function toggleTheme() {
    const body = document.body;
    const btn = document.getElementById('toggle-theme');
    body.classList.toggle('light-mode');

    if (body.classList.contains('light-mode')) {
        btn.textContent = '🌙';
        localStorage.setItem('theme', 'light');
    } else {
        btn.textContent = '☀️';
        localStorage.setItem('theme', 'dark');
    }
}

(function() {
    const theme = localStorage.getItem('theme');
    const btn = document.getElementById('toggle-theme');
    if (theme === 'light') {
        document.body.classList.add('light-mode');
        if (btn) btn.textContent = '🌙';
    }
})();