ダイアログボックス：フローティング｜Dialog Box: Floating

<div class="container">
    <div id="dialog-container">
        <button id="dialog-btn">Floating Card<br>Dialog</button>     
    </div>

    <!-- Dialog Window -->
    <div id="dialog" class="dialog">
        <div class="dialog-content">
            <div class="floating-header">
                <div class="floating-icon">✨</div>
                <span>Floating Card Dialog</span>
            </div>
            <div class="floating-body">
                <p>This dialog features a floating card design with subtle animations and elegant shadows. Perfect for modern web applications.</p>
            </div>
            <div class="floating-footer">
                <button class="floating-btn-secondary">Cancel</button>
                <button class="floating-btn-primary">Confirm</button>
            </div>
        </div>
    </div>
</div>

/* ダイアログコンテナスタイル */
#dialog-container {
    text-align: center;
    padding: 50px 20px;
}

/* ダイアログボタンスタイル */
#dialog-btn {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    min-width: 200px;
    min-height: 60px;
    display: inline-block;
    text-align: center;
    line-height: 1.4;
    vertical-align: middle;
}

#dialog-btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

/* ダイアログオーバーレイスタイル */
.dialog {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

/* ダイアログコンテンツスタイル */
.dialog-content {
    width: 80%;
    max-width: 500px;
    margin: 8% auto;
    animation: slideInFromTop 0.2s ease-out;
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.15),
        0 8px 25px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.8);
    overflow: hidden;
    transform: translateY(20px);
    animation: floatIn 0.6s ease-out forwards;
    position: relative;
}

.dialog-content::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4, #45b7d1, #96ceb4);
    border-radius: 22px;
    z-index: -1;
    opacity: 0.3;
    animation: borderGlow 3s ease-in-out infinite alternate;
}

@keyframes floatIn {
    0% {
        transform: translateY(50px) scale(0.9);
        opacity: 0;
    }
    100% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

@keyframes borderGlow {
    0% { opacity: 0.3; }
    100% { opacity: 0.6; }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* フローティングヘッダー */
.floating-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 25px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.floating-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    animation: shimmer 3s infinite;
}

.floating-icon {
    font-size: 32px;
    margin-bottom: 10px;
    display: block;
    animation: bounce 2s infinite;
}

.floating-header span {
    font-size: 20px;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

/* フローティングボディ */
.floating-body {
    padding: 30px 20px;
    background: #ffffff;
    position: relative;
}

.floating-body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20px;
    right: 20px;
    height: 1px;
    background: linear-gradient(90deg, transparent, #e0e0e0, transparent);
}

.floating-body p {
    margin: 0;
    line-height: 1.7;
    color: #555;
    font-size: 16px;
    text-align: center;
}

/* フローティングフッター */
.floating-footer {
    padding: 20px;
    display: flex;
    gap: 15px;
    justify-content: center;
    background: #f8f9fa;
    border-top: 1px solid #e9ecef;
}

.floating-btn-secondary {
    background: transparent;
    color: #6c757d;
    border: 2px solid #6c757d;
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.floating-btn-secondary:hover {
    background: #6c757d;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 117, 125, 0.3);
}

.floating-btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 25px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.floating-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* アニメーション */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInFromTop {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .dialog-content {
        width: 90%;
        margin: 15% auto;
        padding: 15px;
    }
    
    .floating-header span {
        font-size: 16px;
    }
    
    .floating-body p {
        font-size: 14px;
    }
}

// フローティングカードダイアログの機能
document.addEventListener('DOMContentLoaded', function() {
    // ダイアログボタンのイベントリスナーを設定
    const dialogBtn = document.getElementById('dialog-btn');
    const dialog = document.getElementById('dialog');
    
    dialogBtn.addEventListener('click', function() {
        dialog.style.display = 'block';
        // スクロールを無効化
        document.body.style.overflow = 'hidden';
    });
    
    // 閉じるボタンのイベントリスナーを設定
    const closeButtons = document.querySelectorAll('.floating-btn-secondary, .floating-btn-primary');
    
    closeButtons.forEach(button => {
        button.addEventListener('click', function() {
            dialog.style.display = 'none';
            // スクロールを有効化
            document.body.style.overflow = 'auto';
        });
    });
});