/**
 * ============================================
 * 人生剧本导航组件样式 - 哈利波特风格
 * 文件: components/nav.css
 * 版本: 2.4.2
 * 描述: 参考harrypotter.com的专业级导航样式
 * ============================================
 */

/* ============================================
   CSS Variables (Design Tokens)
   ============================================ */
:root {
  /* 颜色系统 */
  --nav-color-bg-header: #0a0a1a;
  --nav-color-bg-nav: #0f0f2e;
  --nav-color-bg-dropdown: #1a1a3e;
  --nav-color-bg-drawer: #0f0f2e;
  --nav-color-text: #ffffff;
  --nav-color-text-secondary: rgba(255, 255, 255, 0.7);
  --nav-color-hover: #d4af37;
  --nav-color-border: rgba(212, 175, 55, 0.3);
  --nav-color-overlay: rgba(0, 0, 0, 0.7);
  
  /* 尺寸系统 */
  --nav-height-header: 70px;
  --nav-height-nav: 50px;
  --nav-drawer-width: 280px;
  
  /* 字体系统 */
  --nav-font-size: 14px;
  --nav-font-weight: 500;
  --nav-letter-spacing: 1px;
  
  /* 过渡动画 */
  --nav-transition-fast: 0.2s ease;
  --nav-transition-normal: 0.3s ease;
  --nav-transition-slow: 0.4s ease;
  
  /* 阴影 */
  --nav-shadow-dropdown: 0 10px 40px rgba(0, 0, 0, 0.5);
  --nav-shadow-drawer: 2px 0 20px rgba(0, 0, 0, 0.5);
}

/* ============================================
   Reset & Base Styles
   ============================================ */
.nav-header-bar,
.nav-header-bar *,
.nav-main-nav,
.nav-main-nav *,
.nav-drawer,
.nav-drawer * {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ============================================
   Header Bar (顶部栏)
   ============================================ */
.nav-header-bar {
  background-color: var(--nav-color-bg-header);
  height: var(--nav-height-header);
  border-bottom: 1px solid var(--nav-color-border);
  position: relative;
  z-index: 1000;
}

.nav-header-container {
  max-width: 1400px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 社交链接 */
.nav-social-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
}

.nav-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--nav-color-text-secondary);
  transition: color var(--nav-transition-fast), transform var(--nav-transition-fast);
}

.nav-social-link:hover {
  color: var(--nav-color-hover);
  transform: translateY(-2px);
}

.nav-social-icon {
  width: 20px;
  height: 20px;
}

/* Logo */
.nav-logo-wrapper {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-logo-link {
  text-decoration: none;
  display: flex;
  align-items: center;
}

.nav-logo-text {
  font-size: 24px;
  font-weight: 700;
  color: var(--nav-color-hover);
  letter-spacing: 3px;
  text-transform: uppercase;
  font-family: 'Cinzel', 'Georgia', serif;
  text-shadow: 0 0 20px rgba(212, 175, 55, 0.3);
  transition: text-shadow var(--nav-transition-fast);
}

.nav-logo-link:hover .nav-logo-text {
  text-shadow: 0 0 30px rgba(212, 175, 55, 0.5);
}

/* 头部操作区 */
.nav-header-actions {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 20px;
}

/* 搜索框 */
.nav-search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-search-input {
  width: 160px;
  height: 36px;
  padding: 0 36px 0 14px;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--nav-color-border);
  border-radius: 4px;
  color: var(--nav-color-text);
  font-size: 13px;
  transition: all var(--nav-transition-fast);
}

.nav-search-input::placeholder {
  color: var(--nav-color-text-secondary);
}

.nav-search-input:focus {
  outline: none;
  width: 200px;
  background-color: rgba(255, 255, 255, 0.12);
  border-color: var(--nav-color-hover);
}

.nav-search-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--nav-color-text-secondary);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--nav-transition-fast);
}

.nav-search-btn:hover {
  color: var(--nav-color-hover);
}

.nav-search-icon {
  width: 16px;
  height: 16px;
}

/* 用户按钮 */
.nav-user-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-btn {
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 4px;
  transition: all var(--nav-transition-fast);
  letter-spacing: 0.5px;
}

.nav-btn-login {
  color: var(--nav-color-text);
  background-color: transparent;
  border: 1px solid var(--nav-color-border);
}

.nav-btn-login:hover {
  border-color: var(--nav-color-hover);
  color: var(--nav-color-hover);
}

.nav-btn-register {
  color: var(--nav-color-bg-header);
  background-color: var(--nav-color-hover);
  border: 1px solid var(--nav-color-hover);
}

.nav-btn-register:hover {
  background-color: #e5c158;
  border-color: #e5c158;
  box-shadow: 0 0 15px rgba(212, 175, 55, 0.4);
}

/* ============================================
   Main Navigation (主导航栏)
   ============================================ */
.nav-main-nav {
  background-color: var(--nav-color-bg-nav);
  height: var(--nav-height-nav);
  position: relative;
  z-index: 999;
}

.nav-main-container {
  max-width: 1400px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
}

/* 汉堡按钮 (移动端) */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  gap: 5px;
}

.nav-hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--nav-color-text);
  transition: all var(--nav-transition-fast);
}

.nav-hamburger:hover .nav-hamburger-line {
  background-color: var(--nav-color-hover);
}

.nav-hamburger[aria-expanded="true"] .nav-hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-hamburger[aria-expanded="true"] .nav-hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-hamburger[aria-expanded="true"] .nav-hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 8px;
}

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

.nav-menu-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 18px;
  height: var(--nav-height-nav);
  color: var(--nav-color-text);
  font-size: var(--nav-font-size);
  font-weight: var(--nav-font-weight);
  letter-spacing: var(--nav-letter-spacing);
  text-transform: uppercase;
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--nav-transition-fast);
  white-space: nowrap;
}

.nav-menu-link:hover,
.nav-menu-link:focus,
.nav-menu-item.active .nav-menu-link {
  color: var(--nav-color-hover);
}

/* 下拉箭头 */
.nav-dropdown-arrow {
  width: 10px;
  height: 10px;
  transition: transform var(--nav-transition-fast);
}

.nav-has-dropdown:hover .nav-dropdown-arrow,
.nav-has-dropdown .nav-dropdown-toggle[aria-expanded="true"] .nav-dropdown-arrow {
  transform: rotate(180deg);
}

/* ============================================
   Dropdown Menu (下拉菜单)
   ============================================ */
.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  min-width: 200px;
  background-color: var(--nav-color-bg-dropdown);
  border: 1px solid var(--nav-color-border);
  border-radius: 4px;
  box-shadow: var(--nav-shadow-dropdown);
  list-style: none;
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transition: all var(--nav-transition-normal);
  z-index: 1001;
}

.nav-has-dropdown:hover .nav-dropdown-menu,
.nav-has-dropdown .nav-dropdown-toggle[aria-expanded="true"] + .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

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

.nav-dropdown-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  color: var(--nav-color-text);
  font-size: 14px;
  text-decoration: none;
  transition: all var(--nav-transition-fast);
}

.nav-dropdown-link:hover {
  background-color: rgba(212, 175, 55, 0.1);
  color: var(--nav-color-hover);
}

.nav-dropdown-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
}

.nav-dropdown-text {
  font-weight: 400;
  letter-spacing: 0.5px;
}

/* ============================================
   Mobile Drawer (移动端抽屉)
   ============================================ */
.nav-drawer-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--nav-color-overlay);
  opacity: 0;
  visibility: hidden;
  transition: all var(--nav-transition-normal);
  z-index: 1002;
}

.nav-drawer-overlay.active {
  opacity: 1;
  visibility: visible;
}

.nav-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--nav-drawer-width);
  height: 100vh;
  background-color: var(--nav-color-bg-drawer);
  box-shadow: var(--nav-shadow-drawer);
  transform: translateX(-100%);
  transition: transform var(--nav-transition-normal);
  z-index: 1003;
  display: flex;
  flex-direction: column;
}

.nav-drawer.active {
  transform: translateX(0);
}

/* 抽屉头部 */
.nav-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--nav-color-border);
}

.nav-drawer-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--nav-color-hover);
  letter-spacing: 2px;
  font-family: 'Cinzel', 'Georgia', serif;
}

.nav-drawer-close {
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  color: var(--nav-color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all var(--nav-transition-fast);
}

.nav-drawer-close:hover {
  background-color: rgba(212, 175, 55, 0.1);
  color: var(--nav-color-hover);
}

.nav-drawer-close svg {
  width: 20px;
  height: 20px;
}

/* 抽屉内容 */
.nav-drawer-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px 0;
}

.nav-drawer-menu {
  list-style: none;
}

.nav-drawer-item {
  display: block;
}

.nav-drawer-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  color: var(--nav-color-text);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-decoration: none;
  background: none;
  border: none;
  width: 100%;
  cursor: pointer;
  transition: all var(--nav-transition-fast);
  text-align: left;
}

.nav-drawer-link:hover,
.nav-drawer-item.active .nav-drawer-link {
  background-color: rgba(212, 175, 55, 0.1);
  color: var(--nav-color-hover);
}

/* 分隔线 */
.nav-drawer-divider {
  height: 1px;
  background-color: var(--nav-color-border);
  margin: 12px 24px;
  list-style: none;
}

/* 子菜单切换按钮 */
.nav-drawer-submenu-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-drawer-submenu-icon {
  width: 12px;
  height: 12px;
  transition: transform var(--nav-transition-fast);
}

.nav-drawer-submenu-toggle[aria-expanded="true"] .nav-drawer-submenu-icon {
  transform: rotate(90deg);
}

/* 子菜单 */
.nav-drawer-submenu {
  list-style: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--nav-transition-normal);
  background-color: rgba(0, 0, 0, 0.2);
}

.nav-drawer-submenu.active {
  max-height: 300px;
}

.nav-drawer-submenu-item {
  display: block;
}

.nav-drawer-submenu-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px 12px 48px;
  color: var(--nav-color-text-secondary);
  font-size: 14px;
  text-decoration: none;
  transition: all var(--nav-transition-fast);
}

.nav-drawer-submenu-link:hover {
  color: var(--nav-color-hover);
  background-color: rgba(212, 175, 55, 0.05);
}

.nav-drawer-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

/* 抽屉底部 */
.nav-drawer-footer {
  padding: 20px 24px;
  border-top: 1px solid var(--nav-color-border);
  display: flex;
  gap: 12px;
}

.nav-drawer-btn {
  flex: 1;
  padding: 12px;
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border-radius: 4px;
  transition: all var(--nav-transition-fast);
  letter-spacing: 0.5px;
}

.nav-drawer-btn-login {
  color: var(--nav-color-text);
  background-color: transparent;
  border: 1px solid var(--nav-color-border);
}

.nav-drawer-btn-login:hover {
  border-color: var(--nav-color-hover);
  color: var(--nav-color-hover);
}

.nav-drawer-btn-register {
  color: var(--nav-color-bg-header);
  background-color: var(--nav-color-hover);
  border: 1px solid var(--nav-color-hover);
}

.nav-drawer-btn-register:hover {
  background-color: #e5c158;
  border-color: #e5c158;
}

/* ============================================
   Responsive Styles (响应式设计)
   ============================================ */
@media screen and (max-width: 1024px) {
  /* 平板: 隐藏搜索框 */
  .nav-search-wrapper {
    display: none;
  }
}

@media screen and (max-width: 768px) {
  /* 移动端: 调整顶部栏 */
  .nav-header-container {
    padding: 0 16px;
  }
  
  .nav-social-links {
    display: none;
  }
  
  .nav-logo-wrapper {
    flex: 0 0 auto;
  }
  
  .nav-logo-text {
    font-size: 20px;
  }
  
  .nav-user-actions {
    display: none;
  }
  
  /* 显示汉堡按钮 */
  .nav-hamburger {
    display: flex;
  }
  
  /* 隐藏桌面菜单 */
  .nav-menu {
    display: none;
  }
  
  .nav-main-container {
    padding: 0 16px;
  }
}

@media screen and (max-width: 480px) {
  .nav-logo-text {
    font-size: 18px;
    letter-spacing: 2px;
  }
  
  .nav-drawer {
    width: 260px;
  }
}

/* ============================================
   Accessibility (无障碍)
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .nav-header-bar *,
  .nav-main-nav *,
  .nav-drawer *,
  .nav-drawer-overlay {
    transition: none !important;
  }
}

/* 焦点样式 */
.nav-menu-link:focus-visible,
.nav-dropdown-link:focus-visible,
.nav-drawer-link:focus-visible,
.nav-drawer-submenu-link:focus-visible,
.nav-btn:focus-visible,
.nav-drawer-btn:focus-visible,
.nav-hamburger:focus-visible,
.nav-drawer-close:focus-visible,
.nav-social-link:focus-visible,
.nav-search-input:focus-visible,
.nav-search-btn:focus-visible {
  outline: 2px solid var(--nav-color-hover);
  outline-offset: 2px;
}

/* 隐藏焦点轮廓 (鼠标点击时) */
.nav-menu-link:focus:not(:focus-visible),
.nav-dropdown-link:focus:not(:focus-visible),
.nav-drawer-link:focus:not(:focus-visible),
.nav-drawer-submenu-link:focus:not(:focus-visible),
.nav-btn:focus:not(:focus-visible),
.nav-drawer-btn:focus:not(:focus-visible),
.nav-hamburger:focus:not(:focus-visible),
.nav-drawer-close:focus:not(:focus-visible),
.nav-social-link:focus:not(:focus-visible),
.nav-search-btn:focus:not(:focus-visible) {
  outline: none;
}

/* 屏幕阅读器专用 */
.nav-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}