:root {
  --ink: #163947;
  --blue: #24566a;
  --mint: #8fd3bb;
  --coral: #ea7468;
  --yellow: #f4ce74;
  --paper: #f4f8f9;
  --muted: #50666e;
  --line: #cfdee3;
  --coral-action: #a53f39;
  --focus-light: #163947;
  --focus-dark: #f4ce74;
  --display: Newsreader, Georgia, serif;
  --body: Manrope, "Segoe UI", sans-serif;
  --utility: "IBM Plex Mono", Consolas, monospace;
  --surface: #ffffff;
  --shadow: 0 0.75rem 2.25rem rgb(22 57 71 / 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: #26383f;
  background: var(--paper);
  font: 16px/1.6 var(--body);
}

button,
input,
textarea,
select { font: inherit; }

button { cursor: pointer; }

a { color: var(--blue); }

:focus-visible {
  outline: 3px solid var(--focus-light);
  outline-offset: 3px;
}

.site-header :focus-visible,
#portal-footer :focus-visible {
  outline-color: var(--focus-dark);
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  padding: 0.55rem 0.8rem;
  color: #fff;
  background: var(--ink);
  border-radius: 0.25rem;
}

.skip-link:focus { top: 1rem; }

.skip-link:focus-visible { outline-color: var(--focus-dark); }

.site-header {
  display: grid;
  grid-template-columns: minmax(12rem, 16rem) minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
  min-height: 5.25rem;
  padding: 0.75rem clamp(1rem, 3vw, 3rem);
  color: #fff;
  background: var(--ink);
}

.brand {
  display: inline-flex;
  flex-direction: column;
  width: fit-content;
  color: #fff;
  font: 700 clamp(1.1rem, 1.6vw, 1.35rem)/1.1 var(--display);
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand span {
  margin-bottom: 0.2rem;
  color: var(--mint);
  font: 600 1rem/1.2 var(--utility);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

#portal-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.25rem;
}

#portal-nav a,
.nav-link {
  padding: 0.4rem 0.62rem;
  color: #fff;
  font-size: 1rem;
  white-space: nowrap;
  text-decoration: none;
  border-radius: 999px;
}

#portal-nav button { border: 0; background: transparent; }

#portal-nav a:hover,
#portal-nav a:focus-visible,
#portal-nav [aria-current="page"],
#portal-nav [aria-current="true"] {
  color: var(--ink);
  background: var(--mint);
}

#system-selector {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0.75rem clamp(1rem, 3vw, 3rem);
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.system-selector-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.system-selector-group-title {
  font: 600 0.82rem/1.2 var(--utility);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.system-selector-group-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.system-selector-button {
  flex: 1 1 auto;
  max-width: 22rem;
  min-width: 0;
  min-height: 2.65rem;
  padding: 0.45rem 1.1rem;
  color: var(--blue);
  font-weight: 700;
  background: transparent;
  border: 1px solid var(--blue);
  border-radius: 999px;
  text-align: center;
  transition: all 0.2s ease;
}

.system-selector-button:hover {
  color: var(--ink);
  background: #e8f2f2;
}

.system-selector-button[aria-pressed="true"] {
  color: var(--ink);
  background: var(--mint);
  border-color: var(--ink);
}

#patient-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  min-height: 2.75rem;
  padding: 0.5rem clamp(1rem, 3vw, 3rem);
  color: var(--ink);
  background: #e8f2f2;
  border-bottom: 1px solid var(--line);
}

.patient-problem { flex: 1 1 24rem; }

.lesson-time {
  color: var(--muted);
  font: 600 1rem/1.35 var(--utility);
}

.patient-context,
.lesson-meta,
.utility-label {
  font: 600 1rem/1.35 var(--utility);
  letter-spacing: 0.01em;
}

.patient-context { font-size: 1rem; }

.patient-context strong { color: var(--blue); }

.workspace {
  display: grid;
  grid-template-columns: minmax(12rem, 16rem) minmax(0, 1fr) minmax(15rem, 19rem);
  min-height: calc(100vh - 8rem);
}

#stage-nav,
#quick-reference {
  padding: clamp(1rem, 2.5vw, 2rem);
  background: rgb(255 255 255 / 0.48);
}

#stage-nav { border-right: 1px solid var(--line); }

#quick-reference { border-left: 1px solid var(--line); }

.stage-heading,
.reference-heading {
  margin: 0 0 1rem;
  color: var(--muted);
  font: 700 1rem/1.3 var(--utility);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.stage-list {
  position: relative;
  display: grid;
  gap: 0.3rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.stage-list::before {
  position: absolute;
  top: 1.35rem;
  bottom: 1.35rem;
  left: 1.06rem;
  width: 2px;
  content: "";
  background: var(--line);
}

.stage-link {
  position: relative;
  display: grid;
  grid-template-columns: 2.15rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: center;
  width: 100%;
  padding: 0.55rem 0.45rem;
  color: var(--ink);
  font-weight: 700;
  text-align: left;
  background: transparent;
  border: 0;
  border-radius: 0.3rem;
}

.stage-link:hover { background: #e4eff0; }

.stage-link:disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.stage-link[aria-current="step"],
.stage-link[aria-current="true"] { color: var(--blue); }

.stage-number {
  z-index: 1;
  display: grid;
  place-items: center;
  width: 2.15rem;
  aspect-ratio: 1;
  color: var(--muted);
  font: 700 1rem/1 var(--utility);
  background: var(--paper);
  border: 2px solid var(--line);
  border-radius: 50%;
}

.stage-link[data-visited="true"] .stage-number {
  color: var(--ink);
  background: var(--mint);
  border-color: var(--mint);
}

.progress-copy {
  margin: -0.65rem 0 1rem;
  color: var(--muted);
  font: 600 1rem/1.35 var(--utility);
}

.stage-link[aria-current="step"] .stage-number,
.stage-link[aria-current="true"] .stage-number {
  color: #fff;
  background: var(--blue);
  border-color: var(--blue);
  box-shadow: 0 0 0 0.28rem rgb(143 211 187 / 0.55);
}

.stage-copy small {
  display: block;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 500;
}

.pulse-trace {
  display: block;
  width: 100%;
  height: 2.25rem;
  margin: 0.85rem 0 1.25rem;
  overflow: visible;
}

.pulse-trace path {
  fill: none;
  stroke: var(--blue);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

.pulse-trace .pulse-progress {
  stroke: var(--mint);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 100;
  transition: stroke-dashoffset 320ms ease-out;
}

#lesson {
  width: min(100%, 54rem);
  padding: clamp(1.25rem, 4vw, 4rem);
  margin: 0 auto;
}

.lesson-header { margin-bottom: 2rem; }

.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--blue);
  font: 700 1rem/1.35 var(--utility);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.lesson-title,
.lesson-card h2,
.lesson-card h3,
.correlation-card h2,
.summary-card h2,
.summary-card h3,
.application-section > h2,
.differential-item h3,
.differential-item h4,
.osce-card h2,
.osce-card h3,
.reference-card h3,
dialog h2 {
  color: var(--ink);
  font-family: var(--display);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.lesson-title {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(2rem, 4.2vw, 3.35rem);
}

.lesson-objective {
  max-width: 65ch;
  margin: 1rem 0 0;
  color: var(--muted);
}

.lesson-card,
.reference-card,
.feedback,
.osce-card,
.summary-card {
  margin: 1rem 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  box-shadow: var(--shadow);
}

.lesson-card,
.osce-card,
.summary-card { padding: clamp(1rem, 2vw, 1.55rem); }

.lesson-card > :first-child,
.reference-card > :first-child,
.feedback > :first-child { margin-top: 0; }

.lesson-card > :last-child,
.reference-card > :last-child,
.feedback > :last-child { margin-bottom: 0; }

.content-notice {
  padding: 0.9rem 1rem;
  color: var(--ink);
  font-weight: 700;
  background: #fff7de;
  border: 1px solid #d4a83e;
  border-left-width: 0.4rem;
  border-radius: 0.35rem;
}

.teaching-note {
  border-left: 0.35rem solid var(--yellow);
  background: #fff9e9;
}

.attention-note {
  border-left: 0.35rem solid var(--coral);
  background: #fff2f0;
}

.case-disclosure {
  border-left: 0.35rem solid var(--mint);
  background: #edf8f5;
}

.case-disclosure-boundary {
  padding-top: 0.85rem;
  color: var(--muted);
  font-weight: 700;
  border-top: 1px solid var(--line);
}

.level-panel[hidden],
[data-view][hidden] { display: none; }

.foundation-layer { border-left: 0.35rem solid var(--yellow); }

.senior-layer {
  margin: 1rem 0;
  background: #eef5f7;
  border: 1px solid var(--line);
  border-left: 0.35rem solid var(--blue);
  border-radius: 0.55rem;
  box-shadow: var(--shadow);
}

.senior-layer-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  min-height: 3rem;
  padding: 0.75rem 1rem;
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 700;
  text-align: left;
  background: transparent;
  border: 0;
}

.senior-layer-toggle::after {
  content: "+";
  font: 700 1.4rem/1 var(--utility);
}

.senior-layer-toggle[aria-expanded="true"]::after { content: "−"; }

.senior-layer-content { padding: 0 clamp(1rem, 2vw, 1.55rem) clamp(1rem, 2vw, 1.55rem); }

.senior-layer-content[hidden] { display: none; }

.senior-assessment {
  padding-top: 0.8rem;
  margin-top: 1rem;
  border-top: 1px solid var(--line);
}

.question { margin: 1.5rem 0; }

.question legend,
.question-title {
  margin-bottom: 0.8rem;
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.25;
}

.question-options { display: grid; gap: 0.65rem; }

.question-option {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  padding: 0.78rem 0.85rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
}

.question-option:hover { border-color: var(--blue); }

.question-option:has(input:checked) {
  background: #e9f5f1;
  border-color: var(--blue);
}

.question-option input { margin-top: 0.36rem; accent-color: var(--blue); }

.feedback { padding: 1rem; border-left: 0.35rem solid var(--mint); }

.feedback[data-status="attention"],
.feedback[data-status="incorrect"] { border-left-color: var(--coral); }

.feedback[data-status="teaching"] { border-left-color: var(--yellow); }

.feedback-label {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--ink);
  font: 700 1rem/1.3 var(--utility);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.source-details {
  padding-top: 0.8rem;
  margin-top: 1rem;
  border-top: 1px solid var(--line);
}

.source-details summary,
.osce-disclosure summary {
  color: var(--blue);
  font-weight: 700;
  cursor: pointer;
}

.source-list {
  padding-left: 1.25rem;
  margin: 0.65rem 0 0;
}

.source-list .citation {
  margin-top: 0.45rem;
}

.application-section {
  margin: 2rem 0;
}

.application-section > h2 {
  padding-bottom: 0.65rem;
  margin: 0 0 1rem;
  font-size: clamp(1.65rem, 3vw, 2.2rem);
  border-bottom: 0.2rem solid var(--mint);
}

.application-practice > h2 {
  border-bottom-color: var(--yellow);
}

.sentence-scaffold,
.ranking-exercise,
.senior-application-practice {
  padding: 0.85rem 1rem;
  border-radius: 0.4rem;
}

.sentence-scaffold {
  color: var(--ink);
  font-weight: 700;
  background: #fff9e9;
  border-left: 0.35rem solid var(--yellow);
}

.ranking-exercise {
  background: #eef5f7;
  border-left: 0.35rem solid var(--blue);
}

.senior-application-practice {
  margin: 1rem 0;
  background: #fff;
  border: 1px solid var(--line);
}

.new-finding-label {
  margin-bottom: 0.25rem;
  color: var(--blue);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.new-finding-label + p {
  margin-top: 0;
}

.re-ranking-prompt {
  font-weight: 700;
}

.model-differential {
  padding: clamp(1rem, 2vw, 1.55rem);
  margin: 1rem 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 0.35rem solid var(--mint);
  border-radius: 0.55rem;
  box-shadow: var(--shadow);
}

.model-differential > summary {
  color: var(--blue);
  font: 700 1.2rem/1.3 var(--utility);
  cursor: pointer;
}

.provisional-statement {
  padding: 0.85rem 1rem;
  color: var(--ink);
  background: #fff7de;
  border-left: 0.35rem solid var(--yellow);
}

.differential-list {
  display: grid;
  gap: 1rem;
  padding-left: 1.75rem;
}

.differential-item {
  padding: 1rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
}

.diagnosis-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: space-between;
  align-items: flex-start;
}

.diagnosis-heading h3 {
  margin: 0;
  font-size: 1.35rem;
}

.differential-item h4 {
  margin: 1rem 0 0.35rem;
  font-size: 1.05rem;
}

.differential-item ul {
  margin: 0;
}

.must-not-miss {
  flex: 0 0 auto;
  padding: 0.25rem 0.5rem;
  color: #fff;
  font: 700 0.82rem/1.3 var(--utility);
  background: #8a2f2b;
  border-radius: 999px;
}

.presentation-prompt {
  max-width: 70ch;
}

.osce-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: flex-start;
}

.osce-heading > div { min-width: 0; }

.osce-heading h2 { margin: 0; }

.osce-time {
  flex: 0 0 auto;
  padding: 0.3rem 0.55rem;
  color: var(--ink);
  font: 700 1rem/1.3 var(--utility);
  background: var(--yellow);
  border-radius: 999px;
}

.station-prompt { max-width: 70ch; }

.osce-checklist {
  display: grid;
  gap: 0.55rem;
  padding: 1rem;
  margin: 1.25rem 0;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
}

.osce-checklist legend {
  padding: 0 0.35rem;
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 700;
}

.osce-check-item {
  display: grid;
  grid-template-columns: 1.25rem minmax(0, 1fr);
  gap: 0.65rem;
  align-items: start;
}

.osce-check-item input {
  width: 1.1rem;
  height: 1.1rem;
  margin: 0.25rem 0 0;
  accent-color: var(--blue);
}

.osce-disclosure {
  padding: 0.8rem 0;
  border-top: 1px solid var(--line);
}

.osce-disclosure > :last-child { margin-bottom: 0; }

.lesson-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 2rem;
}

.lesson-actions .reset-action { margin-left: auto; }

.button,
.lesson-actions button,
.lesson-actions a,
.reference-back-link {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 2.7rem;
  padding: 0.5rem 0.95rem;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  background: var(--blue);
  border: 1px solid var(--blue);
  border-radius: 0.3rem;
}

.button:hover,
.lesson-actions button:hover,
.lesson-actions a:hover { background: var(--ink); }

.button-secondary,
.lesson-actions .secondary {
  color: var(--blue);
  background: transparent;
  border-color: var(--blue);
}

#quick-reference > .quick-reference-disclosure { margin: 0; }

#quick-reference > .quick-reference-disclosure > summary {
  display: none;
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
}

.reference-toggle[aria-expanded] {
  display: none;
  width: 100%;
  padding: 0;
  color: var(--ink);
  font-weight: 700;
  text-align: left;
  background: transparent;
  border: 0;
}

.reference-toggle[aria-expanded="true"] { color: var(--blue); }

.reference-library-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 1rem;
}

.reference-library-link,
.footer-reset {
  min-height: 2.35rem;
  padding: 0.4rem 0.65rem;
  color: var(--blue);
  font-weight: 700;
  background: transparent;
  border: 1px solid var(--blue);
  border-radius: 0.3rem;
}

.reference-library-link:hover,
.footer-reset:hover { color: #fff; background: var(--blue); }

.reference-content[hidden] { display: none; }

@media (min-width: 901px) {
  #quick-reference .reference-content[hidden] { display: block; }
}

.attention-note {
  padding: 0.85rem;
  margin: 1rem 0;
  border-left: 0.35rem solid var(--coral);
  background: #fff2f0;
}

.reference-card { padding: 1rem; box-shadow: none; }

.reference-card h3 { margin-bottom: 0.4rem; font-size: 1.3rem; }

.correlation-card h2 { margin-top: 0; font-size: clamp(1.5rem, 3vw, 2rem); }

.correlation-card h3 { margin-top: 1.25rem; }

.correlation-safety p { margin: 0.35rem 0 0; }

.technique-explanation { max-width: 72ch; }

.reference-card ul,
.lesson-card ul,
.lesson-card ol { padding-left: 1.25rem; }

.reference-card li + li { margin-top: 0.5rem; }

.citation {
  display: block;
  margin-top: 0.9rem;
  color: var(--muted);
  font: 1rem/1.45 var(--utility);
}

.citation button {
  padding: 0;
  color: inherit;
  text-align: left;
  background: none;
  border: 0;
  border-bottom: 1px dotted currentColor;
}

#portal-footer {
  padding: 1.25rem clamp(1rem, 3vw, 3rem);
  color: #dce9ed;
  font-size: 1rem;
  background: var(--ink);
}

#portal-footer p { margin: 0 0 0.75rem; }

#portal-footer .portal-sources {
  max-width: 70rem;
  padding: 0.75rem 0;
  margin: 0.75rem 0;
  border-color: rgb(255 255 255 / 0.35);
}

#portal-footer .portal-sources summary {
  color: #fff;
}

#portal-footer .portal-sources .citation {
  color: #dce9ed;
}

.footer-reset { color: #fff; border-color: #fff; }

.footer-reset:hover { color: var(--ink); background: var(--mint); border-color: var(--mint); }

dialog {
  width: min(calc(100% - 2rem), 34rem);
  padding: 0;
  color: #26383f;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  box-shadow: 0 1.25rem 4rem rgb(22 57 71 / 0.28);
}

dialog::backdrop { background: rgb(22 57 71 / 0.6); }

dialog form { padding: clamp(1.25rem, 3vw, 2rem); }

dialog h2 { margin-bottom: 0.5rem; font-size: 1.7rem; }

dialog form > div,
dialog form > menu {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem;
  padding: 0;
  margin: 1.4rem 0 0;
}

dialog button {
  min-height: 2.6rem;
  padding: 0.45rem 0.8rem;
  color: var(--blue);
  font-weight: 700;
  background: #fff;
  border: 1px solid var(--blue);
  border-radius: 0.3rem;
}

dialog button[value="confirm"] {
  color: #fff;
  background: var(--coral-action);
  border-color: var(--coral-action);
}

dialog button[value="confirm"]:focus-visible { outline-color: var(--focus-dark); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.noscript-lesson {
  max-width: 52rem;
  padding: 2rem;
  margin: 2rem auto;
  background: #fff;
  border: 1px solid var(--line);
}

.noscript-case-context {
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--mint);
}

.noscript-case-context p { margin: 0.35rem 0; }

.noscript-system {
  padding: 1.5rem 0 0;
  margin-top: 1.5rem;
}

.noscript-system + .noscript-system {
  border-top: 0.3rem solid var(--mint);
}

.noscript-system > h2,
.noscript-stage h3 {
  color: var(--ink);
  font-family: var(--display);
  line-height: 1.2;
}

.noscript-stage {
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.noscript-stage h3 { margin-bottom: 0.5rem; }

.noscript-sources {
  color: var(--muted);
  font: 1rem/1.5 var(--utility);
}

.noscript-disclaimer {
  padding: 0.8rem;
  color: var(--ink);
  background: #fff7de;
  border-left: 0.35rem solid #d4a83e;
}

@media (max-width: 1050px) {
  .site-header { grid-template-columns: minmax(12rem, 1fr); }
  #portal-nav { grid-column: 1 / -1; grid-row: 2; justify-content: flex-start; }
}

@media (max-width: 900px) {
  .workspace { display: block; }
  #stage-nav { padding: 0.75rem 1rem; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  #quick-reference { border-top: 1px solid var(--line); }
  .stage-heading { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); }
  .stage-list { display: flex; width: max-content; gap: 0.4rem; }
  .stage-list::before { display: none; }
  .stage-link { grid-template-columns: auto; width: auto; min-width: 5.35rem; padding: 0.35rem 0.45rem; text-align: center; }
  .stage-number { margin: 0 auto; }
  .stage-copy .stage-status {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }
  .pulse-trace { display: none; }
  .progress-copy { margin: 0 0 0.6rem; text-align: center; }
  #quick-reference > :not(details) { display: none; }
  #quick-reference > .quick-reference-disclosure { display: block; }
  #quick-reference > .quick-reference-disclosure > summary { display: flex; align-items: center; justify-content: space-between; }
  #quick-reference > .quick-reference-disclosure > summary::after { content: "+"; font: 1.5rem/1 var(--utility); }
  #quick-reference > .quick-reference-disclosure[open] > summary::after { content: "−"; }
  #quick-reference .reference-toggle[aria-expanded] { display: flex; align-items: center; justify-content: space-between; }
  #quick-reference .reference-toggle[aria-expanded="false"] + .reference-content { display: none; }
  #quick-reference .reference-toggle[aria-expanded="true"] + .reference-content { display: block; }
}

@media (max-width: 620px) {
  .site-header { display: flex; flex-wrap: wrap; }
  .brand { flex: 1; }
  #portal-nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    order: 3;
    width: 100%;
    overflow: visible;
    padding-bottom: 0.1rem;
  }
  .nav-link { width: 100%; }
  #patient-bar { align-items: flex-start; flex-direction: column; gap: 0.2rem; }
  .patient-problem { flex: 0 1 auto; }
  #lesson { padding: 1.25rem 1rem 2rem; }
  .lesson-actions > * { flex: 1 1 100%; }
}

@media (max-width: 360px) {
  #portal-nav { gap: 0.1rem; }
  .nav-link { padding-inline: 0.35rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }

  .pulse-progress { transition: none !important; }
}

/* Technique Explanation List & Item Styling */
.technique-explanation-list {
  list-style: none;
  padding-left: 0 !important;
  margin: 1.25rem 0;
  display: grid;
  gap: 0.85rem;
}

.technique-item {
  position: relative;
  padding: 0.85rem 1rem 0.85rem 2rem;
  border-radius: 0.4rem;
  border-left: 0.35rem solid var(--line);
  background: #fbfcfd;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.technique-item::before {
  content: "•";
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
  font-size: 1.6rem;
  line-height: 1;
}

.technique-item-position {
  border-left-color: #2b6cb0;
  background: #ebf8ff;
}
.technique-item-position::before,
.technique-item-position .technique-label {
  color: #2b6cb0;
}

.technique-item-landmarks {
  border-left-color: #319795;
  background: #e6fffa;
}
.technique-item-landmarks::before,
.technique-item-landmarks .technique-label {
  color: #319795;
}

.technique-item-instructions {
  border-left-color: #805ad5;
  background: #faf5ff;
}
.technique-item-instructions::before,
.technique-item-instructions .technique-label {
  color: #805ad5;
}

.technique-item-normal {
  border-left-color: #38a169;
  background: #f0fff4;
}
.technique-item-normal::before,
.technique-item-normal .technique-label {
  color: #38a169;
}

.technique-item-errors {
  border-left-color: #dd6b20;
  background: #fffaf0;
}
.technique-item-errors::before,
.technique-item-errors .technique-label {
  color: #dd6b20;
}

.technique-item-limits {
  border-left-color: #d69e2e;
  background: #fffdf0;
}
.technique-item-limits::before,
.technique-item-limits .technique-label {
  color: #b7791f;
}

.technique-item-adaptations {
  border-left-color: #4c51bf;
  background: #ebf4ff;
}
.technique-item-adaptations::before,
.technique-item-adaptations .technique-label {
  color: #4c51bf;
}

.technique-label {
  font-weight: 700;
  display: inline-block;
  margin-right: 0.25rem;
}

.technique-text {
  color: var(--ink);
}

/* Lesson Card Section Styling */
.common-core-card {
  border-left: 0.35rem solid var(--blue);
  background: #f4f8f9;
}

.case-disclosure {
  border-left: 0.35rem solid var(--yellow);
  background: #fffdf5;
}

.foundation-layer {
  border-left: 0.35rem solid var(--mint);
  background: #f6fcf9;
}

.senior-layer-content {
  border-left: 0.35rem solid #805ad5;
  background: #faf8ff;
  padding: 1.25rem;
  border-radius: 0.45rem;
  margin-top: 0.55rem;
}

.assessment-card {
  border-left: 0.35rem solid #4c51bf;
  background: #f8faff;
}

.osce-card {
  border-left: 0.35rem solid var(--coral);
  background: #fffaf9;
}

@media print {
  body { color: #000; background: #fff; }
  .skip-link,
  .site-header,
  #system-selector,
  #patient-bar,
  #stage-nav,
  #quick-reference,
  #portal-footer,
  .lesson-actions,
  dialog { display: none !important; }
  .workspace { display: block; min-height: 0; }
  #lesson { width: auto; max-width: none; padding: 0; }
  #stage-nav,
  #quick-reference,
  #portal-footer,
  .lesson-actions,
  dialog { display: none !important; }
  .workspace { display: block; min-height: 0; }
  #lesson { width: auto; max-width: none; padding: 0; }
  .lesson-card,
  .reference-card,
  .feedback,
  .osce-card,
  .summary-card { break-inside: avoid; box-shadow: none; }
  a { color: #000; text-decoration: none; }
}

.noscript-lesson,
.noscript-system {
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}