.page-about {
  --about-rail-w: 208px;
  --about-hair: 1px solid rgba(23, 20, 18, 0.14);
  background: var(--paper);
  color: var(--ink);
}

.page-about .container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: 24px;
  padding-bottom: 0;
  overflow: hidden;
  background:
    radial-gradient(120% 80% at 82% -14%, rgba(201, 162, 39, 0.24), transparent 62%),
    radial-gradient(90% 62% at 4% 0%, rgba(183, 40, 46, 0.1), transparent 58%);
}

.page-about .about-hero .breadcrumb {
  font-size: 13px;
  margin-bottom: 20px;
}

.page-about .about-hero__eyebrow {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cinnabar);
  margin: 0 0 10px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 6.4vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  max-width: 17ch;
  color: var(--ink);
}

.page-about .about-hero__lede {
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 26px 0 0;
  padding: 1px;
  background: rgba(23, 20, 18, 0.14);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .fact {
  background: var(--paper);
  padding: 14px 16px 16px;
}

.page-about .fact__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--warm-gray);
  letter-spacing: 0.04em;
}

.page-about .fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  line-height: 1.2;
  color: var(--cinnabar);
  margin: 4px 0 0;
}

.page-about .fact__num span {
  font-size: 14px;
  color: var(--warm-gray);
  margin-left: 2px;
  letter-spacing: 0;
}

.page-about .about-hero__figure {
  margin: 34px 0 0;
  padding: 0;
  border-top: 2px solid var(--gold);
  position: relative;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  left: 0;
  top: -7px;
  width: 12px;
  height: 12px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  filter: saturate(0.94);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding: 44px 0 68px;
}

.page-about .about-layout {
  display: grid;
  gap: 30px;
  min-width: 0;
}

.page-about .about-rail__label {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--warm-gray);
  margin: 0 0 10px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-block;
  white-space: nowrap;
  font-size: 13px;
  line-height: 1.6;
  padding: 5px 12px;
  border: 1px solid rgba(23, 20, 18, 0.16);
  border-radius: 999px;
  color: var(--ink-soft);
  text-decoration: none;
  transition: border-color 240ms var(--ease), color 240ms var(--ease), background-color 240ms var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--gold);
  color: var(--cinnabar);
  background: rgba(201, 162, 39, 0.1);
}

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

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding: 30px 0 38px;
  border-top: var(--about-hair);
  scroll-margin-top: 84px;
}

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

.page-about .chapter__eyebrow {
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
  margin: 0 0 8px;
}

.page-about .chapter__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  max-width: 21ch;
}

.page-about .chapter__claim {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  border-left: 3px solid var(--gold);
  padding-left: 14px;
  margin: 0 0 22px;
  max-width: 66ch;
}

.page-about .prose p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 68ch;
  margin: 0 0 14px;
}

/* ---------- 四条产品线 ---------- */
.page-about .lines {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .lines__item {
  padding-left: 16px;
  border-left: 2px solid var(--gold-light);
}

.page-about .lines__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .lines__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
  max-width: 56ch;
}

/* ---------- 四步方法 ---------- */
.page-about .steps {
  counter-reset: step;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .steps__item {
  counter-increment: step;
  position: relative;
  padding: 0 0 28px 56px;
}

.page-about .steps__item::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cinnabar);
  background: var(--glow);
  border: 1px solid rgba(201, 162, 39, 0.55);
  border-radius: 50%;
}

.page-about .steps__item::after {
  content: "";
  position: absolute;
  left: 18px;
  top: 44px;
  bottom: 8px;
  width: 1px;
  background: rgba(23, 20, 18, 0.14);
}

.page-about .steps__item:last-child {
  padding-bottom: 0;
}

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

.page-about .steps__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.45;
  margin: 4px 0 8px;
  color: var(--ink);
}

.page-about .steps__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 10px;
  max-width: 62ch;
}

.page-about .steps__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

.page-about .steps__meta span {
  font-size: 13px;
  line-height: 1.6;
  color: var(--warm-gray);
  background: var(--glow);
  border-radius: 999px;
  padding: 3px 11px;
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 10 / 7;
  border-radius: var(--radius);
  border: 1px solid rgba(23, 20, 18, 0.1);
}

.page-about .about-figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__caption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--warm-gray);
  margin-top: 8px;
}

/* ---------- 区域网络 ---------- */
.page-about .regions {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .region {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 14px;
  background: var(--paper);
  border: 1px solid rgba(23, 20, 18, 0.16);
  border-radius: var(--radius);
  transition: transform 240ms var(--ease), border-color 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .region:hover,
.page-about .region:focus-within {
  transform: translateY(-2px);
  border-color: var(--gold);
  box-shadow: 0 6px 18px rgba(23, 20, 18, 0.08);
}

.page-about .region__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
}

.page-about .region__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  line-height: 1.2;
  color: var(--sea);
}

.page-about .region__unit {
  font-size: 12px;
  color: var(--warm-gray);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin: 24px 0 20px;
}

.page-about .team-card {
  padding: 18px 18px 20px;
  background: var(--glow);
  border-radius: var(--radius);
  border-left: 3px solid var(--celadon);
}

.page-about .team-card__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 34px;
  line-height: 1.1;
  color: var(--celadon);
  margin: 0;
}

.page-about .team-card__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  margin: 6px 0 6px;
  color: var(--ink);
}

.page-about .team-card__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0;
}

.page-about .certs {
  margin-top: 22px;
  border-top: var(--about-hair);
}

.page-about .certs__item {
  border-bottom: var(--about-hair);
}

.page-about .certs__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 15px 2px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.page-about .certs__head::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cinnabar);
  flex: none;
}

.page-about .certs__item[open] .certs__head::after {
  content: "−";
}

.page-about .certs__body {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 16px;
  padding-left: 2px;
  max-width: 64ch;
}

/* ---------- 里程碑（深色区） ---------- */
.page-about .chapter--ink {
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(201, 162, 39, 0.16), transparent 58%),
    var(--ink);
  color: var(--paper);
  border-radius: 8px;
  border-top: 0;
  padding: 30px 20px 34px;
  margin: 8px 0;
}

.page-about .chapter--ink .chapter__eyebrow {
  color: var(--gold-light);
}

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

.page-about .chapter--ink .chapter__claim {
  color: rgba(247, 241, 230, 0.84);
  border-left-color: var(--gold);
}

.page-about .milestones {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .milestones > li {
  position: relative;
  padding-left: 28px;
  border-left: 1px solid rgba(232, 212, 138, 0.32);
  margin-left: 8px;
  padding-bottom: 6px;
}

.page-about .milestones > li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 18px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .milestones > li:last-child {
  border-left-color: transparent;
}

.page-about .milestone {
  padding: 4px 0 12px;
}

.page-about .milestone__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  padding: 6px 0;
}

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

.page-about .milestone__num {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .milestone__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--paper);
}

.page-about .milestone__lead {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 241, 230, 0.7);
  flex: 1 1 14ch;
}

.page-about .milestone__head::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--gold-light);
  flex: none;
}

.page-about .milestone[open] .milestone__head::after {
  content: "－";
}

.page-about .milestone__body {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247, 241, 230, 0.82);
  margin: 2px 0 0;
  max-width: 60ch;
}

/* ---------- 合作生态 ---------- */
.page-about .partners {
  list-style: none;
  margin: 24px 0 20px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .partners__item {
  padding: 16px 16px 18px;
  background: var(--paper);
  border: 1px solid rgba(23, 20, 18, 0.14);
  border-top: 2px solid var(--sea);
  border-radius: var(--radius);
}

.page-about .partners__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1.1;
  color: var(--sea);
  margin: 0 0 4px;
}

.page-about .partners__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  margin: 0 0 6px;
  color: var(--ink);
}

.page-about .partners__text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  margin-top: 34px;
  padding: 26px 20px 24px;
  background: linear-gradient(140deg, var(--cinnabar), var(--cinnabar-deep));
  color: var(--paper);
  border-radius: 8px;
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.6vw, 26px);
  line-height: 1.35;
  margin: 0 0 10px;
}

.page-about .about-cta__text {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 241, 230, 0.88);
  margin: 0 0 18px;
  max-width: 56ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 12px;
}

.page-about .about-cta__actions .btn--gold {
  border-color: var(--gold-light);
}

.page-about .about-cta__actions .btn--ghost {
  color: var(--paper);
  border-color: rgba(247, 241, 230, 0.55);
}

.page-about .about-cta__actions .btn--ghost:hover,
.page-about .about-cta__actions .btn--ghost:focus-visible {
  border-color: var(--gold-light);
  color: var(--gold-light);
}

.page-about .about-cta__links {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(247, 241, 230, 0.82);
  margin: 0;
}

.page-about .about-cta__links a {
  color: var(--gold-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  color: var(--paper);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 26px;
  }

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

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

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

  .page-about .chapter--ink {
    padding: 34px 28px 38px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero__figure {
    max-width: var(--maxw);
    margin-left: auto;
    margin-right: auto;
    margin-top: 42px;
    padding: 0 var(--pad);
  }

  .page-about .about-hero__figure img {
    border-radius: var(--radius);
  }

  .page-about .about-body {
    padding: 56px 0 84px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 84px;
    padding-top: 4px;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    border-left: 1px solid rgba(23, 20, 18, 0.16);
    padding: 0;
  }

  .page-about .about-rail__link {
    display: block;
    border: 0;
    border-radius: 0;
    background: none;
    padding: 7px 0 7px 14px;
    margin-left: -1px;
    border-left: 2px solid transparent;
    white-space: normal;
    font-size: 14px;
    transition: color 240ms var(--ease), border-color 240ms var(--ease), background-color 240ms var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(201, 162, 39, 0.1);
    border-left-color: var(--gold);
    color: var(--cinnabar);
  }

  .page-about .chapter {
    padding: 40px 0 48px;
  }

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

  .page-about .steps__item {
    padding-left: 66px;
  }

  .page-about .chapter--ink {
    padding: 40px 36px 44px;
    margin: 16px 0;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__lede {
    font-size: 17px;
  }

  .page-about .fact__num {
    font-size: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .region,
  .page-about .about-rail__link {
    transition: none;
  }

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