.page-about {
  --ab-gap: clamp(1.25rem, 3vw, 2.25rem);
  --ab-beat: rgba(255, 90, 60, .16);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(1.5rem, 4vw, 2.75rem);
  padding-bottom: clamp(2.25rem, 5vw, 4rem);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: -18%;
  right: -24%;
  width: min(76vw, 720px);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 34% 32%, rgba(22, 198, 193, .20), transparent 62%),
    linear-gradient(142deg, rgba(255, 90, 60, .15), rgba(11, 16, 38, 0) 64%);
  clip-path: polygon(34% 0, 100% 0, 64% 100%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

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

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 7.2vw, 4.75rem);
  line-height: 1.04;
  letter-spacing: .005em;
  color: var(--paper);
  margin: .3em 0 .55em;
  max-width: 12em;
}

.page-about .ab-hero__lede {
  max-width: 46ch;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(2rem, 5vw, 3.25rem) 0 0;
  padding: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: .35rem;
  padding: 1rem 1.05rem 1.15rem;
  background: var(--panel-deep);
}

.page-about .ab-stat dt {
  font-size: var(--fs-12);
  letter-spacing: .04em;
  color: var(--muted);
  line-height: 1.45;
}

.page-about .ab-stat dd {
  font-family: var(--font-mono);
  font-size: var(--fs-25);
  font-weight: 600;
  color: var(--lake);
  margin: 0;
  line-height: 1.1;
}

/* ---------- 通用区块 ---------- */
.page-about .ab-section {
  padding-top: clamp(2.5rem, 6vw, 4.75rem);
  padding-bottom: clamp(2.5rem, 6vw, 4.75rem);
}

.page-about .ab-section + .ab-section {
  border-top: 1px solid var(--line);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.6rem, 4.4vw, 2.6rem);
  line-height: 1.14;
  color: var(--paper);
  margin: .35em 0 .5em;
  max-width: 20ch;
}

.page-about .section-sub {
  color: var(--muted);
  font-size: var(--fs-16);
  line-height: 1.75;
  max-width: 46ch;
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
}

.page-about .section-head .section-sub {
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

/* ---------- 图片容器 ---------- */
.page-about .ab-fig {
  margin: 0;
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}

.page-about .ab-fig figcaption {
  margin-top: .7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .ab-fig--lead {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

/* ---------- 品牌起点 ---------- */
.page-about .ab-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
}

.page-about .ab-note {
  border-left: 3px solid var(--lake-soft);
  padding: .35rem 0 .35rem 1.1rem;
  align-self: start;
}

.page-about .ab-note__label {
  font-size: var(--fs-12);
  letter-spacing: .1em;
  color: var(--lake);
  margin: 0 0 .7rem;
}

.page-about .ab-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .65rem;
}

.page-about .ab-note__list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 3px;
  background: var(--pulse);
  border-radius: 2px;
}

/* ---------- 方法 ---------- */
.page-about .ab-spark {
  display: block;
  width: 100%;
  height: auto;
  max-height: 150px;
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  opacity: .92;
}

.page-about .ab-layers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .ab-layer {
  background: var(--panel);
  padding: clamp(1.15rem, 3vw, 1.75rem);
}

.page-about .ab-layer__idx {
  font-size: var(--fs-12);
  letter-spacing: .16em;
  color: var(--lake-soft);
  margin: 0 0 .55rem;
}

.page-about .ab-layer__title {
  font-family: var(--font-display);
  font-size: var(--fs-25);
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 .6rem;
  letter-spacing: .01em;
}

.page-about .ab-layer__text {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .ab-method__foot {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  max-width: 52ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--paper);
  padding-left: 1.1rem;
  border-left: 2px solid var(--pulse);
}

/* ---------- 历程时间轴 ---------- */
.page-about .ab-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--lake), var(--line) 34%, var(--line));
}

.page-about .ab-track__item {
  position: relative;
  padding: 0 0 clamp(1.75rem, 4vw, 2.5rem) 2.1rem;
}

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

.page-about .ab-track__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--pulse);
  box-shadow: 0 0 0 4px var(--ab-beat);
  animation: ab-beat 2.8s var(--ease) infinite;
}

.page-about .ab-track__year {
  font-size: var(--fs-14);
  letter-spacing: .18em;
  color: var(--lake);
  margin: 0 0 .35rem;
}

.page-about .ab-track__title {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 .65rem;
  line-height: 1.3;
}

.page-about .ab-track__toggle {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .4rem .85rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--lake-soft);
  font-family: inherit;
  font-size: var(--fs-12);
  letter-spacing: .06em;
  cursor: pointer;
  transition: border-color .25s var(--ease), color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .ab-track__toggle:hover,
.page-about .ab-track__toggle:focus-visible {
  border-color: var(--lake);
  color: var(--paper);
  background: rgba(22, 198, 193, .1);
}

.page-about .ab-track__toggle .disclosure__sign {
  font-family: var(--font-mono);
  font-size: var(--fs-16);
  line-height: 1;
  color: var(--pulse);
}

.page-about .ab-track__panel {
  margin-top: .85rem;
  padding: .95rem 1.05rem;
  border: 1px solid var(--line);
  border-left: 2px solid var(--lake);
  border-radius: var(--radius-sm);
  background: var(--panel-deep);
}

.page-about .ab-track__panel p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-team__lead .prose {
  margin: 0 0 1rem;
}

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

.page-about .ab-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 1px;
  background: var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .ab-team__stats > div {
  background: var(--panel-deep);
  padding: .95rem 1rem 1.05rem;
}

.page-about .ab-team__stats dt {
  font-size: var(--fs-12);
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: .3rem;
}

.page-about .ab-team__stats dd {
  margin: 0;
  font-size: var(--fs-20);
  font-weight: 600;
  color: var(--pulse);
}

/* ---------- 更新与校验 ---------- */
.page-about .ab-review__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
}

.page-about .ab-review__card {
  padding: clamp(1.1rem, 2.6vw, 1.6rem);
}

.page-about .ab-review__card .card__title {
  font-family: var(--font-display);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 .6rem;
}

.page-about .ab-review__card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 生态与认可 ---------- */
.page-about .ab-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .ab-eco__block {
  background: var(--panel);
  padding: clamp(1.1rem, 2.8vw, 1.7rem);
}

.page-about .ab-eco__num {
  font-size: clamp(2.2rem, 6vw, 3.05rem);
  font-weight: 600;
  line-height: 1;
  margin: 0 0 .45rem;
  color: var(--lake);
  letter-spacing: -.01em;
}

.page-about .ab-eco__cap {
  margin: 0 0 .6rem;
  font-size: var(--fs-16);
  font-weight: 500;
  color: var(--paper);
  line-height: 1.5;
}

.page-about .ab-eco__desc {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-eco__foot {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  max-width: 52ch;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .ab-next__card {
  position: relative;
  display: block;
  padding: clamp(1.15rem, 3vw, 1.7rem);
  text-decoration: none;
  color: inherit;
  background: linear-gradient(150deg, var(--panel), var(--panel-deep));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  border-color: var(--lake);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.page-about .ab-next__idx {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--pulse);
  margin-bottom: .7rem;
}

.page-about .ab-next__title {
  font-family: var(--font-display);
  font-size: var(--fs-25);
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 .5rem;
}

.page-about .ab-next__text {
  margin: 0 0 1rem;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-next__arrow {
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  color: var(--lake);
  line-height: 1;
}

.page-about .ab-next__foot {
  margin: clamp(1.5rem, 3.5vw, 2rem) 0 0;
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.8;
}

.page-about .ab-next__foot a {
  color: var(--lake-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 242, 238, .35);
}

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

/* ---------- 动效 ---------- */
@keyframes ab-beat {
  0%, 100% { box-shadow: 0 0 0 4px var(--ab-beat); }
  50% { box-shadow: 0 0 0 10px rgba(255, 90, 60, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-track__dot { animation: none; }
  .page-about .ab-next__card { transition: none; }
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-layers { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .ab-eco__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .page-about .ab-next__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 720px) {
  .page-about .ab-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .ab-team__stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .page-about .ab-review__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .page-about .ab-cols { grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr); }
  .page-about .ab-team__grid { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: clamp(1.75rem, 4vw, 3rem); }
  .page-about .ab-next__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .ab-eco__grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
<<<END>>>