.source-group-material {
  margin: 0 0 14px;
  padding: 12px;
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.6;
  max-height: 350px;
  overflow: auto;
}

.source-group-caption {
  margin-bottom: 8px;
  color: var(--blue);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: .03em;
}

.source-group-content-body > :first-child { margin-top: 0; }
.source-group-content-body > :last-child { margin-bottom: 0; }
.source-group-content-body h1,
.source-group-content-body h2,
.source-group-content-body h3,
.source-group-content-body h4,
.source-group-content-body h5,
.source-group-content-body h6 { margin: 7px 0; color: var(--ink); font-size: 12px; }
.source-group-content-body p { margin: 7px 0; white-space: pre-wrap; }
.source-group-content-body ul,
.source-group-content-body ol { padding-left: 20px; }
.source-group-content-body table { width: 100%; border-collapse: collapse; margin: 8px 0; font-size: 10px; }
.source-group-content-body th,
.source-group-content-body td { border: 1px solid var(--line); padding: 6px; vertical-align: top; }
.source-group-content-body img { display: block; width: auto; max-width: 100%; max-height: 240px; object-fit: contain; margin: 8px auto; border-radius: 6px; }

.source-question-gap { display: inline-block; padding: 0 3px; border-bottom: 1px solid #9ba9be; }
.source-question-gap.is-active { background: #fff0b8; border-radius: 3px; color: var(--ink); font-weight: 800; }
.source-group-plain-text { margin: 0; white-space: pre-wrap; font: inherit; }
.source-group-options { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--line); }
.source-group-options summary { color: var(--blue); font-size: 10px; font-weight: 800; cursor: pointer; }
.source-group-options ul { margin: 6px 0 0; padding-left: 20px; }