.conv-segment {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 1.1rem; overflow: hidden; box-shadow: var(--shadow-sm);
}
.conv-segment-header {
  padding: 0.75rem 1.3rem; font-weight: 700; font-size: 0.82rem; font-family: var(--font-sans);
  background: var(--paper-2); border-bottom: 1px solid var(--border); color: var(--ink);
}
.conv-segment-header .heading-en { font-weight: 400; color: var(--text-muted); }
.conv-segment-body { padding: 1.1rem 1.5rem; }
.conv-line { display: flex; gap: 0.9rem; align-items: baseline; padding: 0.55rem 0; border-bottom: 1px dotted var(--border-light); }
.conv-line:last-child { border-bottom: none; }
.conv-speaker { display: flex; flex-direction: column; align-items: center; gap: 0.2rem; width: 38px; flex-shrink: 0; }
.conv-speaker .spk-initial {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.75rem; font-family: var(--font-sans); line-height: 1;
}
.conv-speaker .spk-name {
  font-size: 0.6rem; color: var(--text-muted);
  font-family: var(--font-sans); font-weight: 500;
  text-align: center; line-height: 1.1;
  max-width: 38px; overflow: hidden; text-overflow: ellipsis;
}
.conv-text { flex: 1; min-width: 0; }
.conv-text .jp { font-size: 1rem; font-family: var(--font-jp); color: var(--ink); display: block; line-height: 2.4; }
.conv-text .en { font-size: 0.78rem; color: var(--text-muted); display: block; font-family: var(--font-sans); margin-top: 0.2rem; }
.conv-line hr { margin: 0.5rem 0; border: none; border-top: 1px solid var(--border-light); }
.drill-pattern { display: grid; grid-template-columns: 1fr 1fr; gap: 0.6rem; margin: 0.85rem 0; }
.drill-item { padding: 0.65rem 1rem; background: var(--card-2); border-radius: 3px; font-size: 0.85rem; border: 1px solid var(--border); font-family: var(--font-jp); }
.drill-item .cue { color: var(--text-secondary); font-size: 0.75rem; font-family: var(--font-sans); }
.drill-item .response { font-weight: 700; margin-top: 0.25rem; color: var(--ink); }
.video-wrap { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; border-radius: 3px; margin-top: 1rem; border: 1px solid var(--border); }
.video-wrap iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }