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

.page-about .breadcrumbs {
  padding-block: 18px 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 56px) 0 clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  top: -20%;
  right: -16%;
  width: min(680px, 74%);
  height: 140%;
  background: linear-gradient(160deg, var(--lime-a12), transparent 62%);
  clip-path: polygon(44% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

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

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(34px, 6.6vw, 74px);
  line-height: 1.08;
  letter-spacing: -0.01em;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--lime);
}

.page-about .ab-intro {
  max-width: 54ch;
  margin: 0 0 26px;
  font-size: clamp(15px, 1.7vw, 17.5px);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.page-about .ab-jump a {
  padding: 6px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

.page-about .ab-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.page-about .ab-index li {
  padding: 14px 14px 16px;
  background: var(--char);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

.page-about .ab-index li:nth-child(even) {
  margin-top: 16px;
}

.page-about .ab-index__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-index__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 区块骨架 ---------- */
.page-about .ab-block {
  padding: clamp(44px, 7vw, 86px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-block--char {
  background: var(--char);
}

.page-about .ab-block--end {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .ab-num {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .ab-head {
  max-width: 760px;
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .ab-title {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(24px, 3.6vw, 42px);
  line-height: 1.22;
  max-width: 24ch;
}

.page-about .ab-lead {
  margin: 0;
  font-size: clamp(14.5px, 1.7vw, 16.5px);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 起点 ---------- */
.page-about .ab-origin {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .ab-origin p {
  margin: 0 0 16px;
  font-size: clamp(14.5px, 1.7vw, 16.5px);
  line-height: 1.88;
  color: var(--silver);
}

.page-about .ab-facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-facts li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .ab-facts li::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 1px;
  background: var(--lime);
}

.page-about .ab-figure {
  position: relative;
  margin: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  border-radius: var(--r-md);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 流程 ---------- */
.page-about .ab-flow__ruler {
  position: relative;
  height: 16px;
  margin: 0 0 20px;
}

.page-about .ab-flow__ruler::before {
  content: "";
  position: absolute;
  top: 7px;
  left: 0;
  right: 20px;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--line-strong) 0 6px, transparent 6px 14px);
}

.page-about .ab-flow__ruler::after {
  content: "";
  position: absolute;
  top: 2px;
  right: 0;
  width: 0;
  height: 0;
  border-left: 13px solid var(--lime);
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
}

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

.page-about .ab-step {
  position: relative;
  padding: 18px 0 0;
}

.page-about .ab-step + .ab-step {
  margin-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .ab-step__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.page-about .ab-step h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

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

/* ---------- 两张表 ---------- */
.page-about .ab-tables {
  display: grid;
  gap: 18px;
}

.page-about .ab-table-card {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: var(--char);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
}

.page-about .ab-table-card--lime {
  border-top: 3px solid var(--lime);
}

.page-about .ab-table-card--amber {
  border-top: 3px solid var(--amber);
}

.page-about .ab-table-card .tag {
  display: inline-block;
  margin-bottom: 16px;
}

.page-about .ab-table-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(18px, 2.3vw, 23px);
  line-height: 1.4;
}

.page-about .ab-table-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .ab-fields {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .ab-fields li {
  padding: 5px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--silver);
}

.page-about .ab-tables__note {
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 16px 18px 16px 20px;
  border-left: 2px solid var(--lime);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--lime-a06);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .ab-tables__note a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

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

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-team__lead p {
  margin: 0 0 16px;
  font-size: clamp(14.5px, 1.7vw, 16.5px);
  line-height: 1.88;
  color: var(--silver);
}

.page-about .ab-figure--team {
  margin-top: 24px;
}

.page-about .ab-team__roles {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .ab-role {
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .ab-role summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  list-style: none;
  cursor: pointer;
  color: var(--paper);
}

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

.page-about .ab-role summary::after {
  content: "＋";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--lime);
}

.page-about .ab-role[open] summary::after {
  content: "－";
}

.page-about .ab-role__num {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-role__name {
  font-size: 15px;
  font-weight: 600;
}

.page-about .ab-role p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-team__collab {
  margin: 8px 0 0;
  padding-left: 14px;
  border-left: 1px solid var(--line-strong);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline-wrap {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--char);
}

.page-about .ab-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.15;
  pointer-events: none;
}

.page-about .ab-timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 680px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 30px;
  width: 2px;
  background: linear-gradient(180deg, var(--lime), var(--line-strong));
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 28px 34px;
}

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

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 9px;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--lime);
  box-shadow: 0 0 0 4px var(--lime-a12);
}

.page-about .ab-timeline__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 26px);
  letter-spacing: 0.04em;
  color: var(--lime);
}

.page-about .ab-timeline__body h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .ab-timeline__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--silver);
}

/* ---------- 更新与质量 ---------- */
.page-about .ab-rules {
  display: grid;
  border-top: 1px solid var(--line);
}

.page-about .ab-rules__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-rules__key {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--lime);
}

.page-about .ab-rules__val {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 结尾引导 ---------- */
.page-about .ab-next {
  display: grid;
  gap: 20px;
  padding: clamp(22px, 4vw, 36px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: linear-gradient(125deg, var(--slate), var(--char) 68%);
}

.page-about .ab-next__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 2.6vw, 28px);
  line-height: 1.35;
}

.page-about .ab-next__text {
  margin: 0;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }
}

@media (min-width: 820px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(16px, 2.4vw, 32px);
  }

  .page-about .ab-step {
    padding: 22px 0 0;
  }

  .page-about .ab-step + .ab-step {
    margin-top: 0;
    border-top: 0;
  }

  .page-about .ab-step::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 42px;
    height: 2px;
    background: var(--lime);
  }

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

@media (min-width: 900px) {
  .page-about .ab-head--split {
    max-width: none;
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: clamp(20px, 4vw, 48px);
    align-items: end;
  }

  .page-about .ab-tables {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .ab-table-card--shift {
    margin-top: 38px;
  }
}

@media (min-width: 920px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.78fr);
    align-items: end;
  }

  .page-about .ab-origin {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.94fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-jump a {
    transition: none;
  }
}
</final_solution>