Dialog / 28 ペーパーフォールド

デザイン見本

Paper Fold Dialog

紙がパタパタと広がるような3Dアニメーションを持つダイアログです。

紙や手紙を意識したクリーンな白背景のデザイン。表示される際に `perspective` と `rotateX` を用いて、上から下に折り紙がパタパタと展開されるような3Dフォールドアニメーションを実装しています。

実装コード

HTML

<button id="dialog-btn-28">Paper Fold<br>Dialog</button>
<div id="dialog-28" class="dialog">
    <div class="dialog-content-28">
        <div class="paper-header">
            <span>Paper Fold Dialog</span>
        </div>
        <div class="paper-body">
            <p>紙がパタパタと広がるような3Dアニメーションを持つダイアログです。</p>
        </div>
        <div class="paper-footer">
            <button class="close-btn-28">Discard</button>
            <button class="close-btn-28 primary">Save</button>
        </div>
    </div>
</div>

CSS

#dialog-btn-28 {
    background-color: #fff;
    color: #333;
    border: 1px solid #ddd;
    padding: 12px 24px;
    border-radius: 2px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    min-width: 200px;
    min-height: 60px;
    display: block;
    margin: 0 auto;
    text-align: center;
    box-shadow: 2px 4px 10px rgba(0,0,0,0.05);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}
#dialog-btn-28::after {
    content: '';
    position: absolute;
    bottom: 0; right: 0;
    width: 0; height: 0;
    border-style: solid;
    border-width: 0 0 15px 15px;
    border-color: transparent transparent #ccc #eee;
    transition: all 0.3s;
}
#dialog-btn-28:hover {
    box-shadow: 2px 6px 15px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}
#dialog-btn-28:hover::after {
    border-width: 0 0 20px 20px;
}

#dialog-28 {
    display: none;
    position: fixed;
    z-index: 2147483647;
    left: 0; top: 0; width: 100%; height: 100%;
    background-color: rgba(200, 200, 200, 0.6);
    perspective: 1000px;
    animation: fadeIn-28 0.3s;
}

.dialog-content-28 {
    background: #fff;
    width: 80%;
    max-width: 450px;
    margin: 10% auto;
    position: relative;
    padding: 40px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    transform-origin: top center;
    animation: paperFoldOut-28 0.6s cubic-bezier(0.25, 1, 0.5, 1) forwards;
}
/* 紙の折り目エフェクト（簡略化） */
.dialog-content-28::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to bottom, rgba(0,0,0,0.02) 0%, rgba(255,255,255,0) 10%, rgba(255,255,255,0) 90%, rgba(0,0,0,0.02) 100%);
    pointer-events: none;
}

.paper-header {
    margin-bottom: 25px;
    border-bottom: 1px dashed #ccc;
    padding-bottom: 15px;
}
.paper-header span {
    font-size: 22px;
    font-weight: 600;
    color: #444;
    font-family: 'Georgia', serif;
}
.paper-body p {
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 30px;
    color: #555;
}

.paper-footer {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    padding-top: 20px;
    border-top: 1px dotted #e0e0e0;
}

.close-btn-28 {
    background: transparent;
    color: #666;
    border: none;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 14px;
    transition: color 0.2s;
}
.close-btn-28.primary {
    background: #f0f0f0;
    color: #333;
    border-radius: 2px;
}
.close-btn-28:hover {
    color: #000;
}
.close-btn-28.primary:hover {
    background: #e4e4e4;
}

@keyframes fadeIn-28 {
    from { opacity: 0; } to { opacity: 1; }
}
@keyframes paperFoldOut-28 {
    0% { transform: rotateX(-90deg) scaleY(0); opacity: 0; }
    50% { transform: rotateX(10deg) scaleY(1.1); }
    100% { transform: rotateX(0deg) scaleY(1); opacity: 1; }
}

@media (max-width: 768px) {
    .dialog-content-28 { width: 90%; padding: 25px; }
}

(function () {
    var btn = document.getElementById('dialog-btn-28');
    var dialog = document.getElementById('dialog-28');
    var closeBtns = dialog.querySelectorAll('.close-btn-28');

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