.page-about {
  --about-hero-radius: 40px;
  background: var(--cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4.6vw, 46px) 0 clamp(58px, 8vw, 110px);
  background:
    linear-gradient(158deg, var(--gold-soft) 0%, rgba(246, 223, 164, .55) 34%, var(--cream) 72%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: clamp(40px, 7vw, 78px);
  background: var(--cream);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  color: var(--tea);
  margin-bottom: clamp(16px, 3vw, 26px);
}

.page-about .breadcrumbs a {
  color: var(--tea);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 1px;
}

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

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

.page-about .eyebrow {
  margin: 0 0 10px;
  font-size: .8rem;
  letter-spacing: .22em;
  color: var(--yin);
  font-weight: 700;
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(2rem, 6.2vw, 3.9rem);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--ink);
  max-width: 20ch;
}

.page-about .lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.14rem);
  line-height: 1.9;
  color: var(--rock);
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-hero__facts li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--pill);
  border: 1px solid rgba(26, 21, 18, .1);
  background: rgba(251, 247, 240, .78);
  font-size: .86rem;
  color: var(--rock);
}

.page-about .about-hero__facts .num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--peacock-deep);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  padding: clamp(34px, 5vw, 62px) 0 0;
}

.page-about .about-rail {
  border-top: 3px solid var(--gold);
  padding-top: 14px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: .72rem;
  letter-spacing: .24em;
  color: var(--tea);
  font-weight: 700;
}

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

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  min-height: 44px;
  padding: 12px 16px;
  border-radius: var(--pill);
  background: rgba(26, 21, 18, .05);
  color: var(--rock);
  font-size: .88rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background .2s ease, color .2s ease;
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  background: var(--gold-soft);
  color: var(--ink);
}

.page-about .about-rail__list .num {
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 600;
  color: var(--yin);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-bottom: clamp(44px, 6.5vw, 82px);
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line);
  padding-top: clamp(38px, 5.6vw, 70px);
}

.page-about .sec-head {
  margin-bottom: clamp(22px, 3.4vw, 34px);
}

.page-about .sec-head__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(2.3rem, 6.6vw, 4.2rem);
  line-height: .92;
  letter-spacing: -.03em;
  color: var(--gold);
}

.page-about .sec-head__title {
  margin: 6px 0 12px;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.1vw, 2.05rem);
  line-height: 1.28;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .sec-head__desc {
  margin: 0;
  max-width: 62ch;
  font-size: .97rem;
  line-height: 1.9;
  color: var(--rock);
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: .97rem;
  line-height: 1.92;
  color: var(--rock);
}

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

.page-about .prose a {
  color: var(--peacock-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--peacock);
  padding-bottom: 1px;
}

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

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 28px);
  align-items: center;
}

/* ---------- 图片 ---------- */
.page-about .media-frame {
  margin: 0;
  border-radius: var(--r-xl);
  overflow: hidden;
  background: var(--gold-soft);
  box-shadow: var(--shadow-card);
}

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

.page-about .media-frame__cap {
  padding: 11px 18px 13px;
  background: rgba(251, 247, 240, .9);
  font-size: .8rem;
  line-height: 1.6;
  color: var(--tea);
}

/* ---------- 大数字 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-stat {
  padding: 22px 20px 20px;
  border-radius: var(--r-l);
  background: #fff;
  border-top: 5px solid var(--gold);
  box-shadow: var(--shadow-card);
}

.page-about .about-stat:nth-child(1) {
  border-top-color: var(--yin);
}

.page-about .about-stat:nth-child(3) {
  border-top-color: var(--peacock);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(2rem, 5.2vw, 2.9rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}

.page-about .about-stat__unit {
  margin-left: 5px;
  font-size: .95rem;
  font-weight: 600;
  color: var(--tea);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: .92rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-stat__note {
  display: block;
  margin-top: 6px;
  font-size: .82rem;
  line-height: 1.65;
  color: var(--tea);
}

/* ---------- 分段切换 ---------- */
.page-about .about-tabs {
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-tabs .tabs__tab {
  appearance: none;
  min-height: 44px;
  padding: 11px 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  background: transparent;
  color: var(--rock);
  font: inherit;
  font-size: .92rem;
  font-weight: 700;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}

.page-about .about-tabs .tabs__tab[aria-selected="true"] {
  background: var(--yin);
  border-color: var(--yin);
  color: #fff;
}

.page-about .about-tabs .tabs__tab:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.page-about .about-tabs .tabs__panel {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--r-l);
  background: var(--cream);
  border-left: 5px solid var(--peacock);
}

.page-about .about-tabs .tabs__panel[hidden] {
  display: none;
}

.page-about .about-role__lead {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: .97rem;
  line-height: 1.9;
  color: var(--rock);
}

.page-about .tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
}

.page-about .about-role__note {
  margin: 0;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--tea);
}

/* ---------- 对照表 ---------- */
.page-about .about-table-block {
  margin-top: clamp(28px, 4.4vw, 44px);
}

.page-about .about-table-block h3 {
  margin: 0 0 14px;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-table-scroll {
  overflow-x: auto;
  border-radius: var(--r-l);
  border: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: .92rem;
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 15px 18px;
  text-align: left;
  vertical-align: top;
}

.page-about .about-table thead th {
  background: var(--ink);
  color: var(--cream);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .1em;
  white-space: nowrap;
}

.page-about .about-table tbody th {
  background: var(--cream);
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}

.page-about .about-table tbody td {
  color: var(--rock);
  line-height: 1.75;
  border-top: 1px solid var(--line);
}

.page-about .about-table tbody tr:nth-child(even) td {
  background: var(--gold-soft);
}

.page-about .about-table tbody tr:nth-child(even) th {
  background: var(--gold-soft);
}

/* ---------- 覆盖规模 ---------- */
.page-about .about-network {
  display: grid;
  gap: 14px;
}

.page-about .about-metric {
  padding: 20px 18px;
  border-radius: var(--r-m);
  background: var(--cream);
  border-bottom: 4px solid var(--peacock);
}

.page-about .about-metric__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(1.8rem, 4.4vw, 2.5rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--peacock-deep);
}

.page-about .about-metric__label {
  display: block;
  margin-top: 9px;
  font-size: .85rem;
  color: var(--rock);
}

.page-about .about-network__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  max-width: 64ch;
  font-size: .95rem;
  line-height: 1.9;
  color: var(--rock);
  padding-left: 18px;
  border-left: 3px solid var(--gold);
}

/* ---------- 参数带 ---------- */
.page-about .param {
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .param__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .param__key {
  font-size: .9rem;
  color: var(--rock);
}

.page-about .param__val {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: .98rem;
  color: var(--peacock-deep);
  white-space: nowrap;
}

/* ---------- 时间刻度 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 26px 26px;
  border-left: 2px solid var(--gold-soft);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--cream);
}

.page-about .timeline__item:last-child::before {
  background: var(--yin);
}

.page-about .timeline__label {
  display: block;
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--yin);
}

.page-about .timeline__title {
  margin: 5px 0 4px;
  font-family: var(--font-cn);
  font-size: 1.02rem;
  font-weight: 800;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .timeline__text a {
  color: var(--peacock-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--peacock);
}

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

/* ---------- 收尾行动 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  margin: 0 0 clamp(46px, 6.5vw, 82px);
  padding: clamp(28px, 5vw, 56px);
  border-radius: var(--about-hero-radius);
  background: var(--ink);
  color: var(--cream);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -58%;
  width: 62%;
  height: 360px;
  background: radial-gradient(closest-side, rgba(232, 178, 58, .42), rgba(232, 178, 58, 0) 72%);
  pointer-events: none;
}

.page-about .about-cta h2 {
  position: relative;
  margin: 0 0 16px;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.5vw, 2.3rem);
  line-height: 1.25;
  letter-spacing: .02em;
  color: var(--cream);
}

.page-about .about-cta p {
  position: relative;
  margin: 0 0 12px;
  max-width: 66ch;
  font-size: .95rem;
  line-height: 1.9;
  color: rgba(251, 247, 240, .82);
}

.page-about .about-cta__contact {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin: 22px 0 10px;
}

.page-about .about-cta__line {
  font-size: .9rem;
  color: rgba(251, 247, 240, .74);
}

.page-about .about-cta__line .num {
  font-family: var(--font-mono);
  color: var(--gold);
  font-weight: 600;
}

.page-about .about-cta .copy-btn {
  min-height: 44px;
  padding: 10px 18px;
  border-radius: var(--pill);
  border: 1px solid rgba(232, 178, 58, .6);
  background: transparent;
  color: var(--gold);
  font: inherit;
  font-size: .84rem;
  font-weight: 700;
  cursor: pointer;
}

.page-about .about-cta .copy-btn:hover,
.page-about .about-cta .copy-btn:focus-visible {
  background: rgba(232, 178, 58, .16);
  outline: none;
}

.page-about .about-cta .copy-btn:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.page-about .about-cta__addr {
  position: relative;
  font-size: .85rem;
  color: rgba(251, 247, 240, .62);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: 1.04fr .96fr;
    gap: clamp(26px, 4vw, 48px);
  }

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

  .page-about .timeline {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 4vw, 56px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(34px, 5vw, 68px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 84px;
    align-self: start;
    padding-top: 16px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list a {
    width: 100%;
    border-radius: var(--r-m);
    justify-content: flex-start;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    transition: none;
  }
}