.lt-page-title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.55rem;
  margin: 0 0 0.35rem;
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.35;
}
.lt-lesson-badge-icon {
  font-size: 1.25rem;
  line-height: 1;
}
.lt-lesson-no {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--lt-accent);
  white-space: nowrap;
}
.lt-title-text {
  font-weight: 700;
}
.lt-title-text.lt-lao-script {
  font-family: "Noto Sans Lao", "Phetsarath OT", sans-serif;
  color: var(--lt-lao);
  font-size: 1.3rem;
}
.lt-lesson-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.75rem 1rem;
  margin: 0 0 1rem;
}
.lt-lesson-toolbar .lt-search-wrap {
  display: block;
  flex: 1;
  min-width: 12rem;
  margin: 0;
}
.lt-play-all-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--lt-accent);
  border-radius: 8px;
  background: var(--lt-accent-soft);
  color: var(--lt-text);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
}
.lt-play-all-btn:hover {
  background: #f5ebe0;
  border-color: #9a3412;
}
.lt-play-all-btn.is-playing {
  background: var(--lt-accent);
  border-color: var(--lt-accent);
  color: #fff;
}
.lt-play-all-icon { font-size: 0.75rem; }
.lt-search-wrap { display: block; margin: 0 0 1rem; }
.lt-search {
  width: 100%;
  max-width: 28rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--lt-border);
  border-radius: 8px;
  font-size: 1rem;
}

/* Mỗi nhóm = thẻ: tiêu đề cố định + bảng bên dưới (không sticky che dòng) */
.lt-topic-block {
  margin-bottom: 1.25rem;
  background: var(--lt-surface);
  border: 1px solid var(--lt-border);
  border-radius: 10px;
  overflow: hidden;
}
.lt-topic-h {
  margin: 0;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  color: var(--lt-accent);
  background: #faf8f5;
  border-bottom: 1px solid var(--lt-border);
}
.lt-table-wrap {
  overflow-x: auto;
  background: var(--lt-surface);
}
.lt-sentences {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.lt-sentences th,
.lt-sentences td {
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--lt-border);
  vertical-align: middle;
  text-align: left;
}
.lt-sentences thead th {
  position: static;
  background: #f3efe8;
  font-size: 0.75rem;
  color: var(--lt-muted);
  text-transform: uppercase;
  font-weight: 600;
  vertical-align: middle;
  text-align: center;
}
.lt-sentences thead th.col-num {
  text-align: center;
}
.lt-sentences tbody td.col-lao,
.lt-sentences tbody td.col-lr,
.lt-sentences tbody td.col-vr {
  vertical-align: middle;
  text-align: center;
}
.lt-sentences tbody td.col-lao {
  line-height: 1.45;
}
.lt-sentences thead th.col-vi,
.lt-sentences thead th.col-lao,
.lt-sentences thead th.col-lr,
.lt-sentences thead th.col-vr {
  text-align: center;
}
.lt-sentences tbody tr:last-child td {
  border-bottom: none;
}
.col-num {
  width: 1%;
  white-space: nowrap;
  padding: 0.4rem 0.25rem !important;
  vertical-align: middle !important;
  text-align: center;
}
.lt-num {
  flex: 0 0 auto;
  min-width: 0;
  color: var(--lt-muted);
  font-size: 0.82rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: center;
  line-height: 1;
}
.lt-play-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  border: 1px solid var(--lt-accent);
  border-radius: 50%;
  background: #fff;
  color: var(--lt-accent);
  line-height: 0;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.1s;
}
.lt-play-icon {
  display: block;
}
.lt-play-btn:hover {
  background: var(--lt-accent-soft);
  border-color: var(--lt-accent);
}
.lt-play-btn.is-playing,
tr.is-speaking .lt-play-btn {
  background: var(--lt-accent);
  border-color: var(--lt-accent);
  color: #fff;
}
tr.is-speaking {
  background: #fff8f0;
}
.lt-lao,
.lt-page-title-lao {
  font-family: "Noto Sans Lao", "Phetsarath OT", sans-serif;
  font-size: 1.08rem;
  color: var(--lt-lao);
  font-weight: 500;
}
.lt-roman { font-style: italic; color: #4a5d42; font-size: 0.88rem; }
.lt-note { font-size: 0.82rem; color: var(--lt-muted); }
.lt-note-row td {
  border-bottom: 1px solid var(--lt-border);
  padding-top: 0.35rem;
  padding-bottom: 0.5rem;
  vertical-align: middle;
}