/**
 * 文件列表组件样式 - SpriteSlice风格
 * @description 简洁现代的卡片式文件管理界面
 */

/* ================================
   CSS变量定义 - 动态卡片大小
   ================================ */
:root {
    --card-size: 150px; /* 可通过JavaScript动态调整 */
    --card-preview-height: calc(var(--card-size) * 0.8); /* 预览区域高度为卡片大小的80% */
}

/* ================================
   文件列表容器
   ================================ */
.file-list {
    margin-top: 0; /* 在右侧面板中不需要顶部边距 */
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: visible; /* 允许内容正常显示 */
    min-height: 200px; /* 设置最小高度 */
}

/* 在右侧面板中的特殊样式 */
.right-panel .file-list {
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: transparent;
    margin-top: 0;
    overflow: visible;
}

.file-list:not(:empty) {
    display: block;
}

.file-list-header {
    width: 100%;
    margin: 0;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

/* ================================
   控制面板
   ================================ */
.selection-controls {
    width: 100%;
    margin: 0;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-light) 100%);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    align-items: center;
    justify-content: center;
    position: relative;
}

.selection-controls::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.selection-controls .control-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-large);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.selection-controls .control-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left 0.5s;
}

.selection-controls .control-btn:hover::before {
    left: 100%;
}

.selection-controls .control-btn:hover {
    background: var(--bg-light);
    border-color: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    color: var(--primary-color);
}

.selection-controls .control-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.selection-info {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: var(--border-radius-large);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    border: 2px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

/* 选择模式相关样式 */
.file-item.selection-mode {
    border: 2px solid var(--border-color);
    background: var(--bg-light);
    transition: all 0.2s ease;
}

.file-item.selection-mode .checkbox-overlay {
    opacity: 1;
    pointer-events: auto;
}

.file-item.selected {
    border-color: var(--accent-color);
    background: rgba(79, 172, 254, 0.05);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.checkbox-overlay {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 24px;
    height: 24px;
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 5;
    cursor: pointer;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.checkbox-overlay::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: transform 0.2s ease;
}

.checkbox-overlay.checked {
    background: var(--primary-color);
    border-color: var(--primary-color);
    opacity: 1;
    transform: scale(1.1);
}

.checkbox-overlay.checked::before {
    transform: translate(-50%, -50%) scale(1);
    background: white;
}

.checkbox-overlay.checked::after {
    content: '✓';
    color: white;
    font-size: 14px;
    font-weight: 900;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

/* ================================
   文件卡片网格
   ================================ */
.file-grid-container {
    padding: var(--spacing-md); /* 减少内边距 */
    width: 100%;
    box-sizing: border-box;
}

.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--card-size), 1fr));
    gap: var(--spacing-md);
    align-items: start;
    justify-content: center;
    width: 100%;
    transition: all 0.3s ease;
}

/* 排序状态下的网格样式 */
.file-grid.sorting {
    gap: calc(var(--spacing-md) * 1.5);
}

.file-grid.sorting .file-item:not(.dragging) {
    transition: all 0.3s ease;
}

/* ================================
   单个文件卡片
   ================================ */
.file-item {
    width: 100%;
    max-width: var(--card-size);
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-large);
    overflow: visible;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.1),
        0 2px 4px -1px rgba(0, 0, 0, 0.06);
    z-index: 1;
    backdrop-filter: blur(10px);
}

.file-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: var(--border-radius-large) var(--border-radius-large) 0 0;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.file-item:hover {
    border-color: var(--primary-light);
    box-shadow: 
        0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04),
        0 0 0 1px rgba(99, 102, 241, 0.1);
    transform: translateY(-8px) scale(1.02);
    z-index: 3;
}

.file-item:hover::before {
    opacity: 1;
}

.file-item.selected {
    border-color: var(--primary-color);
    background: linear-gradient(145deg, #f0f4ff 0%, #e0e7ff 100%);
    box-shadow: 
        0 0 0 3px rgba(99, 102, 241, 0.2),
        0 20px 25px -5px rgba(0, 0, 0, 0.1),
        0 10px 10px -5px rgba(0, 0, 0, 0.04);
    transform: translateY(-6px);
}

.file-item.selected::before {
    opacity: 1;
    background: linear-gradient(90deg, var(--success-color), var(--accent-color));
}

.file-item.dragging {
    opacity: 0.8;
    transform: rotate(8deg) scale(1.1);
    z-index: 100;
    filter: drop-shadow(0 25px 50px rgba(0,0,0,0.25));
    border-color: var(--accent-color);
}

/* 拖拽相关样式 */
.file-item.dragging {
    opacity: 0.6;
    transform: rotate(3deg) scale(1.05);
    z-index: 100; /* 拖拽时最高层级 */
    filter: drop-shadow(0 8px 16px rgba(0,0,0,0.3));
}

.drag-hint {
    position: absolute;
    bottom: -45px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-xl);
    font-size: 0.8rem;
    font-weight: 700;
    white-space: nowrap;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 15;
    pointer-events: none;
    box-shadow: 
        0 10px 15px -3px rgba(0, 0, 0, 0.1),
        0 4px 6px -2px rgba(0, 0, 0, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.drag-hint::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-bottom: 8px solid var(--primary-color);
    filter: drop-shadow(0 -2px 4px rgba(0,0,0,0.1));
}

.file-item:hover .drag-hint,
.file-item.dragging .drag-hint {
    opacity: 1;
    transform: translateX(-50%) translateY(-10px);
}

.file-item.dragging .drag-hint {
    background: linear-gradient(135deg, var(--success-color), var(--accent-color));
}

/* 插入指示器 - 改进版 */
.insert-indicator {
    position: absolute;
    width: 4px;
    height: calc(100% + 20px);
    top: -10px;
    background: linear-gradient(180deg, 
        transparent 0%,
        var(--accent-color) 15%,
        var(--accent-color) 85%,
        transparent 100%
    );
    border-radius: 2px;
    z-index: 50;
    opacity: 0;
    transition: all 0.3s ease;
    box-shadow: 0 0 12px var(--accent-color);
}

.insert-indicator.active {
    opacity: 1;
}

.insert-indicator.left {
    left: -8px;
}

.insert-indicator.right {
    right: -8px;
}

/* 插入指示器动画已移除 */

/* 交换区域高亮 */
.file-item.swap-target {
    background: linear-gradient(135deg, 
        rgba(79, 172, 254, 0.1) 0%,
        rgba(79, 172, 254, 0.2) 50%,
        rgba(79, 172, 254, 0.1) 100%
    );
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 172, 254, 0.3);
}

/* 交换动画已移除 */

/* 拖拽预览幽灵 */
.drag-preview-ghost {
    position: fixed;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.8;
    transform: rotate(5deg);
    filter: drop-shadow(0 10px 20px rgba(0,0,0,0.4));
    transition: transform 0.1s ease;
}

/* 保持向后兼容的file-card类 */
.file-card {
    width: 100%; /* 使用100%宽度，让网格控制实际大小 */
    max-width: var(--card-size); /* 最大宽度由CSS变量控制 */
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.file-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.file-card.selected {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 122, 204, 0.2);
}

.file-card.dragging {
    opacity: 0.5;
    transform: rotate(5deg);
}

/* ================================
   卡片预览区域
   ================================ */
.file-preview-container {
    width: 100%;
    height: var(--card-preview-height);
    position: relative;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-radius: var(--border-radius-large) var(--border-radius-large) 0 0;
    border-bottom: 1px solid var(--border-color);
}

.file-preview {
    max-width: calc(100% - 16px);
    max-height: calc(100% - 16px);
    object-fit: contain;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.file-preview:hover {
    transform: scale(1.08);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.file-header {
    position: absolute;
    top: var(--spacing-xs);
    left: var(--spacing-xs);
    right: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 2;
}

.file-number {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: var(--text-white);
    font-size: 0.75rem;
    font-weight: 700;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    line-height: 1;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

/* ================================
   卡片信息区域
   ================================ */
.file-info {
    padding: var(--spacing-md);
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 0 0 var(--border-radius-large) var(--border-radius-large);
    position: relative;
}

.file-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: var(--spacing-sm);
    right: var(--spacing-sm);
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color), transparent);
}

.file-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
    background: linear-gradient(45deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.file-details {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-size {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
    background: var(--bg-light);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

/* ================================
   帧延时控制
   ================================ */
.frame-delay-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.delay-input-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    justify-content: center;
}

.delay-label {
    font-size: 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    align-self: center;
}

.frame-delay-input {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.75rem;
    text-align: center;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: all 0.2s ease;
    min-width: 50px;
    max-width: 70px;
}

/* 隐藏number input的默认spinner按钮，防止遮挡文字 */
.frame-delay-input::-webkit-outer-spin-button,
.frame-delay-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

/* Firefox浏览器的spinner按钮隐藏 */
.frame-delay-input[type=number] {
    -moz-appearance: textfield;
    appearance: textfield;
}

.frame-delay-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: scale(1.05);
}

.frame-delay-input:hover {
    border-color: var(--primary-light);
}

.frame-delay-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 122, 204, 0.2);
}

.delay-unit {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* 保持兼容的旧类名 */
.frame-delay-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
}

.frame-delay-control label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.frame-delay-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 122, 204, 0.2);
}

/* ================================
   卡片操作按钮
   ================================ */
.card-actions {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: var(--transition);
}

.file-card:hover .card-actions {
    opacity: 1;
}

.card-action-btn {
    width: 24px;
    height: 24px;
    border: none;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.card-action-btn:hover {
    background: var(--bg-primary);
    transform: scale(1.1);
}

/* ================================
   序号标识
   ================================ */
.frame-index {
    position: absolute;
    top: var(--spacing-xs);
    left: var(--spacing-xs);
    background: var(--primary-color);
    color: var(--text-white);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 3px;
    line-height: 1;
    box-shadow: var(--shadow-sm);
}

/* ================================
   空状态
   ================================ */
.file-list-empty {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.file-list-empty-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* ================================
   响应式设计
   ================================ */
@media (max-width: 768px) {
    .file-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
    }
    
    .selection-controls {
        padding: var(--spacing-sm);
        gap: var(--spacing-xs);
    }
    
    .selection-controls .control-btn {
        font-size: 0.7rem;
        padding: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .file-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .selection-controls {
        grid-template-columns: 1fr 1fr;
    }
}

/* ================================
   右侧面板中的文件列表特殊样式
   ================================ */
.right-panel .file-list {
    margin-top: 0;
    border: none;
    border-radius: 0;
    box-shadow: none;
    background: transparent;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0 var(--spacing-xs); /* 添加小的内边距避免滚动条贴边 */
}

/* 简单的空状态提示 */
.file-list-empty-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 20px;
    min-height: 200px;
    color: #666;
    font-size: 14px;
    line-height: 1.5;
}

.file-list-empty-message .icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.file-list-empty-message .title {
    font-weight: 600;
    margin-bottom: 6px;
    color: #333;
}

.file-list-empty-message .hint {
    opacity: 0.8;
}

/* 右侧面板中的文件网格调整 */
.right-panel .file-grid-container {
    padding: var(--spacing-md);
    overflow: visible; /* 允许拖拽提示显示 */
}

.right-panel .file-grid {
    grid-template-columns: repeat(auto-fill, minmax(var(--card-size), 1fr));
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-lg); /* 为拖拽提示留出空间 */
}

.right-panel .file-item {
    width: 100%;
    max-width: var(--card-size); /* 使用CSS变量控制最大宽度 */
}

/* 右侧面板中的选择控制器调整 */
.right-panel .selection-controls {
    padding: var(--spacing-sm) var(--spacing-md);
}

.right-panel .selection-controls .control-btn {
    font-size: 0.8rem;
    padding: var(--spacing-xs) var(--spacing-sm);
}