* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #f5f7fa;
    color: #333;
    height: 100vh;
    overflow: hidden;
}

/* 应用容器 */
.app-container {
    display: flex;
    height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: 260px;
    background: #fff;
    border-right: 1px solid #e8e8e8;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid #e8e8e8;
}

.sidebar-header h1 {
    font-size: 18px;
    font-weight: 600;
    color: #1a73e8;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-actions {
    padding: 16px;
}

.sidebar-nav {
    flex: 1;
    padding: 8px;
    overflow-y: auto;
}

.nav-item {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #555;
    transition: all 0.2s;
    margin-bottom: 2px;
}

.nav-item:hover {
    background: #f0f4f8;
    color: #1a73e8;
}

.nav-item.active {
    background: #e8f0fe;
    color: #1a73e8;
    font-weight: 500;
}

.nav-folder {
    padding-left: 12px;
}

.nav-folder .nav-item {
    padding-left: 24px;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid #e8e8e8;
}

/* 主内容区 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* 工具栏 */
.toolbar {
    padding: 16px 24px;
    background: #fff;
    border-bottom: 1px solid #e8e8e8;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.breadcrumb-item {
    color: #1a73e8;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background 0.2s;
}

.breadcrumb-item:hover {
    background: #f0f4f8;
}

.breadcrumb-separator {
    color: #999;
}

.toolbar-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.view-toggle {
    display: flex;
    background: #f0f4f8;
    border-radius: 6px;
    padding: 2px;
    margin-left: 8px;
}

/* 按钮样式 */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    font-weight: 500;
}

.btn-primary {
    background: #1a73e8;
    color: #fff;
}

.btn-primary:hover {
    background: #1557b0;
}

.btn-secondary {
    background: #f0f4f8;
    color: #333;
}

.btn-secondary:hover {
    background: #e0e7ef;
}

.btn-danger {
    background: #ea4335;
    color: #fff;
}

.btn-danger:hover {
    background: #c5221f;
}

.btn-text {
    background: transparent;
    color: #555;
}

.btn-text:hover {
    background: #f0f4f8;
    color: #1a73e8;
}

.btn-icon {
    padding: 6px 10px;
    background: transparent;
    color: #666;
}

.btn-icon:hover {
    background: #e0e7ef;
}

.btn-icon.active {
    background: #fff;
    color: #1a73e8;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* 拖拽区域 */
.drop-zone {
    margin: 24px;
    padding: 40px;
    border: 2px dashed #c5d5e8;
    border-radius: 12px;
    text-align: center;
    color: #666;
    transition: all 0.3s;
    background: #fafbfc;
}

.drop-zone.drag-over {
    border-color: #1a73e8;
    background: #e8f0fe;
    color: #1a73e8;
}

.drop-zone i {
    font-size: 48px;
    margin-bottom: 16px;
    color: #c5d5e8;
}

.drop-zone.drag-over i {
    color: #1a73e8;
}

.drop-zone p {
    font-size: 16px;
    margin-bottom: 8px;
}

.drop-zone-hint {
    font-size: 13px;
    color: #999;
}

/* 文件列表 */
.file-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 24px 24px;
}

/* 列表视图 */
.file-list.list-view {
    display: block;
}

.file-list.list-view .file-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: #fff;
    border-radius: 8px;
    margin-bottom: 4px;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.file-list.list-view .file-item:hover {
    background: #f8fafc;
    border-color: #e0e7ef;
}

.file-list.list-view .file-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-right: 16px;
    border-radius: 8px;
    background: #f0f4f8;
}

.file-list.list-view .file-icon.folder {
    color: #fbbc04;
    background: #fef7e0;
}

.file-list.list-view .file-icon.file {
    color: #1a73e8;
    background: #e8f0fe;
}

.file-list.list-view .file-info {
    flex: 1;
    min-width: 0;
}

.file-list.list-view .file-name {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-list.list-view .file-meta {
    font-size: 12px;
    color: #999;
}

.file-list.list-view .file-actions {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}

.file-list.list-view .file-item:hover .file-actions {
    opacity: 1;
}

/* 网格视图 */
.file-list.grid-view {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 16px;
}

.file-list.grid-view .file-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 12px;
    background: #fff;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
    text-align: center;
}

.file-list.grid-view .file-item:hover {
    border-color: #1a73e8;
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.15);
    transform: translateY(-2px);
}

.file-list.grid-view .file-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin-bottom: 12px;
    border-radius: 12px;
    background: #f0f4f8;
}

.file-list.grid-view .file-icon.folder {
    color: #fbbc04;
    background: #fef7e0;
}

.file-list.grid-view .file-icon.file {
    color: #1a73e8;
    background: #e8f0fe;
}

.file-list.grid-view .file-info {
    width: 100%;
}

.file-list.grid-view .file-name {
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.file-list.grid-view .file-meta {
    font-size: 11px;
    color: #999;
}

.file-list.grid-view .file-actions {
    display: flex;
    gap: 4px;
    margin-top: 8px;
    opacity: 0;
    transition: opacity 0.2s;
}

.file-list.grid-view .file-item:hover .file-actions {
    opacity: 1;
}

/* 文件操作按钮 */
.file-action-btn {
    padding: 6px 8px;
    border: none;
    background: #f0f4f8;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    color: #666;
    transition: all 0.2s;
}

.file-action-btn:hover {
    background: #e0e7ef;
    color: #1a73e8;
}

.file-action-btn.danger:hover {
    background: #fce8e6;
    color: #ea4335;
}

/* 加载状态 */
.loading {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #666;
}

.loading i {
    font-size: 32px;
    color: #1a73e8;
    margin-bottom: 16px;
}

/* 空状态 */
.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #999;
}

.empty-state i {
    font-size: 64px;
    margin-bottom: 16px;
    color: #d0d7de;
}

.empty-state p {
    font-size: 16px;
    margin-bottom: 8px;
}

.empty-hint {
    font-size: 13px;
    color: #bbb;
}

/* 弹窗 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-large {
    max-width: 720px;
}

.modal-content h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #333;
}

.modal-desc {
    font-size: 14px;
    color: #666;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
    color: #333;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #1a73e8;
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.form-group textarea {
    resize: vertical;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
}

.form-group small {
    display: block;
    font-size: 12px;
    color: #999;
    margin-top: 4px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid #e8e8e8;
}

/* 分享链接 */
.share-link-container {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.share-link-container input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    font-size: 13px;
    background: #f8fafc;
    font-family: 'Consolas', 'Monaco', monospace;
}

.share-info {
    padding: 12px;
    background: #e8f0fe;
    border-radius: 6px;
    font-size: 13px;
    color: #1a73e8;
}

.share-info i {
    margin-right: 6px;
}

/* Toast 提示 */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    background: #333;
    color: #fff;
    border-radius: 8px;
    font-size: 14px;
    z-index: 2000;
    transition: transform 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background: #34a853;
}

.toast.error {
    background: #ea4335;
}

.toast.info {
    background: #1a73e8;
}

/* 响应式 */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    
    .toolbar {
        padding: 12px 16px;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .toolbar-actions {
        flex-wrap: wrap;
    }
    
    .drop-zone {
        margin: 16px;
        padding: 24px;
    }
    
    .file-list {
        padding: 0 16px 16px;
    }
    
    .file-list.grid-view {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 12px;
    }
    
    .file-list.grid-view .file-icon {
        width: 48px;
        height: 48px;
        font-size: 24px;
    }
    
    .modal-content {
        width: 95%;
        margin: 16px;
    }
}