.page-about {
  --about-index-w: 178px;
  --about-block: clamp(2.25rem, 5vw, 4rem);
  position: relative;
  isolation: isolate;
  overflow-x: clip;
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(52rem 34rem at 108% -6%, rgba(255, 138, 61, 0.13), transparent 62%),
    radial-gradient(46rem 30rem at -8% 24%, rgba(45, 125, 255, 0.12), transparent 60%);
}

.page-about::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(138, 155, 184, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(138, 155, 184, 0.05) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: linear-gradient(to bottom, #000, transparent 68%);
  mask-image: linear-gradient(to bottom, #000, transparent 68%);
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  box-sizing: border-box;
}

.page-about .breadcrumb {
  margin: clamp(1rem, 2.5vw, 1.6rem) 0 0;
}

/* ---------- 布局 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.25rem);
  margin-top: clamp(1.1rem, 2.6vw, 1.75rem);
}

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

/* ---------- 品牌索引 ---------- */

.page-about .about-index {
  min-width: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-block: 0.7rem;
}

.page-about .about-index__label {
  margin: 0 0 0.55rem;
  font-family: var(--font-serif);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--gold);
}

.page-about .about-index__list {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0 0 0.1rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  color: var(--paper);
  text-decoration: none;
  font-size: 0.8rem;
  line-height: 1.4;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--amber);
  color: var(--amber);
  outline: none;
}

.page-about .about-index__num {
  font-size: 0.68rem;
  color: var(--blue);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding-bottom: clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  color: var(--amber);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(2rem, 6.2vw, 4.2rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__accent {
  color: var(--amber);
}

.page-about .about-hero__lede {
  margin: clamp(1rem, 2.5vw, 1.5rem) 0 0;
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__stats > li {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero__stats .num {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
  flex: none;
}

/* ---------- 章节通用 ---------- */

.page-about .about-section {
  padding-block: var(--about-block);
  border-bottom: 1px solid var(--line);
  scroll-margin-top: calc(var(--topbar) + 1rem);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
}

.page-about .about-section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 0.9rem;
  align-items: start;
  margin-bottom: clamp(1.1rem, 2.5vw, 1.75rem);
}

.page-about .about-section__idx {
  margin: 0;
  padding-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--blue);
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(1.45rem, 3.6vw, 2.3rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 品牌主张 ---------- */

.page-about .about-stance__lead {
  margin: 0 0 clamp(1.2rem, 3vw, 1.9rem);
  padding-left: 0.95rem;
  border-left: 2px solid var(--amber);
  font-size: clamp(1.05rem, 2.1vw, 1.35rem);
  font-weight: 500;
  line-height: 1.65;
  color: var(--paper);
  max-width: 46ch;
}

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

.page-about .tenet {
  background: var(--ink-2);
  padding: 1.15rem 1.05rem 1.3rem;
  min-width: 0;
}

.page-about .tenet__title {
  margin: 0 0 0.5rem;
  font-size: 0.96rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .tenet__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-note {
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-note p {
  margin: 0;
  max-width: 50ch;
  font-family: var(--font-serif);
  font-size: 0.86rem;
  line-height: 1.9;
  color: var(--muted);
}

.page-about .about-note--wide p {
  max-width: 56ch;
}

/* ---------- 发展历程 ---------- */

.page-about .about-timeline-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.15rem;
  border-left: 1px solid var(--line-strong);
  min-width: 0;
}

.page-about .tl-node {
  position: relative;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: calc(-1.15rem - 4px);
  top: 1.5rem;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--amber);
  transform: rotate(45deg);
}

.page-about .tl-node__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 14px;
  align-items: center;
  gap: 0.8rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-node__summary:focus-visible {
  outline: 1px solid var(--amber);
  outline-offset: 3px;
}

.page-about .tl-node__year {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .tl-node__title {
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-node__summary:hover .tl-node__title {
  color: var(--amber);
}

.page-about .tl-node__mark {
  position: relative;
  width: 14px;
  height: 14px;
}

.page-about .tl-node__mark::before,
.page-about .tl-node__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--amber);
  transition: transform var(--dur) var(--ease);
}

.page-about .tl-node__mark::after {
  transform: rotate(90deg);
}

.page-about .tl-node__detail[open] .tl-node__mark::after {
  transform: rotate(0deg);
}

.page-about .tl-node__body {
  padding: 0.2rem 0 1.1rem;
}

.page-about .tl-node__body p {
  margin: 0;
  max-width: 48ch;
  font-size: 0.9rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-shot {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
  min-width: 0;
}

.page-about .about-shot img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 1.8rem);
}

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

.page-about .role {
  background: var(--ink-2);
  padding: 1.1rem 1rem 1.25rem;
  min-width: 0;
}

.page-about .role__tag {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--blue);
}

.page-about .role__name {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  font-weight: 800;
  color: var(--paper);
}

.page-about .role__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-team__figure .media-frame__caption {
  display: block;
  padding: 0.65rem 0.85rem;
  font-family: var(--font-serif);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 1.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
}

.page-about .about-flow > li {
  position: relative;
  padding: 0.85rem 0 0.85rem 1.55rem;
  border-top: 1px solid var(--line-strong);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-flow > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.12rem;
  width: 8px;
  height: 8px;
  background: var(--amber);
}

.page-about .about-flow > li span {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.85rem;
  font-weight: 400;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partners > li {
  background: var(--ink-2);
  padding: 1.1rem 0.95rem 1.2rem;
  min-width: 0;
}

.page-about .about-partners__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.65rem, 4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .about-partners__label {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-partners__text {
  margin: clamp(1.1rem, 2.5vw, 1.5rem) 0 0;
  max-width: 58ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 新疆服务 ---------- */

.page-about .about-region {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 1.9rem);
}

.page-about .about-region__lead {
  margin: 0 0 0.85rem;
  font-size: clamp(1rem, 1.9vw, 1.16rem);
  font-weight: 600;
  line-height: 1.72;
  color: var(--paper);
}

.page-about .about-region__text {
  margin: 0;
  max-width: 48ch;
  font-size: 0.92rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-region__cta {
  margin-top: 1.25rem;
}

.page-about .about-ridge {
  margin: clamp(1.25rem, 3vw, 2rem) 0;
  opacity: 0.7;
}

.page-about .about-ridge svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 界面与表达 ---------- */

.page-about .about-visual__text {
  margin: 1rem 0 0;
  max-width: 56ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-swatches {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  margin: clamp(1.1rem, 2.5vw, 1.5rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-swatch {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--muted);
  min-width: 0;
}

.page-about .about-swatch__chip {
  width: 22px;
  height: 22px;
  flex: none;
  border: 1px solid var(--line-strong);
}

.page-about .about-swatch__chip--ink {
  background: var(--ink-2);
}

.page-about .about-swatch__chip--blue {
  background: var(--blue);
}

.page-about .about-swatch__chip--amber {
  background: var(--amber);
}

.page-about .about-swatch__chip--gold {
  background: var(--gold);
}

/* ---------- 下一页入口 ---------- */

.page-about .about-next {
  padding-block: clamp(2.25rem, 5vw, 3.5rem);
  border-top: 1px solid var(--line-strong);
  margin-top: clamp(1rem, 2vw, 1.5rem);
}

.page-about .about-next__title {
  margin: 0;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  font-weight: 900;
  line-height: 1.22;
  color: var(--paper);
}

.page-about .about-next__text {
  margin: 0.9rem 0 0;
  max-width: 54ch;
  font-size: 0.94rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.35rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 1.5rem;
  }

  .page-about .about-hero__stats > li {
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.9rem 0 0;
    border-bottom: 0;
  }

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

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

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.9rem;
  }

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

@media (min-width: 900px) {
  .page-about .about-timeline-wrap {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-timeline__media {
    position: sticky;
    top: 96px;
  }

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

  .page-about .about-region {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: center;
  }

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

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

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    column-gap: clamp(2.25rem, 4vw, 3.75rem);
    align-items: start;
  }

  .page-about .about-index {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: 96px;
    border: 0;
    border-left: 1px solid var(--line-strong);
    padding: 0.25rem 0 0.25rem 1.15rem;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 0.1rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border: 0;
    padding: 0.32rem 0;
    font-size: 0.84rem;
  }

  .page-about .about-main {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-section {
    scroll-margin-top: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .tl-node__title,
  .page-about .tl-node__mark::before,
  .page-about .tl-node__mark::after {
    transition: none;
  }
}
<<<END>>>