section {
    max-width: 1200px;
    padding: 0 10px;
    margin: 10px auto;
}

details {
    background: #fefefe;
    margin: 5px auto;
}

summary {
    display: grid;
    grid-template-columns: 1fr 24px;
    gap: 6px;
    align-items: center;
    padding: 16px 2px;
    border: 2px solid #ddd;
    border-radius: 8px;
    cursor: default;
}

summary::marker {
    content: "";
}

summary::-webkit-details-marker {
    display: none;
}

.arrow {
    display: inline-block;
    vertical-align: middle;
    color: #333;
    line-height: 1;
    width: 1em;
    height: 1em;
    border: 0.1em solid currentColor;
    border-left: 0;
    border-bottom: 0;
    box-sizing: border-box;
    transform: translateY(-25%) rotate(135deg);
    transition: transform 0.4s;
}

details[open] .arrow {
    transform: translateY(25%) rotate(-45deg);
}

details[open].closing .arrow {
    transform: translateY(-25%) rotate(135deg);
}

.answer {
    padding: 5px 10px;
    border: 2px solid #ddd;
    border-top: none;
    border-radius: 8px;
    overflow: hidden;
    cursor: default;
    margin-top: -2px;
}