:root{
  --blue:#0747a6;
  --bg:#f4f5f7;
  --panel:#ffffff;
  --border:#dfe1e6;
  --text:#172b4d;
  --muted:#6b778c;
}

*{box-sizing:border-box}

body{
  margin:0;
  font-family:Segoe UI, Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
}

.topbar{
  height:56px;
  background:var(--blue);
  color:#fff;
  display:flex;
  align-items:center;
  padding:0 16px;
  gap:12px;
}

.topbar select, .topbar button, .topbar input{
  height:36px;
  border-radius:6px;
  border:none;
  padding:0 10px;
  font-size:14px;
  cursor:pointer;
}

.layout{
  display:flex;
  height:calc(100vh - 56px);
}

.sidebar{
  width:300px;
  background:var(--panel);
  border-right:1px solid var(--border);
  padding:16px;
  overflow:auto;
}

.content{
  flex:1;
  padding:24px;
  overflow:auto;
}

.card{
  background:#fff;
  border:1px solid var(--border);
  border-radius:8px;
  padding:24px;
}

.section-title{
  font-size:18px;
  margin-bottom:12px;
}

.page-item{
  padding:6px 4px;
  cursor:pointer;
  border-radius:4px;
}

.page-item:hover{
  background:#eef2ff;
}

.page-item.active{
  background:#dbe4ff;
  font-weight:600;
}

.editor-toolbar{
  display:flex;
  gap:8px;
  margin-bottom:12px;
}

.editor{
  min-height:200px;
  border:1px solid var(--border);
  border-radius:6px;
  padding:12px;
}

.meta{
  margin-top:12px;
  font-size:13px;
  color:var(--muted);
}

.label{
  display:inline-block;
  background:#e9f2ff;
  padding:2px 8px;
  border-radius:12px;
  margin-right:6px;
  font-size:12px;
}

.classification{
  padding:4px 10px;
  border-radius:14px;
  font-size:12px;
  display:inline-block;
  margin-left:8px;
}

.UNCLASSIFIED{background:#e3fcef;}
.DUBIOUS{background:#ffebe6;}
.MODERATELY_DUBIOUS{background:#fff4e5;}

.toc{
  background:#f1f2f4;
  padding:10px;
  margin-bottom:12px;
  border-radius:6px;
}

.expand-block{
  border:1px solid var(--border);
  padding:8px;
  margin:8px 0;
  border-radius:6px;
  background:#fafbfc;
}