.course-list,
.resource-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 2);
}

.course,
.resource {
    background: var(--gray-light);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: 8px;
    border: 1px solid var(--gray-border);
}

.course h4,
.resource h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-unit);
}

.course-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-bottom: var(--spacing-unit);
}

.course-level,
.course-dept {
    font-size: 0.875rem;
    color: var(--text-light);
}

.course-level {
    font-weight: 500;
}

.course-description {
    color: var(--text-dark);
    margin-bottom: var(--spacing-unit);
}

.course-links,
.book-links {
    display: flex;
    gap: var(--spacing-unit);
    flex-wrap: wrap;
}

.course-links a,
.book-links a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
}

.course-links a:hover,
.book-links a:hover {
    text-decoration: underline;
}

.book-list {
    list-style: none;
}

.book-list li {
    margin-bottom: calc(var(--spacing-unit) * 2);
    padding-bottom: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--gray-border);
}

.book-list li:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.book-list h5 {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.book-list p {
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.errata-note {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    font-style: italic;
}

.info-list {
    list-style-position: inside;
    color: var(--text-dark);
}

.info-list li {
    margin-bottom: 0.5rem;
}

section {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

section h3 {
    color: var(--primary-color);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

@media (max-width: 768px) {
    .course-list,
    .resource-list {
        grid-template-columns: 1fr;
    }
}