body {
  --paper-bg: #faf9f6;
  background-color: var(--paper-bg);
}

/* 论文卡片 */
.paper-card {
  border: 1px solid #e0dcd3;
  border-radius: 8px;
  padding: 1.2em;
  margin-bottom: 1em;
  background: white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.paper-card h3 { margin-top: 0; }
.paper-card .meta {
  color: #666;
  font-size: 0.9em;
  margin-bottom: 0.5em;
}
.paper-card .tags {
  display: inline-block;
  background: #eef;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8em;
  margin-right: 4px;
}