:root {
  --landing-blue: #0759d9;
  --landing-blue-strong: #0648b5;
  --landing-navy: #071936;
  --landing-ink: #111a2d;
  --landing-muted: #5e6b84;
  --landing-line: #d7e2f4;
  --landing-wash: #f5f8ff;
  --landing-header-height: 74px;
}

html {
  scroll-behavior: smooth;
}

body.landing-v4 {
  margin: 0;
  overflow-x: hidden;
  background: #fff;
  color: var(--landing-ink);
  font-family: "Be Vietnam Pro", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.landing-v4 *,
.landing-v4 *::before,
.landing-v4 *::after {
  box-sizing: border-box;
}

.landing-v4 a {
  color: inherit;
}

.landing-v4-skip-link {
  position: fixed;
  z-index: 200;
  top: 12px;
  left: 16px;
  padding: 11px 16px;
  border: 2px solid #fff;
  border-radius: 10px;
  background: var(--landing-navy);
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

.landing-v4-skip-link:focus {
  outline: 3px solid #78aaff;
  outline-offset: 2px;
  transform: translateY(0);
}

.landing-v4-shell {
  min-height: 100vh;
}

.landing-v4 .landing-v4-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  width: 100%;
  height: var(--landing-header-height);
  min-height: var(--landing-header-height);
  padding: 0 clamp(32px, 5vw, 88px);
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto minmax(220px, 1fr);
  align-items: center;
  border-bottom: 1px solid rgba(205, 218, 239, .88);
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(18px);
}

.landing-v4-brand {
  width: max-content;
  height: auto;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 11px;
  overflow: visible;
  background: none;
  color: #164d92;
  font-size: inherit;
  line-height: 1;
  text-decoration: none;
  white-space: normal;
}

.landing-v4-brand::before {
  display: none;
}

.landing-v4-brand img {
  width: 45px;
  height: 45px;
  display: block;
  object-fit: contain;
}

.landing-v4-brand > span {
  display: grid;
  gap: 4px;
}

.landing-v4-brand b {
  font-size: 23px;
  font-weight: 800;
  letter-spacing: -.035em;
}

.landing-v4-brand small {
  color: #6e7890;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0;
}

.landing-v4 .landing-v4-nav {
  grid-column: 2 / 4;
  width: 100%;
  display: grid;
  grid-template-columns: minmax(420px, 1fr) minmax(240px, 1fr);
  align-items: center;
  gap: clamp(34px, 5vw, 76px);
}

.landing-v4-nav__primary,
.landing-v4-nav__account {
  display: flex;
  align-items: center;
}

.landing-v4-nav__primary {
  justify-content: center;
  gap: clamp(26px, 3vw, 46px);
}

.landing-v4-nav__account {
  justify-content: flex-end;
  gap: 18px;
}

.landing-v4-nav__primary a {
  position: relative;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: #27334a;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.landing-v4-nav__primary a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 6px;
  left: 0;
  height: 2px;
  border-radius: 999px;
  background: var(--landing-blue);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 180ms ease;
}

.landing-v4-nav__primary a:hover::after,
.landing-v4-nav__primary a:focus-visible::after,
.landing-v4-nav__primary a.is-active::after {
  transform: scaleX(1);
}

.landing-v4-nav-button {
  min-height: 44px;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--landing-blue);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.landing-v4-nav-button.is-secondary {
  border-color: transparent;
  color: var(--landing-blue);
}

.landing-v4-nav-button.is-primary {
  background: var(--landing-blue);
  color: #fff;
}

.landing-v4-nav-button:hover,
.landing-v4-nav-button:focus-visible,
.landing-v4-nav__primary a:focus-visible {
  outline: 3px solid rgba(7, 89, 217, .2);
  outline-offset: 3px;
}

.landing-v4-brand:focus-visible,
.landing-v4-next:focus-visible,
.landing-v4-footer a:focus-visible {
  border-radius: 8px;
  outline: 3px solid rgba(7, 89, 217, .28);
  outline-offset: 4px;
}

.landing-v4 .landing-v4-nav .nav-auth-slot {
  margin: 0;
  display: flex;
  justify-content: flex-end;
  gap: 18px;
}

.landing-v4 .landing-v4-nav .account-menu {
  position: relative;
}

.landing-v4 .landing-v4-nav .account-avatar {
  width: 44px;
  height: 44px;
  min-width: 44px;
  padding: 0;
  border: 1px solid #b9cae6;
  border-radius: 50%;
  background: #eef4ff;
  color: var(--landing-blue);
}

.landing-v4-main {
  padding-top: var(--landing-header-height);
}

.landing-v4-main:focus {
  outline: none;
}

.landing-v4-section {
  position: relative;
  min-height: calc(100dvh - var(--landing-header-height));
  overflow: hidden;
  display: grid;
  align-items: center;
  border-bottom: 1px solid #e5ebf5;
  background:
    radial-gradient(circle at 82% 18%, rgba(66, 132, 236, .09), transparent 30%),
    linear-gradient(180deg, #fff, #fbfdff);
  scroll-margin-top: var(--landing-header-height);
}

.landing-v4-section:nth-child(odd):not(.landing-v4-section--dark) {
  background:
    radial-gradient(circle at 15% 75%, rgba(66, 132, 236, .08), transparent 27%),
    linear-gradient(180deg, #f9fbff, #fff);
}

.landing-v4-inner {
  width: min(1560px, calc(100% - clamp(260px, 17vw, 340px)));
  margin-right: auto;
  margin-left: clamp(170px, 12vw, 220px);
}

.landing-v4-section-grid,
.landing-v4-hero__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: center;
  gap: clamp(56px, 8vw, 130px);
}

.landing-v4-section-grid.is-reversed .landing-v4-copy {
  grid-column: 2;
}

.landing-v4-section-grid.is-reversed > :last-child {
  grid-column: 1;
  grid-row: 1;
}

.landing-v4-copy {
  max-width: 720px;
}

.landing-v4-eyebrow {
  margin: 0 0 18px;
  color: var(--landing-blue);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .14em;
  line-height: 1.4;
  text-transform: uppercase;
}

.landing-v4-copy h1,
.landing-v4-copy h2 {
  max-width: 720px;
  margin: 0;
  color: var(--landing-ink);
  font-weight: 800;
  letter-spacing: -.055em;
  text-wrap: balance;
}

.landing-v4-copy h1 {
  font-size: clamp(58px, 5.7vw, 84px);
  line-height: .99;
}

.landing-v4-copy h2 {
  font-size: clamp(48px, 4.6vw, 68px);
  line-height: 1.01;
}

.landing-v4-copy > p:not(.landing-v4-eyebrow, .landing-v4-support),
.landing-v4-lede {
  max-width: 620px;
  margin: 26px 0 0;
  color: var(--landing-muted);
  font-size: clamp(18px, 1.35vw, 21px);
  line-height: 1.62;
}

.landing-v4-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.landing-v4-hero .landing-v4-actions {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
}

.landing-v4-hero .landing-v4-button {
  padding-inline: 18px;
  font-size: 15px;
}

.landing-v4-button,
.landing-v4-text-link {
  min-height: 54px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 800;
  text-decoration: none;
}

.landing-v4-button {
  padding: 13px 22px;
  border: 1px solid var(--landing-blue);
  border-radius: 11px;
}

.landing-v4-button.is-primary {
  background: var(--landing-blue);
  color: #fff;
  box-shadow: 0 14px 32px rgba(7, 89, 217, .18);
}

.landing-v4-button.is-secondary {
  background: #fff;
  color: var(--landing-blue);
}

.landing-v4-button.is-light {
  margin-top: 30px;
  border-color: #fff;
  background: #fff;
  color: var(--landing-navy);
}

.landing-v4-button:hover,
.landing-v4-button:focus-visible,
.landing-v4-text-link:hover,
.landing-v4-text-link:focus-visible {
  outline: 3px solid rgba(7, 89, 217, .2);
  outline-offset: 4px;
  transform: translateY(-1px);
}

.landing-v4-text-link {
  width: max-content;
  margin-top: 24px;
  color: var(--landing-blue);
}

.landing-v4-highlight-link {
  min-height: 56px;
  margin-top: 26px;
  font-size: clamp(19px, 1.45vw, 23px);
  letter-spacing: -.02em;
  text-shadow: 0 0 0 rgba(31, 125, 255, 0);
  transition: color 220ms ease, text-shadow 220ms ease, transform 220ms ease;
}

.landing-v4-highlight-link:hover,
.landing-v4-highlight-link:focus-visible {
  outline: none;
  color: #0b66ec;
  text-decoration: underline;
  text-decoration-color: rgba(11, 102, 236, .5);
  text-decoration-thickness: 2px;
  text-underline-offset: 7px;
  text-shadow:
    0 0 10px rgba(70, 150, 255, .42),
    0 0 24px rgba(70, 150, 255, .22);
}

.landing-v4-support {
  margin: 16px 0 0;
  color: #6d7890;
  font-size: 14px;
  font-weight: 700;
}

.landing-v4-hero-visual {
  position: relative;
  aspect-ratio: 1.15;
  min-height: 520px;
  isolation: isolate;
}

.landing-v4-hero-visual::before {
  content: "";
  position: absolute;
  inset: 9% 7% 8%;
  z-index: -2;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(7, 89, 217, .12), rgba(7, 89, 217, .035) 58%, transparent 72%);
}

.landing-v4-hero-visual > img {
  position: absolute;
  width: clamp(190px, 20vw, 330px);
  height: auto;
  inset: 50% auto auto 50%;
  transform: translate(-50%, -50%);
  filter: drop-shadow(0 24px 34px rgba(7, 48, 112, .16));
}

.landing-v4-orbit {
  position: absolute;
  inset: 50% auto auto 50%;
  display: block;
  border: 1px solid rgba(7, 89, 217, .3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.landing-v4-orbit--outer {
  width: 82%;
  aspect-ratio: 1;
}

.landing-v4-orbit--inner {
  width: 58%;
  aspect-ratio: 1;
  border-style: dashed;
}

.landing-v4-route {
  position: absolute;
  min-width: 190px;
  padding: 15px 18px;
  display: grid;
  gap: 3px;
  border: 1px solid rgba(188, 207, 239, .92);
  border-radius: 14px;
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 18px 46px rgba(28, 59, 109, .11);
}

.landing-v4-route span {
  color: var(--landing-ink);
  font-size: 17px;
  font-weight: 800;
}

.landing-v4-route small {
  color: var(--landing-muted);
  font-size: 14px;
}

.landing-v4-route--learn {
  top: 7%;
  right: 1%;
}

.landing-v4-route--practise {
  top: 45%;
  left: -1%;
}

.landing-v4-route--review {
  right: 4%;
  bottom: 7%;
}

.landing-v4-next {
  position: absolute;
  right: 50%;
  bottom: 7px;
  width: 68px;
  height: 68px;
  transform: translateX(50%);
  padding: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.landing-v4-next__arrow {
  position: absolute;
  top: calc(50% + 5px);
  left: 50%;
  width: 90px;
  height: 90px;
  max-width: none;
  display: block;
  object-fit: cover;
  mix-blend-mode: multiply;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.landing-v4-section--product .landing-v4-section-grid {
  grid-template-columns: minmax(360px, .82fr) minmax(0, 1.18fr);
  gap: clamp(48px, 6vw, 104px);
}

.landing-v4-section--product .landing-v4-section-grid.is-reversed {
  grid-template-columns: minmax(0, 1.18fr) minmax(360px, .82fr);
}

.landing-v4-section--wide-shot .landing-v4-section-grid {
  grid-template-columns: minmax(390px, .74fr) minmax(0, 1.26fr);
  gap: clamp(42px, 5vw, 84px);
}

.landing-v4-section--wide-shot .landing-v4-section-grid.is-reversed {
  grid-template-columns: minmax(0, 1.26fr) minmax(390px, .74fr);
}

.landing-v4-section--product:not(.landing-v4-section--diagnose) .landing-v4-copy h2 {
  font-size: clamp(44px, 3vw, 56px);
}

.landing-v4-section--diagnose .landing-v4-copy h2 {
  font-size: clamp(54px, 4.9vw, 72px);
}

.landing-v4-section--diagnose .landing-v4-copy > p:not(.landing-v4-eyebrow) {
  font-size: clamp(19px, 1.45vw, 22px);
}

.landing-v4-product-frame {
  width: 100%;
  min-width: 0;
  display: grid;
  place-items: center;
  perspective: 1400px;
}

.landing-v4-product-frame--diagnostic {
  width: min(100%, 620px);
  justify-self: center;
}

.landing-v4-product-shot {
  --tilt-x: 0deg;
  --tilt-y: 0deg;
  --shot-lift: 0px;
  width: 100%;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(164, 187, 223, .72);
  border-radius: 24px;
  background: #f8faff;
  box-shadow: 0 26px 62px rgba(31, 64, 116, .16);
  transform:
    perspective(1400px)
    rotateX(var(--tilt-x))
    rotateY(var(--tilt-y))
    translateY(var(--shot-lift));
  transform-style: preserve-3d;
  transition: box-shadow 300ms ease;
  will-change: transform;
  pointer-events: none;
}

.landing-v4-product-shot.is-near-pointer {
  box-shadow: 0 32px 72px rgba(31, 64, 116, .2);
}

.landing-v4-product-shot img {
  width: 100%;
  height: auto;
  display: block;
  pointer-events: none;
  user-select: none;
}

.landing-v4-section--dark {
  border-color: rgba(74, 115, 186, .35);
  background:
    radial-gradient(circle at 72% 24%, rgba(23, 91, 203, .25), transparent 30%),
    linear-gradient(145deg, #041126, #061b3b 62%, #07152c);
}

.landing-v4-section--dark .landing-v4-copy h2,
.landing-v4-section--dark .landing-v4-copy > p {
  color: #fff;
}

.landing-v4-section--dark .landing-v4-copy > p:not(.landing-v4-eyebrow) {
  color: #b9c7de;
}

.landing-v4-section--dark .landing-v4-eyebrow {
  color: #6fa4ff;
}

.landing-v4-course-layout {
  display: grid;
  gap: clamp(42px, 5vh, 62px);
}

.landing-v4-course-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 48px;
}

.landing-v4-course-head .landing-v4-copy {
  max-width: 900px;
}

.landing-v4-course-head .landing-v4-copy h2 {
  max-width: 900px;
  font-size: clamp(46px, 4vw, 64px);
}

.landing-v4-course-head .landing-v4-copy > p:not(.landing-v4-eyebrow) {
  max-width: 760px;
  margin-top: 18px;
}

.landing-v4-course-head .landing-v4-button {
  margin: 0 0 5px;
}

.landing-v4-unit-proof {
  position: relative;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 30px);
}

.landing-v4-unit-proof::before {
  content: "";
  position: absolute;
  top: 52px;
  right: 7%;
  left: 7%;
  height: 1px;
  background: linear-gradient(90deg, #5795ff, rgba(87, 149, 255, .28) 38%, rgba(87, 149, 255, .12));
}

.landing-v4-unit {
  position: relative;
  min-width: 0;
  display: grid;
  grid-template-rows: 104px auto auto;
  justify-items: center;
  gap: 12px;
  color: #fff;
  text-align: center;
  text-decoration: none;
}

.landing-v4-unit__node {
  position: relative;
  z-index: 1;
  width: 104px;
  height: 104px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(107, 159, 246, .54);
  border-radius: 50%;
  background: #0b2858;
  box-shadow: 0 0 0 8px rgba(6, 24, 54, .92);
  transition: transform 200ms ease, border-color 200ms ease, background-color 200ms ease, box-shadow 200ms ease;
}

.landing-v4-unit__node > b {
  color: #dce9ff;
  font-size: 31px;
  line-height: 1;
}

.landing-v4-unit__copy {
  min-width: 0;
  display: grid;
  justify-items: center;
  gap: 6px;
}

.landing-v4-unit__copy small {
  color: #82adf8;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.2;
}

.landing-v4-unit__copy strong {
  max-width: 190px;
  color: #fff;
  font-size: clamp(17px, 1.15vw, 20px);
  line-height: 1.24;
  text-wrap: balance;
}

.landing-v4-unit__copy em {
  max-width: 190px;
  color: #aebdd5;
  font-size: 15px;
  font-style: normal;
  line-height: 1.38;
}

.landing-v4-unit__status {
  min-height: 27px;
  padding: 5px 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(108, 158, 241, .34);
  border-radius: 999px;
  background: rgba(8, 36, 79, .9);
  color: #a9c7f7;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.2;
}

.landing-v4-unit__lock {
  position: absolute;
  top: -1px;
  right: -1px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(123, 161, 220, .42);
  border-radius: 50%;
  background: #0b1f43;
}

.landing-v4-unit__lock img {
  width: 18px;
  height: 18px;
  display: block;
  object-fit: contain;
  filter: invert(70%) sepia(18%) saturate(1038%) hue-rotate(179deg) brightness(89%) contrast(88%);
}

.landing-v4-unit.is-available {
  cursor: pointer;
}

.landing-v4-unit.is-available .landing-v4-unit__node {
  border-color: #68a4ff;
  background: #0d3475;
  box-shadow: 0 0 0 8px rgba(6, 24, 54, .92), 0 0 28px rgba(73, 142, 255, .2);
}

.landing-v4-unit.is-available .landing-v4-unit__status {
  border-color: rgba(104, 164, 255, .7);
  background: #103a7d;
  color: #fff;
}

.landing-v4-unit.is-available:hover .landing-v4-unit__node,
.landing-v4-unit.is-available:focus-visible .landing-v4-unit__node {
  border-color: #fff;
  background: #1250aa;
  box-shadow: 0 0 0 8px rgba(6, 24, 54, .92), 0 0 0 12px rgba(92, 157, 255, .18), 0 16px 36px rgba(0, 0, 0, .24);
  transform: translateY(-4px);
}

.landing-v4-unit.is-available:focus-visible {
  border-radius: 12px;
  outline: 3px solid #74a9ff;
  outline-offset: 7px;
}

.landing-v4-unit.is-locked {
  cursor: default;
}

.landing-v4-unit.is-locked .landing-v4-unit__node,
.landing-v4-unit.is-locked .landing-v4-unit__copy,
.landing-v4-unit.is-locked .landing-v4-unit__status {
  opacity: .66;
}

.landing-v4-unit.is-locked:focus-visible {
  border-radius: 12px;
  outline: 2px solid #8ca8d2;
  outline-offset: 7px;
}

.landing-v4-unit:not(.is-locked) .landing-v4-unit__lock {
  display: none;
}

.landing-v4-footer {
  position: absolute;
  right: clamp(32px, 5vw, 88px);
  bottom: 20px;
  left: clamp(32px, 5vw, 88px);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: #6b7790;
  font-size: 13px;
}

.landing-v4-footer > span:last-child {
  display: flex;
  gap: 18px;
}

.landing-v4-footer a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.landing-v4-rail {
  position: fixed;
  z-index: 90;
  top: 50%;
  left: clamp(18px, 2.3vw, 42px);
  transform: translateY(-46%);
  display: grid;
  gap: 4px;
}

.landing-v4-rail__line {
  position: absolute;
  top: 19px;
  bottom: 19px;
  left: 7px;
  z-index: -1;
  width: 1px;
  background: #cbd8ec;
}

.landing-v4-rail button {
  min-height: 44px;
  padding: 0;
  display: grid;
  grid-template-columns: 16px auto;
  align-items: center;
  gap: 12px;
  border: 0;
  background: transparent;
  color: #7a869c;
  font: inherit;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  transition: color 180ms ease, transform 180ms ease;
}

.landing-v4-rail button > span {
  width: 15px;
  height: 15px;
  display: block;
  border: 2px solid #b8c6dc;
  border-radius: 50%;
  background: #fff;
  transition: border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.landing-v4-rail button b {
  font-weight: 700;
  white-space: nowrap;
}

.landing-v4-rail button.is-active {
  color: var(--landing-blue);
  transform: translateX(5px);
}

.landing-v4-rail button.is-active b {
  font-size: 14px;
}

.landing-v4-rail button.is-active > span {
  border-color: var(--landing-blue);
  background: var(--landing-blue);
  box-shadow: 0 0 0 5px rgba(7, 89, 217, .12);
}

.landing-v4-rail button.is-complete {
  color: #3d5f94;
}

.landing-v4-rail button.is-complete > span {
  border-color: var(--landing-blue);
  background: var(--landing-blue);
}

.landing-v4-rail button:focus-visible {
  outline: 2px solid var(--landing-blue);
  outline-offset: 4px;
  border-radius: 6px;
}

.landing-v4[data-v4-rail-theme="dark"] .landing-v4-rail__line {
  background: #4a6591;
}

.landing-v4[data-v4-rail-theme="dark"] .landing-v4-rail button {
  color: #aabbd6;
}

.landing-v4[data-v4-rail-theme="dark"] .landing-v4-rail button > span {
  border-color: #7188aa;
  background: #071936;
}

.landing-v4[data-v4-rail-theme="dark"] .landing-v4-rail button.is-active {
  color: #fff;
}

.landing-v4[data-v4-rail-theme="dark"] .landing-v4-rail button.is-active > span,
.landing-v4[data-v4-rail-theme="dark"] .landing-v4-rail button.is-complete > span {
  border-color: #65a0ff;
  background: #2c78eb;
}

.landing-v4-position {
  display: none;
}

.landing-v4-reveal {
  opacity: 0;
  filter: blur(4px);
  transform: translateY(22px);
  transition: opacity 500ms ease, filter 500ms ease, transform 500ms ease;
}

.landing-v4-section.is-visible .landing-v4-reveal {
  opacity: 1;
  filter: blur(0);
  transform: translateY(0);
}

.landing-v4-section.is-visible .landing-v4-reveal:nth-child(2) {
  transition-duration: 600ms;
  transition-delay: 70ms;
}

@media (min-width: 1100px) and (min-height: 700px) and (orientation: landscape) {
  .landing-v4-section {
    height: calc(100dvh - var(--landing-header-height));
    min-height: calc(100dvh - var(--landing-header-height));
  }
}

@media (max-width: 1320px) {
  .landing-v4 .landing-v4-header {
    padding-inline: 32px;
    grid-template-columns: 210px minmax(0, 1fr);
  }

  .landing-v4 .landing-v4-nav {
    grid-column: 2;
    grid-template-columns: minmax(350px, 1fr) auto;
    gap: 26px;
  }

  .landing-v4-brand {
    gap: 9px;
  }

  .landing-v4-brand b {
    font-size: 21px;
  }

  .landing-v4-nav__primary {
    gap: 24px;
  }

  .landing-v4-inner {
    width: min(1180px, calc(100% - 210px));
    margin-left: 170px;
  }

  .landing-v4-section-grid,
  .landing-v4-hero__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 48px;
  }

  .landing-v4-copy h1 {
    font-size: clamp(54px, 5.5vw, 72px);
  }

  .landing-v4-copy h2 {
    font-size: clamp(44px, 4.5vw, 58px);
  }

  .landing-v4-hero-visual {
    min-height: 460px;
  }
}

@media (max-width: 1450px) and (min-width: 1100px) {
  .landing-v4-hero-visual {
    min-height: 430px;
  }
}

@media (max-width: 1099px), (max-height: 699px), (orientation: portrait) {
  .landing-v4 .landing-v4-header {
    position: sticky;
  }

  .landing-v4-main {
    padding-top: 0;
  }

  .landing-v4-section {
    min-height: auto;
    padding: 96px 0;
    overflow: visible;
  }

  .landing-v4-inner {
    width: calc(100% - 64px);
    max-width: 960px;
    min-width: 0;
    margin-inline: auto;
  }

  .landing-v4-section-grid,
  .landing-v4-hero__grid {
    min-width: 0;
    grid-template-columns: 1fr;
  }

  .landing-v4-section--product .landing-v4-section-grid,
  .landing-v4-section--product .landing-v4-section-grid.is-reversed,
  .landing-v4-section--wide-shot .landing-v4-section-grid,
  .landing-v4-section--wide-shot .landing-v4-section-grid.is-reversed {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .landing-v4-desktop-break {
    display: none;
  }

  .landing-v4-copy,
  .landing-v4-hero-visual {
    min-width: 0;
  }

  .landing-v4-product-frame,
  .landing-v4-product-frame--diagnostic {
    width: min(100%, 900px);
    justify-self: center;
  }

  .landing-v4-product-shot,
  .landing-v4-product-shot:hover {
    --shot-lift: 0px;
    transform: none;
    box-shadow: 0 22px 52px rgba(31, 64, 116, .15);
    will-change: auto;
  }

  .landing-v4-section-grid.is-reversed .landing-v4-copy,
  .landing-v4-section-grid.is-reversed > :last-child {
    grid-column: auto;
    grid-row: auto;
  }

  .landing-v4-hero-visual {
    width: min(740px, 100%);
    min-height: 500px;
  }

  .landing-v4-rail {
    display: none;
  }

  .landing-v4-position {
    position: fixed;
    z-index: 89;
    right: 18px;
    bottom: 18px;
    padding: 9px 13px;
    display: flex;
    align-items: baseline;
    gap: 8px;
    border: 1px solid #cbd8ec;
    border-radius: 999px;
    background: rgba(255, 255, 255, .94);
    box-shadow: 0 10px 30px rgba(28, 59, 109, .12);
    color: var(--landing-ink);
    font-size: 13px;
    font-weight: 800;
  }

  .landing-v4-position small {
    color: var(--landing-muted);
    font-size: 11px;
  }

  .landing-v4-next {
    bottom: 14px;
    display: grid;
  }

  .landing-v4-footer {
    position: static;
    width: calc(100% - 64px);
    max-width: 960px;
    margin: 72px auto 0;
  }
}

@media (max-width: 820px) {
  :root {
    --landing-header-height: 66px;
  }

  .landing-v4 .landing-v4-header {
    height: auto;
    min-height: var(--landing-header-height);
    padding: 10px 20px;
    grid-template-columns: 1fr auto;
  }

  .landing-v4-brand {
    gap: 7px;
  }

  .landing-v4-brand img {
    width: 40px;
    height: 40px;
  }

  .landing-v4-brand b {
    font-size: 18px;
  }

  .landing-v4-brand small {
    display: none;
  }

  .landing-v4 .landing-v4-nav {
    grid-column: 2;
    display: flex;
    justify-content: flex-end;
  }

  .landing-v4-nav__primary {
    display: none;
  }

  .landing-v4-nav__account {
    gap: 10px;
  }

  .landing-v4-nav-button {
    min-height: 44px;
    padding: 9px 13px;
    font-size: 13px;
  }

  .landing-v4-inner {
    width: calc(100% - 40px);
    max-width: 680px;
  }

  .landing-v4-section {
    padding: 78px 0;
  }

  .landing-v4-copy h1 {
    font-size: clamp(46px, 13vw, 62px);
  }

  .landing-v4-copy h2 {
    font-size: clamp(38px, 10vw, 50px);
  }

  .landing-v4-section--product:not(.landing-v4-section--diagnose) .landing-v4-copy h2,
  .landing-v4-course-head .landing-v4-copy h2 {
    font-size: clamp(38px, 10vw, 50px);
  }

  .landing-v4-section--diagnose .landing-v4-copy h2 {
    font-size: clamp(40px, 10.5vw, 52px);
  }

  .landing-v4-copy > p:not(.landing-v4-eyebrow, .landing-v4-support),
  .landing-v4-lede {
    font-size: 17px;
  }

  .landing-v4-hero-visual {
    min-height: 430px;
  }

  .landing-v4-route {
    min-width: 155px;
    padding: 12px 14px;
  }

  .landing-v4-route span {
    font-size: 15px;
  }

  .landing-v4-route small {
    font-size: 12px;
  }

  .landing-v4-course-head {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 26px;
  }

  .landing-v4-course-head .landing-v4-button {
    margin: 0;
  }

  .landing-v4-unit-proof {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .landing-v4-unit-proof::before {
    top: 30px;
    bottom: 30px;
    left: 48px;
    width: 1px;
    height: auto;
  }

  .landing-v4-unit {
    grid-template-columns: 96px minmax(0, 1fr) auto;
    grid-template-rows: auto;
    align-items: center;
    justify-items: start;
    gap: 18px;
    text-align: left;
  }

  .landing-v4-unit__node {
    width: 96px;
    height: 96px;
  }

  .landing-v4-unit__copy {
    justify-items: start;
  }

  .landing-v4-unit__copy strong,
  .landing-v4-unit__copy em {
    max-width: none;
  }

  .landing-v4-footer {
    width: calc(100% - 40px);
    max-width: 680px;
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .landing-v4-brand span,
  .landing-v4-position {
    display: none;
  }

  .landing-v4-brand {
    gap: 6px;
  }

  .landing-v4-nav-button.is-secondary {
    display: none;
  }

  .landing-v4-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .landing-v4-hero .landing-v4-actions {
    display: flex;
  }

  .landing-v4-button {
    width: 100%;
  }

  .landing-v4-copy h1 {
    font-size: clamp(44px, 12vw, 52px);
  }

  .landing-v4-copy h2,
  .landing-v4-section--product:not(.landing-v4-section--diagnose) .landing-v4-copy h2,
  .landing-v4-course-head .landing-v4-copy h2,
  .landing-v4-section--diagnose .landing-v4-copy h2 {
    font-size: clamp(36px, 10vw, 42px);
  }

  .landing-v4-highlight-link {
    min-height: 52px;
    font-size: clamp(18px, 5vw, 21px);
  }

  .landing-v4-product-shot {
    border-radius: 16px;
  }

  .landing-v4-hero-visual {
    min-height: 360px;
  }

  .landing-v4-route {
    min-width: 138px;
  }

  .landing-v4-route--learn {
    right: -3%;
  }

  .landing-v4-route--practise {
    left: -3%;
  }

  .landing-v4-unit-proof::before {
    left: 42px;
  }

  .landing-v4-unit {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 14px;
  }

  .landing-v4-unit__node {
    width: 84px;
    height: 84px;
  }

  .landing-v4-unit__status {
    grid-column: 2;
  }
}

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

  .landing-v4-reveal {
    opacity: 1;
    filter: none;
    transform: none;
    transition: none;
  }

  .landing-v4-skip-link,
  .landing-v4-product-shot,
  .landing-v4-unit__node,
  .landing-v4-rail button,
  .landing-v4-rail button > span {
    transition: none;
  }

  .landing-v4-product-shot,
  .landing-v4-product-shot.is-near-pointer {
    --shot-lift: 0px;
    transform: none;
  }
}

@media (hover: none) {
  .landing-v4-product-shot.is-near-pointer {
    --shot-lift: 0px;
    box-shadow: 0 26px 62px rgba(31, 64, 116, .16);
  }
}