/* Opt-in introduction study. The published composition remains the default. */
.home-intro-original { display: contents; }
.home-intro-concept { display: none; }

html[data-intro-study="concept"] .home-intro {
  padding: clamp(4rem, 6.5vw, 7rem) 0 clamp(3rem, 4.5vw, 5rem);
  background: #fff;
  color: #080808;
}

html[data-intro-study="concept"] .home-intro-original,
html[data-intro-study="concept"] .home-chapter#experience {
  display: none;
}

html[data-intro-study="concept"] .home-intro-concept { display: block; }

.intro-concept-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 2rem;
  max-width: none;
  margin-bottom: clamp(2rem, 3.5vw, 3.5rem);
}

.intro-concept-kicker {
  grid-column: 2;
  grid-row: 1;
  max-width: 12em;
  padding-bottom: .45rem;
  font: 500 .875rem/1.5 'Instrument Sans', Arial, sans-serif;
  letter-spacing: .06em;
  text-align: right;
  text-transform: uppercase;
}

.intro-concept-title {
  grid-column: 1;
  grid-row: 1;
  min-width: 0;
  font-family: 'Archivo Study Wide', 'Instrument Sans', Arial, sans-serif;
  font-size: clamp(3rem, 6.8vw, 7rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -.045em;
  text-transform: uppercase;
  text-wrap: balance;
  overflow-wrap: break-word;
}

.intro-concept-media {
  position: relative;
  height: clamp(25rem, 38vw, 40rem);
  margin-inline: var(--gutter);
  overflow: hidden;
  background: #111;
}

.intro-concept-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 52%;
  filter: grayscale(1);
}

.intro-concept-caption {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: clamp(2rem, 5vw, 5rem);
  max-width: none;
  padding-top: clamp(1.75rem, 2.8vw, 3rem);
}

.intro-concept-description {
  max-width: 42em;
  font-size: clamp(1.125rem, 1.45vw, 1.375rem);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: -.01em;
  color: #414141;
  text-wrap: pretty;
}

.intro-concept-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  min-height: 3.25rem;
  max-width: 100%;
  padding: .875rem 1.5rem;
  border: 1px solid #111;
  border-radius: 999px;
  background: #111;
  color: #fff;
  font: 500 1rem/1.4 'Instrument Sans', Arial, sans-serif;
  text-align: center;
  transition: background-color .2s ease, color .2s ease;
}

.intro-concept-link:focus-visible { outline-color: #111; }

/* Only visible on explicit comparison URLs, outside the normal visitor flow. */
.intro-review {
  position: fixed;
  right: max(1.25rem, env(safe-area-inset-right));
  bottom: max(1.25rem, env(safe-area-inset-bottom));
  z-index: 25;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .25rem;
  max-width: calc(100% - 2.5rem);
  padding: .35rem;
  border: 1px solid #ffffff40;
  border-radius: 999px;
  background: #161616;
  box-shadow: 0 .5rem 2rem #0003;
  color: #fff;
}

.intro-review a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: .65rem 1rem;
  border-radius: 999px;
  font-size: .875rem;
  font-weight: 500;
  line-height: 1.3;
  text-align: center;
  overflow-wrap: anywhere;
}

.intro-review a[aria-current="page"] { background: #fff; color: #111; }
.intro-review .intro-review-close { padding-inline: .65rem; font-size: 1.5rem; }
.intro-review a:focus-visible { outline-offset: 2px; }

@media (hover: hover) {
  .intro-concept-link:hover { background: #fff; color: #111; }
  .intro-review a:not([aria-current="page"]):hover { background: #383838; }
}

@media (max-width: 1100px) {
  .intro-concept-heading { display: block; }
  .intro-concept-kicker { max-width: none; margin-bottom: 1.5rem; padding: 0; text-align: left; }
  .intro-concept-caption { align-items: start; }
  .intro-concept-description { max-width: 34em; }
}

@media (max-width: 760px) {
  html[data-intro-study="concept"] .home-intro { padding-block: 3.75rem 3.5rem; }
  .intro-concept-heading { margin-bottom: 2rem; }
  .intro-concept-kicker { margin-bottom: 1.5rem; }
  .intro-concept-title { max-width: 16ch; font-size: clamp(2.5rem, 10.8vw, 4.5rem); line-height: 1.12; }
  .intro-concept-media { height: auto; aspect-ratio: 4/3; margin-inline: 0; }
  .intro-concept-media img { position: absolute; inset: 0; object-position: 58% 52%; }
  .intro-concept-caption { display: block; padding-top: 1.75rem; }
  .intro-concept-description { max-width: 34em; font-size: 1.125rem; }
  .intro-concept-link { margin-top: 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  .intro-concept-link { transition: none; }
}

@media print { .intro-review { display: none; } }