.page-about {
  background: var(--paper);
  color: var(--ink-900);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .ab-block {
  padding: clamp(46px, 7vw, 96px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: clamp(22px, 4vw, 44px) 0 clamp(46px, 7vw, 92px);
  border-bottom: 1px solid var(--stone-300);
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  margin-top: clamp(24px, 5vw, 54px);
}

.page-about .ab-kicker {
  margin: 0 0 16px;
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--clay-500);
}

.page-about .ab-h1 {
  margin: 0 0 clamp(16px, 2.6vw, 26px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 7vw, 66px);
  line-height: 1.14;
  letter-spacing: .02em;
  max-width: 15em;
}

.page-about .ab-hero-main .lede {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15.5px, 1.9vw, 18.5px);
  line-height: 1.82;
  color: var(--ink-700);
}

.page-about .ab-hero-side {
  background: var(--ink-900);
  color: var(--paper);
  border-radius: var(--radius);
  padding: clamp(22px, 3vw, 32px);
  box-shadow: var(--shadow-soft);
}

.page-about .ab-side-title {
  margin: 0 0 18px;
  font-size: 10.5px;
  letter-spacing: .24em;
  color: var(--cyan-300);
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-fact {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 13px;
  border-bottom: 1px solid rgba(199, 210, 218, .16);
}

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

.page-about .ab-fact-num {
  flex: none;
  min-width: 2.6em;
  font-size: clamp(21px, 3vw, 29px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-500);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-fact-label {
  font-size: 13.5px;
  line-height: 1.55;
  color: rgba(247, 243, 234, .78);
}

/* ---------- 通用标题 ---------- */
.page-about .ab-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: .03em;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.22;
  color: var(--ink-900);
}

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

.page-about .ab-head {
  max-width: 46em;
  margin-bottom: clamp(28px, 4vw, 50px);
}

.page-about .ab-head-lede {
  margin: 14px 0 0;
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  line-height: 1.82;
  color: var(--ink-700);
}

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--stone-300);
  background: var(--stone-100);
}

.page-about .ab-figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--stone-300);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--moss-600);
}

/* ---------- 起点 ---------- */
.page-about .ab-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 62px);
}

.page-about .ab-origin-copy p {
  margin: 0 0 1.1em;
  max-width: 34em;
  font-size: clamp(14.8px, 1.6vw, 16.8px);
  line-height: 1.86;
  color: var(--ink-700);
}

.page-about .ab-pull {
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px);
  background: var(--stone-100);
  border-left: 3px solid var(--orange-500);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .ab-pull p {
  margin: 0 0 10px;
  max-width: none;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: .04em;
  font-size: clamp(18px, 2.4vw, 24px);
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .ab-pull-attr {
  display: block;
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--moss-600);
}

/* ---------- 时间线 ---------- */
.page-about .ab-era {
  background: var(--stone-100);
}

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

.page-about .ab-tl-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: clamp(22px, 3vw, 32px) 0;
  border-top: 1px solid var(--stone-300);
}

.page-about .ab-tl-era {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .ab-tl-year {
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tl-tag {
  padding: 2px 10px;
  border: 1px solid var(--orange-500);
  border-radius: 999px;
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--orange-500);
}

.page-about .ab-tl-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(16.5px, 2vw, 20.5px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink-900);
}

.page-about .ab-tl-body p {
  margin: 0 0 12px;
  max-width: 42em;
  font-size: clamp(14.2px, 1.55vw, 16px);
  line-height: 1.82;
  color: var(--ink-700);
}

.page-about .ab-tl-fold {
  margin-top: 4px;
  border-top: 1px dashed var(--stone-300);
}

.page-about .ab-tl-fold .fold-summary {
  padding: 10px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--clay-500);
}

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

.page-about .ab-tl-fold .fold-summary::after {
  content: " +";
  color: var(--cyan-500);
  font-weight: 700;
}

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

.page-about .ab-tl-fold .fold-body p {
  margin: 0 0 10px;
  max-width: 42em;
  font-size: 14.2px;
  line-height: 1.82;
  color: var(--ink-700);
}

.page-about .ab-era-figure {
  margin: clamp(30px, 4vw, 48px) 0 0;
}

/* ---------- 四环节 ---------- */
.page-about .ab-flow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 66px);
  align-items: center;
}

.page-about .ab-flow-figure {
  display: flex;
  justify-content: center;
}

.page-about .ab-ring {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
}

.page-about .ab-ring .ring-track {
  stroke: var(--stone-300);
}

.page-about .ab-ring .ring-progress {
  stroke: var(--cyan-500);
}

.page-about .ab-ring .ring-node {
  fill: var(--ink-900);
}

.page-about .ab-ring .ring-node--accent {
  fill: var(--orange-500);
}

.page-about .ab-ring .ring-center {
  fill: var(--ink-900);
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  letter-spacing: .02em;
}

.page-about .ab-ring .ring-center-sub {
  fill: var(--moss-600);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .26em;
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(16px, 2.2vw, 22px);
  border-bottom: 1px solid var(--stone-300);
}

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

.page-about .ab-step-num {
  padding-top: 2px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--orange-500);
}

.page-about .ab-step h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--ink-900);
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14.4px;
  line-height: 1.78;
  color: var(--ink-700);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .ab-team .ab-kicker {
  color: var(--cyan-300);
}

.page-about .ab-team .ab-head-lede {
  color: rgba(247, 243, 234, .78);
}

.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(13px, 2vw, 20px);
}

.page-about .ab-team-card {
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--ink-700);
  border: 1px solid rgba(199, 210, 218, .18);
  border-radius: var(--radius);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-team-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-500);
}

.page-about .ab-team-role {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 12px;
}

.page-about .ab-team-name {
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .ab-team-count {
  font-size: 20px;
  font-weight: 700;
  color: var(--orange-500);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-team-count small {
  margin-left: 3px;
  font-size: 10.5px;
  letter-spacing: .14em;
  color: rgba(247, 243, 234, .6);
}

.page-about .ab-team-card p {
  margin: 0;
  font-size: 14.2px;
  line-height: 1.78;
  color: rgba(247, 243, 234, .76);
}

/* ---------- 场景 ---------- */
.page-about .ab-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(15px, 2.4vw, 24px);
}

.page-about .ab-scene {
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--surface);
  border: 1px solid var(--stone-300);
  border-left: 3px solid var(--cyan-500);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-soft);
}

.page-about .ab-scene-num {
  margin: 0;
  font-size: 10.5px;
  letter-spacing: .2em;
  color: var(--clay-500);
}

.page-about .ab-scene h3 {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(15.5px, 1.9vw, 19px);
  font-weight: 700;
  letter-spacing: .03em;
  line-height: 1.35;
  color: var(--ink-900);
}

.page-about .ab-scene p {
  margin: 0;
  font-size: 14.4px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 服务与备案 ---------- */
.page-about .ab-scope {
  background: var(--deck);
  color: var(--paper);
}

.page-about .ab-scope-media {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-scope-media img {
  border-color: rgba(199, 210, 218, .2);
  opacity: .9;
}

.page-about .ab-scope .ab-kicker {
  color: var(--cyan-300);
}

.page-about .ab-scope-text {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  line-height: 1.82;
  color: rgba(247, 243, 234, .78);
}

.page-about .ab-scope-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 56px);
}

.page-about .ab-license {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 22px;
}

.page-about .ab-license span {
  padding: 5px 12px;
  border: 1px solid rgba(199, 210, 218, .26);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(247, 243, 234, .82);
}

.page-about .ab-contact {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-contact-row {
  display: grid;
  gap: 5px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(199, 210, 218, .16);
}

.page-about .ab-contact-row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .ab-contact dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--cyan-300);
}

.page-about .ab-contact dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .ab-scope-note {
  margin: 20px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(247, 243, 234, .72);
}

.page-about .ab-inline-link {
  color: var(--cyan-300);
  text-decoration: none;
  border-bottom: 1px solid rgba(126, 234, 242, .45);
  padding-bottom: 1px;
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 接下来的入口 ---------- */
.page-about .ab-next {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .ab-next-list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .ab-next-link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: clamp(14px, 2vw, 18px) clamp(14px, 2vw, 20px);
  background: var(--surface);
  border: 1px solid var(--stone-300);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink-900);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .ab-next-link:hover,
.page-about .ab-next-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan-500);
}

.page-about .ab-next-index {
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--orange-500);
}

.page-about .ab-next-text {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.page-about .ab-next-label {
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: .05em;
}

.page-about .ab-next-desc {
  font-size: 13px;
  line-height: 1.55;
  color: var(--moss-600);
}

.page-about .ab-next-arrow {
  font-size: 16px;
  color: var(--cyan-500);
}

/* ---------- 断点 ---------- */
@media (min-width: 760px) {
  .page-about .ab-next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-timeline {
    position: relative;
    margin-left: 4px;
    padding-left: clamp(20px, 3vw, 44px);
    border-left: 1px solid var(--stone-300);
  }

  .page-about .ab-tl-item {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 54px);
  }

  .page-about .ab-tl-era {
    flex-direction: column;
    align-items: flex-start;
    gap: 9px;
  }

  .page-about .ab-tl-item::before {
    content: "";
    position: absolute;
    left: calc(-1 * clamp(20px, 3vw, 44px) - 4.5px);
    top: calc(clamp(22px, 3vw, 32px) + 9px);
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--cyan-500);
    box-shadow: 0 0 0 4px var(--stone-100);
  }

  .page-about .ab-scenes {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .ab-scene:nth-child(1) {
    grid-column: 1 / span 5;
  }

  .page-about .ab-scene:nth-child(2) {
    grid-column: 6 / span 7;
    margin-top: clamp(0px, 3vw, 32px);
  }

  .page-about .ab-scene:nth-child(3) {
    grid-column: 2 / span 8;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .ab-origin-grid {
    grid-template-columns: minmax(0, 1.24fr) minmax(0, .86fr);
    align-items: start;
  }

  .page-about .ab-figure--origin {
    margin-top: clamp(38px, 6vw, 86px);
  }

  .page-about .ab-flow-grid {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  }

  .page-about .ab-team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .ab-team-card:nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-about .ab-team-card:nth-child(2) {
    grid-column: 8 / span 5;
  }

  .page-about .ab-team-card:nth-child(3) {
    grid-column: 2 / span 5;
  }

  .page-about .ab-team-card:nth-child(4) {
    grid-column: 7 / span 6;
  }

  .page-about .ab-scope-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team-card,
  .page-about .ab-next-link {
    transition: none;
  }

  .page-about .ab-team-card:hover,
  .page-about .ab-next-link:hover {
    transform: none;
  }
}
<<<END>>>