.page-about {
  background-color: var(--c-navy);
  color: var(--c-paper);
  overflow-x: hidden;
}

.page-about :where(p) {
  line-height: 1.85;
}

/* ============ 首屏 ============ */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-gold-soft);
  background:
    radial-gradient(120% 92% at 6% 0%, rgba(26, 42, 63, .96) 0%, rgba(13, 23, 38, 1) 60%),
    var(--c-navy);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -12%;
  width: 64%;
  height: 170%;
  background: linear-gradient(152deg, rgba(200, 50, 43, .30) 0%, rgba(200, 50, 43, .05) 42%, rgba(201, 162, 74, .18) 100%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 34%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-vermilion) 0%, var(--c-gold) 62%, rgba(201, 162, 74, 0) 100%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 56px);
  align-items: end;
  padding-block: clamp(38px, 6.5vw, 84px) clamp(34px, 5.5vw, 74px);
}

@media (min-width: 880px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
}

.page-about .ab-hero__copy .breadcrumb {
  margin-bottom: 22px;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-5);
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--c-paper-2);
}

.page-about .ab-hero__lede {
  max-width: 48ch;
  margin: 22px 0 0;
  font-size: var(--step-1);
  color: var(--paper-82);
}

.page-about .ab-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

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

.page-about .ab-hero__figure .media-frame {
  box-shadow: 0 34px 74px rgba(7, 12, 18, .58);
}

@media (max-width: 879px) {
  .page-about .ab-hero__figure {
    max-width: 460px;
  }
}

/* ============ 主体分栏 ============ */
.page-about .ab-body {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(34px, 5.5vw, 68px) var(--gutter) clamp(48px, 7vw, 88px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(34px, 5vw, 60px);
}

@media (min-width: 1000px) {
  .page-about .ab-body {
    grid-template-columns: minmax(0, .54fr) minmax(0, 1fr);
    column-gap: clamp(42px, 6vw, 88px);
    align-items: start;
  }
}

/* ---- 左侧固定栏 ---- */
.page-about .ab-rail {
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .ab-rail {
    position: sticky;
    top: 108px;
  }
}

.page-about .ab-rail__stamp {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 18px 18px 18px 20px;
  border-left: 3px solid var(--c-vermilion);
  background: linear-gradient(90deg, rgba(200, 50, 43, .14) 0%, rgba(200, 50, 43, 0) 92%);
}

.page-about .ab-rail__brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-2);
  line-height: 1.2;
  color: var(--c-paper-2);
}

.page-about .ab-rail__note {
  margin: 20px 0 0;
  font-size: var(--step-0);
  color: var(--paper-72);
}

.page-about .ab-index {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .ab-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .2em;
  color: var(--c-gold);
}

.page-about .ab-index__list {
  counter-reset: abidx;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 11px;
  padding: 9px 8px 9px 0;
  border-bottom: 1px solid rgba(201, 162, 74, .10);
  color: var(--paper-72);
  text-decoration: none;
  font-size: var(--step-0);
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.page-about .ab-index__link::before {
  counter-increment: abidx;
  content: counter(abidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--c-gold);
  opacity: .8;
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--c-gold-2);
  transform: translateX(4px);
}

/* ---- 右侧连续画布 ---- */
.page-about .ab-flow {
  min-width: 0;
}

.page-about .ab-block {
  padding: clamp(30px, 4.4vw, 54px) 0;
  border-top: 1px solid var(--line-gold-soft);
  scroll-margin-top: 110px;
}

.page-about .ab-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .ab-block__no {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .18em;
  color: var(--c-gold);
}

.page-about .ab-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  line-height: 1.2;
  color: var(--c-paper-2);
}

:where(.page-about .ab-block p) {
  color: var(--paper-72);
}

.page-about .ab-block > p {
  max-width: 62ch;
  margin: 18px 0 0;
}

/* 数据面板 */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 2px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .ab-stat {
  padding: 20px 18px 20px 0;
  border-bottom: 1px solid var(--line-gold-soft);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-4);
  line-height: 1;
  color: var(--c-gold-2);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--paper-56);
}

/* 工序时间轴 */
.page-about .ab-steps {
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
  display: grid;
  gap: 28px;
}

.page-about .ab-steps::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-gold) 0%, rgba(201, 162, 74, .06) 100%);
}

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

.page-about .ab-step::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--c-navy);
  border: 2px solid var(--c-gold);
}

.page-about .ab-step__title {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: var(--step-1);
  color: var(--c-paper-2);
}

.page-about .ab-step__text {
  max-width: 58ch;
  margin: 7px 0 0;
}

/* 版本演进 */
.page-about .ab-ver__media {
  margin: 26px 0 0;
}

.page-about .ab-ver__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-ver__item {
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .ab-ver__item:last-child {
  border-bottom: 1px solid var(--line-gold-soft);
}

.page-about .ab-ver__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-ver__summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--c-gold);
  transition: transform .22s var(--ease);
}

.page-about .ab-ver__det[open] .ab-ver__summary::after {
  transform: rotate(45deg);
}

.page-about .ab-ver__badge {
  padding: 4px 9px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  white-space: nowrap;
  color: var(--c-gold-2);
}

.page-about .ab-ver__badge--now {
  background: var(--c-vermilion);
  border-color: var(--c-vermilion);
  color: var(--c-paper-2);
}

.page-about .ab-ver__name {
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--c-paper-2);
}

.page-about .ab-ver__text {
  max-width: 58ch;
  margin: 0;
  padding: 0 0 20px;
}

.page-about .ab-chips__lead {
  margin: 26px 0 0;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .06em;
  color: var(--c-gold);
}

.page-about .ab-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-chip {
  padding: 6px 11px;
  border: 1px solid var(--line-gold-soft);
  border-radius: 999px;
  background: rgba(201, 162, 74, .07);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--paper-82);
}

/* 多端差异 */
.page-about .ab-dev__media {
  margin: 26px 0 0;
}

.page-about .ab-dev__list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .ab-dev__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 15px 0;
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .ab-dev__item:last-child {
  border-bottom: 1px solid var(--line-gold-soft);
}

@media (min-width: 700px) {
  .page-about .ab-dev__item {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

.page-about .ab-dev__name {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .06em;
  color: var(--c-gold-2);
}

.page-about .ab-dev__desc {
  font-size: var(--step-0);
  color: var(--paper-72);
  line-height: 1.8;
}

/* 团队分组 */
.page-about .ab-groups {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
  margin: 28px 0 0;
}

@media (min-width: 760px) {
  .page-about .ab-groups {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
}

.page-about .ab-group {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(180deg, rgba(26, 42, 63, .72) 0%, rgba(13, 23, 38, .3) 100%);
  border-top: 2px solid var(--c-vermilion);
}

.page-about .ab-group:nth-child(2) {
  border-top-color: var(--c-gold);
}

.page-about .ab-group:nth-child(3) {
  border-top-color: var(--c-jade);
}

.page-about .ab-group__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--c-gold);
}

.page-about .ab-group__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-2);
  color: var(--c-paper-2);
}

.page-about .ab-group p {
  margin: 12px 0 0;
  font-size: var(--step-0);
}

/* 尾段 */
.page-about .ab-tail {
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .ab-cta {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4.2vw, 52px);
  border-radius: var(--radius-l);
  background: linear-gradient(136deg, var(--c-paper) 0%, var(--c-paper-2) 58%, #EEE0C4 100%);
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 132px;
  height: 5px;
  background: linear-gradient(90deg, var(--c-vermilion), var(--c-gold));
}

.page-about .ab-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-3);
  line-height: 1.2;
  color: var(--c-navy);
}

.page-about .ab-cta__text {
  max-width: 62ch;
  margin: 16px 0 0;
  color: rgba(13, 23, 38, .78);
}

.page-about .ab-cta__text a {
  color: var(--c-vermilion-2);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 50, 43, .4);
}

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

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-cta__contact {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid rgba(13, 23, 38, .14);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .04em;
  color: rgba(13, 23, 38, .68);
}

/* 窄屏收口 */
@media (max-width: 480px) {
  .page-about .ab-hero__title {
    font-size: clamp(30px, 8.6vw, 40px);
  }

  .page-about .ab-block__title {
    font-size: clamp(22px, 6.4vw, 28px);
  }

  .page-about .ab-stat__num {
    font-size: clamp(30px, 9vw, 42px);
  }

  .page-about .ab-index__link {
    font-size: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__link,
  .page-about .ab-ver__summary::after {
    transition: none;
  }

  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible {
    transform: none;
  }
}
<<<END>>>