:root {
  --primary-color: #4285f4;
  --secondary-color: #f8f9fa;
  --card-bg: #ffffff;
  --text-color: #333;
  --border-radius: 4px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}
body {
  font-family: 'Microsoft YaHei', sans-serif;
  background-color: #f5f5f5;
  color: var(--text-color);
  margin: 0;
  line-height: 1.6;
}
a {
  text-decoration: none;
  color: var(--primary-color);
  transition: var(--transition);
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}
/* 导航栏样式 */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: white;
  box-shadow: var(--shadow);
  z-index: 1000;
  padding: 12px 0;
}
.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}
.logo {
  display: flex;
  align-items: center;
}
.logo img {
  height: 40px;
  margin-right: 10px;
}
.logo span {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-color);
}
nav ul {
  display: flex;
  list-style: none;
}
nav li {
  margin: 0 10px;
  position: relative;
}
nav a {
  padding: 8px 4px;
  font-size: 0.95rem;
  font-weight: 500;
  color: #606266;
}
nav a:hover, nav a.active {
  color: var(--primary-color);
}
nav a.active:after {
  content: "";
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 2px;
  background: var(--primary-color);
}
/* 主要内容区 */
.main-content {
  display: flex;
  gap: 20px;
}
/* 左栏 - 资源详情 */
.resource-main {
  flex: 1;
  background: white;
  border-radius: var(--border-radius);
  padding: 25px;
  box-shadow: var(--shadow);
}
.resource-header {
  margin-bottom: 25px;
}
.resource-title {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 10px;
  color: #222;
}
.resource-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  color: #666;
  font-size: 14px;
  margin-bottom: 15px;
}
.resource-meta span {
  display: flex;
  align-items: center;
  gap: 5px;
}
.resource-meta i {
  color: var(--primary-color);
  font-size: 14px;
}
.resource-image {
  width: 100%;
  height: 300px;
  border-radius: var(--border-radius);
  overflow: hidden;
  margin-bottom: 20px;
}
.resource-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
/* 资源链接按钮 */
.resource-actions {
  display: flex;
  gap: 15px;
  margin: 25px 0;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  background: var(--primary-color);
  color: white;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: var(--transition);
}
.btn-primary:hover {
  background: #3367d6;
  transform: translateY(-2px);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
.btn-primary i {
  margin-right: 8px;
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  background: #f1f3f4;
  color: #555;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: var(--transition);
}
.btn-secondary:hover {
  background: #e0e0e0;
}
/* 资源描述 */
.resource-description {
  margin-bottom: 30px;
  line-height: 1.8;
}
.resource-description h2 .resource-description h3 {
  font-size: 18px;
  margin: 25px 0 15px;
  color: #222;
}
.resource-description h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid #eee;
  padding-bottom: 8px;
}
.resource-description h3 {
  font-size: 1.2rem;
}
.resource-description img {
  max-width: 100%;
  height: auto;
  border-radius: var(--border-radius);
  margin: 10px 0;
  box-shadow: var(--shadow);
}
.keywords {
  gap: 8px;
  margin-top: 15px;
  padding-bottom: 20px;
  border-bottom: 1px solid #eee;
}
.keywords a {
  font-size: 0.7rem;
  padding: 2px 8px;
  background: #f0f0f0;
  border-radius: 4px;
  color: #666;
}
.keywords ul {
  list-style: none;
  display: flex;        /* 启用 Flex 布局 */
  flex-wrap: wrap;      /* 允许换行 */
  gap: 8px;             /* 设置子项之间的间距 */
  padding: 0;           /* 移除默认内边距 */
  margin: 0;            /* 移除默认外边距 */
}
.keywords li a {
  font-size: 0.8rem;
  padding: 4px 12px;
  background: #f0f0f0;
  border-radius: 4px;
  color: #666;
  transition: var(--transition);
  white-space: nowrap;  /* 防止文字换行 */
}
.keywords li a:hover {
  background: var(--primary-color);
  color: white;
}
/* 文章导航 */
.article-navigation {
  display: flex;
  justify-content: space-between;
  margin: 40px 0 20px;
  padding-top: 20px;
  border-top: 1px solid #eee;
}
.nav-btn {
  display: inline-block;
  padding: 8px 15px;
  border-radius: var(--border-radius);
  background: #f5f5f5;
  transition: var(--transition);
  color: #555; /* 按钮的默认文字颜色 */
}

.nav-btn a{
    color: inherit; /* 继承 .nav-btn 的颜色 */
    text-decoration: none; /* 移除下划线，可选 */
}

.nav-btn:hover {
  background: var(--primary-color);
  color: white; /* 按钮悬停时的文字颜色 */
}

.nav-btn:hover a {
  color: white; /* 链接悬停时的文字颜色 */
}

/* 右栏 - 侧边栏 */
.resource-sidebar {
  width: 300px;
}
.sidebar-section {
  background: white;
  border-radius: var(--border-radius);
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.sidebar-title {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 15px;
  color: #222;
  padding-bottom: 10px;
  border-bottom: 1px solid #eee;
}
/* 类似资源 */
.similar-resources {
  list-style: none;
  padding: 0;
  margin: 0;
}
.similar-item {
  padding: 12px 0;
  border-bottom: 1px dashed #eee;
}
.similar-item:last-child {
  border-bottom: none;
}
.similar-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #555;
}
.similar-item a:hover {
  color: var(--primary-color);
}
.similar-item-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #f5f5f5;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  font-size: 18px;
}
.similar-item-content h4 {
  font-size: 15px;
  margin: 0 0 3px;
}
.similar-item-content .category {
  font-size: 12px;
  color: #999;
}
/* 标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag-cloud a{
 font-size: 0.8rem;
  padding: 4px 10px;
  background: #f0f2f5;
  border-radius: 4px;
  color: #666;
  transition: var(--transition);
}
.tag {
  display: inline-block;
  padding: 4px 12px;
  background: #f5f5f5;
  border-radius: 4px;
  font-size: 13px;
  color: #555;
  transition: var(--transition);
}
.tag:hover {
  background: var(--primary-color);
  color: white;
}
/* 页脚样式 */
footer {
  background: #343a40;
  color: white;
  padding: 10px 0;
  margin-top: 20px;
}
footer a {
  color: #6c757d;
  transition: var(--transition);
}
footer a:hover {
  color: white;
}
.copyright {
  text-align: center;
  color: #bdc3c7;
  font-size: 1rem;
}
/* 汉堡菜单 */
.menu-toggle {
  display: none;
  cursor: pointer;
  font-size: 1.5rem;
  padding: 5px 10px;
}
/* 响应式设计 */
@media (max-width: 992px) {
  .main-content {
    flex-direction: column;
  }
  .resource-sidebar {
    width: 100%;
  }
}
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-container {
    flex-direction: column;
  }
  nav {
    display: none;
  }
  nav.active {
    display: flex;
  }
  nav ul {
    flex-wrap: wrap;
  }
  nav li {
    margin: 5px 10px 5px 0;
  }
  nav.active {
    display: flex;
  }
  .logo {
    margin: 0 auto;
  }
  
  header {
    padding: 8px 0; /* 缩小导航栏内边距 */
  }
  .resource-image {
    height: 200px;
  }
  .resource-actions {
    flex-direction: column;
  }
}
/* 面包屑导航样式 */
.breadcrumb-container {
  padding: 30px 0 10px 15px;
  margin-top: 70px; /* 与header固定定位配合 */
 max-width: 1200px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  padding: 0;
  margin: 0;
  list-style: none;
  font-size: 0.9rem;
  align-items: center;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  padding: 0 8px;
  color: #c0c4cc;
  font-size: 0.8rem;
}

.breadcrumb-item a {
  color: var(--text-light);
  transition: var(--transition);
}

.breadcrumb-item a:hover {
  color: var(--primary-color);
  text-decoration: none;
}

.breadcrumb-item.active {
  color: var(--primary-color);
  font-weight: 500;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .breadcrumb-container {
    margin-top: 110px;
    padding: 10px 0;
  }
  
  .breadcrumb {
    font-size: 0.85rem;
    padding: 0 10px;
  }
  
  .breadcrumb-item + .breadcrumb-item::before {
    padding: 0 6px;
  }
nav ul {
    justify-content: center;
  }
}

@media (max-width: 576px) {
  .breadcrumb {
    font-size: 0.8rem;
	 padding: 10px 0 10px 20px;
  }
  
  .breadcrumb-item + .breadcrumb-item::before {
    padding: 0 4px;
  }
}