:root {
  --ink: #0b1020;
  --ink-2: #151d33;
  --paper: #f4f0e6;
  --paper-2: #e9e4d8;
  --white: #fffdf7;
  --cobalt: #2457ff;
  --cyan: #a7eef5;
  --coral: #ff5b3a;
  --yellow: #ffd84a;
  --sage: #b9d4bd;
  --muted: #686c75;
  --line: rgba(11, 16, 32, 0.2);
  --line-light: rgba(255, 253, 247, 0.18);
  --display: "Newsreader", Georgia, serif;
  --body: "DM Sans", sans-serif;
  --mono: "DM Mono", monospace;
  --shadow: 12px 12px 0 var(--ink);
}
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.55;
}

body::selection {
  color: var(--white);
  background: var(--cobalt);
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

a {
  color: inherit;
}

.page-noise {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.7'/%3E%3C/svg%3E");
}

.shell {
  width: min(1240px, calc(100vw - 48px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 240, 230, 0.88);
  backdrop-filter: blur(18px);
}

.nav-shell {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.84rem;
  font-weight: 500;
  letter-spacing: -0.035em;
}

.brand-dot {
  color: var(--coral);
}

.brand-symbol {
  position: relative;
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  transition: transform 0.35s ease;
}

.brand:hover .brand-symbol {
  transform: rotate(-12deg) scale(1.06);
}

.brand-symbol i {
  position: absolute;
  display: block;
  width: 15px;
  height: 2px;
  background: var(--white);
  transform-origin: left center;
}

.brand-symbol i:first-child { transform: translateY(-5px) rotate(14deg); }
.brand-symbol i:nth-child(2) { width: 18px; }
.brand-symbol i:last-child { transform: translateY(5px) rotate(-14deg); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 650;
}

.site-nav > a:not(.nav-cta) {
  position: relative;
}

.site-nav > a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -7px;
  height: 2px;
  background: var(--coral);
  transition: right 0.2s ease;
}

.site-nav > a:not(.nav-cta):hover::after {
  right: 0;
}

.nav-cta {
  min-height: 40px;
  padding: 0 15px;
  display: inline-flex;
  align-items: center;
  gap: 20px;
  background: var(--ink);
  color: var(--white);
}

.nav-cta:hover {
  background: var(--cobalt);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--ink);
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  min-height: calc(100vh - 70px);
  padding-block: clamp(72px, 8vw, 118px) clamp(88px, 9vw, 132px);
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(560px, 1.16fr);
  align-items: center;
  gap: clamp(52px, 6vw, 96px);
}

.status-line,
.eyebrow,
.step-label,
.board-label,
.stage-caption {
  font-family: var(--mono);
  font-size: 0.67rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.status-line {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 25px;
  color: var(--muted);
}

.status-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 5px rgba(255, 91, 58, 0.13);
  animation: pulse 2s ease-in-out infinite;
}

.status-divider {
  width: 18px;
  height: 1px;
  background: var(--line);
}

@keyframes pulse {
  50% { box-shadow: 0 0 0 9px rgba(255, 91, 58, 0); }
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  margin-bottom: 0;
  font-family: var(--display);
  font-weight: 450;
  letter-spacing: -0.055em;
}

h1 {
  max-width: 11ch;
  font-size: clamp(4.1rem, 6.4vw, 7rem);
  line-height: 0.88;
}

h1 em {
  display: inline-block;
  margin-top: 0.1em;
  color: var(--cobalt);
  font-weight: 450;
}

.hero-lede {
  max-width: 54ch;
  margin: 32px 0 0;
  color: #3c4250;
  font-size: clamp(1rem, 1.35vw, 1.16rem);
  line-height: 1.65;
}

.hero-actions {
  margin-top: 31px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 25px;
}

.button {
  min-height: 52px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  border: 1px solid var(--ink);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.button:hover {
  transform: translate(-4px, -4px);
  box-shadow: 6px 6px 0 var(--ink);
}

.button-primary {
  background: var(--cobalt);
  color: var(--white);
}

.button-light {
  background: var(--white);
  color: var(--ink);
}

.button-large {
  min-height: 60px;
  padding-inline: 22px;
}

.text-link {
  text-underline-offset: 5px;
  font-size: 0.8rem;
  font-weight: 700;
}

.text-link span {
  margin-left: 8px;
  color: var(--coral);
}

.focus-line {
  margin: 44px 0 0;
  color: var(--muted);
  font-size: 0.77rem;
  font-weight: 650;
}

.focus-line span {
  margin-right: 15px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
}

.focus-line i {
  margin-inline: 7px;
  color: var(--coral);
  font-style: normal;
}

.hero-stage {
  position: relative;
  min-height: 700px;
  padding-top: 68px;
}

.course-window {
  position: relative;
  z-index: 2;
  width: calc(100% - 28px);
  min-height: 530px;
  margin-left: auto;
  overflow: hidden;
  border: 1px solid var(--ink);
  background: var(--white);
  box-shadow: var(--shadow);
  transform: rotate(0.35deg);
}

.window-bar {
  min-height: 43px;
  padding: 0 13px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: 1px solid var(--ink);
  background: var(--paper-2);
  font-family: var(--mono);
  font-size: 0.56rem;
}

.traffic-lights {
  display: flex;
  gap: 5px;
}

.traffic-lights i {
  width: 8px;
  height: 8px;
  border: 1px solid var(--ink);
  border-radius: 50%;
}

.traffic-lights i:first-child { background: var(--coral); }
.traffic-lights i:nth-child(2) { background: var(--yellow); }
.traffic-lights i:last-child { background: var(--cyan); }

.private-label {
  justify-self: end;
  padding: 3px 6px;
  border: 1px solid var(--line);
  color: var(--muted);
}

.window-content {
  min-height: 486px;
  display: grid;
  grid-template-columns: 178px 1fr;
}

.lesson-rail {
  padding: 27px 14px;
  border-right: 1px solid var(--ink);
  background: #e6e9ef;
}

.rail-label {
  margin-bottom: 17px;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.09em;
}

.lesson-rail ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.lesson-rail li {
  min-height: 66px;
  padding-block: 10px;
  display: grid;
  grid-template-columns: 22px 1fr auto;
  gap: 6px;
  align-items: start;
  border-top: 1px solid var(--line);
  font-size: 0.63rem;
  font-weight: 700;
}

.lesson-rail li > span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.52rem;
}

.lesson-rail li small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.54rem;
  font-weight: 500;
  line-height: 1.35;
}

.lesson-rail li.active {
  margin-inline: -15px;
  padding-inline: 14px;
  border-color: var(--ink);
  background: var(--cyan);
}

.lesson-rail li.complete b {
  color: #277345;
}

.lesson-page {
  position: relative;
  padding: 32px clamp(22px, 3.2vw, 42px) 38px;
}

.lesson-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.52rem;
  letter-spacing: 0.06em;
}

.lesson-page h2 {
  max-width: 11ch;
  margin-top: 20px;
  font-size: clamp(2.3rem, 3.6vw, 3.7rem);
  line-height: 0.95;
}

.lesson-page h2 em {
  color: var(--cobalt);
  font-weight: 450;
}

.lesson-page > p {
  max-width: 47ch;
  margin: 18px 0 0;
  color: var(--muted);
  font-family: var(--display);
  font-size: 1rem;
  line-height: 1.45;
}

.noise-sequence {
  margin-top: 25px;
  padding: 19px;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.noise-sequence > i {
  color: var(--coral);
  font-style: normal;
}

.noise-frame {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border: 1px solid var(--ink);
  background-color: #92e9ee;
  background-image:
    radial-gradient(circle at 28% 30%, var(--cobalt) 0 14%, transparent 15%),
    radial-gradient(circle at 68% 65%, var(--coral) 0 12%, transparent 13%),
    linear-gradient(145deg, transparent 42%, var(--ink) 43% 48%, transparent 49%);
}

.noise-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: var(--noise-opacity, 0.1);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 90 90' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.72' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.noise-frame span {
  position: absolute;
  left: 5px;
  bottom: 3px;
  z-index: 1;
  padding: 1px 4px;
  background: var(--white);
  font-family: var(--mono);
  font-size: 0.48rem;
}

.frame-two { --noise-opacity: 0.48; filter: saturate(0.7); }
.frame-three { --noise-opacity: 0.82; filter: grayscale(0.65); }

.confusion-chip {
  width: 100%;
  margin-top: 20px;
  padding: 11px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--ink);
  background: var(--white);
  text-align: left;
  font-size: 0.67rem;
  font-weight: 650;
}

.confusion-chip span {
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--coral);
  color: var(--white);
  font-family: var(--mono);
}

.source-note,
.adaptation-card {
  position: absolute;
  z-index: 4;
  border: 1px solid var(--ink);
  box-shadow: 7px 7px 0 var(--ink);
}

.source-note {
  top: 0;
  left: -25px;
  width: 230px;
  padding: 15px;
  background: var(--yellow);
  transform: rotate(-3.5deg);
}

.note-type {
  display: inline-block;
  margin-bottom: 9px;
  padding: 2px 5px;
  border: 1px solid var(--ink);
  font-family: var(--mono);
  font-size: 0.5rem;
}

.source-note strong {
  display: block;
  font-family: var(--display);
  font-size: 1.05rem;
  line-height: 1.08;
}

.source-note small {
  display: block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 0.47rem;
}

.adaptation-card {
  right: -24px;
  bottom: 26px;
  width: min(390px, 72%);
  padding: 17px;
  background: var(--cobalt);
  color: var(--white);
  transform: rotate(-1.2deg);
}

.adaptation-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.adapt-icon {
  width: 37px;
  height: 37px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid var(--white);
  border-radius: 50%;
  font-size: 1.1rem;
}

.adaptation-head small,
.adaptation-head strong {
  display: block;
}

.adaptation-head small {
  margin-bottom: 2px;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.5rem;
  letter-spacing: 0.08em;
}

.adaptation-head strong {
  font-family: var(--display);
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.15;
}

.adaptation-card p {
  margin: 13px 0;
  padding-block: 11px;
  border-block: 1px solid var(--line-light);
  font-size: 0.66rem;
  line-height: 1.45;
}

.adaptation-card p span {
  margin-right: 7px;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.5rem;
}

.adaptation-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 7px;
  font-family: var(--mono);
  font-size: 0.53rem;
}

.adaptation-actions span,
.adaptation-actions b {
  padding: 5px 7px;
  border: 1px solid var(--line-light);
}

.adaptation-actions b {
  background: var(--white);
  color: var(--ink);
}

.stage-caption {
  position: absolute;
  left: 34px;
  bottom: 12px;
  color: var(--muted);
  font-size: 0.51rem;
}

.difference-section {
  padding-block: clamp(90px, 10vw, 150px);
  color: var(--white);
  background: var(--ink);
}

.difference-grid {
  display: grid;
  grid-template-columns: 180px 1fr minmax(220px, 0.36fr);
  align-items: end;
  gap: 40px;
}

.difference-section .eyebrow {
  align-self: start;
  color: var(--cyan);
}

.difference-copy p {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(3.1rem, 6vw, 6.4rem);
  letter-spacing: -0.055em;
  line-height: 0.9;
}

.difference-copy .difference-accent {
  margin-top: 0.2em;
  color: var(--coral);
}

.difference-note {
  margin: 0;
  color: #bec4d0;
  font-size: 0.86rem;
  line-height: 1.65;
}

.loop-section,
.workspace-section,
.trust-section,
.faq-section {
  padding-block: clamp(100px, 11vw, 165px);
}

.section-intro {
  display: grid;
  grid-template-columns: 170px minmax(300px, 1fr) minmax(250px, 0.55fr);
  gap: 35px;
  align-items: end;
}

.section-intro .eyebrow,
.workspace-head .eyebrow,
.subjects-copy .eyebrow,
.faq-heading .eyebrow {
  color: var(--cobalt);
}

.section-intro h2,
.workspace-head h2,
.subjects-copy h2,
.status-copy h2,
.faq-heading h2,
.final-copy h2,
.demo-copy h2 {
  font-size: clamp(3.2rem, 5.4vw, 5.8rem);
  line-height: 0.92;
}

.section-intro > p:last-child,
.workspace-head > p,
.demo-copy > p,
.status-copy > p,
.final-copy > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.loop-track {
  position: relative;
  margin-top: 76px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-block: 1px solid var(--ink);
}

.loop-track::before {
  content: "";
  position: absolute;
  top: 63px;
  left: 12.5%;
  right: 12.5%;
  height: 1px;
  background: var(--ink);
}

.loop-step {
  position: relative;
  min-height: 390px;
  padding: 22px 23px 34px;
  border-right: 1px solid var(--ink);
}

.loop-step:last-child {
  border-right: 0;
  background: var(--cyan);
}

.step-number {
  display: block;
  font-family: var(--mono);
  font-size: 0.58rem;
}

.step-mark {
  position: relative;
  z-index: 1;
  width: 72px;
  height: 72px;
  margin: 18px 0 34px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
}

.capture-mark i {
  width: 28px;
  height: 28px;
  border: 2px solid var(--cobalt);
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
}

.diagnose-mark {
  gap: 4px;
  align-content: center;
}

.diagnose-mark i {
  width: 32px;
  height: 3px;
  background: var(--ink);
}

.diagnose-mark i:first-child { width: 18px; margin-right: 14px; }
.diagnose-mark i:last-child { width: 23px; margin-left: 9px; }

.teach-mark {
  display: flex;
  align-items: end;
  justify-content: center;
  gap: 3px;
}

.teach-mark i {
  width: 7px;
  height: 22px;
  background: var(--coral);
}

.teach-mark i:nth-child(2) { height: 31px; background: var(--cobalt); }
.teach-mark i:last-child { height: 16px; background: var(--yellow); }

.adapt-mark {
  background: var(--cobalt);
  color: var(--white);
  font-size: 2rem;
}

.step-label {
  margin-bottom: 11px;
  color: var(--cobalt);
}

.loop-step:last-child .step-label {
  color: var(--ink);
}

.loop-step h3 {
  margin-bottom: 12px;
  font-family: var(--display);
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.02;
}

.loop-step > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.6;
}

.adapt-demo-section {
  padding-block: clamp(100px, 11vw, 160px);
  background: #dce2ea;
}

.adapt-demo-grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.68fr) minmax(540px, 1.32fr);
  align-items: center;
  gap: clamp(65px, 9vw, 130px);
}

.demo-copy .eyebrow {
  color: var(--cobalt);
}

.demo-copy h2 {
  margin: 17px 0 24px;
}

.signal-tabs {
  margin-top: 34px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}

.signal-tab {
  min-height: 50px;
  padding: 0 15px;
  border: 1px solid var(--ink);
  background: transparent;
  text-align: left;
  font-family: var(--mono);
  font-size: 0.65rem;
  cursor: pointer;
}

.signal-tab::before {
  content: "○";
  margin-right: 10px;
}

.signal-tab:hover,
.signal-tab.active {
  background: var(--ink);
  color: var(--white);
}

.signal-tab.active::before {
  content: "●";
  color: var(--coral);
}

.change-receipt {
  border: 1px solid var(--ink);
  background: var(--white);
  box-shadow: 14px 14px 0 var(--ink);
}

.receipt-top {
  min-height: 46px;
  padding: 0 17px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--ink);
  background: var(--paper-2);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.receipt-status {
  padding: 3px 6px;
  background: var(--yellow);
  border: 1px solid var(--ink);
}

.receipt-status.accepted {
  background: var(--cyan);
}

.receipt-status.rejected {
  background: var(--paper-2);
}

.receipt-row {
  min-height: 88px;
  padding: 17px 20px;
  display: grid;
  grid-template-columns: 82px 1fr;
  align-items: center;
  gap: 15px;
  border-block: 1px solid var(--line);
}

.receipt-key {
  color: var(--cobalt);
  font-family: var(--mono);
  font-size: 0.57rem;
  letter-spacing: 0.08em;
}

.receipt-row strong,
.receipt-row small {
  display: block;
}

.receipt-row strong {
  font-family: var(--display);
  font-size: 1.18rem;
  font-weight: 500;
  line-height: 1.2;
}

.receipt-row small {
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.62rem;
}

.receipt-signal {
  background: #fff6cc;
}

.receipt-change {
  background: var(--cyan);
}

.diff-preview {
  padding: 13px 20px 13px 117px;
  border-top: 1px dashed var(--ink);
  background: #eef6f1;
  font-family: var(--mono);
  font-size: 0.56rem;
}

.diff-preview[hidden] {
  display: none;
}

.diff-line {
  display: block;
  padding-block: 3px;
}

.diff-remove {
  color: #9a3e34;
  text-decoration: line-through;
}

.diff-add {
  color: #23663b;
}

.receipt-connector {
  height: 30px;
  padding-left: 46px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.receipt-connector span {
  color: var(--coral);
}

.receipt-connector small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.51rem;
}

.receipt-actions {
  padding: 16px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.receipt-actions button {
  min-height: 36px;
  padding: 0 11px;
  border: 1px solid var(--ink);
  background: transparent;
  font-family: var(--mono);
  font-size: 0.55rem;
  cursor: pointer;
}

.receipt-actions button:hover {
  background: var(--paper-2);
}

.receipt-actions .accept-button {
  background: var(--cobalt);
  color: var(--white);
}

.workspace-head {
  display: grid;
  grid-template-columns: 1.35fr 0.55fr;
  align-items: end;
  gap: 80px;
}

.workspace-head h2 {
  margin-top: 15px;
}

.workspace-board {
  margin-top: 70px;
  padding: 36px;
  display: grid;
  grid-template-columns: minmax(280px, 0.8fr) 100px minmax(390px, 1.2fr);
  align-items: center;
  gap: 30px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
}

.board-label {
  margin-bottom: 18px;
  color: var(--cyan);
}

.source-card {
  min-height: 67px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--line-light);
}

.source-card:last-child {
  border-bottom: 1px solid var(--line-light);
}

.source-icon {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid var(--white);
  font-family: var(--mono);
  font-size: 0.48rem;
}

.youtube-icon { background: var(--coral); }
.pdf-icon { background: var(--cobalt); }
.web-icon { background: var(--yellow); color: var(--ink); }
.note-icon { background: var(--cyan); color: var(--ink); }

.source-card strong,
.source-card small {
  display: block;
}

.source-card strong {
  font-size: 0.75rem;
}

.source-card small {
  margin-top: 2px;
  color: #9da6b8;
  font-size: 0.61rem;
}

.workspace-arrow {
  display: grid;
  justify-items: center;
  gap: 5px;
  color: var(--coral);
}

.workspace-arrow span {
  font-size: 2.6rem;
}

.workspace-arrow small {
  color: #9da6b8;
  font-family: var(--mono);
  font-size: 0.5rem;
  line-height: 1.5;
  text-align: center;
}

.workspace-output {
  padding: 25px;
  border: 1px solid var(--white);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 9px 9px 0 var(--cobalt);
}

.project-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.06em;
}

.workspace-output h3 {
  max-width: 14ch;
  margin: 23px 0 27px;
  font-family: var(--display);
  font-size: 2.25rem;
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 0.96;
}

.project-goal,
.project-proof,
.project-next {
  min-height: 58px;
  padding-block: 12px;
  display: grid;
  grid-template-columns: 64px 1fr auto;
  align-items: center;
  gap: 10px;
  border-top: 1px solid var(--line);
}

.project-goal > span,
.project-proof > span,
.project-next > span {
  color: var(--cobalt);
  font-family: var(--mono);
  font-size: 0.5rem;
}

.project-goal p,
.project-proof p,
.project-next p {
  margin: 0;
  font-size: 0.67rem;
  line-height: 1.45;
}

.project-next {
  margin: 8px -14px -14px;
  padding-inline: 14px;
  background: var(--cyan);
  border: 1px solid var(--ink);
}

.subjects-section {
  padding-block: clamp(100px, 11vw, 165px);
  background: #ece1d2;
}

.subjects-grid {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: clamp(75px, 10vw, 150px);
}

.subjects-copy h2 {
  margin-top: 20px;
  font-size: clamp(2.8rem, 4.8vw, 5rem);
  line-height: 0.95;
}

.subject-list {
  border-top: 1px solid var(--ink);
}

.subject-row {
  min-height: 126px;
  display: grid;
  grid-template-columns: 45px 1fr 1.2fr auto;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--ink);
}

.subject-row > span {
  font-family: var(--mono);
  font-size: 0.58rem;
}

.subject-row h3 {
  margin: 0;
  font-family: var(--display);
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: -0.035em;
}

.subject-row p {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
}

.subject-row b {
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  color: var(--cobalt);
}

.trust-grid {
  margin-top: 70px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-block: 1px solid var(--ink);
}

.trust-card {
  min-height: 280px;
  padding: 23px;
  border-right: 1px solid var(--ink);
}

.trust-card:last-child {
  border-right: 0;
}

.trust-card > span {
  font-family: var(--mono);
  font-size: 0.56rem;
}

.trust-card h3 {
  margin: 95px 0 12px;
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: -0.03em;
}

.trust-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.6;
}

.trust-card:nth-child(2) { background: var(--yellow); }
.trust-card:nth-child(3) { background: var(--cyan); }

.status-section {
  padding-block: clamp(100px, 11vw, 155px);
  color: var(--white);
  background: var(--cobalt);
}

.status-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: clamp(65px, 9vw, 130px);
}

.status-copy .eyebrow {
  color: var(--cyan);
}

.status-copy h2 {
  margin: 20px 0 25px;
}

.status-copy > p {
  color: #dfe5ff;
}

.status-copy .button {
  margin-top: 32px;
}

.capability-list {
  border-top: 1px solid var(--line-light);
}

.capability-list > div {
  min-height: 125px;
  padding: 26px 0;
  display: grid;
  grid-template-columns: 20px 180px 1fr;
  align-items: start;
  gap: 12px;
  border-bottom: 1px solid var(--line-light);
}

.cap-dot {
  width: 9px;
  height: 9px;
  margin-top: 6px;
  border: 1px solid var(--white);
  border-radius: 50%;
}

.cap-dot.foundation { background: var(--cyan); }
.cap-dot.building { background: var(--yellow); }
.cap-dot.later { background: transparent; }

.capability-list strong {
  font-family: var(--display);
  font-size: 1.1rem;
  font-weight: 500;
}

.capability-list p {
  margin: 0;
  color: #dfe5ff;
  font-size: 0.74rem;
}

.faq-section {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: clamp(70px, 10vw, 150px);
}

.faq-heading h2 {
  margin-top: 20px;
}

.faq-list {
  border-top: 1px solid var(--ink);
}

.faq-list details {
  border-bottom: 1px solid var(--ink);
}

.faq-list summary {
  min-height: 84px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  cursor: pointer;
  list-style: none;
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 500;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary span {
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border: 1px solid var(--ink);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.8rem;
  transition: transform 0.2s ease, background 0.2s ease;
}

.faq-list details[open] summary span {
  transform: rotate(45deg);
  background: var(--coral);
  color: var(--white);
}

.faq-list details p {
  max-width: 66ch;
  margin: -3px 55px 27px 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.7;
}

.final-cta {
  padding-block: clamp(100px, 11vw, 155px);
  color: var(--white);
  background: var(--ink);
}

.final-cta-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  align-items: center;
  gap: clamp(75px, 11vw, 160px);
}

.final-orbit {
  position: relative;
  aspect-ratio: 1;
  max-width: 430px;
  display: grid;
  place-items: center;
}

.orbit-ring {
  position: absolute;
  border: 1px solid var(--line-light);
  border-radius: 50%;
}

.orbit-ring-one {
  inset: 5%;
  animation: spin 24s linear infinite;
}

.orbit-ring-one::before,
.orbit-ring-two::before {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  top: 14%;
  left: 14%;
  border-radius: 50%;
  background: var(--coral);
}

.orbit-ring-two {
  inset: 23%;
  border-style: dashed;
  animation: spin 17s linear reverse infinite;
}

.orbit-ring-two::before {
  top: auto;
  left: auto;
  right: -6px;
  bottom: 48%;
  background: var(--cyan);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.orbit-core {
  position: relative;
  z-index: 1;
  width: 135px;
  height: 135px;
  display: grid;
  place-items: center;
  align-content: center;
  border: 1px solid var(--white);
  border-radius: 50%;
  background: var(--cobalt);
}

.orbit-core span {
  font-family: var(--display);
  font-size: 3.3rem;
  line-height: 0.8;
}

.orbit-core small {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 0.48rem;
  line-height: 1.4;
  text-align: center;
  text-transform: uppercase;
}

.orbit-label {
  position: absolute;
  z-index: 2;
  padding: 5px 8px;
  border: 1px solid var(--white);
  background: var(--ink);
  font-family: var(--mono);
  font-size: 0.52rem;
}

.label-capture { left: 0; top: 48%; }
.label-adapt { right: 2%; top: 22%; color: var(--cyan); }
.label-verify { right: 11%; bottom: 10%; color: var(--yellow); }

.final-copy .eyebrow {
  color: var(--cyan);
}

.final-copy h2 {
  margin: 19px 0 25px;
}

.final-copy > p {
  max-width: 48ch;
  color: #bfc6d4;
}

.final-copy .button {
  margin-top: 31px;
  border-color: var(--white);
}

.final-copy > small {
  display: block;
  margin-top: 17px;
  color: #7f8797;
  font-size: 0.64rem;
}

.site-footer {
  padding-block: 34px;
  border-top: 1px solid var(--line-light);
  color: var(--white);
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  align-items: center;
  gap: 30px;
}

.footer-grid p {
  margin: 0;
  color: #7f8797;
  font-size: 0.69rem;
  text-align: center;
}

.footer-grid > div {
  display: flex;
  justify-content: flex-end;
  gap: 20px;
}

.footer-grid > div a {
  font-size: 0.67rem;
  text-underline-offset: 4px;
}

.motion-ready .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.motion-ready .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
  .motion-ready .reveal { opacity: 1; transform: none; transition: none; }
}

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 760px;
  }

  h1 {
    max-width: 12ch;
  }

  .hero-stage {
    width: min(760px, 100%);
    margin-inline: auto;
  }

  .difference-grid {
    grid-template-columns: 140px 1fr;
  }

  .difference-note {
    grid-column: 2;
    max-width: 55ch;
  }

  .section-intro {
    grid-template-columns: 130px 1fr;
  }

  .section-intro > p:last-child {
    grid-column: 2;
  }

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

  .loop-track::before {
    display: none;
  }

  .loop-step:nth-child(2) {
    border-right: 0;
  }

  .loop-step:nth-child(-n + 2) {
    border-bottom: 1px solid var(--ink);
  }

  .adapt-demo-grid {
    grid-template-columns: 1fr;
  }

  .signal-tabs {
    flex-direction: row;
  }

  .signal-tab {
    flex: 1;
  }

  .workspace-board {
    grid-template-columns: 0.8fr 70px 1.2fr;
    padding: 26px;
    gap: 20px;
  }

  .subjects-grid,
  .status-grid,
  .faq-section,
  .final-cta-grid {
    grid-template-columns: 1fr 1fr;
    gap: 65px;
  }
}

@media (max-width: 780px) {
  .shell {
    width: min(100% - 32px, 620px);
  }

  .site-nav {
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    display: none;
    padding: 18px 16px 23px;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--ink);
    background: var(--paper);
  }

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

  .site-nav > a {
    min-height: 48px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--line);
  }

  .site-nav .nav-cta {
    margin-top: 10px;
    padding-inline: 14px;
    justify-content: space-between;
  }

  .menu-toggle {
    display: block;
  }

  .hero {
    padding-top: 62px;
  }

  h1 {
    font-size: clamp(3.55rem, 16vw, 5.4rem);
  }

  .hero-stage {
    min-height: 655px;
    padding-top: 74px;
  }

  .source-note {
    left: -3px;
  }

  .course-window {
    width: 100%;
    margin-left: 0;
  }

  .window-content {
    grid-template-columns: 1fr;
  }

  .lesson-rail {
    display: none;
  }

  .adaptation-card {
    right: -3px;
    bottom: 5px;
    width: min(390px, 86%);
  }

  .stage-caption {
    display: none;
  }

  .difference-grid,
  .section-intro,
  .workspace-head,
  .subjects-grid,
  .status-grid,
  .faq-section,
  .final-cta-grid {
    grid-template-columns: 1fr;
  }

  .difference-note,
  .section-intro > p:last-child {
    grid-column: 1;
  }

  .difference-copy p {
    font-size: clamp(3rem, 13vw, 4.7rem);
  }

  .section-intro h2,
  .workspace-head h2,
  .status-copy h2,
  .faq-heading h2,
  .final-copy h2,
  .demo-copy h2 {
    font-size: clamp(3rem, 13vw, 4.8rem);
  }

  .loop-track {
    grid-template-columns: 1fr;
  }

  .loop-step {
    min-height: 320px;
    border-right: 0;
    border-bottom: 1px solid var(--ink);
  }

  .loop-step:last-child {
    border-bottom: 0;
  }

  .signal-tabs {
    flex-direction: column;
  }

  .change-receipt {
    box-shadow: 8px 8px 0 var(--ink);
  }

  .workspace-board {
    padding: 22px;
    grid-template-columns: 1fr;
  }

  .workspace-arrow {
    transform: rotate(90deg);
  }

  .subject-row {
    grid-template-columns: 34px 1fr auto;
    padding-block: 20px;
  }

  .subject-row p {
    grid-column: 2;
  }

  .subject-row b {
    grid-row: 1 / 3;
    grid-column: 3;
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .trust-card:nth-child(2) {
    border-right: 0;
  }

  .trust-card:nth-child(-n + 2) {
    border-bottom: 1px solid var(--ink);
  }

  .capability-list > div {
    grid-template-columns: 20px 1fr;
  }

  .capability-list p {
    grid-column: 2;
  }

  .final-orbit {
    width: min(100%, 390px);
    margin-inline: auto;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .footer-grid p {
    text-align: left;
  }

  .footer-grid > div {
    justify-content: flex-start;
  }
}

@media (max-width: 480px) {
  .shell {
    width: min(100% - 24px, 430px);
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-stage {
    min-height: 625px;
  }

  .course-window {
    min-height: 490px;
  }

  .window-content {
    min-height: 447px;
  }

  .window-bar > span:nth-child(2) {
    display: none;
  }

  .window-bar {
    grid-template-columns: 1fr 1fr;
  }

  .lesson-page {
    padding-inline: 17px;
  }

  .lesson-page h2 {
    font-size: 2.5rem;
  }

  .source-note {
    width: 205px;
  }

  .adaptation-card {
    width: 94%;
  }

  .adaptation-actions span:first-child {
    display: none;
  }

  .difference-grid {
    gap: 24px;
  }

  .receipt-row {
    grid-template-columns: 58px 1fr;
    padding-inline: 13px;
  }

  .diff-preview {
    padding-left: 84px;
  }

  .receipt-actions {
    flex-wrap: wrap;
  }

  .receipt-actions button {
    flex: 1;
  }

  .receipt-actions .accept-button {
    flex-basis: 100%;
  }

  .workspace-output h3 {
    font-size: 1.9rem;
  }

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

  .trust-card {
    min-height: 235px;
    border-right: 0;
    border-bottom: 1px solid var(--ink);
  }

  .trust-card h3 {
    margin-top: 68px;
  }

  .orbit-label {
    display: none;
  }
}

/* Question-led course examples use the existing editorial palette and type. */
[hidden] { display: none !important; }

:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 5px;
}

section[id], main[id] { scroll-margin-top: 96px; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 110;
  padding: 12px 18px;
  background: var(--white);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.hero { gap: clamp(36px, 4vw, 64px); }
h1 { max-width: 10ch; }
.hero-stage { min-height: 0; padding-top: 92px; padding-bottom: 32px; }
.status-line { flex-wrap: wrap; font-size: 0.75rem; }
.status-pulse { animation: none; }
.focus-line { max-width: 35ch; font-size: 0.875rem; font-weight: 500; }
.eyebrow, .step-label, .board-label, .rail-label, .lesson-meta { font-size: 0.75rem; }
.site-nav a, .button, .text-link { font-size: 0.875rem; }
.course-window { min-height: 0; }
.window-bar { grid-template-columns: auto 1fr auto; gap: 16px; font-size: 0.75rem; }
.window-bar > :nth-child(2) { text-align: center; }
.private-label { font-size: 0.65rem; }
.window-content { grid-template-columns: 180px minmax(0, 1fr); min-height: 490px; }
.lesson-rail { padding-inline: 12px; }
.lesson-rail li { grid-template-columns: 18px 1fr; font-size: 0.8125rem; }
.lesson-rail li > span, .lesson-rail li small { font-size: 0.75rem; }
.lesson-rail li.active { margin-inline: -13px; padding-inline: 12px; }
.lesson-rail li.rail-child { margin-left: 10px; border-left: 1px solid var(--line); padding-left: 6px; }
.lesson-rail li.rail-grandchild { margin-left: 22px; border-left: 1px solid var(--line); padding-left: 6px; }
.lesson-page { padding: 28px 24px 60px; }
.lesson-page h2 { font-size: clamp(2.6rem, 3.4vw, 3.8rem); }
.lesson-page > p { color: #4e5360; font-size: 1.125rem; }
.lesson-page mark { background: var(--yellow); padding: 1px 3px; }
.confusion-chip { text-decoration: none; font-size: 0.875rem; }
.confusion-chip:hover { background: var(--cyan); }
.lesson-page > .lesson-aside { font: 0.875rem/1.5 var(--body); color: var(--muted); }
.note-type { font-size: 0.6875rem; }
.source-note { width: 255px; }
.source-note strong { font-size: 1.25rem; }
.source-note small { font-size: 0.75rem; }
.adaptation-card { position: relative; right: auto; bottom: auto; width: min(390px, 85%); margin: -28px -8px 20px auto; }
.adaptation-head small { font-size: 0.6875rem; }
.adaptation-head strong { font-size: 1.35rem; }
.adaptation-card p { font-size: 0.875rem; }
.branch-link { display: flex; justify-content: space-between; gap: 12px; align-items: center; min-height: 44px; text-underline-offset: 4px; font-size: 0.875rem; }
.stage-caption { bottom: 0; left: 28px; font-size: 0.6875rem; }
.difference-note { font-size: 1rem; }
.loop-track::before { display: none; }
.loop-step { min-height: 320px; padding-top: 28px; }
.step-number { font-size: 0.75rem; }
.loop-step .step-label { margin-top: 38px; }
.loop-step > p:last-child { font-size: 1rem; }
.section-intro > p:last-child, .workspace-head > p, .demo-copy > p, .final-copy > p { font-size: 1rem; }
.adapt-demo-grid { grid-template-columns: minmax(260px, 0.7fr) minmax(0, 1.3fr); gap: clamp(36px, 5vw, 72px); }
.signal-tab { padding-block: 12px; font-size: 0.875rem; }
.demo-copy > .demo-disclaimer { margin-top: 24px; font-size: 0.875rem; }
.branch-demo { min-width: 0; border: 1px solid var(--ink); background: var(--white); box-shadow: 10px 10px 0 var(--ink); }
.receipt-top { gap: 16px; padding-block: 12px; font-size: 0.75rem; }
.branch-demo-body { display: grid; grid-template-columns: minmax(160px, 0.8fr) minmax(0, 1.4fr); min-height: 470px; }
.course-tree { min-width: 0; padding: 24px 12px; border-right: 1px solid var(--line); background: #e6e9ef; }
.course-tree ol { margin: 0; padding: 0; list-style: none; }
.course-tree ol ol { margin-left: 10px; padding-left: 6px; border-left: 1px solid var(--line); }
.course-tree button { width: 100%; min-height: 44px; padding: 9px 7px; border: 0; background: transparent; text-align: left; font-size: 0.875rem; line-height: 1.4; cursor: pointer; overflow-wrap: anywhere; }
.course-tree button:hover { background: var(--paper-2); }
.course-tree button[aria-current="page"] { background: var(--cyan); color: var(--ink); font-weight: 700; }
.branch-reader { min-width: 0; padding: 26px 24px; }
.reader-breadcrumb { color: var(--muted); font: 0.75rem/1.6 var(--mono); overflow-wrap: anywhere; }
.branch-reader h3 { font: 500 2rem/1.08 var(--display); letter-spacing: -0.035em; margin-bottom: 20px; }
.branch-reader > p:not(.reader-breadcrumb) { font-size: 1rem; color: #4e5360; }
.question-choices { display: grid; gap: 10px; margin-top: 24px; }
.question-choices button { min-height: 48px; padding: 12px; border: 1px solid var(--ink); background: #fff6cc; text-align: left; font-size: 0.875rem; cursor: pointer; }
.question-choices button:hover { background: var(--yellow); }
.reader-back { display: block; min-height: 44px; margin-top: 16px; padding: 8px 0; border: 0; background: transparent; text-align: left; text-decoration: underline; text-underline-offset: 4px; font-size: 0.875rem; cursor: pointer; }
.branch-reader > .demo-end { border-top: 1px solid var(--line); padding-top: 20px; font-size: 0.875rem; }
.branch-demo-footer { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 14px 18px; border-top: 1px solid var(--ink); background: var(--paper-2); }
.branch-demo-footer p { margin: 0; font-size: 0.8125rem; }
.branch-demo-footer button { flex: 0 0 auto; min-height: 44px; padding: 8px 10px; border: 1px solid var(--ink); background: var(--white); font-size: 0.8125rem; cursor: pointer; }
.branch-demo-footer button:hover { background: var(--cyan); }
.course-features { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin-top: 60px; border: 1px solid var(--ink); background: var(--ink); color: var(--white); }
.course-features article { padding: clamp(24px, 4vw, 48px); }
.course-features article + article { border-left: 1px solid var(--line-light); }
.course-features .step-label { color: var(--cyan); }
.course-features h3 { max-width: 20ch; font: 500 2.25rem/1.1 var(--display); letter-spacing: -0.035em; }
.course-features article > p:last-child { color: #bec4d0; margin: 0; }
.subject-row { grid-template-columns: 32px minmax(160px, 0.9fr) minmax(0, 1.1fr); }
.subject-row p { font-size: 1rem; }
.faq-list summary { min-height: 56px; font-size: 1rem; gap: 16px; }
.faq-list details p { font-size: 1rem; }
.final-cta .final-copy { text-align: center; }
.final-copy > p { margin-inline: auto; }
.final-copy > small, .footer-grid p, .footer-grid > div a { font-size: 0.875rem; color: #bfc6d4; }
.footer-grid { grid-template-columns: auto 1fr; }
.footer-grid p { text-align: right; }
.footer-grid > div { grid-column: 1 / -1; flex-wrap: wrap; justify-content: flex-start; }

@media (max-width: 1080px) {
  .adapt-demo-grid { grid-template-columns: minmax(0, 1fr); }
  .branch-demo-body { grid-template-columns: minmax(180px, 0.65fr) minmax(0, 1.35fr); }
  .hero-lede { max-width: 52ch; }
}

@media (max-width: 780px) {
  html:not(.navigation-ready) .nav-shell { flex-wrap: wrap; padding-block: 16px; }
  html:not(.navigation-ready) .site-nav { position: static; display: flex; width: 100%; padding: 0; border: 0; }
  .hero-stage { padding-top: 110px; min-height: 0; }
  .window-content { grid-template-columns: minmax(0, 1fr); min-height: 0; }
  .lesson-page { padding: 28px 24px 70px; }
  .lesson-page h2 { max-width: 16ch; }
  .adaptation-card { margin-right: 0; width: min(390px, 92%); }
  .window-bar { gap: 8px; font-size: 0.6875rem; }
  .source-note { left: 4px; }
  .loop-step { min-height: 0; padding: 24px; }
  .loop-step .step-label { margin-top: 24px; }
  .branch-demo { box-shadow: 6px 6px 0 var(--ink); }
  .branch-demo-body { grid-template-columns: minmax(0, 1fr); min-height: 0; }
  .course-tree { border-right: 0; border-bottom: 1px solid var(--line); padding: 20px; }
  .branch-reader { padding: 24px 20px; }
  .branch-demo-footer { flex-wrap: wrap; gap: 10px; }
  .branch-demo-footer p { flex: 1 1 150px; }
  .course-features { grid-template-columns: 1fr; }
  .course-features article + article { border-left: 0; border-top: 1px solid var(--line-light); }
  .subject-row { grid-template-columns: 26px minmax(0, 1fr); }
  .subject-row p { grid-column: 2; }
  .subject-row h3 { min-width: 0; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-grid p { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

@media (max-width: 960px) {
  .site-nav { position: absolute; top: 70px; left: 0; right: 0; display: none; padding: 18px 16px 23px; align-items: stretch; flex-direction: column; gap: 0; border-bottom: 1px solid var(--ink); background: var(--paper); }
  .site-nav.open { display: flex; }
  .site-nav > a { min-height: 48px; display: flex; align-items: center; border-bottom: 1px solid var(--line); }
  .site-nav .nav-cta { margin-top: 10px; padding-inline: 14px; justify-content: space-between; }
  .menu-toggle { display: block; }
  html:not(.navigation-ready) .nav-shell { flex-wrap: wrap; padding-block: 16px; }
  html:not(.navigation-ready) .site-nav { position: static; display: flex; width: 100%; padding: 0; border: 0; }
}

@media (max-width: 480px) {
  .window-bar > span:nth-child(2) { display: block; }
  .window-bar { grid-template-columns: auto minmax(0, 1fr) auto; }
}

/* The longer challenger headline fits the same hero column. */
html[data-copy-variant="b"] h1 {
  max-width: 14ch;
  font-size: clamp(3.15rem, 4.8vw, 5rem);
}

/* Shared signup form keeps the copy test focused on wording. */
.waitlist-form { max-width: 620px; margin: 32px auto 0; text-align: left; }
.waitlist-form > label { display: block; margin-bottom: 10px; font-weight: 600; }
.waitlist-fields { display: flex; gap: 10px; }
.waitlist-fields input { min-width: 0; flex: 1; padding: 17px 18px; border: 1px solid #777; border-radius: 4px; background: #fffdf6; color: #1a1916; font: inherit; font-size: 16px; }
.waitlist-fields .button { white-space: nowrap; cursor: pointer; margin-top: 0; width: auto; }
.waitlist-form input:focus-visible, .waitlist-form button:focus-visible { outline: 3px solid #f5ad62; outline-offset: 4px; }
.waitlist-form .waitlist-consent { display: flex; gap: 10px; align-items: flex-start; margin: 18px 0 0; font-size: 14px; line-height: 1.5; font-weight: 400; }
.waitlist-consent input { flex: none; width: 18px; height: 18px; margin-top: 2px; accent-color: #2853dc; }
.final-copy .waitlist-note, .final-copy .waitlist-status { font-size: 14px; line-height: 1.6; max-width: none; margin: 12px 0 0; }
.waitlist-note a { text-decoration: underline; }
.waitlist-status { min-height: 1.6em; }
.waitlist-status[data-error="true"] { color: #ffd0b4; }
.waitlist-trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.waitlist-form button:disabled { opacity: .65; cursor: wait; }
@media (max-width: 600px) { .waitlist-fields { flex-direction: column; } .waitlist-fields .button { justify-content: center; width: 100%; } }