.page-about {
  --about-hair: rgba(217, 210, 190, .2);
  --about-hair-soft: rgba(217, 210, 190, .1);
  --about-gap: clamp(18px, 3vw, 32px);
  color: var(--chalk);
}

.page-about a {
  color: var(--lime-600);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 203, 30, .35);
  transition: color .18ms linear, border-color .18ms linear;
}

.page-about a:hover {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--lime-400);
  outline-offset: 3px;
}

/* ---------- 面包屑 ---------- */

.page-about .breadcrumbs {
  padding-top: clamp(14px, 2.4vw, 24px);
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel-600);
}

.page-about .breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  color: var(--steel-600);
}

.page-about .breadcrumbs__item a {
  border-bottom-color: transparent;
  color: var(--muted);
}

.page-about .breadcrumbs__item a:hover {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--chalk);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: min(58vw, 620px);
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(200, 255, 61, .16), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4.5vw, 48px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 6.6vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: .01em;
  color: var(--chalk);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-roster {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}

.page-about .about-roster__cell {
  display: grid;
  gap: 2px;
  padding: clamp(14px, 2vw, 20px);
  background: var(--ink-800);
}

.page-about .about-roster .score__value {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
}

.page-about .about-roster .score__label {
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 分隔线 ---------- */

.page-about .about-seam {
  height: 1px;
  margin: 0;
  border: 0;
  background-image: repeating-linear-gradient(90deg, var(--about-hair) 0 12px, transparent 12px 24px);
}

/* ---------- 通用小标题 ---------- */

.page-about .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 6px 14px;
  margin: 0 0 clamp(20px, 3vw, 34px);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .section-head__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--lime-400);
}

.page-about .section-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.4vw, 2.15rem);
  line-height: 1.15;
  letter-spacing: .02em;
  color: var(--chalk);
}

.page-about .section-head__meta {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--steel-600);
}

/* ---------- 01 三张桌子 ---------- */

.page-about .about-rail {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-rail .index-list {
  border-top: 1px solid var(--about-hair-soft);
}

.page-about .about-rail__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .desk-stack {
  display: grid;
  gap: 1px;
  background: var(--about-hair-soft);
  border: 1px solid var(--about-hair-soft);
}

.page-about .desk {
  position: relative;
  display: grid;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px) clamp(16px, 2.4vw, 28px);
  padding-left: clamp(24px, 3vw, 34px);
  background: var(--ink-800);
}

.page-about .desk::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--lime-400);
}

.page-about .desk:nth-child(2)::before {
  background: var(--alert-500);
}

.page-about .desk:nth-child(3)::before {
  background: var(--lime-600);
}

.page-about .desk__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--steel-600);
}

.page-about .desk__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  letter-spacing: .03em;
  color: var(--chalk);
}

.page-about .desk__body {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .desk__facts {
  display: grid;
  gap: 6px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .desk__facts li {
  position: relative;
  padding-left: 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--paper-300);
}

.page-about .desk__facts li::before {
  content: "";
  position: absolute;
  top: .62em;
  left: 0;
  width: 8px;
  height: 1px;
  background: var(--lime-400);
}

/* ---------- 02 流程阶梯 ---------- */

.page-about .flow-grid {
  align-items: start;
}

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

.page-about .flow__step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 2px 14px;
  padding: 16px 0;
  border-top: 1px dashed var(--about-hair);
}

.page-about .flow__step:last-child {
  border-bottom: 1px dashed var(--about-hair);
}

.page-about .flow__no {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--alert-500);
}

.page-about .flow__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 1.8vw, 1.25rem);
  letter-spacing: .03em;
  color: var(--chalk);
}

.page-about .flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .flow-figure {
  margin: 0;
  position: sticky;
  top: 96px;
}

/* ---------- 图片通用 ---------- */

.page-about .figure {
  margin: 0;
  display: grid;
  gap: 10px;
}

.page-about .figure__frame {
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: var(--ink-700);
}

.page-about .figure__frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: var(--ratio-figure);
  object-fit: cover;
}

.page-about .figure--4x3 .figure__frame img {
  aspect-ratio: 4 / 3;
}

.page-about .figure__cap {
  font-size: 12.5px;
  line-height: 1.75;
  letter-spacing: .02em;
  color: var(--steel-600);
}

/* ---------- 03 版本阶梯 ---------- */

.page-about .version-figure {
  margin-bottom: clamp(22px, 3.5vw, 40px);
}

.page-about .stairs {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: stair;
}

.page-about .story-node {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 0 16px;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .story-node:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .story-node__mark {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 20px;
}

.page-about .story-node__mark::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--about-hair-soft);
}

.page-about .story-node__no {
  position: relative;
  z-index: 1;
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--lime-400);
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--lime-400);
}

.page-about .story-node:nth-child(2n) .story-node__no {
  border-color: var(--alert-500);
  color: var(--alert-500);
}

.page-about .story-node__main {
  padding: 14px 0 18px;
  min-width: 0;
}

.page-about .story-node__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 4px 14px;
  width: 100%;
  padding: 6px 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.page-about .story-node__ver {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel-600);
}

.page-about .story-node__title {
  grid-column: 1;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 2.4vw, 1.55rem);
  line-height: 1.25;
  letter-spacing: .02em;
  color: var(--chalk);
}

.page-about .story-node__chev {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  position: relative;
  width: 14px;
  height: 14px;
}

.page-about .story-node__chev::before,
.page-about .story-node__chev::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 14px;
  height: 1px;
  background: var(--lime-400);
  transition: transform .2s linear;
}

.page-about .story-node__chev::after {
  transform: rotate(90deg);
}

.page-about .story-node__head[aria-expanded="false"] .story-node__chev::after {
  transform: rotate(0deg);
}

.page-about .story-node__body p {
  margin: 8px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .stairs .story-node:nth-child(2) {
  padding-left: 0;
}

@media (min-width: 860px) {
  .page-about .stairs .story-node:nth-child(2) { margin-left: 12px; }
  .page-about .stairs .story-node:nth-child(3) { margin-left: 26px; }
  .page-about .stairs .story-node:nth-child(4) { margin-left: 40px; }
  .page-about .stairs .story-node:nth-child(5) { margin-left: 56px; }
}

/* ---------- 04 口径边界 ---------- */

.page-about .edges {
  display: grid;
  gap: 1px;
  background: var(--about-hair-soft);
  border: 1px solid var(--about-hair-soft);
}

.page-about .edge {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--ink-800);
}

.page-about .edge::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--lime-400);
}

.page-about .edge--out::before {
  background: var(--alert-500);
}

.page-about .edge__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  letter-spacing: .04em;
  color: var(--chalk);
}

.page-about .edge__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .edge__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .edge__list li::before {
  content: "";
  position: absolute;
  top: .72em;
  left: 0;
  width: 10px;
  height: 1px;
  background: var(--lime-600);
}

.page-about .edge--out .edge__list li::before {
  background: var(--alert-500);
}

.page-about .lens-section {
  margin-top: clamp(28px, 4.5vw, 52px);
}

.page-about .lens-grid {
  display: grid;
  gap: 1px;
  margin-top: 18px;
  background: var(--about-hair-soft);
  border: 1px solid var(--about-hair-soft);
}

.page-about .lens {
  position: relative;
  display: grid;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink-700);
}

.page-about .lens__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--lime-400);
}

.page-about .lens__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  letter-spacing: .03em;
  color: var(--chalk);
}

.page-about .lens__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .lens__fields {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 2px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 05 协作与署名 ---------- */

.page-about .credits-grid {
  align-items: start;
}

.page-about .credits-copy {
  display: grid;
  gap: 18px;
}

.page-about .credits-lead {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .credits-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .credits-list li {
  padding: 16px 0;
  border-bottom: 1px dashed var(--about-hair);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .credits-list__key {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--lime-400);
}

.page-about .credits-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .credits-figure .figure__frame img {
  aspect-ratio: 3 / 4;
}

/* ---------- 06 继续往下走 ---------- */

.page-about .about-next {
  padding-bottom: clamp(48px, 8vw, 110px);
}

.page-about .next-links {
  display: grid;
  gap: 1px;
  background: var(--about-hair-soft);
  border: 1px solid var(--about-hair-soft);
}

.page-about .next-link {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 2px 12px;
  padding: clamp(16px, 2.2vw, 22px) clamp(16px, 2.4vw, 26px);
  background: var(--ink-800);
  border-bottom: 0;
  transition: background .2s linear;
}

.page-about .next-link:hover {
  background: var(--ink-700);
  border-bottom-color: transparent;
}

.page-about .next-link__idx {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel-600);
}

.page-about .next-link__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.02rem, 1.9vw, 1.22rem);
  letter-spacing: .03em;
  color: var(--chalk);
}

.page-about .next-link:hover .next-link__title {
  color: var(--lime-400);
}

.page-about .next-link__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */

@media (min-width: 760px) {
  .page-about .edges {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .6fr);
    align-items: end;
  }

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

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

@media (min-width: 1080px) {
  .page-about .about-roster {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .page-about .about-roster {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .story-node {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 0 12px;
  }

  .page-about .story-node__no {
    width: 28px;
    height: 28px;
    font-size: 11px;
  }

  .page-about .flow-figure {
    position: static;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-link,
  .page-about .story-node__chev::before,
  .page-about .story-node__chev::after {
    transition: none;
  }
}
<<<END>>>