.page-about {
  --ab-line: rgba(198, 255, 61, 0.22);
  --ab-line-soft: rgba(198, 255, 61, 0.12);
  --ab-paper-line: rgba(36, 26, 20, 0.14);
  --ab-paper-ink: #241a14;
  --ab-paper-mute: rgba(36, 26, 20, 0.68);
  --ab-accent-warm: #9a5a22;
  --ab-cell: #fbf6ec;
  background: var(--cx-ink);
  color: var(--cx-text);
}

.page-about .ab-crumbbar {
  padding-top: clamp(16px, 3vw, 28px);
  padding-bottom: 4px;
}

/* ---------- 段落头 ---------- */
.page-about .ab-sec-head {
  max-width: 66ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .ab-sec-head__lede {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.78;
  color: var(--cx-text-dim);
}

.page-about .ab-sec-head--paper .ab-sec-head__lede {
  color: var(--ab-paper-mute);
}

.page-about .ab-sec-head--paper .cx-eyebrow {
  color: var(--ab-accent-warm);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 56px) 0 clamp(40px, 6vw, 84px);
  background:
    radial-gradient(120% 85% at 82% 0%, rgba(15, 42, 34, 0.95) 0%, rgba(10, 18, 16, 0) 62%),
    var(--cx-ink);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(198, 255, 61, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(198, 255, 61, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
  mask-image: linear-gradient(to bottom, #000 0%, transparent 88%);
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

.page-about .ab-hero__title {
  margin: 14px 0 18px;
  font-family: var(--cx-font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 68px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--cx-text);
}

.page-about .ab-hl {
  position: relative;
  display: inline-block;
  color: var(--cx-lime);
}

.page-about .ab-hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.06em;
  height: 3px;
  border-radius: 2px;
  background: var(--cx-lime);
}

.page-about .ab-hero__lede {
  max-width: 56ch;
  color: var(--cx-text-dim);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--cx-radius);
  overflow: hidden;
}

.page-about .ab-facts__item {
  background: var(--cx-char);
  padding: 14px 16px;
}

.page-about .ab-facts__item dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cx-mute);
}

.page-about .ab-facts__item dd {
  margin: 0;
  font-family: var(--cx-font-mono);
  font-weight: 700;
  font-size: clamp(19px, 3vw, 26px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--cx-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__fig {
  margin: 0;
  transform: rotate(-1.4deg);
}

.page-about .ab-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--cx-radius);
  border: 1px solid var(--ab-line);
}

.page-about .ab-hero__fig .cx-media__caption {
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cx-mute);
}

/* ---------- 版本演进时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 7vw, 88px) 0;
  background: linear-gradient(180deg, var(--cx-ink) 0%, var(--cx-green) 48%, var(--cx-ink) 100%);
}

.page-about .ab-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.16;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 28%, #000 72%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 28%, #000 72%, transparent);
}

.page-about .ab-timeline__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-timeline__inner {
  position: relative;
  z-index: 1;
}

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

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--cx-lime), rgba(198, 255, 61, 0.1));
}

.page-about .ab-tl__item {
  position: relative;
  padding-left: 58px;
  margin-bottom: 12px;
}

.page-about .ab-tl__item:last-child {
  margin-bottom: 0;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 19px;
  z-index: 1;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cx-ink);
  border: 2px solid var(--cx-lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 61, 0.1);
}

.page-about .ab-tl__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 14px 18px;
  list-style: none;
  cursor: pointer;
  background: var(--cx-char);
  border: 1px solid var(--cx-hair);
  border-radius: var(--cx-radius);
  transition: border-color 180ms var(--cx-ease), background 180ms var(--cx-ease);
}

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

.page-about .ab-tl__sum:hover {
  border-color: rgba(198, 255, 61, 0.4);
}

.page-about .ab-tl__sum:focus-visible {
  outline: 2px solid var(--cx-lime);
  outline-offset: 3px;
}

.page-about .ab-tl__sum::after {
  content: "+";
  margin-left: auto;
  font-family: var(--cx-font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cx-lime);
}

.page-about .ab-tl__node[open] .ab-tl__sum {
  border-color: rgba(198, 255, 61, 0.45);
  background: #16211c;
}

.page-about .ab-tl__node[open] .ab-tl__sum::after {
  content: "–";
}

.page-about .ab-tl__ver {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 3px;
  font-family: var(--cx-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cx-ink);
  background: var(--cx-lime);
}

.page-about .ab-tl__title {
  flex: 1 1 200px;
  font-family: var(--cx-font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 22px);
  letter-spacing: -0.01em;
  color: var(--cx-text);
}

.page-about .ab-tl__node[open] .ab-tl__title {
  color: var(--cx-lime-soft);
}

.page-about .ab-tl__body {
  margin: 8px 0 0;
  padding: 14px 18px 16px;
  border-left: 2px solid rgba(198, 255, 61, 0.28);
  background: rgba(20, 24, 22, 0.6);
  border-radius: 0 var(--cx-radius) var(--cx-radius) 0;
}

.page-about .ab-tl__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--cx-text-dim);
}

/* ---------- 奶油纸基础区 ---------- */
.page-about .ab-paper {
  background: var(--cx-paper);
  color: var(--ab-paper-ink);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .ab-paper .cx-h2 {
  color: var(--ab-paper-ink);
}

.page-about .ab-paper .cx-eyebrow {
  color: var(--ab-accent-warm);
}

.page-about .ab-paper .cx-media__caption {
  margin-top: 10px;
  font-size: 12px;
  color: rgba(36, 26, 20, 0.58);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  overflow: hidden;
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-team__fig {
  margin: 0;
  transform: rotate(1.2deg);
}

.page-about .ab-team__fig img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--cx-radius);
  border: 1px solid var(--ab-paper-line);
  background: var(--ab-cell);
}

.page-about .ab-tabs {
  display: flex;
  flex-wrap: wrap;
  column-gap: 8px;
  row-gap: 18px;
}

.page-about .ab-tabs > .cx-tabpanel {
  flex: 1 1 100%;
  min-width: 0;
}

.page-about .ab-tabs__tab {
  padding: 9px 15px;
  border: 1px solid rgba(36, 26, 20, 0.28);
  border-radius: 999px;
  background: transparent;
  color: var(--ab-paper-ink);
  font-family: var(--cx-font-body);
  font-size: 13px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 180ms var(--cx-ease), color 180ms var(--cx-ease), border-color 180ms var(--cx-ease);
}

.page-about .ab-tabs__tab:hover {
  border-color: var(--ab-paper-ink);
}

.page-about .ab-tabs__tab:focus-visible {
  outline: 2px solid var(--ab-accent-warm);
  outline-offset: 3px;
}

.page-about .ab-tabs__tab[aria-selected="true"] {
  background: var(--ab-paper-ink);
  border-color: var(--ab-paper-ink);
  color: var(--cx-paper);
}

.page-about .ab-tabs__panel {
  border-top: 2px solid var(--ab-paper-ink);
  padding-top: 18px;
}

.page-about .ab-tabs__panel:focus-visible {
  outline: 2px solid var(--ab-accent-warm);
  outline-offset: 4px;
}

.page-about .ab-tabs__title {
  margin: 0 0 8px;
  font-family: var(--cx-font-editorial);
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 600;
  color: var(--ab-paper-ink);
}

.page-about .ab-tabs__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ab-paper-mute);
  max-width: 58ch;
}

.page-about .ab-tabs__list {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tabs__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.68;
  color: rgba(36, 26, 20, 0.78);
}

.page-about .ab-tabs__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ab-accent-warm);
}

/* ---------- 校对流程 ---------- */
.page-about .ab-flow-sec {
  padding-top: 0;
}

.page-about .ab-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 24px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-flow__step {
  position: relative;
  padding: 24px 20px 24px;
  background: var(--ab-cell);
  border: 1px solid var(--ab-paper-line);
  border-radius: var(--cx-radius);
}

.page-about .ab-flow__step::before {
  content: "";
  position: absolute;
  left: -1px;
  right: -1px;
  top: -1px;
  height: 3px;
  border-radius: var(--cx-radius) var(--cx-radius) 0 0;
  background: linear-gradient(90deg, var(--ab-accent-warm), rgba(154, 90, 34, 0.12));
}

.page-about .ab-flow__no {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--cx-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ab-accent-warm);
}

.page-about .ab-flow__title {
  margin: 0 0 8px;
  font-family: var(--cx-font-display);
  font-size: clamp(18px, 2.2vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ab-paper-ink);
}

.page-about .ab-flow__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ab-paper-mute);
}

.page-about .ab-flow__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 16px 20px;
  border-left: 3px solid var(--ab-accent-warm);
  background: rgba(36, 26, 20, 0.06);
  border-radius: 0 var(--cx-radius) var(--cx-radius) 0;
  font-family: var(--cx-font-editorial);
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.75;
  color: var(--ab-paper-ink);
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-cover {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 7vw, 88px) 0;
  background:
    radial-gradient(95% 70% at 8% 0%, rgba(15, 42, 34, 0.95), rgba(10, 18, 16, 0) 66%),
    var(--cx-ink);
}

.page-about .ab-cover__accent {
  position: absolute;
  right: -90px;
  top: 90px;
  width: 280px;
  height: 280px;
  border-radius: 48px;
  background: rgba(198, 255, 61, 0.06);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-about .ab-cover > .cx-wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-cover__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 46px);
}

.page-about .ab-map {
  padding: 16px;
  background: rgba(20, 24, 22, 0.85);
  border: 1px solid var(--ab-line);
  border-radius: var(--cx-radius);
}

.page-about .ab-map__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-map__cap {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--cx-mute);
}

.page-about .ab-idx {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--cx-hair);
}

.page-about .ab-idx__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  column-gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--cx-hair);
}

.page-about .ab-idx__no {
  grid-row: 1 / span 2;
  padding-top: 4px;
  font-family: var(--cx-font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--cx-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-idx__link {
  justify-self: start;
  font-family: var(--cx-font-display);
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cx-text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--cx-ease), color 180ms var(--cx-ease);
}

.page-about .ab-idx__link:hover {
  color: var(--cx-lime-soft);
  border-bottom-color: var(--cx-lime);
}

.page-about .ab-idx__link:focus-visible {
  outline: 2px solid var(--cx-lime);
  outline-offset: 3px;
}

.page-about .ab-idx__desc {
  grid-column: 2;
  margin: 5px 0 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--cx-text-dim);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-eco__item {
  position: relative;
  overflow: hidden;
  padding: 20px;
  background: var(--ab-cell);
  border: 1px solid var(--ab-paper-line);
  border-radius: var(--cx-radius);
}

.page-about .ab-eco__item::after {
  content: "";
  position: absolute;
  right: -30px;
  bottom: -30px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: rgba(154, 90, 34, 0.09);
  pointer-events: none;
}

.page-about .ab-eco__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  border: 1px solid rgba(154, 90, 34, 0.42);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ab-accent-warm);
}

.page-about .ab-eco__title {
  margin: 0 0 8px;
  font-family: var(--cx-font-display);
  font-size: clamp(17px, 2.1vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ab-paper-ink);
}

.page-about .ab-eco__item p {
  position: relative;
  z-index: 1;
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ab-paper-mute);
}

.page-about .ab-eco__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 18px 22px;
  background: var(--ab-paper-ink);
  color: var(--cx-paper);
  border-radius: var(--cx-radius);
  font-family: var(--cx-font-editorial);
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.72;
}

/* ---------- 结果指标 ---------- */
.page-about .ab-metrics {
  padding: clamp(44px, 7vw, 88px) 0;
  background: var(--cx-green);
  color: var(--cx-text);
}

.page-about .ab-metrics__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(198, 255, 61, 0.16);
  border: 1px solid rgba(198, 255, 61, 0.16);
  border-radius: var(--cx-radius);
  overflow: hidden;
}

.page-about .ab-metrics__cell {
  display: flex;
  flex-direction: column;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--cx-green);
}

.page-about .ab-metrics__figure {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}

.page-about .ab-metrics__num {
  font-family: var(--cx-font-mono);
  font-size: clamp(23px, 3.6vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cx-lime);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-metrics__unit {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cx-mute);
}

.page-about .ab-metrics__cell p {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--cx-text-dim);
}

/* ---------- 结尾通道 ---------- */
.page-about .ab-cta {
  padding: clamp(40px, 6vw, 80px) 0;
  background: var(--cx-ink);
  border-top: 1px solid var(--cx-hair);
}

.page-about .ab-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: center;
}

.page-about .ab-cta__text p {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--cx-text-dim);
}

.page-about .ab-cta__inner .cx-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-eco__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .ab-cover__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

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

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 40px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-tl__item {
    padding-left: 68px;
  }

  .page-about .ab-tl::before {
    left: 25px;
  }

  .page-about .ab-tl__item::before {
    left: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-hero__fig,
  .page-about .ab-team__fig {
    transform: none;
  }

  .page-about .ab-tl__sum,
  .page-about .ab-tabs__tab,
  .page-about .ab-idx__link {
    transition: none;
  }
}