:root{ --bg:#fff; --fg:#111; --muted:#666; --border:#000; }
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,PingFang SC,Noto Sans CJK SC,Microsoft YaHei,system-ui,sans-serif;height:100%}
a{color:inherit;text-decoration:underline}
header{padding:24px;border-bottom:1px solid var(--border)}
header h1{margin:0 0 4px 0;font-size:22px}
header p{margin:0;color:var(--muted)}
/* Tabs */
.tabs{display:flex;flex-direction:column;gap:4px;padding:8px 16px;border-bottom:1px solid var(--border)}
.tab-row{display:flex;flex-wrap:wrap;gap:8px}
.group-tabs{margin-bottom:2px}
.sub-tabs{}
.tab{padding:8px 12px;border:1px solid var(--border);border-bottom:none}
.tab.active{background:#000;color:#fff}

/* Workbench layout */
.workbench{display:grid;grid-template-columns:300px 1fr;gap:0;min-height:70vh;align-items:flex-start}
.list{border-right:1px solid var(--border);padding:12px;display:flex;flex-direction:column;gap:8px;position:sticky;top:72px;max-height:calc(100vh - 80px);overflow:auto;background:var(--bg);z-index:10}
.list .item{padding:10px;border:1px solid var(--border);cursor:pointer}
.list .item.selected,.list .item:hover{background:#000;color:#fff}
.list .item .title{font-weight:600}
.list .item .meta{color:var(--muted);font-size:12px}
.list .item.state-active{border-left:4px solid #000}
.list .item.state-planned{border-left:4px solid #777}
.list .item.state-done{border-left:4px solid #ccc;opacity:0.7}
.detail{padding:16px;position:relative}
.detail .doc-main{max-width:780px}
.doc-main section{margin-bottom:18px}

/* 路径与元信息 */
.doc-meta.path-meta{margin:4px 0 10px 0;font-size:13px;color:var(--muted)}
.path-row{margin:2px 0}
.fs-path{cursor:pointer}
.copy-path-btn{
  margin-left:8px;
  border:1px solid var(--border);
  background:none;
  font-size:11px;
  padding:2px 6px;
  cursor:pointer;
}
.copy-path-btn:hover{background:#000;color:#fff}

/* 任务首页黑白简介布局 */
.task-overview{padding-bottom:14px;border-bottom:1px solid var(--border)}
.task-header{margin-bottom:6px}
.task-header h2{margin:0 0 2px 0;font-size:20px}
.task-header .task-status{margin:0;font-size:13px;color:var(--muted)}
.task-grid{
  margin-top:10px;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:10px;
}
.task-card{
  border:1px solid var(--border);
  padding:8px 10px;
  font-size:14px;
  background:#fff;
}
.task-card h3{
  margin:0 0 4px 0;
  font-size:13px;
  letter-spacing:.04em;
}
.task-card p{margin:3px 0;font-size:13px}
.task-card ol,
.task-card ul{
  margin:4px 0 0 18px;
  padding:0;
  font-size:13px;
}

/* SVG 用户流程图（黑白） */
.task-flow-svg{margin-top:14px}
.task-flow{
  width:100%;
  max-width:100%;
  height:auto;
  border:1px solid var(--border);
  background:#fff;
}
.task-flow .node{
  fill:#fff;
  stroke:#000;
  stroke-width:1;
}
.task-flow .arrow{
  stroke:#000;
  stroke-width:1.2;
  fill:none;
}
.task-flow text{
  font-size:11px;
  fill:#111;
}

/* 详细文档区域 */
.doc-section>h3{
  margin:4px 0 6px 0;
  font-size:13px;
  color:var(--muted);
  text-transform:uppercase;
  letter-spacing:.08em;
}

.preview-pane{
  position:fixed;
  top:72px;
  right:16px;
  width:400px;
  max-width:45%;
  bottom:8px;
  background:var(--bg);
  border:1px solid var(--border);
  padding:12px 12px 10px;
  font-size:14px;
  box-shadow:0 0 8px rgba(0,0,0,0.15);
  z-index:20;
}
.preview-pane.preview-hidden{display:none}
.preview-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.preview-title{font-weight:600}
.preview-close{border:1px solid var(--border);background:none;padding:2px 8px;font-size:12px;cursor:pointer}
.preview-close:hover{background:#000;color:#fff}
.preview-body{max-height:calc(100vh - 72px - 40px);overflow:auto}
.md-preview{font-size:13px;line-height:1.6;border:1px solid var(--border);padding:8px;background:#fafafa}
.link-preview{text-decoration:underline dotted}
code.inline-file-missing,
a.missing-file{color:#999;border-bottom:1px dashed #aaa;text-decoration:none;cursor:default}
a.missing-file{pointer-events:none}
@media (min-width:1100px){
  .detail{padding-right:440px}
}
.muted{color:var(--muted)}
.doc h1,.doc h2,.doc h3,.doc h4{margin:18px 0 8px 0}
.doc p{margin:8px 0}
.doc ul{margin:8px 0 8px 20px}
.doc pre{background:#f5f5f5;border:1px solid var(--border);padding:12px;overflow:auto}
footer{padding:16px;border-top:1px solid var(--border);color:var(--muted);font-size:13px}
.ux-meta-link{margin:4px 0 8px 0;font-size:13px}