.page-about {
  --about-rail: 200px;
  --about-gap: clamp(14px, 2.4vw, 24px);
  background: var(--abyss);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 22px) 0 clamp(40px, 6vw, 68px);
  background:
    radial-gradient(92% 72% at 88% -12%, rgba(25, 227, 208, .16), transparent 62%),
    radial-gradient(64% 52% at -6% 104%, rgba(255, 107, 61, .11), transparent 66%),
    linear-gradient(180deg, var(--abyss) 0%, var(--hull) 100%);
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8.2vw, 74px);
  line-height: 1.02;
  letter-spacing: -.022em;
  margin: 12px 0 20px;
  color: var(--paper);
}

.page-about .about-hero__title .hl {
  color: var(--electric);
}

.page-about .about-hero__lead {
  color: var(--mist);
  line-height: 1.92;
  max-width: 34em;
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px clamp(24px, 5vw, 44px);
  margin: 30px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__fact {
  min-width: 92px;
}

.page-about .about-hero__fact-k {
  margin: 0 0 5px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-hero__fact-v {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--electric);
}

.page-about .about-hero__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--r-lg);
  filter: saturate(.92) contrast(1.05);
}

/* ---------- 通用区块排版 ---------- */

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.8vw, 44px);
  line-height: 1.1;
  letter-spacing: -.022em;
  margin: 10px 0 14px;
  max-width: 18em;
  color: var(--paper);
}

.page-about .about-sub {
  color: var(--mist);
  line-height: 1.92;
  margin: 0 0 clamp(24px, 4vw, 40px);
  max-width: 34em;
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 四个小组 ---------- */

.page-about .crew-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .crew {
  --crew-tint: var(--electric);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 26px 20px 22px;
  border-radius: var(--r-md);
  border: 1px solid rgba(30, 58, 79, .95);
  background: linear-gradient(155deg, rgba(18, 58, 87, .74), rgba(11, 29, 46, .94));
  transition: transform .32s var(--ease), border-color .32s var(--ease);
}

.page-about .crew::after {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--crew-tint);
  transform-origin: left center;
  transition: transform .34s var(--ease);
}

.page-about .crew:hover,
.page-about .crew:focus-within {
  transform: translateY(-4px);
  border-color: rgba(25, 227, 208, .45);
}

.page-about .crew:hover::after,
.page-about .crew:focus-within::after {
  transform: scaleX(1.14);
}

.page-about .crew--check { --crew-tint: var(--electric-soft); }
.page-about .crew--product { --crew-tint: var(--coral); }
.page-about .crew--support { --crew-tint: var(--mist); }

.page-about .crew__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--crew-tint);
}

.page-about .crew__name {
  margin: 2px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .crew__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.page-about .crew__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .crew__tasks {
  list-style: none;
  margin: 14px 0 0;
  padding: 14px 0 0;
  border-top: 1px dashed rgba(30, 58, 79, .95);
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .crew__task {
  position: relative;
  padding-left: 15px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--paper);
}

.page-about .crew__task::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 7px;
  height: 1px;
  background: var(--crew-tint);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-time__banner {
  margin: 0 0 clamp(24px, 4vw, 40px);
}

.page-about .about-time__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--r-lg);
  filter: saturate(.9) contrast(1.05);
}

.page-about .about-time__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-about .about-rail::-webkit-scrollbar {
  display: none;
}

.page-about .rail-node {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: var(--r-pill);
  background: var(--tide);
  color: var(--paper);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: background .26s var(--ease), color .26s var(--ease);
}

.page-about .rail-node__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--electric);
  transition: color .26s var(--ease);
}

.page-about .rail-node:hover,
.page-about .rail-node:focus-visible {
  background: var(--electric);
  color: var(--abyss);
}

.page-about .rail-node:hover .rail-node__year,
.page-about .rail-node:focus-visible .rail-node__year {
  color: var(--abyss);
}

.page-about .about-time__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 30px 22px;
  border-left: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--electric);
  box-shadow: 0 0 0 4px rgba(25, 227, 208, .13);
}

.page-about .tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl-item__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--coral);
}

.page-about .tl-item__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3vw, 27px);
  line-height: 1.22;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-about .tl-item__text {
  margin: 0;
  max-width: 34em;
  color: var(--mist);
  line-height: 1.95;
}

/* ---------- 校对流程 ---------- */

.page-about .check-visual {
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: linear-gradient(140deg, rgba(18, 58, 87, .62), rgba(6, 18, 31, .92));
}

.page-about .funnel {
  display: block;
  width: 100%;
  max-width: 520px;
  height: auto;
  margin: 0 auto;
}

.page-about .check-visual__note {
  margin: 16px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--mist);
}

.page-about .check-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .check-step {
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(18, 58, 87, .42);
  overflow: hidden;
}

.page-about .check-step__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  transition: background .25s var(--ease);
}

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

.page-about .check-step__summary:hover {
  background: rgba(25, 227, 208, .08);
}

.page-about .check-step__summary:focus-visible {
  outline: 2px solid var(--electric-soft);
  outline-offset: -2px;
}

.page-about .check-step__no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--coral);
}

.page-about .check-step__name {
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -.01em;
  color: var(--paper);
  transition: color .25s var(--ease);
}

.page-about .check-step[open] .check-step__name {
  color: var(--electric);
}

.page-about .check-step__time {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .check-step__body {
  padding: 0 18px 18px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .check-step__body p {
  margin: 0;
}

.page-about .check-step__body ul {
  margin: 10px 0 0;
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ---------- 协作生态 ---------- */

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-eco__copy {
  min-width: 0;
}

.page-about .eco-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
}

.page-about .eco-item {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .eco-item__name {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .eco-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--electric);
}

.page-about .eco-item__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--mist);
  max-width: 34em;
}

.page-about .about-eco__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-eco__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--r-lg);
  filter: saturate(.92) contrast(1.05);
}

/* ---------- 办公与服务 ---------- */

.page-about .about-base {
  padding: clamp(38px, 6vw, 74px) 0;
  background: linear-gradient(180deg, var(--hull), var(--abyss));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-base__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-base__copy {
  min-width: 0;
}

.page-about .about-base__text {
  margin: 0 0 16px;
  max-width: 34em;
  color: var(--mist);
  line-height: 1.95;
}

.page-about .about-base__copy .btn {
  margin-top: 6px;
}

.page-about .base-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .base-stat {
  padding: 16px 14px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(18, 58, 87, .55);
}

.page-about .base-stat dt {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .base-stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--electric);
}

/* ---------- 认可 ---------- */

.page-about .honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .honor-item {
  display: flex;
  gap: 16px;
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(25, 227, 208, .09), rgba(6, 18, 31, .55));
}

.page-about .honor-item__year {
  flex: 0 0 auto;
  margin: 0;
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--coral);
}

.page-about .honor-item__main {
  min-width: 0;
}

.page-about .honor-item__name {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .honor-item__source {
  margin: 0 0 9px;
  font-size: 12px;
  line-height: 1.72;
  color: var(--electric-soft);
}

.page-about .honor-item__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.88;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding: clamp(36px, 6vw, 76px) 0 clamp(48px, 8vw, 96px);
}

.page-about .about-cta__inner {
  border-radius: var(--r-lg);
  border: 1px solid rgba(25, 227, 208, .26);
  padding: clamp(26px, 5vw, 52px);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(25, 227, 208, .22), transparent 62%),
    linear-gradient(150deg, rgba(18, 58, 87, .92), rgba(6, 18, 31, .96));
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.2vw, 38px);
  line-height: 1.16;
  letter-spacing: -.022em;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0 0 24px;
  max-width: 34em;
  color: var(--mist);
  line-height: 1.92;
}

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

/* ---------- 断点 ---------- */

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

  .page-about .base-stats {
    gap: 14px;
  }
}

@media (min-width: 860px) {
  .page-about .honor-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: clamp(30px, 4vw, 58px);
  }

  .page-about .about-time__body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 2px 0 2px 20px;
    border-left: 1px solid var(--line);
  }

  .page-about .rail-node {
    flex: 0 0 auto;
    width: 100%;
    display: block;
    padding: 10px 0;
    border-radius: 0;
    background: transparent;
    color: var(--mist);
    position: relative;
    white-space: normal;
  }

  .page-about .rail-node::before {
    content: "";
    position: absolute;
    left: -25px;
    top: 50%;
    width: 9px;
    height: 9px;
    margin-top: -4.5px;
    border-radius: 50%;
    background: var(--tide);
    transition: background .26s var(--ease), box-shadow .26s var(--ease), transform .26s var(--ease);
  }

  .page-about .rail-node__year {
    display: block;
    margin-bottom: 3px;
    font-size: 13px;
  }

  .page-about .rail-node:hover,
  .page-about .rail-node:focus-visible {
    background: transparent;
    color: var(--electric);
  }

  .page-about .rail-node:hover .rail-node__year,
  .page-about .rail-node:focus-visible .rail-node__year {
    color: var(--electric);
  }

  .page-about .rail-node:hover::before,
  .page-about .rail-node:focus-visible::before {
    background: var(--electric);
    box-shadow: 0 0 0 5px rgba(25, 227, 208, .16);
    transform: scale(1.15);
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-base__inner {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: center;
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .crew,
  .page-about .crew::after,
  .page-about .rail-node,
  .page-about .rail-node::before,
  .page-about .check-step__name {
    transition: none;
  }

  .page-about .crew:hover,
  .page-about .crew:focus-within {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>