.source-reading,
.source-reading-catalog,
.course-syllabus,
.course-reading {
  color: var(--ink);
  line-height: 1.85;
}
.source-reading {
  margin: 3rem 0;
  padding-top: 2rem;
  border-top: 2px solid var(--green);
}
.lesson-reading-contents {
  margin: 1.5rem 0 2.5rem;
  padding: 1rem 0;
  border-block: 1px solid var(--line);
}
.lesson-reading-contents summary,
.personal-reading-support summary,
.personal-reading-practice summary {
  cursor: pointer;
  font-weight: 600;
  line-height: 1.75;
}
.lesson-reading-contents nav {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.2rem;
}
.lesson-reading-contents a {
  white-space: normal;
  overflow-wrap: anywhere;
  font-size: 0.88rem;
}
.personal-reading-support {
  margin: 1.7rem 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}
.personal-reading-sources small {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
  margin: 0.5rem 0 1.2rem;
}
.personal-reading-glossary dt {
  font-weight: 600;
  margin-top: 1.2rem;
}
.personal-reading-glossary dd {
  margin: 0.4rem 0 1rem;
}
.personal-reading-practice {
  margin: 1.5rem 0;
}
.lesson-technique-links {
  margin: 2.5rem 0;
}
.lesson-deep-study [id] {
  scroll-margin-top: 85px;
}
.lesson-deep-study .course-case h3 {
  font-size: 1.2rem;
  line-height: 1.7;
  margin: 2.5rem 0 1rem;
}
.lesson-deep-study .course-case h4 {
  margin: 1.7rem 0 0.7rem;
  line-height: 1.7;
}
.reading-label {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--green);
  font: 600 0.72rem/1.7 var(--sans);
  letter-spacing: 0.04em;
}
.source-reading-heading h2 {
  margin-top: 0.6rem;
}
.source-reading p,
.source-reading-catalog p,
.course-syllabus p,
.course-reading p {
  margin: 1.15rem 0;
}
.source-reading-part {
  margin: 2.8rem 0;
  scroll-margin-top: 145px;
}
.source-reading-part h3 {
  margin: 0 0 1rem;
  font-size: 1.2rem;
  line-height: 1.6;
}
.source-commentary {
  margin-top: 1.4rem;
  padding-left: 1.1rem;
  border-left: 2px solid var(--line);
}
.source-commentary .reading-label {
  margin-bottom: 0.3rem;
  color: var(--muted);
}
.source-commentary p:first-of-type {
  margin-top: 0.5rem;
}
.source-scope-note {
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.8;
}
.source-reading-exercise {
  padding: 1rem 0;
  border-block: 1px solid var(--line);
}
.source-reading li,
.course-reading li {
  margin: 0.6rem 0;
}
.source-limits,
.reading-source-record,
.lecture-glossary {
  margin: 1.5rem 0;
  border-top: 1px solid var(--line);
  padding: 1rem 0;
}
.source-limits summary,
.reading-source-record summary,
.lecture-glossary summary {
  cursor: pointer;
  font-weight: 600;
}
.source-limits,
.source-footnotes {
  font-size: 0.83rem;
}
.source-reading sup a,
.course-reading sup a,
.course-reading a,
.source-reading-catalog a {
  color: var(--green);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.source-visual img {
  max-width: min(280px, 100%);
  max-height: 230px;
}
.source-visual[data-kind="book-cover"] img {
  max-width: 170px;
  max-height: 230px;
}
.course-title > .number-label {
  display: block;
  margin: 1.5rem 0 0.7rem;
}
.course-title h1 {
  max-width: 27ch;
  word-break: keep-all;
}
.course-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-block: 1px solid var(--green);
  margin: 2rem 0;
  padding: 1.3rem 0;
  gap: 1.4rem;
}
.course-facts strong {
  display: block;
  font: 500 1.65rem/1.5 var(--serif);
}
.course-facts span {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.7;
}
.course-syllabus {
  max-width: 78ch;
  margin: 3rem auto;
}
.course-syllabus h2,
.course-reading h2 {
  margin: 3rem 0 1.15rem;
  font-size: 1.6rem;
  line-height: 1.6;
  word-break: keep-all;
}
.course-syllabus h3,
.course-reading h3 {
  margin: 2.25rem 0 0.9rem;
  font-size: 1.2rem;
  line-height: 1.65;
}
.course-reading h4 {
  margin: 1.75rem 0 0.75rem;
  font-size: 1rem;
  line-height: 1.65;
}
.course-rhythm {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding-left: 1.3rem;
  gap: 0.6rem 2rem;
}
.course-rhythm strong {
  color: var(--green);
  margin-right: 0.6rem;
}
.course-assessment {
  list-style: none;
  padding: 0;
}
.course-assessment li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding: 0.5rem 0;
}
.course-semester {
  margin: 4rem 0;
}
.course-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 2.5rem;
}
.course-week {
  padding: 1.8rem 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}
.course-week h3 {
  margin: 0.8rem 0;
  font-size: 1.25rem;
  line-height: 1.6;
  word-break: keep-all;
}
.course-week h3 a {
  color: inherit;
  text-decoration: none;
}
.course-week p {
  font-size: 0.9rem;
  line-height: 1.85;
}
.course-week small {
  display: block;
  margin: 1rem 0;
  font-size: 0.73rem;
  color: var(--muted);
}
.course-layout {
  display: grid;
  grid-template-columns: 225px minmax(0, 1fr);
  gap: 3rem;
  align-items: start;
}
.course-rail {
  position: sticky;
  top: 120px;
  max-height: calc(100vh - 145px);
  overflow-y: auto;
  font-size: 0.79rem;
}
.course-rail nav {
  display: grid;
  gap: 0.1rem;
}
.course-rail a {
  padding: 0.55rem 0;
  line-height: 1.65;
  white-space: normal;
  color: var(--muted);
  text-decoration: none;
  overflow-wrap: anywhere;
}
.course-rail a:hover {
  color: var(--green);
  text-decoration: underline;
}
.course-contents > summary {
  padding: 0.6rem 0;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 1px solid var(--line);
}
.course-reading {
  min-width: 0;
  max-width: 78ch;
}
.course-section,
.course-reading .source-reading-part {
  scroll-margin-top: 130px;
}
.course-reading .source-reading-part {
  border-top: 1px solid var(--line);
  padding-top: 0.5rem;
}
.course-reading .source-reading-part h2 {
  margin-top: 1.8rem;
}
.lecture-meta {
  font-size: 0.8rem;
  color: var(--muted);
}
.lecture-reading-list > div {
  margin: 1.3rem 0;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}
.lecture-reading-list p {
  margin: 0.55rem 0;
  font-size: 0.9rem;
}
.lecture-reading-list small {
  color: var(--muted);
  font-size: 0.77rem;
  line-height: 1.75;
}
.course-case {
  margin: 2rem 0;
}
.lecture-glossary dl {
  display: grid;
  gap: 1rem;
}
.lecture-glossary dt {
  font-weight: 600;
}
.lecture-glossary dd {
  margin: 0.4rem 0 0;
}
.lecture-activities {
  padding-left: 1.4rem;
}
.lecture-activities h4 {
  margin-top: 1.1rem;
}
.rubric-wrap {
  max-width: 100%;
  overflow-x: auto;
}
.lecture-rubric {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  line-height: 1.75;
  min-width: 560px;
}
.lecture-rubric th,
.lecture-rubric td {
  border-bottom: 1px solid var(--line);
  padding: 0.8rem 0.7rem;
  vertical-align: top;
  text-align: left;
}
.lecture-rubric thead th {
  background: var(--surface);
}
.lecture-rubric th:nth-child(1) {
  min-width: 6rem;
}
.lecture-rubric td:nth-child(2) {
  white-space: nowrap;
}
.lecture-related {
  display: grid;
  gap: 0.7rem;
}
.lecture-related button {
  border: 0;
  padding: 0;
  background: transparent;
  text-align: left;
  color: var(--green);
  font-size: 0.83rem;
  line-height: 1.7;
  cursor: pointer;
  white-space: normal;
}
.lecture-related a {
  font-size: 0.83rem;
  line-height: 1.7;
}
.lecture-pagination {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  margin-top: 3rem;
  padding: 1.5rem 0;
  border-top: 2px solid var(--green);
}
.lecture-pagination a {
  max-width: 47%;
  font-size: 0.87rem;
  line-height: 1.8;
  white-space: normal;
}
.course-reading .study-footnotes small {
  display: block;
  margin-top: 0.4rem;
}
.technique-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1rem 0 3rem;
}
.technique-nav a {
  white-space: normal;
  border: 1px solid var(--line);
  padding: 0.6rem 0.85rem;
  font-size: 0.8rem;
}
.technique-reading {
  margin-inline: auto;
}
.technique-directions {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0;
}
.technique-directions dt {
  font-weight: 600;
  color: var(--green);
}
.technique-directions dd {
  margin: 0.4rem 0 0;
}
.technique-example {
  margin: 2.6rem 0;
  border-top: 1px solid var(--line);
}
.scene-resource {
  display: grid;
  gap: 0.8rem;
  margin: 1.5rem 0;
}
.scene-resource small {
  color: var(--muted);
  font-size: 0.75rem;
}
.scene-player-slot iframe {
  width: 100%;
  aspect-ratio: 16/9;
  height: auto;
  border: 0;
}
.scene-resource .btn.secondary {
  justify-self: start;
  white-space: normal;
}
.optics-lab {
  max-width: 78ch;
  margin: 2.5rem auto;
  padding: 1.6rem 0;
  border-block: 1px solid var(--line);
}
.optics-lab p {
  line-height: 1.85;
}
.optics-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}
.optics-controls label {
  display: grid;
  gap: 0.5rem;
  font-size: 0.83rem;
  color: var(--green);
  min-width: 0;
}
.optics-controls select {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--surface);
  padding: 0.6rem;
  font-size: 0.79rem;
}
.optics-phase-label {
  grid-column: 1/-1;
}
.optics-controls input {
  width: 100%;
  accent-color: var(--green);
}
.optics-lab canvas {
  display: block;
  width: 100%;
  height: auto;
  background: var(--surface);
}
.optics-values {
  font-size: 0.79rem;
  line-height: 1.8;
  color: var(--muted);
}
.optics-caption {
  font-size: 0.83rem;
  line-height: 1.8;
  color: var(--green);
}
.course-callout .number-label {
  color: var(--gold);
}
@media (max-width: 1000px) {
  .course-layout {
    grid-template-columns: 185px minmax(0, 1fr);
    gap: 1.5rem;
  }
}
@media (max-width: 760px) {
  .course-facts {
    grid-template-columns: 1fr 1fr;
    gap: 1.1rem;
  }
  .course-facts strong {
    font-size: 1.4rem;
  }
  .course-grid,
  .course-rhythm,
  .course-layout,
  .optics-controls {
    grid-template-columns: 1fr;
  }
  .course-rail {
    position: static;
    max-height: none;
    overflow: visible;
    margin-bottom: 1rem;
  }
  .course-contents > summary {
    padding: 0.9rem 0;
  }
  .course-rail a {
    font-size: 0.83rem;
  }
  .course-reading h2,
  .course-syllabus h2 {
    margin-top: 2.6rem;
    font-size: 1.4rem;
  }
  .course-reading h3,
  .course-syllabus h3 {
    margin-top: 2rem;
    font-size: 1.1rem;
  }
  .course-section,
  .course-reading .source-reading-part {
    scroll-margin-top: 155px;
  }
  .source-reading-part {
    margin: 2.3rem 0;
  }
  .source-commentary {
    padding-left: 0.8rem;
  }
  .lecture-pagination {
    gap: 1rem;
  }
}