.page-about {
  --ab-radius: var(--r-m);
  background: var(--ink);
  color: var(--paper);
}

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

/* ============ Hero ============ */
.page-about .ab-hero {
  position: relative;
  padding: clamp(22px, 5vw, 56px) 0 clamp(26px, 4vw, 48px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% auto auto;
  width: min(560px, 70vw);
  height: min(560px, 70vw);
  background: radial-gradient(circle at 60% 40%, rgba(214, 168, 79, .16), transparent 62%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.page-about .ab-hero__title {
  margin: 12px 0 0;
  font-size: clamp(32px, 7.6vw, 76px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  max-width: 15em;
}

.page-about .ab-hero__lede {
  margin: 18px 0 0;
  max-width: 42em;
  color: var(--mist);
  font-size: clamp(15px, 1.9vw, 17px);
  line-height: 1.8;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero__panel {
  padding: clamp(16px, 2.6vw, 26px);
  border-radius: var(--r-l);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  backdrop-filter: blur(8px);
}

.page-about .ab-panel__label {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .ab-archive {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto 6px;
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  overflow: hidden;
}

.page-about .ab-stat {
  background: rgba(6, 19, 34, .78);
  padding: 12px 14px;
  display: grid;
  gap: 2px;
}

.page-about .ab-stat__value {
  font-size: clamp(24px, 4.6vw, 32px);
  line-height: 1;
  font-weight: 700;
  color: var(--gold-hi);
}

.page-about .ab-stat__label {
  font-size: 12.5px;
  color: var(--mist);
}

.page-about .ab-hero__note {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--mist);
}

/* ============ 章节头（大编号） ============ */
.page-about .ab-chapter {
  padding: clamp(38px, 6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 14px;
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .ab-chapter__head--stack {
  margin-bottom: 18px;
}

.page-about .ab-chapter__num {
  font-size: clamp(42px, 9vw, 92px);
  line-height: .82;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: rgba(214, 168, 79, .26);
  -webkit-text-stroke: 1px rgba(214, 168, 79, .55);
}

.page-about .ab-chapter__headtext .eyebrow {
  margin: 0 0 8px;
}

.page-about .ab-chapter__headtext .section-title {
  margin: 0;
  font-size: clamp(23px, 4.6vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

/* ============ 01 起点 ============ */
.page-about .ab-chapter__body {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .ab-prose p {
  margin: 0 0 14px;
  color: var(--mist);
  line-height: 1.85;
  font-size: clamp(15px, 1.8vw, 16.5px);
}

.page-about .ab-prose p:first-child {
  color: var(--paper);
}

.page-about .ab-side {
  padding: 18px 20px;
  border-radius: var(--ab-radius);
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .ab-side__title {
  margin: 0 0 12px;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .ab-side__list {
  margin: 0 0 16px;
  padding: 0;
}

.page-about .ab-side__row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

.page-about .ab-side__row:last-child {
  border-bottom: 0;
}

.page-about .ab-side__row dt {
  color: var(--mist);
}

.page-about .ab-side__row dd {
  margin: 0;
  color: var(--paper);
}

/* ============ 02 时间轴 ============ */
.page-about .ab-miles {
  padding: clamp(38px, 6vw, 76px) 0;
  background: linear-gradient(180deg, rgba(11, 31, 56, .85), rgba(6, 19, 34, .9));
  border-top: 1px solid var(--line);
}

.page-about .ab-miles__fig {
  margin: 0 0 clamp(22px, 3vw, 34px);
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--glass-line);
}

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

.page-about .media-frame__caption {
  padding: 10px 14px;
  font-size: 12.5px;
  color: var(--mist);
  background: rgba(6, 19, 34, .72);
  border-top: 1px solid var(--line);
}

.page-about .ab-tl-layout {
  display: grid;
  gap: 18px;
}

.page-about .ab-tl-index {
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: rgba(6, 19, 34, .7);
  padding: 12px 14px;
}

.page-about .ab-tl-index__label {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--gold);
}

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

.page-about .ab-tl-index__list a {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background .18s var(--ease);
}

.page-about .ab-tl-index__list a:hover,
.page-about .ab-tl-index__list a:focus-visible {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  border-left: 1px solid var(--line);
}

.page-about .ab-tl__item {
  position: relative;
  margin-bottom: 14px;
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(214, 168, 79, .14);
}

.page-about .tl-node {
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: rgba(6, 19, 34, .74);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .tl-node[open] {
  border-color: rgba(214, 168, 79, .55);
  box-shadow: inset 0 0 0 1px rgba(214, 168, 79, .18);
}

.page-about .tl-node > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding: 14px 16px;
  position: relative;
}

.page-about .tl-node > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-node > summary:focus-visible {
  outline: 2px solid var(--jade);
  outline-offset: 2px;
  border-radius: var(--ab-radius);
}

.page-about .tl-node__year {
  font-size: 15px;
  font-weight: 700;
  color: var(--coral);
  letter-spacing: .04em;
}

.page-about .tl-node__title {
  flex: 1 1 12em;
  min-width: 0;
  font-size: 15.5px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .tl-node__mark {
  position: relative;
  width: 16px;
  height: 16px;
  margin-left: auto;
  flex: none;
}

.page-about .tl-node__mark::before,
.page-about .tl-node__mark::after {
  content: "";
  position: absolute;
  background: var(--gold);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.page-about .tl-node__mark::before {
  left: 0;
  top: 7px;
  width: 16px;
  height: 2px;
}

.page-about .tl-node__mark::after {
  left: 7px;
  top: 0;
  width: 2px;
  height: 16px;
}

.page-about .tl-node[open] .tl-node__mark::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .tl-node__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
  margin-top: 2px;
  padding-top: 12px;
}

.page-about .tl-node__body p {
  margin: 0;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.8;
}

/* ============ 03 团队 ============ */
.page-about .ab-team__layout {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .ab-team__intro > p {
  margin: 0 0 18px;
  color: var(--mist);
  line-height: 1.85;
  font-size: clamp(15px, 1.8vw, 16.5px);
}

.page-about .ab-team__fig {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .ab-team__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-role {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: 0 var(--ab-radius) var(--ab-radius) 0;
  background: var(--ink-2);
  transition: transform .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-role:hover {
  transform: translateX(3px);
  border-color: rgba(214, 168, 79, .6);
  border-left-color: var(--gold-hi);
}

.page-about .ab-role__name {
  margin: 0 0 6px;
  font-size: 16px;
  color: var(--paper);
  letter-spacing: .02em;
}

.page-about .ab-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ============ 04 流程 ============ */
.page-about .ab-flow {
  padding: clamp(38px, 6vw, 76px) 0;
  background: var(--ink-2);
  border-top: 1px solid var(--line);
}

.page-about .ab-flow__lede {
  max-width: 44em;
  margin: -6px 0 clamp(20px, 3vw, 30px);
  color: var(--mist);
  line-height: 1.85;
  font-size: clamp(15px, 1.8vw, 16.5px);
}

.page-about .ab-steps {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-step {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: rgba(6, 19, 34, .76);
  transition: border-color .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease);
}

.page-about .ab-step:hover,
.page-about .ab-step:focus-visible {
  border-color: rgba(214, 168, 79, .7);
  box-shadow: inset 0 0 0 1px rgba(214, 168, 79, .2);
  background: rgba(18, 50, 83, .6);
  outline: none;
}

.page-about .ab-step__num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--coral);
  margin-bottom: 8px;
}

.page-about .ab-step__name {
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .ab-step__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
  transition: color .2s var(--ease);
}

.page-about .ab-step:hover .ab-step__note,
.page-about .ab-step:focus-visible .ab-step__note {
  color: var(--gold-hi);
}

.page-about .ab-flow__fig {
  margin: 0;
  border-radius: var(--r-l);
  overflow: hidden;
  border: 1px solid var(--line);
}

/* ============ 05 协作生态 ============ */
.page-about .ab-eco {
  padding: clamp(38px, 6vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-eco__grid {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .ab-eco__text p {
  margin: 0 0 14px;
  color: var(--mist);
  line-height: 1.85;
  font-size: clamp(15px, 1.8vw, 16.5px);
}

.page-about .ab-eco__panel {
  padding: clamp(16px, 2.6vw, 24px);
  border-radius: var(--r-l);
  border: 1px solid var(--glass-line);
  background: var(--glass);
  align-self: start;
}

.page-about .ab-eco__list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  overflow: hidden;
}

.page-about .ab-eco__list li {
  background: rgba(6, 19, 34, .82);
  padding: 11px 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
}

.page-about .ab-eco__k {
  font-size: 18px;
  font-weight: 700;
  color: var(--gold-hi);
  min-width: 3.6em;
}

.page-about .ab-eco__v {
  font-size: 13.5px;
  color: var(--mist);
  flex: 1 1 10em;
  min-width: 0;
}

/* ============ 06 承诺 ============ */
.page-about .ab-promise {
  padding: clamp(38px, 6vw, 76px) 0 clamp(28px, 4vw, 48px);
  background: linear-gradient(160deg, rgba(18, 50, 83, .55), rgba(6, 19, 34, .9) 62%);
  border-top: 1px solid var(--line);
}

.page-about .ab-promise__grid {
  display: grid;
  gap: 14px;
}

.page-about .ab-promise__item {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--jade);
  border-radius: 0 0 var(--ab-radius) var(--ab-radius);
  background: rgba(6, 19, 34, .68);
}

.page-about .ab-promise__name {
  margin: 0 0 10px;
  font-size: 18px;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .ab-promise__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .ab-promise__cta {
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--glass-line);
  border-radius: var(--r-l);
  background: var(--glass);
  display: grid;
  gap: 16px;
}

.page-about .ab-promise__ctatext {
  margin: 0;
  max-width: 40em;
  color: var(--paper);
  line-height: 1.8;
  font-size: clamp(15px, 1.8vw, 16.5px);
}

.page-about .ab-promise__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-topline {
  margin: clamp(22px, 3vw, 32px) 0 0;
  text-align: right;
}

.page-about .ab-toplink {
  color: var(--mist);
  font-size: 12.5px;
  letter-spacing: .08em;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-toplink:hover,
.page-about .ab-toplink:focus-visible {
  color: var(--gold-hi);
  border-bottom-color: var(--gold-hi);
}

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-promise__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, .82fr);
  }

  .page-about .ab-hero__panel {
    margin-top: 8px;
  }

  .page-about .ab-chapter__head {
    grid-template-columns: minmax(72px, 118px) minmax(0, 1fr);
    gap: 0 24px;
    align-items: center;
  }

  .page-about .ab-chapter__body {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, .8fr);
    align-items: start;
  }

  .page-about .ab-tl-layout {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .ab-tl-index {
    position: sticky;
    top: calc(var(--header-h) + 18px);
    align-self: start;
  }

  .page-about .ab-tl-index__list {
    flex-direction: column;
    gap: 6px;
  }

  .page-about .ab-tl-index__list a {
    display: block;
    text-align: center;
  }

  .page-about .ab-team__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .ab-eco__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(280px, .85fr);
    align-items: start;
  }

  .page-about .ab-promise__cta {
    margin-top: 40px;
  }
}
<<<PAGE_CSS_END>>>