/* 全局样式设置 */
body {
  margin: 0;
  padding: 0;
  font-family: 'Roboto', sans-serif; /* 使用现代无衬线字体 */
  background: linear-gradient(135deg, #81C784 70%, #03A9F4 25%, #FFEB3B 5%);
  color: #333333;
  transition: background 0.5s ease;
}

/* 导航栏样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 30px;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 1);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.navbar ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

.navbar li {
  position: relative;
}

.navbar a {
  text-decoration: none;
  color: #03A9F4;
  font-size: 16px;
  font-weight: 500;
  transition: color 0.3s;
}

.navbar a:hover {
  color: #81C784;
}

/* 下拉菜单样式 */
.dropdown-content {
  display: none;
  position: absolute;
  background-color: #ffffff;
  min-width: 160px;
  box-shadow: 0px 8px 16px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown:hover .dropdown-content {
  display: block;
}

.dropdown-content a {
  color: #03A9F4;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  font-size: 14px;
}

.dropdown-content a:hover {
  background-color: #f1f1f1;
  color: #81C784;
}

/* 主体内容样式 */
.container {
  padding: 100px 50px 50px 50px; /* 顶部留出导航栏空间 */
  display: flex;
  flex-direction: column;
  gap: 50px;
}

.article-title {
  font-size: 2em;
  color: #03A9F4;
  text-align: center;
  margin-bottom: 20px;
}

.article-section {
  max-width: 800px;
  margin: 0 auto;
}

.article-section h3 {
  font-size: 1.5em;
  color: #81C784;
  margin-bottom: 15px;
}

.article-section p {
  font-size: 1em;
  line-height: 1.6;
  color: #555555;
  margin-bottom: 15px;
}

.article-section pre {
  background: #f5f5f5;
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 20px;
}

.article-section code {
  font-family: 'Courier New', Courier, monospace;
  color: #d32f2f;
}

/* 图片样式 */
.article-images {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
}

.article-images img {
  width: 320px;
  height: 320px;
  object-fit: cover;
  border-radius: 15px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
  transition: transform 0.3s, box-shadow 0.3s;
}

.article-images img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

/* 提示信息样式 */
.reference-note {
  text-align: center;
  font-size: 1.2em;
  color: #ff5722;
  margin-bottom: 30px;
}

/* 响应式设计 */
@media (max-width: 1200px) {
  .container {
    padding: 80px 30px 30px 30px;
  }
  
  .navbar ul {
    gap: 15px;
  }
  
  .navbar a {
    font-size: 15px;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 10px 20px;
  }
  
  .container {
    padding: 60px 20px 20px 20px;
  }
  
  .article-title {
    font-size: 1.8em;
  }
  
  .article-section h3 {
    font-size: 1.3em;
  }
  
  .article-images {
    flex-direction: column;
    align-items: center;
  }
  
  .article-images img {
    width: 100%;
    height: auto;
  }
}