.page-about {
  --c-panel-hi: #1C3568;
  --ab-line: 1px solid var(--line-dark);
  background: var(--c-indigo);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(to right, rgba(167, 176, 192, 0.07) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(to bottom, rgba(167, 176, 192, 0.07) 0 1px, transparent 1px 72px);
  pointer-events: none;
}

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

.page-about .ab-hero__crumb {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .ab-hero__frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
  padding: clamp(1.25rem, 3.2vw, 2.5rem);
  border: var(--ab-line);
  background:
    linear-gradient(155deg, rgba(14, 124, 134, 0.22), rgba(11, 27, 58, 0) 58%),
    var(--c-indigo);
  position: relative;
}

.page-about .ab-hero__frame::after {
  content: "";
  position: absolute;
  right: -1px;
  top: 12%;
  width: 6px;
  height: 34%;
  background: var(--c-sunset);
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 0.9rem;
  font-size: 0.8125rem;
  letter-spacing: 0.2em;
  color: var(--c-lake-light);
}

.page-about .ab-hero__title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.35rem, 7.2vw, 5rem);
  line-height: 1.03;
  letter-spacing: -0.012em;
  color: var(--tx-dark-strong);
}

.page-about .ab-hero__title span {
  color: var(--c-lake-light);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 48ch;
  color: var(--tx-dark);
}

.page-about .ab-hero__marks {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 1.15rem 0 0;
  border-top: var(--ab-line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.75rem;
  font-size: 0.875rem;
  color: var(--tx-muted-dark);
}

.page-about .ab-hero__marks .mono {
  color: var(--c-sunset);
  font-weight: 600;
  margin-right: 0.4rem;
}

.page-about .ab-hero__media {
  margin: 0;
  border: var(--ab-line);
  background: var(--c-panel);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 7 / 4;
  object-fit: cover;
}

.page-about .ab-hero__media .media__caption {
  margin: 0;
  padding: 0.7rem 0.9rem 0.85rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--tx-muted-dark);
  border-top: var(--ab-line);
}

.page-about .ab-figs {
  list-style: none;
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark);
  border: var(--ab-line);
}

.page-about .ab-figs__item {
  background: var(--c-indigo);
  padding: 1.05rem 1.15rem 1.2rem;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-figs__item:hover {
  background: var(--c-panel);
}

.page-about .ab-figs__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.45rem, 3.4vw, 2rem);
  line-height: 1.1;
  color: var(--tx-dark-strong);
}

.page-about .ab-figs__label {
  margin: 0.45rem 0 0;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--tx-muted-dark);
}

/* ---------- 通用章节标题 ---------- */
.page-about .ab-head {
  max-width: 64ch;
  margin-bottom: clamp(1.75rem, 4.5vw, 3rem);
}

.page-about .ab-head__idx {
  margin: 0 0 0.8rem;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--c-lake);
}

.page-about .ab-head--light .ab-head__idx {
  color: var(--c-lake-light);
}

.page-about .ab-head__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.6vw, 2.9rem);
  line-height: 1.12;
  color: var(--tx-paper);
}

.page-about .ab-head--light .ab-head__title {
  color: var(--tx-dark-strong);
}

.page-about .ab-head__lede {
  margin: 0;
  max-width: 58ch;
  color: var(--tx-muted-paper);
  line-height: 1.85;
}

.page-about .ab-head--light .ab-head__lede {
  color: var(--tx-dark);
}

/* ---------- 发展历程 ---------- */
.page-about .ab-history {
  border-top: 3px solid var(--c-lake);
}

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.5rem;
  border-left: 1px solid var(--line-paper);
  display: grid;
  gap: 0.9rem;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: 1.4rem;
  width: 9px;
  height: 9px;
  background: var(--c-lake);
  transform: translateX(-50%) rotate(45deg);
  transition: background var(--dur) var(--ease);
}

.page-about .ab-tl__item:hover::before {
  background: var(--c-sunset);
}

.page-about .ab-tl__details {
  border: 1px solid var(--line-paper);
  background: rgba(255, 255, 255, 0.62);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .ab-tl__details:hover {
  border-color: var(--c-lake);
  background: #ffffff;
}

.page-about .ab-tl__summary {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.85rem 1.1rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-tl__summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--c-lake);
}

.page-about .ab-tl__details[open] .ab-tl__summary::after {
  content: "−";
}

.page-about .ab-tl__summary:focus-visible {
  outline: 2px solid var(--c-sunset);
  outline-offset: 2px;
}

.page-about .ab-tl__year {
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--c-sunset);
  flex: 0 0 auto;
  padding-top: 0.2rem;
}

.page-about .ab-tl__stage {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  color: var(--tx-paper);
  line-height: 1.4;
}

.page-about .ab-tl__body {
  padding: 0 1.1rem 1.1rem;
  border-top: 1px solid var(--line-paper);
  margin-top: 0.2rem;
  padding-top: 0.9rem;
}

.page-about .ab-tl__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--tx-muted-paper);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  align-items: start;
  row-gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: var(--ab-line);
}

.page-about .ab-crew__item {
  background: var(--c-panel);
  padding: 1.15rem 1.25rem 1.3rem;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-crew__item:hover {
  background: var(--c-panel-hi);
}

.page-about .ab-crew__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--tx-dark-strong);
  transition: color var(--dur) var(--ease);
}

.page-about .ab-crew__item:hover .ab-crew__name {
  color: var(--c-lake-light);
}

.page-about .ab-crew__desc {
  margin: 0.5rem 0 0;
  max-width: 54ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--tx-muted-dark);
}

.page-about .ab-crew__meta {
  margin: 0.75rem 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--c-lake-light);
}

.page-about .ab-team__media {
  margin: 0;
  border: var(--ab-line);
  background: var(--c-indigo);
}

.page-about .ab-team__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-team__media .media__caption {
  margin: 0;
  padding: 0.7rem 0.9rem 0.85rem;
  font-size: 0.8125rem;
  color: var(--tx-muted-dark);
  border-top: var(--ab-line);
}

/* ---------- 服务覆盖 ---------- */
.page-about .ab-reach__grid {
  align-items: start;
  row-gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.35rem;
}

.page-about .ab-scenes__item {
  padding-left: 1rem;
  border-left: 2px solid var(--c-lake-light);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-scenes__item:hover {
  border-color: var(--c-sunset);
  transform: translateX(3px);
}

.page-about .ab-scenes__who {
  margin: 0 0 0.3rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--tx-paper);
}

.page-about .ab-scenes__what {
  margin: 0;
  max-width: 56ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--tx-muted-paper);
}

.page-about .ab-reach__stats {
  display: grid;
  gap: 1px;
  background: var(--line-paper);
  border: 1px solid var(--line-paper);
}

.page-about .ab-reach__stat {
  background: var(--c-warm);
  padding: 1.2rem 1.25rem 1.35rem;
}

.page-about .ab-reach__big {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.8rem, 4.6vw, 2.6rem);
  line-height: 1.05;
  color: var(--c-lake);
}

.page-about .ab-reach__label {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
  color: var(--tx-muted-paper);
}

/* ---------- 资质与研究 ---------- */
.page-about .ab-cred {
  position: relative;
  overflow: hidden;
}

.page-about .ab-cred::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--c-lake) 0%, var(--c-lake-light) 45%, var(--c-sunset) 100%);
}

.page-about .ab-cred__grid {
  align-items: start;
  row-gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .ab-cred__media {
  margin: 0;
  border: var(--ab-line);
  background: var(--c-panel);
}

.page-about .ab-cred__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ab-cred__media .media__caption {
  margin: 0;
  padding: 0.7rem 0.9rem 0.85rem;
  font-size: 0.8125rem;
  color: var(--tx-muted-dark);
  border-top: var(--ab-line);
}

.page-about .ab-cred__body .ab-head {
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .ab-awards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: var(--ab-line);
}

.page-about .ab-awards__item {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
  background: var(--c-panel);
  padding: 1.15rem 1.25rem 1.3rem;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-awards__item:hover {
  background: var(--c-panel-hi);
}

.page-about .ab-awards__num {
  flex: 0 0 auto;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 600;
  line-height: 1;
  color: var(--c-sunset);
}

.page-about .ab-awards__name {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--tx-dark-strong);
}

.page-about .ab-awards__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--tx-muted-dark);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.25rem, 3vw, 2rem);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .ab-eco__item {
  border-top: 2px solid var(--c-wine);
  padding-top: 1rem;
}

.page-about .ab-eco__kind {
  margin: 0 0 0.55rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--c-wine);
}

.page-about .ab-eco__name {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--tx-paper);
}

.page-about .ab-eco__desc {
  margin: 0;
  max-width: 40ch;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--tx-muted-paper);
}

/* ---------- 维护记录 ---------- */
.page-about .ab-maint__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.page-about .ab-maint__lead .ab-head__title {
  margin-bottom: 1rem;
}

.page-about .ab-maint__lead .ab-head__lede {
  color: var(--tx-dark);
  max-width: 56ch;
}

.page-about .ab-maint__link {
  margin: 1.25rem 0 0;
  font-size: 0.92rem;
}

.page-about .ab-maint__link a {
  color: var(--c-lake-light);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease);
}

.page-about .ab-maint__link a:hover {
  color: var(--c-sunset-soft);
}

.page-about .ab-cycle {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: var(--ab-line);
}

.page-about .ab-cycle__item {
  background: var(--c-indigo);
  padding: 1.05rem 1.2rem 1.2rem;
  transition: background var(--dur) var(--ease);
}

.page-about .ab-cycle__item:hover {
  background: var(--c-panel);
}

.page-about .ab-cycle__freq {
  margin: 0 0 0.4rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--c-sunset);
}

.page-about .ab-cycle__what {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--tx-dark);
}

/* ---------- 结尾行动区 ---------- */
.page-about .ab-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3.5vw, 2.5rem);
  align-items: center;
}

.page-about .ab-cta__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.8vw, 2.3rem);
  line-height: 1.15;
  color: var(--tx-dark-strong);
}

.page-about .ab-cta__lede {
  margin: 0;
  max-width: 44ch;
  color: var(--tx-dark);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-eco__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-figs {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__frame {
    grid-template-columns: 1.06fr 0.94fr;
    align-items: center;
  }

  .page-about .ab-tl__body {
    padding-left: 1.6rem;
    padding-right: 1.6rem;
  }

  .page-about .ab-maint__inner {
    grid-template-columns: 1.15fr 0.85fr;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: 1fr auto;
  }

  .page-about .ab-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__title {
    letter-spacing: -0.018em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-figs__item,
  .page-about .ab-crew__item,
  .page-about .ab-scenes__item,
  .page-about .ab-awards__item,
  .page-about .ab-cycle__item,
  .page-about .ab-tl__details,
  .page-about .ab-tl__item::before {
    transition: none;
  }
  .page-about .ab-scenes__item:hover {
    transform: none;
  }
}
<<<END>>>