*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Courier New', Courier, monospace;
}

:root {
    --primary-color: #000000;
    --secondary-color: #cfcfcf;
    --color-sunday: #ff0000; /* Red */
    --color-monday: #ff7f00; /* Orange */
    --color-tuesday: #ffff00; /* Yellow */
    --color-wednesday: #00ff00; /* Green */
    --color-thursday: #00ffff; /* Cyan */
    --color-friday: #3535ff; /* Blue */
    --color-saturday: #800080; /* Purple */
}

body {
    background-color: var(--primary-color);
    color: var(--secondary-color);
}

.header {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 20px;
    text-align: center;
}

.nav a {
    color: var(--secondary-color);
    text-decoration: none;
    margin: 0 10px;
    padding-bottom: 5px;
    transition: border-bottom-color 0.2s ease;
    border-bottom: 3px solid transparent;
}

.nav a:hover {
    border-bottom-color: var(--secondary-color);
}