thead {
  background-color: #1B385C;
  color: white;
}

th, td {
  padding: 12px;
  border: 1px solid #E0E0E0;
  text-align: left;
}

/* 背景动态效果 */
.background {
  background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center fixed;
  background-size: cover;
  animation: backgroundMove 60s linear infinite;
}

@keyframes backgroundMove {
  from { background-position: 0 0; }
  to { background-position: 100% 0; }
}

/* 导航链接平滑滚动 */
html {
  scroll-behavior: smooth;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .navbar ul {
    flex-direction: column;
    align-items: center;
    gap: 15px;
  }

  .container {
    grid-template-columns: 1fr;
    padding: 10px;
  }

  .navbar a {
    font-size: 16px;
  }

  .section h2 {
    font-size: 20px;
  }

  .section p {
    font-size: 14px;
  }
}