* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
    padding-top: 60px; /* ← 避开 fixed 导航栏的高度 */
}

.container {
  display: flex;
  gap: 24px;
  padding: 20px;
}

.sidebar {
  flex-shrink: 0;
  width: 200px;
  background: #f9f9f9;
  padding: 16px;
  border-radius: 8px;
}

/* 顶部导航栏 */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    padding: 0 20px;
    z-index: 1001;
}

.logo {
    font-size: 22px;
    font-weight: 600;
    color: #4a90e2;
    margin-right: 40px;
}

.nav-menu {
    display: flex;
    gap: 20px;
}

.nav-item {
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #555;
    font-weight: 500;
    position: relative;
}

.nav-item:hover, .nav-item.active {
    background-color: #eef7ff;
    color: #4a90e2;
    transform: translateY(-1px);
}

.sidebar-title {
    font-size: 18px;
    margin-bottom: 20px;
    color: #4a90e2;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.category-list {
    list-style: none;
}

.category-item {
    padding: 12px 15px;
    margin-bottom: 8px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #666;
}

.category-item:hover, .category-item.active {
    background-color: #eef7ff;
    color: #4a90e2;
    font-weight: 500;
}

/* 主内容区 */
.main-content {
    flex: 1;
    padding: 20px 30px 30px;
}

.content-header {
    margin-bottom: 30px;
}

.content-title {
    font-size: 28px;
    color: #4a90e2;
    margin-bottom: 10px;
}

.content-subtitle {
    color: #777;
    font-size: 16px;
}

/* 网页推荐卡片 */
.recommendations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.recommendation-card {
    background-color: #ffffff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.recommendation-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.card-title {
    font-size: 18px;
    color: #333;
    margin-bottom: 10px;  
}

.card-description {
    color: #777;
    font-size: 14px;
    margin-bottom: 15px;
}

.card-link {
    display: inline-block;
    padding: 8px 15px;
    background-color: #4a90e2;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

.card-link:hover {
    background-color: #357abd;
}

.card-category {
    display: inline-block;
    padding: 4px 10px;
    background-color: #eef7ff;
    color: #4a90e2;
    border-radius: 12px;
    font-size: 12px;
    margin-top: 10px;
}

/* 占位提示 */
.placeholder-message {
  text-align: center;
  padding: 60px 20px;
  color: #888;
  font-size: 18px;
}

.placeholder-message p {
  margin: 0;
}

.blog-body.markdown-body {
  background-color: #f8f9fa; /* 白色背景（默认） */
  /* 或者你喜欢的其他颜色，例如： */
  /* background-color: #f9f9f9; */
  /* background-color: #fafafa; */
  padding: 24px;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1); /* 可选：加一点阴影更立体 */
}

.blog-body.markdown-body {
  background-color: #e8f4ff; /* 替换为你想要的颜色 */
}

#container {
  position: relative;
  overflow: hidden;
  min-height: calc(100vh - 60px); /* 减去 topNav 高度 */
  padding-top: 20px; /* 可选：避免紧贴顶部 */
}

.view {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 1;
  
  pointer-events: auto;
}

.view.fade-out {
  opacity: 0 !important;
  pointer-events: none;
}

/* ============== 移动端适配：styles.css ============== */
@media (max-width: 768px) {
  body {
    padding-top: 56px; /* 适配更紧凑的导航栏 */
  }

  .top-nav {
    height: 56px;
    padding: 0 15px;
    flex-wrap: wrap;
  }

  .logo {
    margin-right: 15px;
    font-size: 20px;
  }

  .nav-menu {
    gap: 12px;
    overflow-x: auto;
    white-space: nowrap;
    padding: 5px 0;
    -webkit-overflow-scrolling: touch;
  }

  .container {
    flex-direction: column;
    padding: 15px;
    gap: 16px;
  }

  .sidebar {
    width: 100%;
    padding: 12px;
  }

  .main-content {
    padding: 15px;
    transition: opacity 0.4s ease-in-out;
  }

  .content-title {
    font-size: 24px;
  }

  /* 网页推荐卡片：单列 */
  .recommendations-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .recommendation-card {
    padding: 16px;
  }

  .card-title {
    font-size: 16px;
  }

  .card-description {
    font-size: 13px;
  }
}