.page-about {
  --ab-side: 208px;
  background: var(--night-900);
  color: var(--ice);
  font-family: var(--font-body);
}

/* ---------- 页头 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(28px, 5vw, 56px) clamp(36px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(168deg, var(--night-800) 0%, var(--night-900) 56%, #06101d 100%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  top: -40%;
  width: 58%;
  height: 180%;
  border-left: 1px solid rgba(61, 245, 192, 0.16);
  transform: skewX(-14deg);
  pointer-events: none;
  z-index: -1;
}

.page-about .ab-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  overflow: hidden;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.78);
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(90% 70% at 78% 6%, rgba(61, 245, 192, 0.16), transparent 62%),
    linear-gradient(180deg, rgba(5, 11, 22, 0.42) 0%, rgba(5, 11, 22, 0.86) 60%, var(--night-900) 100%);
}

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

.page-about .ab-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 9.2vw, 96px);
  line-height: 0.96;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.page-about .ab-hero__title span {
  color: var(--cyan);
}

.page-about .ab-hero__lede {
  max-width: 34em;
  margin-top: 20px;
  font-size: clamp(15px, 2.4vw, 18px);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-hero__stat {
  background: rgba(10, 21, 38, 0.86);
  padding: 14px 16px 16px;
}

.page-about .ab-hero__stat-label {
  order: 2;
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .ab-hero__stat-value {
  margin: 0;
  font-size: clamp(24px, 5.4vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

/* ---------- 两栏骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: 28px;
  padding-block: clamp(32px, 6vw, 80px) clamp(48px, 8vw, 96px);
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  min-width: 0;
}

.page-about .ab-index__label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .ab-index__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
}

.page-about .ab-index__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 2px;
  bottom: 2px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 55%, transparent 100%);
  transform: skewX(-9deg);
  transform-origin: top center;
}

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: 14px;
  line-height: 1.4;
  color: var(--mist);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

.page-about .ab-index__link .mono {
  font-size: 11px;
  color: var(--line);
  transition: color 160ms var(--ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--ice);
}

.page-about .ab-index__link:hover .mono,
.page-about .ab-index__link:focus-visible .mono {
  color: var(--cyan);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-body {
  min-width: 0;
}

.page-about .ab-sec {
  padding-block: clamp(30px, 4.6vw, 52px);
  border-top: 1px solid var(--line);
}

.page-about .ab-body > .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec__no {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .ab-sec__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 44px);
  line-height: 1.12;
  letter-spacing: -0.005em;
  max-width: 22em;
}

.page-about .ab-sec__lede {
  margin: 16px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.8;
  color: var(--ice);
}

.page-about .ab-sec__text {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 服务人群 ---------- */
.page-about .ab-audience {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-audience__item {
  background: var(--night-800);
  padding: 16px 18px;
}

.page-about .ab-audience__name {
  display: block;
  font-family: var(--font-label);
  font-weight: 600;
  font-size: 14px;
  color: var(--ice);
}

.page-about .ab-audience__text {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 四条通道 ---------- */
.page-about .ab-channels {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-channel {
  position: relative;
  padding: 20px 20px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .ab-channel:hover,
.page-about .ab-channel:focus-within {
  border-color: var(--cyan);
  background: #13294a;
}

.page-about .ab-channel__idx {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .ab-channel__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  line-height: 1.25;
  color: var(--ice);
}

.page-about .ab-channel__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-channel__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.7;
  color: var(--cyan);
  border-left: 2px solid var(--cyan);
  padding-left: 0;
  transition: max-height 300ms var(--ease), opacity 240ms var(--ease), margin 300ms var(--ease), padding 300ms var(--ease);
}

.page-about .ab-channel:hover .ab-channel__more,
.page-about .ab-channel:focus-within .ab-channel__more {
  max-height: 140px;
  opacity: 1;
  margin-top: 12px;
  padding-left: 12px;
}

/* ---------- 数据方法 ---------- */
.page-about .ab-method {
  display: grid;
  gap: 28px;
  margin-top: 24px;
}

.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-timeline__item {
  position: relative;
  padding: 0 0 24px 30px;
  border-left: 1px solid var(--line);
  margin-left: 8px;
}

.page-about .ab-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-timeline__mark {
  position: absolute;
  left: -8px;
  top: 4px;
  width: 15px;
  height: 15px;
  background: var(--night-900);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .ab-timeline__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--ice);
}

.page-about .ab-timeline__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 32em;
}

.page-about .ab-method__media,
.page-about .ab-partners__media {
  margin: 0;
}

.page-about .ab-method__media img,
.page-about .ab-partners__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  max-width: 100%;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-team__row {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .ab-team__name {
  font-family: var(--font-label);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .ab-team__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34em;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: 24px;
  margin-top: 20px;
}

.page-about .ab-partners__link {
  display: inline-block;
  margin-top: 18px;
  padding-bottom: 3px;
  font-family: var(--font-label);
  font-weight: 600;
  font-size: 14px;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  transition: opacity 160ms var(--ease);
}

.page-about .ab-partners__link:hover,
.page-about .ab-partners__link:focus-visible {
  opacity: 0.75;
}

/* ---------- 多端一致 ---------- */
.page-about .ab-ends {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-ends__item {
  position: relative;
  padding: 18px 18px 16px;
  background: var(--night-800);
  border-left: 2px solid var(--line);
  transition: border-color 160ms var(--ease);
}

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

.page-about .ab-ends__num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--violet);
}

.page-about .ab-ends__title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--ice);
}

.page-about .ab-ends__text {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(26px, 4.5vw, 44px);
  background:
    linear-gradient(135deg, rgba(61, 245, 192, 0.12) 0%, rgba(16, 33, 58, 0.9) 42%, var(--panel) 100%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .ab-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.16;
  color: var(--ice);
}

.page-about .ab-cta__text {
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-channels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-team__row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: start;
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-side) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 104px;
  }

  .page-about .ab-method {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(24px, 4vw, 48px);
  }

  .page-about .ab-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(24px, 4vw, 44px);
  }

  .page-about .ab-sec__title {
    max-width: 18em;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-channels {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .ab-channel {
    padding: 20px 16px 18px;
  }
}

@media (hover: none) {
  .page-about .ab-channel__more {
    max-height: 200px;
    opacity: 1;
    margin-top: 12px;
    padding-left: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-channel,
  .page-about .ab-channel__more,
  .page-about .ab-index__link,
  .page-about .ab-index__link .mono,
  .page-about .ab-ends__item,
  .page-about .ab-partners__link {
    transition: none;
  }
}
<<<END>>>