.page-about {
  --ab-sec-y: 56px;
  --ab-cut: 6deg;
  --ab-radius: 2px;
  display: block;
}

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

/* ---------- Hero ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 28px 0 44px;
  background: var(--night);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(158deg, var(--stand) 0%, var(--board) 72%, var(--night) 100%);
  clip-path: polygon(38% 0, 100% 0, 100% 100%, 8% 100%);
  opacity: 0.92;
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.28;
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .ab-hero__copy {
  min-width: 0;
}

.page-about .ab-hero .breadcrumbs {
  margin-bottom: 22px;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 8vw, 84px);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--warm);
  max-width: 13em;
}

.page-about .ab-hero__lede {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .ab-hero__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 页内章节索引 */

.page-about .ab-index {
  min-width: 0;
  padding: 18px 18px 8px;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: rgba(11, 18, 32, 0.74);
}

.page-about .ab-index__lede {
  margin: 0 0 8px;
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

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

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

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 10px 0;
  text-decoration: none;
  color: var(--warm);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .ab-index__num {
  flex: none;
  width: 2.2em;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--line);
  transition: color 0.2s var(--ease);
}

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

.page-about .ab-index__label {
  font-size: 14px;
  line-height: 1.5;
}

/* ---------- 通用区块 ---------- */

.page-about .ab-sec {
  padding-top: var(--ab-sec-y);
  padding-bottom: var(--ab-sec-y);
  background: var(--night);
}

.page-about .ab-sec--board {
  background: var(--stand);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-sec__head {
  max-width: 46em;
  margin-bottom: 32px;
}

.page-about .ab-sec__title {
  margin: 12px 0 0;
  font-size: clamp(26px, 4.4vw, 44px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--warm);
}

.page-about .ab-sec__lede {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 34em;
}

.page-about .ab-sec .body-text {
  color: var(--warm);
  margin: 0 0 18px;
  max-width: 34em;
}

.page-about .ab-sec .note {
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

.page-about .text-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: border-color 0.2s var(--ease);
}

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

/* ---------- 01 起点与主张 ---------- */

.page-about .ab-split {
  display: grid;
  gap: 32px;
}

.page-about .ab-split__main {
  min-width: 0;
}

.page-about .ab-split__aside {
  min-width: 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .ab-aside__title {
  margin: 0 0 16px;
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

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

.page-about .ab-who__item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px 14px;
  background: var(--stand);
  transition: background 0.2s var(--ease);
}

.page-about .ab-who__item:hover {
  background: var(--board);
}

.page-about .ab-who__k {
  flex: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .ab-who__v {
  font-size: 14px;
  line-height: 1.7;
  color: var(--warm);
}

/* ---------- 02 球队库层级 ---------- */

.page-about .ab-lib {
  display: grid;
  gap: 32px;
}

.page-about .ab-lib__diagram,
.page-about .ab-lib__side {
  min-width: 0;
}

.page-about .ab-levels {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-levels__row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  align-items: stretch;
  border: 1px solid var(--line);
  border-top: none;
  background: var(--night);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .ab-levels__row:first-child {
  border-top: 1px solid var(--line);
}

.page-about .ab-levels__row:hover {
  border-color: var(--cyan);
  background: var(--board);
}

.page-about .ab-levels__row--2 {
  margin-left: 14px;
}

.page-about .ab-levels__row--3 {
  margin-left: 28px;
}

.page-about .ab-levels__num {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border-right: 1px solid var(--line);
}

.page-about .ab-levels__box {
  padding: 16px 14px;
  min-width: 0;
}

.page-about .ab-levels__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 500;
  color: var(--warm);
  letter-spacing: 0.02em;
}

.page-about .ab-levels__meta {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .ab-levels__note {
  margin: 18px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
}

.page-about .ab-lib__media {
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-lib__side .note {
  margin: 14px 0 0;
}

/* ---------- 03 四条主线 ---------- */

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

.page-about .ab-line {
  position: relative;
  padding: 24px 20px 22px;
  background: var(--night);
  min-width: 0;
  transition: background 0.2s var(--ease);
}

.page-about .ab-line:hover {
  background: var(--stand);
}

.page-about .ab-line__num {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--line);
  transition: color 0.2s var(--ease);
}

.page-about .ab-line:hover .ab-line__num {
  color: var(--cyan);
}

.page-about .ab-line__title {
  margin: 12px 0 10px;
  font-size: 19px;
  font-weight: 500;
  line-height: 1.3;
  color: var(--warm);
}

.page-about .ab-line__text {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 30em;
}

.page-about .ab-line__link {
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ---------- 04 时间轴 ---------- */

.page-about .ab-timeline__media {
  margin-bottom: 34px;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .ab-timeline__item {
  position: relative;
  padding-bottom: 22px;
}

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

.page-about .ab-timeline__dot {
  position: absolute;
  left: -26px;
  top: 20px;
  width: 9px;
  height: 9px;
  background: var(--night);
  border: 1px solid var(--line);
  transform: rotate(45deg);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

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

.page-about .ab-timeline__card {
  min-width: 0;
  padding: 18px 16px;
  border: 1px solid var(--line);
  background: var(--night);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

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

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

.page-about .ab-timeline__year {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .ab-timeline__ver {
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .ab-timeline__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.35;
  color: var(--warm);
}

.page-about .ab-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  max-width: 32em;
}

/* ---------- 05 服务覆盖 ---------- */

.page-about .ab-cover {
  display: grid;
  gap: 32px;
}

.page-about .ab-cover__main,
.page-about .ab-cover__side {
  min-width: 0;
}

.page-about .ab-cover__media {
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-facts {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-facts__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 16px;
  background: var(--stand);
}

.page-about .ab-facts__num {
  flex: none;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--pure);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 06 合作 ---------- */

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

.page-about .ab-partner-card {
  padding: 24px 20px;
  background: var(--night);
  min-width: 0;
  transition: background 0.2s var(--ease);
}

.page-about .ab-partner-card:hover {
  background: var(--board);
}

.page-about .ab-partner-card__num {
  margin: 0;
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-partner-card__title {
  margin: 14px 0 8px;
  font-size: 16px;
  font-weight: 500;
  color: var(--warm);
}

.page-about .ab-partner-card__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-partners__note {
  margin: 24px 0 0;
  max-width: 46em;
}

/* ---------- 07 承诺 ---------- */

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

.page-about .ab-promise {
  padding: 24px 20px;
  background: var(--night);
  min-width: 0;
  border-left: 2px solid var(--line);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

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

.page-about .ab-promise__num {
  display: block;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--line);
  transition: color 0.2s var(--ease);
}

.page-about .ab-promise:hover .ab-promise__num {
  color: var(--cyan);
}

.page-about .ab-promise__title {
  margin: 12px 0 10px;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.35;
  color: var(--warm);
}

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

.page-about .ab-cta {
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 20px;
}

.page-about .ab-cta__text {
  margin: 0;
  font-size: 17px;
  line-height: 1.7;
  color: var(--warm);
  max-width: 28em;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 媒体查询 ---------- */

@media (min-width: 640px) {
  .page-about {
    --ab-sec-y: 72px;
  }

  .page-about .ab-hero {
    padding: 40px 0 56px;
  }

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

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

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

  .page-about .ab-facts__item {
    flex-direction: column;
    gap: 8px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --ab-sec-y: 96px;
  }

  .page-about .ab-hero {
    padding: 52px 0 76px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: 64px;
    align-items: end;
  }

  .page-about .ab-index {
    padding: 22px 22px 10px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: 64px;
  }

  .page-about .ab-split__aside {
    padding-top: 0;
    border-top: none;
    border-left: 1px solid var(--line);
    padding-left: 32px;
  }

  .page-about .ab-lib {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 56px;
    align-items: start;
  }

  .page-about .ab-levels__row--2 {
    margin-left: 32px;
  }

  .page-about .ab-levels__row--3 {
    margin-left: 64px;
  }

  .page-about .ab-levels__num {
    font-size: 12px;
  }

  .page-about .ab-cover {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    column-gap: 56px;
    align-items: start;
  }

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

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 40px;
  }

  /* 时间轴左右交替 */
  .page-about .ab-timeline {
    padding-left: 0;
    display: grid;
    row-gap: 8px;
  }

  .page-about .ab-timeline::before {
    left: 50%;
    top: 10px;
    bottom: 14px;
  }

  .page-about .ab-timeline__item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 64px;
    padding-bottom: 12px;
  }

  .page-about .ab-timeline__dot {
    left: 50%;
    top: 26px;
    margin-left: -4.5px;
  }

  .page-about .ab-timeline__item:nth-child(odd) .ab-timeline__card {
    grid-column: 1;
    text-align: right;
  }

  .page-about .ab-timeline__item:nth-child(odd) .ab-timeline__head {
    justify-content: flex-end;
  }

  .page-about .ab-timeline__item:nth-child(odd) .ab-timeline__text {
    margin-left: auto;
  }

  .page-about .ab-timeline__item:nth-child(even) .ab-timeline__card {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-timeline__item:hover .ab-timeline__card,
  .page-about .ab-index__link,
  .page-about .ab-line,
  .page-about .ab-promise {
    transform: none;
    transition: none;
  }
}
<<<END>>>