/**
 * ドラッグ&ドロップの視覚的フィードバックシステム
 * 包括的なドラッグアンドドロップ体験のためのスタイル定義
 */

/* ===== ドラッグ可能要素の基本スタイル ===== */
.draggable {
    cursor: grab;
    user-select: none;
    transition: all 0.2s ease;
    position: relative;
}

.draggable:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.dark .draggable:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.draggable:active {
    cursor: grabbing;
}

/* ===== ドラッグ中の状態 ===== */
.dragging {
    opacity: 0.8;
    transform: rotate(2deg) scale(1.02);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    pointer-events: none;
}

.dark .dragging {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

/* ドラッグ中の要素の枠線強調 */
.dragging::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border: 2px dashed #475569;
    border-radius: inherit;
    background: rgba(71, 85, 105, 0.1);
    pointer-events: none;
}

.dark .dragging::after {
    border-color: #64748b;
    background: rgba(100, 116, 139, 0.1);
}

/* ===== ドロップゾーンの状態 ===== */
.drop-zone {
    transition: all 0.3s ease;
    border: 2px dashed transparent;
    border-radius: 8px;
    position: relative;
}

/* ドラッグ操作中のドロップゾーン */
.drop-zone-active {
    border-color: #cbd5e1;
    background-color: rgba(241, 245, 249, 0.5);
}

.dark .drop-zone-active {
    border-color: #475569;
    background-color: rgba(55, 65, 81, 0.3);
}

/* ドラッグアイテムがドロップゾーン上にある時 */
.drag-over {
    border-color: #475569 !important;
    background-color: rgba(71, 85, 105, 0.1) !important;
    transform: scale(1.02);
    box-shadow: 0 4px 20px rgba(71, 85, 105, 0.2);
}

.dark .drag-over {
    border-color: #64748b !important;
    background-color: rgba(100, 116, 139, 0.2) !important;
    box-shadow: 0 4px 20px rgba(100, 116, 139, 0.3);
}

/* ===== ドロップゾーンの種類別スタイル ===== */

/* 成功ドロップゾーン */
.drop-zone-success.drag-over {
    border-color: #059669 !important;
    background-color: rgba(16, 185, 129, 0.1) !important;
}

.dark .drop-zone-success.drag-over {
    border-color: #10b981 !important;
    background-color: rgba(16, 185, 129, 0.15) !important;
}

/* 警告ドロップゾーン */
.drop-zone-warning.drag-over {
    border-color: #d97706 !important;
    background-color: rgba(245, 158, 11, 0.1) !important;
}

.dark .drop-zone-warning.drag-over {
    border-color: #f59e0b !important;
    background-color: rgba(245, 158, 11, 0.15) !important;
}

/* 危険ドロップゾーン */
.drop-zone-danger.drag-over {
    border-color: #dc2626 !important;
    background-color: rgba(239, 68, 68, 0.1) !important;
}

.dark .drop-zone-danger.drag-over {
    border-color: #ef4444 !important;
    background-color: rgba(239, 68, 68, 0.15) !important;
}

/* ===== ドラッグプレビュー ===== */
.drag-ghost {
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.9;
    transform: rotate(2deg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border: 2px solid #475569;
    border-radius: 8px;
    background: white;
    padding: 12px;
    max-width: 300px;
}

.dark .drag-ghost {
    background: #374151;
    border-color: #64748b;
    color: #f9fafb;
}

/* ===== ドロップインジケーター ===== */
.drop-indicator {
    position: absolute;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #475569, #64748b);
    border-radius: 2px;
    opacity: 0;
    transform: scaleX(0);
    transition: all 0.2s ease;
    z-index: 10;
}

.drop-indicator.active {
    opacity: 1;
    transform: scaleX(1);
}

.drop-indicator::before,
.drop-indicator::after {
    content: '';
    position: absolute;
    top: -4px;
    width: 8px;
    height: 8px;
    background: #475569;
    border-radius: 50%;
}

.drop-indicator::before {
    left: -4px;
}

.drop-indicator::after {
    right: -4px;
}

/* ===== アニメーション効果 ===== */

/* ドロップ成功アニメーション */
@keyframes dropSuccess {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.drop-success {
    animation: dropSuccess 0.4s ease;
}

/* ドロップ失敗アニメーション */
@keyframes dropError {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.drop-error {
    animation: dropError 0.4s ease;
}

/* 挿入位置のハイライト */
@keyframes insertHighlight {
    0%, 100% { background-color: transparent; }
    50% { background-color: rgba(71, 85, 105, 0.2); }
}

.insert-highlight {
    animation: insertHighlight 0.6s ease infinite;
}

/* ===== ソート可能リストのスタイル ===== */
.sortable-list {
    min-height: 50px;
    position: relative;
}

.sortable-item {
    margin-bottom: 8px;
    transition: all 0.2s ease;
}

.sortable-item.sorting {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.sortable-placeholder {
    background: rgba(71, 85, 105, 0.1);
    border: 2px dashed #cbd5e1;
    margin-bottom: 8px;
    min-height: 60px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64748b;
    font-size: 0.875rem;
    opacity: 0;
    transform: scaleY(0);
    transition: all 0.2s ease;
}

.sortable-placeholder.active {
    opacity: 1;
    transform: scaleY(1);
}

.dark .sortable-placeholder {
    background: rgba(100, 116, 139, 0.1);
    border-color: #475569;
    color: #94a3b8;
}

/* ===== カンバンボードスタイル ===== */
.kanban-column {
    min-height: 500px;
    background: #f8fafc;
    border-radius: 12px;
    padding: 16px;
    transition: all 0.3s ease;
}

.dark .kanban-column {
    background: #1f2937;
}

.kanban-column.drag-over {
    background: rgba(71, 85, 105, 0.05);
    transform: scale(1.02);
}

.dark .kanban-column.drag-over {
    background: rgba(100, 116, 139, 0.1);
}

.kanban-card {
    background: white;
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    cursor: grab;
    transition: all 0.2s ease;
}

.dark .kanban-card {
    background: #374151;
    color: #f9fafb;
}

.kanban-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.kanban-card.dragging {
    opacity: 0.8;
    transform: rotate(2deg) scale(1.02);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* ===== タッチデバイス対応 ===== */
@media (hover: none) and (pointer: coarse) {
    .draggable {
        cursor: default;
    }
    
    .draggable:hover {
        transform: none;
        box-shadow: none;
    }
    
    .dragging {
        transform: scale(1.05);
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
    }
    
    .drag-over {
        transform: none;
    }
    
    .kanban-column.drag-over {
        transform: none;
    }
}

/* ===== アクセシビリティ対応 ===== */
@media (prefers-reduced-motion: reduce) {
    .draggable,
    .drop-zone,
    .sortable-item,
    .kanban-column,
    .kanban-card {
        transition: none;
    }
    
    .dragging,
    .drag-over,
    .sorting {
        transform: none;
    }
    
    .drop-indicator,
    .sortable-placeholder {
        transition: opacity 0.1s ease;
    }
    
    @keyframes dropSuccess,
    @keyframes dropError,
    @keyframes insertHighlight {
        animation: none;
    }
}

/* ===== 高コントラストモード ===== */
@media (prefers-contrast: high) {
    .dragging::after {
        border-width: 3px;
        border-color: #000;
    }
    
    .dark .dragging::after {
        border-color: #fff;
    }
    
    .drop-zone-active {
        border-width: 3px;
        border-color: #000;
    }
    
    .dark .drop-zone-active {
        border-color: #fff;
    }
    
    .drag-over {
        border-width: 3px !important;
        border-color: #000 !important;
    }
    
    .dark .drag-over {
        border-color: #fff !important;
    }
}

/* ===== 印刷時は非表示 ===== */
@media print {
    .dragging,
    .drag-ghost,
    .drop-indicator,
    .sortable-placeholder {
        display: none !important;
    }
}