.page-about .about-intro {
  padding-top: 40px;
}

.page-about .crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 32px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--slate-300);
}

.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-500);
}

.page-about .crumbs a {
  color: var(--cyan-400);
  text-decoration: none;
}

.page-about .crumbs a:hover {
  text-decoration: underline;
}

.page-about .about-intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-intro-copy h1 {
  margin: 14px 0 22px;
  max-width: 18ch;
}

.page-about .about-intro-copy .lede {
  max-width: 62ch;
}

.page-about .about-intro-note {
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: var(--hair);
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate-300);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-500);
  border: var(--line);
}

.page-about .about-fact {
  background: var(--ink-700);
  padding: 20px 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-fact-num {
  font-size: 34px;
  line-height: 1;
  color: var(--amber-400);
  letter-spacing: .04em;
}

.page-about .about-fact-unit {
  font-size: 16px;
  margin-left: 2px;
}

.page-about .about-fact-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--slate-300);
}

@media (min-width: 960px) {
  .page-about .about-intro {
    padding-top: 56px;
  }

  .page-about .about-intro-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 64px;
    align-items: end;
  }
}

/* 四条业务线 */
.page-about .about-team-figure {
  margin: 36px 0 0;
}

.page-about .about-role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 40px;
}

.page-about .about-role {
  position: relative;
  border: var(--line);
  border-top: 2px solid var(--cyan-400);
  background: linear-gradient(180deg, rgba(53, 208, 214, .07), rgba(14, 27, 42, 0) 62%);
  padding: 26px 22px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.page-about .about-role:nth-child(2) {
  border-top-color: var(--amber-400);
  background: linear-gradient(180deg, rgba(242, 178, 62, .08), rgba(14, 27, 42, 0) 62%);
}

.page-about .about-role-num {
  font-size: 40px;
  line-height: 1;
  color: var(--white-soft);
  letter-spacing: .04em;
}

.page-about .about-role:nth-child(2) .about-role-num {
  color: var(--amber-400);
}

.page-about .about-role-num::after {
  content: " 人";
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--slate-300);
}

.page-about .about-role h3 {
  margin: 0;
  font-size: 20px;
}

.page-about .about-role p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate-300);
}

.page-about .about-role-list {
  list-style: none;
  margin: auto 0 0;
  padding: 14px 0 0;
  border-top: var(--hair);
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate-300);
}

.page-about .about-role-list li {
  position: relative;
  padding-left: 16px;
}

.page-about .about-role-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--cyan-400);
}

.page-about .about-role:nth-child(2) .about-role-list li::before {
  background: var(--amber-400);
}

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

@media (min-width: 1120px) {
  .page-about .about-role-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 迭代时间线 */
.page-about .about-history-figure {
  margin: 32px 0 0;
}

.page-about .timeline-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 40px;
}

.page-about .about-years {
  display: none;
}

.page-about .about-events {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.page-about .about-event {
  position: relative;
  padding: 26px 0 26px 26px;
  border-left: 1px solid var(--ink-500);
  transition: background-color 160ms ease;
}

.page-about .about-event::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 34px;
  width: 7px;
  height: 7px;
  background: var(--cyan-400);
  box-shadow: 0 0 12px rgba(53, 208, 214, .75);
}

.page-about .about-event:hover {
  background: rgba(22, 41, 61, .55);
}

.page-about .about-event-year {
  display: block;
  font-size: 20px;
  letter-spacing: .08em;
  color: var(--cyan-400);
  margin-bottom: 8px;
}

.page-about .about-event h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.page-about .about-event p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-300);
}

.page-about .about-event--key::before {
  background: var(--amber-400);
  box-shadow: 0 0 16px rgba(242, 178, 62, .85);
}

.page-about .about-event--key .about-event-year {
  color: var(--amber-400);
}

.page-about .about-event-link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 208, 214, .45);
  padding-bottom: 2px;
}

.page-about .about-event-link:hover {
  color: var(--amber-200);
  border-bottom-color: var(--amber-400);
}

@media (min-width: 900px) {
  .page-about .timeline-layout {
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-years {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: sticky;
    top: 112px;
    align-self: start;
    padding: 6px 0 6px 18px;
    border-left: 1px solid var(--ink-500);
  }

  .page-about .about-year-tick {
    position: relative;
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: .08em;
    color: var(--slate-300);
  }

  .page-about .about-year-tick::before {
    content: "";
    position: absolute;
    left: -22px;
    top: 8px;
    width: 10px;
    height: 1px;
    background: var(--cyan-400);
    box-shadow: 0 0 8px rgba(53, 208, 214, .8);
  }

  .page-about .about-year-tick--key {
    color: var(--amber-400);
  }

  .page-about .about-year-tick--key::before {
    background: var(--amber-400);
    box-shadow: 0 0 10px rgba(242, 178, 62, .9);
  }

  .page-about .about-event {
    padding-left: 32px;
  }
}

/* 2024 版纸面插页 */
.page-about .about-paper {
  padding: 40px 24px;
}

.page-about .about-paper-eyebrow {
  color: var(--ember-500);
}

.page-about .about-paper h2 {
  margin: 12px 0 18px;
  color: var(--brown-900);
  max-width: 22ch;
}

.page-about .about-paper-lead {
  margin: 0;
  max-width: 68ch;
  color: var(--brown-900);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
}

.page-about .about-paper-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 32px;
  border: 1px solid rgba(27, 21, 18, .22);
}

.page-about .about-paper-col {
  padding: 24px 22px 26px;
  min-width: 0;
}

.page-about .about-paper-col h3 {
  margin: 12px 0 8px;
  font-size: 19px;
  color: var(--brown-900);
}

.page-about .about-paper-col p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(27, 21, 18, .78);
}

.page-about .about-paper-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  padding: 4px 8px;
  border: 1px solid rgba(27, 21, 18, .35);
  color: rgba(27, 21, 18, .8);
}

.page-about .about-paper-tag--key {
  background: var(--amber-400);
  border-color: var(--amber-400);
  color: var(--brown-900);
}

@media (min-width: 720px) {
  .page-about .about-paper {
    padding: 56px 48px 60px;
  }

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

  .page-about .about-paper-col + .about-paper-col {
    border-left: 1px solid rgba(27, 21, 18, .22);
  }

  .page-about .about-paper-col {
    padding: 28px 26px 30px;
  }
}

/* 轮次与说明对齐 */
.page-about .about-sync-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

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

.page-about .about-sync-copy h2 {
  margin: 12px 0 18px;
  max-width: 20ch;
}

.page-about .about-sync-copy > p {
  margin: 0;
  max-width: 60ch;
  color: var(--slate-300);
}

.page-about .about-sync-list {
  margin: 28px 0 0;
  padding: 0;
  border-top: var(--line);
}

.page-about .about-sync-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: var(--line);
}

.page-about .about-sync-item dt {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cyan-400);
}

.page-about .about-sync-item dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--white-soft);
}

@media (min-width: 960px) {
  .page-about .about-sync-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .about-sync-item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

/* 合作生态 */
.page-about .about-partner-grid {
  margin-top: 36px;
}

.page-about .about-partner-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px 22px 28px;
  min-width: 0;
}

.page-about .about-partner-card .panel-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-partner-card .panel-head h3 {
  margin: 0;
  font-size: 18px;
}

.page-about .about-partner-num {
  font-size: 34px;
  line-height: 1;
  color: var(--amber-400);
}

.page-about .about-partner-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-300);
}

/* 服务时段 */
.page-about .about-service-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  border: var(--line);
  border-left: 3px solid var(--amber-400);
  background: var(--ink-700);
  padding: 30px 24px 34px;
}

.page-about .about-service-copy h2 {
  margin: 12px 0 16px;
  font-size: 26px;
}

.page-about .about-service-copy p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate-300);
}

.page-about .about-service-note {
  margin-top: 14px !important;
  font-size: 14px;
  color: var(--white-soft);
}

.page-about .about-service-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

@media (min-width: 880px) {
  .page-about .about-service-band {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 48px;
    align-items: center;
    padding: 44px 44px 46px;
  }

  .page-about .about-service-actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-event,
  .page-about .about-role,
  .page-about .about-partner-card {
    transition: none;
  }
}