html {
    background-color: #FAF9F6;
}

body {
    max-width: 64rem;
    margin: 0 auto;
    padding: 1rem;
}

h2 {
    margin-top: 3rem;
}

summary {
    list-style: none;
    display: flex;
    align-items: center;
    cursor: pointer;
}

summary::after {
    content: "+";
    margin-left: auto;
}

details[open] > summary::after {
    content: "−";
}

details {
    margin: 0 0.5rem;
}

.summary-date {
    padding-right: 2rem;
}

.link-group {
    margin-top: 1.5rem;
}

.link-group:first-of-type {
    margin-top: 1rem;
}

.link-group h4 {
    margin: 0 0 0.5rem 0;
    font-size: 1rem;
    font-weight: 600;
}