:root {
    --primary-color: #1f4e6b;
    --secondary-color: #0f172a;
    --accent-color: #2563eb;
    --background-color: #f4f6f8;
    --card-border: #cbd5e1;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: var(--background-color);
    color: var(--secondary-color);
}

header {
    background-color: var(--primary-color);
    color: var(--background-color);
    padding: 1rem 0;
}

#course-title {
    display: block;
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 0.75rem;
}

nav {
    display: flex;
    justify-content: space-evenly;
    background-color: var(--primary-color);
}

nav a {
    color: var(--background-color);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    transition: background-color 0.3s ease;
}

nav a:hover {
    background-color: var(--accent-color);
}

main {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
}

main h1 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.card {
    background-color: var(--background-color);
    border: 1px solid var(--card-border);
    border-radius: 6px;
    overflow: hidden;
}

.card h2 {
    background-color: var(--primary-color);
    color: var(--background-color);
    text-align: center;
    padding: 0.75rem;
    margin: 0;
    font-size: 1.2rem;
}

.card p,
.card ul {
    padding: 1rem;
    margin: 0;
}

.card:first-of-type {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 1rem;
}

.card:first-of-type img {
    width: 100%;
    border-radius: 4px;
    margin: 1rem;
}

.location {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 120px auto;
    gap: 1rem;
    padding: 1rem;
    border-top: 1px solid var(--card-border);
}

.location img {
    width: 100%;
    border: 1px solid var(--card-border);
}

.location small {
    font-style: italic;
    display: block;
    margin-top: 0.25rem;
}

.card ul {
    list-style-type: disc;
    padding-left: 2rem;
}

.card ul li {
    margin-bottom: 0.5rem;
}

.card a {
    color: var(--accent-color);
}

footer {
    background-color: var(--primary-color);
    color: var(--background-color);
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

footer p {
    margin: 0.25rem 0;
    font-size: 0.9rem;
}

#lastModified {
    color: var(--background-color);
    font-size: 0.8rem;
}