.page-about {
  --ab-max: 1200px;
  --ab-gutter: 20px;
  --ab-muted: #5a5147;
  --ab-ink-body: rgba(243, 235, 221, 0.78);
  --ab-ink-soft: rgba(243, 235, 221, 0.55);
  background: var(--paper-100);
  color: var(--brown-900);
  font-family: var(--font-sans);
  overflow-x: clip;
  padding-block-start: 12px;
}

.page-about .ab-shell {
  width: 100%;
  max-width: var(--ab-max);
  margin-inline: auto;
  padding-inline: var(--ab-gutter);
}

.page-about .ab-crumbs {
  padding-block: 22px 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ab-muted);
}

.page-about .ab-crumbs a {
  color: var(--ab-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-crumbs a:hover {
  color: var(--teal-700);
  border-bottom-color: var(--teal-700);
}

/* ---------- 首屏声明 ---------- */
.page-about .ab-hero {
  display: grid;
  gap: 24px;
  padding-block: 34px 54px;
  border-bottom: 1px solid var(--line-ink);
}

.page-about .ab-hero__kicker {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--orange-500);
}

.page-about .ab-hero__kicker::before {
  content: "";
  flex: none;
  width: 34px;
  height: 2px;
  background: var(--orange-500);
}

.page-about .ab-hero__title {
  margin: 0;
  max-width: 18ch;
  font-size: clamp(30px, 8.2vw, 62px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.025em;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ab-muted);
}

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

.page-about .ab-hero__facts li {
  background: var(--paper-100);
  padding: 16px 14px;
  display: grid;
  gap: 5px;
  align-content: start;
}

.page-about .ab-hero__facts b {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brown-900);
}

.page-about .ab-hero__facts span {
  font-size: 12px;
  line-height: 1.5;
  color: var(--ab-muted);
  letter-spacing: 0.02em;
}

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

/* ---------- 分区标题 ---------- */
.page-about .ab-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-block: 14px 0;
  border-top: 1px solid var(--line-ink);
  margin-bottom: 22px;
}

.page-about .ab-head__index {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange-500);
}

.page-about .ab-head__title {
  margin: 0;
  font-size: clamp(21px, 4.6vw, 33px);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-head--ink {
  border-top-color: var(--line-mid);
}

.page-about .ab-head--ink .ab-head__title {
  color: var(--paper-100);
}

.page-about .ab-lede {
  margin: 0 0 26px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-muted);
}

.page-about .ab-ink .ab-lede {
  color: var(--ab-ink-body);
}

/* ---------- 01 缘起 ---------- */
.page-about .ab-origin {
  display: grid;
  gap: 32px;
  padding-block: 52px 0;
}

.page-about .ab-prose p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--ab-muted);
}

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

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-ink);
}

.page-about .ab-figure figcaption {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line-ink);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--ab-muted);
}

/* ---------- 02 团队 ---------- */
.page-about .ab-team {
  padding-block: 56px 0;
}

.page-about .ab-team__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-tabs__list {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-ink);
  scrollbar-width: thin;
}

.page-about .ab-tabs__btn {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ab-muted);
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .ab-tabs__btn:hover {
  color: var(--brown-900);
  background: rgba(255, 107, 44, 0.07);
}

.page-about .ab-tabs__btn[aria-selected="true"] {
  color: var(--brown-900);
  border-bottom-color: var(--orange-500);
}

.page-about .ab-tabs__btn:focus-visible {
  outline: 2px solid var(--teal-700);
  outline-offset: -2px;
}

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

.page-about .ab-tabs__panel[hidden] {
  display: none;
}

.page-about .ab-tabs__panel p {
  margin: 0 0 16px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-muted);
}

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

.page-about .ab-list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding-block: 11px;
  border-top: 1px solid var(--line-ink);
  font-size: 14px;
  line-height: 1.7;
  color: var(--brown-900);
}

.page-about .ab-list li:last-child {
  border-bottom: 1px solid var(--line-ink);
}

.page-about .ab-list__n {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange-500);
  padding-top: 4px;
}

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

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-ink);
}

.page-about .ab-team__figure figcaption {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line-ink);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--ab-muted);
}

/* ---------- 深色区通用 ---------- */
.page-about .ab-ink {
  background: var(--ink-900);
  color: var(--paper-100);
  padding-block: 56px;
  border-block: 1px solid var(--line-mid);
}

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

/* ---------- 03 校对流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-mid);
  border: 1px solid var(--line-mid);
}

.page-about .ab-steps li {
  background: var(--ink-800);
  padding: 22px 18px 20px;
  display: grid;
  gap: 8px;
  align-content: start;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-steps li:hover {
  background: var(--teal-700);
}

.page-about .ab-steps__n {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime-400);
}

.page-about .ab-steps h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--paper-100);
}

.page-about .ab-steps p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ab-ink-body);
}

.page-about .ab-pulse {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--line-mid);
  display: grid;
  gap: 12px;
}

.page-about .ab-pulse__num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 6.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime-400);
}

.page-about .ab-pulse p {
  margin: 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ab-ink-body);
}

/* ---------- 04 历程 ---------- */
.page-about .ab-milestones {
  padding-block: 0 56px;
}

.page-about .ab-banner {
  margin-bottom: 38px;
  overflow: hidden;
  border-bottom: 1px solid var(--line-mid);
}

.page-about .ab-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.06);
}

.page-about .ab-years {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  border-top: 1px solid var(--line-mid);
  padding-bottom: 18px;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan-400) transparent;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-years:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 6px;
}

.page-about .ab-years__item {
  flex: 0 0 78%;
  max-width: 300px;
  scroll-snap-align: start;
  border-right: 1px solid var(--line-mid);
  padding: 22px 22px 12px 0;
}

.page-about .ab-years__item:last-child {
  border-right: 0;
}

.page-about .ab-years__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan-400);
}

.page-about .ab-years__tag {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 8px;
  border: 1px solid rgba(182, 255, 59, 0.45);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime-400);
}

.page-about .ab-years__item p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ab-ink-body);
}

/* ---------- 05 协作生态 ---------- */
.page-about .ab-eco {
  padding-block: 58px 0;
}

.page-about .ab-eco__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-eco__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ab-muted);
  max-width: 56ch;
}

.page-about .ab-eco__legend {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-ink);
}

.page-about .ab-eco__legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding-block: 12px;
  border-bottom: 1px solid var(--line-ink);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--brown-900);
}

.page-about .ab-eco__legend b {
  font-weight: 800;
}

.page-about .ab-eco__dot {
  width: 10px;
  height: 10px;
  margin-top: 6px;
  display: block;
  border: 1px solid var(--brown-900);
}

.page-about .ab-eco__dot--a {
  background: var(--cyan-400);
}

.page-about .ab-eco__dot--b {
  background: var(--orange-500);
}

.page-about .ab-eco__dot--c {
  background: var(--lime-400);
}

.page-about .ab-eco__figure {
  border: 1px solid var(--line-ink);
  background: var(--paper-100);
  padding: 10px;
}

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

.page-about .ab-net__gridline {
  fill: none;
  stroke: var(--line-mid);
  stroke-width: 1;
}

.page-about .ab-net__link {
  fill: none;
  stroke: var(--cyan-400);
  stroke-width: 1;
  stroke-dasharray: 3 4;
  opacity: 0.55;
}

.page-about .ab-net__node circle {
  fill: var(--ink-800);
  stroke: var(--cyan-400);
  stroke-width: 1.5;
  transition: fill var(--dur) var(--ease), stroke var(--dur) var(--ease),
    stroke-width var(--dur) var(--ease);
}

.page-about .ab-net__node:hover circle,
.page-about .ab-net__node:focus circle {
  fill: var(--teal-700);
  stroke: var(--lime-400);
  stroke-width: 2.5;
}

.page-about .ab-net__node:focus {
  outline: none;
}

.page-about .ab-net__label {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  fill: var(--paper-100);
  text-anchor: middle;
}

.page-about .ab-net__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--steel-500);
  text-anchor: middle;
}

.page-about .ab-net__hub circle {
  fill: var(--orange-500);
  stroke: var(--orange-500);
}

.page-about .ab-net__hub:hover circle,
.page-about .ab-net__hub:focus circle {
  fill: var(--orange-500);
  stroke: var(--brown-900);
}

.page-about .ab-net__hub .ab-net__label {
  fill: var(--ink-900);
  font-size: 12px;
}

/* ---------- 06 覆盖与荣誉 ---------- */
.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-mid);
  border: 1px solid var(--line-mid);
}

.page-about .ab-stats li {
  background: var(--ink-900);
  padding: 26px 20px 24px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .ab-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 7vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--lime-400);
}

.page-about .ab-stats__unit {
  font-size: 0.38em;
  font-weight: 500;
  margin-left: 5px;
  color: var(--paper-100);
  letter-spacing: 0;
}

.page-about .ab-stats__label {
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--ab-ink-body);
}

.page-about .ab-award {
  margin-top: 22px;
  padding: 22px;
  display: grid;
  gap: 14px;
  border: 1px solid rgba(182, 255, 59, 0.35);
  background: rgba(182, 255, 59, 0.06);
}

.page-about .ab-award p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--paper-100);
}

/* ---------- 07 价值观与收束 ---------- */
.page-about .ab-values {
  padding-block: 62px 74px;
}

.page-about .ab-values__grid {
  display: grid;
  border-top: 1px solid var(--line-ink);
}

.page-about .ab-values__grid article {
  padding: 24px 0;
  border-bottom: 1px solid var(--line-ink);
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .ab-values__k {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--brown-900);
}

.page-about .ab-values__k::before {
  content: "";
  flex: none;
  width: 16px;
  height: 2px;
  background: var(--orange-500);
}

.page-about .ab-values__grid article p {
  margin: 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ab-muted);
}

.page-about .ab-close {
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid var(--line-ink);
  display: grid;
  gap: 18px;
}

.page-about .ab-close p {
  margin: 0;
  font-size: clamp(18px, 3.4vw, 25px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about {
    --ab-gutter: 34px;
  }

  .page-about .ab-hero {
    padding-block: 46px 66px;
    gap: 28px;
  }

  .page-about .ab-pulse {
    grid-template-columns: 190px minmax(0, 1fr);
    align-items: center;
    gap: 28px;
  }

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

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

  .page-about .ab-years__item {
    flex: 0 0 250px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-origin {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 58px;
    align-items: start;
    padding-block: 64px 0;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 310px);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    gap: 54px;
    align-items: start;
  }

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

  .page-about .ab-values__grid article {
    padding: 30px 26px 30px 0;
    border-bottom: 0;
    border-right: 1px solid var(--line-ink);
  }

  .page-about .ab-values__grid article:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .ab-close {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tabs__btn,
  .page-about .ab-steps li,
  .page-about .ab-net__node circle,
  .page-about .ab-crumbs a {
    transition: none;
  }
}