Accordion / 033 — パステルカード

デザイン見本

Soft Pastel Color Palette
Smooth Rounded Design
Light & Airy Feel

ラベンダー〜ピンクのパステルグラデーション背景が柔らかい印象のデザインです。コンテンツ開閉時の `▾` 回転に `cubic-bezier(0.34, 1.56, 0.64, 1)` を使用し、バネのような弾む動きを演出します。SNS投稿・レビュー・美容系コンテンツとの相性が特に良いデザインです。

実装コード

HTML

<div class="container">
    <div class="btn-box">
        <button data-default-text="Soft &amp; Gentle Pastel" data-open-text="Close">Soft &amp; Gentle Pastel</button>
    </div>
    <div class="more">
        <ul>
            <li>Soft Pastel Color Palette</li>
            <li>Smooth Rounded Design</li>
            <li>Light &amp; Airy Feel</li>
        </ul>
    </div>
</div>

CSS

.container {
    background: linear-gradient(135deg, #fce4ec, #f3e5f5, #e8eaf6);
    border-radius: 20px;
    padding: 4px;
}

.container .btn-box button {
    width: 100%;
    padding: 18px 24px;
    background: rgba(255, 255, 255, 0.85);
    border: none;
    border-radius: 16px;
    font-size: 14px;
    font-weight: 600;
    color: #7c5cbf;
    cursor: pointer;
    transition: background 0.3s, box-shadow 0.3s;
    text-align: left;
    position: relative;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    box-shadow: 0 2px 12px rgba(124, 92, 191, 0.12);
}

.container .btn-box button::after {
    content: '▾';
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    color: #c9a0e8;
    font-size: 18px;
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.container:has(.more.appear) .btn-box button::after {
    transform: translateY(-50%) rotate(180deg);
    color: #9b59b6;
}

.container .btn-box button:hover {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 20px rgba(124, 92, 191, 0.2);
}

.container .more {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
    background: rgba(255, 255, 255, 0.6);
    border-radius: 0 0 16px 16px;
    margin-top: -4px;
    padding-top: 4px;
}

.container .more.appear {
    max-height: 200px;
}

.container .more ul {
    list-style: none;
    padding: 16px 24px 20px;
    margin: 0;
}

.container .more li {
    padding: 8px 0 8px 16px;
    color: #9c7abf;
    font-size: 13px;
    border-bottom: 1px solid rgba(124, 92, 191, 0.1);
    position: relative;
}

.container .more li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: linear-gradient(135deg, #e091c5, #9b87e8);
    border-radius: 50%;
}

.container .more li:last-child {
    border-bottom: none;
}

(function () {
    var container = document.querySelector('.container');
    if (!container) return;
    var button = container.querySelector('.btn-box button');
    var content = container.querySelector('.more');

    if (button && content) {
        button.addEventListener('click', function () {
            content.classList.toggle('appear');

            if (content.classList.contains('appear')) {
                this.textContent = this.dataset.openText || 'Close';
            } else {
                this.textContent = this.dataset.defaultText;
            }
        });
    }
})();