/* 全局变量设置 */
:root {
  --primary-color: #2E8B57; /* 主色调：海洋绿 */
  --secondary-color: #1E90FF; /* 辅助色：道奇蓝 */
  --background-color: #F5F5F5; /* 背景色：浅灰 */
  --text-color: #333333; /* 文字颜色：深灰 */
  --accent-color: #FF6347; /* 点缀色：番茄红 */
}

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

/* 设置全局字体和背景 */
body {
  font-family: 'Roboto', sans-serif;
  background: linear-gradient(135deg, var(--background-color), #E0F7FA);
  color: var(--text-color);
  line-height: 1.6;
  padding: 20px;
}

/* 导航栏样式 */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--primary-color);
  padding: 15px 30px;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.navbar a {
  color: #FFFFFF;
  text-decoration: none;
  margin: 0 15px;
  position: relative;
  transition: color 0.3s;
}

.navbar a::after {
  content: '';
  position: absolute;
  width: 0%;
  height: 2px;
  bottom: -5px;
  left: 0;
  background-color: var(--accent-color);
  transition: width 0.3s;
}

.navbar a:hover::after {
  width: 100%;
}

.navbar .logo {
  font-size: 1.5rem;
  font-weight: bold;
}

/* 主内容区布局 */
.container {
  display: grid;
  grid-template-columns: 250px 1fr 300px;
  grid-gap: 20px;
  margin-top: 80px; /* 为固定导航栏留出空间 */
}

.sidebar {
  position: sticky;
  top: 80px;
  background-color: #FFFFFF;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.sidebar a {
  display: block;
  margin: 10px 0;
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s;
}

.sidebar a:hover {
  color: var(--secondary-color);
}

.main-content {
  background-color: #FFFFFF;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  position: relative;
}

.main-content img {
  width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.main-content img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 12px rgba(0, 0, 0, 0.2);
}

.dashboard {
  background-color: #FFFFFF;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.dashboard-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.dashboard-item:last-child {
  margin-bottom: 0;
}

.dashboard-item .label {
  font-weight: bold;
}

.dashboard-item .value {
  color: var(--secondary-color);
}

/* 按钮样式 */
.button {
  background-color: var(--primary-color);
  color: #FFFFFF;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.3s;
}

.button:hover {
  background-color: var(--secondary-color);
  transform: translateY(-3px);
}

/* 代码块样式 */
pre {
  background: #F0F0F0;
  padding: 20px;
  border-radius: 10px;
  overflow-x: auto;
  margin: 20px 0;
}

pre code {
  font-family: 'Courier New', Courier, monospace;
  color: #333333;
}

/* 动画效果 */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.fade-in {
  animation: fadeIn 2s ease-in-out;
}

/* 响应式设计 */
@media (max-width: 1200px) {
  .container {
    grid-template-columns: 200px 1fr 250px;
  }
}

@media (max-width: 992px) {
  .container {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: relative;
    top: 0;
    margin-bottom: 20px;
  }

  .dashboard {
    margin-top: 20px;
  }
}

@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .navbar .logo {
    margin-bottom: 10px;
  }
}