@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Manrope:wght@400;600;700;800&family=Newsreader:ital,opsz,wght@1,6..72,600&display=swap');

:root {
  color-scheme: light;
  --paper: #fff9e8;
  --surface: #fffdf6;
  --ink: #211a16;
  --muted: #665d54;
  --line: #d9cdb5;
  --burgundy: #a70020;
  --burgundy-deep: #730016;
  --gold: #f3c700;
  --gold-soft: #ffe66a;
  --display: "Manrope", ui-sans-serif, system-ui, sans-serif;
  --serif: "Newsreader", Georgia, serif;
  --utility: "DM Mono", ui-monospace, monospace;
}

[data-theme="dark"] {
  color-scheme: dark;
  --paper: #211316;
  --surface: #2c181c;
  --ink: #fff7df;
  --muted: #d2c2b3;
  --line: #674049;
  --burgundy: #d32243;
  --burgundy-deep: #f04463;
  --gold: #f4cd1f;
  --gold-soft: #ffe66a;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--line) 26%, transparent) 1px, transparent 1px) 50% 0 / min(8.33vw, 110px) 100%,
    var(--paper);
  color: var(--ink);
  font-family: var(--display);
  transition: background-color 180ms ease, color 180ms ease;
}

a, button { font: inherit; }

button, textarea, input { accent-color: var(--burgundy); }

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 4px;
}

h1[tabindex="-1"]:focus,
h2[tabindex="-1"]:focus { outline: none; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1240px, calc(100% - 3rem));
  margin: 0 auto;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.school-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--ink);
  text-decoration: none;
}

.school-brand img {
  width: 52px;
  height: auto;
  filter: drop-shadow(0 2px 1px rgb(33 26 22 / 12%));
}

.school-brand__copy { display: grid; }

.school-brand strong {
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -0.035em;
}

.school-brand small {
  margin-top: 0.1rem;
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.theme-toggle {
  padding: 0.58rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 76%, transparent);
  color: var(--muted);
  cursor: pointer;
  font-family: var(--utility);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-back {
  color: var(--muted);
  font-family: var(--utility);
  font-size: 0.7rem;
  font-weight: 500;
  text-decoration: none;
  text-transform: uppercase;
}

.header-back:hover { color: var(--ink); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(390px, 0.9fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: center;
  width: min(1240px, calc(100% - 3rem));
  min-height: 78vh;
  margin: 0 auto;
  padding: clamp(4.5rem, 9vw, 8rem) 0;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 0 0 1.5rem;
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.eyebrow span {
  padding: 0.25rem 0.45rem;
  background: var(--gold);
  color: #211a16;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(4rem, 8.5vw, 8.5rem);
  font-weight: 800;
  line-height: 0.84;
  letter-spacing: -0.085em;
}

.hero h1 em {
  color: var(--burgundy);
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.045em;
}

.hero-intro {
  max-width: 610px;
  margin: 2.2rem 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.6vw, 1.32rem);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

.primary-link {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 0.95rem 1.15rem;
  background: var(--burgundy);
  color: #fff;
  font-size: 0.88rem;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 6px 6px 0 var(--gold);
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.primary-link:hover {
  transform: translate(3px, 3px);
  box-shadow: 3px 3px 0 var(--gold);
}

.hero-actions p {
  max-width: 180px;
  margin: 0;
  color: var(--muted);
  font-family: var(--utility);
  font-size: 0.66rem;
  line-height: 1.55;
  text-transform: uppercase;
}

.lab-card {
  position: relative;
  padding: clamp(1.7rem, 4vw, 2.7rem);
  overflow: hidden;
  border: 1px solid var(--ink);
  background: var(--surface);
  box-shadow: 13px 13px 0 var(--burgundy);
  transform: rotate(1.2deg);
}

.lab-card::before {
  position: absolute;
  top: -30px;
  right: -28px;
  width: 118px;
  height: 118px;
  border: 18px solid var(--gold);
  border-radius: 50%;
  content: "";
  opacity: 0.88;
}

.lab-card__topline {
  display: flex;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.lab-card h2 {
  max-width: 360px;
  margin: 2rem 0 0.7rem;
  font-size: clamp(1.9rem, 3.2vw, 3rem);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.lab-card > p {
  max-width: 330px;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.revision-cycle {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.revision-cycle li {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0 0.8rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
}

.revision-cycle span {
  grid-row: 1 / 3;
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.7rem;
  font-weight: 500;
}

.revision-cycle strong {
  font-size: 1.05rem;
  letter-spacing: -0.025em;
}

.revision-cycle small {
  margin-top: 0.16rem;
  color: var(--muted);
  font-size: 0.76rem;
}

.lab-card__stamp {
  position: absolute;
  right: 1.2rem;
  bottom: 1.1rem;
  display: grid;
  place-items: center;
  width: 62px;
  height: 62px;
  border: 2px solid var(--burgundy);
  border-radius: 50%;
  color: var(--burgundy);
  font-family: var(--utility);
  font-size: 0.68rem;
  font-weight: 500;
  line-height: 1.1;
  text-align: center;
  text-transform: uppercase;
  transform: rotate(-10deg);
}

.lab-card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin-top: 1.25rem;
  color: var(--burgundy-deep);
  font-size: 0.76rem;
  font-weight: 800;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25rem;
}

/* Interactive retrieval module */

.module-page { background-attachment: fixed; }

.module {
  display: grid;
  grid-template-columns: 210px minmax(0, 820px);
  gap: clamp(2.5rem, 7vw, 7rem);
  width: min(1180px, calc(100% - 3rem));
  margin: 0 auto;
  padding: clamp(3.5rem, 7vw, 6.5rem) 0 7rem;
}

.module-rail {
  position: sticky;
  top: 1.5rem;
  align-self: start;
}

.module-rail__time {
  margin: 0 0 1.3rem;
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.module-progress {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.module-progress li {
  display: grid;
  grid-template-columns: 2.1rem 1fr;
  align-items: center;
  min-height: 47px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  transition: color 160ms ease, padding 160ms ease;
}

.module-progress li span {
  font-family: var(--utility);
  font-size: 0.63rem;
  font-weight: 500;
}

.module-progress li.is-current {
  padding-left: 0.55rem;
  border-left: 4px solid var(--gold);
  color: var(--ink);
}

.module-progress li.is-complete { color: var(--burgundy-deep); }

.module-progress li.is-complete span::after {
  margin-left: 0.25rem;
  content: "✓";
}

.module-rail__note {
  margin: 1.3rem 0 0;
  color: var(--muted);
  font-size: 0.67rem;
  line-height: 1.55;
}

.experiment { min-width: 0; }

.module-screen {
  animation: screen-in 280ms ease both;
}

@keyframes screen-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.experiment-number,
.screen-step {
  margin: 0 0 1.25rem;
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.module-screen h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(3.2rem, 7vw, 6.7rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.075em;
}

.module-screen h1 em {
  color: var(--burgundy);
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.035em;
}

.module-screen h2 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.45rem, 5vw, 4.7rem);
  line-height: 0.96;
  letter-spacing: -0.06em;
}

.module-lead,
.screen-intro {
  max-width: 680px;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  line-height: 1.65;
}

.module-lead { margin: 1.7rem 0 0; }
.screen-intro { margin: 1.1rem 0 2.3rem; }

.experiment-setup {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: clamp(2.5rem, 5vw, 4rem) 0;
  border-block: 1px solid var(--line);
}

.experiment-setup div {
  padding: 1.35rem 1.35rem 1.5rem 0;
}

.experiment-setup div + div {
  padding-left: 1.35rem;
  border-left: 1px solid var(--line);
}

.experiment-setup span {
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.66rem;
}

.experiment-setup p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.experiment-setup strong { color: var(--ink); }

.module-action-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.module-action-row p {
  max-width: 260px;
  margin: 0;
  color: var(--muted);
  font-family: var(--utility);
  font-size: 0.64rem;
  line-height: 1.55;
  text-transform: uppercase;
}

.module-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  min-height: 50px;
  padding: 0.9rem 1.15rem;
  border: 1px solid var(--burgundy);
  border-radius: 0;
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 800;
  text-decoration: none;
}

.module-button--primary {
  background: var(--burgundy);
  color: #fff;
  box-shadow: 6px 6px 0 var(--gold);
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.module-button--primary:hover {
  transform: translate(3px, 3px);
  box-shadow: 3px 3px 0 var(--gold);
}

.module-button--secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

.study-sheet {
  position: relative;
  max-width: 700px;
  padding: clamp(1.5rem, 4vw, 2.6rem);
  overflow: hidden;
  border: 1px solid var(--ink);
  background: var(--surface);
  box-shadow: 10px 10px 0 var(--burgundy);
}

.study-sheet::after {
  position: absolute;
  right: -35px;
  bottom: -35px;
  width: 105px;
  height: 105px;
  border: 16px solid var(--gold);
  border-radius: 50%;
  content: "";
}

.study-sheet p {
  position: relative;
  z-index: 1;
  max-width: 600px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.16rem);
  line-height: 1.65;
}

.study-sheet p + p { margin-top: 1rem; }

.study-sheet .study-sheet__question {
  padding-bottom: 1.15rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: clamp(1.35rem, 2.7vw, 2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.study-sheet strong {
  color: var(--ink);
  box-shadow: inset 0 -0.35em 0 color-mix(in srgb, var(--gold) 55%, transparent);
}

.study-timer {
  display: grid;
  grid-template-columns: auto min-content auto 1fr;
  gap: 0.65rem;
  align-items: center;
  max-width: 700px;
  margin: 2rem 0;
  color: var(--muted);
  font-family: var(--utility);
  font-size: 0.64rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.study-timer strong {
  color: var(--burgundy-deep);
  font-size: 1rem;
}

.study-timer__track {
  height: 5px;
  overflow: hidden;
  background: var(--line);
}

.study-timer__track span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--burgundy);
  transform-origin: left;
}

.answer-field {
  display: grid;
  max-width: 740px;
  margin-bottom: 1.8rem;
}

.answer-field > span,
.confidence-field legend,
.retry-rating legend,
.return-options legend {
  margin-bottom: 0.75rem;
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 800;
}

.answer-field textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--ink);
  border-radius: 0;
  background:
    repeating-linear-gradient(transparent, transparent 2.05rem, color-mix(in srgb, var(--line) 70%, transparent) 2.05rem, color-mix(in srgb, var(--line) 70%, transparent) calc(2.05rem + 1px)),
    var(--surface);
  color: var(--ink);
  font-family: var(--display);
  font-size: 1rem;
  line-height: 2.05rem;
  padding: 1rem 1.15rem;
  box-shadow: 7px 7px 0 color-mix(in srgb, var(--burgundy) 90%, transparent);
}

.answer-field textarea::placeholder { color: color-mix(in srgb, var(--muted) 70%, transparent); }

.confidence-field,
.retry-rating,
.return-options,
.checklist {
  max-width: 740px;
  margin: 0 0 2rem;
  padding: 0;
  border: 0;
}

.confidence-field {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.confidence-field legend { width: 100%; }

.confidence-field label,
.retry-rating label {
  position: relative;
  cursor: pointer;
}

.confidence-field input,
.retry-rating input { position: absolute; opacity: 0; }

.confidence-field span,
.retry-rating span {
  display: grid;
  place-items: center;
  min-height: 42px;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 75%, transparent);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
}

.confidence-field input:checked + span,
.retry-rating input:checked + span {
  border-color: var(--burgundy);
  background: var(--burgundy);
  color: #fff;
}

.confidence-field input:focus-visible + span,
.retry-rating input:focus-visible + span,
.return-options input:focus-visible + span,
.checklist input:focus-visible + span {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.validation-message {
  margin: -0.65rem 0 1.2rem;
  color: var(--burgundy-deep);
  font-size: 0.78rem;
  font-weight: 800;
}

.attempt-copy {
  max-width: 740px;
  margin: 0 0 2rem;
  padding: 1.2rem 1.35rem;
  border-left: 5px solid var(--gold);
  background: color-mix(in srgb, var(--surface) 78%, transparent);
}

.attempt-copy span,
.comparison article > span {
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.64rem;
  font-style: normal;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.attempt-copy p {
  margin: 0.65rem 0 0;
  color: var(--ink);
  font-size: 0.95rem;
  font-style: normal;
  line-height: 1.6;
  white-space: pre-wrap;
}

.checklist label {
  display: grid;
  grid-template-columns: 1.4rem 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
  cursor: pointer;
}

.checklist label:last-child { border-bottom: 1px solid var(--line); }

.checklist input {
  width: 1.25rem;
  height: 1.25rem;
  margin: 0.1rem 0 0;
}

.checklist span {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
}

.checklist strong { color: var(--ink); }

.check-result {
  max-width: 740px;
  margin: -0.7rem 0 2rem;
  padding: 1rem 1.2rem;
  background: var(--gold);
  color: #211a16;
}

.check-result strong { font-size: 0.9rem; }
.check-result p { margin: 0.2rem 0 0; font-size: 0.75rem; }

.gap-list {
  max-width: 740px;
  margin: 0 0 2rem;
  border-block: 1px solid var(--line);
}

.gap-list article {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 1rem;
  padding: 1rem 0;
}

.gap-list article + article { border-top: 1px solid var(--line); }

.gap-list article > span {
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.65rem;
}

.gap-list strong { font-size: 0.9rem; }
.gap-list p { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.82rem; line-height: 1.5; }

.gap-list__success {
  margin: 0;
  padding: 1.1rem 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 780px;
  margin-bottom: 2rem;
  border: 1px solid var(--ink);
  background: var(--surface);
  box-shadow: 9px 9px 0 var(--burgundy);
}

.comparison article { padding: 1.4rem; }
.comparison article + article { border-left: 1px solid var(--line); }

.comparison p {
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.65;
  white-space: pre-wrap;
}

.comparison__model { background: color-mix(in srgb, var(--gold) 13%, var(--surface)); }

.retry-rating {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.retry-rating legend { width: 100%; }
.retry-rating span { width: 44px; padding-inline: 0.5rem; }

.return-options label {
  display: grid;
  grid-template-columns: 1.35rem 1fr;
  gap: 1rem;
  align-items: center;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  cursor: pointer;
}

.return-options label:last-child { border-bottom: 1px solid var(--line); }
.return-options input { width: 1.15rem; height: 1.15rem; margin: 0; }
.return-options label > span { display: grid; gap: 0.15rem; }
.return-options strong { font-size: 0.9rem; }
.return-options small { color: var(--muted); font-size: 0.73rem; }

.module-complete { max-width: 780px; }

.complete-mark {
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  margin-bottom: 1.5rem;
  border: 2px solid var(--burgundy);
  border-radius: 50%;
  color: var(--burgundy);
  font-family: var(--utility);
  font-size: 1.4rem;
  transform: rotate(-7deg);
}

.experiment-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 2.5rem 0;
  border-block: 1px solid var(--line);
}

.experiment-summary div { padding: 1.2rem 1.2rem 1.2rem 0; }
.experiment-summary div + div { padding-left: 1.2rem; border-left: 1px solid var(--line); }
.experiment-summary dt { color: var(--muted); font-family: var(--utility); font-size: 0.62rem; text-transform: uppercase; }
.experiment-summary dd { margin: 0.45rem 0 0; font-size: 0.92rem; font-weight: 800; }

.takeaway {
  padding: 1.25rem 1.4rem;
  border: 1px solid var(--ink);
  background: var(--surface);
  box-shadow: 7px 7px 0 var(--gold);
}

.takeaway p { margin: 0; color: var(--muted); font-size: 0.86rem; line-height: 1.55; }
.takeaway p + p { margin-top: 0.35rem; }
.takeaway strong { color: var(--ink); }

.complete-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.2rem; }

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

.project {
  position: relative;
  display: grid;
  grid-template-columns: 150px minmax(0, 760px) 1fr;
  gap: clamp(2rem, 5vw, 5rem);
  padding: clamp(4.5rem, 8vw, 7rem) max(1.5rem, calc((100vw - 1240px) / 2));
  overflow: hidden;
  background: var(--burgundy-deep);
  color: #fff8e5;
}

.project::after {
  position: absolute;
  right: -8vw;
  bottom: -16vw;
  width: 38vw;
  height: 38vw;
  border: 5vw solid var(--gold);
  border-radius: 50%;
  content: "";
  opacity: 0.13;
}

.section-label {
  margin: 0;
  font-family: var(--utility);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-label::before {
  display: block;
  width: 34px;
  height: 5px;
  margin-bottom: 0.8rem;
  background: var(--gold);
  content: "";
}

.project h2 {
  margin: 0 0 1.3rem;
  font-size: clamp(2.2rem, 5vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.065em;
}

.project div > p {
  max-width: 630px;
  margin: 0;
  color: #eed9d8;
  font-size: 1.05rem;
  line-height: 1.65;
}

.motto {
  align-self: end;
  justify-self: end;
  margin: 0;
  color: var(--gold-soft);
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2vw, 1.7rem);
  font-style: italic;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 4rem;
    min-height: auto;
  }

  .lab-card { transform: rotate(0.5deg); }

  .project { grid-template-columns: 1fr; }
  .motto { justify-self: start; }

  .module {
    grid-template-columns: 1fr;
    gap: 2.2rem;
  }

  .module-rail {
    position: static;
    overflow: hidden;
  }

  .module-progress {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    border-bottom: 1px solid var(--line);
  }

  .module-progress li {
    display: flex;
    justify-content: center;
    min-height: 38px;
    border-bottom: 0;
    font-size: 0;
  }

  .module-progress li span { font-size: 0.62rem; }
  .module-progress li.is-current { padding-left: 0; border-left: 0; border-bottom: 4px solid var(--gold); }
  .module-rail__time { margin-bottom: 0.8rem; }
  .module-rail__note { display: none; }
}

@media (max-width: 560px) {
  .site-header, .hero { width: min(100% - 2rem, 1240px); }
  .school-brand img { width: 44px; }
  .school-brand small { font-size: 0.56rem; }
  .theme-toggle { font-size: 0.62rem; }
  .hero { padding: 4rem 0 5rem; }
  .hero h1 { font-size: clamp(3.7rem, 19vw, 5.5rem); }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .lab-card { box-shadow: 8px 8px 0 var(--burgundy); }
  .lab-card__stamp { display: none; }

  .header-actions { gap: 0.5rem; }
  .header-back { display: none; }
  .module { width: min(100% - 2rem, 1180px); padding: 2.5rem 0 5rem; }
  .module-screen h1 { font-size: clamp(3rem, 15vw, 4.8rem); }
  .module-screen h2 { font-size: clamp(2.3rem, 11vw, 3.5rem); }
  .experiment-setup { grid-template-columns: 1fr; }
  .experiment-setup div { padding: 1rem 0; }
  .experiment-setup div + div { padding-left: 0; border-top: 1px solid var(--line); border-left: 0; }
  .module-action-row { align-items: flex-start; flex-direction: column; }
  .module-button { width: 100%; }
  .study-sheet { box-shadow: 7px 7px 0 var(--burgundy); }
  .study-timer { grid-template-columns: auto min-content auto; }
  .study-timer__track { grid-column: 1 / -1; }
  .confidence-field { display: grid; grid-template-columns: 1fr; }
  .comparison { grid-template-columns: 1fr; box-shadow: 7px 7px 0 var(--burgundy); }
  .comparison article + article { border-top: 1px solid var(--line); border-left: 0; }
  .experiment-summary { grid-template-columns: 1fr; }
  .experiment-summary div { padding: 0.9rem 0; }
  .experiment-summary div + div { padding-left: 0; border-top: 1px solid var(--line); border-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .module-screen { animation: none; }
}

/* ——— For families ——— */

.families {
  width: min(820px, calc(100% - 3rem));
  margin: 0 auto;
  padding: clamp(3.5rem, 7vw, 6rem) 0 7rem;
}

.families-hero {
  margin-bottom: clamp(3rem, 6vw, 5rem);
  padding-bottom: clamp(2.5rem, 5vw, 4.5rem);
  border-bottom: 1px solid var(--line);
}

.families-hero h1 {
  max-width: 720px;
  margin: 0.5rem 0 0;
  font-size: clamp(3rem, 8vw, 6.2rem);
  line-height: 0.9;
  letter-spacing: -0.07em;
}

.families-hero h1 em {
  color: var(--burgundy);
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.035em;
}

.families-link {
  display: inline-block;
  margin-top: 1.5rem;
  color: var(--muted);
  font-family: var(--utility);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-decoration: none;
  text-transform: uppercase;
}

.families-link:hover { color: var(--ink); }

.families-lead {
  max-width: 600px;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.8vw, 1.22rem);
  line-height: 1.65;
}

.families-section {
  margin-bottom: clamp(3.5rem, 7vw, 6rem);
}

.families-section__heading {
  max-width: 680px;
  margin: 0 0 2rem;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.0;
  letter-spacing: -0.055em;
}

/* Insight block */

.families-insight {
  padding: clamp(1.5rem, 3.5vw, 2.6rem);
  border: 1px solid var(--ink);
  background: color-mix(in srgb, var(--gold) 14%, var(--surface));
  box-shadow: 10px 10px 0 var(--burgundy);
}

.families-insight h2 {
  max-width: 640px;
  margin: 0.5rem 0 1.1rem;
  font-size: clamp(1.8rem, 4vw, 2.9rem);
  line-height: 1.03;
  letter-spacing: -0.055em;
}

.families-insight p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.families-insight p + p { margin-top: 0.9rem; }
.families-insight strong { color: var(--ink); }

/* Evidence grid */

.evidence-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.evidence-card {
  padding: clamp(1.2rem, 2.5vw, 1.8rem);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 5px 5px 0 var(--gold);
}

.evidence-card__icon {
  display: block;
  width: 28px;
  height: 28px;
  margin-bottom: 1rem;
  color: var(--burgundy);
}

.evidence-card__number {
  display: block;
  margin-bottom: 0.75rem;
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.evidence-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.08rem;
  line-height: 1.25;
  letter-spacing: -0.03em;
}

.evidence-card > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.87rem;
  line-height: 1.62;
}

/* Research details */

.evidence-ref {
  margin-top: 1.1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.evidence-ref summary {
  cursor: pointer;
  list-style: none;
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  user-select: none;
}

.evidence-ref summary::-webkit-details-marker { display: none; }
.evidence-ref summary::after { content: " ↓"; }
details.evidence-ref[open] > summary::after { content: " ↑"; }

.evidence-ref p {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.62;
}

/* Support list */

.support-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: support;
}

.support-list > li {
  display: grid;
  grid-template-columns: 2.3rem 1fr;
  gap: 0 1.5rem;
  align-items: start;
  padding: 1.75rem 0;
  border-top: 1px solid var(--line);
  counter-increment: support;
}

.support-list > li:last-child { border-bottom: 1px solid var(--line); }

.support-list > li::before {
  content: counter(support, decimal-leading-zero);
  padding-top: 0.2rem;
  color: var(--burgundy-deep);
  font-family: var(--utility);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.support-list strong {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 1.02rem;
  letter-spacing: -0.025em;
}

.support-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.62;
}

.support-list .evidence-ref { margin-top: 1rem; }

/* Questions block */

.questions-block {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 4vw, 3rem);
  border: 1px solid var(--ink);
  background: var(--burgundy);
  box-shadow: 10px 10px 0 var(--gold);
}

.questions-block::before {
  content: "\201C";
  position: absolute;
  top: -2.5rem;
  right: -1rem;
  font-family: var(--serif);
  font-size: 16rem;
  line-height: 1;
  color: color-mix(in srgb, #fff 10%, transparent);
  pointer-events: none;
  user-select: none;
}

.questions-block h2 {
  max-width: 560px;
  margin: 0 0 0.65rem;
  color: #fff;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.0;
  letter-spacing: -0.06em;
}

.families-sublead {
  max-width: 560px;
  margin: 0 0 1.75rem;
  color: color-mix(in srgb, #fff 78%, transparent);
  font-size: 0.88rem;
  line-height: 1.6;
}

.question-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid color-mix(in srgb, #fff 22%, transparent);
}

.question-list li {
  padding: 1rem 0;
  border-bottom: 1px solid color-mix(in srgb, #fff 22%, transparent);
  color: #fff;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.025em;
}

.question-list q { quotes: "\201C" "\201D"; }

/* Footer note */

.families-footer-note {
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.families-footer-note h2 {
  margin: 0 0 0.65rem;
  font-size: 0.92rem;
  font-weight: 800;
}

.families-footer-note > p {
  max-width: 640px;
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.62;
}

@media (max-width: 720px) {
  .evidence-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .families { padding-top: 2.5rem; }
  .support-list > li { grid-template-columns: 1.8rem 1fr; gap: 0 1rem; }
  .questions-block { box-shadow: 7px 7px 0 var(--gold); }
}