.page-about {
  background: var(--abyss-900);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 2px solid var(--line-2);
  background: var(--abyss-900);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .42;
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(112deg, rgba(7, 14, 28, .97) 0%, rgba(7, 14, 28, .86) 42%, rgba(7, 14, 28, .34) 100%),
    repeating-linear-gradient(90deg, rgba(107, 124, 147, .10) 0 1px, transparent 1px 96px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 52px) var(--gutter) clamp(40px, 7vw, 84px);
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(24px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(32px, 6.2vw, 68px);
  line-height: .98;
  letter-spacing: -.025em;
  font-weight: 900;
  color: var(--mist-050);
  text-wrap: balance;
}

.page-about .about-hero__desc {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--ink-dim);
}

.page-about .hero-facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 2px solid var(--line-2);
  background: rgba(14, 26, 48, .78);
}

.page-about .hero-facts > div {
  padding: 16px 16px 15px;
  border-right: 1px solid var(--line-1);
  border-bottom: 1px solid var(--line-1);
}

.page-about .hero-facts > div:nth-child(2n) {
  border-right: 0;
}

.page-about .hero-facts > div:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.page-about .hero-facts dt {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink-mute);
}

.page-about .hero-facts dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(36px, 6vw, 68px) var(--gutter) clamp(48px, 7vw, 96px);
}

/* ---------- 左侧刻度带 ---------- */
.page-about .about-rail {
  display: none;
}

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

.page-about .rail-list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line-2);
}

.page-about .rail-link {
  position: relative;
  display: block;
  padding-left: 24px;
  text-decoration: none;
  color: var(--ink-mute);
  transition: color .18s var(--ease);
}

.page-about .rail-link::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 8px;
  height: 8px;
  box-sizing: border-box;
  border: 2px solid var(--slate-400);
  background: var(--abyss-900);
  transition: border-color .18s var(--ease), background-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--mist-050);
}

.page-about .rail-link:hover::before,
.page-about .rail-link:focus-visible::before {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 243, 214, .16);
}

.page-about .rail-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .rail-label {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  letter-spacing: .1em;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(36px, 6vw, 78px) 0;
  border-top: 2px solid var(--line-1);
}

.page-about .about-flow > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .chapter-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(46px, 9vw, 100px);
  line-height: .82;
  letter-spacing: -.05em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--line-2);
  user-select: none;
}

.page-about .chapter-kicker {
  margin: 0 0 10px;
  color: var(--cyan);
}

.page-about .chapter-title {
  margin: 0;
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 900;
  color: var(--mist-050);
}

.page-about .chapter-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 2px;
  margin-top: 16px;
  background: var(--cyan);
}

.page-about .about-prose {
  max-width: 38em;
}

.page-about .about-prose--tight {
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.78;
  color: var(--ink-dim);
}

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

.page-about .about-quote {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 18px 20px;
  max-width: 36em;
  border-left: 4px solid var(--orange);
  background: rgba(14, 26, 48, .85);
  font-size: clamp(15px, 1.9vw, 19px);
  line-height: 1.65;
  color: var(--mist-050);
}

/* ---------- 四步流程 ---------- */
.page-about .pipeline {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line-2);
  border: 2px solid var(--line-2);
}

.page-about .pipeline__item {
  background: var(--abyss-800);
  padding: 20px 18px 22px;
  transition: background-color .18s var(--ease);
}

.page-about .pipeline__item:hover {
  background: var(--abyss-700);
}

.page-about .pipeline__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .pipeline__title {
  margin: 9px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--mist-050);
}

.page-about .pipeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-mute);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
  display: block;
}

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

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

.page-about .media__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .06em;
  color: var(--ink-mute);
}

/* ---------- 团队四宫格 ---------- */
.page-about .crew-grid {
  margin-top: clamp(22px, 3.5vw, 32px);
  display: grid;
  gap: 12px;
}

.page-about .crew {
  border: 2px solid var(--line-2);
  background: rgba(14, 26, 48, .72);
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .crew:hover,
.page-about .crew[open] {
  border-color: var(--cyan);
  box-shadow: var(--shadow-cyan);
}

.page-about .crew__sum {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 23px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .crew__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--mist-050);
}

.page-about .crew__hint {
  font-size: 11px;
  letter-spacing: .14em;
  padding: 3px 7px;
  border: 1px solid var(--line-2);
  color: var(--ink-mute);
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .crew[open] .crew__hint {
  color: var(--abyss-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .crew__list {
  margin: 0;
  padding: 12px 16px 18px;
  list-style: none;
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--line-1);
}

.page-about .crew__list li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-dim);
}

.page-about .crew__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 6px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 版本时间线 ---------- */
.page-about .verline {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .verline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--violet) 56%, var(--orange) 100%);
  opacity: .6;
}

.page-about .verline__item {
  position: relative;
  padding: 16px 18px 18px;
  border: 2px solid var(--line-2);
  background: rgba(14, 26, 48, .68);
  transition: border-color .18s var(--ease), transform .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .verline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 20px;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border: 2px solid var(--cyan);
  background: var(--abyss-900);
}

.page-about .verline__item:hover {
  border-color: var(--cyan);
  transform: translateX(4px);
  box-shadow: var(--shadow-cyan);
}

.page-about .verline__ver {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .verline__title {
  margin: 7px 0 8px;
  font-size: 17px;
  line-height: 1.4;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--mist-050);
}

.page-about .verline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-dim);
}

/* ---------- 对比表 ---------- */
.page-about .about-compare-wrap {
  margin-top: clamp(22px, 3.5vw, 34px);
  border: 2px solid var(--line-2);
  overflow-x: auto;
}

.page-about .about-compare {
  width: 100%;
  min-width: 440px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-compare caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink-mute);
  border-bottom: 1px solid var(--line-1);
}

.page-about .about-compare th,
.page-about .about-compare td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line-1);
}

.page-about .about-compare thead th {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
  border-bottom: 2px solid var(--line-2);
  white-space: nowrap;
}

.page-about .about-compare tbody th {
  font-weight: 600;
  color: var(--mist-050);
  white-space: nowrap;
}

.page-about .about-compare tbody td {
  color: var(--ink-dim);
  line-height: 1.6;
}

.page-about .about-compare tbody tr:hover th,
.page-about .about-compare tbody tr:hover td {
  background: var(--abyss-700);
}

.page-about .about-compare tbody tr:last-child th,
.page-about .about-compare tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 覆盖数据 ---------- */
.page-about .reach-grid {
  margin-top: clamp(22px, 3.5vw, 34px);
  display: grid;
  gap: 2px;
  background: var(--line-2);
  border: 2px solid var(--line-2);
}

.page-about .reach-cell {
  background: var(--abyss-800);
  padding: 22px 18px 24px;
  transition: background-color .18s var(--ease);
}

.page-about .reach-cell:hover {
  background: var(--abyss-700);
}

.page-about .reach-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.2vw, 38px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .reach-cell__label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-mute);
}

.page-about .reach-cell__text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-dim);
}

.page-about .reach-split {
  margin-top: clamp(24px, 4vw, 38px);
  display: grid;
  gap: 20px;
}

/* ---------- 合作清单 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line-2);
  border: 2px solid var(--line-2);
}

.page-about .partner-item {
  background: var(--abyss-800);
  padding: 18px 20px;
  display: grid;
  gap: 6px;
  transition: background-color .18s var(--ease);
}

.page-about .partner-item:hover {
  background: var(--abyss-700);
}

.page-about .partner-item__title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .partner-item__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-dim);
}

/* ---------- 收束 ---------- */
.page-about .about-next {
  margin-top: clamp(22px, 3.5vw, 32px);
  padding: clamp(22px, 4vw, 36px);
  border: 2px solid var(--line-2);
  background: var(--abyss-800);
  box-shadow: var(--shadow-cyan);
}

.page-about .about-next__lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .pipeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .chapter-head {
    grid-template-columns: clamp(84px, 13vw, 148px) minmax(0, 1fr);
    column-gap: clamp(16px, 3vw, 32px);
    align-items: end;
  }

  .page-about .partner-item {
    grid-template-columns: 150px minmax(0, 1fr);
    column-gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .reach-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
    gap: clamp(24px, 4vw, 44px);
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 118px minmax(0, 1fr);
    column-gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
    padding: 6px 0;
  }
}

@media (min-width: 1080px) {
  .page-about .pipeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .reach-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .verline__item:hover {
    transform: none;
  }

  .page-about .crew,
  .page-about .verline__item,
  .page-about .pipeline__item,
  .page-about .reach-cell,
  .page-about .partner-item,
  .page-about .rail-link {
    transition: none;
  }
}
<<<END>>>