.page-about {
  --about-line: rgba(67, 245, 215, .26);
  --about-card: rgba(43, 90, 80, .26);
  background: var(--night-blue);
  color: var(--paper);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(20px, 4vw, 40px);
  background:
    radial-gradient(90% 70% at 88% -6%, rgba(67, 245, 215, .18), transparent 62%),
    linear-gradient(162deg, var(--night-blue) 0%, var(--ink-green) 100%);
  border-bottom: 2px solid var(--about-line);
}

.page-about .about-hero-inner {
  padding-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-hero h1 {
  margin: .32em 0 .44em;
  font-size: clamp(2.4rem, 8.6vw, 5.8rem);
  line-height: .94;
  font-weight: 800;
  letter-spacing: -.045em;
  transform: skewX(-1.5deg);
  color: var(--paper);
}

.page-about .about-lede {
  max-width: 46ch;
  margin: 0;
  color: var(--mist);
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.85;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.4vw, 28px);
  margin-top: clamp(28px, 5vw, 52px);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.6vw, 2.7rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-stat-unit {
  margin-left: 2px;
  font-size: .52em;
  color: var(--cyan);
}

.page-about .about-stat-label {
  font-size: .86rem;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-hero-figure {
  margin: clamp(24px, 4vw, 44px) 0 0;
  border: 2px solid var(--about-line);
  box-shadow: var(--shadow-hard);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-origin {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(48px, 8vw, 100px) 0;
}

.page-about .origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .origin-side {
  border-left: 4px solid var(--ink-green);
  padding-left: 16px;
}

.page-about .origin-mark {
  margin: 10px 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(2.8rem, 7vw, 4.6rem);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.04em;
  color: var(--ink-green);
}

.page-about .origin-side-text {
  margin: 0;
  max-width: 30ch;
  color: var(--gray-green);
  font-size: .98rem;
  line-height: 1.8;
}

.page-about .origin-body h2 {
  margin: 0 0 18px;
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  line-height: 1.15;
  letter-spacing: -.03em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .origin-body p {
  margin: 0 0 16px;
  color: #14403a;
  font-size: 1rem;
  line-height: 1.9;
}

.page-about .origin-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .origin-item {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border: 2px solid var(--ink);
  background: #fff;
  box-shadow: 5px 5px 0 var(--ink);
}

.page-about .origin-item-key {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .1em;
  color: var(--signal);
}

.page-about .origin-item-val {
  font-size: .95rem;
  line-height: 1.75;
  color: #14403a;
}

.page-about .about-versions {
  position: relative;
  padding: clamp(76px, 11vw, 132px) 0 clamp(52px, 8vw, 104px);
  background: linear-gradient(180deg, var(--ink-green) 0%, var(--night-blue) 72%);
  color: var(--paper);
}

.page-about .about-versions::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: clamp(34px, 5vw, 68px);
  background: var(--paper);
  clip-path: polygon(0 0, 100% 0, 0 100%);
  pointer-events: none;
}

.page-about .about-sec-head {
  margin-bottom: clamp(28px, 5vw, 52px);
  max-width: 54ch;
}

.page-about .about-sec-head h2 {
  margin: 10px 0 12px;
  font-size: clamp(1.8rem, 4.6vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -.035em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-sec-note {
  margin: 0;
  color: var(--mist);
  font-size: .98rem;
  line-height: 1.8;
}

.page-about .ver-track {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 36px);
}

.page-about .ver-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .ver-jump {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--about-line);
  color: var(--mist);
  text-decoration: none;
  font-size: .78rem;
  letter-spacing: .06em;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ver-jump-num {
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .ver-jump:hover,
.page-about .ver-jump:focus-visible {
  border-color: var(--cyan);
  background: rgba(67, 245, 215, .12);
  color: var(--paper);
}

.page-about .ver-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
  position: relative;
}

.page-about .ver-stage {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  background: var(--about-card);
  border: 2px solid var(--about-line);
  box-shadow: 6px 6px 0 rgba(3, 23, 20, .55);
  scroll-margin-top: 24px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .ver-stage:hover,
.page-about .ver-stage:focus-within {
  transform: translate(-2px, -3px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-neon);
}

.page-about .ver-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--signal);
}

.page-about .ver-stage h3 {
  margin: 0 0 12px;
  font-size: clamp(1.12rem, 2.4vw, 1.5rem);
  line-height: 1.3;
  letter-spacing: -.015em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .ver-stage p {
  margin: 0 0 14px;
  color: var(--mist);
  font-size: .96rem;
  line-height: 1.85;
}

.page-about .ver-note {
  margin: 0;
  padding-left: 12px;
  border-left: 2px solid var(--amber);
  font-size: .9rem;
  line-height: 1.7;
  color: var(--amber);
}

.page-about .about-method {
  background: var(--paper);
  color: var(--ink);
  padding: clamp(48px, 8vw, 100px) 0;
}

.page-about .method-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .method-copy h2 {
  margin: 10px 0 16px;
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  line-height: 1.14;
  letter-spacing: -.03em;
  font-weight: 800;
  color: var(--ink);
}

.page-about .method-copy > p {
  margin: 0 0 22px;
  color: #14403a;
  font-size: 1rem;
  line-height: 1.9;
}

.page-about .method-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .method-step {
  padding: 16px 0;
  border-top: 2px solid var(--ink);
}

.page-about .method-step-key {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--signal);
}

.page-about .method-step strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1.02rem;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .method-step p {
  margin: 0;
  font-size: .94rem;
  line-height: 1.8;
  color: #14403a;
}

.page-about .method-tail {
  margin: 22px 0 0;
  padding: 12px 14px;
  border-left: 4px solid var(--ink-green);
  background: rgba(6, 59, 50, .06);
  font-size: .92rem;
  line-height: 1.75;
  color: var(--ink-green);
}

.page-about .about-method-figure {
  margin: 0;
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-team {
  background: linear-gradient(200deg, var(--night-blue) 0%, var(--ink-green) 100%);
  color: var(--paper);
  padding: clamp(52px, 8vw, 104px) 0;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .team-copy h2 {
  margin: 10px 0 16px;
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  line-height: 1.14;
  letter-spacing: -.03em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .team-copy > p {
  margin: 0 0 20px;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .team-roles {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .team-role {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--night-blue);
}

.page-about .team-role-key {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .team-role-val {
  font-size: .94rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .team-partners {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--signal);
  font-size: .94rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .team-figure {
  margin: 0;
  border: 2px solid var(--about-line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-close {
  background: var(--ink);
  color: var(--paper);
  border-top: 3px solid var(--cyan);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .close-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .close-copy h2 {
  margin: 10px 0 16px;
  font-size: clamp(1.6rem, 3.8vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -.03em;
  font-weight: 800;
  color: var(--paper);
}

.page-about .close-copy p {
  margin: 0 0 14px;
  max-width: 52ch;
  color: var(--mist);
  font-size: .97rem;
  line-height: 1.85;
}

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

@media (min-width: 720px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .origin-grid {
    grid-template-columns: minmax(0, .58fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ver-track {
    grid-template-columns: 156px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .ver-rail {
    flex-direction: column;
    gap: 8px;
    overflow: visible;
    padding-bottom: 0;
    position: sticky;
    top: 28px;
    align-self: start;
  }

  .page-about .ver-jump {
    width: 100%;
    justify-content: flex-start;
  }

  .page-about .ver-stages {
    padding-left: 42px;
  }

  .page-about .ver-stages::before {
    content: "";
    position: absolute;
    left: 14px;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: linear-gradient(180deg, var(--cyan) 0%, rgba(67, 245, 215, .1) 100%);
  }

  .page-about .ver-stage::before {
    content: "";
    position: absolute;
    left: -33px;
    top: 30px;
    width: 10px;
    height: 10px;
    background: var(--night-blue);
    border: 2px solid var(--cyan);
    transform: rotate(45deg);
  }

  .page-about .ver-stage:nth-child(even) {
    padding-left: clamp(28px, 4vw, 46px);
  }

  .page-about .method-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: clamp(32px, 5vw, 60px);
  }

  .page-about .close-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }

  .page-about .close-actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ver-stage,
  .page-about .ver-jump {
    transition: none;
  }

  .page-about .ver-stage:hover,
  .page-about .ver-stage:focus-within {
    transform: none;
  }
}