.page-about {
  --about-diagonal: 4deg;
  --about-cut: 18px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ============ 通用标题 ============ */
.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -.01em;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  color: var(--ink);
}

.page-about .eyebrow {
  font-size: .74rem;
  letter-spacing: .16em;
  margin: 0 0 14px;
}

.page-about .prose p {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.82;
  margin: 0 0 1em;
}

/* ============ 面包屑 ============ */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45em;
  font-size: .74rem;
  letter-spacing: .07em;
  color: var(--ink-55);
  margin-bottom: clamp(20px, 4vw, 34px);
}

.page-about .breadcrumbs a {
  color: var(--ink-70);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}

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

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(26px, 5vw, 52px) 0 clamp(40px, 6vw, 78px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image: repeating-linear-gradient(90deg, rgba(20, 22, 28, .05) 0 1px, transparent 1px 76px);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: clamp(90px, 20vw, 260px);
  height: 100%;
  z-index: -1;
  background: linear-gradient(150deg, transparent 42%, rgba(30, 110, 128, .14) 42.4%);
  pointer-events: none;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 7vw, 4.5rem);
  line-height: 1.06;
  letter-spacing: -.018em;
  color: var(--ink);
  margin: 0 0 clamp(26px, 4vw, 44px);
  max-width: 24ch;
}

.page-about .about-hero__ver {
  font-family: var(--font-mono);
  font-size: .74em;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: -.02em;
}

.page-about .about-hero__foot {
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
  border-top: 1px solid var(--line-light);
  padding-top: clamp(18px, 2.8vw, 28px);
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: clamp(1rem, 2vw, 1.12rem);
  line-height: 1.85;
  color: var(--ink-82);
  margin: 0;
  max-width: 42ch;
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--ink-55);
}

.page-about .about-hero__meta li {
  position: relative;
  padding-left: 14px;
}

.page-about .about-hero__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  transform: translateY(-50%) rotate(45deg);
  background: var(--gold);
}

/* ============ 品牌定位 ============ */
.page-about .about-position {
  position: relative;
  background: linear-gradient(155deg, var(--indigo) 0%, #241a4a 58%, var(--deep-sea) 100%);
  color: var(--paper);
  padding: clamp(46px, 7vw, 94px) 0 clamp(52px, 7vw, 96px);
}

.page-about .about-position::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(46%, 520px);
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--neon));
}

.page-about .about-position__inner {
  display: grid;
  gap: clamp(30px, 5vw, 60px);
}

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

.page-about .about-position .eyebrow {
  color: var(--gold-light);
}

.page-about .about-position .prose p {
  color: var(--paper-80);
  max-width: 38ch;
}

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

.page-about .about-path__step {
  position: relative;
  padding: 22px 20px 30px;
  background: rgba(245, 241, 232, .06);
  box-shadow: inset 0 1px 0 rgba(235, 208, 126, .28);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: background .22s ease;
}

.page-about .about-path__step:hover {
  background: rgba(245, 241, 232, .11);
}

.page-about .about-path__num {
  display: block;
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--gold-light);
  margin-bottom: 12px;
}

.page-about .about-path__step h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 0 9px;
  color: var(--paper);
}

.page-about .about-path__step p {
  font-family: var(--font-body);
  font-size: .95rem;
  line-height: 1.72;
  color: var(--paper-70);
  margin: 0;
}

/* ============ 发展节点 ============ */
.page-about .about-era {
  padding: clamp(50px, 8vw, 108px) 0;
  background: var(--paper);
}

.page-about .about-era__intro {
  max-width: 46ch;
  margin-bottom: clamp(24px, 3.4vw, 34px);
}

.page-about .about-era__intro p {
  color: var(--ink-70);
}

.page-about .about-era__figure {
  margin: 0 0 clamp(30px, 4vw, 46px);
}

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

.page-about .about-era__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .about-era__nav a {
  display: inline-block;
  padding: 7px 16px 8px;
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--ink-70);
  text-decoration: none;
  background: rgba(20, 22, 28, .06);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: background .2s ease, color .2s ease;
}

.page-about .about-era__nav a:hover,
.page-about .about-era__nav a:focus-visible {
  background: var(--gold);
  color: var(--deep-sea);
}

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

.page-about .about-era__list::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), var(--teal-mid));
}

.page-about .about-era__item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 40px) 34px;
}

.page-about .about-era__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  box-sizing: border-box;
  background: var(--paper);
  border: 2px solid var(--gold);
}

.page-about .about-era__stamp {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--teal-mid);
  margin: 0 0 8px;
}

.page-about .about-era__body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.04rem, 2.2vw, 1.26rem);
  margin: 0 0 9px;
  color: var(--ink);
}

.page-about .about-era__body p {
  font-family: var(--font-body);
  font-size: .99rem;
  line-height: 1.82;
  color: var(--ink-70);
  margin: 0;
  max-width: 44ch;
}

/* ============ 团队构成 ============ */
.page-about .about-team {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--navy), var(--deep-sea));
  color: var(--paper);
  padding: clamp(50px, 7vw, 96px) 0;
}

.page-about .about-team::before {
  content: "";
  position: absolute;
  top: -20%;
  right: -12%;
  width: 62%;
  height: 150%;
  background: repeating-linear-gradient(112deg, rgba(200, 162, 39, .085) 0 1px, transparent 1px 46px);
  pointer-events: none;
}

.page-about .about-team__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 4vw, 50px);
}

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

.page-about .about-team .eyebrow {
  color: var(--gold-light);
}

.page-about .about-counts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
  margin: clamp(20px, 3vw, 30px) 0;
}

.page-about .about-counts__cell {
  position: relative;
  background: var(--navy);
  padding: 20px 16px 18px;
}

.page-about .about-counts__cell::after {
  content: "";
  position: absolute;
  right: 0;
  top: 18%;
  height: 64%;
  width: 1px;
  transform: rotate(var(--about-diagonal));
  background: var(--line-dark);
}

.page-about .about-counts__cell:last-child::after,
.page-about .about-counts__cell:nth-child(2n)::after {
  display: none;
}

.page-about .about-counts__num {
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--gold-light);
  margin: 0 0 8px;
}

.page-about .about-counts__num span {
  font-family: var(--font-body);
  font-size: .36em;
  font-weight: 400;
  color: var(--paper-55);
}

.page-about .about-counts__label {
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 5px;
}

.page-about .about-counts__desc {
  font-size: .68rem;
  letter-spacing: .05em;
  line-height: 1.5;
  color: var(--paper-55);
  margin: 0;
}

.page-about .about-team__text p {
  color: var(--paper-80);
  max-width: 46ch;
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: 4px;
  overflow: hidden;
}

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

/* ============ 服务网络 ============ */
.page-about .about-reach {
  background: var(--paper);
  padding: clamp(50px, 7vw, 100px) 0;
}

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
  margin-bottom: clamp(26px, 3.4vw, 38px);
}

.page-about .about-reach__stats {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-reach__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-reach__stat:first-child {
  border-top: 1px solid var(--line-light);
}

.page-about .about-reach__stat dt {
  font-family: var(--font-body);
  font-size: .94rem;
  color: var(--ink-70);
}

.page-about .about-reach__stat dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.15rem);
  letter-spacing: -.025em;
  color: var(--navy);
  white-space: nowrap;
}

.page-about .about-reach__stat dd span {
  font-family: var(--font-body);
  font-size: .38em;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--ink-55);
  margin-left: 3px;
}

.page-about .about-reach__chart {
  margin: 0;
  background: var(--deep-sea);
  padding: clamp(20px, 3vw, 30px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-reach__chart figcaption {
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--paper-70);
  margin-bottom: 12px;
}

.page-about .about-reach__chart-scroll {
  overflow-x: auto;
}

.page-about .about-reach__chart svg {
  display: block;
  width: 100%;
  min-width: 440px;
  height: auto;
}

.page-about .about-reach__chart svg text {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .05em;
  fill: var(--paper-70);
}

.page-about .about-reach__note {
  max-width: 56ch;
}

.page-about .about-reach__note p {
  color: var(--ink-70);
}

/* ============ 资料库建设 ============ */
.page-about .about-library {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--teal-deep);
  color: var(--paper);
  padding: clamp(50px, 7vw, 100px) 0;
}

.page-about .about-library__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: -2;
}

.page-about .about-library__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .24;
}

.page-about .about-library::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(120deg, rgba(16, 57, 74, .94), rgba(6, 26, 46, .82));
}

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

.page-about .about-library .eyebrow {
  color: var(--neon);
}

.page-about .about-library__lead {
  max-width: 48ch;
  margin-bottom: clamp(22px, 3vw, 30px);
}

.page-about .about-library__lead p {
  color: var(--paper-80);
}

.page-about .about-library__stats {
  list-style: none;
  margin: 0 0 clamp(24px, 3.4vw, 34px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .about-library__stat {
  border-left: 2px solid var(--neon);
  padding: 2px 0 2px 14px;
}

.page-about .about-library__stat strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  letter-spacing: -.025em;
  line-height: 1.1;
  color: var(--paper);
}

.page-about .about-library__stat span {
  font-family: var(--font-body);
  font-size: .82rem;
  color: var(--paper-70);
}

.page-about .about-library__details {
  border-top: 1px solid var(--line-dark);
}

.page-about .about-library__details:last-of-type {
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-library__details summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
  transition: color .2s ease;
}

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

.page-about .about-library__details summary:hover {
  color: var(--neon);
}

.page-about .about-library__details summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  line-height: 1;
  color: var(--neon);
}

.page-about .about-library__details[open] summary::after {
  content: "−";
}

.page-about .about-library__detail {
  padding: 0 0 22px;
}

.page-about .about-library__detail ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  max-width: 62ch;
}

.page-about .about-library__detail li {
  position: relative;
  padding-left: 18px;
  font-family: var(--font-body);
  font-size: .96rem;
  line-height: 1.78;
  color: var(--paper-70);
}

.page-about .about-library__detail li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 1px;
  background: var(--gold-light);
}

/* ============ 合作生态 ============ */
.page-about .about-partner {
  background: var(--paper);
  padding: clamp(50px, 7vw, 100px) 0;
}

.page-about .about-partner__lead {
  max-width: 50ch;
  margin-bottom: clamp(24px, 3.4vw, 36px);
}

.page-about .about-partner__lead p {
  color: var(--ink-70);
}

.page-about .about-partner__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-partner__card {
  position: relative;
  background: rgba(255, 255, 255, .62);
  padding: 28px 22px 34px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  box-shadow: inset 0 1px 0 rgba(20, 22, 28, .08);
}

.page-about .about-partner__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  height: 3px;
  background: var(--gold);
}

.page-about .about-partner__card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 0 10px;
  color: var(--navy);
}

.page-about .about-partner__card p {
  font-family: var(--font-body);
  font-size: .95rem;
  line-height: 1.78;
  color: var(--ink-70);
  margin: 0;
}

/* ============ 服务承诺 ============ */
.page-about .about-commit {
  background: linear-gradient(140deg, var(--indigo), var(--deep-sea));
  color: var(--paper);
  padding: clamp(50px, 7vw, 100px) 0;
}

.page-about .about-commit__inner {
  display: grid;
  gap: clamp(28px, 4vw, 50px);
}

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

.page-about .about-commit .eyebrow {
  color: var(--gold-light);
}

.page-about .about-commit__text p {
  color: var(--paper-80);
  max-width: 44ch;
}

.page-about .about-commit__links {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 30px);
  padding: 0;
}

.page-about .about-commit__links li {
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-commit__links li:first-child {
  border-top: 1px solid var(--line-dark);
}

.page-about .about-commit__links a {
  display: block;
  padding: 14px 0;
  font-family: var(--font-body);
  font-size: .98rem;
  line-height: 1.6;
  color: var(--paper-80);
  text-decoration: none;
  transition: color .2s ease, padding-left .2s ease;
}

.page-about .about-commit__links a::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 1px;
  margin-right: 10px;
  vertical-align: middle;
  background: var(--gold);
}

.page-about .about-commit__links a:hover {
  color: var(--gold-light);
  padding-left: 6px;
}

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

/* ============ 响应式 ============ */
@media (min-width: 620px) {
  .page-about .about-path {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-counts__cell::after {
    display: block;
  }

  .page-about .about-counts__cell:last-child::after {
    display: none;
  }

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

@media (min-width: 860px) {
  .page-about .about-hero__foot {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-reach__stats {
    align-content: start;
  }

  .page-about .about-era__list::before {
    left: 124px;
  }

  .page-about .about-era__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 56px;
    padding-left: 0;
  }

  .page-about .about-era__item::before {
    left: 116px;
    top: 9px;
  }

  .page-about .about-era__stamp {
    text-align: right;
    padding-top: 4px;
    margin-bottom: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-position__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

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

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

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

@media (min-width: 1040px) {
  .page-about .about-path {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-path__step {
    padding: 22px 16px 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-path__step,
  .page-about .about-era__nav a,
  .page-about .about-commit__links a,
  .page-about .breadcrumbs a {
    transition: none;
  }
}
<<<END>>>