const translations = {
    ru: {
        title: "VPS Monitoring",
        login: "Вход",
        username: "Логин",
        password: "Пароль",
        loginBtn: "Войти",
        invalidCreds: "Неверный логин или пароль",
        connError: "Ошибка подключения",
        total: "Всего",
        online: "Online",
        offline: "Offline",
        addServer: "+ Добавить сервер",
        refresh: "Обновить",
        settings: "Настройки",
        logout: "Выход",
        serverName: "Название",
        host: "IP / Host",
        sshPort: "Порт SSH",
        sshLogin: "Логин",
        sshPassword: "Пароль",
        description: "Описание",
        add: "Добавить",
        save: "Сохранить",
        cancel: "Отмена",
        auth: "Авторизация",
        newPassword: "Новый пароль",
        leaveEmpty: "Оставьте пустым, чтобы не менять",
        telegram: "Telegram",
        botToken: "Bot Token",
        chatId: "Chat ID",
        monitoring: "Мониторинг",
        pollInterval: "Интервал опроса (сек)",
        cpuThreshold: "Порог CPU (%)",
        ramThreshold: "Порог RAM (%)",
        diskThreshold: "Порог Disk (%)",
        settingsSaved: "Настройки сохранены",
        rebootConfirm: "Перезагрузить сервер?",
        rebootSent: "Команда перезагрузки отправлена",
        deleteConfirm: "Удалить сервер из мониторинга?",
        noServers: "Нет серверов. Нажмите \"+ Добавить сервер\"",
        noData: "Нет данных",
        sshTerminal: "SSH Терминал",
        instructions: "Инструкции",
        quickStart: "Быстрый старт",
        cheatSheet: "Шпаргалка",
        uptime: "Время работы",
        load: "Нагрузка",
        network: "Сеть",
        networkIn: "Входящий",
        networkOut: "Исходящий",
        status: "Статус",
        theme: "Тема",
        language: "Язык",
        dark: "Тёмная",
        light: "Светлая",
        instructions_title: "Инструкции и шпаргалки",
        instr_install: "Установка",
        instr_install_text: "curl -sSL https://raw.githubusercontent.com/andrey271192/vps_monitoring/main/install.sh | bash",
        instr_add_server: "Добавление сервера",
        instr_add_server_text: "Нажмите '+ Добавить сервер', введите IP, логин и пароль SSH",
        instr_ssh: "SSH подключение",
        instr_ssh_text: "Нажмите кнопку 'SSH' на карточке сервера для терминала в браузере",
        instr_telegram: "Telegram бот",
        instr_telegram_text: "Отправьте /start боту. Получайте алерты при проблемах",
        instr_reboot: "Перезагрузка",
        instr_reboot_text: "Через панель: кнопка 'Reboot'. Через бот: Управление → Сервер → Перезагрузить",
        instr_commands: "Команды управления сервисом",
        instr_cmd_status: "systemctl status vps-monitoring",
        instr_cmd_restart: "systemctl restart vps-monitoring",
        instr_cmd_logs: "journalctl -u vps-monitoring -f",
        instr_cmd_update: "cd /opt/vps-monitoring && git pull && systemctl restart vps-monitoring",
        instr_api: "API endpoints",
        instr_thresholds: "Пороги алертов",
        instr_thresholds_text: "Настройки → Мониторинг. По умолчанию: CPU 90%, RAM 90%, Disk 90%",
        tabServers: "Серверы",
        tabPC: "ПК",
    },
    en: {
        title: "VPS Monitoring",
        login: "Login",
        username: "Username",
        password: "Password",
        loginBtn: "Sign In",
        invalidCreds: "Invalid username or password",
        connError: "Connection error",
        total: "Total",
        online: "Online",
        offline: "Offline",
        addServer: "+ Add Server",
        refresh: "Refresh",
        settings: "Settings",
        logout: "Logout",
        serverName: "Name",
        host: "IP / Host",
        sshPort: "SSH Port",
        sshLogin: "Login",
        sshPassword: "Password",
        description: "Description",
        add: "Add",
        save: "Save",
        cancel: "Cancel",
        auth: "Authentication",
        newPassword: "New password",
        leaveEmpty: "Leave empty to keep current",
        telegram: "Telegram",
        botToken: "Bot Token",
        chatId: "Chat ID",
        monitoring: "Monitoring",
        pollInterval: "Poll interval (sec)",
        cpuThreshold: "CPU threshold (%)",
        ramThreshold: "RAM threshold (%)",
        diskThreshold: "Disk threshold (%)",
        settingsSaved: "Settings saved",
        rebootConfirm: "Reboot server?",
        rebootSent: "Reboot command sent",
        deleteConfirm: "Remove server from monitoring?",
        noServers: "No servers. Click \"+ Add Server\"",
        noData: "No data",
        sshTerminal: "SSH Terminal",
        instructions: "Instructions",
        quickStart: "Quick Start",
        cheatSheet: "Cheat Sheet",
        uptime: "Uptime",
        load: "Load",
        network: "Network",
        networkIn: "In",
        networkOut: "Out",
        status: "Status",
        theme: "Theme",
        language: "Language",
        dark: "Dark",
        light: "Light",
        instructions_title: "Instructions & Cheat Sheet",
        instr_install: "Installation",
        instr_install_text: "curl -sSL https://raw.githubusercontent.com/andrey271192/vps_monitoring/main/install.sh | bash",
        instr_add_server: "Adding a server",
        instr_add_server_text: "Click '+ Add Server', enter IP, SSH login and password",
        instr_ssh: "SSH connection",
        instr_ssh_text: "Click 'SSH' button on server card for browser terminal",
        instr_telegram: "Telegram bot",
        instr_telegram_text: "Send /start to the bot. Get alerts when issues arise",
        instr_reboot: "Reboot",
        instr_reboot_text: "Panel: 'Reboot' button. Bot: Manage → Server → Reboot",
        instr_commands: "Service management commands",
        instr_cmd_status: "systemctl status vps-monitoring",
        instr_cmd_restart: "systemctl restart vps-monitoring",
        instr_cmd_logs: "journalctl -u vps-monitoring -f",
        instr_cmd_update: "cd /opt/vps-monitoring && git pull && systemctl restart vps-monitoring",
        instr_api: "API endpoints",
        instr_thresholds: "Alert thresholds",
        instr_thresholds_text: "Settings → Monitoring. Default: CPU 90%, RAM 90%, Disk 90%",
        tabServers: "Servers",
        tabPC: "PC",
    }
};

let currentLang = localStorage.getItem('vps_lang') || 'ru';

function t(key) {
    return translations[currentLang]?.[key] || translations['en']?.[key] || key;
}

function setLang(lang) {
    currentLang = lang;
    localStorage.setItem('vps_lang', lang);
    document.documentElement.lang = lang;
    if (typeof renderPage === 'function') renderPage();
}

function toggleLang() {
    setLang(currentLang === 'ru' ? 'en' : 'ru');
}