/*

CutestUI 导航组件 (Navs)

导航组件用于网站的导航菜单，提供多种样式和交互效果，完全基于CSS实现，无需JavaScript。

基本样式类：
- .nav - 基础导航容器
- .nav-list - 导航列表
- .nav-item - 导航项
- .nav-link - 导航链接

样式变体：
- .-underline - 下划线样式的导航
- .-pill - 药丸形状的导航
- .-rounded - 圆角样式的导航
- .-background - 带背景色的导航
- .-transparent - 透明背景的导航
- .-dark - 深色主题导航
- .-light - 浅色主题导航
- .-vertical - 垂直导航
- .-justified - 两端对齐的导航
- .-centered - 居中对齐的导航

状态类：
- .-active - 激活状态
- .-disabled - 禁用状态

下拉菜单：
- .-has-dropdown - 包含下拉菜单的导航项
- .nav-dropdown - 下拉菜单容器
- .nav-dropdown-list - 下拉菜单列表
- .nav-dropdown-item - 下拉菜单项
- .nav-dropdown-link - 下拉菜单链接

*/

/* CSS 变量定义 */
:root {
  --nav-color-primary: #4361ee;
  --nav-color-primary-hover: #3a0ca3;
  --nav-color-secondary: #f72585;
  --nav-color-success: #4cc9f0;
  --nav-color-warning: #f72585;
  --nav-color-danger: #f72585;
  --nav-color-dark: #2b2d42;
  --nav-color-light: #f8f9fa;
  --nav-color-text: #2b2d42;
  --nav-color-text-light: #f8f9fa;
  --nav-border-radius: 8px;
  --nav-transition: all 0.3s ease;
}

/* 基础导航样式 */
.nav {
  display: inline-block;
  width: 100%;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
}

.nav-item {
  position: relative;
  margin: 0;
}

.nav-link {
  display: block;
  padding: 12px 16px;
  color: var(--nav-color-text);
  text-decoration: none;
  border-radius: var(--nav-border-radius);
  transition: var(--nav-transition);
  white-space: nowrap;
}

.nav-link:hover {
  background-color: rgba(67, 97, 238, 0.1);
  color: var(--nav-color-primary);
}

/* 激活状态 */
.nav-link.-active {
  background-color: var(--nav-color-primary);
  color: white;
}

.nav-link.-active:hover {
  background-color: var(--nav-color-primary-hover);
}

/* 禁用状态 */
.nav-link.-disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.nav-link.-disabled:hover {
  background-color: transparent;
  color: var(--nav-color-text);
}

/* 下划线样式 */
.nav.-underline .nav-link {
  position: relative;
  background-color: transparent;
}

.nav.-underline .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--nav-color-primary);
  transition: var(--nav-transition);
}

.nav.-underline .nav-link:hover::after {
  width: 100%;
}

.nav.-underline .nav-link.-active {
  background-color: transparent;
  color: var(--nav-color-primary);
}

.nav.-underline .nav-link.-active::after {
  width: 100%;
}

/* 药丸形状 */
.nav.-pill .nav-list {
  background-color: var(--nav-color-light);
  border-radius: 50px;
  padding: 4px;
}

.nav.-pill .nav-link {
  border-radius: 50px;
}

/* 圆角样式 */
.nav.-rounded .nav-list {
  background-color: var(--nav-color-light);
  border-radius: var(--nav-border-radius);
  padding: 8px;
}

/* 带背景色的导航 */
.nav.-background {
  background-color: var(--nav-color-primary);
  border-radius: var(--nav-border-radius);
}

.nav.-background .nav-link {
  color: white;
}

.nav.-background .nav-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
}

.nav.-background .nav-link.-active {
  background-color: white;
  color: var(--nav-color-primary);
}

/* 透明背景的导航 */
.nav.-transparent .nav-list {
  background-color: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: var(--nav-border-radius);
}

.nav.-transparent .nav-link {
  color: var(--nav-color-text-light);
}

/* 深色主题导航 */
.nav.-dark {
  background-color: var(--nav-color-dark);
  border-radius: var(--nav-border-radius);
}

.nav.-dark .nav-link {
  color: var(--nav-color-text-light);
}

.nav.-dark .nav-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
}

.nav.-dark .nav-link.-active {
  background-color: var(--nav-color-primary);
  color: white;
}

/* 浅色主题导航 */
.nav.-light {
  background-color: var(--nav-color-light);
  border-radius: var(--nav-border-radius);
}

/* 垂直导航 */
.nav.-vertical .nav-list {
  flex-direction: column;
}

.nav.-vertical .nav-item {
  margin: 2px 0;
  width: 100%;
}

/* 两端对齐的导航 */
.nav.-justified .nav-list {
  justify-content: space-between;
}

/* 居中对齐的导航 */
.nav.-centered .nav-list {
  justify-content: center;
}

/* 下拉菜单样式 */
.nav-item.-has-dropdown {
  position: relative;
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background-color: white;
  border-radius: var(--nav-border-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--nav-transition);
  z-index: 1000;
}

.nav-item.-has-dropdown:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-list {
  list-style: none;
  padding: 8px 0;
  margin: 0;
}

.nav-dropdown-item {
  position: relative;
}

.nav-dropdown-link {
  display: block;
  padding: 10px 16px;
  color: var(--nav-color-text);
  text-decoration: none;
  transition: var(--nav-transition);
  white-space: nowrap;
}

.nav-dropdown-link:hover {
  background-color: rgba(67, 97, 238, 0.1);
  color: var(--nav-color-primary);
}

/* 嵌套下拉菜单 */
.nav-dropdown-item.-has-dropdown .nav-dropdown {
  top: 0;
  left: 100%;
  transform: translateX(10px);
}

.nav-dropdown-item.-has-dropdown:hover .nav-dropdown {
  transform: translateX(0);
}

/* 面包屑导航 */
.nav-breadcrumb {
  display: flex;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-breadcrumb-item:not(:last-child)::after {
  content: '>';
  margin: 0 10px;
  color: var(--nav-color-text);
}

.nav-breadcrumb-link {
  color: var(--nav-color-text);
  text-decoration: none;
  transition: var(--nav-transition);
}

.nav-breadcrumb-link:hover {
  color: var(--nav-color-primary);
}

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

/* 侧边栏导航 */
.nav-sidebar {
  width: 240px;
  background-color: white;
  border-radius: var(--nav-border-radius);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.nav-sidebar .nav-list {
  flex-direction: column;
}

.nav-sidebar .nav-item {
  width: 100%;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-list {
    flex-direction: column;
  }
  
  .nav-item {
    width: 100%;
  }
  
  .nav-dropdown {
    position: static;
    min-width: 100%;
    box-shadow: none;
    border: 1px solid #eee;
  }
  
  .nav-item.-has-dropdown:hover .nav-dropdown {
    transform: none;
  }
  
  .nav-dropdown-item.-has-dropdown .nav-dropdown {
    left: 0;
    top: auto;
  }
}

/* 动画效果 */
@keyframes navFadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.nav-dropdown {
  animation: navFadeIn 0.2s ease-out;
}

/* 打印样式 */
@media print {
  .nav {
    display: none;
  }
}