:root,
html[data-theme='light'] {
    --background-color: #ffffff;
    --text-color: #222222;
    --header-bg: #f8f9fa;
    --footer-bg: #f8f9fa;
    --toggle-hover-bg: #e9ecef;
    --toggle-icon-fill: #222222;
}

html[data-theme='dark'] {
    --background-color: #121212;
    --text-color: #eeeeee;
    --header-bg: #1e1e1e;
    --footer-bg: #1e1e1e;
    --toggle-hover-bg: #333333;
    --toggle-icon-fill: #eeeeee;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
    margin: 0;
    padding: 1rem;
}