.knowledge-detail {
  width: min(900px, 100%);
  margin: 12px auto 48px;
}

.knowledge-head {
  padding: 42px 46px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.knowledge-head h1 {
  max-width: 760px;
  margin: 0;
  font-family: "STZhongsong", "SimSun", serif;
  font-size: 34px;
  line-height: 1.4;
  letter-spacing: 0;
}

.answer-lead {
  margin: 20px 0 0;
  padding: 18px 20px;
  color: #294b48;
  background: var(--mint);
  border-left: 4px solid var(--teal);
  font-size: 15px;
}

.review-line {
  display: flex;
  gap: 20px;
  margin-top: 16px;
  color: var(--muted);
  font-size: 10px;
}

.knowledge-section {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 8px;
  margin-top: 10px;
  padding: 28px 34px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
}

.knowledge-section > span {
  color: var(--gold);
  font: 700 12px Georgia, serif;
}

.knowledge-section h2 {
  margin: 0 0 7px;
  font-size: 18px;
}

.knowledge-section p {
  margin: 0;
  color: #4d625f;
  font-size: 13px;
}

.knowledge-detail > .trust {
  margin: 16px 0 0;
}

.related-knowledge {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.related-knowledge a,
.teacher-card {
  min-width: 0;
  padding: 16px 17px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
}

.related-knowledge a:hover,
.teacher-card:hover {
  background: var(--mint);
  border-color: #77aaa5;
}

.related-knowledge span,
.related-knowledge b,
.related-knowledge small,
.teacher-card span,
.teacher-card b,
.teacher-card small {
  display: block;
}

.related-knowledge span,
.teacher-card span {
  color: var(--teal);
  font-size: 10px;
}

.related-knowledge b {
  margin: 4px 0;
  font-size: 13px;
  line-height: 1.5;
}

.related-knowledge small,
.teacher-card small {
  color: var(--muted);
  font-size: 10px;
}

.question-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 24px 28px;
  color: #fff;
  background: #176d68;
  border-radius: 8px;
}

.question-action h2,
.question-action p {
  margin: 0;
}

.question-action h2 {
  font-size: 18px;
}

.question-action p {
  margin-top: 4px;
  color: #d9efec;
  font-size: 11px;
}

.question-action .primary-cta {
  flex: 0 0 auto;
  margin: 0;
  color: var(--teal);
  background: #fff;
}

.teacher-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.teacher-card b {
  margin: 6px 0 4px;
  font-size: 17px;
}

@media (max-width: 860px) {
  .knowledge-head {
    padding: 30px 22px;
  }

  .knowledge-head h1 {
    font-size: 27px;
  }

  .answer-lead {
    padding: 16px;
    font-size: 14px;
  }

  .review-line {
    display: grid;
    gap: 3px;
  }

  .knowledge-section {
    grid-template-columns: 36px 1fr;
    padding: 22px 18px;
  }

  .related-knowledge,
  .teacher-grid {
    grid-template-columns: 1fr;
  }

  .question-action {
    display: block;
  }

  .question-action .primary-cta {
    margin-top: 16px;
  }
}