/* 文档树结构 */
.document-tree {
    width: 100%;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Tab页签头部样式 */
.tree-tabs {
    display: flex;
    margin-bottom: 12px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(226, 232, 240, 0.8);
    border-radius: 8px 8px 0 0;
    overflow: hidden;
}

.tree-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    position: relative;
    border-right: 1px solid rgba(226, 232, 240, 0.8);
    background: rgba(248, 250, 252, 0.5);
}

.tree-tab:last-child {
    border-right: none;
}

.tree-tab:hover {
    background: rgba(59, 130, 246, 0.08);
    transform: translateY(-1px);
}

.tree-tab.active {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(147, 197, 253, 0.15) 100%);
    border-bottom: 2px solid #007aff;
    color: #007aff;
}

.tree-tab .tree-icon {
    font-size: 16px;
    color: #64748b;
    transition: color 0.2s;
}

.tree-tab.active .tree-icon {
    color: #007aff;
}

.tree-tab .tree-title {
    font-size: 14px;
    font-weight: 600;
    color: #64748b;
    transition: color 0.2s;
}

.tree-tab.active .tree-title {
    color: #007aff;
}

/* Tab内容区域样式 */
.tree-tab-content {
    flex: 1;
    display: none;
    flex-direction: column;
    min-height: 0;
}

.tree-tab-content.active {
    display: flex;
}

.tree-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    padding: 8px 12px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(147, 197, 253, 0.1) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    position: relative;
}

.tree-header:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(147, 197, 253, 0.15) 100%);
    border-color: rgba(59, 130, 246, 0.3);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.tree-header::after {
    content: "";
    position: absolute;
    right: 12px;
    font-size: 11px;
    color: rgba(59, 130, 246, 0.7);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.tree-header:hover::after {
    opacity: 1;
}

.tree-header .tree-icon {
    font-size: 16px;
    color: #007aff;
    transition: color 0.2s;
}

.tree-header.collapsed .tree-icon {
    color: #64748b;
}

.tree-title {
    font-size: 14px;
    font-weight: 600;
    color: #007aff;
}

.tree-container {
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(226, 232, 240, 0.8);
    border-radius: 8px;
    padding: 12px;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overflow-x: auto;
}

/* 树节点样式 */
.tree-node {
    margin: 1px 0;
}

.tree-node-content {
    display: flex;
    align-items: center;
    padding: 6px 8px;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 13px;
    position: relative;
    border: 1px solid transparent;
    width: fit-content;
    min-width: 100%;
}

.tree-node-content:hover {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(147, 197, 253, 0.08) 100%);
    border-color: rgba(59, 130, 246, 0.2);
    transform: translateX(2px);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.1);
}

.tree-node-content.active {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15) 0%, rgba(147, 197, 253, 0.15) 100%);
    border: 1px solid rgba(59, 130, 246, 0.4);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
    transform: translateX(4px);
}

/* 展开/折叠图标 */
.expand-icon {
    width: 16px;
    height: 16px;
    margin-right: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    border-radius: 2px;
    position: relative;
    flex-shrink: 0;
}

.expand-icon:hover {
    background: rgba(59, 130, 246, 0.1);
}

.expand-icon::before {
    content: '';
    width: 0;
    height: 0;
    border-left: 5px solid #64748b;
    border-top: 3px solid transparent;
    border-bottom: 3px solid transparent;
    transition: all 0.2s ease;
}

.expand-icon.expanded::before {
    transform: rotate(90deg);
    border-left: 3px solid #64748b;
    border-right: 3px solid transparent;
    border-top: 5px solid #64748b;
    border-bottom: 0;
}

.expand-icon.empty {
    /* visibility: hidden; */
    display: none;
}

/* 文档图标 */
.doc-icon {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    flex-shrink: 0;
}

/* 文件夹图标 */
.doc-icon.folder {
    color: #007aff;
}

.doc-icon.folder::before {
    content: '';
    width: 14px;
    height: 11px;
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    border-radius: 2px 2px 1px 1px;
    position: relative;
    box-shadow: 0 1px 3px rgba(59, 130, 246, 0.3);
}

.doc-icon.folder::after {
    content: '';
    position: absolute;
    top: 1px;
    left: 1px;
    width: 5px;
    height: 2px;
    background: linear-gradient(135deg, #93c5fd 0%, #60a5fa 100%);
    border-radius: 1px 1px 0 0;
}

/* 普通文件图标 */
.doc-icon.file {
    color: #64748b;
}

.doc-icon.file::before {
    content: '';
    width: 10px;
    height: 13px;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    border: 1px solid #cbd5e1;
    border-radius: 1px;
    position: relative;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.doc-icon.file::after {
    content: '';
    position: absolute;
    top: 1px;
    right: 1px;
    width: 3px;
    height: 3px;
    background: #cbd5e1;
    clip-path: polygon(0 0, 100% 100%, 0 100%);
}

/* 可编辑文件图标 - 浅蓝色简洁设计 */
.doc-icon.file-edit {
    color: #67c3f3;
}

.doc-icon.file-edit::before {
    content: '';
    width: 11px;
    height: 13px;
    background: linear-gradient(135deg, #e0f4ff 0%, #bae6fd 100%);
    border: 1px solid #67c3f3;
    border-radius: 2px;
    position: relative;
    box-shadow: 0 1px 3px rgba(103, 195, 243, 0.2);
}

.doc-icon.file-edit::after {
    content: '';
    position: absolute;
    top: 2px;
    right: 2px;
    width: 3px;
    height: 3px;
    background: #67c3f3;
    border-radius: 50%;
    box-shadow: 0 0 2px rgba(103, 195, 243, 0.5);
}

/* 文档名称 */
.doc-name {
    flex: 1;
    color: #374151;
    font-weight: 500;
    white-space: nowrap;
    overflow: visible;
    text-overflow: unset;
    min-width: 0;
}

.doc-name.folder {
    color: #007aff;
    font-weight: 600;
}

/* 子节点容器 */
.tree-children {
    margin-left: 14px;
    border-left: 2px dotted rgba(59, 130, 246, 0.3);
    padding-left: 6px;
    display: none;
    position: relative;
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.03) 0%, transparent 20%);
}

.tree-children.expanded {
    display: block;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        max-height: 1000px;
        transform: translateY(0);
    }
}

/* 层级缩进 */
.tree-level-0 { margin-left: 0; }
.tree-level-1 { margin-left: 0px; }
.tree-level-2 { margin-left: 8px; }
.tree-level-3 { margin-left: 16px; }

/* 滚动条样式 */
.tree-container::-webkit-scrollbar {
    width: 4px;
}

.tree-container::-webkit-scrollbar-track {
    background: rgba(241, 245, 249, 0.5);
    border-radius: 2px;
}

.tree-container::-webkit-scrollbar-thumb {
    background: rgba(203, 213, 225, 0.8);
    border-radius: 2px;
}

.tree-container::-webkit-scrollbar-thumb:hover {
    background: rgba(148, 163, 184, 0.8);
}