:root {
    --text-color: rgb(64, 78, 106);
    --background-color: rgb(230, 230, 230);
    --heading-font-size: 1.2rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --text-color: rgb(176, 172, 172);
        --background-color: rgb(36, 38, 48);
    }
}

header,
nav {
    font-size: var(--heading-font-size);
}

header {
    margin-top: 2%;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: "Courier New", monospace;
    font-size: 1rem;
    text-align: center;
}

.container {
    padding: 0 2.5rem;
}

nav {
    border-bottom: 1px solid var(--text-color);
    font-size: var(--heading-font-size);
}

nav ul {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 0 0 1.5rem;
    padding: 0;
    list-style-type: none;
}

a {
    color: var(--text-color);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

a:hover {
    text-decoration: underline;
}

a.active {
    font-weight: bold;
}