/* About page — three full-viewport sections, document scroll */

.about-page {
  --about-gutter: 72px;
  --about-gutter-mobile: 14px;
  --about-text-max: 576px;
  --about-gap: 40px;
  --about-art-slot: min(75.2vw, 420px);
  --about-photo-width: clamp(210px, 25vw, 360px);
}

html:has(body.about-page) {
  scroll-snap-type: y proximity;
  overflow-x: clip;
}

body.about-page {
  overflow-x: clip;
}

.about-shell {
  max-width: 1400px;
  margin: 0 auto;
  background-color: var(--rubin-ivory);
}

.about-page .chapter-header {
  padding: 0 22px;
  height: 60px;
  box-sizing: border-box;
}

.about-main {
  background-color: var(--rubin-ivory);
  overflow: visible;
}

.about-copy,
.about-copy p {
  font-family: var(--font-family-code) !important;
  font-weight: 300;
  line-height: var(--line-height-base);
  letter-spacing: var(--letter-spacing-base);
  font-size: 15px;
}

.about-copy p {
  margin: 0 0 1em;
}

.about-copy p:last-child {
  margin-bottom: 0;
}

/* --- Shared section rhythm --- */

.about-section {
  position: relative;
  box-sizing: border-box;
  min-height: 100vh;
  scroll-snap-align: start;
  scroll-snap-stop: normal;
  overflow: visible;
}

.about-copy {
  color: var(--text-color);
  max-width: var(--about-text-max);
}

.about-section:not(.about-section--bio) .about-copy {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--motion-slow) var(--motion-ease-standard),
    transform var(--motion-slow) var(--motion-ease-standard);
}

.about-section.is-visible .about-copy,
.about-section--bio .about-copy {
  opacity: 1;
  transform: translateY(0);
}

.about-photo {
  margin: 0;
  pointer-events: none;
}

.about-photo img {
  display: block;
  width: 100%;
}

/* --- Split sections: text left, photo right --- */

.about-section--intro,
.about-section--craft {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--about-gap);
  padding-inline: var(--about-gutter);
}

.about-section--intro::after,
.about-section--craft::after {
  content: '';
  display: block;
  width: var(--about-art-slot);
  flex-shrink: 0;
  visibility: hidden;
  pointer-events: none;
}

.about-section--intro .about-copy,
.about-section--craft .about-copy {
  position: relative;
  z-index: 2;
  width: 100%;
}

.about-section--intro .about-photo,
.about-section--craft .about-photo {
  position: absolute;
  top: 50%;
  right: calc(50% - 50vw);
  width: var(--about-photo-width);
  aspect-ratio: 3 / 4;
  overflow: hidden;
  z-index: 2;
  transform: translateY(calc(-50% + 18px)) scale(0.985);
  transition:
    opacity var(--motion-slow) var(--motion-ease-standard) 80ms,
    transform var(--motion-slow) var(--motion-ease-standard) 80ms;
}

.about-section--intro.is-visible .about-photo,
.about-section--craft.is-visible .about-photo {
  transform: translateY(-50%) scale(1);
}

.about-section--intro .about-photo img,
.about-section--craft .about-photo img {
  height: 100%;
  object-fit: cover;
  object-position: center center;
}

/* --- Craft: generative tree as full-bleed background --- */

.about-section--craft .about-stage {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(50% - 50vw);
  width: 100vw;
  min-height: 100vh;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.about-tree-canvas {
  width: 100%;
  height: 100%;
  display: block;
  border: none;
  background: transparent;
  touch-action: pan-y;
  pointer-events: none;
}

/* --- Bio: centered copy only --- */

.about-section--bio {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-inline: var(--about-gutter);
  text-align: center;
}

.about-section--bio .about-copy {
  flex: 0 1 var(--about-text-max);
  width: min(var(--about-text-max), 100%);
}

/* --- Mobile: three viewport pages, document scroll --- */

@media (max-width: 1024px) {
  .about-page {
    --about-gutter: var(--about-gutter-mobile);
    --about-gap: 20px;
    --about-photo-width: clamp(154px, 34vw, 240px);
  }

  html:has(body.about-page) {
    scroll-snap-type: y mandatory;
  }

  body.about-page {
    overflow-x: clip;
  }

  .about-section {
    height: 100dvh;
    min-height: 100dvh;
    max-height: 100dvh;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    overflow: hidden;
    padding: var(--about-gutter-mobile);
    box-sizing: border-box;
  }

  .about-section--intro::after,
  .about-section--craft::after {
    display: none;
  }

  .about-section:not(.about-section--bio) .about-copy,
  .about-section--intro .about-photo,
  .about-section--craft .about-photo {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .about-section--intro .about-copy,
  .about-section--craft .about-copy,
  .about-section--bio .about-copy {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: none;
    font-size: 14px;
    padding: 0;
    box-sizing: border-box;
    overflow-wrap: anywhere;
  }

  /* Split sections — copy on top; photo fills remaining space */
  .about-section--intro,
  .about-section--craft {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 0;
  }

  .about-section--intro .about-copy,
  .about-section--craft .about-copy {
    flex-shrink: 0;
    padding: var(--about-gutter-mobile);
    padding-bottom: var(--about-gap);
  }

  .about-section--intro .about-photo,
  .about-section--craft .about-photo {
    position: relative;
    top: auto;
    right: auto;
    flex: 1 1 auto;
    width: 100%;
    min-height: 0;
    aspect-ratio: auto;
    margin: 0;
    padding: 0 var(--about-gutter-mobile) var(--about-gutter-mobile);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }

  .about-section--intro .about-photo img,
  .about-section--craft .about-photo img {
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    object-position: center center;
  }

  .about-section--intro.is-visible .about-photo,
  .about-section--craft.is-visible .about-photo {
    transform: none;
  }

  .about-section--craft .about-stage {
    position: absolute;
    inset: 0;
    left: 0;
    width: 100%;
    min-height: 100%;
    z-index: 0;
  }

  .about-section--craft .about-photo {
    display: none;
  }

  /* Section 3 — centered bio */
  .about-section--bio {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--about-gutter-mobile);
    text-align: center;
  }

  .about-section--bio .about-copy {
    text-align: center;
    margin-inline: auto;
    max-width: 34rem;
  }
}

@media (max-width: 767px) {
  .about-page {
    --about-photo-width: clamp(140px, 40vw, 200px);
  }
}

@media (prefers-reduced-motion: reduce) {
  html:has(body.about-page) {
    scroll-behavior: auto !important;
    scroll-snap-type: none;
  }

  .about-section .about-copy,
  .about-section--intro .about-photo,
  .about-section--craft .about-photo {
    transition: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
}