:root {
  --ink: #11110f;
  --ink-soft: #191916;
  --ink-lift: #24221d;
  --paper: #f0ede5;
  --paper-deep: #e2ddd1;
  --white: #faf8f1;
  --gold: #c9924b;
  --gold-bright: #e0aa62;
  --gold-deep: #9b6628;
  --line-dark: rgba(255, 255, 255, 0.14);
  --line-light: rgba(17, 17, 15, 0.15);
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --shell: min(1180px, calc(100vw - 48px));
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--white);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

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

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.skip-link {
  position: fixed;
  left: 18px;
  top: -70px;
  z-index: 1000;
  background: var(--gold-bright);
  color: var(--ink);
  padding: 11px 16px;
  font-weight: 750;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 18px;
}

.page-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  height: 2px;
  background: transparent;
}

.page-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--gold-bright);
}

.site-header {
  position: fixed;
  z-index: 100;
  top: 0;
  left: 0;
  right: 0;
  width: var(--shell);
  margin: 0 auto;
  height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.25s ease, width 0.25s ease, padding 0.25s ease,
    border-color 0.25s ease;
}

.site-header.scrolled {
  width: 100%;
  padding-inline: max(24px, calc((100vw - 1180px) / 2));
  background: rgba(17, 17, 15, 0.92);
  border-bottom: 1px solid var(--line-dark);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--white);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  line-height: 1;
}

.brand-mark {
  width: 37px;
  height: 37px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(224, 170, 98, 0.5);
  border-radius: 50%;
}

.brand-mark svg {
  width: 27px;
}

.brand-mark path {
  fill: none;
  stroke: var(--gold-bright);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 0.76rem;
  font-weight: 750;
}

.brand small {
  margin-top: 5px;
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.59rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-nav a {
  position: relative;
  color: rgba(255, 255, 255, 0.73);
  font-size: 0.76rem;
  font-weight: 650;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-nav a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -7px;
  width: 100%;
  height: 1px;
  background: var(--gold-bright);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s var(--ease);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--white);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-nav .nav-cta {
  color: var(--ink);
  background: var(--gold-bright);
  padding: 11px 17px;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 1px;
  margin: 7px auto;
  background: var(--white);
  transition: transform 0.25s ease;
}

.hero {
  position: relative;
  min-height: 900px;
  overflow: hidden;
  background:
    radial-gradient(circle at 68% 41%, rgba(186, 125, 54, 0.15), transparent 26%),
    radial-gradient(circle at 30% 0%, rgba(255, 255, 255, 0.05), transparent 30%),
    linear-gradient(145deg, #11110f 35%, #171613 100%);
  padding: 150px 0 0;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  pointer-events: none;
}

.hero::before {
  width: 720px;
  height: 720px;
  right: -140px;
  top: -100px;
}

.hero::after {
  width: 510px;
  height: 510px;
  right: -35px;
  top: 5px;
}

.hero-noise {
  position: absolute;
  inset: 0;
  opacity: 0.28;
  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='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.075'/%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-content,
.credibility,
.section-shell,
.site-footer {
  width: var(--shell);
  margin-inline: auto;
}

.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(380px, 0.72fr);
  align-items: center;
  min-height: 620px;
}

.eyebrow,
.kicker {
  margin: 0 0 24px;
  color: var(--gold-bright);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2,
.course-intro h2,
.lab-heading h2,
.author-copy h2,
.enquire-copy h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.95;
}

.hero h1 {
  max-width: 790px;
  font-size: clamp(4rem, 7.5vw, 7.25rem);
}

.hero h1 em {
  display: block;
  color: var(--gold-bright);
  font-weight: 400;
}

.hero-intro {
  max-width: 580px;
  margin: 33px 0 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 29px;
  margin-top: 37px;
}

.button {
  min-height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 0 21px;
  border: 1px solid transparent;
  color: inherit;
  font-size: 0.79rem;
  font-weight: 800;
  letter-spacing: 0.055em;
  text-decoration: none;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s ease, color 0.25s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-3px);
}

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

.button-primary:hover,
.button-primary:focus-visible {
  background: var(--white);
}

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

.button-dark:hover,
.button-dark:focus-visible {
  background: var(--white);
  color: var(--ink);
}

.button-outline-dark {
  border-color: rgba(17, 17, 15, 0.45);
  color: var(--ink);
}

.button-outline-dark:hover,
.button-outline-dark:focus-visible {
  background: var(--ink);
  color: var(--white);
}

.button span {
  font-size: 1rem;
}

.text-link {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.text-link span {
  display: inline-block;
  color: var(--gold-bright);
  margin-left: 5px;
  transition: transform 0.2s ease;
}

.text-link:hover span {
  transform: translateY(4px);
}

.hero-pillars {
  display: flex;
  gap: 26px;
  margin: 37px 0 0;
  padding: 0;
  list-style: none;
  color: rgba(255, 255, 255, 0.47);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.19em;
  text-transform: uppercase;
}

.hero-pillars li + li::before {
  content: "•";
  color: var(--gold);
  margin-right: 26px;
}

.hero-visual {
  position: relative;
  min-height: 620px;
  display: grid;
  place-items: center;
  perspective: 1400px;
}

.book {
  position: relative;
  z-index: 2;
  width: min(350px, 76%);
  margin: 0;
  transform: rotateY(-9deg) rotateZ(2deg);
  transform-style: preserve-3d;
  filter: drop-shadow(28px 34px 28px rgba(0, 0, 0, 0.42));
  transition: transform 0.5s var(--ease);
}

.book::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 5px -11px 5px 100%;
  background: linear-gradient(90deg, #d3c9b4, #827761);
  transform: rotateY(70deg);
  transform-origin: left;
}

.book::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.16), transparent 28%);
  pointer-events: none;
}

.hero-visual:hover .book {
  transform: rotateY(-3deg) rotateZ(0deg) translateY(-8px);
}

.book img {
  width: 100%;
}

.book-glow {
  position: absolute;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: rgba(201, 146, 75, 0.14);
  filter: blur(50px);
}

.hero-note {
  position: absolute;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 15px 10px 10px;
  background: rgba(22, 21, 18, 0.88);
  border: 1px solid var(--line-dark);
  backdrop-filter: blur(14px);
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero-note span {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  background: var(--gold-bright);
  color: var(--ink);
  font-size: 0.58rem;
}

.hero-note-one {
  left: -10px;
  top: 180px;
}

.hero-note-two {
  right: -4px;
  bottom: 152px;
}

.hero-wave {
  position: absolute;
  z-index: 1;
  left: 0;
  right: 0;
  top: 445px;
  opacity: 0.7;
  pointer-events: none;
}

.hero-wave svg {
  width: 100%;
  height: 240px;
  overflow: visible;
}

.hero-wave path {
  fill: none;
  stroke: var(--gold);
  stroke-width: 1.1;
  vector-effect: non-scaling-stroke;
}

.hero-wave .wave-shadow {
  stroke: rgba(201, 146, 75, 0.13);
  stroke-width: 12px;
  filter: blur(5px);
}

.credibility {
  position: relative;
  z-index: 3;
  min-height: 130px;
  display: grid;
  grid-template-columns: auto 1fr auto 1fr;
  align-items: center;
  gap: 25px;
  border-top: 1px solid var(--line-dark);
}

.credibility p {
  margin: 0;
  color: rgba(255, 255, 255, 0.37);
  font-size: 0.58rem;
  font-weight: 750;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.credibility div {
  display: flex;
  align-items: center;
  gap: 15px;
  color: rgba(255, 255, 255, 0.72);
  font-family: var(--serif);
  font-size: 1.08rem;
}

.credibility i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--gold);
}

.section-light,
.section-paper {
  color: var(--ink);
}

.section-light {
  background: var(--paper);
}

.section-dark {
  background: var(--ink);
  color: var(--white);
}

.section-paper {
  background: #e9e4da;
}

.section-gold {
  color: var(--ink);
  background: var(--gold);
}

.problem {
  padding: 138px 0 148px;
}

.section-heading h2,
.course-intro h2,
.lab-heading h2,
.author-copy h2,
.enquire-copy h2 {
  font-size: clamp(3.2rem, 6vw, 6rem);
}

.problem .section-heading {
  max-width: 950px;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 78px;
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.problem-card {
  min-height: 310px;
  padding: 31px 36px 40px 0;
}

.problem-card + .problem-card {
  padding-left: 36px;
  border-left: 1px solid var(--line-light);
}

.problem-card > span,
.module-number {
  display: block;
  color: var(--gold-deep);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.problem-card h3 {
  margin: 57px 0 17px;
  font-family: var(--serif);
  font-size: 2.2rem;
  font-weight: 400;
}

.problem-card p {
  max-width: 310px;
  margin: 0;
  color: rgba(17, 17, 15, 0.63);
}

.big-idea {
  display: grid;
  grid-template-columns: 2fr 1fr;
  align-items: end;
  gap: 40px;
  margin: 108px 0 0;
  padding: 0;
  border: 0;
}

.big-idea p {
  margin: 0;
  max-width: 830px;
  font-family: var(--serif);
  font-size: clamp(2.8rem, 5.4vw, 5.4rem);
  letter-spacing: -0.045em;
  line-height: 1;
}

.big-idea footer {
  padding-bottom: 7px;
  color: var(--gold-deep);
  font-size: 0.83rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.method {
  padding: 145px 0;
  overflow: hidden;
}

.section-heading.split {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 80px;
  align-items: end;
}

.section-heading.split > p {
  max-width: 440px;
  margin: 0 0 7px;
  color: rgba(255, 255, 255, 0.56);
  font-size: 1.04rem;
}

.control-explorer {
  margin-top: 93px;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.control-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line-dark);
}

.control-nav button {
  position: relative;
  min-height: 82px;
  border: 0;
  border-right: 1px solid var(--line-dark);
  background: transparent;
  color: rgba(255, 255, 255, 0.42);
  text-align: left;
  padding: 0 20px;
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease;
}

.control-nav button:last-child {
  border-right: 0;
}

.control-nav button span {
  display: block;
  margin-bottom: 3px;
  color: rgba(224, 170, 98, 0.55);
  font-size: 0.56rem;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.control-nav button::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: -1px;
  height: 2px;
  background: var(--gold-bright);
  transform: scaleX(0);
  transition: transform 0.3s var(--ease);
}

.control-nav button:hover,
.control-nav button:focus-visible,
.control-nav button.active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.025);
}

.control-nav button.active::after {
  transform: scaleX(1);
}

.control-panel {
  min-height: 470px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.control-copy {
  max-width: 520px;
  padding: 65px 30px 65px 0;
}

.control-number {
  margin: 0 0 37px;
  color: var(--gold-bright);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.15em;
}

.control-copy h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.5rem, 7vw, 6.7rem);
  font-weight: 400;
  letter-spacing: -0.05em;
  line-height: 0.9;
}

.control-question {
  margin: 26px 0 13px;
  color: var(--gold-bright);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.control-copy p:last-child {
  max-width: 470px;
  color: rgba(255, 255, 255, 0.6);
  font-size: 1.04rem;
}

.control-visual {
  position: relative;
  min-height: 470px;
  display: grid;
  place-items: center;
  border-left: 1px solid var(--line-dark);
  overflow: hidden;
}

.control-visual::before,
.control-visual::after {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 50%;
}

.control-visual::after {
  width: 245px;
  height: 245px;
}

.control-visual > p {
  position: relative;
  z-index: 4;
  margin-top: 180px;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.pulse-ring {
  position: absolute;
  width: 100px;
  height: 100px;
  border: 1px solid var(--gold-bright);
  border-radius: 50%;
  animation: pulse 2.6s ease-out infinite;
}

.ring-two {
  animation-delay: 1.3s;
}

.pulse-dot {
  position: absolute;
  z-index: 3;
  width: 36px;
  height: 36px;
  border: 7px solid rgba(224, 170, 98, 0.22);
  border-radius: 50%;
  background: var(--gold-bright);
  background-clip: padding-box;
}

@keyframes pulse {
  from {
    opacity: 0.8;
    transform: scale(0.4);
  }
  to {
    opacity: 0;
    transform: scale(2.8);
  }
}

.control-visual[data-control-visual="density"] .pulse-ring {
  border-radius: 0;
  width: 7px;
  height: 180px;
  animation: density-bars 1.6s ease-in-out infinite alternate;
}

.control-visual[data-control-visual="dynamics"] .pulse-ring {
  animation-duration: 1.7s;
}

.control-visual[data-control-visual="melodic"] .pulse-dot {
  animation: melodic-path 3s var(--ease) infinite alternate;
}

@keyframes density-bars {
  from { transform: translateX(-70px) scaleY(0.28); opacity: 0.3; }
  to { transform: translateX(70px) scaleY(1); opacity: 1; }
}

@keyframes melodic-path {
  0% { transform: translate(-105px, 70px); }
  50% { transform: translate(0, -60px); }
  100% { transform: translate(105px, 45px); }
}

.three-systems {
  display: grid;
  grid-template-columns: 0.76fr 1.24fr;
  gap: 90px;
  margin-top: 140px;
}

.system-intro h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.8rem, 4.4vw, 4.4rem);
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1;
}

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

.system-flow li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 20px;
  padding: 29px 0;
  border-bottom: 1px solid var(--line-dark);
}

.system-flow > li > span {
  color: var(--gold-bright);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  padding-top: 8px;
}

.system-flow h4 {
  margin: 0 0 7px;
  font-family: var(--serif);
  font-size: 1.7rem;
  font-weight: 400;
}

.system-flow p {
  margin: 0;
  color: rgba(255, 255, 255, 0.53);
}

.fill-lab {
  padding: 125px 0 132px;
  overflow: hidden;
}

.fill-lab .kicker {
  color: rgba(17, 17, 15, 0.58);
}

.lab-heading {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  align-items: end;
  column-gap: 70px;
}

.lab-heading .kicker {
  grid-column: 1 / -1;
}

.lab-heading > p:last-child {
  max-width: 430px;
  margin: 0 0 9px;
  color: rgba(17, 17, 15, 0.65);
}

.lab {
  margin-top: 69px;
  display: grid;
  grid-template-columns: 0.32fr 0.68fr;
  min-height: 510px;
  border: 1px solid rgba(17, 17, 15, 0.28);
}

.lab-prompts {
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(17, 17, 15, 0.28);
}

.lab-prompts button {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 29px;
  border: 0;
  border-bottom: 1px solid rgba(17, 17, 15, 0.2);
  background: transparent;
  color: rgba(17, 17, 15, 0.58);
  font-family: var(--serif);
  font-size: 1.55rem;
  text-align: left;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, padding 0.2s ease;
}

.lab-prompts button:last-child {
  border-bottom: 0;
}

.lab-prompts button::after {
  content: "→";
  font-family: var(--sans);
  font-size: 1rem;
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.lab-prompts button:hover,
.lab-prompts button:focus-visible,
.lab-prompts button.active {
  padding-left: 36px;
  background: var(--ink);
  color: var(--white);
}

.lab-prompts button.active::after {
  opacity: 1;
  transform: translateX(0);
}

.lab-result {
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  align-items: center;
  gap: 40px;
  padding: 45px 55px;
  background: rgba(255, 255, 255, 0.1);
}

.lab-orbit {
  position: relative;
  width: min(360px, 100%);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  margin-inline: auto;
  border: 1px solid rgba(17, 17, 15, 0.28);
  border-radius: 50%;
}

.lab-orbit::before,
.lab-orbit::after {
  content: "";
  position: absolute;
  width: 66%;
  height: 66%;
  border: 1px solid rgba(17, 17, 15, 0.17);
  border-radius: 50%;
}

.lab-orbit::after {
  width: 36%;
  height: 36%;
  background: var(--ink);
  border-color: var(--ink);
}

.orbit-purpose {
  position: relative;
  z-index: 2;
  color: var(--white);
  font-family: var(--serif);
  font-size: 2rem;
}

.orbit-item {
  position: absolute;
  z-index: 3;
  padding: 6px 9px;
  background: var(--gold);
  color: rgba(17, 17, 15, 0.7);
  font-size: 0.61rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.item-feel { top: -12px; left: 50%; transform: translateX(-50%); }
.item-density { right: -24px; top: 50%; transform: translateY(-50%); }
.item-dynamics { bottom: -12px; left: 50%; transform: translateX(-50%); }
.item-path { left: -14px; top: 50%; transform: translateY(-50%); }

.lab-result dl {
  margin: 0;
  border-top: 1px solid rgba(17, 17, 15, 0.25);
}

.lab-result dl div {
  display: flex;
  justify-content: space-between;
  gap: 25px;
  padding: 17px 0;
  border-bottom: 1px solid rgba(17, 17, 15, 0.25);
}

.lab-result dt {
  color: rgba(17, 17, 15, 0.52);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lab-result dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.08rem;
}

.lab-footnote {
  max-width: 510px;
  margin: 27px 0 0 auto;
  color: rgba(17, 17, 15, 0.55);
  font-size: 0.78rem;
}

.course {
  padding: 145px 0 155px;
}

.course-intro {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  column-gap: 70px;
  align-items: end;
}

.course-intro .kicker {
  grid-column: 1 / -1;
}

.course-intro > p:last-child {
  max-width: 430px;
  margin: 0 0 7px;
  color: rgba(17, 17, 15, 0.62);
}

.course-modules {
  margin-top: 90px;
  border-top: 1px solid var(--line-light);
}

.module {
  display: grid;
  grid-template-columns: 90px 1fr 50px;
  align-items: center;
  gap: 30px;
  min-height: 184px;
  padding: 30px 10px 30px 0;
  border-bottom: 1px solid var(--line-light);
  transition: padding 0.28s var(--ease), background 0.28s ease;
}

.module:hover {
  padding-left: 22px;
  background: rgba(255, 255, 255, 0.24);
}

.module > div {
  display: grid;
  grid-template-columns: 0.4fr 0.8fr 1.2fr;
  align-items: center;
  gap: 30px;
}

.module-label {
  color: var(--gold-deep);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.module h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 2.15rem;
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.module p {
  margin: 0;
}

.module > div > p:last-child {
  max-width: 430px;
  color: rgba(17, 17, 15, 0.61);
}

.module-mark {
  font-size: 1.5rem;
  color: var(--gold-deep);
  transition: transform 0.25s ease;
}

.module:hover .module-mark {
  transform: translateX(7px);
}

.outcomes {
  margin-top: 130px;
  display: grid;
  grid-template-columns: 0.6fr 1.4fr;
  gap: 80px;
}

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

.outcomes li {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-light);
  font-family: var(--serif);
  font-size: 1.4rem;
}

.outcomes li span {
  color: var(--gold-deep);
  font-family: var(--sans);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  padding-top: 7px;
}

.pricing {
  margin-top: 135px;
  padding-top: 125px;
  border-top: 1px solid var(--line-light);
  scroll-margin-top: 70px;
}

.pricing-heading {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: end;
  gap: 70px;
}

.pricing-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.2rem, 6vw, 6rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.95;
}

.pricing-heading > p {
  max-width: 430px;
  margin: 0 0 7px;
  color: rgba(17, 17, 15, 0.62);
}

.price-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 65px;
}

.price-card {
  min-height: 490px;
  display: flex;
  flex-direction: column;
  padding: 38px;
  border: 1px solid var(--line-light);
  background: rgba(255, 255, 255, 0.24);
}

.price-card-featured {
  border-color: var(--gold);
  background: var(--gold);
}

.price-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(17, 17, 15, 0.22);
}

.price-card-top p,
.price-card-top span {
  margin: 0;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.price-card-top p {
  color: rgba(17, 17, 15, 0.55);
}

.price-card-top span {
  padding: 6px 9px;
  border: 1px solid rgba(17, 17, 15, 0.25);
}

.price {
  margin: 57px 0 21px;
  font-family: var(--serif);
  font-size: clamp(5.5rem, 10vw, 8.2rem);
  letter-spacing: -0.07em;
  line-height: 0.85;
}

.price sup {
  position: relative;
  top: -0.7em;
  margin-right: 7px;
  font-family: var(--sans);
  font-size: 0.18em;
  font-weight: 800;
  letter-spacing: 0;
}

.price-description {
  max-width: 460px;
  margin: 0 0 37px;
  color: rgba(17, 17, 15, 0.62);
}

.price-card .button {
  width: 100%;
  margin-top: auto;
}

.author {
  padding: 145px 0;
  background: var(--paper);
}

.author-grid {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  gap: clamp(70px, 10vw, 140px);
  align-items: center;
}

.author-photo {
  position: relative;
}

.author-photo::before {
  content: "";
  position: absolute;
  inset: 20px -20px -20px 20px;
  border: 1px solid var(--gold);
}

.author-photo img {
  position: relative;
  z-index: 1;
  width: 100%;
  aspect-ratio: 0.92;
  object-fit: cover;
  object-position: top;
  filter: saturate(0.7) contrast(1.05);
}

.author-photo > p {
  position: absolute;
  z-index: 2;
  right: -43px;
  bottom: 40px;
  min-width: 138px;
  margin: 0;
  padding: 15px 18px;
  background: var(--ink);
  color: var(--white);
  font-family: var(--serif);
  font-size: 1.2rem;
}

.author-photo > p span {
  display: block;
  color: var(--gold-bright);
  font-family: var(--sans);
  font-size: 0.56rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.author-lead {
  max-width: 690px;
  margin: 33px 0;
  color: var(--gold-deep);
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2vw, 1.65rem);
  line-height: 1.45;
}

.author-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.author-columns p {
  margin: 0;
  color: rgba(17, 17, 15, 0.63);
}

.author-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 37px 0 0;
  padding: 0;
  list-style: none;
}

.author-facts li {
  padding: 8px 11px;
  border: 1px solid var(--line-light);
  color: rgba(17, 17, 15, 0.65);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.enquire {
  padding: 145px 0;
}

.enquire-grid {
  display: grid;
  grid-template-columns: 0.86fr 1.14fr;
  gap: 100px;
}

.enquire-copy > p:not(.kicker) {
  max-width: 450px;
  margin: 33px 0 22px;
  color: rgba(255, 255, 255, 0.58);
}

.email-link {
  color: var(--gold-bright);
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
  font-size: 0.84rem;
}

.enquiry-form {
  padding: 43px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.025);
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.enquiry-form label {
  display: block;
  margin-bottom: 25px;
}

.enquiry-form label > span {
  display: block;
  margin-bottom: 9px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.enquiry-form input,
.enquiry-form select,
.enquiry-form textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 0;
  outline: 0;
  background: transparent;
  color: var(--white);
  padding: 12px 0;
  transition: border-color 0.2s ease;
}

.enquiry-form select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--gold-bright) 50%),
    linear-gradient(135deg, var(--gold-bright) 50%, transparent 50%);
  background-position:
    calc(100% - 12px) 50%,
    calc(100% - 7px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}

.enquiry-form select option {
  background: var(--ink);
  color: var(--white);
}

.enquiry-form textarea {
  resize: vertical;
}

.enquiry-form input:focus,
.enquiry-form select:focus,
.enquiry-form textarea:focus {
  border-color: var(--gold-bright);
}

.enquiry-form textarea::placeholder {
  color: rgba(255, 255, 255, 0.25);
}

.enquiry-form .button {
  width: 100%;
  border: 0;
}

.form-note {
  margin: 13px 0 0;
  color: rgba(255, 255, 255, 0.35);
  font-size: 0.69rem;
}

.site-footer {
  min-height: 260px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-content: center;
  gap: 45px 90px;
  border-top: 1px solid var(--line-dark);
}

.site-footer > div:first-child > p {
  margin: 17px 0 0;
  color: rgba(255, 255, 255, 0.38);
  font-family: var(--serif);
}

.footer-links {
  display: flex;
  gap: 30px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.7rem;
  font-weight: 700;
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--gold-bright);
}

.copyright {
  grid-column: 1 / -1;
  margin: 0;
  padding-top: 24px;
  border-top: 1px solid var(--line-dark);
  color: rgba(255, 255, 255, 0.27);
  font-size: 0.64rem;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1020px) {
  :root {
    --shell: min(100% - 40px, 920px);
  }

  .hero {
    padding-top: 120px;
  }

  .hero-content {
    grid-template-columns: 1.08fr 0.92fr;
  }

  .hero h1 {
    font-size: clamp(3.8rem, 8.4vw, 5.7rem);
  }

  .hero-note {
    display: none;
  }

  .book {
    width: min(310px, 82%);
  }

  .credibility {
    grid-template-columns: auto 1fr;
    padding-block: 25px;
  }

  .section-heading.split,
  .course-intro,
  .lab-heading {
    grid-template-columns: 1fr;
  }

  .section-heading.split {
    align-items: start;
  }

  .section-heading.split > p,
  .course-intro > p:last-child,
  .lab-heading > p:last-child {
    margin-top: 30px;
  }

  .lab-result {
    grid-template-columns: 1fr;
  }

  .lab-orbit {
    width: 260px;
  }

  .module > div {
    grid-template-columns: 0.35fr 0.85fr 1.2fr;
  }

  .author-grid {
    grid-template-columns: 0.7fr 1.3fr;
    gap: 65px;
  }

  .enquire-grid {
    gap: 60px;
  }
}

@media (max-width: 760px) {
  :root {
    --shell: calc(100vw - 34px);
  }

  html {
    scroll-padding-top: 72px;
  }

  .site-header,
  .site-header.scrolled {
    height: 70px;
    width: 100%;
    padding-inline: 17px;
  }

  .menu-toggle {
    position: relative;
    z-index: 102;
    display: block;
  }

  .menu-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(4px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 101;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: stretch;
    gap: 0;
    padding: 100px 30px 50px;
    background: rgba(17, 17, 15, 0.98);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  }

  .site-nav.open {
    visibility: visible;
    opacity: 1;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 18px 0;
    border-bottom: 1px solid var(--line-dark);
    color: var(--white);
    font-family: var(--serif);
    font-size: 2rem;
    font-weight: 400;
    letter-spacing: -0.02em;
  }

  .site-nav .nav-cta {
    margin-top: 25px;
    padding: 18px;
    color: var(--ink);
    font-family: var(--sans);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-align: center;
    text-transform: uppercase;
  }

  .hero {
    min-height: auto;
    padding-top: 130px;
  }

  .hero-content {
    display: block;
    min-height: auto;
  }

  .hero h1 {
    font-size: clamp(3.45rem, 16vw, 5.4rem);
  }

  .hero-intro {
    font-size: 1rem;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 20px;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-pillars {
    gap: 12px;
    font-size: 0.54rem;
    letter-spacing: 0.12em;
  }

  .hero-pillars li + li::before {
    margin-right: 12px;
  }

  .hero-visual {
    min-height: 530px;
  }

  .book {
    width: min(295px, 72vw);
  }

  .hero-wave {
    top: auto;
    bottom: 140px;
  }

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

  .credibility p:nth-of-type(2) {
    margin-top: 13px;
  }

  .problem,
  .method,
  .course,
  .author,
  .enquire {
    padding: 95px 0;
  }

  .fill-lab {
    padding: 90px 0 95px;
  }

  .section-heading h2,
  .course-intro h2,
  .lab-heading h2,
  .author-copy h2,
  .enquire-copy h2 {
    font-size: clamp(3rem, 14vw, 4.8rem);
  }

  .problem-grid {
    grid-template-columns: 1fr;
    margin-top: 55px;
  }

  .problem-card {
    min-height: 0;
    padding: 25px 0 32px;
  }

  .problem-card + .problem-card {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line-light);
  }

  .problem-card h3 {
    margin: 22px 0 10px;
  }

  .big-idea {
    grid-template-columns: 1fr;
    margin-top: 75px;
  }

  .big-idea p {
    font-size: 3rem;
  }

  .control-explorer {
    margin-top: 60px;
  }

  .control-nav {
    grid-template-columns: 1fr 1fr;
  }

  .control-nav button {
    min-height: 72px;
    border-bottom: 1px solid var(--line-dark);
  }

  .control-nav button:nth-child(2) {
    border-right: 0;
  }

  .control-panel {
    grid-template-columns: 1fr;
  }

  .control-copy {
    padding: 50px 10px 35px 0;
  }

  .control-visual {
    min-height: 330px;
    border-top: 1px solid var(--line-dark);
    border-left: 0;
  }

  .three-systems {
    grid-template-columns: 1fr;
    gap: 45px;
    margin-top: 95px;
  }

  .lab {
    grid-template-columns: 1fr;
    margin-top: 50px;
  }

  .lab-prompts {
    flex-direction: row;
    overflow-x: auto;
    border-right: 0;
    border-bottom: 1px solid rgba(17, 17, 15, 0.28);
  }

  .lab-prompts button {
    flex: 0 0 auto;
    min-height: 65px;
    padding: 0 20px;
    border-bottom: 0;
    border-right: 1px solid rgba(17, 17, 15, 0.2);
    font-size: 1.2rem;
  }

  .lab-prompts button:hover,
  .lab-prompts button:focus-visible,
  .lab-prompts button.active {
    padding-left: 20px;
  }

  .lab-result {
    padding: 48px 28px 35px;
  }

  .lab-orbit {
    width: min(270px, 78vw);
  }

  .course-modules {
    margin-top: 60px;
  }

  .module {
    grid-template-columns: 42px 1fr;
    gap: 15px;
    padding: 28px 0;
  }

  .module > div {
    display: block;
  }

  .module-label {
    margin-bottom: 7px;
  }

  .module h3 {
    font-size: 1.8rem;
  }

  .module > div > p:last-child {
    margin-top: 14px;
  }

  .module-mark {
    display: none;
  }

  .outcomes {
    grid-template-columns: 1fr;
    gap: 25px;
    margin-top: 90px;
  }

  .outcomes li {
    font-size: 1.2rem;
  }

  .pricing {
    margin-top: 90px;
    padding-top: 90px;
  }

  .pricing-heading,
  .price-grid {
    grid-template-columns: 1fr;
  }

  .pricing-heading {
    gap: 25px;
  }

  .pricing-heading h2 {
    font-size: clamp(3rem, 14vw, 4.8rem);
  }

  .price-grid {
    margin-top: 45px;
  }

  .price-card {
    min-height: 430px;
    padding: 29px 24px;
  }

  .author-grid,
  .enquire-grid {
    grid-template-columns: 1fr;
  }

  .author-photo {
    width: calc(100% - 25px);
    max-width: 480px;
  }

  .author-photo > p {
    right: -26px;
  }

  .author-columns,
  .field-row {
    grid-template-columns: 1fr;
  }

  .enquiry-form {
    padding: 28px 22px;
  }

  .site-footer {
    grid-template-columns: 1fr;
    padding: 70px 0 40px;
  }

  .footer-links {
    align-items: flex-start;
    flex-direction: column;
    gap: 15px;
  }
}

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

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

  .reveal {
    opacity: 1;
    transform: none;
  }
}