.page-about {
  --ab-rule: rgba(29, 90, 69, 0.6);
  --ab-rule-soft: rgba(29, 90, 69, 0.32);
  background: var(--field);
  color: var(--chalk);
  overflow-x: hidden;
}

.page-about .ab-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.45);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(32px, 6vw, 64px) 0 clamp(28px, 4vw, 52px);
  border-bottom: 1px solid var(--ab-rule);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--ab-rule) 1px, transparent 1px),
    linear-gradient(to bottom, var(--ab-rule) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.3;
  -webkit-mask-image: radial-gradient(ellipse at 25% 15%, #000 0%, transparent 72%);
  mask-image: radial-gradient(ellipse at 25% 15%, #000 0%, transparent 72%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-stamp {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  padding: 5px 12px;
  border: 1px solid var(--cyan);
  border-radius: var(--radius-pill);
}

.page-about .ab-hero__no {
  display: block;
  font-family: var(--font-narrow);
  font-size: clamp(64px, 15vw, 140px);
  font-weight: 200;
  line-height: 0.8;
  letter-spacing: -0.02em;
  color: rgba(53, 242, 208, 0.1);
  -webkit-text-stroke: 1.5px var(--grid);
  transform: skewX(-4deg);
  margin: 10px 0 0;
}

.page-about .ab-hero__title {
  font-family: var(--font-narrow);
  font-size: clamp(28px, 5.4vw, 54px);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 8px 0 14px;
  color: var(--chalk);
}

.page-about .ab-hero__lead {
  max-width: 54ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--mist);
  margin: 0 0 20px;
}

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

.page-about .ab-meta__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--ab-rule);
  border-radius: var(--radius-pill);
  background: rgba(11, 59, 44, 0.55);
  font-size: 12px;
}

.page-about .ab-meta__k {
  color: var(--mist);
  letter-spacing: 0.06em;
}

.page-about .ab-meta__v {
  color: var(--chalk);
}

/* ---------- 图片框 ---------- */
.page-about .ab-frame {
  position: relative;
  margin: 0;
  border: 2px solid var(--grid);
  border-radius: var(--radius-panel);
  background: var(--turf);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .ab-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .ab-frame--wide img {
  aspect-ratio: 7 / 4;
}

.page-about .ab-frame--mist {
  margin-top: clamp(20px, 3vw, 30px);
  border-color: var(--ab-rule);
}

.page-about .ab-frame__cap {
  display: block;
  padding: 9px 14px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  border-top: 1px solid var(--ab-rule);
  background: rgba(3, 17, 13, 0.45);
}

.page-about .ab-hero__fig {
  align-self: end;
}

/* ---------- 主体骨架与粘性索引 ---------- */
.page-about .ab-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
  padding-block: clamp(28px, 5vw, 60px);
}

.page-about .ab-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--orange);
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.page-about .ab-index__link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 9px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--ab-rule-soft);
  border-radius: 6px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--chalk);
  border-color: var(--cyan);
  background: rgba(53, 242, 208, 0.08);
}

.page-about .ab-index__no {
  font-size: 10px;
  color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .ab-sec {
  scroll-margin-top: 110px;
  padding-top: clamp(24px, 4vw, 40px);
}

.page-about .ab-sec + .ab-sec {
  margin-top: clamp(24px, 4vw, 40px);
  border-top: 1px solid var(--ab-rule);
}

.page-about .ab-sec__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .ab-sec__no {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
  border: 1px solid var(--orange);
  border-radius: 4px;
  padding: 2px 6px;
}

.page-about .ab-sec__title {
  font-family: var(--font-narrow);
  font-size: clamp(21px, 3.2vw, 32px);
  font-weight: 400;
  line-height: 1.25;
  margin: 0;
  color: var(--chalk);
}

.page-about .ab-sub {
  font-family: var(--font-narrow);
  font-size: clamp(16px, 2.2vw, 21px);
  font-weight: 400;
  color: var(--cyan);
  margin: clamp(22px, 3vw, 30px) 0 10px;
  padding-left: 10px;
  border-left: 3px solid var(--orange);
}

.page-about .ab-p {
  max-width: 66ch;
  font-size: clamp(15px, 1.4vw, 16.5px);
  line-height: 1.85;
  color: var(--mist);
  margin: 0 0 14px;
}

/* ---------- 提示条 ---------- */
.page-about .ab-note {
  display: grid;
  gap: 8px;
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid var(--ab-rule);
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius-panel) var(--radius-panel) 0;
  background: rgba(11, 59, 44, 0.4);
}

.page-about .ab-note__tag {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .ab-note__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--chalk);
}

/* ---------- 刻度尺 ---------- */
.page-about .ab-ruler {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 22px 0 6px;
  border-top: 2px solid var(--grid);
  border-left: 1px solid var(--ab-rule-soft);
}

.page-about .ab-ruler__item {
  position: relative;
  padding: 14px 12px 12px;
  border-right: 1px solid var(--ab-rule-soft);
  border-bottom: 1px solid var(--ab-rule-soft);
}

.page-about .ab-ruler__item::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 12px;
  width: 2px;
  height: 10px;
  background: var(--cyan);
}

.page-about .ab-ruler__key {
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.04em;
}

.page-about .ab-ruler__val {
  display: block;
  margin-top: 4px;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  color: var(--chalk);
}

/* ---------- 流程 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  counter-reset: none;
}

.page-about .ab-steps__item {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 4px 10px;
  padding: 10px 12px;
  border: 1px solid var(--ab-rule-soft);
  border-radius: 10px;
  background: rgba(11, 59, 44, 0.3);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-steps__item:hover {
  border-color: var(--cyan);
  background: rgba(53, 242, 208, 0.06);
}

.page-about .ab-steps__idx {
  font-size: 11px;
  color: var(--orange);
}

.page-about .ab-steps__name {
  font-size: 14.5px;
  color: var(--chalk);
  font-weight: 500;
}

.page-about .ab-steps__desc {
  grid-column: 2;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 20px 0 24px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 20px 22px;
  border-left: 2px solid var(--ab-rule);
  transition: border-color var(--dur) var(--ease);
}

.page-about .ab-timeline__item:last-child {
  padding-bottom: 4px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  top: 4px;
  left: -7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--field);
  border: 2px solid var(--cyan);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-timeline__item:hover {
  border-left-color: var(--cyan);
}

.page-about .ab-timeline__item:hover::before {
  background: var(--cyan);
  border-color: var(--field);
}

.page-about .ab-timeline__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  margin: 0 0 6px;
}

.page-about .ab-timeline__ver {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--field);
  background: var(--cyan);
  border-radius: 4px;
  padding: 2px 7px;
}

.page-about .ab-timeline__year {
  font-size: 12px;
  color: var(--amber);
}

.page-about .ab-timeline__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--chalk);
  margin: 0 0 6px;
}

.page-about .ab-timeline__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.page-about .ab-team__row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 6px 12px;
  padding: 13px 12px;
  border: 1px solid var(--ab-rule-soft);
  border-radius: 10px;
  margin-bottom: 8px;
  background: rgba(11, 59, 44, 0.28);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-team__row:hover {
  border-color: var(--orange);
  background: rgba(255, 106, 42, 0.07);
}

.page-about .ab-team__name {
  font-size: 14.5px;
  color: var(--chalk);
}

.page-about .ab-team__num {
  font-size: 20px;
  color: var(--amber);
  line-height: 1;
}

.page-about .ab-team__unit {
  font-size: 11px;
  color: var(--mist);
  margin-left: 3px;
}

.page-about .ab-team__bar {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  border-radius: 999px;
  background: rgba(29, 90, 69, 0.55);
  overflow: hidden;
}

.page-about .ab-team__fill {
  display: block;
  height: 100%;
  width: var(--fill);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-about .ab-team__tag {
  grid-column: 1 / -1;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
  border-left: 2px solid var(--ab-rule);
  padding-left: 8px;
}

/* ---------- 协作网络 ---------- */
.page-about .ab-partners {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-partners__item {
  padding: 16px;
  border: 1px solid var(--ab-rule);
  border-radius: var(--radius-panel);
  background: linear-gradient(160deg, rgba(11, 59, 44, 0.7), rgba(6, 40, 31, 0.85));
  box-shadow: var(--shadow-soft);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.page-about .ab-partners__num {
  display: block;
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-partners__name {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--chalk);
}

.page-about .ab-partners__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 联系 ---------- */
.page-about .ab-contact {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}

.page-about .ab-contact__cell {
  display: grid;
  gap: 6px;
  justify-items: start;
  padding: 14px 16px;
  border: 1px solid var(--ab-rule);
  border-radius: var(--radius-panel);
  background: rgba(11, 59, 44, 0.45);
}

.page-about .ab-contact__label {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .ab-contact__value {
  font-size: 15px;
  color: var(--chalk);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-rule);
  word-break: break-all;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-contact__value:hover,
.page-about .ab-contact__value:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .ab-contact__copy {
  margin-top: 4px;
  font-size: 12px;
  padding: 6px 14px;
}

.page-about .ab-contact__hint {
  margin: 0;
  font-size: 12px;
  color: var(--mist);
}

/* ---------- 延伸 ---------- */
.page-about .ab-next {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(16px, 3vw, 26px);
  border: 2px solid var(--grid);
  border-radius: var(--radius-panel);
  background: rgba(3, 17, 13, 0.42);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-next__title {
  margin: 0 0 12px;
  font-family: var(--font-narrow);
  font-size: clamp(17px, 2.4vw, 22px);
  font-weight: 400;
  color: var(--chalk);
}

.page-about .ab-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .ab-next__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  font-size: 13.5px;
  color: var(--mist);
  text-decoration: none;
  border: 1px solid var(--ab-rule-soft);
  border-radius: 8px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  color: var(--chalk);
  border-color: var(--cyan);
  background: rgba(53, 242, 208, 0.08);
}

.page-about .ab-next__no {
  flex: none;
  font-size: 11px;
  color: var(--orange);
  border: 1px solid var(--orange);
  border-radius: 3px;
  padding: 1px 5px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: end;
  }

  .page-about .ab-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

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

  .page-about .ab-ruler {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    border-top: 2px solid var(--grid);
    padding-top: 0;
  }

  .page-about .ab-timeline__item {
    padding: 22px 16px 0 0;
    border-left: 0;
    border-right: 1px solid var(--ab-rule-soft);
  }

  .page-about .ab-timeline__item:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .ab-timeline__item::before {
    top: -7px;
    left: 0;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__copy {
    padding-bottom: 6px;
  }

  .page-about .ab-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-partners__item:hover {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --fill: currentColor;
}