.page-about {
  --about-edge: 20px;
  --about-line: rgba(159, 179, 200, .24);
  --about-line-soft: rgba(159, 179, 200, .13);
  --about-body: rgba(245, 241, 232, .84);
  background-color: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-sans);
  padding-bottom: 60px;
  overflow-x: hidden;
}

.page-about .wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--about-edge);
}

.page-about .wrap--wide {
  max-width: var(--shell-wide);
}

.page-about a:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 0 0 18px;
  font-size: 12px;
}

.page-about .breadcrumb__link {
  color: var(--mist);
  text-decoration: none;
  transition: color .16s var(--ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--orange-soft);
}

.page-about .breadcrumb__current {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 10px;
  background-image:
    radial-gradient(760px 340px at 92% -10%, rgba(62, 142, 126, .18), transparent 68%),
    radial-gradient(560px 300px at 2% 14%, rgba(255, 107, 53, .10), transparent 72%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-stamp {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--celadon);
}

.page-about .about-stamp::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--celadon);
  flex: none;
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 15em;
  font-weight: 900;
  font-size: clamp(31px, 6.4vw, 58px);
  line-height: 1.09;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__facts div {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-hero__facts dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

/* ---------- 图片容器 ---------- */
.page-about .media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  background: var(--ink-700);
}

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.75) contrast(1.03);
}

.page-about .media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 37, 69, .66) 0%, rgba(11, 37, 69, .22) 58%, rgba(11, 37, 69, .72) 100%);
}

.page-about .media__label {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  margin: 0;
  padding-left: 10px;
  border-left: 2px solid var(--orange);
  font-size: 11.5px;
  line-height: 1.45;
  color: var(--paper);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  padding: 46px 0;
}

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

.page-about .sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .sec-head .index-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1.3;
  color: var(--orange);
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(21px, 3.6vw, 28px);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -.01em;
  color: var(--paper);
}

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

.page-about .prose p {
  margin: 0 0 15px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-body);
}

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

.page-about .prose strong {
  color: var(--paper);
  font-weight: 800;
}

/* ---------- 01 起点 ---------- */
.page-about .origin {
  display: grid;
  gap: 26px;
}

.page-about .origin__aside {
  padding: 22px 20px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  background: linear-gradient(155deg, rgba(18, 58, 99, .92), rgba(11, 37, 69, .92));
}

.page-about .origin__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--celadon);
}

.page-about .origin__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .origin__item {
  padding-left: 13px;
  border-left: 2px solid var(--ink-500);
  transition: border-color .18s var(--ease);
}

.page-about .origin__item:hover {
  border-left-color: var(--orange);
}

.page-about .origin__item h3 {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .origin__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 02 区域网络 ---------- */
.page-about .network {
  display: grid;
  gap: 26px;
}

.page-about .principles {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .principles li {
  padding-left: 14px;
  border-left: 2px solid var(--ink-500);
  transition: border-color .18s var(--ease);
}

.page-about .principles li:hover {
  border-left-color: var(--orange);
}

.page-about .principles h3 {
  margin: 0 0 4px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .principles p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 03 团队 ---------- */
.page-about .team__stats {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 0 0 30px;
  padding: 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .team__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 20px 24px;
  background: var(--ink-800);
  border: 0;
  transition: background-color .2s var(--ease);
}

.page-about .team__stat:hover {
  background: var(--ink-700);
}

.page-about .stat__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .team__stat .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 7vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .team__stat .stat__unit {
  font-size: 13px;
  color: var(--mist);
}

.page-about .team__stat .stat__label {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team__stat-note {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .team__body {
  display: grid;
  gap: 26px;
}

.page-about .team__note {
  margin: 18px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--celadon);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(62, 142, 126, .12);
  font-size: 13px;
  line-height: 1.72;
  color: var(--paper);
}

/* ---------- 04 体系认证 ---------- */
.page-about .certs {
  display: grid;
  gap: 18px;
}

.page-about .cert {
  position: relative;
  padding: 24px 22px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  background: var(--ink-800);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease), background-color .2s var(--ease);
}

.page-about .cert:hover,
.page-about .cert:focus-visible,
.page-about .cert:focus-within {
  border-color: var(--orange);
  background: var(--ink-700);
  box-shadow: inset 0 0 0 1px rgba(255, 107, 53, .32), 0 0 22px rgba(255, 107, 53, .12);
}

.page-about .cert__top {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.page-about .cert__mark {
  flex: none;
  color: var(--celadon);
}

.page-about .cert__name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .cert__code {
  display: block;
  margin-top: 3px;
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .cert__cover {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 05 历程轨道 ---------- */
.page-about .track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .track__node {
  position: relative;
  padding: 0 0 26px 24px;
  border-left: 1px solid var(--ink-500);
}

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

.page-about .track__node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ink-500);
  transition: background-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .track__node:hover::before,
.page-about .track__node:focus-within::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, .18);
}

.page-about .track__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mist);
  transform-origin: left center;
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.page-about .track__node:hover .track__idx {
  color: var(--orange-soft);
  transform: scale(1.18);
}

.page-about .track__title {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .track__text {
  margin: 0;
  max-width: 26em;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .outcomes {
  list-style: none;
  display: grid;
  gap: 18px;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-line);
}

.page-about .outcomes li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .outcomes__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 26px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .outcomes__label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

/* ---------- 06 协作生态 ---------- */
.page-about .eco {
  display: grid;
  gap: 26px;
}

.page-about .eco__figure {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.page-about .eco__num {
  font-family: var(--font-mono);
  font-size: clamp(46px, 10vw, 76px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--orange);
}

.page-about .eco__unit {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .eco__note {
  margin: 14px 0 0;
  max-width: 22em;
  font-size: 13px;
  line-height: 1.72;
  color: var(--mist);
  padding-top: 14px;
  border-top: 1px solid var(--about-line-soft);
}

/* ---------- 尾声快捷区 ---------- */
.page-about .about-next {
  margin-top: 34px;
  padding: 42px 0 6px;
  border-top: 1px solid var(--about-line);
  background-image: linear-gradient(180deg, rgba(18, 58, 99, .5), rgba(11, 37, 69, 0));
}

.page-about .next-links {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 22px 0 0;
  padding: 0;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .next-links li {
  background: var(--ink-900);
}

.page-about .next__link {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 20px;
  padding: 16px 8px;
  text-decoration: none;
  color: var(--paper);
  transition: color .16s var(--ease), background-color .16s var(--ease);
}

.page-about .next__link:hover,
.page-about .next__link:focus-visible {
  color: var(--orange-soft);
  background: rgba(255, 107, 53, .07);
}

.page-about .next__label {
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .next__time {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .team__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .outcomes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

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

@media (min-width: 880px) {
  .page-about {
    --about-edge: 32px;
  }

  .page-about .about-hero {
    padding: 28px 0 12px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: 48px;
    padding-top: 32px;
  }

  .page-about .about-hero__lede {
    font-size: 16.5px;
  }

  .page-about .about-sec {
    padding: 60px 0;
  }

  .page-about .sec-head {
    margin-bottom: 30px;
  }

  .page-about .origin,
  .page-about .network,
  .page-about .team__body,
  .page-about .eco {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .origin {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 900px) {
  .page-about .track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    border-top: 1px solid var(--ink-500);
  }

  .page-about .track__node {
    padding: 26px 20px 0 0;
    border-left: 0;
  }

  .page-about .track__node:last-child {
    padding-right: 0;
  }

  .page-about .track__node::before {
    left: 0;
    top: -4px;
  }

  .page-about .track__text {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>