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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 60px;
  background:
    radial-gradient(880px 400px at 84% 4%, rgba(46, 242, 196, 0.16), transparent 68%),
    radial-gradient(720px 460px at 4% 98%, rgba(233, 169, 75, 0.13), transparent 70%),
    var(--ink);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -8%;
  top: 26%;
  width: 52%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-cyan) 34%, rgba(233, 169, 75, 0.5));
  transform: rotate(6deg);
  transform-origin: right center;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(243, 239, 227, 0.1) 1px, transparent 1px);
  background-size: 18px 18px;
  opacity: 0.45;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent 74%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent 74%);
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 2;
}

.page-about .about-hero .breadcrumb-item,
.page-about .about-hero .breadcrumb-item a {
  color: var(--slate);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb-item[aria-current="page"] {
  color: var(--cyan-soft);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 32px;
  margin-top: 30px;
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 700;
  font-stretch: condensed;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.12;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(243, 239, 227, 0.78);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-fact__key {
  font-size: 13px;
  line-height: 1.55;
  color: var(--slate);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  background: var(--paper);
  color: var(--carbon);
  padding: 40px 0 68px;
}

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

.page-about .about-side {
  display: none;
}

.page-about .about-toc {
  border-left: 1px solid var(--paper-dim);
  padding-left: 14px;
}

.page-about .about-toc__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-toc .toc-link {
  display: block;
  padding: 8px 0;
  font-size: 13.5px;
  line-height: 1.4;
  color: var(--slate);
  text-decoration: none;
  transition: color 160ms ease;
}

.page-about .about-toc .toc-link:hover {
  color: var(--ink);
}

.page-about .about-toc .toc-link[data-active] {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: 34px 0;
  border-top: 1px solid var(--paper-dim);
}

.page-about .about-content > .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px 16px;
  align-items: baseline;
  margin-bottom: 16px;
}

.page-about .about-sec__head .section-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--amber);
  -webkit-text-stroke: 1px var(--amber);
}

@supports (-webkit-text-stroke: 1px red) {
  .page-about .about-sec__head .section-num {
    color: transparent;
  }
}

.page-about .about-sec__head .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-stretch: condensed;
  letter-spacing: -0.015em;
  font-size: clamp(21px, 3.2vw, 29px);
  line-height: 1.28;
  color: var(--ink);
}

.page-about .about-sec p {
  margin: 0 0 1.05em;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--carbon);
}

.page-about .about-sec__intro {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

/* ---------- 图片框 ---------- */
.page-about .media-frame {
  position: relative;
  margin: 0 0 22px;
  overflow: hidden;
  border: 1px solid var(--paper-dim);
  background: var(--ink-lift);
  box-shadow: 3px 3px 0 rgba(222, 214, 196, 0.85);
}

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

.page-about .media-frame .media-frame__caption {
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--slate);
  background: rgba(255, 255, 255, 0.45);
  border-top: 1px solid var(--paper-dim);
}

/* ---------- 引文 ---------- */
.page-about .about-quote {
  margin: 24px 0 6px;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--cyan);
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.66;
  color: var(--ink);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 14px;
  width: 1px;
  background: var(--paper-dim);
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 21px;
  width: 9px;
  height: 9px;
  box-sizing: content-box;
  background: var(--amber);
  border: 2px solid var(--paper);
  border-radius: 50%;
}

.page-about .about-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 14px 0 12px;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}

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

.page-about .about-node__summary::marker {
  content: "";
}

.page-about .about-node__year {
  flex: 0 0 auto;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  white-space: nowrap;
  color: var(--ink);
  background: rgba(233, 169, 75, 0.22);
  border: 1px solid rgba(233, 169, 75, 0.55);
}

.page-about .about-node__title {
  flex: 1 1 220px;
  min-width: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-node__summary:hover .about-node__title {
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-underline-offset: 4px;
}

.page-about .about-node__arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--slate);
  transition: transform 160ms ease, color 160ms ease;
}

.page-about .about-node[open] .about-node__arrow {
  transform: rotate(90deg);
  color: var(--amber);
}

.page-about .about-node__body {
  padding: 0 0 16px;
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--carbon);
}

/* ---------- 团队 ---------- */
.page-about .about-team-layout {
  display: grid;
  gap: 22px;
}

.page-about .about-team {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  border-top: 1px solid var(--paper-dim);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 6px 12px;
  padding: 12px 0 14px;
  border-bottom: 1px solid var(--paper-dim);
}

.page-about .about-team__row--a {
  --w: 55.3%;
}

.page-about .about-team__row--b {
  --w: 23.7%;
}

.page-about .about-team__row--c {
  --w: 21%;
}

.page-about .about-team__role {
  font-size: 14.5px;
  color: var(--carbon);
}

.page-about .about-team__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-team__bar {
  position: relative;
  grid-column: 1 / -1;
  height: 6px;
  background: var(--paper-dim);
  overflow: hidden;
}

.page-about .about-team__bar::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--w, 40%);
  background: linear-gradient(90deg, var(--amber), rgba(46, 242, 196, 0.9));
}

/* ---------- 工序 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 20px 0 18px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 16px 16px 18px;
  background: var(--paper);
  border: 1px solid var(--paper-dim);
  box-shadow: 2px 2px 0 rgba(222, 214, 196, 0.95);
}

.page-about .about-flow__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-flow__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--carbon);
}

/* ---------- 合作标签墙 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-partners__item {
  padding: 10px 14px;
  background: var(--paper);
  border: 1px solid var(--paper-dim);
  box-shadow: 2px 2px 0 rgba(222, 214, 196, 0.95);
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.page-about .about-partners__item:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 2px 4px 0 rgba(46, 242, 196, 0.45);
}

.page-about .about-partners__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
}

.page-about .about-partners__type {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--slate);
  opacity: 0.6;
  transition: opacity 160ms ease, color 160ms ease;
}

.page-about .about-partners__item:hover .about-partners__type {
  opacity: 1;
  color: var(--ink);
}

/* ---------- 覆盖 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 20px;
  margin-top: 6px;
}

.page-about .about-coverage__figure {
  display: inline-block;
  padding-bottom: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(48px, 9vw, 74px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
  border-bottom: 3px solid var(--amber);
}

.page-about .about-coverage__figure span {
  display: block;
  margin-top: 10px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-audience {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-audience li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--carbon);
}

.page-about .about-audience li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--amber);
  transform: rotate(45deg);
}

/* ---------- 段落收尾动作 ---------- */
.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px dashed var(--paper-dim);
}

.page-about .about-next .btn {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: 3px 3px 0 var(--amber);
  transition: background 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

.page-about .about-next .btn:hover {
  background: var(--amber);
  color: var(--ink);
  box-shadow: 3px 3px 0 var(--ink);
}

.page-about .about-link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--amber);
  transition: border-color 160ms ease;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-partners__item:nth-child(3n + 2) {
    margin-top: 14px;
  }

  .page-about .about-partners__item:nth-child(4n) {
    margin-left: 16px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 780px) {
  .page-about .about-hero {
    padding: 28px 0 72px;
  }

  .page-about .about-body {
    padding: 52px 0 84px;
  }

  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-team-layout .media-frame {
    margin-bottom: 0;
  }

  .page-about .about-coverage {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-sec {
    padding: 42px 0;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 318px);
    gap: 60px;
    align-items: end;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-side {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-partners__item,
  .page-about .about-node__arrow,
  .page-about .about-link,
  .page-about .about-next .btn {
    transition: none;
  }
}
<<<END>>>