.page-about {
  --about-gap: clamp(24px, 4vw, 56px);
  --about-pad: clamp(48px, 7vw, 88px);
  color: var(--c-body);
  font-family: var(--font-body);
}

.page-about .about-index {
  font-family: var(--font-mono);
  color: var(--c-cyan);
  margin: 0 0 18px;
  letter-spacing: 0.14em;
}

.page-about .about-intro {
  padding: clamp(36px, 6vw, 76px) 0 clamp(20px, 3vw, 36px);
}

.page-about .about-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.1rem, 5.2vw, 4.2rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--c-head);
  margin: 0 0 clamp(28px, 4vw, 44px);
  max-width: 20em;
}

.page-about .about-intro-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-lede {
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--c-body);
  max-width: var(--w-read);
  margin: 0;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  margin: 0;
  padding-top: 24px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-figure-item dt {
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-body);
  margin-bottom: 6px;
}

.page-about .about-figure-item dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1;
  color: var(--c-head);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-figure-item dd span {
  font-size: 13px;
  color: var(--c-cyan);
  letter-spacing: 0.06em;
}

.page-about .about-section {
  padding: var(--about-pad) 0;
  position: relative;
}

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

.page-about .about-sec-index {
  font-family: var(--font-mono);
  color: var(--c-cyan);
  margin: 0 0 10px;
  letter-spacing: 0.14em;
}

.page-about .about-sec-index--time {
  color: var(--c-orange);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--fs-block);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--c-head);
  margin: 0 0 20px;
  max-width: 22em;
}

.page-about .about-p {
  font-size: var(--fs-body);
  line-height: 1.78;
  color: var(--c-body);
  max-width: var(--w-read);
  margin: 0 0 16px;
}

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

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-panel);
  border: 1px solid var(--c-line);
  object-fit: cover;
  background: var(--c-panel);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-body);
}

.page-about .about-origin .about-figure {
  margin-top: clamp(0px, 3vw, 44px);
}

.page-about .about-versions {
  background: linear-gradient(180deg, var(--c-panel) 0%, var(--c-ink) 100%);
}

.page-about .about-figure--wide {
  margin: clamp(24px, 4vw, 40px) 0 clamp(28px, 4vw, 44px);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, var(--c-cyan) 64%, var(--c-line) 100%);
}

.page-about .about-node {
  position: relative;
  padding-left: 40px;
  margin-bottom: 18px;
}

.page-about .about-node:last-child {
  margin-bottom: 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 16px;
  width: 13px;
  height: 13px;
  background: var(--c-cyan);
  transform: rotate(45deg);
  box-shadow: 0 0 0 5px rgba(25, 227, 198, 0.1);
}

.page-about .about-node--next::before {
  background: transparent;
  border: 1px solid var(--c-orange);
  box-shadow: none;
}

.page-about .about-ver {
  background: var(--c-capsule);
  border: 1px solid var(--c-line);
  border-radius: var(--r-panel);
  padding: 16px 20px;
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-about .about-ver[open],
.page-about .about-ver:hover {
  border-color: var(--c-cyan);
}

.page-about .about-ver--next {
  border-color: rgba(255, 122, 41, 0.55);
  background: linear-gradient(135deg, rgba(255, 122, 41, 0.09), rgba(19, 26, 32, 0.9) 62%);
}

.page-about .about-ver > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

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

.page-about .about-ver > summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-body);
  transition: transform var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .about-ver[open] > summary::after {
  transform: rotate(45deg);
  color: var(--c-cyan);
}

.page-about .about-ver-name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-sub);
  line-height: 1.35;
  color: var(--c-head);
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-ver-id {
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-ver-id--now {
  color: var(--c-orange);
}

.page-about .about-ver > p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-body);
  max-width: 62ch;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
}

.page-about .about-role--1 { --bar: 43%; }
.page-about .about-role--2 { --bar: 26%; }
.page-about .about-role--3 { --bar: 14%; }
.page-about .about-role--4 { --bar: 17%; }

.page-about .about-role-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-role-name {
  font-size: 15px;
  color: var(--c-head);
}

.page-about .about-role-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-cyan);
  letter-spacing: 0.04em;
}

.page-about .about-role-track {
  display: block;
  height: 8px;
  margin: 10px 0 8px;
  border-radius: 4px;
  background: var(--c-capsule);
  overflow: hidden;
}

.page-about .about-role-fill {
  display: block;
  height: 100%;
  width: var(--bar);
  background: linear-gradient(90deg, var(--c-data-viz), var(--c-cyan));
  transition: filter var(--t-fast) var(--ease), width var(--t-base) var(--ease);
}

.page-about .about-role:hover .about-role-fill {
  filter: brightness(1.28);
}

.page-about .about-role-note {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--c-body);
}

.page-about .about-audience {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--c-line);
}

.page-about .about-audience li {
  display: grid;
  grid-template-columns: minmax(88px, auto) 1fr;
  gap: 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-audience-key {
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.12em;
  color: var(--c-cyan);
}

.page-about .about-audience-val {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-body);
}

.page-about .about-figure--reach {
  margin-top: clamp(4px, 2vw, 24px);
}

.page-about .about-dots-block {
  margin-top: clamp(28px, 4vw, 48px);
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--c-line);
  border-radius: var(--r-panel);
  background: var(--c-panel);
}

.page-about .about-dots-label {
  font-family: var(--font-mono);
  color: var(--c-data-viz);
  margin: 0 0 18px;
  letter-spacing: 0.14em;
}

.page-about .about-dots {
  display: grid;
  grid-template-columns: repeat(13, minmax(0, 1fr));
  gap: 8px;
}

.page-about .about-dots span {
  display: block;
  aspect-ratio: 1 / 1;
  border-radius: 3px;
  background: var(--c-data-deep);
  border: 1px solid var(--c-line);
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-dots span:nth-child(3n) {
  background: var(--c-data-viz);
  border-color: var(--c-data-viz);
}

.page-about .about-dots span:nth-child(7n) {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .about-dots span:hover {
  background: var(--c-glow);
  border-color: var(--c-glow);
}

.page-about .about-dots-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-body);
  max-width: var(--w-read);
}

.page-about .about-eco-track {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0 0 14px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 78%);
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  outline: none;
}

.page-about .about-eco-track:focus-visible {
  box-shadow: 0 0 0 2px var(--c-glow);
  border-radius: var(--r-panel);
}

.page-about .about-eco-track::-webkit-scrollbar {
  height: 4px;
}

.page-about .about-eco-track::-webkit-scrollbar-track {
  background: var(--c-capsule);
}

.page-about .about-eco-track::-webkit-scrollbar-thumb {
  background: var(--c-data-viz);
  border-radius: 2px;
}

.page-about .about-eco-card {
  scroll-snap-align: start;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--r-panel);
  padding: 22px 20px;
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-about .about-eco-card:hover {
  border-color: var(--c-cyan);
  background: var(--c-capsule);
}

.page-about .about-eco-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 2.6vw, 1.9rem);
  line-height: 1;
  color: var(--c-cyan);
  letter-spacing: -0.02em;
}

.page-about .about-eco-card h3 {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--c-head);
}

.page-about .about-eco-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-body);
}

.page-about .about-work-panel {
  position: relative;
  padding: clamp(24px, 4.5vw, 52px);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(25, 227, 198, 0.1), transparent 58%),
    var(--c-panel);
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 0 100%);
}

.page-about .about-work-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 30px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-orange));
}

.page-about .about-steps {
  list-style: none;
  counter-reset: step;
  margin: clamp(20px, 3vw, 30px) 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-steps li {
  position: relative;
  padding-left: 42px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-body);
}

.page-about .about-steps li::before {
  counter-increment: step;
  content: "0" counter(step);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.2;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  padding: 3px 6px;
  border: 1px solid var(--c-line);
  border-radius: 4px;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  font-size: 14px;
}

.page-about .about-links a {
  color: var(--c-body);
  text-decoration: none;
  border-bottom: 1px solid var(--c-line);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-links a:hover,
.page-about .about-links a:focus-visible {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
}

@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }

  .page-about .about-dots {
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-figures {
    padding-top: 0;
    border-top: none;
    border-left: 1px solid var(--c-line);
    padding-left: 28px;
  }

  .page-about .about-eco-track {
    grid-auto-columns: minmax(0, 1fr);
    overflow-x: visible;
    padding-bottom: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .about-timeline {
    padding-left: 8px;
  }

  .page-about .about-node {
    padding-left: 48px;
  }

  .page-about .about-node::before {
    left: 7px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role-fill,
  .page-about .about-ver,
  .page-about .about-ver > summary::after,
  .page-about .about-eco-card,
  .page-about .about-links a {
    transition: none;
  }
}