.lesson-main {
  max-width: 820px;
}
.lesson-header {
  margin-bottom: 54px;
}
.lesson-header .intro {
  max-width: 680px;
}
.lesson-question {
  margin: 0 0 30px;
  font-size: clamp(25px, 4vw, 36px);
}
.model-note {
  margin: -2px 0 14px;
  color: var(--muted);
  font-size: 13px;
}
.curriculum-model {
  margin: 30px -34px 22px;
}
.curriculum-model .figure-shell {
  border-radius: 2px;
}
.curriculum-model .figure-top {
  min-height: 54px;
}
.curriculum-model .figure-top label {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}
.curriculum-model select {
  max-width: 330px;
  padding: 7px 26px 7px 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper);
  font: 12px/1.4 var(--mono);
}
.curriculum-model .diagram {
  aspect-ratio: 760/370;
}
.diagram .ref rect {
  fill: var(--orange-bg);
  stroke: var(--orange);
}
.diagram .commit rect {
  fill: var(--green-bg);
  stroke: var(--green);
}
.diagram .content rect {
  fill: var(--blue-bg);
  stroke: var(--blue);
}
.diagram .plain rect {
  fill: var(--paper);
  stroke: var(--line);
}
.diagram .gone {
  opacity: .28;
}
.diagram .gone rect {
  fill: var(--wash);
  stroke-dasharray: 5 4;
}
.diagram .emphasis rect {
  stroke-width: 2;
}
.diagram .edge-label {
  font-size: 9px;
  fill: var(--muted);
}
.result-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}
.result-strip div {
  min-width: 0;
  padding: 10px 14px;
  border-right: 1px solid var(--line);
}
.result-strip div:last-child {
  border-right: 0;
}
.result-strip small,
.result-strip strong {
  display: block;
}
.result-strip small {
  color: var(--muted);
  font: 9px/1.5 var(--mono);
  letter-spacing: .04em;
  text-transform: uppercase;
}
.result-strip strong {
  margin-top: 2px;
  font: 11px/1.55 var(--mono);
  overflow-wrap: anywhere;
}
.lesson-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 46px 0 74px;
  background: var(--line);
  border: 1px solid var(--line);
}
.lesson-links a {
  min-height: 86px;
  padding: 18px;
  background: var(--paper);
  text-decoration: none;
}
.lesson-links strong,
.lesson-links span {
  display: block;
}
.lesson-links span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}
.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}
.lesson-nav a {
  text-decoration: none;
}
.lesson-nav a:last-child {
  text-align: right;
}
.lesson-nav span,
.lesson-nav b {
  display: block;
}
.lesson-nav span {
  color: var(--muted);
  font: 10px/1.6 var(--mono);
}
.lesson-nav b {
  font-size: 14px;
}
.no-js-model {
  margin: 20px 0;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--wash);
  font: 12px/1.7 var(--mono);
  white-space: pre-wrap;
}
@media (max-width: 700px) {
  .curriculum-model {
    margin-inline: -8px;
  }
  .curriculum-model .figure-top {
    display: grid;
    gap: 8px;
  }
  .curriculum-model .figure-top label {
    display: grid;
    gap: 4px;
  }
  .curriculum-model select {
    width: 100%;
    max-width: none;
  }
  .curriculum-model .diagram {
    aspect-ratio: 390/500;
  }
  .result-strip {
    grid-template-columns: 1fr;
  }
  .result-strip div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .result-strip div:last-child {
    border-bottom: 0;
  }
  .lesson-links {
    grid-template-columns: 1fr;
  }
  .lesson-nav {
    gap: 16px;
  }
}
@media (max-width: 360px) {
  .transport .play {
    min-width: 56px;
  }
  .transport output {
    min-width: 38px;
  }
  .lesson-nav b {
    font-size: 12px;
  }
}