よくある質問セクションのアコーディオンを作成！HTMLとCSSのみ！【JavaScirptなし】

<div class="faq__list">
	<div class="faq__item">
		<input type="checkbox" id="faq1" class="faq__checkbox">
		<label for="faq1" class="faq-q">
			<div class="faq__mark">Q1</div>
			<div class="faq-q__txt">質問テキスト質問テキスト質問テキスト質問テキスト？</div>
			<div class="faq_toggle">
				<span></span>
				<span></span>
			</div>
		</label>
		<div class="faq-a">
			<div class="faq__mark">A1</div>
			<div class="faq-a__content">
				<p>回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト</p>
			</div>
		</div>
	</div>
	<div class="faq__item">
		<input type="checkbox" id="faq2" class="faq__checkbox">
		<label for="faq2" class="faq-q">
			<div class="faq__mark">Q2</div>
			<div class="faq-q__txt">質問テキスト質問テキスト質問テキスト質問テキスト質問テキスト質問テキスト質問テキスト？</div>
			<div class="faq_toggle">
				<span></span>
				<span></span>
			</div>
		</label>
		<div class="faq-a">
			<div class="faq__mark">A2</div>
			<div class="faq-a__content">
				<p>回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト</p>
			</div>
		</div>
	</div>
	<div class="faq__item">
		<input type="checkbox" id="faq3" class="faq__checkbox">
		<label for="faq3" class="faq-q">
			<div class="faq__mark">Q3</div>
			<div class="faq-q__txt">質問テキスト質問テキスト質問テキスト質問テキスト質問テキスト？</div>
			<div class="faq_toggle">
				<span></span>
				<span></span>
			</div>
		</label>
		<div class="faq-a">
			<div class="faq__mark">A3</div>
			<div class="faq-a__content">
				<p>回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト回答テキスト</p>
			</div>
		</div>
	</div>
</div>

.faq__list {
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}
.faq__checkbox {
    display: none;
}
.faq__item {
    border-bottom: 1px solid #ddd;
}
.faq-q {
    position: relative;
    padding: 15px;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s;
}
.faq-q__txt {
    flex-grow: 1;
    font-weight: 700;
}

.faq__mark {
    width: 40px;
    height: 40px;
    line-height: 40px;
    color: #fff;
    font-weight: 700;
    border-radius: 50%;
    margin-right: 10px;
    text-align: center;
    flex-shrink: 0;
}
.faq-q .faq__mark {
    background-color: #007bff; 
}
.faq-a .faq__mark {
    background-color: #dc3545;
}

.faq_toggle {
    width: 50px;
    height: 50px;
    position: relative;
    transition: all 0.3s;
    flex-shrink: 0;
}
.faq_toggle span {
    display: inline-block;
    position: absolute;
    transition: all 0.3s;
    background-color: #191919;
}
.faq_toggle span:nth-of-type(1) {
    width: 30px;
    height: 4px;
    top: 23px;
    left: 10px;
}
.faq_toggle span:nth-of-type(2) {
    width: 4px;
    height: 30px;
    top: 10px;
    left: 23.5px;
}
.faq__checkbox:checked + .faq-q .faq_toggle {
    transform: rotate(90deg);
}
.faq__checkbox:checked + .faq-q .faq_toggle span:nth-of-type(1) {
    opacity: 0;
    transform: rotate(90deg);
}

.faq-a {
    padding: 15px;
    background-color: #f7f7f7;
    display: none;
}
.faq-a__content {
    margin-top: 10px;
}
.faq__checkbox:checked + .faq-q + .faq-a {
    display: block;
}
@media screen and (min-width: 768px) {
    .faq-q:hover {
        background-color: #f0f0f0;
    }
}
@media screen and (max-width: 480px) {
    .content .faq__list .faq-q__txt {
        margin-top: 10px;
    }
    .faq__list {
        padding: 0;
        box-shadow: none;
    }
    .faq-q {
        flex-wrap: wrap;
    }
    .faq-q__txt {
        margin-top: 10px;
    }
    .faq_toggle {
        position: absolute;
        top: 10px;
        right: 0;
    }
}