.course-body {
  background: #eef5f4;
}

.course-main {
  padding-top: 112px;
}

.course-hero,
.course-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.course-hero {
  padding: 62px 0 38px;
}

.course-hero h1 {
  width: min(940px, 100%);
  font-size: clamp(3rem, 6.8vw, 6.4rem);
}

.course-hero p {
  width: min(760px, 100%);
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.32rem);
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.course-meta span {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  border: 1px solid rgba(18, 63, 174, 0.24);
  border-radius: 8px;
  padding: 0 12px;
  color: var(--teal-dark);
  background: var(--white);
  font-weight: 900;
}

.course-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
  padding-bottom: 72px;
}

.course-sidebar {
  position: sticky;
  top: 104px;
  display: grid;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--white);
  box-shadow: 0 14px 36px rgba(28, 46, 56, 0.07);
}

.course-sidebar strong {
  margin-bottom: 6px;
  color: var(--ink);
}

.course-sidebar a {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
  min-height: 42px;
  color: #294365;
  font-size: 0.92rem;
  font-weight: 800;
}

.course-sidebar a span {
  display: inline-grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 8px;
  color: var(--white);
  background: var(--teal-dark);
  font-size: 0.76rem;
}

.course-content {
  display: grid;
  gap: 22px;
}

.course-chapter {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(24px, 4vw, 42px);
  background: var(--white);
  box-shadow: 0 14px 36px rgba(28, 46, 56, 0.07);
}

.chapter-heading {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.chapter-heading > span {
  display: inline-grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 8px;
  color: var(--white);
  background: var(--teal-dark);
  font-weight: 900;
}

.chapter-heading h2 {
  margin-bottom: 10px;
  font-size: clamp(2rem, 4vw, 4rem);
}

.chapter-heading p {
  color: var(--muted);
  font-size: 1.08rem;
}

.video-slot {
  display: grid;
  gap: 8px;
  margin: 26px 0;
  border: 1px dashed rgba(18, 63, 174, 0.35);
  border-radius: 8px;
  padding: 22px;
  background: #eef5ff;
}

.video-slot span,
.course-question h4,
.final-question h4 {
  margin: 0;
  color: var(--red);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.video-slot strong {
  color: var(--ink);
}

.video-slot p {
  margin: 0;
  color: var(--muted);
}

.video-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(18, 63, 174, 0.2);
  border-radius: 8px;
  background: #10244f;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.chapter-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.3fr);
  gap: 18px;
}

.study-note,
.course-question,
.final-question,
.answer-key,
.summary-card,
.summary-grid article {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  background: #fbfdfc;
}

.study-note h3,
.chapter-quiz h3,
.answer-key h3,
.summary-card h3,
.summary-grid h3 {
  margin-top: 0;
}

.study-note h4 {
  margin: 22px 0 10px;
  color: var(--ink);
  font-size: 1.02rem;
}

.study-note p,
.course-question p,
.final-question p,
.answer-key li,
.summary-grid p,
.summary-card li {
  color: #304653;
}

.study-note p {
  margin: 0 0 10px;
}

.guide-list {
  margin: 0 0 12px;
  padding-left: 22px;
}

.study-note li + li,
.answer-rationale li + li,
.answer-key li + li,
.summary-card li + li {
  margin-top: 8px;
}

.chapter-quiz {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.course-question {
  display: grid;
  gap: 12px;
}

.answer-options,
.final-question ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 24px;
}

.answer-options li,
.final-question li {
  padding-left: 4px;
  color: #304653;
}

.answer-rationale {
  border-left: 4px solid var(--teal-dark);
  padding: 14px 16px;
  background: #eef5ff;
}

.answer-rationale ul {
  margin-bottom: 0;
}

.final-question-grid,
.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.answer-key,
.summary-card {
  margin-top: 22px;
  background: #eef5ff;
}

.clinical-summary {
  background: #10244f;
}

.clinical-summary .chapter-heading h2,
.clinical-summary .chapter-heading p,
.clinical-summary .summary-card,
.clinical-summary .summary-grid article,
.clinical-summary .summary-grid p,
.clinical-summary .summary-card li {
  color: var(--white);
}

.clinical-summary .summary-card,
.clinical-summary .summary-grid article {
  border-color: rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.08);
}

.continue-learning {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto 72px;
  padding-top: 0;
}

.continue-learning .section-heading {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
}

.continue-learning-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.continue-card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--white);
  box-shadow: 0 14px 36px rgba(28, 46, 56, 0.07);
}

.continue-card span {
  color: var(--red);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.continue-card h3,
.continue-card p {
  margin: 0;
}

.continue-card h3 {
  font-size: 1.12rem;
}

.continue-card p {
  color: var(--muted);
  font-size: 0.94rem;
}

@media (max-width: 980px) {
  .course-shell,
  .chapter-grid,
  .final-question-grid,
  .summary-grid,
  .continue-learning-grid {
    grid-template-columns: 1fr;
  }

  .course-sidebar {
    position: static;
  }
}

@media (max-width: 620px) {
  .course-hero,
  .course-shell,
  .continue-learning {
    width: calc(100% - 28px);
  }

  .chapter-heading {
    grid-template-columns: 1fr;
  }

  .course-meta span,
  .course-sidebar a {
    width: 100%;
  }
}