.page-about {
  --about-rail: 118px;
  --about-pad: clamp(48px, 7vw, 92px);
  --about-gap: clamp(24px, 4vw, 56px);
  --about-line: rgba(169, 184, 204, 0.24);
  --about-line-soft: rgba(169, 184, 204, 0.12);
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(169, 184, 204, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169, 184, 204, 0.05) 1px, transparent 1px);
  background-size: 48px 48px, 48px 48px;
  overflow-x: hidden;
}

.page-about .about-hero {
  padding: clamp(22px, 3.6vw, 38px) 0 clamp(38px, 6vw, 68px);
  border-bottom: 4px solid var(--coral);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--coral);
  border-bottom-color: var(--coral);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-label);
  font-size: var(--step-label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--jade);
}

.page-about .about-kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--jade);
}

.page-about .about-h1 {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  max-width: 19ch;
  text-wrap: balance;
}

.page-about .about-lede {
  margin: 0;
  max-width: 48ch;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(28px, 4.6vw, 44px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__stats li {
  background: var(--ink);
  padding: 14px 16px 16px;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 32px);
  line-height: 1;
  color: var(--sand);
}

.page-about .about-hero__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-section {
  padding: var(--about-pad) 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-section__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .about-section__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5.4vw, 52px);
  line-height: 1;
  color: var(--sand);
  opacity: 0.9;
}

.page-about .about-rail-label {
  font-family: var(--font-label);
  font-size: var(--step-label);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-section__body {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.4vw, 24px);
  min-width: 0;
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.005em;
  max-width: 26ch;
  text-wrap: balance;
}

.page-about .about-p {
  margin: 0;
  max-width: 62ch;
  font-family: var(--font-body);
  font-size: var(--step-body);
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-about .about-link {
  color: var(--jade);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 196, 182, 0.45);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--coral);
  border-bottom-color: var(--coral);
}

/* ---------- 自述拆栏 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.2vw, 38px);
  align-items: start;
}

.page-about .about-split__text {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.page-about .about-figure {
  margin: 0;
  border: 2px solid var(--mist-dim);
  background: var(--ink-deep);
  box-shadow: 8px 8px 0 var(--slate);
}

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

.page-about .about-figure figcaption {
  border-top: 1px solid var(--about-line);
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: 2px solid var(--mist-dim);
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .about-tl {
  position: relative;
  padding-bottom: 4px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--ink);
  background: var(--sand);
}

.page-about .about-tl--product::before {
  background: var(--jade);
}

.page-about .about-tl__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1;
  color: var(--sand);
  letter-spacing: 0.02em;
}

.page-about .about-tl__kind {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--font-label);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--sand);
  padding: 2px 7px;
}

.page-about .about-tl--product .about-tl__kind {
  background: var(--jade);
}

.page-about .about-tl__title {
  margin: 10px 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-tl__desc {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 标签目录 ---------- */
.page-about .about-taglist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px 22px;
}

.page-about .about-taglist li {
  border-top: 2px solid var(--jade);
  padding: 11px 0 14px;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-taglist li:hover,
.page-about .about-taglist li:focus-within {
  border-top-color: var(--coral);
  transform: translateY(-2px);
}

.page-about .about-taglist__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--sand);
}

.page-about .about-taglist h3 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-taglist p {
  margin: 6px 0 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-roles li {
  border: 2px solid var(--about-line);
  background: rgba(38, 54, 77, 0.5);
  padding: 16px 16px 18px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-roles li:hover,
.page-about .about-roles li:focus-within {
  transform: translateY(-2px);
  border-color: var(--coral);
  background: rgba(38, 54, 77, 0.85);
}

.page-about .about-roles__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--jade);
}

.page-about .about-roles h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-roles p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-dim);
}

.page-about .about-roles__scene {
  display: block;
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px dashed var(--about-line);
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
}

.page-about .about-metrics li {
  border-left: 3px solid var(--sand);
  padding-left: 13px;
}

.page-about .about-metrics__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.2vw, 32px);
  line-height: 1;
  color: var(--sand);
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-partners li {
  border-left: 3px solid var(--jade-deep);
  background: rgba(20, 107, 102, 0.12);
  padding: 14px 16px;
}

.page-about .about-partners h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-partners p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-dim);
}

/* ---------- 服务流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-step__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.3;
  color: var(--coral);
}

.page-about .about-step__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .about-step__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(40px, 6vw, 72px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-cta__inner {
  border: 2px solid var(--coral);
  border-left-width: 8px;
  background: var(--ink-deep);
  padding: clamp(22px, 4vw, 42px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 30px);
  align-items: center;
}

.page-about .about-cta__inner .about-p {
  margin-top: 12px;
  max-width: 54ch;
}

.page-about .about-cta .btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-taglist {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 26px;
  }

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

@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-step {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 18px;
    padding: 22px 0;
  }

  .page-about .about-timeline {
    padding-left: 0;
    border-left: 0;
    border-top: 2px solid var(--mist-dim);
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 28px;
    padding-top: 26px;
  }

  .page-about .about-tl {
    padding-top: 0;
  }

  .page-about .about-tl::before {
    left: 0;
    top: -36px;
  }
}

@media (min-width: 880px) {
  .page-about .about-section__inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }

  .page-about .about-section__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 24px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    gap: clamp(24px, 4vw, 48px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-taglist {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-taglist li,
  .page-about .about-roles li,
  .page-about .about-link,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .about-taglist li:hover,
  .page-about .about-taglist li:focus-within,
  .page-about .about-roles li:hover,
  .page-about .about-roles li:focus-within {
    transform: none;
  }
}
<<<END>>>