/* Pi Leo Quantum Learning
   Feature-scoped, dependency-free and designed for ordinary school devices. */

.quantum-page {
  --q-ink: #102a43;
  --q-muted: #52657a;
  --q-blue: #2864dc;
  --q-blue-dark: #17449d;
  --q-teal: #0c9278;
  --q-teal-dark: #076956;
  --q-violet: #6856cf;
  --q-violet-dark: #4939a2;
  --q-gold: #f3b61f;
  --q-coral: #d94f48;
  --q-soft: #eef4fb;
  --q-surface: #fff;
  --q-border: rgba(16, 42, 67, 0.14);
  --q-shadow: 0 18px 48px rgba(16, 42, 67, 0.12);
  --q-accent: var(--q-blue);
  --q-accent-dark: var(--q-blue-dark);
  background: #f8fafd;
  color: var(--q-ink);
}

.quantum-page.quantum-teal {
  --q-accent: var(--q-teal);
  --q-accent-dark: var(--q-teal-dark);
}

.quantum-page.quantum-violet {
  --q-accent: var(--q-violet);
  --q-accent-dark: var(--q-violet-dark);
}

.quantum-page.quantum-navy {
  --q-accent: #214a7a;
  --q-accent-dark: #102a43;
}

.quantum-page .btn {
  min-height: 48px;
}

.quantum-page .btn-primary {
  background: var(--q-accent);
}

.quantum-page .btn-primary:hover {
  background: var(--q-accent-dark);
}

.quantum-page :where(button, a, input, select, summary):focus-visible {
  outline: 3px solid var(--q-gold);
  outline-offset: 3px;
  box-shadow: none;
}

.q-kicker {
  margin: 0 0 0.55rem;
  color: var(--q-accent, #2864dc);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.q-section {
  padding: clamp(4rem, 8vw, 6.5rem) 0;
}

.q-section--soft {
  background: var(--q-soft);
  border-block: 1px solid var(--q-border);
}

.q-section--ink {
  --q-accent: #98f1dc;
  background:
    radial-gradient(circle at 12% 12%, rgba(121, 104, 232, 0.28), transparent 24rem),
    linear-gradient(135deg, #0d2744, #173f6a);
  color: #fff;
}

.q-section--ink :where(h2, h3, p) {
  color: inherit;
}

.q-section-heading {
  max-width: 760px;
  margin-bottom: 2.5rem;
}

.q-section-heading > p:last-child {
  max-width: 680px;
  color: var(--q-muted);
  font-size: 1.05rem;
}

.q-section--ink .q-section-heading > p:last-child {
  color: #d9e7f6;
}

.q-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(4.5rem, 9vw, 8rem) 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(121, 104, 232, 0.28), transparent 25rem),
    radial-gradient(circle at 8% 94%, rgba(12, 146, 120, 0.22), transparent 22rem),
    linear-gradient(140deg, #edf4ff, #f7f3ff 54%, #edfbf7);
}

.q-hero::before,
.q-hero::after {
  position: absolute;
  width: 16rem;
  height: 16rem;
  border: 1px solid rgba(40, 100, 220, 0.12);
  border-radius: 50%;
  content: "";
}

.q-hero::before {
  top: -8rem;
  left: 20%;
}

.q-hero::after {
  right: -7rem;
  bottom: -9rem;
  width: 22rem;
  height: 22rem;
}

.q-hero-grid,
.q-pathway-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(330px, 0.85fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}

.q-hero h1,
.q-pathway-hero h1,
.q-lesson-hero h1,
.q-guide-hero h1 {
  max-width: 18ch;
  margin-bottom: 1.3rem;
}

.q-hero-lead {
  max-width: 720px;
  color: var(--q-muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.q-hero-actions,
.q-card-actions,
.q-support-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 1.7rem;
}

.q-trust-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.2rem;
  padding: 0;
  margin: 1.7rem 0 0;
  color: #38516b;
  font-size: 0.92rem;
  font-weight: 700;
  list-style: none;
}

.q-trust-list li::before {
  margin-right: 0.45rem;
  color: var(--q-teal);
  content: "✓";
}

.q-hero-model {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0.6rem;
  align-items: center;
  min-height: 340px;
  padding: clamp(1.4rem, 4vw, 2.3rem);
  border: 1px solid rgba(40, 100, 220, 0.14);
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--q-shadow);
  backdrop-filter: blur(10px);
}

.q-hero-model > p {
  grid-column: 1 / -1;
  align-self: end;
  padding-top: 1rem;
  margin: 0;
  border-top: 1px solid var(--q-border);
  color: var(--q-muted);
  font-size: 0.88rem;
}

.q-hero-atom,
.q-model-orbit {
  position: relative;
  width: 88px;
  height: 88px;
  margin: auto;
  border: 2px solid rgba(40, 100, 220, 0.46);
  border-radius: 50%;
}

.q-hero-atom::before,
.q-hero-atom::after,
.q-model-orbit::before,
.q-model-orbit::after {
  position: absolute;
  inset: 14px -5px;
  border: 2px solid rgba(104, 86, 207, 0.45);
  border-radius: 50%;
  content: "";
  transform: rotate(58deg);
}

.q-hero-atom::after,
.q-model-orbit::after {
  transform: rotate(-58deg);
}

.q-hero-atom span,
.q-model-orbit span {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--q-coral);
  transform: translate(-50%, -50%);
}

.q-hero-atom i,
.q-model-orbit i,
.q-hero-atom b,
.q-model-orbit b {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--q-blue);
}

.q-hero-atom i,
.q-model-orbit i {
  top: 7px;
  left: 13px;
}

.q-hero-atom b,
.q-model-orbit b {
  right: 9px;
  bottom: 14px;
}

.q-hero-qubit,
.q-hero-result {
  display: grid;
  place-items: center;
  min-height: 104px;
  padding: 0.8rem;
  border: 2px solid rgba(16, 42, 67, 0.12);
  border-radius: 50%;
  background: #fff;
  text-align: center;
}

.q-hero-qubit span,
.q-hero-result strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.q-hero-qubit small,
.q-hero-result small {
  color: var(--q-muted);
}

.q-hero-flow {
  color: var(--q-blue);
  font-size: 1.5rem;
  font-weight: 800;
}

.q-intro-grid,
.q-support-grid,
.q-accuracy-wide {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(310px, 0.9fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.q-intro-grid > div > p:not(.q-kicker),
.q-support-grid > div > p:not(.q-kicker) {
  color: var(--q-muted);
  font-size: 1.05rem;
}

.q-accuracy-card {
  display: flex;
  gap: 1rem;
  padding: 1.7rem;
  border: 1px solid rgba(12, 146, 120, 0.28);
  border-radius: 20px;
  background: #effbf7;
}

.q-accuracy-card > span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--q-teal);
  color: #fff;
  font-weight: 900;
}

.q-accuracy-card p {
  margin: 0;
  color: #365a53;
}

.q-pathway-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.3rem;
}

.q-pathway-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: clamp(1.4rem, 3vw, 2rem);
  overflow: hidden;
  border: 1px solid var(--q-border);
  border-radius: 24px;
  background: #fff;
  box-shadow: 0 8px 30px rgba(16, 42, 67, 0.08);
}

.q-pathway-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 6px;
  background: var(--card-accent, var(--q-blue));
  content: "";
}

.q-pathway-card--teal {
  --card-accent: var(--q-teal);
}

.q-pathway-card--violet {
  --card-accent: var(--q-violet);
}

.q-pathway-card--navy {
  --card-accent: #214a7a;
}

.q-pathway-card .q-kicker {
  color: var(--card-accent);
}

.q-pathway-card > p:not(.q-kicker) {
  color: var(--q-muted);
}

.q-pathway-symbol {
  display: grid;
  place-items: center;
  width: 58px;
  min-width: 58px;
  height: 58px;
  margin-bottom: 1.1rem;
  border-radius: 18px;
  background: color-mix(in srgb, var(--card-accent, var(--q-accent)) 12%, white);
  color: var(--card-accent, var(--q-accent));
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
}

.q-card-facts,
.q-pathway-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1rem 0 0;
}

.q-card-facts div,
.q-pathway-facts div {
  padding: 0.8rem;
  border-radius: 12px;
  background: #f3f7fb;
}

.q-card-facts dt,
.q-pathway-facts dt {
  color: var(--q-muted);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.q-card-facts dd,
.q-pathway-facts dd {
  margin: 0.15rem 0 0;
  color: var(--q-ink);
  font-size: 0.9rem;
  font-weight: 800;
}

.q-progress-block {
  margin-top: 1.3rem;
}

.q-progress-block > div:first-child {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.4rem;
  color: var(--q-muted);
  font-size: 0.86rem;
}

.q-progress-track {
  width: 100%;
  height: 11px;
  overflow: hidden;
  border-radius: 999px;
  background: #dfe8f2;
}

.q-progress-track > span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--card-accent, var(--q-accent));
}

.q-card-actions {
  align-items: stretch;
  margin-top: auto;
  padding-top: 1.4rem;
}

.q-card-actions .btn {
  flex: 1 1 auto;
  padding-inline: 1rem;
}

.q-overview-timeline {
  display: grid;
  grid-template-columns: repeat(12, minmax(62px, 1fr));
  gap: 0.6rem;
  padding: 0;
  margin: 0;
  overflow-x: auto;
  list-style: none;
  scrollbar-color: var(--q-blue) #dfe8f2;
}

.q-overview-timeline li {
  position: relative;
  min-width: 68px;
  text-align: center;
}

.q-overview-timeline li:not(:last-child)::after {
  position: absolute;
  top: 22px;
  right: -0.6rem;
  width: 0.6rem;
  height: 2px;
  background: #bfccda;
  content: "";
}

.q-overview-timeline span {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin: 0 auto 0.55rem;
  border-radius: 50%;
  background: var(--q-blue);
  color: #fff;
  font-weight: 900;
}

.q-overview-timeline strong {
  color: var(--q-muted);
  font-size: 0.73rem;
  white-space: nowrap;
}

.q-how-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.q-how-grid article {
  padding: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.07);
}

.q-how-grid article > span {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
  border-radius: 12px;
  background: var(--q-gold);
  color: #102a43;
  font-weight: 900;
}

.q-how-grid p {
  margin: 0;
  color: #d9e7f6;
}

.q-support-checklist {
  padding: 1.8rem;
  border: 1px solid var(--q-border);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 8px 30px rgba(16, 42, 67, 0.07);
}

.q-support-checklist ul,
.q-check-list {
  display: grid;
  gap: 0.75rem;
  padding: 0;
  list-style: none;
}

.q-support-checklist li,
.q-check-list li {
  position: relative;
  padding-left: 1.6rem;
}

.q-support-checklist li::before,
.q-check-list li::before {
  position: absolute;
  left: 0;
  color: var(--q-teal);
  font-weight: 900;
  content: "✓";
}

.q-support-links {
  display: grid;
}

.q-support-links a {
  display: flex;
  justify-content: space-between;
  min-height: 48px;
  padding: 0.8rem 1rem;
  border: 1px solid var(--q-border);
  border-radius: 12px;
  background: #fff;
  color: var(--q-blue);
  font-weight: 800;
}

.q-search {
  max-width: 820px;
  padding: 1.5rem;
  border: 1px solid var(--q-border);
  border-radius: 18px;
  background: #fff;
}

.q-search label {
  display: block;
  margin-bottom: 0.45rem;
  font-weight: 800;
}

.q-search > div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.7rem;
}

.q-search-results {
  max-width: 820px;
  margin-top: 1.4rem;
}

.q-search-results ul {
  display: grid;
  gap: 0.7rem;
  padding: 0;
  list-style: none;
}

.q-search-results a {
  display: grid;
  gap: 0.15rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--q-border);
  border-radius: 14px;
  background: #fff;
}

.q-search-results a:hover {
  border-color: var(--q-blue);
}

.q-search-results span,
.q-search-results small {
  color: var(--q-muted);
}

/* Pathway overview */

.q-pathway-hero,
.q-guide-hero,
.q-lesson-hero {
  padding: clamp(3.5rem, 7vw, 6rem) 0;
  background:
    radial-gradient(circle at 86% 10%, color-mix(in srgb, var(--q-accent) 20%, transparent), transparent 24rem),
    linear-gradient(140deg, #f0f5fb, #fbfcfe);
  border-bottom: 1px solid var(--q-border);
}

.q-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-items: center;
  margin-bottom: 2rem;
  color: var(--q-muted);
  font-size: 0.86rem;
}

.q-breadcrumbs a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--q-accent);
  font-weight: 800;
}

.q-pathway-facts {
  max-width: 720px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.q-pathway-progress {
  display: grid;
  justify-items: center;
  padding: 2rem;
  border: 1px solid var(--q-border);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--q-shadow);
  text-align: center;
}

.q-pathway-progress .q-pathway-symbol {
  --card-accent: var(--q-accent);
}

.q-progress-ring {
  display: grid;
  place-content: center;
  width: 148px;
  height: 148px;
  margin: 1rem 0;
  border-radius: 50%;
  background:
    radial-gradient(circle, white 61%, transparent 63%),
    conic-gradient(var(--q-accent) var(--progress), #dfe8f2 0);
}

.q-progress-ring strong {
  color: var(--q-ink);
  font-size: 1.65rem;
}

.q-progress-ring span {
  color: var(--q-muted);
  font-size: 0.8rem;
}

.q-pathway-progress small {
  color: var(--q-muted);
}

.q-week-timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  padding: 0;
  list-style: none;
}

.q-week-timeline a {
  display: flex;
  gap: 0.9rem;
  align-items: center;
  min-height: 104px;
  padding: 1rem;
  border: 1px solid var(--q-border);
  border-radius: 17px;
  background: #fff;
  box-shadow: 0 5px 18px rgba(16, 42, 67, 0.05);
}

.q-week-timeline a:hover,
.q-week-timeline a[aria-current="step"] {
  border-color: var(--q-accent);
  transform: translateY(-1px);
}

.q-week-number {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: color-mix(in srgb, var(--q-accent) 12%, white);
  color: var(--q-accent);
  font-weight: 900;
}

.q-week-timeline .is-complete .q-week-number {
  background: var(--q-teal);
  color: #fff;
}

.q-week-timeline a > span:last-child {
  display: grid;
  gap: 0.12rem;
}

.q-week-timeline small,
.q-week-timeline em {
  color: var(--q-muted);
  font-size: 0.75rem;
  font-style: normal;
}

.q-level-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.95fr 0.95fr;
  gap: 1.2rem;
  align-items: stretch;
}

.q-level-grid article {
  padding: 1.6rem;
  border: 1px solid var(--q-border);
  border-radius: 18px;
  background: #fff;
}

.q-level-grid article > span {
  color: var(--q-accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.q-accuracy-wide {
  align-items: center;
}

.q-accuracy-wide p {
  margin: 0;
  color: #d9e7f6;
  font-size: 1.05rem;
}

/* Lesson shell */

.q-lesson-hero {
  padding-bottom: 4rem;
}

.q-lesson-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(290px, 0.7fr);
  gap: 2rem;
  align-items: end;
}

.q-lesson-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.q-lesson-meta span,
.q-model-label {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--q-border);
  border-radius: 999px;
  background: #fff;
  color: var(--q-muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.q-essential-question {
  padding: 1.6rem;
  border-left: 5px solid var(--q-gold);
  border-radius: 0 18px 18px 0;
  background: #fff9e8;
}

.q-essential-question span {
  color: #755500;
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.q-essential-question p {
  margin: 0.35rem 0 0;
  color: #463500;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
}

.q-lesson-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.q-lesson-main {
  display: grid;
  min-width: 0;
  gap: 1.4rem;
}

.q-lesson-card,
.q-explanation,
.q-quiz,
.q-sources,
.q-recap,
.q-story,
.q-analogy,
.q-misconception,
.q-extension,
.q-adult-notes,
.q-concept-diagram,
.q-interactive {
  padding: clamp(1.35rem, 3vw, 2rem);
  border: 1px solid var(--q-border);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 6px 24px rgba(16, 42, 67, 0.055);
}

.q-objectives {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 1.5rem;
  background: linear-gradient(135deg, #f3f7ff, #fff);
}

.q-objectives ul,
.q-activity ol,
.q-recap ul {
  display: grid;
  gap: 0.7rem;
  margin: 0;
}

.q-inline-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding: 0;
  list-style: none;
}

.q-inline-list li {
  padding: 0.45rem 0.7rem;
  border-radius: 9px;
  background: var(--q-soft);
  color: var(--q-muted);
  font-size: 0.86rem;
}

.q-story {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.2rem;
  background: #f8f4ff;
}

.q-story-mark {
  color: var(--q-violet);
  font-family: Georgia, serif;
  font-size: 4.5rem;
  line-height: 0.8;
}

.q-story p:last-child {
  margin: 0;
  color: #4f466e;
  font-size: 1.06rem;
}

.q-explanation > section {
  padding-top: 1rem;
  border-top: 1px solid var(--q-border);
}

.q-explanation > section + section {
  margin-top: 1rem;
}

.q-explanation > section p {
  max-width: 75ch;
  margin-bottom: 0;
  color: #344c64;
  font-size: 1.03rem;
}

.q-analogy {
  border-color: rgba(104, 86, 207, 0.28);
  background: #f8f6ff;
}

.q-analogy-heading {
  display: flex;
  gap: 0.9rem;
  align-items: center;
}

.q-analogy-heading > span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--q-violet);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 900;
}

.q-analogy-limit {
  padding: 1rem;
  margin-top: 1rem;
  border-left: 4px solid var(--q-coral);
  border-radius: 0 12px 12px 0;
  background: #fff;
}

.q-analogy-limit p {
  margin: 0.2rem 0 0;
  color: #694440;
}

.q-concept-diagram {
  overflow: hidden;
  background:
    linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.9)),
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(40, 100, 220, 0.08) 24px);
}

.q-diagram-stage {
  display: flex;
  gap: 0.7rem;
  align-items: stretch;
  justify-content: center;
  min-height: 150px;
  padding: 1rem 0;
}

.q-diagram-stage > i {
  align-self: center;
  color: var(--q-accent);
  font-size: 1.5rem;
  font-style: normal;
  font-weight: 900;
}

.q-diagram-node {
  display: grid;
  flex: 1 1 0;
  place-items: center;
  max-width: 185px;
  padding: 0.8rem;
  border: 1px solid var(--q-border);
  border-radius: 16px;
  background: #fff;
  text-align: center;
}

.q-diagram-node > span {
  display: block;
  width: 54px;
  height: 54px;
  margin-bottom: 0.5rem;
  border: 10px solid color-mix(in srgb, var(--q-accent) 22%, white);
  border-radius: 50%;
  background: var(--q-accent);
  box-shadow: inset 0 0 0 4px #fff;
}

.q-diagram-node:nth-of-type(2n) > span {
  border-radius: 14px;
  background: var(--q-violet);
  transform: rotate(12deg);
}

.q-diagram-node:nth-of-type(3n) > span {
  background: var(--q-teal);
  transform: scale(0.8);
}

.q-diagram-node small {
  color: var(--q-muted);
}

.q-concept-diagram figcaption {
  padding-top: 1rem;
  border-top: 1px solid var(--q-border);
  color: var(--q-muted);
}

.q-concept-diagram figcaption strong {
  display: block;
  color: var(--q-ink);
}

/* Interactive teaching models */

.q-interactive {
  border-color: color-mix(in srgb, var(--q-accent) 35%, white);
  background: linear-gradient(145deg, #fff, color-mix(in srgb, var(--q-accent) 4%, white));
}

.q-interactive-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
  margin-bottom: 1.3rem;
}

.q-interactive-heading p:last-child {
  max-width: 68ch;
  color: var(--q-muted);
}

.q-interactive-workspace {
  display: grid;
  grid-template-columns: minmax(240px, 0.85fr) minmax(280px, 1.15fr);
  min-height: 360px;
  overflow: hidden;
  border: 1px solid var(--q-border);
  border-radius: 18px;
  background: #fff;
}

.q-interactive-controls {
  display: grid;
  align-content: start;
  gap: 1rem;
  padding: 1.2rem;
  border-right: 1px solid var(--q-border);
  background: #f5f8fc;
}

.q-control-field {
  display: grid;
  gap: 0.4rem;
  font-weight: 800;
}

.q-control-field input[type="range"] {
  min-height: 44px;
  padding: 0;
  accent-color: var(--q-accent);
}

.q-control-field select {
  min-height: 48px;
  background: #fff;
}

.q-control-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.q-control-actions .btn {
  flex: 1 1 110px;
  min-width: 0;
  padding-inline: 0.8rem;
}

.q-switch-fieldset,
.q-claim-fieldset {
  padding: 0;
  border: 0;
}

.q-switch-fieldset legend,
.q-claim-fieldset legend {
  margin-bottom: 0.6rem;
  font-weight: 800;
}

.q-switches {
  display: grid;
  grid-template-columns: repeat(4, minmax(44px, 1fr));
  gap: 0.45rem;
}

.q-bit-switch,
.q-gate,
.q-claim-fieldset button {
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--q-border);
  border-radius: 10px;
  background: #fff;
  color: var(--q-ink);
  font-weight: 900;
  cursor: pointer;
}

.q-bit-switch[aria-pressed="true"] {
  border-color: var(--q-accent);
  background: var(--q-accent);
  color: #fff;
}

.q-gate-palette {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.q-gate {
  border-color: color-mix(in srgb, var(--q-accent) 35%, white);
  color: var(--q-accent-dark);
}

.q-gate:hover,
.q-gate:focus-visible {
  background: color-mix(in srgb, var(--q-accent) 10%, white);
}

.q-circuit {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  min-height: 72px;
  padding: 0.8rem;
  overflow-x: auto;
  border: 2px dashed #aab9c9;
  border-radius: 12px;
  background:
    linear-gradient(#fff, #fff) padding-box,
    linear-gradient(90deg, transparent 47%, #9aacbf 48% 52%, transparent 53%) border-box;
}

.q-circuit.is-dragover {
  border-color: var(--q-accent);
  background-color: color-mix(in srgb, var(--q-accent) 7%, white);
}

.q-circuit-start,
.q-circuit-measure,
.q-circuit-operation {
  flex: 0 0 auto;
  padding: 0.5rem 0.65rem;
  border-radius: 9px;
  background: #fff;
  color: var(--q-ink);
  font-weight: 800;
}

.q-circuit-operation {
  min-width: 44px;
  min-height: 44px;
  border: 2px solid var(--q-accent);
  color: var(--q-accent-dark);
  cursor: pointer;
}

.q-circuit-measure {
  border: 1px solid var(--q-border);
}

.q-circuit-empty {
  flex: 1 0 130px;
  color: var(--q-muted);
  font-size: 0.82rem;
  text-align: center;
}

.q-endianness {
  margin: -0.4rem 0 0;
  color: var(--q-muted);
  font-size: 0.75rem;
}

.q-claim-fieldset > p {
  padding: 0.8rem;
  border-left: 4px solid var(--q-gold);
  background: #fff9e8;
  font-weight: 700;
}

.q-claim-fieldset > div {
  display: grid;
  gap: 0.45rem;
}

.q-interactive-display {
  position: relative;
  display: grid;
  grid-template-columns: minmax(90px, 0.6fr) minmax(170px, 1.4fr);
  gap: 1.2rem;
  align-items: center;
  padding: 1.5rem;
  overflow: hidden;
  background:
    radial-gradient(circle at 80% 12%, color-mix(in srgb, var(--q-accent) 13%, transparent), transparent 12rem),
    #fff;
}

.q-interactive-display .q-model-orbit {
  align-self: center;
}

.q-wave-track {
  position: absolute;
  top: 18%;
  right: 8%;
  left: 8%;
  display: none;
  height: 50px;
  overflow: hidden;
}

.q-wave-track span {
  display: block;
  width: 200%;
  height: 100%;
  background:
    radial-gradient(30px 28px at 30px 0, transparent 96%, var(--q-accent) 100%) 0 24px / 60px 50px repeat-x,
    radial-gradient(30px 28px at 30px 50px, transparent 96%, var(--q-accent) 100%) 30px -24px / 60px 50px repeat-x;
}

.q-interactive[data-kind="photon-wave"] .q-wave-track,
.q-interactive[data-kind="double-slit"] .q-wave-track {
  display: block;
}

.q-interactive[data-kind="photon-wave"] .q-model-orbit,
.q-interactive[data-kind="double-slit"] .q-model-orbit {
  opacity: 0.2;
}

.q-probability-bars {
  display: flex;
  gap: 1rem;
  align-self: stretch;
  justify-content: center;
  min-height: 210px;
}

.q-probability-bars > div {
  display: grid;
  grid-template-rows: 1fr auto;
  width: min(74px, 40%);
  text-align: center;
}

.q-probability-bars span {
  display: block;
  align-self: end;
  min-height: 4px;
  border-radius: 10px 10px 2px 2px;
  background: var(--q-accent);
  transition: height 300ms ease;
}

.q-probability-bars > div:nth-child(2) span {
  background: var(--q-violet);
}

.q-probability-bars strong {
  padding-top: 0.4rem;
}

.q-histogram {
  grid-column: 1 / -1;
  display: flex;
  gap: 0.35rem;
  align-items: end;
  min-height: 52px;
}

.q-histogram span {
  flex: 1 1 auto;
  min-width: 5px;
  border-radius: 4px 4px 0 0;
  background: color-mix(in srgb, var(--q-accent) 75%, white);
}

.q-result {
  grid-column: 1 / -1;
  padding: 0.9rem;
  margin: 0;
  border-radius: 12px;
  background: #eff5fb;
  color: #27445f;
  font-weight: 700;
}

.q-interactive-caption,
.q-text-alternative,
.q-noscript {
  margin-top: 1rem;
}

.q-interactive-caption {
  color: var(--q-muted);
}

.q-text-alternative {
  border-top: 1px solid var(--q-border);
  padding-top: 0.8rem;
}

.q-text-alternative summary {
  min-height: 44px;
  color: var(--q-accent-dark);
  font-weight: 800;
  cursor: pointer;
}

.q-interactive.is-playing .q-model-orbit {
  animation: q-gentle-turn 4s linear infinite;
}

.q-interactive.is-playing .q-wave-track span {
  animation: q-wave-move 3s linear infinite;
}

.q-interactive.is-paused * {
  animation-play-state: paused !important;
}

@keyframes q-gentle-turn {
  to { transform: rotate(360deg); }
}

@keyframes q-wave-move {
  to { transform: translateX(-60px); }
}

.q-evidence {
  padding: 1rem;
  margin: 1rem 0 0;
  border-radius: 12px;
  background: #edf8f5;
  color: #255c50;
}

.q-misconception {
  display: flex;
  gap: 1rem;
  border-color: rgba(217, 79, 72, 0.28);
  background: #fff4f2;
}

.q-misconception > span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--q-coral);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 900;
}

.q-misconception h2 {
  color: #74322e;
  font-size: 1.25rem;
}

.q-misconception p:last-child {
  margin: 0;
  color: #673e3b;
}

.q-glossary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.q-glossary > div {
  padding: 1rem;
  border: 1px solid var(--q-border);
  border-radius: 13px;
  background: #f8fafc;
}

.q-glossary dt {
  color: var(--q-accent-dark);
  font-weight: 900;
}

.q-glossary dd {
  margin: 0.25rem 0 0;
  color: var(--q-muted);
}

.q-recap {
  border-color: rgba(12, 146, 120, 0.28);
  background: #effbf7;
}

.q-recap li::marker {
  color: var(--q-teal);
  font-weight: 900;
}

/* Quiz */

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

.q-best-score {
  flex: 0 0 auto;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  background: #fff3c9;
  color: #604700;
  font-weight: 900;
}

.q-question {
  padding: 1.3rem 0 0;
  margin: 1.3rem 0 0;
  border: 0;
  border-top: 1px solid var(--q-border);
}

.q-question legend {
  display: flex;
  gap: 0.7rem;
  align-items: start;
  width: 100%;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
}

.q-question legend > span {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: var(--q-accent);
  color: #fff;
  font-size: 0.85rem;
}

.q-options {
  display: grid;
  gap: 0.6rem;
  margin-top: 1rem;
}

.q-options label {
  position: relative;
  cursor: pointer;
}

.q-options input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.q-options label > span {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  min-height: 52px;
  padding: 0.75rem;
  border: 2px solid var(--q-border);
  border-radius: 13px;
  background: #fff;
}

.q-options label > span > b {
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: #eaf0f7;
  color: var(--q-ink);
}

.q-options input:focus-visible + span {
  outline: 3px solid var(--q-gold);
  outline-offset: 2px;
}

.q-options input:checked + span {
  border-color: var(--q-accent);
  background: color-mix(in srgb, var(--q-accent) 6%, white);
}

.q-options label.is-correct > span {
  border-color: var(--q-teal);
  background: #effbf7;
}

.q-options label.is-incorrect > span {
  border-color: var(--q-coral);
  background: #fff4f2;
}

.q-question-feedback {
  min-height: 1.5rem;
  margin-top: 0.7rem;
  color: var(--q-muted);
  font-weight: 700;
}

.q-question-feedback.is-correct {
  color: var(--q-teal-dark);
}

.q-question-feedback.is-incorrect {
  color: #9b3833;
}

.q-quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.q-quiz-result {
  margin-top: 1rem;
}

.q-quiz-result:not(:empty) {
  padding: 1rem;
  border-radius: 13px;
  background: var(--q-soft);
  font-weight: 800;
}

.q-extension,
.q-adult-notes {
  padding: 0;
  overflow: clip;
}

.q-extension summary,
.q-adult-notes summary {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 78px;
  padding: 1rem 1.4rem;
  cursor: pointer;
}

.q-extension summary {
  background: #f8f6ff;
}

.q-adult-notes summary {
  background: #f3f7fb;
}

.q-extension summary > span,
.q-adult-notes summary > span {
  color: var(--q-accent);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.q-extension > div,
.q-adult-notes > div {
  padding: 1.4rem;
  border-top: 1px solid var(--q-border);
}

.q-adult-note-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.q-adult-notes > a {
  display: inline-block;
  margin: 0 1.4rem 1.4rem;
  color: var(--q-accent);
  font-weight: 800;
}

.q-sources ol,
.q-source-registry ol {
  display: grid;
  gap: 0.75rem;
  padding-left: 1.35rem;
}

.q-sources li,
.q-source-registry li {
  padding-left: 0.35rem;
}

.q-sources a,
.q-source-registry a {
  color: var(--q-accent-dark);
  font-weight: 800;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.q-sources li > span,
.q-source-registry li > span {
  display: block;
  color: var(--q-muted);
  font-size: 0.82rem;
}

.q-review-status {
  padding-top: 0.8rem;
  margin-top: 1rem;
  border-top: 1px solid var(--q-border);
  color: var(--q-muted);
  font-size: 0.86rem;
}

.q-lesson-navigation {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.q-lesson-navigation a {
  display: grid;
  min-height: 76px;
  padding: 1rem;
  border: 1px solid var(--q-border);
  border-radius: 15px;
  background: #fff;
}

.q-lesson-navigation a:last-child {
  text-align: right;
}

.q-lesson-navigation span {
  color: var(--q-muted);
  font-size: 0.78rem;
}

.q-lesson-navigation strong {
  color: var(--q-accent-dark);
}

.q-lesson-sidebar {
  position: sticky;
  top: 100px;
  display: grid;
  gap: 1rem;
}

.q-sidebar-card,
.q-on-this-page {
  padding: 1.2rem;
  border: 1px solid var(--q-border);
  border-radius: 17px;
  background: #fff;
  box-shadow: 0 5px 18px rgba(16, 42, 67, 0.055);
}

.q-sidebar-progress .btn {
  width: 100%;
  margin-top: 0.6rem;
}

.q-sidebar-progress .btn:disabled {
  background: var(--q-teal);
  opacity: 1;
  cursor: default;
}

.q-complete-status {
  min-height: 1.4rem;
  margin: 0.6rem 0 0;
  color: var(--q-teal-dark);
  font-size: 0.82rem;
  font-weight: 700;
}

.q-on-this-page {
  display: grid;
  gap: 0.3rem;
}

.q-on-this-page h2 {
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.q-on-this-page a {
  min-height: 44px;
  padding: 0.45rem 0.55rem;
  border-radius: 9px;
  color: var(--q-muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.q-on-this-page a:hover {
  background: var(--q-soft);
  color: var(--q-accent-dark);
}

.q-print-button {
  width: 100%;
}

.q-simulator-label {
  padding: 0.8rem;
  border: 1px solid var(--q-border);
  border-radius: 12px;
  background: #f4f7fa;
  color: var(--q-muted);
  font-size: 0.75rem;
}

/* Adult guide */

.q-guide-summary {
  padding-top: 3rem;
}

.q-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.q-guide-grid article {
  padding: 1.5rem;
  border: 1px solid var(--q-border);
  border-radius: 17px;
  background: #fff;
}

.q-guide-grid li + li {
  margin-top: 0.45rem;
}

.q-term-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.q-term-list span {
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  background: var(--q-soft);
  color: var(--q-accent-dark);
  font-size: 0.85rem;
  font-weight: 800;
}

.q-week-guides {
  display: grid;
  gap: 1.1rem;
}

.q-week-guides > article {
  padding: 1.4rem;
  border: 1px solid var(--q-border);
  border-radius: 18px;
  background: #fff;
}

.q-week-guides > article > header {
  display: flex;
  gap: 1rem;
  align-items: start;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--q-border);
}

.q-week-guides > article > header > span {
  flex: 0 0 auto;
  padding: 0.45rem 0.7rem;
  border-radius: 9px;
  background: var(--q-accent);
  color: #fff;
  font-weight: 900;
}

.q-week-guides header p {
  margin: 0;
  color: var(--q-muted);
}

.q-week-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding-block: 1rem;
}

.q-week-guide-grid section {
  padding: 1rem;
  border-radius: 13px;
  background: #f6f9fc;
}

.q-week-guide-grid h4 {
  margin-bottom: 0.5rem;
}

.q-week-guide-grid p:last-child,
.q-week-guide-grid ul {
  margin-bottom: 0;
}

.q-week-guides > article > a {
  color: var(--q-accent-dark);
  font-weight: 800;
}

/* Private progress dashboard */

.q-progress-dashboard {
  display: grid;
  gap: 1.4rem;
}

.q-dashboard-hero {
  padding: 1.7rem;
  border: 1px solid var(--q-border);
  border-radius: 22px;
  background:
    radial-gradient(circle at 92% 5%, rgba(104, 86, 207, 0.2), transparent 15rem),
    linear-gradient(135deg, #eff5ff, #f8f6ff);
}

.q-dashboard-hero h1 {
  font-size: clamp(2rem, 4vw, 3.3rem);
}

.q-learner-progress {
  padding: 1.4rem;
  border: 1px solid var(--q-border);
  border-radius: 20px;
  background: #fff;
}

.q-learner-progress > header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--q-border);
}

.q-learner-progress > header dl {
  display: flex;
  gap: 0.7rem;
  margin: 0;
}

.q-learner-progress > header dl div {
  padding: 0.6rem 0.8rem;
  border-radius: 10px;
  background: var(--q-soft);
}

.q-learner-progress dt {
  color: var(--q-muted);
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
}

.q-learner-progress dd {
  margin: 0;
  font-weight: 900;
}

.q-progress-pathways {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  padding-block: 1rem;
}

.q-progress-pathways > article {
  padding: 1rem;
  border: 1px solid var(--q-border);
  border-radius: 15px;
}

.q-progress-pathways .q-pathway-symbol {
  width: 46px;
  min-width: 46px;
  height: 46px;
  border-radius: 13px;
}

.q-score-line {
  color: var(--q-muted);
  font-size: 0.82rem;
}

.q-progress-pathways .btn {
  width: 100%;
  margin-top: 0.4rem;
}

.q-private-badges {
  padding-top: 1rem;
  border-top: 1px solid var(--q-border);
}

.q-private-badges > div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.q-private-badges span {
  display: inline-flex;
  gap: 0.5rem;
  align-items: center;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--q-border);
  border-radius: 999px;
  background: #fff9e8;
  font-weight: 800;
}

.q-private-badges > p {
  margin: 0.7rem 0 0;
  color: var(--q-muted);
  font-size: 0.82rem;
}

.q-empty-state {
  padding: 3rem 1.5rem;
  border: 1px dashed #9eafc1;
  border-radius: 20px;
  background: #fff;
  text-align: center;
}

.q-empty-state > span {
  font-size: 2.5rem;
}

/* Certificate */

.q-certificate-page {
  padding: 2rem 0 5rem;
  background: #eef3f9;
}

.q-certificate-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.q-certificate-notice {
  max-width: 900px;
  padding: 1rem;
  margin: 0 auto 1rem;
  border: 1px solid #d19b0e;
  border-radius: 12px;
  background: #fff7d9;
  color: #604700;
}

.q-certificate-notice p {
  margin: 0.2rem 0 0;
}

.q-certificate {
  max-width: 980px;
  padding: 1.2rem;
  margin: auto;
  background: #fff;
  box-shadow: var(--q-shadow);
}

.q-certificate.is-preview {
  opacity: 0.78;
}

.q-certificate-border {
  position: relative;
  display: grid;
  justify-items: center;
  min-height: 680px;
  padding: clamp(2rem, 6vw, 4.5rem);
  border: 8px double #214a7a;
  background:
    radial-gradient(circle at 50% 50%, rgba(243, 182, 31, 0.08), transparent 20rem),
    #fffef9;
  text-align: center;
}

.q-certificate-border::before,
.q-certificate-border::after {
  position: absolute;
  width: 70px;
  height: 70px;
  border: 8px solid var(--q-gold);
  content: "";
  transform: rotate(45deg);
}

.q-certificate-border::before {
  top: 24px;
  left: 24px;
  border-right-color: transparent;
  border-bottom-color: transparent;
}

.q-certificate-border::after {
  right: 24px;
  bottom: 24px;
  border-top-color: transparent;
  border-left-color: transparent;
}

.q-certificate header p {
  margin: 0;
  color: var(--q-muted);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.q-certificate h1 {
  max-width: none;
  color: #15375c;
  font-family: Georgia, serif;
  font-size: clamp(2.3rem, 6vw, 4.4rem);
}

.q-certificate h2 {
  padding: 0.4rem 1.5rem;
  border-bottom: 2px solid var(--q-gold);
  font-family: Georgia, serif;
  font-size: clamp(2rem, 5vw, 3.6rem);
}

.q-certificate h3 {
  color: #214a7a;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

.q-certificate-mark {
  display: grid;
  place-items: center;
  width: 66px;
  height: 66px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: #214a7a;
  color: #fff;
  font-size: 1.3rem;
  font-weight: 900;
}

.q-certificate-awarded {
  margin: 1rem 0 0;
  color: var(--q-muted);
  text-transform: uppercase;
}

.q-certificate-detail,
.q-certificate-statement {
  max-width: 680px;
  color: var(--q-muted);
}

.q-certificate-badge {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  padding: 0.8rem 1.2rem;
  border: 1px solid #e1b137;
  border-radius: 16px;
  background: #fff7d9;
}

.q-certificate-badge > span {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--q-gold);
  color: #102a43;
  font-weight: 900;
}

.q-certificate-badge div {
  display: grid;
  text-align: left;
}

.q-certificate footer {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 3rem;
  width: min(100%, 620px);
  margin-top: 1rem;
}

.q-certificate footer div {
  display: grid;
  border-top: 1px solid #60758b;
  padding-top: 0.4rem;
}

.q-certificate footer small,
.q-certificate-private {
  color: var(--q-muted);
  font-size: 0.75rem;
}

.q-certificate-private {
  align-self: end;
  margin: 1rem 0 0;
}

/* Responsive layouts */

@media (max-width: 1050px) {
  .q-pathway-grid,
  .q-progress-pathways {
    grid-template-columns: 1fr;
  }

  .q-pathway-card {
    min-height: auto;
  }

  .q-week-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .q-how-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .q-lesson-layout {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 1.5rem;
  }
}

@media (max-width: 900px) {
  .q-hero-grid,
  .q-pathway-hero-grid,
  .q-intro-grid,
  .q-support-grid,
  .q-accuracy-wide,
  .q-lesson-hero-grid {
    grid-template-columns: 1fr;
  }

  .q-hero-model {
    min-height: 280px;
  }

  .q-pathway-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .q-level-grid {
    grid-template-columns: 1fr 1fr;
  }

  .q-level-grid > div {
    grid-column: 1 / -1;
  }

  .q-lesson-layout {
    grid-template-columns: 1fr;
  }

  .q-lesson-sidebar {
    position: static;
    grid-row: 1;
    grid-template-columns: 1fr 1fr;
  }

  .q-simulator-label,
  .q-print-button {
    grid-column: 1 / -1;
  }

  .q-guide-grid,
  .q-week-guide-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .q-section {
    padding-block: 3.5rem;
  }

  .q-hero {
    padding-block: 4rem;
  }

  .q-hero-model {
    grid-template-columns: 1fr;
  }

  .q-hero-flow {
    transform: rotate(90deg);
  }

  .q-hero-atom,
  .q-hero-qubit,
  .q-hero-result {
    width: 110px;
    height: 110px;
  }

  .q-pathway-facts,
  .q-card-facts,
  .q-week-timeline,
  .q-objectives,
  .q-glossary,
  .q-adult-note-grid,
  .q-lesson-navigation,
  .q-learner-progress > header,
  .q-certificate footer {
    grid-template-columns: 1fr;
  }

  .q-week-timeline a {
    min-height: 88px;
  }

  .q-how-grid {
    grid-template-columns: 1fr;
  }

  .q-level-grid {
    grid-template-columns: 1fr;
  }

  .q-level-grid > div {
    grid-column: auto;
  }

  .q-interactive-heading {
    display: grid;
  }

  .q-interactive-workspace {
    grid-template-columns: 1fr;
  }

  .q-interactive-controls {
    border-right: 0;
    border-bottom: 1px solid var(--q-border);
  }

  .q-interactive-display {
    min-height: 330px;
  }

  .q-diagram-stage {
    align-items: center;
    flex-direction: column;
  }

  .q-diagram-stage > i {
    transform: rotate(90deg);
  }

  .q-diagram-node {
    width: 100%;
    max-width: none;
  }

  .q-lesson-sidebar {
    grid-template-columns: 1fr;
  }

  .q-simulator-label,
  .q-print-button {
    grid-column: auto;
  }

  .q-lesson-navigation a:last-child {
    text-align: left;
  }

  .q-search > div {
    grid-template-columns: 1fr;
  }

  .q-certificate-border {
    padding: 2rem 1.2rem;
  }

  .q-certificate footer {
    gap: 1.5rem;
  }

  .q-learner-progress > header {
    display: grid;
    align-items: start;
  }
}

@media (max-width: 480px) {
  .q-hero-actions,
  .q-card-actions,
  .q-quiz-actions,
  .q-certificate-actions {
    display: grid;
  }

  .q-hero-actions .btn,
  .q-card-actions .btn,
  .q-quiz-actions .btn,
  .q-certificate-actions .btn {
    width: 100%;
  }

  .q-lesson-card,
  .q-explanation,
  .q-quiz,
  .q-sources,
  .q-recap,
  .q-story,
  .q-analogy,
  .q-misconception,
  .q-extension,
  .q-adult-notes,
  .q-concept-diagram,
  .q-interactive {
    padding: 1.15rem;
    border-radius: 16px;
  }

  .q-extension,
  .q-adult-notes {
    padding: 0;
  }

  .q-interactive-display {
    grid-template-columns: 1fr;
    padding: 1rem;
  }

  .q-probability-bars {
    min-height: 180px;
  }

  .q-switches {
    grid-template-columns: repeat(4, 1fr);
  }

  .q-options label > span {
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .quantum-page,
  .quantum-page *,
  .quantum-page *::before,
  .quantum-page *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media print {
  @page {
    size: A4;
    margin: 12mm;
  }

  .quantum-page {
    background: #fff !important;
    color: #000;
    font-size: 10.5pt;
  }

  .quantum-page .site-header,
  .quantum-page .site-footer,
  .quantum-page .announcement-bar,
  .quantum-page .academy-final-cta,
  .quantum-page .q-on-this-page,
  .quantum-page .q-lesson-navigation,
  .quantum-page .q-control-actions,
  .quantum-page .q-gate-palette,
  .quantum-page .q-print-button,
  .quantum-page .q-quiz-actions,
  .no-print {
    display: none !important;
  }

  .quantum-page .container {
    width: 100%;
    max-width: none;
  }

  .q-section,
  .q-pathway-hero,
  .q-guide-hero,
  .q-lesson-hero {
    padding: 10mm 0;
    background: #fff !important;
  }

  .q-lesson-layout {
    display: block;
    padding: 8mm 0;
  }

  .q-lesson-main {
    gap: 5mm;
  }

  .q-lesson-sidebar {
    position: static;
    margin-top: 5mm;
  }

  .q-lesson-card,
  .q-explanation,
  .q-quiz,
  .q-sources,
  .q-recap,
  .q-story,
  .q-analogy,
  .q-misconception,
  .q-extension,
  .q-adult-notes,
  .q-concept-diagram,
  .q-interactive,
  .q-week-guides > article,
  .q-guide-grid article {
    break-inside: avoid;
    box-shadow: none;
  }

  .q-interactive-workspace {
    min-height: auto;
  }

  .q-interactive-controls {
    display: none;
  }

  .q-interactive-display {
    min-height: 70mm;
  }

  .q-extension,
  .q-adult-notes {
    display: block;
  }

  .q-extension > div,
  .q-adult-notes > div {
    display: block !important;
  }

  .q-certificate-page {
    padding: 0;
    background: #fff;
  }

  .q-certificate {
    padding: 0;
    box-shadow: none;
    opacity: 1 !important;
  }

  .q-certificate-border {
    min-height: 250mm;
  }
}