.page-about {
  background: var(--ink);
  color: var(--mist-86);
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px;
  padding: clamp(96px, 13vw, 148px) 0 clamp(44px, 6vw, 76px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: auto 0 -30% 0;
  height: 60%;
  background: radial-gradient(ellipse at 78% 30%, rgba(255, 77, 46, 0.16), transparent 62%);
  pointer-events: none;
}

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

.page-about .ab-hero .breadcrumbs {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.5vw, 60px);
  align-items: end;
}

.page-about .ab-hero__copy h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.6vw, 64px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--mist);
  margin: 14px 0 0;
  max-width: 18ch;
}

.page-about .ab-hero__lead {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.78;
  color: var(--mist-72);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ab-stats {
  margin: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-stats__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-stats dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .ab-stats dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 24px);
  letter-spacing: -0.01em;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero__media {
  margin: clamp(28px, 4.5vw, 52px) 0 0;
  border: 1px solid var(--line-soft);
}

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

/* ---------- 主体两栏 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  padding-block: clamp(40px, 6vw, 88px);
}

/* 索引 */
.page-about .ab-index {
  min-width: 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 12px 0 14px;
}

.page-about .ab-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .ab-index__list {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-index__list a {
  display: block;
  white-space: nowrap;
  padding: 7px 12px;
  border: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--gray);
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease);
}

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

.page-about .ab-glossary {
  margin-top: 16px;
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
}

.page-about .ab-glossary summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  list-style: none;
}

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

.page-about .ab-glossary summary::before {
  content: "+ ";
  color: var(--cyan);
}

.page-about .ab-glossary[open] summary::before {
  content: "− ";
}

.page-about .ab-glossary summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .ab-glossary__list {
  margin: 12px 0 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-glossary__row dt {
  font-size: 13px;
  font-weight: 700;
  color: var(--mist);
  margin-bottom: 2px;
}

.page-about .ab-glossary__row dd {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--mist-72);
}

/* 正文流 */
.page-about .ab-stream {
  min-width: 0;
}

.page-about .ab-sec {
  padding-block: clamp(34px, 5vw, 58px);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-stream > .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--mist);
  margin: 12px 0 0;
  max-width: 24ch;
}

.page-about .ab-sec__lead {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-72);
}

/* ---------- 01 三层路径 ---------- */
.page-about .ab-layers {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-layer {
  position: relative;
  background: var(--ink);
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .ab-layer__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--home);
}

.page-about .ab-layer:nth-child(2) .ab-layer__no {
  color: var(--cyan);
}

.page-about .ab-layer:nth-child(3) .ab-layer__no {
  color: var(--away);
}

.page-about .ab-layer__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--mist);
  margin: 8px 0 0;
}

.page-about .ab-layer__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist-72);
}

.page-about .ab-layer__meta {
  margin: 14px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--gray);
}

/* ---------- 02 主客场 ---------- */
.page-about .ab-venue {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .ab-venue__side {
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(243, 246, 245, 0.03), transparent 62%);
}

.page-about .ab-venue__side--home {
  border-top: 2px solid var(--home);
}

.page-about .ab-venue__side--away {
  border-top: 2px solid var(--away);
}

.page-about .ab-venue__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--mist);
  margin: 14px 0 0;
}

.page-about .ab-venue__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .ab-venue__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist-72);
}

.page-about .ab-venue__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--home);
}

.page-about .ab-venue__side--away .ab-venue__list li::before {
  background: var(--away);
}

/* ---------- 03 多端续看 ---------- */
.page-about .ab-switch {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-switch__item {
  position: relative;
  padding-left: 20px;
  border-left: 1px solid var(--line-mid);
}

.page-about .ab-switch__item::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 6px;
  width: 5px;
  height: 5px;
  background: var(--cyan);
  border-radius: 50%;
}

.page-about .ab-switch__idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .ab-switch__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--mist);
  margin: 6px 0 0;
}

.page-about .ab-switch__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--mist-72);
}

.page-about .ab-version {
  margin-top: clamp(22px, 3vw, 32px);
  padding: 14px 18px;
  border: 1px solid var(--line-soft);
  background: rgba(49, 242, 214, 0.04);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
}

.page-about .ab-version__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-version__line {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist-72);
}

.page-about .ab-version__line b {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

/* ---------- 04 团队 ---------- */
.page-about .ab-team__media {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border: 1px solid var(--line-soft);
}

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

.page-about .ab-team {
  margin-top: 14px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-team__cell {
  position: relative;
  background: var(--ink);
  padding: clamp(18px, 2.4vw, 26px);
}

.page-about .ab-team__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.page-about .ab-team__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  color: var(--mist);
  margin: 8px 0 0;
}

.page-about .ab-team__text {
  margin: 9px 0 0;
  font-size: 13.5px;
  line-height: 1.76;
  color: var(--mist-72);
}

/* ---------- 05 历程 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0 0 0 22px;
  position: relative;
  display: grid;
  gap: 12px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--home), var(--away) 60%, var(--cyan));
  opacity: 0.6;
}

.page-about .ab-timeline__item {
  position: relative;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--home);
}

.page-about .ab-timeline__item:nth-child(even)::before {
  border-color: var(--away);
}

.page-about .ab-node {
  border: 1px solid var(--line-soft);
  background: rgba(243, 246, 245, 0.02);
}

.page-about .ab-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .ab-node__phase {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--home);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-node__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .ab-node__summary::after {
  content: "展开";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray);
}

.page-about .ab-node[open] .ab-node__summary::after {
  content: "收起";
  color: var(--cyan);
}

.page-about .ab-node__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-node__body p {
  margin: 12px 0 0;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--mist-72);
}

.page-about .ab-timeline__media {
  margin: clamp(22px, 3vw, 32px) 0 0;
  border: 1px solid var(--line-soft);
}

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

/* ---------- 06 合作与资质（雾白区） ---------- */
.page-about .ab-light {
  padding-inline: clamp(18px, 3vw, 34px);
  color: var(--pine);
}

.page-about .ab-light__title {
  color: var(--ink) !important;
}

.page-about .ab-light__lead {
  color: var(--pine) !important;
}

.page-about .ab-light .eyebrow {
  color: var(--home);
}

.page-about .ab-partners {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-partners__item {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .ab-partners__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0;
}

.page-about .ab-partners__text {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.76;
  color: var(--pine);
}

/* ---------- 07 服务范围 ---------- */
.page-about .ab-contact {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(135deg, rgba(255, 77, 46, 0.07), transparent 48%),
    linear-gradient(315deg, rgba(61, 139, 255, 0.08), transparent 52%),
    var(--pine);
}

.page-about .ab-contact__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-86);
}

.page-about .ab-contact__dl {
  margin: 20px 0 0;
  display: grid;
  gap: 0;
}

.page-about .ab-contact__row {
  display: grid;
  gap: 2px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-contact__row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .ab-contact__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}

.page-about .ab-contact__row dd a {
  text-decoration: none;
  border-bottom: 1px solid var(--line-mid);
  transition: border-color var(--speed) var(--ease), color var(--speed) var(--ease);
}

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

.page-about .ab-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-layers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-switch {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 24px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

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

  .page-about .ab-venue {
    grid-template-columns: 55fr 45fr;
    gap: 1px;
    background: var(--line-soft);
    border: 1px solid var(--line-soft);
  }

  .page-about .ab-venue__side {
    border: 0;
    border-top-width: 2px;
    border-top-style: solid;
  }

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

  .page-about .ab-contact {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-body {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .ab-index {
    position: sticky;
    top: 100px;
    border-top: 0;
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
    padding: 0 20px 0 0;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 0;
    padding: 0;
  }

  .page-about .ab-index__list a {
    white-space: normal;
    border: 0;
    border-left: 1px solid var(--line-soft);
    padding: 9px 0 9px 14px;
    font-size: 13px;
    line-height: 1.5;
  }

  .page-about .ab-index__list a:hover,
  .page-about .ab-index__list a:focus-visible {
    border-left-color: var(--home);
    color: var(--mist);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__list a,
  .page-about .ab-contact__row dd a {
    transition: none;
  }
}
<<<END>>>