.page-about {
  background: var(--paper);
  color: var(--text);
}

.page-about .ab-crumb {
  background: var(--ink);
  border-bottom: 2px solid var(--ink-2);
  padding: 11px 0;
}

.page-about .ab-crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.page-about .ab-crumb .breadcrumb__list li {
  list-style: none;
}

.page-about .ab-crumb .breadcrumb__link {
  color: var(--mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-crumb .breadcrumb__link:hover,
.page-about .ab-crumb .breadcrumb__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .ab-crumb .breadcrumb__sep {
  color: var(--ink-2);
}

.page-about .ab-crumb .breadcrumb__current {
  color: var(--orange);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(36px, 6vw, 84px) 0 clamp(34px, 5vw, 72px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  right: -10%;
  top: 12%;
  width: 56%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--orange));
  transform: rotate(-7deg);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--orange) 0 2px, transparent 2px 18px);
  pointer-events: none;
}

.page-about .ab-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .ab-hero__tag::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--orange);
}

.page-about .ab-hero__title {
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.2vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 15em;
}

.page-about .ab-hero__em {
  color: var(--orange);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  padding-top: clamp(18px, 2.6vw, 30px);
  border-top: 2px solid var(--ink-2);
}

.page-about .ab-hero__lede {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--paper);
  max-width: 36em;
}

.page-about .ab-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .ab-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 2px 0 2px 12px;
  border-left: 2px solid var(--orange);
}

.page-about .ab-hero__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__stat-label {
  font-size: 12px;
  line-height: 1.45;
  color: var(--mute);
}

/* ---------- 主栅格 ---------- */

.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  padding-top: clamp(32px, 5vw, 64px);
  padding-bottom: clamp(40px, 6vw, 88px);
}

.page-about .ab-index__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 16px;
}

.page-about .ab-index__list li {
  list-style: none;
}

.page-about .ab-index__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  text-decoration: none;
  color: var(--text);
  font-size: 13px;
  line-height: 1.4;
  border-bottom: 1px solid var(--paper-2);
  transition: color 0.18s ease;
}

.page-about .ab-index__list a:hover,
.page-about .ab-index__list a:focus-visible {
  color: var(--orange);
}

.page-about .ab-index__num {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .ab-stream {
  min-width: 0;
}

/* ---------- 章节骨架 ---------- */

.page-about .ab-sec {
  padding-bottom: clamp(40px, 6vw, 84px);
  scroll-margin-top: 96px;
}

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

.page-about .ab-sec__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .ab-sec__title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ab-sec__lede {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
  max-width: 40em;
}

/* ---------- 时间轴 ---------- */

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) clamp(20px, 3vw, 32px);
  border-left: 2px solid var(--paper-2);
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--orange);
  border: 2px solid var(--paper);
}

.page-about .ab-tl__year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tl__head {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  color: var(--text);
}

.page-about .ab-tl__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  max-width: 40em;
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  background: var(--ink-2);
  color: var(--paper);
  padding: clamp(22px, 3.6vw, 42px);
  border: var(--edge) solid var(--ink);
  box-shadow: var(--shadow-ink);
}

.page-about .ab-team .ab-sec__no {
  color: var(--lime);
}

.page-about .ab-team .ab-sec__title {
  color: var(--paper);
}

.page-about .ab-team .ab-sec__lede {
  color: var(--mute);
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 30px);
  align-items: start;
}

.page-about .ab-team__figure {
  margin: 0;
}

.page-about .ab-team__figure img,
.page-about .ab-flow__figure img,
.page-about .ab-ops__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .ab-bar {
  list-style: none;
  outline: none;
}

.page-about .ab-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
}

.page-about .ab-bar__name {
  font-size: 14px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-bar__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .ab-bar__track {
  position: relative;
  height: 14px;
  background: var(--ink);
  border: var(--edge) solid var(--ink);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  transition: filter 0.18s ease, width 0.6s ease;
}

.page-about .ab-bar__fill--orange {
  background: var(--orange);
}

.page-about .ab-bar__fill--lime {
  background: var(--lime);
}

.page-about .ab-bar__fill--paper {
  background: var(--paper-2);
}

.page-about .ab-bar__fill--mute {
  background: var(--mute);
}

.page-about .ab-bar__duty {
  margin: 7px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mute);
  transition: color 0.18s ease;
}

.page-about .ab-bar:hover .ab-bar__fill,
.page-about .ab-bar:focus-within .ab-bar__fill {
  filter: brightness(1.18);
}

.page-about .ab-bar:hover .ab-bar__duty,
.page-about .ab-bar:focus .ab-bar__duty,
.page-about .ab-bar:focus-within .ab-bar__duty {
  color: var(--paper);
}

/* ---------- 流程（收窄居中的窄栏） ---------- */

.page-about .ab-flow {
  max-width: 720px;
}

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

.page-about .ab-step {
  list-style: none;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px 16px;
  background: var(--paper-2);
  border: var(--edge) solid var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.page-about .ab-step:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}

.page-about .ab-step__no {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-about .ab-step__body {
  min-width: 0;
}

.page-about .ab-step__title {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  color: var(--text);
}

.page-about .ab-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .ab-step__more {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px dashed var(--mute);
}

.page-about .ab-step__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
}

.page-about .ab-step__more summary::-webkit-details-marker {
  display: none;
}

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

.page-about .ab-step__more[open] summary::before {
  content: "\2212";
}

.page-about .ab-step__out {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .ab-flow__figure {
  margin: 0 auto;
  max-width: 400px;
}

/* ---------- 数据伙伴 ---------- */

.page-about .ab-sources {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-source {
  background: var(--paper-2);
  border: var(--edge) solid var(--ink);
  padding: 18px;
  box-shadow: 4px 4px 0 var(--ink);
}

.page-about .ab-source__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-source__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
}

.page-about .ab-source__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 2025 调整 ---------- */

.page-about .ab-shift {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--edge) solid var(--ink);
}

.page-about .ab-shift__item {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--paper-2);
}

.page-about .ab-shift__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .ab-shift__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
  max-width: 42em;
}

/* ---------- 运营信息 ---------- */

.page-about .ab-ops {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(22px, 3.6vw, 44px);
  border: var(--edge) solid var(--ink-2);
}

.page-about .ab-ops .ab-sec__no {
  color: var(--lime);
}

.page-about .ab-ops .ab-sec__title {
  color: var(--paper);
}

.page-about .ab-ops .ab-sec__lede {
  color: var(--mute);
}

.page-about .ab-ops__figure {
  margin: 0 0 clamp(20px, 3vw, 28px);
}

.page-about .ab-ops__meta {
  margin: 0 0 clamp(18px, 3vw, 26px);
  display: grid;
  gap: 0;
}

.page-about .ab-ops__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3px;
  padding: 12px 0;
  border-bottom: 1px solid var(--ink-2);
}

.page-about .ab-ops__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mute);
}

.page-about .ab-ops__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-about .ab-ops__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .ab-ops__ghost {
  color: var(--paper);
  border-color: var(--paper);
}

.page-about .ab-ops__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mute);
  max-width: 40em;
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .ab-ops__row {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

@media (min-width: 760px) {
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    gap: clamp(20px, 3vw, 34px);
  }

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

  .page-about .ab-shift__item {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .ab-shell {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(24px, 3vw, 48px);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .ab-index__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .page-about .ab-index__list a {
    font-size: 13.5px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: clamp(24px, 4vw, 56px);
  }

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

@media (min-width: 1100px) {
  .page-about .ab-flow {
    margin-left: 0;
    margin-right: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bar__fill,
  .page-about .ab-step,
  .page-about .ab-index__list a,
  .page-about .ab-bar__duty {
    transition: none;
  }

  .page-about .ab-step:hover {
    transform: none;
    box-shadow: 4px 4px 0 var(--ink);
  }
}
<<<END>>>