/* 2026-11-12 整合授课版：每章的目标、图解、操作和验收保持同一阅读节奏。 */
.markdown-body .lesson-upgrade {
  --lesson-ink: var(--text);
  --lesson-muted: var(--text-secondary);
  --lesson-line: var(--border);
  color: var(--lesson-ink);
  font-size: 1.03rem;
  line-height: 1.78;
}
.markdown-body .lesson-upgrade > * + * { margin-top: 1.5rem; }
.markdown-body .lesson-upgrade h2 { margin: 0 0 .8rem; font-size: clamp(1.35rem, 2.3vw, 1.7rem); line-height: 1.3; }
.markdown-body .lesson-upgrade h3 { margin: 0 0 .55rem; font-size: 1.08rem; line-height: 1.4; }
.markdown-body .lesson-upgrade p { margin: .5rem 0; line-height: 1.78; }
.markdown-body .lesson-upgrade strong { color: var(--lesson-ink); }
.markdown-body .lesson-upgrade .lesson-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.3rem, 3vw, 2rem);
  border: 1px solid var(--lesson-line);
  border-radius: 18px;
  background: linear-gradient(130deg, var(--primary-soft), var(--surface) 70%);
}
.markdown-body .lesson-upgrade .lesson-hero::before {
  content: "";
  position: absolute;
  right: -4.5rem;
  top: -6rem;
  width: 14rem;
  height: 14rem;
  border: 1px solid var(--primary);
  border-radius: 50%;
  opacity: .16;
  pointer-events: none;
}
.markdown-body .lesson-upgrade .lesson-hero > * { position: relative; }
.markdown-body .lesson-upgrade .lesson-hero p { max-width: 66ch; font-size: 1.06rem; }
.markdown-body .lesson-upgrade .lesson-visual {
  overflow: auto;
  padding: clamp(1rem, 2vw, 1.4rem);
  border: 1px solid var(--lesson-line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: 0 10px 35px rgba(44, 38, 94, .05);
}
.markdown-body .lesson-upgrade .lesson-visual svg {
  display: block;
  width: 100%;
  min-width: 460px;
  max-height: 440px;
  height: auto;
  margin: auto;
}
.markdown-body .lesson-upgrade .lesson-visual figcaption {
  margin-top: .6rem;
  color: var(--lesson-muted);
  font-size: .88rem;
  line-height: 1.6;
}
.markdown-body .lesson-upgrade .lesson-case,
.markdown-body .lesson-upgrade .lesson-steps,
.markdown-body .lesson-upgrade .lesson-output,
.markdown-body .lesson-upgrade .lesson-check,
.markdown-body .lesson-upgrade .lesson-source {
  padding: clamp(1rem, 2.3vw, 1.35rem);
  border: 1px solid var(--lesson-line);
  border-radius: 15px;
  background: var(--surface);
}
.markdown-body .lesson-upgrade .lesson-case { border-left: 4px solid #d29b42; background: color-mix(in srgb, var(--surface), #ffedcb 28%); }
.markdown-body .lesson-upgrade .lesson-observation-experiment > pre,
.markdown-body .lesson-upgrade .lesson-observation-experiment details pre {
  box-sizing: border-box;
  max-width: 100%;
  margin: 1rem 0;
  padding: clamp(.95rem, 2vw, 1.3rem);
  background: var(--surface);
  color: var(--lesson-ink);
  border: 1px solid var(--lesson-line);
  border-left: 4px solid var(--primary);
  font-family: inherit;
  font-size: .96rem;
  line-height: 1.72;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.markdown-body .lesson-upgrade .lesson-observation-experiment > pre code,
.markdown-body .lesson-upgrade .lesson-observation-experiment details pre code {
  font-family: inherit;
  white-space: inherit;
  overflow-wrap: inherit;
  word-break: inherit;
}
.markdown-body .lesson-upgrade .lesson-experiment-steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
  margin: 1rem 0 1.25rem;
  padding: 0;
  list-style: none;
  counter-reset: experiment-step;
}
.markdown-body .lesson-upgrade .lesson-experiment-steps li {
  position: relative;
  min-width: 0;
  margin: 0;
  padding: .9rem 1rem .9rem 3.2rem;
  border: 1px solid var(--lesson-line);
  border-radius: 11px;
  background: var(--surface);
  font-size: .95rem;
  line-height: 1.6;
  counter-increment: experiment-step;
}
.markdown-body .lesson-upgrade .lesson-experiment-steps li::before {
  content: counter(experiment-step, decimal-leading-zero);
  position: absolute;
  top: .9rem;
  left: .9rem;
  display: grid;
  place-items: center;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: .75rem;
  font-weight: 800;
}
.markdown-body .lesson-upgrade .lesson-observation-experiment details {
  margin-top: 1.1rem;
  padding: .75rem 1rem;
  border: 1px solid var(--lesson-line);
  border-radius: 11px;
  background: var(--bg-secondary);
}
.markdown-body .lesson-upgrade .lesson-observation-experiment details summary {
  color: var(--primary);
  font-weight: 700;
  cursor: pointer;
}
.markdown-body .lesson-upgrade .lesson-steps { border-left: 4px solid var(--primary); }
.markdown-body .lesson-upgrade .lesson-steps ol,
.markdown-body .lesson-upgrade .lesson-steps ul,
.markdown-body .lesson-upgrade .lesson-check ul { margin: .7rem 0 0; padding-left: 1.45rem; }
.markdown-body .lesson-upgrade .lesson-steps li,
.markdown-body .lesson-upgrade .lesson-check li { padding-left: .2rem; margin: .5rem 0; }
.markdown-body .lesson-upgrade .lesson-prompt {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--lesson-line);
  border-radius: 15px;
  background: var(--bg-secondary);
}
.markdown-body .lesson-upgrade .lesson-prompt h3,
.markdown-body .lesson-upgrade .lesson-prompt > p { margin: 0; padding: 1rem 1.2rem .3rem; }
.markdown-body .lesson-upgrade .lesson-prompt pre {
  margin: .6rem 0 0;
  padding: 1.1rem 1.25rem;
  overflow: auto;
  border-top: 1px solid var(--lesson-line);
  background: var(--surface);
  color: var(--lesson-ink);
  font: inherit;
  font-size: .94rem;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.markdown-body .lesson-upgrade .lesson-prompt code { font: inherit; white-space: inherit; }
.markdown-body .lesson-upgrade .lesson-output { border-left: 4px solid #23a485; }
.markdown-body .lesson-upgrade .lesson-check { border-left: 4px solid #df884a; }
.markdown-body .lesson-upgrade .lesson-source { color: var(--lesson-muted); font-size: .88rem; background: var(--bg-secondary); }
.markdown-body .lesson-upgrade .lesson-source a { overflow-wrap: anywhere; }
.markdown-body .lesson-rigour {
  padding: clamp(1.2rem, 2.6vw, 1.7rem);
  border: 1px solid var(--lesson-line, var(--border));
  border-radius: 18px;
  background: linear-gradient(150deg, var(--surface), var(--primary-soft));
}
.markdown-body .lesson-rigour h2 { margin-top: 0; }
.markdown-body .lesson-rigour .rigour-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
  margin: 1rem 0;
}
.markdown-body .lesson-rigour .rigour-card {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--lesson-line, var(--border));
  border-radius: 12px;
  background: var(--surface);
}
.markdown-body .lesson-rigour .rigour-card > strong { display: block; margin-bottom: .35rem; }
.markdown-body .lesson-rigour figure { overflow: auto; margin: 1rem 0; }
.markdown-body .lesson-rigour svg { display: block; width: 100%; min-width: 460px; height: auto; }
.markdown-body .lesson-rigour figcaption { color: var(--lesson-muted, var(--text-secondary)); font-size: .88rem; }
.markdown-body .lesson-rigour table { display: block; max-width: 100%; overflow: auto; }
.markdown-body .lesson-rigour details { margin-top: 1rem; padding-top: .7rem; border-top: 1px solid var(--lesson-line, var(--border)); color: var(--lesson-muted, var(--text-secondary)); font-size: .9rem; }
.markdown-body .lesson-rigour summary { cursor: pointer; font-weight: 700; }
.markdown-body .lesson-upgrade .lesson-evidence {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .75rem;
}
.markdown-body .lesson-upgrade .lesson-evidence > * {
  min-width: 0;
  padding: .85rem;
  border: 1px solid var(--lesson-line);
  border-radius: 12px;
  background: var(--bg-secondary);
}
.markdown-body .lesson-upgrade .lesson-evidence b,
.markdown-body .lesson-upgrade .lesson-evidence span { display: block; }
.markdown-body .lesson-upgrade .lesson-evidence span { color: var(--lesson-muted); font-size: .9rem; }
.course-route {
  margin: 1.5rem 0 2.3rem;
  padding: clamp(1.2rem, 2.5vw, 1.7rem);
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
}
.course-route h2 { margin: 0 0 .45rem; font-size: clamp(1.3rem, 2vw, 1.65rem); }
.course-route p { color: var(--text-secondary); margin: .35rem 0 1rem; }
.course-route-present { display: inline-flex; align-items: center; padding: .5rem .85rem; margin: 0 0 1rem; border: 1px solid var(--primary); border-radius: 9px; color: var(--primary); font-weight: 700; text-decoration: none; }
.course-route-present:hover,.course-route-present:focus-visible { background: var(--primary-soft); }
.course-route-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .65rem; }
.course-route-list a { display: flex; flex-direction: column; gap: .3rem; min-width: 0; padding: .85rem; border: 1px solid var(--border); border-radius: 12px; background: var(--bg-secondary); text-decoration: none; color: var(--text); }
.course-route-list a:hover,.course-route-list a:focus-visible { border-color: var(--primary); box-shadow: var(--shadow); }
.course-route-list b { color: var(--primary); font-size: .75rem; letter-spacing: .06em; }
.course-route-list span { font-weight: 700; line-height: 1.4; }
.course-route-list small { color: var(--text-muted); font-size: .78rem; line-height: 1.4; }
@media (max-width: 760px) {
  .markdown-body .lesson-upgrade .lesson-evidence { grid-template-columns: 1fr; }
  .markdown-body .lesson-rigour .rigour-grid { grid-template-columns: 1fr; }
  .markdown-body .lesson-upgrade .lesson-experiment-steps { grid-template-columns: 1fr; }
  .course-route-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 480px) {
  .course-route-list { grid-template-columns: 1fr; }
  .markdown-body .lesson-upgrade .lesson-visual svg { min-width: 360px; }
  .markdown-body .lesson-upgrade .lesson-observation-experiment > pre,
  .markdown-body .lesson-upgrade .lesson-observation-experiment details pre {
    padding: .85rem;
    font-size: .92rem;
    line-height: 1.65;
  }
}
@media print {
  .course-route-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .markdown-body .lesson-upgrade .lesson-visual,
  .markdown-body .lesson-upgrade .lesson-case,
  .markdown-body .lesson-upgrade .lesson-steps,
  .markdown-body .lesson-upgrade .lesson-prompt,
  .markdown-body .lesson-upgrade .lesson-output,
  .markdown-body .lesson-upgrade .lesson-check { break-inside: avoid; box-shadow: none; }
}