.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--fb);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding-top: 20px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--stone);
}

.page-about .breadcrumbs a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .18s ease;
}

.page-about .breadcrumbs a:hover {
  border-bottom-color: var(--gold);
}

.page-about .kicker {
  font-family: var(--fm);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold-dk);
  text-transform: uppercase;
  margin: 0;
}

.page-about .section-head {
  max-width: 46em;
  margin-bottom: 34px;
}

.page-about .section-title {
  font-family: var(--fd);
  font-weight: 900;
  font-size: clamp(24px, 5.4vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 10px 0 14px;
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-about .about-intro {
  padding: 18px 0 58px;
  border-bottom: 1px solid var(--line-light);
}

.page-about .intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .intro-title {
  font-family: var(--fd);
  font-weight: 900;
  font-size: clamp(30px, 8vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  margin: 16px 0 20px;
  color: var(--ink);
}

.page-about .intro-title em {
  font-style: normal;
  color: var(--gold-dk);
  background: linear-gradient(transparent 62%, rgba(201, 162, 39, .3) 62%);
}

.page-about .intro-lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 36em;
  margin: 0;
}

.page-about .intro-index {
  list-style: none;
  margin: 28px 0 0;
  padding: 20px 22px;
  background: var(--paper-2);
  clip-path: var(--cut12);
  display: grid;
  gap: 12px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-2);
}

.page-about .intro-index li {
  display: flex;
  gap: 14px;
  align-items: baseline;
}

.page-about .intro-index .idx {
  font-family: var(--fm);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold-dk);
  flex: none;
}

.page-about .intro-figure {
  margin: 0;
}

.page-about .intro-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  clip-path: var(--cut12);
  filter: saturate(.94) contrast(1.02);
}

.page-about .intro-figure .media-caption {
  display: block;
  margin-top: 12px;
  font-family: var(--fm);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone);
}

/* ---------- 版本主张 ---------- */

.page-about .about-claim {
  padding: 56px 0 60px;
  background: var(--paper-2);
}

.page-about .claim-lede,
.page-about .evo-lede,
.page-about .scale-lede,
.page-about .partner-lede,
.page-about .legal-lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 36em;
  margin: 0;
}

.page-about .ver-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .about-vtab {
  font-family: var(--fb);
  font-size: 14px;
  letter-spacing: .04em;
  padding: 10px 20px;
  border: 1px solid var(--line-light);
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  clip-path: var(--cut8);
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}

.page-about .about-vtab:hover {
  border-color: var(--gold);
}

.page-about .about-vtab[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  font-weight: 600;
}

.page-about .ver-panel {
  position: relative;
  background: var(--paper);
  padding: 28px 22px 26px 26px;
  margin-bottom: 18px;
}

.page-about .ver-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--stone);
}

.page-about .ver-panel[data-version-panel="经典中文版"]::before {
  background: var(--gold);
}

.page-about .ver-head {
  font-family: var(--fd);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.35;
  margin: 0 0 12px;
  color: var(--ink);
}

.page-about .ver-lede {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
  margin: 0 0 16px;
  max-width: 34em;
}

.page-about .ver-points {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ver-points li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .ver-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 11px;
  height: 1px;
  background: var(--gold);
}

.page-about .ver-for {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-light);
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 演进节点 ---------- */

.page-about .about-evo {
  padding: 56px 0 60px;
  background: var(--paper);
}

.page-about .evo-wrap {
  position: relative;
}

.page-about .evo-rail {
  display: none;
}

.page-about .evo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .evo-item {
  padding: 24px 0;
  border-top: 1px solid var(--line-light);
}

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

.page-about .evo-num {
  display: block;
  font-family: var(--fm);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold-dk);
  margin-bottom: 10px;
}

.page-about .evo-head {
  font-family: var(--fd);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.35;
  margin: 0 0 12px;
  color: var(--ink);
}

.page-about .evo-body p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-2);
  margin: 0 0 14px;
  max-width: 38em;
}

.page-about .evo-more summary {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--fm);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--stone);
  list-style: none;
}

.page-about .evo-more summary::-webkit-details-marker {
  display: none;
}

.page-about .evo-more summary::before {
  content: "+";
  font-weight: 700;
  color: var(--orange);
  font-size: 15px;
  line-height: 1;
}

.page-about .evo-more[open] summary::before {
  content: "−";
}

.page-about .evo-more p {
  margin: 12px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--gold-lt);
  font-size: 14px;
  color: var(--ink-2);
}

/* ---------- 服务覆盖与规模 ---------- */

.page-about .about-scale {
  position: relative;
  padding: 58px 0 62px;
  background: var(--ink);
  color: var(--paper);
  isolation: isolate;
}

.page-about .about-scale::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--grid-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-dark) 1px, transparent 1px);
  background-size: 52px 52px;
  pointer-events: none;
}

.page-about .about-scale .kicker {
  color: var(--gold-lt);
}

.page-about .about-scale .section-title {
  color: var(--paper);
}

.page-about .about-scale .scale-lede {
  color: rgba(246, 241, 230, .78);
}

.page-about .scale-figure {
  margin: 0 0 34px;
}

.page-about .scale-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: var(--cut12);
  opacity: .95;
}

.page-about .scale-figure .media-caption {
  display: block;
  margin-top: 12px;
  font-family: var(--fm);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone-lt);
}

.page-about .scale-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .scale-stats li {
  background: var(--ink-2);
  padding: 22px 20px;
  display: grid;
  gap: 8px;
}

.page-about .stat-num {
  font-family: var(--fm);
  font-size: 32px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold-lt);
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.page-about .stat-unit {
  font-size: 15px;
  color: var(--gold);
}

.page-about .stat-key {
  font-size: 13px;
  line-height: 1.6;
  color: var(--stone-lt);
  letter-spacing: .02em;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  padding: 56px 0 60px;
  background: var(--paper);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .team-lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 36em;
  margin: 0 0 26px;
}

.page-about .team-rows {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-light);
}

.page-about .team-rows li {
  display: grid;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .team-name {
  font-family: var(--fd);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
}

.page-about .team-count {
  font-family: var(--fm);
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .team-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-2);
}

.page-about .team-figure {
  margin: 0;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  clip-path: var(--cut12);
  filter: saturate(.92);
}

.page-about .team-figure .media-caption {
  display: block;
  margin-top: 12px;
  font-family: var(--fm);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--stone);
}

/* ---------- 协作生态 ---------- */

.page-about .about-partner {
  padding: 56px 0 60px;
  background: var(--paper-2);
}

.page-about .partner-board {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .partner-card {
  background: var(--paper);
  padding: 24px 22px;
  clip-path: var(--cut12);
  border-top: 3px solid var(--stone);
}

.page-about .partner-card:nth-child(2) {
  border-top-color: var(--gold);
}

.page-about .partner-card:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .partner-card-title {
  font-family: var(--fd);
  font-weight: 700;
  font-size: 18px;
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---------- 备案与服务地区 ---------- */

.page-about .about-legal {
  padding: 56px 0 72px;
  background: var(--paper);
}

.page-about .legal-plate {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-light);
  border: 1px solid var(--line-light);
}

.page-about .legal-plate > div {
  background: var(--paper);
  padding: 18px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
}

.page-about .legal-plate dt {
  flex: none;
  min-width: 78px;
  font-family: var(--fm);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--stone);
}

.page-about .legal-plate dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .legal-plate .mono,
.page-about .legal-plate dd .mono {
  font-family: var(--fm);
  font-size: 14px;
  letter-spacing: .04em;
}

.page-about .copy-btn {
  font-family: var(--fb);
  font-size: 12px;
  letter-spacing: .06em;
  padding: 6px 14px;
  border: 1px solid var(--line-light);
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  clip-path: var(--cut8);
  transition: background .18s ease, color .18s ease, border-color .18s ease;
}

.page-about .copy-btn:hover {
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .copy-btn.is-copied {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .legal-foot {
  margin: 28px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--stone);
  max-width: 42em;
}

.page-about .legal-foot a {
  color: var(--stone);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
  transition: color .18s ease;
}

.page-about .legal-foot a:hover {
  color: var(--ink);
}

/* ---------- 桌面端 ---------- */

@media (min-width: 720px) {
  .page-about .scale-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .partner-card:nth-child(3) {
    grid-column: 1 / -1;
  }

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

@media (min-width: 1000px) {
  .page-about .about-intro {
    padding: 28px 0 72px;
  }

  .page-about .intro-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .intro-index {
    grid-template-columns: 1fr;
    padding: 24px 26px;
  }

  .page-about .about-claim,
  .page-about .about-evo,
  .page-about .about-team,
  .page-about .about-partner,
  .page-about .about-legal {
    padding-top: 78px;
    padding-bottom: 82px;
  }

  .page-about .about-scale {
    padding: 80px 0 86px;
  }

  .page-about .ver-compare {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }

  .page-about .ver-tabs {
    grid-column: 1 / -1;
    margin-bottom: 4px;
  }

  .page-about .ver-panel {
    margin-bottom: 0;
    padding: 32px 28px 30px 32px;
  }

  .page-about .evo-wrap {
    padding-left: 68px;
  }

  .page-about .evo-rail {
    display: block;
    position: absolute;
    left: 6px;
    top: 8px;
    bottom: 8px;
    width: 40px;
    height: calc(100% - 16px);
  }

  .page-about .evo-item {
    display: grid;
    grid-template-columns: 74px minmax(0, 1fr);
    gap: 24px;
    padding: 30px 0;
  }

  .page-about .evo-item:first-child {
    padding-top: 6px;
  }

  .page-about .evo-num {
    margin-bottom: 0;
    padding-top: 6px;
  }

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

  .page-about .scale-stats li {
    padding: 30px 24px;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .team-rows li {
    grid-template-columns: minmax(0, auto) auto;
    align-items: baseline;
    gap: 6px 18px;
    padding: 22px 0;
  }

  .page-about .team-note {
    grid-column: 1 / -1;
  }

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

  .page-about .partner-card:nth-child(3) {
    grid-column: auto;
  }

  .page-about .partner-card {
    padding: 30px 26px;
  }

  .page-about .scale-figure {
    margin-bottom: 44px;
  }
}