Accordion / 026 — ドットマーカー

デザイン見本

Minimal styling with dot indicators
Subtle interactions
Clean layout for text content

左側の小さなドットが状態を示すミニマルなデザイン。主張しすぎないデザインで、洗練された印象を与えます。展開時にドットが少し大きくなり、色が濃くなるアニメーション付き。

実装コード

HTML

<div class="container">
    <div class="btn-box">
        <button data-default-text="Dot Marker" data-open-text="Close">Dot Marker</button>
    </div>
    <div class="more">
        <ul>
            <li>Minimal styling with dot indicators</li>
            <li>Subtle interactions</li>
            <li>Clean layout for text content</li>
        </ul>
    </div>
</div>

CSS

.container {
    width: 100%;
}

.container .btn-box button {
    width: 100%;
    padding: 20px 0 20px 24px;
    background: transparent;
    border: none;
    border-bottom: 1px solid #eee;
    font-size: 15px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    position: relative;
}

.container .btn-box button::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background-color: #ccc;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.container .btn-box button:hover {
    color: #333;
}

.container .btn-box button:hover::before {
    background-color: #999;
    transform: translateY(-50%) scale(1.2);
}

.container .btn-box button.active {
    color: #000;
    font-weight: 600;
    border-bottom-color: transparent;
}

.container .btn-box button.active::before {
    background-color: #333;
    transform: translateY(-50%) scale(1.5);
    box-shadow: 0 0 0 3px rgba(51, 51, 51, 0.1);
}

.container .more {
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    background: #fafafa;
    border-radius: 8px;
    opacity: 0;
    transform: translateY(-10px);
}

.container .more.appear {
    max-height: 200px;
    opacity: 1;
    transform: translateY(0);
    margin-bottom: 16px;
}

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

.container .more li {
    padding: 6px 0;
    color: #555;
    font-size: 14px;
    position: relative;
    padding-left: 16px;
}

.container .more li::before {
    content: '-';
    position: absolute;
    left: 0;
    color: #999;
}

document.addEventListener("DOMContentLoaded", () => {
    document.querySelectorAll('.container').forEach(container => {
        const button = container.querySelector('.btn-box button');
        const content = container.querySelector('.more');
        
        if (button && content) {
            button.addEventListener('click', function() {
                content.classList.toggle('appear');
                this.classList.toggle('active');
                
                // ボタンテキストの切り替え
                if (content.classList.contains('appear')) {
                    this.textContent = this.dataset.openText || 'Close';
                } else {
                    this.textContent = this.dataset.defaultText;
                }
            });
        }
    });
});