.page-about{
  --about-grid: rgba(74,111,165,.15);
  --about-grid-strong: rgba(74,111,165,.32);
  --about-accent-glow: rgba(255,107,0,.12);

  background-color: var(--color-bg);
  color: var(--color-text);
  overflow-x: hidden;
}

.page-about .about-hero{
  position: relative;
  padding: calc(var(--header-h) + 28px) 0 40px;
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  border-bottom: 2px solid var(--color-accent);
  overflow: hidden;
}

.page-about .about-hero::before{
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46vw;
  max-width: 320px;
  height: 46vw;
  max-height: 320px;
  background: var(--about-accent-glow);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after{
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 18vw;
  height: 6px;
  background: var(--color-data);
  opacity: .5;
  pointer-events: none;
}

.page-about .about-hero .container{
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid{
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .about-hero__copy{
  min-width: 0;
}

.page-about .about-hero h1{
  font-family: var(--font-head);
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1.14;
  margin: 16px 0 18px;
  letter-spacing: .01em;
}

.page-about .about-hero__lead{
  font-size: 16px;
  line-height: 1.72;
  color: var(--color-muted);
  max-width: 50ch;
  margin: 0 0 24px;
}

.page-about .about-hero__stats{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  max-width: 420px;
  margin: 0 0 24px;
}

.page-about .about-hero__stat{
  padding: 14px 12px;
  background: var(--color-panel);
  border-left: 3px solid var(--color-accent);
}

.page-about .about-hero__stat-value{
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-data);
}

.page-about .about-hero__stat-caption{
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-muted);
}

.page-about .about-hero__figure{
  margin: 0;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  box-shadow: 8px 8px 0 rgba(0,0,0,.18);
}

.page-about .about-hero__figure::before{
  content: "";
  display: block;
  height: 4px;
  background: var(--color-accent);
}

.page-about .about-hero__img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__figcaption{
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line);
}

.page-about .about-hero__deco{
  display: none;
}

.page-about .about-hero__coord{
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--about-grid-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--color-muted);
}

.page-about .section-label__index{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 24px;
  padding: 0 8px;
  margin-right: 4px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
}

.page-about .about-purpose{
  padding-top: 64px;
}

.page-about .about-purpose__layout{
  display: grid;
  gap: 28px;
  margin-top: 24px;
}

.page-about .about-purpose__body p{
  color: var(--color-muted);
}

.page-about .about-purpose__side{
  padding: 24px;
  background: var(--color-panel);
  border-left: 3px solid var(--color-accent);
}

.page-about .about-purpose__side-title{
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-about .about-purpose__principles{
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-purpose__principles li{
  position: relative;
  padding: 12px 0 12px 26px;
  border-top: 1px solid var(--about-grid);
  font-size: 15px;
  line-height: 1.55;
}

.page-about .about-purpose__principles li:first-child{
  border-top: 0;
  padding-top: 0;
}

.page-about .about-purpose__principles li::before{
  content: "▸";
  position: absolute;
  left: 4px;
  color: var(--color-data);
  font-family: var(--font-mono);
}

.page-about .about-index{
  margin-top: 64px;
  padding: 48px 0 56px;
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-index__lead{
  max-width: 66ch;
  color: var(--color-muted);
}

.page-about .about-index__process{
  display: grid;
  gap: 28px;
  margin-top: 32px;
}

.page-about .about-index__steps{
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-index__step{
  padding: 20px;
  background: var(--color-panel);
  border-left: 3px solid var(--color-line);
  transition: border-color .2s ease;
}

.page-about .about-index__step:hover,
.page-about .about-index__step:focus-within{
  border-left-color: var(--color-accent);
}

.page-about .about-index__step-num{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--color-data);
}

.page-about .about-index__step h3{
  margin: 8px 0 6px;
  font-size: 17px;
}

.page-about .about-index__step p{
  margin: 0;
  font-size: 14px;
  color: var(--color-muted);
}

.page-about .about-index__note{
  align-self: start;
  padding: 24px;
  background: rgba(15,110,107,.12);
  border: 1px solid var(--color-jade);
}

.page-about .about-index__note-index{
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--color-jade);
  text-transform: uppercase;
}

.page-about .about-cn{
  padding-top: 64px;
}

.page-about .about-cn__layout{
  display: grid;
  gap: 28px;
  margin-top: 24px;
}

.page-about .about-cn__copy p{
  color: var(--color-muted);
}

.page-about .about-cn__capsules{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.page-about .about-cn__figure{
  margin: 0;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  box-shadow: 8px 8px 0 rgba(0,0,0,.18);
}

.page-about .about-cn__figure::before{
  content: "";
  display: block;
  height: 4px;
  background: var(--color-data);
}

.page-about .about-cn__img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-cn__figure figcaption{
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line);
}

.page-about .about-evolution{
  margin-top: 64px;
  padding: 48px 0 56px;
  background: rgba(107,29,58,.18);
  border-top: 1px solid var(--color-wine);
  border-bottom: 1px solid var(--color-wine);
}

.page-about .about-evolution__lead{
  max-width: 68ch;
  color: var(--color-muted);
}

.page-about .about-evolution__list{
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-evolution__item{
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
  padding: 18px 16px;
  background: var(--color-panel);
  border-top: 2px solid var(--color-line);
}

.page-about .about-evolution__item:hover{
  border-top-color: var(--color-accent);
}

.page-about .about-evolution__version{
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-data);
  line-height: 1.4;
}

.page-about .about-evolution__item:last-child .about-evolution__version{
  color: var(--color-amber);
}

.page-about .about-evolution__item h3{
  margin: 0 0 6px;
  font-size: 16px;
}

.page-about .about-evolution__item p{
  margin: 0;
  font-size: 14px;
  color: var(--color-muted);
}

.page-about .about-milestones{
  padding-top: 64px;
}

.page-about .about-milestones__layout{
  display: grid;
  gap: 32px;
  margin-top: 28px;
}

.page-about .about-milestones__list{
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-milestones__list::before{
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 7px;
  width: 1px;
  background: var(--color-line);
}

.page-about .about-milestones__item{
  position: relative;
  padding: 0 0 26px 30px;
}

.page-about .about-milestones__item:last-child{
  padding-bottom: 0;
}

.page-about .about-milestones__marker{
  position: absolute;
  top: 6px;
  left: 3px;
  width: 9px;
  height: 9px;
  background: var(--color-accent);
  transition: transform .2s ease, background .2s ease;
}

.page-about .about-milestones__item:hover .about-milestones__marker{
  transform: scale(1.3);
  background: var(--color-data);
}

.page-about .about-milestones__version{
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-data);
  letter-spacing: .06em;
}

.page-about .about-milestones__item:last-child .about-milestones__version{
  color: var(--color-amber);
}

.page-about .about-milestones__content{
  margin-top: 6px;
}

.page-about .about-milestones__content h3{
  margin: 0 0 6px;
  font-size: 17px;
}

.page-about .about-milestones__content p{
  margin: 0;
  font-size: 14px;
  color: var(--color-muted);
}

.page-about .about-milestones__figure{
  margin: 0;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  box-shadow: 8px 8px 0 rgba(0,0,0,.18);
}

.page-about .about-milestones__figure::before{
  content: "";
  display: block;
  height: 4px;
  background: var(--color-amber);
}

.page-about .about-milestones__img{
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-milestones__figure figcaption{
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line);
}

.page-about .about-cta{
  padding-top: 56px;
  padding-bottom: 72px;
}

.page-about .about-cta__box{
  padding: 28px;
  background:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px),
    var(--color-panel);
  background-size: 32px 32px, 32px 32px, auto;
  border-left: 4px solid var(--color-accent);
}

.page-about .about-cta__label{
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--color-muted);
  margin: 0 0 18px;
}

.page-about .about-cta__links{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 720px){
  .page-about .about-hero{
    padding-bottom: 56px;
  }

  .page-about .about-hero__grid{
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-hero h1{
    font-size: clamp(36px, 5vw, 52px);
  }

  .page-about .about-hero__coord{
    margin-top: 28px;
  }

  .page-about .about-hero__deco{
    display: block;
    position: absolute;
    right: -20px;
    bottom: 8px;
    z-index: 0;
    font-family: var(--font-mono);
    font-size: clamp(56px, 8vw, 104px);
    font-weight: 700;
    line-height: 1;
    color: transparent;
    -webkit-text-stroke: 1px var(--about-grid-strong);
    white-space: nowrap;
    pointer-events: none;
    opacity: .7;
  }

  .page-about .about-purpose__layout{
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-index__process{
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .about-cn__layout{
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .about-evolution__list{
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-milestones__layout{
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-cta__box{
    padding: 36px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
  }

  .page-about .about-cta__label{
    margin: 0;
  }
}