.page-about {
  --about-fs-xs: 12px;
  --about-fs-sm: 14px;
  --about-fs-md: 16px;
  --about-fs-lg: 20px;
  --about-fs-xl: 26px;
  --about-fs-2xl: 34px;
  --about-fs-3xl: 44px;
  --about-hair: rgba(11, 37, 69, .1);
  --about-soft: rgba(230, 238, 247, .62);
  --about-tick: rgba(201, 162, 39, .5);
  background: var(--mist);
  color: var(--ink);
}

.page-about [data-reveal-ready] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

.page-about [data-reveal-ready].is-visible {
  opacity: 1;
  transform: none;
}

.page-about .about-crumbs {
  padding-top: 22px;
  padding-bottom: 2px;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  letter-spacing: .02em;
  font-weight: 700;
}

.page-about h1 {
  font-size: var(--about-fs-2xl);
  line-height: 1.26;
  margin-top: 14px;
}

.page-about h2 {
  font-size: var(--about-fs-xl);
  line-height: 1.34;
  margin-top: 10px;
}

.page-about .eyebrow {
  font-size: var(--about-fs-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-m);
  padding: 28px 20px 26px;
  background:
    radial-gradient(120% 92% at 90% 4%, rgba(111, 211, 188, .18), transparent 58%),
    radial-gradient(88% 80% at 2% 98%, rgba(201, 162, 39, .14), transparent 62%),
    var(--white);
  box-shadow: 0 26px 60px -46px rgba(11, 37, 69, .6);
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(to right, var(--about-tick) 0 1px, transparent 1px 18px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-hero__lede {
  margin-top: 16px;
  font-size: var(--about-fs-md);
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-hero__roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .role-item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 12px 14px;
  background: var(--about-soft);
  border-left: 2px solid var(--emerald);
  border-radius: var(--radius-s);
}

.page-about .role-item__id {
  font-size: var(--about-fs-xs);
  color: var(--emerald);
  padding-top: 3px;
  letter-spacing: .06em;
}

.page-about .role-item__body {
  font-size: var(--about-fs-sm);
  line-height: 1.8;
  color: var(--grey);
}

.page-about .role-item__body strong {
  display: block;
  color: var(--ink);
  font-size: var(--about-fs-sm);
  margin-bottom: 2px;
  letter-spacing: .01em;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
}

.page-about .about-hero__figure figcaption {
  margin-top: 10px;
  font-size: var(--about-fs-xs);
  letter-spacing: .04em;
  color: var(--grey);
}

/* ---------- 时间线 ---------- */

.page-about .about-track {
  background: var(--white);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-track__lede {
  margin-top: 14px;
  font-size: var(--about-fs-md);
  line-height: 1.9;
  color: var(--grey);
  max-width: 62ch;
}

.page-about .track {
  position: relative;
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 162, 39, .78), rgba(201, 162, 39, .1));
}

.page-about .track__node {
  position: relative;
  padding: 0 0 24px 40px;
}

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

.page-about .track__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 11px;
  height: 11px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--gold);
}

.page-about .track__year {
  display: block;
  font-size: var(--about-fs-sm);
  font-weight: 500;
  letter-spacing: .07em;
  color: var(--emerald);
  margin-bottom: 6px;
}

.page-about .track__panel {
  background: var(--white);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-s);
  padding: 14px 16px 16px;
  box-shadow: 0 16px 30px -28px rgba(11, 37, 69, .7);
}

.page-about .track__panel h3 {
  font-size: var(--about-fs-lg);
  line-height: 1.4;
  margin-bottom: 6px;
}

.page-about .track__panel p {
  margin: 0;
  font-size: var(--about-fs-sm);
  line-height: 1.85;
  color: var(--grey);
}

@media (min-width: 760px) {
  .page-about .track__node {
    display: grid;
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 24px;
    padding-left: 46px;
    align-items: start;
  }

  .page-about .track__node::before {
    top: 20px;
  }

  .page-about .track__year {
    text-align: right;
    padding-top: 16px;
    margin-bottom: 0;
  }
}

/* ---------- 目录体系 + 团队 ---------- */

.page-about .about-split {
  display: grid;
  gap: 44px;
}

.page-about .about-split__lede {
  margin-top: 14px;
  font-size: var(--about-fs-md);
  line-height: 1.9;
  color: var(--grey);
}

.page-about .about-split__lede .mono {
  color: var(--emerald);
  font-size: var(--about-fs-sm);
}

.page-about .about-split__figure {
  margin: 26px 0 0;
}

.page-about .about-split__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
}

.page-about .about-split__figure figcaption {
  margin-top: 10px;
  font-size: var(--about-fs-xs);
  letter-spacing: .04em;
  color: var(--grey);
}

.page-about .catalog-tree {
  margin-top: 26px;
}

.page-about .cat-node {
  background: var(--white);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-s);
  margin-bottom: 8px;
  overflow: hidden;
}

.page-about .cat-node[open] {
  border-color: rgba(201, 162, 39, .55);
  box-shadow: 0 14px 28px -26px rgba(11, 37, 69, .7);
}

.page-about .cat-node__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
  font-size: var(--about-fs-sm);
}

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

.page-about .cat-node__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--about-fs-md);
  line-height: 1;
  color: var(--grey);
  transition: color var(--dur) var(--ease);
}

.page-about .cat-node[open] .cat-node__head::after {
  content: "−";
  color: var(--emerald);
}

.page-about .cat-node__head:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: -2px;
}

.page-about .cat-node__id {
  font-size: var(--about-fs-xs);
  letter-spacing: .06em;
  color: var(--gold);
}

.page-about .cat-node__name {
  font-weight: 700;
  color: var(--ink);
  letter-spacing: .01em;
}

.page-about .cat-node__count {
  font-size: var(--about-fs-xs);
  color: var(--grey);
}

.page-about .cat-node__kids {
  list-style: none;
  margin: 0 0 4px 30px;
  padding: 2px 0 10px 16px;
  border-left: 1px solid rgba(201, 162, 39, .45);
}

.page-about .cat-node__kid {
  padding: 4px 0;
  font-size: var(--about-fs-sm);
  line-height: 1.7;
  color: var(--grey);
}

.page-about .cat-node__kid .mono {
  color: var(--emerald);
  margin-right: 8px;
  font-size: var(--about-fs-xs);
  letter-spacing: .06em;
}

.page-about .team-bars {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .team-bar__name {
  font-size: var(--about-fs-md);
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-bar__num {
  font-size: var(--about-fs-sm);
  color: var(--grey);
  letter-spacing: .04em;
}

.page-about .team-bar__track {
  height: 10px;
  border-radius: 999px;
  background: var(--shallow);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  transition: width 600ms var(--ease);
}

.page-about .team-bar:nth-child(1) .team-bar__fill {
  width: 42.9%;
  background: linear-gradient(90deg, var(--emerald), var(--emerald-lite));
}

.page-about .team-bar:nth-child(2) .team-bar__fill {
  width: 26.2%;
  background: linear-gradient(90deg, var(--hull), var(--hull-soft));
}

.page-about .team-bar:nth-child(3) .team-bar__fill {
  width: 31%;
  background: linear-gradient(90deg, var(--gold), var(--gold-lite));
}

.page-about .team-bar__note {
  margin-top: 8px;
  font-size: var(--about-fs-sm);
  line-height: 1.8;
  color: var(--grey);
}

@media (min-width: 980px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }
}

/* ---------- 内容生产与复核 ---------- */

.page-about .about-process__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-process__text {
  margin-top: 16px;
  font-size: var(--about-fs-md);
  line-height: 1.9;
  color: var(--grey);
  max-width: 58ch;
}

.page-about .process-flow {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .process-flow__step {
  background: var(--white);
  border: 1px solid var(--about-hair);
  border-top: 3px solid var(--emerald);
  border-radius: var(--radius-s);
  padding: 14px 16px 16px;
}

.page-about .process-flow__step:nth-child(2) {
  border-top-color: var(--hull);
}

.page-about .process-flow__step:nth-child(3) {
  border-top-color: var(--gold);
}

.page-about .process-flow__idx {
  font-size: var(--about-fs-xs);
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .process-flow__step h3 {
  font-size: var(--about-fs-md);
  margin: 6px 0 4px;
}

.page-about .process-flow__step p {
  margin: 0;
  font-size: var(--about-fs-sm);
  line-height: 1.8;
  color: var(--grey);
}

.page-about .about-process__figure {
  margin: 0;
}

.page-about .about-process__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  background: var(--white);
}

.page-about .about-process__figure figcaption {
  margin-top: 10px;
  font-size: var(--about-fs-xs);
  letter-spacing: .04em;
  color: var(--grey);
}

@media (min-width: 640px) {
  .page-about .process-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .page-about .about-process__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }
}

/* ---------- 覆盖范围 ---------- */

.page-about .about-reach__panel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-m);
  padding: 34px 22px 32px;
  background:
    radial-gradient(94% 130% at 94% 0%, rgba(14, 124, 102, .55), transparent 62%),
    radial-gradient(72% 110% at 0% 100%, rgba(201, 162, 39, .22), transparent 62%),
    var(--abyss);
  color: var(--text-on-dark);
}

.page-about .about-reach__panel::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background-image: repeating-linear-gradient(to right, rgba(240, 217, 138, .8) 0 1px, transparent 1px 22px);
}

.page-about .about-reach__panel .eyebrow {
  color: var(--gold-lite);
}

.page-about .about-reach__panel h2 {
  color: var(--white);
}

.page-about .about-reach__text {
  margin-top: 14px;
  font-size: var(--about-fs-md);
  line-height: 1.9;
  color: var(--text-on-dark);
  max-width: 56ch;
}

.page-about .reach-stats {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .reach-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--about-fs-2xl);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--gold-lite);
  font-variant-numeric: tabular-nums;
}

.page-about .reach-stat__label {
  display: block;
  margin-top: 8px;
  font-size: var(--about-fs-sm);
  line-height: 1.6;
  color: var(--text-on-dark);
}

@media (min-width: 720px) {
  .page-about .about-reach__panel {
    padding: 46px 44px 44px;
  }

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

  .page-about .reach-stat {
    padding-left: 28px;
  }

  .page-about .reach-stat:first-child {
    padding-left: 0;
  }

  .page-about .reach-stat + .reach-stat {
    border-left: 1px solid rgba(201, 162, 39, .38);
  }
}

/* ---------- 白皮书收束 ---------- */

.page-about .about-paper__inner {
  position: relative;
  max-width: 760px;
  padding-top: 42px;
}

.page-about .about-paper__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 68px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.page-about .about-paper__inner p {
  margin-top: 18px;
  font-size: var(--about-fs-md);
  line-height: 1.95;
  color: var(--grey);
  max-width: 62ch;
}

.page-about .about-paper__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-paper__alt {
  margin-top: 18px;
  font-size: var(--about-fs-sm);
  color: var(--grey);
}

.page-about .about-paper__alt a {
  color: var(--emerald);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

@media (min-width: 940px) {
  .page-about h1 {
    font-size: var(--about-fs-3xl);
  }

  .page-about h2 {
    font-size: var(--about-fs-2xl);
  }

  .page-about .about-hero__frame {
    padding: 40px 38px 38px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: 48px;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal-ready],
  .page-about [data-reveal-ready].is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .team-bar__fill {
    transition: none;
  }
}