# All files / src/components/layout Header.tsx

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     import { Link, useNavigate } from 'react-router-dom';
    import { useAuth } from '../../hooks/useAuth';
    import { useTheme } from '../../hooks/useTheme';
    import { useState } from 'react';
    import { Moon, Sun, ChevronDown, LogOut, User, Settings, Globe } from 'lucide-react';
    import { useTranslation } from 'react-i18next';

    function Header() {
      const { user, isAuthenticated, logout } = useAuth();
      const { theme, toggleTheme } = useTheme();
      const navigate = useNavigate();
      const [showMenu, setShowMenu] = useState(false);
      const [showLangMenu, setShowLangMenu] = useState(false);
      const { t, i18n } = useTranslation();

      const handleLogout = async () => {
        await logout();
        navigate('/');
        setShowMenu(false);
      };

      const handleLangChange = (lang: string) => {
        i18n.changeLanguage(lang);
        setShowLangMenu(false);
      };

      const currentLang = i18n.language === 'zh' ? '中文' : 'English';

      return (
        <header className="sticky top-0 z-40 bg-white/80 dark:bg-gray-50/80 backdrop-blur-xl border-b border-divider dark:border-border">
          <div className="w-full px-6 h-14 flex items-center justify-between">
            {/* Logo + Nav */}
            <div className="flex items-center gap-10">
              <Link to="/" className="text-[15px] font-semibold text-text-primary flex items-center gap-2">
                <svg width="28" height="28" viewBox="0 0 28 28" fill="none" xmlns="http://www.w3.org/2000/svg" className="flex-shrink-0">
                  <rect x="3" y="4" width="22" height="20" rx="3" stroke="currentColor" strokeWidth="2"/>
                  <path d="M10 10H18M10 14H18M10 18H14" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
                  <path d="M20 10L24 7V23L20 20" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" fill="var(--color-accent-bg)"/>
                </svg>
                NovelTrans
              </Link>
              <nav className="hidden md:flex items-center gap-7">
                <Link to="/" className="text-[14px] text-text-secondary hover:text-text-primary transition-colors">
                  {t('header.nav.translate')}
                </Link>
                <Link to="/pricing" className="text-[14px] text-text-secondary hover:text-text-primary transition-colors">
                  {t('header.nav.pricing')}
                </Link>
                {isAuthenticated && (
                  <>
                    <Link to="/documents" className="text-[14px] text-text-secondary hover:text-text-primary transition-colors">
                      {t('header.nav.docs')}
                    </Link>
                    <Link to="/history" className="text-[14px] text-text-secondary hover:text-text-primary transition-colors">
                      {t('header.nav.history')}
                    </Link>
                    <Link to="/glossary" className="text-[14px] text-text-secondary hover:text-text-primary transition-colors">
                      {t('header.nav.glossary')}
                    </Link>
                    <Link to="/collab" className="text-[14px] text-text-secondary hover:text-text-primary transition-colors">
                      {t('header.nav.collaboration')}
                    </Link>
                  </>
                )}
              </nav>
            </div>

            {/* Right side */}
            <div className="flex items-center gap-1">
              {/* Language selector dropdown */}
              <div className="relative">
                <button
                  onClick={() => setShowLangMenu(!showLangMenu)}
                  className="flex items-center gap-1 px-2 py-1.5 rounded-full text-text-secondary hover:text-text-primary hover:bg-gray-100 transition-button"
                >
                  <Globe className="w-[15px] h-[15px]" />
                  <span className="text-[13px]">{currentLang}</span>
                  <ChevronDown className="w-3 h-3 text-text-tertiary" />
                </button>

                {showLangMenu && (
                  <>
                    <div className="fixed inset-0 z-40" onClick={() => setShowLangMenu(false)} />
                    <div className="absolute right-0 top-full mt-2 w-40 rounded-card bg-white dark:bg-gray-50 shadow-elevated dark:border dark:border-border py-1 z-50 animate-fade-in">
                      <button
                        onClick={() => handleLangChange('zh')}
                        className={`w-full px-4 py-2.5 text-[13px] text-left hover:bg-gray-100 ${i18n.language === 'zh' ? 'text-accent font-medium' : 'text-text-secondary'}`}
                      >
                        中文
                      </button>
                      <button
                        onClick={() => handleLangChange('en')}
                        className={`w-full px-4 py-2.5 text-[13px] text-left hover:bg-gray-100 ${i18n.language === 'en' ? 'text-accent font-medium' : 'text-text-secondary'}`}
                      >
                        English
                      </button>
                    </div>
                  </>
                )}
              </div>

              {/* Theme toggle */}
              <button
                onClick={toggleTheme}
                className="p-2 rounded-full text-text-secondary hover:text-text-primary hover:bg-gray-100 transition-button"
                aria-label={t('header.theme.toggle')}
              >
                {theme === 'dark' ? <Sun className="w-[15px] h-[15px]" /> : <Moon className="w-[15px] h-[15px]" />}
              </button>

              {isAuthenticated ? (
                <div className="relative">
                  <button
                    onClick={() => setShowMenu(!showMenu)}
                    className="flex items-center gap-2 px-3 py-1.5 rounded-button hover:bg-gray-100 transition-button"
                  >
                    <div className="w-7 h-7 rounded-full bg-accent text-white flex items-center justify-center text-xs font-semibold">
                      {user?.username?.slice(0, 1).toUpperCase() || 'U'}
                    </div>
                    <span className="hidden sm:block text-[13px] text-text-primary max-w-24 truncate">
                      {user?.username || t('header.user.userCenter')}
                    </span>
                    <ChevronDown className="w-3 h-3 text-text-tertiary" />
                  </button>

                  {showMenu && (
                    <>
                      <div className="fixed inset-0 z-40" onClick={() => setShowMenu(false)} />
                      <div className="absolute right-0 top-full mt-2 w-48 rounded-card bg-white dark:bg-gray-50 shadow-elevated dark:border dark:border-border py-1 z-50 animate-fade-in">
                        <Link
                          to="/user"
                          onClick={() => setShowMenu(false)}
                          className="flex items-center gap-2 px-4 py-2.5 text-[13px] text-text-secondary hover:bg-gray-100"
                        >
                          <User className="w-3.5 h-3.5" /> {t('header.user.userCenter')}
                        </Link>
                        <Link
                          to="/settings"
                          onClick={() => setShowMenu(false)}
                          className="flex items-center gap-2 px-4 py-2.5 text-[13px] text-text-secondary hover:bg-gray-100"
                        >
                          <Settings className="w-3.5 h-3.5" /> {t('header.user.settings')}
                        </Link>
                        <hr className="my-1 border-divider dark:border-border" />
                        <button
                          onClick={handleLogout}
                          className="flex items-center gap-2 w-full px-4 py-2.5 text-[13px] text-red hover:bg-red-bg"
                        >
                          <LogOut className="w-3.5 h-3.5" /> {t('header.user.logout')}
                        </button>
                      </div>
                    </>
                  )}
                </div>
              ) : (
                <Link to="/login" className="text-[13px] font-medium text-blue px-4 py-1.5 hover:underline">
                  {t('header.user.login')}
                </Link>
              )}
            </div>
          </div>
        </header>
      );
    }

    export { Header };