:root {
  --paper: #fbf7ef;
  --surface: #fffdf8;
  --paper-deep: #f6efe2;
  --ink: #1a2238;
  --ink-soft: #3d4660;
  --muted: #59627a;
  --accent: #b43e10;
  --rule: #e6dcc7;
  --rule-strong: #cfc1a8;
  --shadow: rgb(74 58 30 / 0.13);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius: 12px;
  --max: 1240px;
  --nav-height: 72px;
  color-scheme: light;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-width: 320px;
}

body {
  min-height: 100dvh;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
}

body.menu-open {
  overflow: hidden;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

button {
  color: inherit;
}

img,
video {
  display: block;
  max-width: 100%;
}

figure,
h1,
h2,
h3,
p,
ol,
ul {
  margin: 0;
}

ol,
ul {
  list-style: none;
  padding: 0;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 600;
}

.shell {
  width: min(calc(100% - 48px), var(--max));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  inset: 8px auto auto 8px;
  z-index: 100;
  transform: translateY(-160%);
  padding: 10px 14px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

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

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--rule);
  background: rgb(251 247 239 / 0.95);
  backdrop-filter: blur(12px);
}

.nav-inner {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
}

.brand-copy {
  display: grid;
  line-height: 1;
}

.brand-name {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
}

.brand-sub {
  margin-top: 5px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.nav-links,
.nav-main {
  display: flex;
  align-items: center;
}

.nav-links {
  gap: 30px;
}

.nav-main {
  gap: 26px;
}

.nav-links a {
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-signin {
  border-bottom: 1px solid currentColor;
  padding-block: 4px;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background: transparent;
  padding: 9px 12px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}

.eyebrow {
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.hero {
  min-height: calc(100svh - var(--nav-height));
  display: grid;
  grid-template-columns: minmax(390px, 0.82fr) minmax(0, 1.18fr);
  align-items: center;
  gap: 52px;
  padding-block: 46px 54px;
}

.hero-copy {
  display: grid;
  align-content: center;
  gap: 24px;
}

.hero h1 {
  max-width: 10ch;
  font-size: clamp(48px, 4.7vw, 68px);
  letter-spacing: -0.035em;
  line-height: 0.98;
}

.hero-lead {
  max-width: 54ch;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 140ms ease, background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}

.button:active {
  transform: translateY(1px);
}

.button-primary {
  background: var(--ink);
  color: var(--paper);
}

.button-primary:hover {
  background: var(--accent);
}

.button-secondary {
  border-color: var(--rule-strong);
  color: var(--ink);
}

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

.hero-visual {
  min-width: 0;
}

.product-frame {
  overflow: hidden;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 24px 70px var(--shadow);
}

.product-frame img {
  width: 100%;
  height: auto;
}

.fact-strip {
  border-block: 1px solid var(--rule);
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.fact {
  min-height: 102px;
  display: grid;
  align-content: center;
  gap: 5px;
  padding: 20px 28px;
  border-right: 1px solid var(--rule);
}

.fact:first-child {
  padding-left: 0;
}

.fact:last-child {
  border-right: 0;
}

.fact strong {
  font-family: var(--serif);
  font-size: 26px;
  font-weight: 600;
}

.fact span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding-block: 116px;
}

.section-heading {
  max-width: 760px;
  display: grid;
  gap: 17px;
  margin-bottom: 52px;
}

.section-heading h2,
.parent-copy h2,
.final-cta h2 {
  letter-spacing: -0.025em;
  line-height: 1.06;
}

.section-heading h2,
.parent-copy h2 {
  font-size: clamp(38px, 4vw, 58px);
}

.section-heading > p:not(.eyebrow),
.parent-copy > p,
.final-meta > p {
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.65;
}

.showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.58fr) minmax(280px, 0.82fr);
  gap: 28px 24px;
}

.showcase-main {
  grid-row: span 2;
}

.showcase figure {
  min-width: 0;
}

.replay-media {
  position: relative;
  box-shadow: 0 18px 45px var(--shadow);
}

.replay-video {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #111827;
}

.showcase figcaption {
  display: grid;
  gap: 8px;
  padding-top: 16px;
}

.showcase h3 {
  font-size: 23px;
  line-height: 1.2;
}

.showcase figcaption > p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.showcase-side h3 {
  font-size: 20px;
}

.replay-transcript {
  margin-top: 3px;
  border-top: 1px solid var(--rule);
  padding-top: 9px;
  color: var(--ink-soft);
  font-size: 13px;
}

.replay-transcript summary {
  width: fit-content;
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
}

.replay-transcript p {
  margin-top: 8px;
  line-height: 1.6;
}

.parent-section,
.subjects-section {
  width: 100%;
  background: var(--paper-deep);
  border-block: 1px solid var(--rule);
}

.parent-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 10vw;
  align-items: start;
}

.parent-copy {
  position: sticky;
  top: 116px;
  display: grid;
  gap: 24px;
}

.parent-points {
  border-top: 1px solid var(--rule-strong);
}

.parent-point {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 28px;
  padding-block: 30px;
  border-bottom: 1px solid var(--rule);
}

.parent-point h3 {
  font-size: 25px;
  line-height: 1.18;
}

.parent-point p {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.65;
}

.learning-loop {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--rule-strong);
}

.loop-item {
  min-height: 230px;
  padding: 32px 28px 24px 0;
  border-right: 1px solid var(--rule);
}

.loop-item + .loop-item {
  padding-left: 28px;
}

.loop-item:last-child {
  border-right: 0;
}

.loop-item h3 {
  font-size: 29px;
}

.loop-item p {
  margin-top: 17px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.65;
}

.loop-item strong {
  color: var(--accent);
  font-weight: 600;
}

.subject-register {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--rule-strong);
}

.subject-item {
  min-height: 182px;
  display: grid;
  align-content: space-between;
  padding: 28px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.subject-item:first-child {
  padding-left: 0;
}

.subject-item:last-child {
  border-right: 0;
}

.subject-glyph {
  color: var(--accent);
  font-family: var(--serif);
  font-size: 32px;
}

.subject-item h3 {
  font-size: 25px;
}

.subject-status {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
}

.subject-note {
  max-width: 72ch;
  margin-top: 20px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial {
  border-top: 2px solid var(--accent);
  padding-top: 18px;
}

.testimonial blockquote {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.45;
}

.testimonial footer {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
}

.final-wrap {
  padding-block: 0 116px;
}

.final-cta {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 48px;
  align-items: end;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 64px;
}

.final-cta h2 {
  max-width: 16ch;
  font-size: clamp(38px, 4.5vw, 62px);
}

.final-meta {
  display: grid;
  justify-items: start;
  gap: 24px;
}

.site-footer {
  border-top: 1px solid var(--rule);
}

.footer-inner {
  min-height: 138px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 32px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 22px;
  color: var(--muted);
  font-size: 12px;
}

.footer-note {
  margin-top: 9px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 1050px) {
  .hero {
    grid-template-columns: minmax(340px, 0.82fr) minmax(0, 1.18fr);
    gap: 36px;
  }

  .hero h1 {
    font-size: clamp(44px, 5.5vw, 60px);
  }

  .parent-layout {
    gap: 6vw;
  }
}

@media (max-width: 960px) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-block: 70px;
  }

  .hero h1 {
    max-width: 12ch;
  }

  .hero-visual {
    max-width: 780px;
  }

  .showcase {
    grid-template-columns: 1fr;
  }

  .showcase-main {
    grid-row: auto;
  }

  .parent-layout {
    grid-template-columns: 1fr;
    gap: 54px;
  }

  .parent-copy {
    position: static;
  }

  .learning-loop,
  .subject-register {
    grid-template-columns: repeat(2, 1fr);
  }

  .loop-item:nth-child(2),
  .subject-item:nth-child(2) {
    border-right: 0;
  }

  .loop-item:nth-child(3),
  .loop-item:nth-child(4) {
    border-top: 1px solid var(--rule);
  }

  .loop-item:nth-child(3) {
    padding-left: 0;
  }

  .subject-item:nth-child(3) {
    padding-left: 0;
  }

  .final-cta {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

@media (max-width: 799px) {
  .shell {
    width: min(calc(100% - 32px), var(--max));
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    inset: var(--nav-height) 16px auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    border: 1px solid var(--rule-strong);
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: 0 18px 45px var(--shadow);
    padding: 20px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-main {
    display: grid;
    gap: 4px;
  }

  .nav-links a {
    min-height: 44px;
    display: flex;
    align-items: center;
    padding-inline: 10px;
  }

  .nav-signin {
    border-top: 1px solid var(--rule);
    border-bottom: 0;
  }

  .facts {
    grid-template-columns: 1fr;
  }

  .fact,
  .fact:first-child {
    min-height: 92px;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
    padding-inline: 0;
  }

  .fact:last-child {
    border-bottom: 0;
  }

  .section {
    padding-block: 84px;
  }

  .section-heading {
    margin-bottom: 40px;
  }

  .parent-point {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .final-wrap {
    padding-bottom: 84px;
  }

  .final-cta {
    padding: 42px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    padding-block: 30px;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 600px) {
  .hero {
    gap: 44px;
    padding-block: 58px;
  }

  .hero h1 {
    font-size: 46px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    align-items: stretch;
  }

  .hero-actions .button {
    flex: 1 1 100%;
  }

  .section-heading h2,
  .parent-copy h2 {
    font-size: 38px;
  }

  .learning-loop,
  .subject-register,
  .testimonial-grid {
    grid-template-columns: 1fr;
  }

  .loop-item,
  .loop-item + .loop-item {
    min-height: auto;
    border-right: 0;
    border-top: 1px solid var(--rule);
    padding: 26px 0;
  }

  .loop-item:first-child {
    border-top: 0;
  }

  .subject-item,
  .subject-item:first-child,
  .subject-item:nth-child(3) {
    min-height: 142px;
    border-right: 0;
    padding: 24px 0;
  }

  .final-cta {
    gap: 30px;
    padding: 30px 24px;
  }

  .final-cta h2 {
    font-size: 38px;
  }
}

@media (max-height: 760px) and (min-width: 961px) {
  .hero {
    min-height: auto;
    padding-block: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  :root {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}