/*
 navbar.css - MysticArc 导航栏组件样式
 说明：
 - 从 styles.css 中提取的导航栏相关样式
 - 包含桌面端和移动端的完整样式
 - 支持透明和实心两种状态切换
 - 优化版本：包含性能优化和浏览器兼容性改进
*/

/* 性能优化：启用硬件加速 */
.navbar,
.mobile-nav-overlay,
.dropdown-menu {
  will-change: transform, opacity;
  transform: translateZ(0); /* 强制硬件加速 */
}

/* 减少重绘：使用 contain 属性 */
.navbar {
  contain: layout style; /* 移除 paint，避免裁切下拉菜单 */
  overflow: visible; /* 允许显示溢出内容（如下拉菜单） */
}

/* 导航栏主体样式 */
.navbar {
  position: fixed; /* 固定在顶部 */
  top: 0; left: 0; right: 0; /* 横向全宽 */
  padding: 16px 0; /* 垂直内距 */
  background: transparent; /* 初始透明背景 */
  backdrop-filter: none; /* 无毛玻璃初始 */
  transition: background var(--transition-normal, 0.3s ease), backdrop-filter var(--transition-normal, 0.3s ease), box-shadow var(--transition-normal, 0.3s ease); /* 过渡效果，带降级 */
  /* 浏览器兼容性 */
  -webkit-backdrop-filter: blur(0px); /* Safari 支持 */
  -moz-backdrop-filter: blur(0px); /* Firefox 支持 */
  z-index: 1000; /* 高层级 */
}

.navbar.scrolled {
  background: rgba(10,10,15,0.6); /* 滚动后半透明背景 */
  backdrop-filter: blur(8px); /* 毛玻璃效果 */
  -webkit-backdrop-filter: blur(8px); /* Safari 支持 */
  -moz-backdrop-filter: blur(8px); /* Firefox 支持 */
  box-shadow: 0 10px 30px rgba(0,0,0,0.35); /* 投影增强层次 */
}

.nav-container { 
  display: flex; 
  align-items: center; 
  justify-content: space-between; 
  padding: 0 40px; /* 增加左右内边距 */ 
}

.nav-logo a {
  font-family: 'Playfair Display', serif; /* 使用衬线字体突显品牌 */
  font-size: 24px; /* 稍微增大字号 */
  color: var(--color-text); /* 文字色 */
  text-decoration: none; /* 移除下划线 */
  letter-spacing: 1px; /* 增加字母间距 */
}

/* 桌面端导航菜单 */
.nav-menu { 
  list-style: none; 
  display: flex; 
  gap: 32px; /* 增加菜单项间距 */ 
  margin: 0; 
  padding: 0; 
}

.nav-link { 
  color: var(--color-text); 
  text-decoration: none; 
  font-size: 15px; /* 稍微增大字体 */ 
  letter-spacing: 1.2px; /* 增加字母间距 */ 
  padding: 8px 0; /* 增加点击区域 */ 
  transition: color var(--transition-fast); 
}

.nav-link:hover { 
  color: var(--color-primary); /* 悬停时改变颜色 */ 
}

.nav-item { 
  position: relative;
  display: flex;
  align-items: center;
}

/* 桌面端下拉选单 */
.dropdown-menu {
  position: absolute; 
  top: 100%; 
  left: 0; /* 相对于父级定位 */
  padding-top: 15px; /* 增加与父元素的间距，确保鼠标移动时不会触发mouseout */
  min-width: 110px; /* 最小宽度，与语言下拉框保持一致的紧凑设计 */
  background: var(--color-surface); /* 背景色 */
  border: 1px solid var(--color-border); /* 边框 */
  border-radius: var(--radius-sm); /* 圆角 */
  box-shadow: var(--shadow-soft); /* 投影 */
  padding: 8px 0; /* 内距，与语言下拉框保持一致 */
  display: none; /* 初始隐藏 */
  z-index: 9999; /* 确保下拉菜单显示在所有其他元素之上 */
}

.nav-item.dropdown:hover .dropdown-menu { 
  display: block; 
}

.dropdown-menu li {
  list-style: none; /* 移除列表标记 */
  margin: 0;
  padding: 0;
}

.dropdown-menu a { 
  display: block; 
  padding: 10px 14px; /* 与语言选项保持一致的内距 */
  color: var(--color-text); 
  text-decoration: none; 
  border-radius: var(--radius-sm); 
  transition: background var(--transition-fast);
}

.dropdown-menu a:hover { 
  background: #1a1a22; 
}

/* 语言切换器样式已隐藏 - 默认使用繁体中文 */
/*
.language-switcher {
  position: relative;
  z-index: 1001;
  display: flex;
  align-items: center;
}

.language-toggle-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.language-toggle-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  color: var(--color-text);
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 1.2px;
  transition: color var(--transition-fast);
}

.language-toggle-link:hover {
  color: var(--color-primary);
}

.current-lang-flag { 
  display: none; 
}

.current-lang-text {
  flex: 1;
  text-align: left;
}

.dropdown-arrow {
  font-size: 10px;
  transition: transform 0.2s ease, color var(--transition-fast);
  color: var(--color-text-muted, #9aa0a6);
  margin-left: 6px;
}

.language-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 90px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 1002;
  overflow: hidden;
  list-style: none;
  margin: 0;
  padding: 8px 0;
}

.language-toggle-wrapper:hover .language-dropdown,
.language-toggle-wrapper.open .language-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.language-dropdown li { margin: 0; padding: 0; }

.language-option {
  display: block;
  padding: 10px 14px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 14px;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.language-option:hover { 
  background: rgba(255,255,255,0.06); 
  color: var(--color-primary);
}
.language-option.active {
  background: rgba(255,255,255,0.08);
  color: var(--color-primary);
  font-weight: 500;
}

.lang-flag { display: none; }
.lang-text { display: inline; }
*/

/* 汉堡选单（移动设备） */
.hamburger { 
  display: none; 
  cursor: pointer; 
  transition: transform 0.3s ease;
}

.hamburger .bar { 
  display: block; 
  width: 26px; 
  height: 2px; 
  background: var(--color-text); 
  margin: 6px 0; 
  transition: transform var(--transition-fast); 
}

.hamburger.open {
  transform: rotate(90deg);
}

.hamburger.open .bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.open .bar:nth-child(2) {
  opacity: 0;
}

.hamburger.open .bar:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* 移动端全屏导航覆盖层 */
.mobile-nav-overlay {
  display: none; /* 桌面端完全隐藏 */
}

/* 响应式断点 */
/* 桌面端强制隐藏汉堡菜单 */
@media (min-width: 769px) {
  .hamburger {
    display: none !important;
  }
}

@media (max-width: 768px) {
  /* 隐藏桌面端导航菜单 */
  .nav-menu { 
    display: none !important; 
  }
  
  .hamburger { 
    display: block !important; 
  }
  
  /* 移动端禁用桌面端下拉菜单 */
  .dropdown-menu { 
    display: none !important; 
  }
  
  .nav-item.dropdown:hover .dropdown-menu { 
    display: none !important; 
  }
  
  /* 移动端全屏导航覆盖层 */
  .mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(10, 10, 14, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: block; /* 覆盖全局的 display: none; 仅在移动端启用 */
  }
  
  .mobile-nav-overlay.open {
    opacity: 1;
    visibility: visible;
  }
  
  /* 移动端导航内容容器 */
  .mobile-nav-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    padding: 80px 40px 40px;
    transform: translateY(30px);
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
  }
  
  .mobile-nav-overlay.open .mobile-nav-content {
    transform: translateY(0);
  }
  
  /* 移动端导航关闭按钮 */
  .mobile-nav-close {
    position: absolute;
    top: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
  }
  
  .mobile-nav-close .close-line {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform-origin: center;
    transition: all 0.3s ease;
  }
  
  .mobile-nav-close .close-line:first-child {
    transform: translate(-50%, -50%) rotate(45deg);
  }
  
  .mobile-nav-close .close-line:last-child {
    transform: translate(-50%, -50%) rotate(-45deg);
  }
  
  .mobile-nav-close:hover .close-line {
    background: var(--color-primary);
  }
  
  /* 移动端导航菜单列表 */
  .mobile-nav-menu {
    list-style: none;
    margin: 0;
    padding: 0;
    width: 100%;
    max-width: 300px;
  }
  
  /* 移动端导航项目 */
  .mobile-nav-item {
    margin: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .mobile-nav-item:last-child {
    border-bottom: none;
  }
  
  /* 移动端导航链接 */
  .mobile-nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    color: #ffffff;
    text-decoration: none;
    font-size: 18px;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
  }
  
  .mobile-nav-link:hover {
    color: var(--color-primary);
  }
  
  /* 移动端下拉箭头 */
  .mobile-dropdown-arrow {
    font-size: 20px;
    transition: transform 0.3s ease;
    color: var(--color-primary);
  }
  
  .mobile-dropdown.open .mobile-dropdown-arrow {
    transform: rotate(90deg);
  }
  
  /* 移动端子菜单 */
  .mobile-submenu {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    opacity: 0;
    transform: translateY(-10px);
  }
  
  .mobile-submenu.open {
    max-height: 300px;
    padding: 12px 0;
    margin: 8px 0;
    opacity: 1;
    transform: translateY(0);
  }
  
  /* 移动端子菜单链接 */
  .mobile-submenu-link {
    display: block;
    padding: 14px 24px;
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: 16px;
    font-weight: 400;
    letter-spacing: 0.3px;
    transition: all 0.3s ease;
    position: relative;
  }
  
  .mobile-submenu-link:hover {
    color: var(--color-primary);
    background: rgba(255, 255, 255, 0.1);
  }

  .mobile-submenu-link.active {
    color: var(--color-primary);
    background: rgba(255, 255, 255, 0.05);
  }

  /* 移动端下拉箭头优化 */
  .mobile-dropdown-arrow {
    font-size: 22px;
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    color: rgba(255, 255, 255, 0.7);
    margin-left: 8px;
  }
  
  .mobile-dropdown.open .mobile-dropdown-arrow {
    transform: rotate(90deg);
    color: var(--color-primary);
  }

  /* 移动端下拉切换按钮优化 */
  .mobile-dropdown-toggle {
    display: flex;
    align-items: center;
    width: 100%;
  }
}