Dialog / 30 モーフィング

デザイン見本

Morphing Dialog

小さな点（円）から長方形のカードへシームレスに変形するデザインです。

`border-radius` とサイズ要素（width / height）をアニメーション操作し、点や小さな円から長方形のダイアログカードへとシームレスにトランスフォーム（変形）して展開する、モーフィングアニメーションを搭載したデザインです。

実装コード

HTML

<button id="dialog-btn-30">Morphing<br>Dialog</button>
<div id="dialog-30" class="dialog">
    <div class="dialog-content-30">
        <div class="morph-inner">
            <div class="morph-header">
                <span>Morphing Dialog</span>
            </div>
            <div class="morph-body">
                <p>小さな点（円）から長方形のカードへシームレスに変形するデザインです。</p>
            </div>
            <div class="morph-footer">
                <button class="close-btn-30">Got it</button>
            </div>
        </div>
    </div>
</div>

CSS

#dialog-btn-30 {
    background-color: #833ab4;
    background: linear-gradient(to right, #fcb045, #fd1d1d, #833ab4);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    min-width: 200px;
    min-height: 60px;
    display: block;
    margin: 0 auto;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}
#dialog-btn-30:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(253, 29, 29, 0.3);
}

#dialog-30 {
    display: none;
    position: fixed;
    z-index: 2147483647;
    left: 0; top: 0; width: 100%; height: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    animation: fadeIn-30 0.3s;
}

.dialog-content-30 {
    background: #fff;
    width: 80%;
    max-width: 400px;
    margin: 10% auto;
    position: relative;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(0,0,0,0.1);
    /* モーフィングの中核：border-radiusとサイズのキーフレーム展開 */
    animation: morphExpand-30 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

.morph-inner {
    opacity: 0;
    animation: fadeInContent-30 0.4s ease forwards;
    animation-delay: 0.6s;
}

.morph-header {
    margin-bottom: 20px;
}
.morph-header span {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(to right, #fcb045, #fd1d1d, #833ab4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.morph-body p {
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 30px;
    color: #444;
}

.morph-footer {
    display: flex;
    justify-content: center;
}

.close-btn-30 {
    background: linear-gradient(to right, #fcb045, #fd1d1d, #833ab4);
    color: white;
    border: none;
    padding: 10px 30px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 15px;
    font-weight: bold;
    transition: filter 0.3s;
}
.close-btn-30:hover {
    filter: brightness(1.1);
}

@keyframes fadeIn-30 {
    from { opacity: 0; } to { opacity: 1; }
}
@keyframes morphExpand-30 {
    0% { 
        width: 10px; padding: 0; height: 10px; 
        border-radius: 50%; opacity: 0; 
        background: #fd1d1d;
    }
    40% {
        width: 100px; padding: 0; height: 100px; 
        border-radius: 50%; opacity: 1;
        background: #fff;
    }
    100% { 
        width: 80%; padding: 40px 30px; height: auto; 
        border-radius: 12px; opacity: 1; 
        background: #fff;
    }
}
@keyframes fadeInContent-30 {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .dialog-content-30 { width: 90%; }
}

(function () {
    var btn = document.getElementById('dialog-btn-30');
    var dialog = document.getElementById('dialog-30');
    var closeBtns = dialog.querySelectorAll('.close-btn-30');

    if (!btn || !dialog) return;

    function openDialog() {
        dialog.style.display = 'block';
        document.body.style.overflow = 'hidden';
    }

    function closeDialog() {
        dialog.style.display = 'none';
        document.body.style.overflow = 'auto';
    }

    btn.addEventListener('click', openDialog);
    
    closeBtns.forEach(function(b) { b.addEventListener('click', closeDialog); });

    dialog.addEventListener('click', function (e) {
        if (e.target === dialog) {
            closeDialog();
        }
    });

    document.addEventListener('keydown', function (e) {
        if (e.key === 'Escape' && dialog.style.display === 'block') {
            closeDialog();
        }
    });
})();