/* ── Convert tab layout ── */
.conv-layout {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 1rem 1.5rem 1.25rem;
  gap: 0.75rem;
}
.conv-toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}
#conv-format { width: 140px; }
.conv-split {
  flex: 1;
  display: grid;
  grid-template-columns: var(--conv-col-width, 500px) 5px 1fr;
  overflow: hidden;
  min-height: 0;
}

/* ── Editor panes ── */
.pane {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.pane-header {
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 0.9rem;
  height: 36px;
  border-bottom: 1px solid var(--border);
  background: var(--surface2);
}
.pane-title { font-size: 0.67rem; font-weight: 700; text-transform: uppercase; letter-spacing: .1em; color: var(--text3); }
.pane-body { flex: 1; overflow: hidden; display: flex; flex-direction: column; min-height: 0; }