.page-about {
  --about-rail-w: 172px;
  --about-gap: clamp(28px, 4vw, 64px);
  color: var(--ink);
}

.page-about .wrap {
  width: 100%;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: var(--sp-2);
  color: rgba(111, 139, 128, 0.7);
}

.page-about .breadcrumbs__item a {
  color: var(--gold-bright);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .breadcrumbs__item a:hover,
.page-about .breadcrumbs__item a:focus-visible {
  border-bottom-color: var(--gold-bright);
}

.page-about .breadcrumbs__item[aria-current="page"] {
  color: rgba(244, 240, 230, 0.62);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(44px, 7vw, 88px);
  background-color: var(--night);
  background-image:
    radial-gradient(circle at 84% 8%, rgba(201, 162, 39, 0.16), transparent 56%),
    linear-gradient(180deg, rgba(7, 26, 20, 0.6), rgba(11, 36, 28, 0) 70%);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line-night);
  border-radius: var(--radius-lg);
  padding: clamp(26px, 4.5vw, 54px) clamp(20px, 4vw, 52px);
  background: linear-gradient(158deg, rgba(46, 125, 107, 0.26), rgba(7, 26, 20, 0.62) 64%);
  overflow: hidden;
}

.page-about .about-hero__frame::before,
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid var(--gold);
  opacity: 0.72;
  pointer-events: none;
}

.page-about .about-hero__frame::before {
  top: 12px;
  left: 12px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero__frame::after {
  right: 12px;
  bottom: 12px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: var(--sp-3) 0 var(--sp-4);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.84);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 4vw, 46px);
  background: var(--line-night);
  border: 1px solid var(--line-night);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  padding: var(--sp-3) clamp(12px, 2vw, 20px);
  background: rgba(7, 26, 20, 0.78);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold-bright);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  margin-left: 2px;
  font-size: 0.58em;
  font-weight: 600;
  color: var(--gold);
}

.page-about .about-stat__key {
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: rgba(244, 240, 230, 0.6);
}

/* ---------- 缘起 ---------- */
.page-about .about-origin {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-origin__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-origin__eyebrow,
.page-about .about-net__eyebrow,
.page-about .about-archive__eyebrow,
.page-about .about-legal__eyebrow {
  margin: 0 0 var(--sp-3);
  color: var(--felt);
}

.page-about .about-origin__text .h2 {
  margin: 0 0 var(--sp-4);
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.24;
  color: var(--night);
}

.page-about .about-origin__text p {
  margin: 0 0 var(--sp-3);
  max-width: 60ch;
  font-size: var(--step-3);
  line-height: 1.85;
  color: rgba(23, 19, 16, 0.82);
}

.page-about .about-origin__list {
  margin: var(--sp-4) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-origin__list li {
  position: relative;
  padding-left: var(--sp-5);
  font-size: var(--step-3);
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-origin__list li::before {
  content: "";
  position: absolute;
  top: 0.72em;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--gold);
}

.page-about .about-origin__media,
.page-about .about-net__media,
.page-about .about-archive__media {
  margin: 0;
}

.page-about .about-origin__media img,
.page-about .about-net__media img,
.page-about .about-archive__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
}

.page-about .about-origin__media {
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 42px rgba(11, 36, 28, 0.16);
  overflow: hidden;
}

.page-about .media-frame__caption {
  margin-top: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.06em;
  color: var(--sage);
}

.page-about .about-net .media-frame__caption,
.page-about .about-hero .media-frame__caption {
  color: rgba(244, 240, 230, 0.55);
}

/* ---------- 时间轴 ---------- */
.page-about .about-stages {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-stages__head .section-head__title,
.page-about .about-fair__head .section-head__title,
.page-about .about-service__head .section-head__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.24;
}

.page-about .about-stages__head .section-head__note,
.page-about .about-fair__head .section-head__note,
.page-about .about-service__head .section-head__note {
  max-width: 56ch;
}

.page-about .about-stages__body {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-rail__list {
  display: flex;
  gap: var(--sp-2);
  margin: 0;
  padding: 0 0 var(--sp-2);
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--night);
  background: rgba(244, 240, 230, 0.9);
  border-left: 2px solid transparent;
  transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.page-about .about-rail__link:hover {
  background: rgba(201, 162, 39, 0.18);
  border-left-color: var(--gold);
  transform: translateY(-2px);
}

.page-about .about-rail__link:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 2px;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--step-2);
  letter-spacing: 0.06em;
  color: var(--felt);
  font-variant-numeric: tabular-nums;
}

.page-about .about-rail__name {
  font-size: var(--step-2);
  letter-spacing: 0.04em;
}

.page-about .about-stage-list {
  display: grid;
  gap: clamp(18px, 2.4vw, 28px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stage {
  position: relative;
  scroll-margin-top: 112px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--felt);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 0 rgba(23, 19, 16, 0.05);
  transition: transform var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease),
    border-color var(--t-mid) var(--ease);
}

.page-about .about-stage:hover,
.page-about .about-stage:focus-within {
  transform: translateY(-3px);
  border-left-color: var(--gold);
  box-shadow: 0 16px 36px rgba(11, 36, 28, 0.14);
}

.page-about .about-stage__tag {
  margin: 0 0 var(--sp-2);
  color: var(--gold);
}

.page-about .about-stage__title {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.35;
  color: var(--night);
}

.page-about .about-stage p {
  margin: 0 0 var(--sp-3);
  max-width: 62ch;
  font-size: var(--step-3);
  line-height: 1.85;
  color: rgba(23, 19, 16, 0.8);
}

.page-about .about-stage__meta {
  margin: var(--sp-4) 0 0;
  padding-top: var(--sp-3);
  border-top: 1px dashed var(--line);
  color: var(--sage);
}

/* ---------- 规则态度 ---------- */
.page-about .about-fair {
  padding: clamp(48px, 8vw, 96px) 0;
  background-color: var(--felt);
  background-image: linear-gradient(200deg, rgba(7, 26, 20, 0.55), rgba(27, 107, 82, 0.35));
}

.page-about .about-fair .section-head__index {
  color: var(--gold-bright);
}

.page-about .about-fair .section-head__title {
  color: var(--paper);
}

.page-about .about-fair .section-head__note {
  color: rgba(244, 240, 230, 0.76);
}

.page-about .about-fair__grid {
  display: grid;
  gap: var(--sp-4);
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-fair__card {
  padding: clamp(20px, 3vw, 32px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(244, 240, 230, 0.2);
  background: rgba(7, 26, 20, 0.42);
  backdrop-filter: blur(6px);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease),
    background var(--t-mid) var(--ease);
}

.page-about .about-fair__card:hover {
  transform: translateY(-3px);
  border-color: rgba(235, 203, 116, 0.6);
  background: rgba(7, 26, 20, 0.56);
}

.page-about .about-fair__value {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(38px, 5vw, 54px);
  line-height: 1;
  color: var(--gold-bright);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fair__title {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--step-4);
  color: var(--paper);
}

.page-about .about-fair__card p:last-child {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.84);
}

/* ---------- 节点 ---------- */
.page-about .about-net {
  padding: clamp(48px, 8vw, 96px) 0;
  background-color: var(--night);
  background-image: radial-gradient(circle at 14% 88%, rgba(46, 125, 107, 0.32), transparent 58%);
}

.page-about .about-net__eyebrow {
  color: var(--gold);
}

.page-about .about-net__title {
  margin: 0 0 var(--sp-4);
  max-width: 24ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-net__text p {
  margin: 0 0 var(--sp-3);
  max-width: 64ch;
  font-size: var(--step-3);
  line-height: 1.85;
  color: rgba(244, 240, 230, 0.82);
}

.page-about .about-net__list {
  display: grid;
  gap: var(--sp-3);
  margin: var(--sp-5) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-net__list li {
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--line-night);
  border-left: 2px solid var(--gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(7, 26, 20, 0.45);
  font-size: var(--step-3);
  line-height: 1.75;
  color: rgba(244, 240, 230, 0.8);
}

.page-about .about-net__list strong {
  color: var(--gold-bright);
  font-weight: 600;
}

.page-about .about-net__media {
  margin-top: clamp(28px, 4vw, 52px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-night);
  padding: var(--sp-2);
  background: rgba(46, 125, 107, 0.14);
  overflow: hidden;
}

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

/* ---------- 档案室 ---------- */
.page-about .about-archive {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-archive__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-archive__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 18px 42px rgba(11, 36, 28, 0.16);
}

.page-about .about-archive__eyebrow {
  margin: 0 0 var(--sp-3);
  color: var(--felt);
}

.page-about .about-archive__text .h2 {
  margin: 0 0 var(--sp-4);
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.24;
  color: var(--night);
}

.page-about .about-archive__text p {
  margin: 0 0 var(--sp-3);
  max-width: 60ch;
  font-size: var(--step-3);
  line-height: 1.85;
  color: rgba(23, 19, 16, 0.82);
}

.page-about .about-archive__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--sp-3);
  margin: var(--sp-5) 0;
  padding-top: var(--sp-4);
  border-top: 1px dashed var(--line);
}

.page-about .about-archive__stat {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.page-about .about-archive__stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  color: var(--felt-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .about-archive__unit {
  margin-left: 2px;
  font-size: 0.5em;
  font-weight: 600;
  color: var(--sage);
}

.page-about .about-archive__stat-key {
  font-size: var(--step-1);
  letter-spacing: 0.08em;
  color: var(--sage);
}

.page-about .about-archive__link {
  display: inline-block;
  font-size: var(--step-3);
  color: var(--felt);
  text-decoration: none;
  border-bottom: 2px solid var(--gold);
  padding-bottom: 2px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-archive__link:hover,
.page-about .about-archive__link:focus-visible {
  color: var(--night);
  border-bottom-color: var(--gold-bright);
}

/* ---------- 服务团队 ---------- */
.page-about .about-service {
  padding: clamp(48px, 8vw, 96px) 0;
  background-color: var(--paper-warm);
}

.page-about .about-service__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-service__card {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  border-top: 3px solid var(--gold);
  background: var(--paper);
  transition: transform var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}

.page-about .about-service__card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(11, 36, 28, 0.12);
}

.page-about .about-service__title {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--step-4);
  line-height: 1.35;
  color: var(--night);
}

.page-about .about-service__card p {
  margin: 0;
  font-size: var(--step-3);
  line-height: 1.85;
  color: rgba(23, 19, 16, 0.8);
}

.page-about .about-service__actions {
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-service__actions .btn {
  text-decoration: none;
}

/* ---------- 备案信息 ---------- */
.page-about .about-legal {
  padding: clamp(40px, 6vw, 76px) 0;
  background-color: var(--paper);
  border-top: 1px solid var(--line);
}

.page-about .about-legal__eyebrow {
  margin: 0 0 var(--sp-3);
  color: var(--sage);
}

.page-about .about-legal__title {
  margin: 0 0 var(--sp-5);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.3;
  color: var(--night);
}

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

.page-about .about-legal__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  background: var(--paper);
}

.page-about .about-legal__key {
  margin: 0;
  color: var(--sage);
}

.page-about .about-legal__val {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--step-3);
  letter-spacing: 0.02em;
  color: var(--night);
  font-variant-numeric: tabular-nums;
}

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

@media (min-width: 900px) {
  .page-about .about-stages__body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__link {
    align-items: baseline;
    padding: var(--sp-3) var(--sp-3) var(--sp-3) var(--sp-4);
    border-radius: 0 var(--radius) var(--radius) 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    background: transparent;
  }

  .page-about .about-rail__link:hover {
    background: rgba(201, 162, 39, 0.16);
    transform: translateX(2px);
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

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

  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-service__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

  .page-about .about-stage:hover,
  .page-about .about-stage:focus-within,
  .page-about .about-fair__card:hover,
  .page-about .about-service__card:hover,
  .page-about .about-rail__link:hover {
    transform: none;
  }
}
<<<END>>>