.lesson-mode .controls,
.lesson-mode .result-count {
  display: none;
}

.lesson-page {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.lesson-page-head {
  margin: 0 0 8px;
  padding: 10px 14px 12px;
  border: 1px solid #c7d7fe;
  border-radius: 16px;
  background: #eef4ff;
  box-shadow: 0 8px 20px rgba(37, 99, 235, .08);
}

.lesson-page-kicker {
  margin: 0 0 4px;
  color: #1d4ed8;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.lesson-page-head h3 {
  margin: 0;
  font-size: clamp(22px, 2.4vw, 32px);
  line-height: 1.2;
}

.lesson-page-goal {
  margin: 0;
  color: #1e3a5f;
  font-size: 16px;
  line-height: 1.45;
}

.lesson-watch,
.lesson-practice {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface);
}

.lesson-watch {
  border-color: #e7ecf5;
  box-shadow: 0 18px 50px rgba(26, 41, 77, .12);
}

.oge-notebook-frame {
  display: block;
  width: 100%;
  height: clamp(650px, 80svh, 760px);
  border: 0;
  background: #fff;
}

@media (max-width: 720px) {
  .oge-notebook-frame {
    height: clamp(590px, 84svh, 700px);
  }

  .game-lesson .lesson-watch {
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(26, 41, 77, 0.08);
  }
}

.lesson-watch > header,
.lesson-practice > header {
  padding: 13px 18px;
  font-size: 13px;
  font-weight: 850;
  letter-spacing: .04em;
}

.lesson-watch.integer-subtraction-game-wrap > header {
  color: #1d4ed8;
  background: #dbeafe;
}

.lesson-homework-gate {
  padding: 14px 18px 4px;
  color: #475467;
  font-size: 15px;
  line-height: 1.5;
}

.lesson-practice.is-homework-locked {
  display: none;
}
.lesson-practice:not(.is-homework-locked) .lesson-homework-gate {
  display: none;
}

[data-homework-item].is-homework-locked .homework-lock-note {
  display: block;
  margin: 12px 12px 0;
  padding: 10px 12px;
  border-radius: 12px;
  background: #f8fafc;
  border: 1px solid #e4e7ec;
  color: #475467;
  font-size: 14px;
  font-weight: 650;
}

[data-homework-item].is-homework-locked [data-student-answer],
[data-homework-item].is-homework-locked .card-actions {
  pointer-events: none;
  opacity: 0.42;
}

[data-homework-item].is-homework-locked [data-student-answer] input,
[data-homework-item].is-homework-locked [data-student-answer] button {
  cursor: not-allowed;
}

.homework-lock-note {
  display: none;
}

.lesson-practice > header {
  color: #334155;
  background: #f8fafc;
  border-bottom: 1px solid var(--line);
}

.lesson-watch-problem {
  padding: 18px 22px 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  line-height: 1.55;
}

.lesson-practice-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 12px 16px;
}

.lesson-practice-group + .lesson-practice-group {
  border-top: 1px solid var(--line);
}

.lesson-practice-skill {
  margin: 4px 6px 2px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.inline-player {
  padding: 0 12px 16px;
}

.inline-player-stage-wrap {
  position: relative;
  overflow: hidden;
  border: 1px solid #dbeafe;
  border-radius: 16px;
  background: linear-gradient(145deg, #f8fbff, #eef4ff);
}

.inline-player-stage.solution-animation {
  width: 100%;
  box-shadow: none;
  background: transparent;
}

.inline-player-watch {
  position: absolute;
  z-index: 2;
  right: 16px;
  bottom: 16px;
  display: none;
  min-height: 46px;
  padding: 10px 18px;
  border: 0;
  border-radius: 12px;
  color: #fff;
  background: var(--accent);
  font-size: 15px;
  font-weight: 800;
  box-shadow: 0 10px 24px rgba(40, 85, 217, .28);
  cursor: pointer;
}

.inline-player.is-waiting .inline-player-watch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.inline-player-watch:hover {
  filter: brightness(.96);
}

.inline-player .solution-controls {
  justify-content: flex-start;
  min-height: 0;
  margin-top: 10px;
  padding: 8px 4px 0;
  border: 0;
  background: transparent;
}

.inline-player .solution-speed,
.inline-player .solution-step {
  min-width: 0;
}

.lesson-practice .place-value-card,
.lesson-practice .place-shift-card {
  padding-top: 12px;
}

.lesson-practice .place-value-card .task-row-num,
.lesson-practice .place-shift-card .task-row-num {
  display: block;
  margin: 0 4px 6px;
}

.lesson-topic {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.lesson-topic-title {
  margin: 4px 2px 0;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.25;
}

.inline-player.is-compact .solution-controls {
  justify-content: center;
}

@media (max-width: 720px) {
  .inline-player .solution-controls {
    flex-wrap: wrap;
  }
  .inline-player-watch {
    right: 10px;
    bottom: 10px;
  }
}