/* ============================================================
   papers.css — GitHub-tree-style expandable paper list
   (mirrors tree.css conventions)
   ============================================================ */
.paper-tree-container {
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 0.9rem;
}

.paper-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.paper-node {
  position: relative;
}

/* ---- Row ---- */
.paper-node-row {
  display: flex;
  flex-wrap: nowrap;
  align-items: flex-start;
  gap: 6px;
  padding: 4px 6px 4px 2px;
  border-radius: 4px;
  cursor: pointer;
  position: relative;
  transition: background 0.15s ease;
  user-select: none;
}

.paper-node-row:hover {
  background: rgba(88, 6, 6, 0.05);
}
.paper-node-row:focus {
  outline: 2px solid #1b3d9b;
  outline-offset: -2px;
}

/* ---- Chevron ---- */
.paper-chevron {
  display: inline-block;
  width: 1em;
  text-align: center;
  color: #777;
  font-style: normal;
  font-size: 0.75rem;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}
.paper-node.open > .paper-node-row .paper-chevron {
  transform: rotate(90deg);
}

/* ---- Icon ---- */
.paper-icon {
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1;
}

/* ---- Name + meta ---- */
.paper-name {
  color: #333;
  font-weight: 400;
  flex: 1 1 auto;
  white-space: normal;
  word-break: break-word;
  min-width: 0;
}

.paper-side {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
  min-width: 0;
  flex: 1 1 auto; 
  padding-top: 0.05em; /* nudge to align with first line of title */
}

.paper-meta {
  color: #777;
  font-size: 0.8rem;
  white-space: normal;
  word-break: break-word;
  min-width: 0; 
}

.paper-date {
  color: #999;
  font-size: 0.78rem;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ---- Collapsible detail panel ---- */
.paper-detail {
  display: none;
  background: #f9f6f6;
  border: 1px solid #e8dede;
  border-radius: 6px;
  padding: 1em 1.2em;
  margin: 0.5em 0 0.5em 1.8em;
  font-family: 'Roboto', sans-serif;
  font-size: 0.88rem;
  line-height: 1.6;
  color: #444;
}
.paper-node.open > .paper-detail {
  display: block;
}
.paper-detail-desc {
  margin: 0 0 0.4em;
}
.paper-detail .detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 0.6em;
}
.paper-detail .tag {
  background: #f0e8e8;
  color: #580606;
  border-radius: 3px;
  padding: 2px 7px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  text-decoration: none;
}
.paper-detail .tag:hover {
  text-decoration: underline;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .paper-meta {
    display: none;
  }
  .paper-date {
    display: none;
  }
}