:root {
    --bg-color: #111;
    --text-color: #fff;
    --header-bg: #000;
    --footer-bg: #222;
}

.light-mode {
    --bg-color: #fff;
    --text-color: #111;
    --header-bg: #f8f8f8;
    --footer-bg: #ddd;
}

.dark-mode {
    --bg-color: #111;
    --text-color: #fff;
    --header-bg: #000;
    --footer-bg: #222;
}
body {
    background: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    font-family: Arial, sans-serif;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    position: sticky;
    top: 0;
    background: var(--header-bg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    z-index: 1000;
}

.menu a {
    color: var(--text-color);
    margin-left: 20px;
    text-decoration: none;
}

.menu a:hover {
    text-decoration: underline;
}

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 20px;
    cursor: pointer;
}

.footer {
    background: var(--footer-bg);
    padding: 20px 0;
    text-align: center;
    margin-top: 20px;
}