.page-about {
  --ab-pad: clamp(56px, 8vw, 108px);
  background: var(--ink);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(72px, 11vw, 132px) 0 clamp(44px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% -20%, rgba(95, 211, 255, 0.16), transparent 62%),
    radial-gradient(85% 65% at 4% 0%, rgba(244, 201, 93, 0.11), transparent 58%),
    var(--ink);
}
.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(34, 50, 83, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 50, 83, 0.5) 1px, transparent 1px);
  background-size: 74px 74px;
  -webkit-mask-image: radial-gradient(120% 90% at 70% 0%, #000 10%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 70% 0%, #000 10%, transparent 78%);
}
.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero__crumb {
  margin-bottom: clamp(28px, 5vw, 52px);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}
.page-about .ab-hero__crumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .ab-hero__crumb a:hover,
.page-about .ab-hero__crumb a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.page-about .ab-hero__crumb [aria-current="page"] {
  color: var(--white);
}
.page-about .ab-hero__kicker {
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold);
}
.page-about .ab-hero__title {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 16em;
  font-size: clamp(31px, 6vw, 66px);
  line-height: 1.12;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.page-about .ab-hero__title br {
  display: none;
}
.page-about .ab-hero__lead {
  max-width: 58ch;
  margin: 0;
  color: var(--mist);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
}
.page-about .ab-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.page-about .ab-hero__meta li {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}
.page-about .ab-hero__meta b {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0;
  color: var(--gold);
  margin-right: 4px;
}
.page-about .ab-hero__side {
  display: none;
}

/* ---------- 通用章节 ---------- */
.page-about .ab-sec {
  position: relative;
  padding: var(--ab-pad) 0;
}
.page-about .ab-sec--band {
  background: var(--ink-2);
  border-block: 1px solid var(--line);
}
.page-about .ab-sec__grid {
  display: grid;
  gap: 8px;
}
.page-about .ab-sec__num {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(44px, 9vw, 104px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(233, 238, 248, 0.1);
}
.page-about .ab-sec__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--gold);
}
.page-about .ab-sec__title {
  margin: 0 0 20px;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.28;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.page-about .ab-sec__head {
  margin-bottom: clamp(28px, 4vw, 46px);
}
.page-about .ab-sec__head .ab-sec__num {
  margin-bottom: 14px;
}
.page-about .ab-sec__intro {
  max-width: 60ch;
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
}
.page-about .prose {
  max-width: 64ch;
}
.page-about .prose p {
  margin: 0 0 16px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline__layout {
  display: grid;
  gap: 8px;
}
.page-about .ab-timeline__rail {
  display: none;
}
.page-about .ab-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}
.page-about .ab-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(to bottom, var(--line), var(--gold) 12%, var(--line) 88%);
}
.page-about .ab-node {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 46px) 4px;
  scroll-margin-top: calc(var(--bar-h) + 24px);
}
.page-about .ab-node:last-child {
  padding-bottom: 0;
}
.page-about .ab-node__dot {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .ab-node:hover .ab-node__dot {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(244, 201, 93, 0.14);
}
.page-about .ab-node__year {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--gold);
}
.page-about .ab-node__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.45;
  font-weight: 600;
}
.page-about .ab-node__text {
  margin: 0;
  max-width: 58ch;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}
.page-about .ab-roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  margin: clamp(24px, 3vw, 34px) 0;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-roles__item {
  padding: 16px 14px;
  background: var(--ink-2);
}
.page-about .ab-roles dt {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}
.page-about .ab-roles dd {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--mist);
}
.page-about .ab-roles dd span {
  font-size: 24px;
  color: var(--white);
  margin-right: 4px;
}
.page-about .ab-quote {
  position: relative;
  margin: 0;
  padding: 22px 22px 22px 26px;
  background: var(--paper);
  color: #1a1a20;
  border-left: 4px solid var(--orange);
  box-shadow: 10px 10px 0 rgba(34, 50, 83, 0.55);
}
.page-about .ab-quote p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
}
.page-about .ab-team__media {
  width: 100%;
}
.page-about .ab-team__media .media-frame__img {
  filter: grayscale(0.45) contrast(1.05);
  transition: filter 240ms var(--ease);
}
.page-about .ab-team__media:hover .media-frame__img {
  filter: none;
}

/* ---------- 内容生产 ---------- */
.page-about .ab-produce {
  position: relative;
  overflow: hidden;
  border-block: 1px solid var(--line);
}
.page-about .ab-produce__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  filter: saturate(0.75);
}
.page-about .ab-produce::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink) 0%, rgba(5, 7, 15, 0.72) 45%, var(--ink) 100%);
  pointer-events: none;
}
.page-about .ab-produce__inner {
  position: relative;
  z-index: 1;
}
.page-about .ab-flow {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border-block: 1px solid var(--line);
}
.page-about .ab-flow__item {
  padding: clamp(20px, 3vw, 28px) clamp(18px, 3vw, 26px);
  background: rgba(17, 28, 51, 0.86);
  border-left: 2px solid transparent;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-about .ab-flow__item:hover {
  border-left-color: var(--gold);
  background: rgba(17, 28, 51, 1);
}
.page-about .ab-flow__num {
  display: block;
  font-family: var(--mono);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--orange);
  margin-bottom: 8px;
}
.page-about .ab-flow__title {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.5;
  font-weight: 600;
}
.page-about .ab-flow__item p {
  margin: 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
}
.page-about .ab-produce__note {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  color: var(--mist);
  font-size: 14px;
  line-height: 1.8;
  max-width: 62ch;
}

/* ---------- 覆盖版图 ---------- */
.page-about .ab-map__banner {
  position: relative;
  margin: 0 0 clamp(30px, 4vw, 52px);
  overflow: hidden;
  border-bottom: 2px solid var(--gold);
}
.page-about .ab-map__banner .media-frame__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(28px, 4vw, 42px);
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--panel);
}
.page-about .ab-stats__num {
  font-family: var(--mono);
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  color: var(--gold);
}
.page-about .ab-stats__unit {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .ab-table {
  border-top: 1px solid var(--line);
}
.page-about .ab-table__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .ab-table__row span:nth-child(1) {
  font-size: 14px;
  font-weight: 600;
  color: var(--white);
}
.page-about .ab-table__row span:nth-child(2) {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .ab-table__row span:nth-child(3) {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--cyan);
}
.page-about .ab-table__row--head {
  display: none;
}

/* ---------- 合作与认可 ---------- */
.page-about .ab-partners__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}
.page-about .ab-partners__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  align-self: start;
}
.page-about .ab-partners__list li {
  padding: 20px 16px;
  background: var(--ink-2);
}
.page-about .ab-partners__num {
  display: block;
  font-family: var(--mono);
  font-size: 28px;
  line-height: 1;
  color: var(--white);
  margin-bottom: 8px;
}
.page-about .ab-partners__num em {
  font-style: normal;
  font-size: 18px;
  color: var(--gold);
}
.page-about .ab-partners__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

/* ---------- 工作方式 ---------- */
.page-about .ab-principles__list {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-principles__item {
  padding-left: 18px;
  border-left: 1px solid var(--line);
  transition: border-color var(--dur) var(--ease);
}
.page-about .ab-principles__item:hover {
  border-left-color: var(--orange);
}
.page-about .ab-principles__idx {
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--gold);
  margin-bottom: 10px;
}
.page-about .ab-principles__item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
}
.page-about .ab-principles__item p {
  margin: 0;
  max-width: 52ch;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.8;
}

/* ---------- 收束 ---------- */
.page-about .ab-outro {
  padding: clamp(72px, 11vw, 140px) 0 clamp(64px, 9vw, 120px);
  background: var(--ink);
  border-top: 1px solid var(--line);
}
.page-about .ab-outro__inner {
  max-width: 46rem;
}
.page-about .ab-outro__title {
  margin: 0 0 18px;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.page-about .ab-outro__lead {
  margin: 0 0 clamp(26px, 4vw, 38px);
  max-width: 56ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
}
.page-about .ab-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 媒体容器与描述 ---------- */
.page-about .media-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
}
.page-about .media-frame .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media-caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  line-height: 1.6;
}

/* ---------- ≥ 720px ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__title br {
    display: inline;
  }
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-partners__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .ab-table__row {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 2.4fr) minmax(0, 1.1fr);
    gap: 18px;
    align-items: baseline;
    padding: 15px 0;
  }
  .page-about .ab-table__row--head {
    display: grid;
  }
  .page-about .ab-table__row--head span {
    font-family: var(--mono);
    font-size: 11px !important;
    letter-spacing: 0.22em;
    color: var(--gold) !important;
    font-weight: 400 !important;
  }
}

/* ---------- ≥ 900px ---------- */
@media (min-width: 900px) {
  .page-about .ab-hero__side {
    display: block;
    position: absolute;
    right: clamp(14px, 3vw, 34px);
    top: clamp(140px, 16vw, 200px);
    z-index: 1;
    margin: 0;
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: 0.42em;
    color: rgba(154, 169, 196, 0.6);
  }
  .page-about .ab-sec__grid {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
  .page-about .ab-sec__label {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    margin: 0 0 18px 4px;
    align-self: start;
  }
  .page-about .ab-timeline__layout {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 48px;
  }
  .page-about .ab-timeline__rail {
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: sticky;
    top: calc(var(--bar-h) + 40px);
    align-self: start;
    padding-top: 4px;
  }
  .page-about .ab-year {
    font-family: var(--mono);
    font-size: 13px;
    letter-spacing: 0.12em;
    color: var(--mist);
    text-decoration: none;
    padding: 4px 0 4px 12px;
    border-left: 2px solid var(--line);
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }
  .page-about .ab-year:hover,
  .page-about .ab-year:focus-visible {
    color: var(--gold);
    border-left-color: var(--gold);
  }
  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
  .page-about .ab-team__media {
    margin-top: 36px;
  }
  .page-about .ab-produce .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }
  .page-about .ab-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- ≥ 1200px ---------- */
@media (min-width: 1200px) {
  .page-about .ab-sec__grid {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 56px;
  }
  .page-about .ab-timeline__layout {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 72px;
  }
  .page-about .ab-node__text {
    font-size: 15px;
  }
  .page-about .prose p {
    font-size: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team__media .media-frame__img,
  .page-about .ab-flow__item,
  .page-about .ab-node__dot,
  .page-about .ab-principles__item,
  .page-about .ab-year,
  .page-about .ab-hero__crumb a {
    transition: none;
  }
}
<<<END>>>