@media (min-width: 40em) {
    main {
        margin: 4em;
    }
}

details.program:first-child {
    border-top: 1px solid black;
}

details.program {
    position: relative;
    width: 100%;
    border-bottom: 1px solid black;
}

details.program > summary {
    display: grid;
    grid-template-columns: 4fr 5fr 4em;
    line-height: 2em;
    list-style: none;
    cursor: pointer;
}
details.program > summary::-webkit-details-marker {
    display: none;
}

details.program > summary > .name {
    margin-left: 2em;
    font-weight: bold;
    color: #2f5597;
}

details.program[open] > summary > .name,
details.program[open] > summary > .composers {
    color: var(--gold);
}

details.program > summary > img.button {
    display: block;
    width: 2em;
    margin: auto 1em;
}
details.program > summary > img.button.close,
details.program[open] > summary > img.button.open {
    display: none;
}
details.program[open] > summary > img.button.close {
    display: block;
    position: absolute;
    bottom: 0;
    right: 0;
}

details.program > summary ~ * {
    margin-left: 2em;
}