:root{--bg:#fff;--surface:#fff;--surface-alt:#f2fbfb;--text:#526164;--muted:#7b8d90;--line:#d3e2e2;--line-dark:#a3bfc0;--accent:#00979d;--danger:#b3261e}
*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--bg);overflow-x:hidden}
body{min-height:100vh;background:var(--bg);color:var(--text);font:13px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}
button,input,select{font:inherit;color:inherit}
button,input,select,dialog,.card{border-radius:0}
button{min-height:30px;padding:4px 9px;border:1px solid var(--line-dark);background:var(--surface);cursor:pointer}
button:hover,a:hover{text-decoration:underline}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,.table-scroll:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
a{color:inherit;text-decoration:none}
input,select{height:30px;border:1px solid var(--line-dark);background:var(--surface);padding:4px 7px}
input:focus,select:focus{border-color:var(--accent);outline:none}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.shell{width:min(1440px,100%);margin:0 auto;padding:16px 20px 36px}
.top{height:40px;display:flex;align-items:flex-start;justify-content:space-between;border-bottom:1px solid var(--accent);margin-bottom:14px}
.brand{font-size:16px;font-weight:700;letter-spacing:.01em}
.top-actions{display:flex;align-items:center;gap:12px}
.text-button{min-height:auto;padding:0;border:0}
.layout{display:grid;grid-template-columns:190px minmax(0,1fr);gap:20px}
.sidebar{min-width:0;border-right:1px solid var(--line);padding-right:14px}
.sidebar-title{font-weight:700;padding:5px 6px 8px;border-bottom:1px solid var(--line)}
.folder-tree{list-style:none;padding-left:14px;margin-left:7px;border-left:1px solid var(--line)}
.root-tree{padding-left:0;margin-left:0;border-left:0}
.folder-row{display:flex;align-items:center;min-width:0;border-bottom:1px solid #eee}
.folder{flex:1;min-width:0;padding:6px 8px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;border-left:3px solid transparent}
.folder:hover{background:var(--surface-alt)}
.folder.active{font-weight:700;text-decoration:none;color:var(--accent);background:#e2f4f4;border-left-color:var(--accent)}
.folder-rename,.folder-delete{display:none;min-height:auto;border:0;padding:3px 4px;font-size:11px}
.folder-rename{color:var(--accent)}
.folder-delete{color:var(--danger)}
.folder-row:focus-within .folder-rename,.folder-row:hover .folder-rename,.folder-row:focus-within .folder-delete,.folder-row:hover .folder-delete{display:block}
.folder-create{display:flex;margin:0 0 12px;align-items:stretch}
.folder-create input{width:100%;min-width:0;border-right:0}
.folder-create button{width:58px;padding-left:4px;padding-right:4px}
.search button{width:58px;padding-left:4px;padding-right:4px}
.trash-link{display:block;padding:9px 6px;margin-top:8px;border-top:1px solid var(--line);color:var(--danger)}
.top .trash-link{padding:0;margin:0;border-top:0}
.content{min-width:0}
.workspace-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:13px}
.workspace-head h1{font-size:22px;line-height:1.15;margin-top:4px}
.crumb{font-size:12px;color:var(--muted)}
.head-actions{display:flex;gap:6px}
.primary{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:600}
.primary:disabled{opacity:.45;cursor:not-allowed}
.upload-dropzone{display:flex;align-items:center;gap:8px;border:1px dashed var(--accent);padding:3px 6px;background:var(--surface-alt)}
.upload-dropzone.drag-over{background:#d9f1f2}
.upload-dropzone.is-disabled{border-color:var(--line-dark)}
.drop-hint{font-size:11px;color:var(--muted);white-space:nowrap}
.upload-progress{margin:10px 0;border:1px solid var(--line);padding:8px;background:var(--surface-alt)}
.progress-label{display:flex;justify-content:space-between;margin-bottom:4px;color:var(--muted)}
.upload-progress progress{width:100%;height:8px;accent-color:var(--accent)}
.tools{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:9px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.search{display:flex;width:min(440px,55%)}
.search input{width:100%;min-width:0;border-right:0}
.summary{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.home-search{padding:12px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.home-search .search{width:min(520px,100%)}
.overview{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0 16px}
.overview-title{font-weight:700;margin-bottom:12px}
.overview-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.overview-item{padding:14px;background:var(--surface-alt);border:1px solid var(--line)}
.overview-item span,.overview-item strong{display:block}
.overview-item span{color:var(--muted);font-size:12px}
.overview-item strong{margin-top:5px;font-size:20px;font-weight:600;color:var(--text)}
.section-title{font-weight:700;padding:11px 0 7px}
.table-scroll{max-width:100%;overflow-x:auto;border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark)}
.file-table{width:100%;min-width:920px;border-collapse:collapse;table-layout:fixed}
.file-table .col-name{width:29%}
.file-table .col-size{width:9%}
.file-table .col-time{width:15%}
.file-table .col-remark{width:29%}
.file-table .col-folder{width:16%}
.file-table .col-action{width:18%}
.file-table th,.file-table td{height:36px;padding:5px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:middle;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file-table th{height:32px;background:var(--surface-alt);font-size:12px;font-weight:600;color:var(--text)}
.file-table tbody tr:last-child td{border-bottom:0}
.file-table th:last-child,.file-table .action-cell{padding-left:4px;padding-right:4px;text-align:center}
.file-table td button{min-height:auto;border:0;padding:2px 4px;background:transparent}
.file-table .action-cell button{padding-left:0;padding-right:0}
.file-name a{display:block;overflow:hidden;text-overflow:ellipsis;font-weight:600}
.file-name button{display:block;width:100%;padding:0;border:0;background:transparent;text-align:left;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.download-button{font-size:12px}
.file-name a:hover{text-decoration:underline}
.number{font-variant-numeric:tabular-nums;color:var(--muted)}
.remark-cell button{display:block;width:100%;overflow:hidden;text-align:left;text-overflow:ellipsis;white-space:nowrap;color:var(--muted)}
.danger{color:var(--danger)}
.empty{padding:28px 8px;border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark);color:var(--muted);text-align:center}
dialog{width:min(420px,calc(100% - 32px));margin:auto;border:1px solid var(--line-dark);background:#fff;padding:16px}
dialog::backdrop{background:rgba(0,0,0,.25)}
dialog form{display:grid;gap:8px}
dialog input,dialog select{width:100%}
.preview-dialog{width:min(1000px,calc(100% - 24px));height:min(760px,calc(100% - 24px));}
.preview-status{min-height:20px;padding:7px 0;color:var(--muted)}
.preview-body{height:calc(100% - 72px);overflow:auto;background:#f2fbfb;border:1px solid var(--line);padding:10px;text-align:center}
.preview-body img{max-width:100%;max-height:100%;object-fit:contain}
.preview-body pre{margin:0;text-align:left;white-space:pre-wrap;word-break:break-word;font:12px/1.55 ui-monospace,SFMono-Regular,Consolas,monospace;color:#263638}
.preview-body canvas{display:block;max-width:100%;height:auto;margin:0 auto 10px;background:#fff;box-shadow:0 1px 4px #b7caca}
.preview-body audio,.preview-body video{max-width:100%;margin-top:20px}
.stl-viewer{height:100%;min-height:420px;position:relative;cursor:grab}.stl-viewer canvas{width:100%;height:100%;display:block}.stl-toggle{position:absolute;top:8px;right:8px;background:#fff}
.archive-row{text-align:left;padding:7px;border-bottom:1px solid var(--line);font-family:ui-monospace,monospace}.archive-row.is-preview{cursor:pointer;color:var(--accent)}.archive-row.is-preview:hover{text-decoration:underline}
.dialog-head,.dialog-actions{display:flex;align-items:center;justify-content:space-between;gap:8px}
.dialog-head{padding-bottom:8px;border-bottom:1px solid var(--line)}
.dialog-head button{min-height:auto;border:0;padding:0}
.dialog-actions{justify-content:flex-end;padding-top:8px}
.card{border:1px solid var(--line-dark);background:var(--surface)}
.login{max-width:360px;margin:12vh auto;padding:24px}
.login h1{font-size:20px}
.login p{margin-top:4px;color:var(--muted)}
.login form{display:grid;gap:7px;margin-top:18px}
.login .primary{margin-top:3px}
.error{margin-top:10px;color:var(--danger)}
.logo{display:none}
.trash{padding:16px}
.trash>p{margin-bottom:10px;color:var(--muted)}
.file-card{display:flex;align-items:center;gap:8px;padding:8px 0;border-bottom:1px solid var(--line)}
.file-info{flex:1;min-width:0}
.file-info b,.file-info small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.file-info small{color:var(--muted)}
@media(max-width:760px){
  .shell{width:100%;padding:12px}
  .top{margin-bottom:10px}
  .layout{display:block}
  .sidebar{border-right:0;border-bottom:1px solid var(--line-dark);padding:0 0 12px;margin-bottom:14px}
  .folder-tree{padding-left:10px}
  .root-tree{padding-left:0}
  .folder-rename,.folder-delete{display:block}
  .workspace-head{align-items:flex-start}
  .workspace-head h1{font-size:19px}
  .tools{display:block}
  .overview-grid{grid-template-columns:1fr}
  .search{width:100%}
  .summary{margin-top:7px;white-space:normal}
  .file-table{min-width:920px}
}