.page-about {
  --about-measure: 64ch;
  color: var(--paper);
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(18px, 4vw, 36px) 0 clamp(42px, 7vw, 88px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -18%;
  width: min(88vw, 760px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%, rgba(61, 245, 200, 0.16), rgba(123, 97, 255, 0.12) 46%, transparent 72%);
  filter: blur(12px);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 15ch;
  font-size: clamp(34px, 7.4vw, 94px);
  font-weight: 200;
  line-height: 1.04;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin-top: clamp(18px, 3vw, 28px);
  max-width: 56ch;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: clamp(30px, 5vw, 54px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-stats li {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .hero-stats__num {
  display: block;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.1;
  color: var(--mint);
}

.page-about .hero-stats__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .chapter-track {
  margin-bottom: clamp(8px, 2vw, 18px);
}

.page-about .chapter {
  border-top: 1px solid var(--line);
}

.page-about .chapter__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(40px, 7vw, 84px) 0;
}

.page-about .chapter__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(40px, 12vw, 68px);
  font-weight: 200;
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: var(--raise);
  user-select: none;
}

.page-about .chapter__body {
  min-width: 0;
  max-width: var(--about-measure);
}

.page-about .chapter__body::after {
  content: "";
  display: block;
  clear: both;
}

.page-about .chapter__body h2 {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-size: clamp(26px, 4vw, 44px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .chapter__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(242, 247, 250, 0.84);
}

.page-about .chapter__body p + p {
  margin-top: 15px;
}

.page-about .inline-link {
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 245, 200, 0.45);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .chapter__figure {
  margin: 0 0 20px;
}

.page-about .chapter__figure figcaption {
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .chapter__figure--archive {
  max-width: 320px;
  margin: 26px auto 0;
}

.page-about .growth {
  display: grid;
  gap: 0;
  margin: 22px 0;
  padding: 0;
}

.page-about .growth__row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.page-about .growth__row:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .growth__row dt {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--mint);
}

.page-about .growth__row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 247, 250, 0.8);
}

.page-about .timeline {
  margin: 26px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--mint), var(--violet) 58%, var(--orange));
  opacity: 0.5;
}

.page-about .vnode {
  position: relative;
  padding-bottom: 16px;
}

.page-about .vnode::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 9px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--line);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .vnode[open]::before {
  border-color: var(--mint);
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(61, 245, 200, 0.14);
}

.page-about .vnode summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 10px;
  padding: 4px 0 8px;
  cursor: pointer;
  list-style: none;
}

.page-about .vnode summary::-webkit-details-marker {
  display: none;
}

.page-about .vnode summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--muted);
}

.page-about .vnode[open] summary::after {
  content: "–";
  color: var(--mint);
}

.page-about .vnode summary:hover .vnode__name,
.page-about .vnode summary:focus-visible .vnode__name {
  color: var(--orange);
}

.page-about .vnode__year {
  font-family: var(--font-mono);
  font-size: clamp(19px, 3vw, 26px);
  line-height: 1;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .vnode__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

.page-about .vnode__body {
  padding: 2px 0 6px;
}

.page-about .vnode__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 247, 250, 0.78);
}

.page-about .eco {
  display: grid;
  gap: 28px;
  margin: 26px 0;
}

.page-about .eco-ring {
  position: relative;
  width: min(100%, 320px);
  aspect-ratio: 1;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(16, 38, 59, 0.9), rgba(6, 16, 29, 0) 72%);
}

.page-about .eco-ring::before {
  content: "";
  position: absolute;
  inset: 21%;
  border: 1px dashed rgba(147, 168, 186, 0.35);
  border-radius: 50%;
}

.page-about .eco-ring__core {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  text-align: center;
  pointer-events: none;
}

.page-about .eco-ring__core-num {
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1;
  color: var(--mint);
}

.page-about .eco-ring__core small {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
}

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

.page-about .eco-ring__node {
  position: absolute;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  width: max-content;
  text-align: center;
}

.page-about .eco-ring__node:nth-child(1) {
  left: 50%;
  top: 4%;
}

.page-about .eco-ring__node:nth-child(2) {
  left: 92%;
  top: 34%;
}

.page-about .eco-ring__node:nth-child(3) {
  left: 74%;
  top: 92%;
}

.page-about .eco-ring__node:nth-child(4) {
  left: 26%;
  top: 92%;
}

.page-about .eco-ring__node:nth-child(5) {
  left: 8%;
  top: 34%;
}

.page-about .eco-ring__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(61, 245, 200, 0.14);
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .eco-ring__name {
  font-size: 11.5px;
  line-height: 1.35;
  color: var(--muted);
  transition: color 0.2s var(--ease);
}

.page-about .eco-ring__node:hover .eco-ring__dot {
  transform: scale(1.5);
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.16);
}

.page-about .eco-ring__node:hover .eco-ring__name {
  color: var(--paper);
}

.page-about .eco-notes {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .eco-notes li {
  padding: 12px 0 12px 14px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(242, 247, 250, 0.8);
}

.page-about .eco-notes strong {
  color: var(--paper);
  font-weight: 700;
}

.page-about .promise {
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .promise__item {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .promise__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-about .promise__item h3 {
  margin: 8px 0 8px;
  font-size: clamp(20px, 2.8vw, 27px);
  font-weight: 800;
  line-height: 1.25;
}

.page-about .promise__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 247, 250, 0.8);
}

.page-about .about-next {
  padding: clamp(36px, 6vw, 72px) 0 clamp(48px, 8vw, 96px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__title {
  margin: 0 0 20px;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
}

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

.page-about .about-next__list a {
  display: block;
  padding: 16px 0 16px 22px;
  position: relative;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  text-decoration: none;
  border-top: 1px solid var(--line);
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.page-about .about-next__list li:last-child a {
  border-bottom: 1px solid var(--line);
}

.page-about .about-next__list a::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mint);
  transition: color 0.2s var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--mint);
  padding-left: 28px;
}

.page-about .about-next__list a:hover::before {
  color: var(--orange);
}

@media (min-width: 720px) {
  .page-about .chapter__figure--float {
    float: right;
    width: clamp(220px, 34%, 330px);
    margin: 6px 0 22px 26px;
  }

  .page-about .growth__row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
  }

  .page-about .promise {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 28px;
  }
}

@media (min-width: 900px) {
  .page-about .chapter__inner {
    grid-template-columns: 160px minmax(0, 1fr) 88px;
    column-gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .chapter__no {
    position: sticky;
    top: 96px;
    font-size: clamp(56px, 6vw, 76px);
  }

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

  .page-about .eco-ring {
    width: min(100%, 340px);
  }
}

@media (min-width: 1040px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .promise {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .vnode::before,
  .page-about .vnode__name,
  .page-about .eco-ring__dot,
  .page-about .eco-ring__name,
  .page-about .about-next__list a,
  .page-about .about-next__list a::before {
    transition: none;
  }
}
<<<END>>>