.page-about {
  --about-rail: 236px;
  --about-gap: clamp(24px, 4vw, 56px);
  --about-radius: var(--r-md);
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-body);
}

.page-about a {
  color: var(--pine);
  text-decoration: none;
}

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

.page-about a:focus-visible,
.page-about button:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb-bar {
  padding: 14px 0 0;
}

.page-about .crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--ash);
}

.page-about .crumb a {
  color: var(--pine);
}

.page-about .crumb__sep {
  color: var(--ash);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(24px, 4vw, 48px) 0 clamp(28px, 4vw, 48px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--pine);
}

.page-about h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--ink);
  max-width: 15em;
}

.page-about .lede {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text);
  max-width: 38em;
}

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

.page-about .about-hero__figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-figure {
  background: var(--paper-2);
  padding: 18px 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -.02em;
}

.page-about .about-figure__plus {
  color: var(--amber);
  font-size: .7em;
  vertical-align: super;
}

.page-about .about-figure__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--pine);
}

/* ---------- 首屏主视觉 ---------- */
.page-about .about-visual {
  margin: clamp(30px, 5vw, 52px) 0 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--ink);
  box-shadow: var(--shadow-soft);
}

.page-about .about-visual__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: .92;
}

.page-about .about-visual__cap {
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--cyan-soft);
  background: var(--ink);
  border-top: 1px solid var(--line-dark);
}

/* ---------- 主体分栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 52px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* ---------- 左侧索引 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 18px 0 20px;
}

.page-about .about-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ash);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 16px;
}

.page-about .about-index__list a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 0;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px dotted var(--line);
  transition: color .18s var(--ease);
}

.page-about .about-index__list a:hover {
  color: var(--pine);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--amber);
  letter-spacing: .04em;
}

.page-about .about-index__meta {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  color: var(--ash);
}

/* ---------- 区块通用 ---------- */
.page-about .about-block {
  padding: clamp(26px, 3.6vw, 44px) 0 clamp(30px, 4vw, 52px);
  border-top: 1px solid var(--line);
}

.page-about .about-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-block--tint {
  background: var(--paper-2);
  border-radius: var(--about-radius);
  padding-inline: clamp(18px, 3vw, 34px);
  border-top: 0;
  margin-top: 8px;
}

.page-about .about-block--ink {
  background: var(--ink);
  color: var(--cyan-soft);
  border-radius: var(--about-radius);
  padding-inline: clamp(18px, 3vw, 34px);
  border-top: 0;
  margin-top: 8px;
}

.page-about .about-block__head {
  margin-bottom: clamp(22px, 3vw, 32px);
  max-width: 44em;
}

.page-about .about-block__num {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .about-block__head h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-block__lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-block__head--dark h2 {
  color: var(--paper);
}

.page-about .about-block__head--dark .about-block__lead {
  color: var(--cyan-soft);
  opacity: .85;
}

.page-about .about-block__note {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--pine);
}

.page-about .about-block__note--dark {
  border-top-color: var(--line-dark);
  color: var(--cyan-soft);
  opacity: .8;
}

/* ---------- 时间线 ---------- */
.page-about .about-history {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 30px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--pine);
  box-sizing: border-box;
}

.page-about .about-timeline__item:first-child::before {
  background: var(--cyan);
  border-color: var(--ink);
}

.page-about .about-node {
  border-bottom: 1px solid var(--line);
  padding: 4px 0 8px;
}

.page-about .about-node__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--amber);
  min-width: 52px;
}

.page-about .about-node__title {
  flex: 1;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.4;
}

.page-about .about-node__hint {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
  align-self: center;
}

.page-about .about-node__hint::before,
.page-about .about-node__hint::after {
  content: "";
  position: absolute;
  background: var(--pine);
  transition: transform .2s var(--ease);
}

.page-about .about-node__hint::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1.5px;
}

.page-about .about-node__hint::after {
  top: 0;
  left: 6px;
  width: 1.5px;
  height: 14px;
}

.page-about .about-node[open] .about-node__hint::after {
  transform: scaleY(0);
}

.page-about .about-node__body {
  padding: 0 0 14px;
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-history__fig {
  margin: 0;
  align-self: start;
}

.page-about .about-history__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--about-radius);
  background: var(--ink-2);
}

.page-about .about-history__fig figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--ash);
}

/* ---------- 流程带 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  counter-reset: none;
}

.page-about .about-flow__step {
  background: var(--paper);
  padding: 18px 16px 20px;
  border-left: 2px solid transparent;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-flow__step:hover {
  border-left-color: var(--cyan);
  background: var(--paper);
}

.page-about .about-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--amber);
  margin-bottom: 8px;
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--pine);
}

/* ---------- 资料库 ---------- */
.page-about .about-library {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-library__copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .about-library__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-library__list li {
  background: var(--paper-2);
  padding: 13px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
}

.page-about .about-library__k {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--ink);
  min-width: 84px;
}

.page-about .about-library__v {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--pine);
  flex: 1;
  min-width: 140px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-quad {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-quad__cell {
  background: var(--ink-2);
  padding: 18px 16px 20px;
  transition: background .2s var(--ease);
}

.page-about .about-quad__cell:hover {
  background: var(--pine);
}

.page-about .about-quad__cell h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .01em;
}

.page-about .about-quad__cell p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--cyan-soft);
  opacity: .86;
}

.page-about .about-team__fig {
  margin: 0;
}

.page-about .about-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--about-radius);
  opacity: .9;
}

.page-about .about-team__fig figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--cyan-soft);
  opacity: .7;
}

/* ---------- 认证 ---------- */
.page-about .about-cert {
  background: var(--ink);
  color: var(--cyan-soft);
  border-radius: var(--about-radius);
  padding: clamp(18px, 2.6vw, 26px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-cert__main {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 14px;
}

.page-about .about-cert__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(57, 242, 208, .18);
  flex: none;
  margin-top: 7px;
}

.page-about .about-cert__main > div {
  flex: 1;
  min-width: 200px;
}

.page-about .about-cert__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-cert__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cyan-soft);
  opacity: .85;
}

.page-about .about-cert__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line-dark);
}

.page-about .about-cert__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ash);
}

.page-about .about-cert__code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
  letter-spacing: .03em;
}

.page-about .about-cert .copy-btn {
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-dark);
  background: transparent;
  color: var(--cyan);
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease);
}

.page-about .about-cert .copy-btn:hover {
  background: var(--cyan);
  color: var(--ink);
}

.page-about .about-reach {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  overflow: hidden;
  margin-top: 22px;
}

.page-about .about-reach__item {
  background: var(--paper-2);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-reach__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-reach__unit {
  font-size: .55em;
  margin-left: 2px;
  color: var(--pine);
}

.page-about .about-reach__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--pine);
}

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

.page-about .about-scene {
  background: transparent;
  padding: 18px 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scene:last-child {
  border-bottom: 0;
}

.page-about .about-scene__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--pine);
  align-self: start;
  padding-top: 3px;
}

.page-about .about-scene__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-scene__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  margin-top: clamp(32px, 4vw, 48px);
  border-top: 1px solid var(--line);
  padding-top: clamp(26px, 3.4vw, 40px);
}

.page-about .about-next__inner {
  max-width: 40em;
}

.page-about .about-next h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 25px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
}

.page-about .about-next p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text);
}

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

/* ---------- 按钮微调 ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 22px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  transition: transform .18s var(--ease), background .18s var(--ease), color .18s var(--ease);
}

.page-about .btn:hover {
  transform: translateY(-1px);
}

.page-about .btn--mini {
  padding: 7px 16px;
  font-size: 12.5px;
}

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

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

.page-about .btn--solid {
  background: var(--pine);
  color: var(--paper);
}

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

.page-about .btn--ghost {
  border-color: var(--line);
  color: var(--ink);
  background: transparent;
}

.page-about .btn--ghost:hover {
  border-color: var(--pine);
  color: var(--pine);
}

.page-about .btn--ghost-dark {
  border-color: var(--line-dark);
  color: var(--cyan);
  background: transparent;
  white-space: nowrap;
}

.page-about .btn--ghost-dark:hover {
  background: var(--cyan);
  color: var(--ink);
}

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

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

  .page-about .about-scene {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 20px;
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

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

  .page-about .about-history {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-library {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: start;
  }

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

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

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    border-top: 1px solid var(--line);
    padding-top: 16px;
  }

  .page-about .about-index__list {
    grid-template-columns: 1fr;
  }

  .page-about .about-block--tint,
  .page-about .about-block--ink {
    padding-inline: clamp(24px, 3vw, 42px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }

  .page-about .btn:hover {
    transform: none;
  }
}
<<<END>>>