/**
 * Navbar Styles (Updated)
 * 导航栏样式（更新版）- History 下拉菜单
 */

/* Navbar Container */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--navbar-height);
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: background-color var(--transition-normal),
              border-color var(--transition-normal);
}

.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Logo */
.navbar-logo {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.navbar-logo:hover {
  color: var(--color-primary);
}

/* Navigation Links */
.navbar-links {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  background-color: var(--color-surface);
}

/* History Dropdown */
.history-dropdown {
  position: relative;
}

.history-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.history-btn:hover,
.history-dropdown.active .history-btn {
  background-color: var(--color-surface);
}

.history-icon {
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.history-btn:hover .history-icon {
  opacity: 1;
}

/* Right Side Controls */
.navbar-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Nav Control Buttons */
.nav-control {
  position: relative;
}

.nav-control-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  transition: background-color var(--transition-fast),
              color var(--transition-fast);
  min-width: 40px;
  height: 40px;
}

.nav-control-btn:hover {
  background-color: var(--color-surface);
  color: var(--color-primary);
}

.nav-control-btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Language Switcher */
.language-flag {
  font-size: var(--text-base);
  line-height: 1;
}

.language-name {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.chevron-icon {
  color: var(--color-text-secondary);
  transition: transform var(--transition-fast);
}

.nav-control:hover .chevron-icon {
  color: var(--color-text);
}

.nav-control.active .chevron-icon {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-xs));
  right: 0;
  min-width: 200px;
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: 1001;
}

.nav-control.active .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Dropdown Items */
.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  width: 100%;
  text-align: var(--text-align-start);
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
  background-color: var(--color-surface);
}

.dropdown-item.selected {
  color: var(--color-primary);
  background-color: rgba(0, 166, 126, 0.05);
}

/* History Dropdown Specific */
.dropdown-header {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--color-border);
}

.version-dropdown-list {
  max-height: 300px;
  overflow-y: auto;
}

.version-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  border-bottom: 1px solid var(--color-border);
}

.version-dropdown-item:last-child {
  border-bottom: none;
}

.version-dropdown-item:hover {
  background-color: var(--color-surface);
}

.version-dropdown-item.current {
  background-color: rgba(0, 166, 126, 0.05);
}

.version-id {
  font-weight: 600;
  color: var(--color-primary);
  font-size: var(--text-sm);
}

.version-date {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.version-name {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.version-badge {
  padding: 2px 8px;
  background-color: var(--color-primary);
  color: white;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
}

.version-badge.current {
  background-color: var(--color-primary);
}

.dropdown-link {
  display: block;
  padding: var(--spacing-md);
  text-align: center;
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: none;
  transition: background-color var(--transition-fast);
  border-top: 1px solid var(--color-border);
}

.dropdown-link:hover {
  background-color: var(--color-surface);
}

/* Theme Icons */
.theme-icon {
  transition: opacity var(--transition-fast);
}

.theme-icon.hidden {
  display: none;
}

[data-theme='dark'] .sun-icon {
  display: none;
}

[data-theme='dark'] .moon-icon {
  display: block;
}

[data-theme='light'] .sun-icon {
  display: block;
}

[data-theme='light'] .moon-icon {
  display: none;
}

/* GitHub Link */
.github-link {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

/* Responsive */
@media (max-width: 768px) {
  .navbar-content {
    padding: 0 var(--spacing-md);
  }

  .navbar-links {
    display: none;
  }

  .language-name {
    display: none;
  }

  .nav-control-btn {
    min-width: 36px;
    height: 36px;
  }

  .dropdown-menu {
    min-width: 180px;
    right: -80px;
  }
}