Accordion / 030 — オーロラリキッド

HTML Copy

<div class="container">
    <div class="btn-box">
        <button data-default-text="Aurora Liquid Flow" data-open-text="Close">Aurora Liquid Flow</button>
    </div>
    <div class="more">
        <ul>
            <li>Animated Gradient Background</li>
            <li>Fluid and Liquid Motion</li>
            <li>Beautiful Color Transitions</li>
        </ul>
    </div>
</div>

CSS Copy

@keyframes acc-auroraFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.container {
    margin-bottom: 0;
    max-width: 100%;
    padding: 4px;
    background: linear-gradient(270deg, #ff9a9e, #fecfef, #a1c4fd, #c2e9fb);
    background-size: 300% 300%;
    animation: acc-auroraFlow 8s ease infinite;
    border-radius: 16px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.container .btn-box button {
    width: 100%;
    padding: 18px 24px;
    background: rgba(255, 255, 255, 0.85);
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 700;
    color: #444;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    z-index: 2;
}

.container .btn-box button::before {
    content: '+';
    position: absolute;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    font-weight: 300;
    color: #888;
    transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.container:has(.more.appear) .btn-box button::before {
    transform: translateY(-50%) rotate(135deg);
    color: #ff9a9e;
}

.container .btn-box button:hover {
    background: rgba(255, 255, 255, 0.95);
}

.container .more {
    max-height: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 0 0 12px 12px;
    margin-top: -12px;
    padding-top: 12px;
    opacity: 0;
    transform: translateY(-10px);
}

.container .more.appear {
    max-height: 300px;
    opacity: 1;
    transform: translateY(0);
}

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

.container .more li {
    padding: 12px 0;
    color: #555;
    border-bottom: 1px solid rgba(255, 255, 255, 0.6);
    font-size: 14px;
    font-weight: 500;
    position: relative;
    padding-left: 20px;
}

.container .more li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: linear-gradient(135deg, #a1c4fd, #c2e9fb);
}

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

JS Copy

(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;
            }
        });
    }
})();