.page-about {
  --ab-rule: rgba(216, 222, 230, 0.18);
  --ab-rule-cyan: rgba(44, 229, 210, 0.26);
  --ab-rule-light: rgba(19, 30, 44, 0.14);
}

/* ---------- 通用排版 ---------- */

.page-about .t-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.2vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 24em;
}

.page-about .t-h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.page-about .ab-copy {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  margin: 0;
}

.page-about .ab-copy p {
  margin: 0 0 16px;
}

.page-about .ab-copy p:last-child {
  margin-bottom: 0;
}

.page-about .section__index {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 7.4vw, 72px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
  opacity: 0.5;
  margin: 0 0 10px;
}

.page-about .section--paper .section__index {
  color: var(--indigo);
  opacity: 0.3;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 56px;
  background: var(--ink-deep);
  color: var(--on-dark);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hair) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.55;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.15) 78%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.15) 78%, transparent 100%);
}

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

.page-about .ab-hero .breadcrumb a,
.page-about .ab-hero .breadcrumb li {
  color: var(--on-dark-dim);
}

.page-about .ab-hero .breadcrumb a:hover {
  color: var(--cyan);
}

.page-about .ab-hero__eyebrow {
  margin: 24px 0 0;
  color: var(--cyan);
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(31px, 7.4vw, 66px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.page-about .ab-hero__lead {
  margin: 24px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--on-dark-dim);
}

.page-about .ab-facts {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-facts li {
  background: var(--ink-deep);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-facts__num {
  font-size: 23px;
  line-height: 1.2;
  color: var(--orange);
}

.page-about .ab-facts__label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--on-dark-dim);
}

/* ---------- 01 品牌主张 ---------- */

.page-about .ab-belief__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .ab-belief__title {
  margin: 0 0 20px;
}

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

/* ---------- 02 原则 ---------- */

.page-about .ab-principles__title {
  margin-bottom: 16px;
}

.page-about .ab-principles__lead {
  max-width: 56ch;
  color: var(--on-dark-dim);
}

.page-about .ab-principles__list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-rule);
  border-top: 1px solid var(--ab-rule);
  border-bottom: 1px solid var(--ab-rule);
}

.page-about .ab-principle {
  position: relative;
  background: var(--indigo);
  padding: 24px 20px 24px 22px;
  border-left: 2px solid transparent;
  transition: background 240ms var(--ease), border-color 240ms var(--ease);
  outline: none;
}

.page-about .ab-principle:hover,
.page-about .ab-principle:focus-within,
.page-about .ab-principle:focus {
  background: rgba(44, 229, 210, 0.06);
  border-left-color: var(--cyan);
}

.page-about .ab-principle__no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .ab-principle__name {
  color: var(--on-dark);
}

.page-about .ab-principle__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--on-dark-dim);
  max-width: 60ch;
}

.page-about .ab-principle__extra {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  margin-top: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--cyan-mist);
  max-width: 60ch;
  transition: max-height 300ms var(--ease), opacity 300ms var(--ease), margin-top 300ms var(--ease);
}

.page-about .ab-principle:hover .ab-principle__extra,
.page-about .ab-principle:focus-within .ab-principle__extra,
.page-about .ab-principle:focus .ab-principle__extra {
  max-height: 140px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .ab-principle__extra a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-rule-cyan);
}

.page-about .ab-principle__extra a:hover {
  color: var(--on-dark);
}

/* ---------- 03 时间线 ---------- */

.page-about .ab-timeline {
  background: var(--ink-deep);
  color: var(--on-dark);
}

.page-about .ab-timeline__title {
  margin-bottom: 16px;
}

.page-about .ab-timeline__lead {
  max-width: 54ch;
  color: var(--on-dark-dim);
}

.page-about .ab-timeline__media {
  margin: 34px 0 0;
}

.page-about .ab-tl {
  list-style: none;
  margin: 42px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan) 0%, var(--ab-rule-cyan) 52%, rgba(44, 229, 210, 0) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding: 0 0 32px;
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -29.5px;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--ink-deep);
  border: 1px solid var(--cyan);
  box-sizing: border-box;
}

.page-about .ab-tl__item--now::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 61, 0.16);
}

.page-about .ab-tl__year {
  margin: 0 0 6px;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .ab-tl__item--now .ab-tl__year {
  color: var(--orange);
}

.page-about .ab-tl__title {
  margin: 0 0 8px;
  color: var(--on-dark);
  max-width: 30em;
}

.page-about .ab-tl__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--on-dark-dim);
  max-width: 58ch;
}

/* ---------- 04 团队 ---------- */

.page-about .ab-team__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

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

.page-about .ab-team__title {
  margin: 0 0 18px;
}

.page-about .ab-team__body .ab-copy {
  color: rgba(232, 240, 247, 0.82);
}

.page-about .ab-team__list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(232, 240, 247, 0.16);
  border: 1px solid rgba(232, 240, 247, 0.16);
}

.page-about .ab-team__list li {
  background: var(--jewel);
  padding: 20px;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 6px;
}

.page-about .ab-team__num {
  grid-column: 1;
  grid-row: 1 / 3;
  font-size: 30px;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-team__role {
  grid-column: 2;
  grid-row: 1;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--on-dark);
}

.page-about .ab-team__desc {
  grid-column: 2;
  grid-row: 2;
  font-size: 15px;
  line-height: 1.7;
  color: var(--on-dark-dim);
}

/* ---------- 05 资质与伙伴 ---------- */

.page-about .ab-cred__title {
  margin-bottom: 16px;
}

.page-about .ab-cred__lead {
  max-width: 54ch;
  color: var(--on-paper-dim);
}

.page-about .ab-cred__list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  border-bottom: 1px solid var(--ab-rule-light);
}

.page-about .ab-cred__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--ab-rule-light);
}

.page-about .ab-cred__meta {
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .ab-cred__body h3 {
  margin: 0 0 8px;
}

.page-about .ab-cred__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--on-paper-dim);
  max-width: 62ch;
}

/* ---------- 06 场景与覆盖 ---------- */

.page-about .ab-cases__title {
  margin-bottom: 16px;
}

.page-about .ab-cases__lead {
  max-width: 58ch;
  color: var(--on-dark-dim);
}

.page-about .ab-cases__grid {
  margin-top: 34px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ab-rule);
  border: 1px solid var(--ab-rule);
}

.page-about .ab-case {
  background: var(--indigo);
  padding: 26px 22px;
}

.page-about .ab-case__tag {
  display: inline-block;
  margin: 0 0 16px;
}

.page-about .ab-case h3 {
  margin: 0 0 10px;
  color: var(--on-dark);
}

.page-about .ab-case__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--on-dark-dim);
}

.page-about .ab-cases__more {
  margin: 30px 0 0;
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  background: linear-gradient(135deg, var(--ink-deep) 0%, var(--indigo) 56%, var(--jewel) 100%);
  color: var(--on-dark);
}

.page-about .ab-cta__box {
  border-left: 1px solid var(--ab-rule-cyan);
  padding-left: 22px;
}

.page-about .ab-cta__title {
  margin: 0 0 16px;
  max-width: 22em;
}

.page-about .ab-cta__text {
  color: var(--on-dark-dim);
  max-width: 58ch;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ab-cta__top {
  margin: 28px 0 0;
  font-size: 14px;
}

.page-about .ab-cta__top a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--ab-rule-cyan);
  padding-bottom: 2px;
}

.page-about .ab-cta__top a:hover {
  color: var(--on-dark);
}

/* ---------- 图片自适应 ---------- */

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

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .ab-hero {
    padding: 40px 0 80px;
  }

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

  .page-about .ab-principle {
    padding: 28px 28px 28px 30px;
  }

  .page-about .ab-cred__item {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 40px;
    align-items: baseline;
    padding: 26px 0;
  }
}

@media (min-width: 900px) {
  .page-about .ab-belief__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 72px;
    align-items: start;
  }

  .page-about .ab-team__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-cases__grid {
    grid-template-columns: 1.25fr 1fr 1fr;
  }

  .page-about .ab-tl {
    padding-left: 30px;
  }

  .page-about .ab-tl__item {
    padding-bottom: 40px;
  }

  .page-about .ab-tl__item::before {
    left: -33.5px;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-facts li {
    padding: 20px 22px;
  }

  .page-about .ab-cases__grid {
    grid-template-columns: 1.3fr 1fr 1fr;
  }
}
<<<END>>>