:root {
  --model-motion: 760ms var(--ease);
  --model-line: color-mix(in srgb, currentColor 18%, transparent);
  --model-line-strong: color-mix(in srgb, currentColor 42%, transparent);
  --model-active: var(--blue);
}

#p02,
#p03 {
  min-height: 100vh;
}

.model-overview {
  min-height: calc(100vh - var(--nav) - 98px);
  display: grid;
  grid-template-columns: minmax(280px, .72fr) minmax(620px, 1.28fr);
  gap: clamp(58px, 7vw, 132px);
  align-items: center;
}

.model-intro .kicker,
.model-focus__header .kicker {
  color: var(--model-active);
}

.model-intro h2 {
  max-width: 560px;
  font-size: clamp(48px, 5.3vw, 96px);
  line-height: .94;
  letter-spacing: -.055em;
  font-weight: 400;
}

.model-intro__copy {
  max-width: 430px;
  margin-top: 34px;
  font-size: var(--body);
  line-height: 1.65;
  color: var(--muted);
}

.model-logic {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: clamp(24px, 3vw, 54px);
  align-items: stretch;
}

.model-axis {
  display: grid;
  grid-template-rows: auto 1fr auto;
  justify-items: center;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .15em;
  writing-mode: vertical-rl;
}

.model-axis i {
  width: 1px;
  height: 100%;
  margin: 16px 0;
  background: var(--model-line-strong);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 1100ms var(--ease) 160ms;
}

#p02.is-model-visible .model-axis i {
  transform: scaleY(1);
}

.model-layers {
  margin: 0;
  padding: 0;
  list-style: none;
}

.model-layer {
  min-height: 164px;
  display: grid;
  grid-template-columns: 54px minmax(240px, .8fr) minmax(290px, 1.2fr);
  gap: clamp(20px, 2.2vw, 44px);
  align-items: center;
  border-bottom: 1px solid var(--model-line);
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--model-motion),
    transform var(--model-motion);
  transition-delay: calc(var(--step) * 180ms + 180ms);
}

.model-layer:first-child {
  border-top: 1px solid var(--model-line);
}

#p02.is-model-visible .model-layer {
  opacity: 1;
  transform: none;
}

.model-layer__number {
  color: var(--model-active);
  font-size: 13px;
  letter-spacing: .12em;
}

.model-layer__label {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--muted);
}

.model-layer h3 {
  margin-top: 8px;
  font-size: clamp(30px, 3vw, 52px);
  line-height: 1;
  font-weight: 400;
  letter-spacing: -.035em;
}

.model-layer__question {
  max-width: 470px;
  font-size: var(--body);
  line-height: 1.55;
}

.model-focus {
  min-height: calc(100vh - var(--nav) - 98px);
  display: grid;
  grid-template-rows: auto 1fr;
  gap: clamp(38px, 6vh, 74px);
}

.model-focus__header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--model-motion), transform var(--model-motion);
}

#p03.is-model-visible .model-focus__header {
  opacity: 1;
  transform: none;
}

.model-focus__header h2 {
  font-size: clamp(28px, 3vw, 52px);
  font-weight: 400;
  letter-spacing: -.035em;
}

.model-focus__header span {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .15em;
}

.model-focus__body {
  display: grid;
  grid-template-columns: minmax(330px, .72fr) minmax(560px, 1.28fr);
  gap: clamp(62px, 9vw, 170px);
  align-items: stretch;
}

.model-focus__tabs {
  display: grid;
  align-content: center;
}

.model-focus__tab {
  appearance: none;
  width: 100%;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 18px;
  align-items: center;
  padding: 24px 0;
  border: 0;
  border-bottom: 1px solid var(--model-line);
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  opacity: .34;
  transition: opacity 420ms var(--ease), transform 520ms var(--ease);
}

.model-focus__tab:first-child {
  border-top: 1px solid var(--model-line);
}

.model-focus__tab:hover,
.model-focus__tab:focus-visible,
.model-focus__tab.is-active {
  opacity: 1;
}

.model-focus__tab:focus-visible {
  outline: 2px solid var(--model-active);
  outline-offset: 6px;
}

.model-focus__tab.is-active {
  transform: translateX(12px);
}

.model-focus__tab b {
  color: var(--model-active);
  font-size: 12px;
  letter-spacing: .13em;
}

.model-focus__tab span {
  font-size: clamp(19px, 1.5vw, 28px);
}

.model-focus__stage {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-left: clamp(28px, 4vw, 72px);
  border-left: 1px solid var(--model-line-strong);
  opacity: 0;
  transform: translateX(34px);
  transition:
    opacity var(--model-motion) 160ms,
    transform var(--model-motion) 160ms;
}

#p03.is-model-visible .model-focus__stage {
  opacity: 1;
  transform: none;
}

.model-focus__stage.is-changing .model-focus__content {
  opacity: 0;
  transform: translateY(18px);
}

.model-focus__content {
  opacity: 1;
  transform: none;
  transition: opacity 260ms var(--ease), transform 360ms var(--ease);
}

.model-focus__level {
  color: var(--model-active);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.model-focus__answer {
  margin-top: 18px;
  font-size: clamp(72px, 8vw, 146px);
  line-height: .88;
  letter-spacing: -.065em;
  font-weight: 400;
}

.model-focus__meaning {
  max-width: 660px;
  margin-top: 38px;
  font-size: clamp(18px, 1.35vw, 25px);
  line-height: 1.6;
}

.model-focus__question {
  max-width: 620px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.model-focus__progress {
  position: absolute;
  left: 0;
  top: 0;
  width: 2px;
  height: 33.333%;
  background: var(--model-active);
  transform: translateY(calc(var(--active-layer, 0) * 100%));
  transition: transform 620ms var(--ease);
}

@media (max-width: 1100px) {
  .model-overview,
  .model-focus__body {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .model-overview {
    align-content: center;
  }

  .model-intro__copy {
    margin-top: 18px;
  }

  .model-layer {
    min-height: 128px;
    grid-template-columns: 44px minmax(190px, .7fr) 1.3fr;
  }

  .model-focus {
    gap: 26px;
  }

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

  .model-focus__tab,
  .model-focus__tab:first-child {
    border-top: 1px solid var(--model-line);
  }

  .model-focus__stage {
    min-height: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .model-axis i,
  .model-layer,
  .model-focus__header,
  .model-focus__stage,
  .model-focus__content,
  .model-focus__tab,
  .model-focus__progress {
    transition: none;
  }

  .model-axis i,
  .model-layer,
  .model-focus__header,
  .model-focus__stage {
    opacity: 1;
    transform: none;
  }
}