:root{
  --ink:#0A1626; --ink-2:#16273C; --gold:#A88B52; --gold-d:#8A6F3C; --gold-mist:rgba(168,139,82,.12); --gold-soft:rgba(168,139,82,.3);
  --surface-1:#F5F3EF; --line:#E7E3DB; --line-2:#D9D4C9; --muted:#5A6472; --muted-2:#8A8F98; --error:#BA1A1A;
  --shadow:0 10px 34px rgba(10,22,38,.12);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;color:var(--ink);background:var(--surface-1)}
button,input,textarea,select{font-family:inherit}
.screen{display:none;height:100vh}
.screen.on{display:block}
.muted{color:var(--muted-2)} .small{font-size:12px}

.btn{appearance:none;cursor:pointer;border:1px solid transparent;border-radius:6px;font-weight:700;font-size:13px;padding:9px 16px;display:inline-flex;align-items:center;gap:7px;transition:all .14s}
.btn.sm{padding:6px 11px;font-size:12px}
.btn-cta{background:var(--gold);color:#fff;border-color:var(--gold)}
.btn-cta:hover{background:var(--gold-d)}
.btn-ghost{background:#fff;border-color:var(--line-2);color:var(--ink)}
.btn-ghost:hover{border-color:var(--gold)}
.btn-ghost.danger{color:var(--error)}
.btn-ghost.danger:hover{border-color:var(--error);background:rgba(186,26,26,.05)}
.err{color:var(--error);font-size:12px;font-weight:600;min-height:18px;margin:4px 0}

/* brand */
.brand{display:inline-flex;align-items:center;gap:11px}
.brand-mark{width:34px;height:34px;border-radius:7px;background:var(--ink);color:#fff;font-weight:800;font-size:18px;display:flex;align-items:center;justify-content:center}
.brand-name{font-weight:800;font-size:15px;line-height:1;display:flex;flex-direction:column;gap:3px;color:var(--ink)}
.brand-name em{font-style:normal;font-size:10px;font-weight:600;color:var(--gold-d);letter-spacing:.05em}
.brand.sm .brand-mark{width:30px;height:30px;font-size:16px;border-radius:6px}
.brand.center{justify-content:center;margin-bottom:20px}

/* login */
.login{min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:radial-gradient(900px 480px at 80% -10%,rgba(168,139,82,.16),transparent 60%),var(--ink)}
.login-card{width:400px;max-width:92vw;background:#fff;border-radius:10px;box-shadow:var(--shadow);padding:34px}
.login-card h3{font-size:22px;font-weight:800;margin:4px 0;text-align:center}
.login-sub{font-size:12.5px;color:var(--muted-2);text-align:center;margin:0 0 24px}
.login-card label{font-size:11px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;display:block;margin-bottom:7px}
.login-card input{width:100%;font-size:14px;border:1px solid var(--line-2);border-radius:5px;padding:11px 13px;outline:none;margin-bottom:15px}
.login-card input:focus{border-color:var(--gold);box-shadow:0 0 0 3px var(--gold-mist)}
.login-hint{font-size:11.5px;color:var(--muted-2);text-align:center;margin-top:14px}

/* appbar */
.appbar{height:58px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px}
.appnav{display:flex;align-items:center;gap:16px}
.navlink{font-size:13px;font-weight:700;color:var(--ink);text-decoration:none}
.navlink:hover{color:var(--gold-d)}
.ws-dot{width:9px;height:9px;border-radius:50%;background:#c9ccd2}
.ws-dot.on{background:#2E8B57;box-shadow:0 0 0 3px rgba(46,139,87,.18)}
.avatar{position:relative}
.av-btn{cursor:pointer;display:inline-flex;align-items:center;gap:9px;background:#fff;border:1px solid var(--line-2);border-radius:999px;padding:4px 12px 4px 5px}
.av-btn:hover{border-color:var(--gold)}
.av-circle{width:28px;height:28px;border-radius:50%;background:var(--ink);color:#fff;font-weight:800;font-size:12px;display:flex;align-items:center;justify-content:center}
.av-name{font-size:13px;font-weight:700}
.av-menu{position:absolute;top:44px;right:0;width:230px;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:7px;display:none;z-index:50}
.av-menu.on{display:block}
.av-head{padding:9px 11px 11px;border-bottom:1px solid var(--line);margin-bottom:5px}
.av-head .n{font-weight:800;font-size:14px}
.av-head .r{font-size:11px;color:var(--muted-2);margin-top:3px}
.av-item{width:100%;text-align:left;background:#fff;border:0;border-radius:5px;padding:9px 11px;font-size:13px;font-weight:600;cursor:pointer;color:var(--ink)}
.av-item:hover{background:var(--surface-1)}
.av-item.danger{color:var(--error)}

/* appbar left group + project switcher */
.appbar-left{display:flex;align-items:center;gap:14px;min-width:0}
.proj-switch{position:relative}
.proj-chip{display:inline-flex;align-items:center;gap:9px;cursor:pointer;background:var(--gold-mist);border:1px solid var(--gold-soft);border-radius:999px;padding:5px 13px 5px 14px;max-width:340px}
.proj-chip:hover{border-color:var(--gold)}
.proj-chip .pc-k{font-size:10px;font-weight:800;letter-spacing:.06em;color:var(--gold-d);text-transform:uppercase;border-right:1px solid var(--gold-soft);padding-right:9px}
.proj-chip .pc-name{font-size:13.5px;font-weight:800;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.proj-chip .pc-caret{font-size:10px;color:var(--gold-d)}
.proj-menu{position:absolute;top:46px;left:0;width:330px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:8px;display:none;z-index:60}
.proj-menu.on{display:block}
.proj-menu .pm-h{font-size:10.5px;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:var(--muted-2);padding:6px 10px 8px}
.proj-opt{display:flex;align-items:center;gap:11px;width:100%;text-align:left;background:none;border:0;border-radius:8px;padding:10px 11px;cursor:pointer}
.proj-opt:hover{background:var(--surface-1)}
.proj-opt.on{background:var(--gold-mist)}
.proj-opt .po-mark{width:32px;height:32px;border-radius:8px;flex:none;background:var(--ink);color:#fff;font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center}
.proj-opt.on .po-mark{background:var(--gold)}
.proj-opt .po-info{min-width:0;flex:1}
.proj-opt .po-name{font-size:13.5px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.proj-opt .po-sub{font-size:11px;color:var(--muted-2);margin-top:2px}
.proj-opt .po-cur{font-size:10px;font-weight:800;color:var(--gold-d)}
.pm-add{width:100%;text-align:left;background:none;border:0;border-top:1px solid var(--line);margin-top:6px;padding:11px;font-size:12.5px;font-weight:700;color:var(--gold-d);cursor:pointer;border-radius:0 0 8px 8px}
.pm-add:hover{background:var(--gold-mist)}

/* workspace shell */
.workspace{height:calc(100vh - 58px);display:grid;grid-template-columns:214px 1fr;min-height:0}
.sidebar{background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:16px 12px}
.snav{display:flex;flex-direction:column;gap:3px}
.snav-item{display:flex;align-items:center;gap:11px;width:100%;text-align:left;background:none;border:0;border-radius:9px;padding:11px 13px;font-size:13.5px;font-weight:700;color:var(--muted);cursor:pointer;transition:all .12s}
.snav-item i{width:7px;height:7px;border-radius:50%;background:currentColor;opacity:.45;flex:none}
.snav-item:hover{background:var(--surface-1);color:var(--ink)}
.snav-item.on{background:var(--gold-mist);color:var(--gold-d)}
.snav-item.on i{opacity:1}
.snav-item.hide{display:none}
.snav-foot{margin-top:auto;padding:12px 13px;color:var(--muted-2)}
.sf-line{font-size:11px;font-weight:700}
.sf-sub{font-size:10.5px;margin-top:3px}
.content{position:relative;min-width:0;min-height:0;background:#EEEAE3}
.pane{display:none;position:absolute;inset:0}
.pane.on{display:block}
.pane-files.on{display:block}
.pane-frame{background:#fff}
.pane-frame iframe{width:100%;height:100%;border:0;display:block}
.pane-over{overflow:auto;padding:26px 30px;background:var(--surface-1)}

/* overview */
.ov-hero{position:relative;overflow:hidden;border-radius:14px;color:#fff;padding:30px 32px;margin-bottom:22px;
  background:radial-gradient(800px 300px at 88% -30%,rgba(168,139,82,.4),transparent 60%),linear-gradient(120deg,var(--ink),var(--ink-2))}
.ov-hero .oh-tag{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--gold);background:rgba(168,139,82,.16);border:1px solid var(--gold-soft);border-radius:999px;padding:3px 11px;margin-bottom:14px}
.ov-hero h1{margin:0 0 10px;font-size:26px;font-weight:800;line-height:1.25}
.ov-hero p{margin:0;max-width:680px;font-size:13.5px;line-height:1.7;color:rgba(255,255,255,.78)}
.ov-hero .oh-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.oh-actions .btn-cta{background:var(--gold);border-color:var(--gold)}
.oh-actions .btn-line{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.28);color:#fff}
.oh-actions .btn-line:hover{background:rgba(255,255,255,.16)}
.ov-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:24px}
.ov-stat{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px}
.ov-stat .os-n{font-size:26px;font-weight:800;color:var(--ink);line-height:1}
.ov-stat .os-l{font-size:12px;color:var(--muted-2);margin-top:7px;font-weight:600}
.ov-sech{font-size:13px;font-weight:800;letter-spacing:.03em;color:var(--muted);text-transform:uppercase;margin:0 0 12px}
.ov-recent{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.ov-rec{display:flex;align-items:center;gap:13px;padding:13px 18px;border-bottom:1px solid var(--line);cursor:pointer}
.ov-rec:last-child{border-bottom:0}
.ov-rec:hover{background:var(--surface-1)}
.ov-rec .or-icon{width:36px;height:36px;border-radius:8px;flex:none;display:flex;align-items:center;justify-content:center;font-size:10.5px;font-weight:800;color:#fff}
.ov-rec .or-name{font-size:13.5px;font-weight:700}
.ov-rec .or-meta{font-size:11.5px;color:var(--muted-2);margin-top:3px}
.ov-rec .or-when{margin-left:auto;font-size:11.5px;color:var(--muted-2)}
.ov-empty{background:#fff;border:1px solid var(--line);border-radius:12px;padding:34px;text-align:center;color:var(--muted-2);font-size:13px}

/* layout (files pane) */
.layout{height:100%;display:grid;grid-template-columns:300px 1fr 330px}
.col-files,.col-side{background:#fff;display:flex;flex-direction:column;min-height:0}
.col-files{border-right:1px solid var(--line)}
.col-side{border-left:1px solid var(--line)}
.col-preview{min-width:0;display:flex;flex-direction:column;background:#EEEAE3}
.col-head{display:flex;align-items:center;justify-content:space-between;padding:15px 16px;font-size:12px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);border-bottom:1px solid var(--line)}

.dropzone{margin:12px 14px;border:1.5px dashed var(--line-2);border-radius:8px;padding:14px;text-align:center;font-size:12px;color:var(--muted-2);cursor:pointer;transition:all .14s}
.dropzone:hover,.dropzone.drag{border-color:var(--gold);background:var(--gold-mist);color:var(--gold-d)}

.filelist{flex:1;overflow:auto;padding:4px 10px 14px}
.fitem{display:flex;gap:11px;padding:11px 12px;border-radius:8px;cursor:pointer;border:1px solid transparent}
.fitem:hover{background:var(--surface-1)}
.fitem.on{background:var(--gold-mist);border-color:var(--gold-soft)}
.ficon{width:38px;height:38px;border-radius:7px;flex:none;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800;color:#fff}
.finfo{min-width:0;flex:1}
.fname{font-size:13.5px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fmeta{font-size:11px;color:var(--muted-2);margin-top:3px;display:flex;gap:9px;flex-wrap:wrap}
.badge{font-size:10px;font-weight:700;color:var(--gold-d);background:var(--gold-mist);border:1px solid var(--gold-soft);border-radius:999px;padding:0 7px}

/* preview */
.preview-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--muted-2);gap:8px}
.pe-mark{width:54px;height:54px;border-radius:12px;background:var(--ink);color:#fff;font-weight:800;font-size:26px;display:flex;align-items:center;justify-content:center;margin-bottom:6px}
.pe-sub{font-size:12px}
.preview-wrap{flex:1;display:flex;flex-direction:column;min-height:0}
.preview-head{background:#fff;border-bottom:1px solid var(--line);padding:13px 18px;display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
.ph-name{font-size:15px;font-weight:800}
.ph-meta{font-size:11.5px;color:var(--muted-2);margin-top:3px}
.ph-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.vsel{font-size:12px;border:1px solid var(--line-2);border-radius:5px;padding:6px 8px;background:#fff}
.preview-body{flex:1;overflow:auto;padding:18px;min-height:0}
.preview-body iframe{width:100%;height:100%;border:1px solid var(--line);border-radius:6px;background:#fff;min-height:520px}
.preview-body img{max-width:100%;border-radius:6px;box-shadow:var(--shadow)}
.xlsx-wrap{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:8px}
.xlsx-tabs{display:flex;gap:4px;padding:8px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.xlsx-tab{font-size:12px;border:1px solid var(--line-2);background:#fff;border-radius:5px;padding:4px 10px;cursor:pointer}
.xlsx-tab.on{background:var(--gold);color:#fff;border-color:var(--gold)}
.xlsx-wrap table{border-collapse:collapse;font-size:12.5px;width:100%}
.xlsx-wrap td,.xlsx-wrap th{border:1px solid var(--line);padding:5px 9px;white-space:nowrap}
.xlsx-wrap tr:first-child td{background:var(--surface-1);font-weight:700}
.docx-wrap{background:#fff;border:1px solid var(--line);border-radius:8px;padding:36px 46px;max-width:860px;margin:0 auto;line-height:1.7;font-size:14px}
.docx-wrap h1,.docx-wrap h2,.docx-wrap h3{line-height:1.3}
.docx-wrap img{max-width:100%}
.docx-wrap table{border-collapse:collapse} .docx-wrap td,.docx-wrap th{border:1px solid var(--line);padding:5px 8px}
.txt-wrap{background:#fff;border:1px solid var(--line);border-radius:8px;padding:20px;white-space:pre-wrap;font-family:ui-monospace,Menlo,monospace;font-size:12.5px;line-height:1.6}
.dwg-wrap{background:#0A1626;border:1px solid var(--line);border-radius:8px;padding:14px;height:calc(100% - 34px);min-height:420px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.dwg-wrap svg{width:100%;height:100%;max-height:100%}
.dwg-tip{font-size:11.5px;color:var(--muted-2);text-align:center;padding:9px 0 2px}
.pv-msg{color:var(--muted-2);text-align:center;padding:40px}

/* side */
.side-tabs{display:flex;border-bottom:1px solid var(--line)}
.stab{flex:1;background:#fff;border:0;padding:14px;font-size:13px;font-weight:700;color:var(--muted-2);cursor:pointer;border-bottom:2px solid transparent}
.stab.on{color:var(--ink);border-bottom-color:var(--gold)}
.side-pane{flex:1;display:flex;flex-direction:column;min-height:0}
.comments,.activity{flex:1;overflow:auto;padding:14px}
.cmt{margin-bottom:14px}
.cmt-h{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.cmt-av{width:24px;height:24px;border-radius:50%;background:var(--ink);color:#fff;font-size:11px;font-weight:800;display:flex;align-items:center;justify-content:center}
.cmt-name{font-size:12.5px;font-weight:700}
.cmt-time{font-size:10.5px;color:var(--muted-2)}
.cmt-body{font-size:13px;line-height:1.55;background:var(--surface-1);border-radius:8px;padding:9px 12px;white-space:pre-wrap}
.cmt-ver{font-size:10px;color:var(--gold-d);margin-left:auto}
.comment-box{border-top:1px solid var(--line);padding:11px;display:flex;gap:8px;align-items:flex-end}
.comment-box textarea{flex:1;resize:none;height:46px;max-height:120px;border:1px solid var(--line-2);border-radius:6px;padding:9px 11px;font-size:13px;outline:none}
.comment-box textarea:focus{border-color:var(--gold);box-shadow:0 0 0 3px var(--gold-mist)}

.act{display:flex;gap:10px;padding:9px 0;border-bottom:1px solid var(--line)}
.act-dot{width:8px;height:8px;border-radius:50%;background:var(--gold);margin-top:6px;flex:none}
.act-txt{font-size:12.5px;line-height:1.5}
.act-txt b{font-weight:700}
.act-time{font-size:10.5px;color:var(--muted-2);margin-top:2px}

/* toasts */
.toasts{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:8px;z-index:90}
.toast{background:var(--ink);color:#fff;padding:11px 16px;border-radius:8px;font-size:13px;box-shadow:var(--shadow);animation:slidein .2s ease}
@keyframes slidein{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* modal */
.modal{position:fixed;inset:0;display:none;align-items:center;justify-content:center;z-index:80}
.modal.on{display:flex}
.modal-scrim{position:absolute;inset:0;background:rgba(10,22,38,.42)}
.modal-card{position:relative;width:720px;max-width:94vw;max-height:86vh;background:#fff;border-radius:10px;box-shadow:var(--shadow);display:flex;flex-direction:column}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;border-bottom:1px solid var(--line)}
.modal-head h3{margin:0;font-size:17px;font-weight:800}
.modal-head .x{border:0;background:none;font-size:24px;cursor:pointer;color:var(--muted-2);line-height:1}
.modal-body{padding:18px 22px;overflow:auto}
.utable{width:100%;border-collapse:collapse;font-size:13px}
.utable th{font-size:10.5px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted-2);text-align:left;padding:8px;border-bottom:1px solid var(--line-2)}
.utable td{padding:8px;border-bottom:1px solid var(--line)}
.utable input,.utable select{width:100%;font-size:12.5px;border:1px solid var(--line-2);border-radius:4px;padding:6px 8px}
.u-addrow{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap;align-items:center}
.u-addrow input,.u-addrow select{font-size:12.5px;border:1px solid var(--line-2);border-radius:4px;padding:7px 9px}

@media (max-width:980px){
  .workspace{grid-template-columns:1fr;grid-template-rows:auto 1fr}
  .sidebar{flex-direction:row;padding:8px;border-right:0;border-bottom:1px solid var(--line);overflow-x:auto}
  .snav{flex-direction:row}
  .snav-foot{display:none}
  .proj-chip{max-width:180px}
  .ov-stats{grid-template-columns:repeat(2,1fr)}
  .layout{grid-template-columns:1fr;grid-template-rows:auto auto auto;height:auto}
  .col-files,.col-side{border:0;border-bottom:1px solid var(--line)}
}