.qa-1 {
/*    max-width: 500px;*/
    margin: 0 5px 15px 5px;
    border: 1px solid #d6dde3;
    border-radius: 10px;
}

.qa-1 summary {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    padding: 1em 1.5em 1em 3em;
    color: #333333;
    font-weight: bold;
    cursor: pointer;
}
.qa-1 summary::-webkit-details-marker {
    /* Safariで表示されるデフォルトの三角形アイコンを消します */
    display: none;
}

.qa-1 summary::before,
.qa-1 p::before {
    position: absolute;
    left: 1em;
    top: .52em;
    font-weight: bold;
    font-size: 1.3em;
}

.qa-1 summary::before {
    color: #75bbff;
    content: "Q";
}

.qa-1 summary::after {
    transform: translateY(-25%) rotate(45deg);
    min-width: 7px;
    min-height: 7px;
    margin-left: 10px;
    border-bottom: 3px solid #333333b3;
    border-right: 3px solid #333333b3;
    content: '';
    transition: transform .5s;
}

.qa-1[open] summary::after {
    transform: rotate(225deg);
}

.qa-1 p {
    position: relative;
    transform: translateY(-10px);
    opacity: 0;
    margin: 0;
    padding: .3em 3em 1.5em;
    color: #333;
    transition: transform .5s, opacity .5s;
}

.qa-1[open] p {
    transform: none;
    opacity: 1;
}

.qa-1 p::before {
    top: .35em;
    color: #ff8d8d;
    line-height: 1.2;
    content: "A";
}