.page-about {
  background: var(--void);
  color: var(--ice);
  overflow-x: clip;
}

.page-about .ab-topbar {
  background: var(--void-deep);
  border-bottom: 1px solid var(--steel);
  padding-block: 0.9rem 0.6rem;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(2rem, 5vw, 3.5rem) clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(34, 211, 238, 0.16), transparent 62%),
    linear-gradient(180deg, var(--void) 0%, var(--void-deep) 100%);
  border-bottom: 1px solid var(--steel);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -18%;
  width: 62%;
  height: 150%;
  background: linear-gradient(
    105deg,
    transparent 46%,
    rgba(34, 211, 238, 0.09) 46.4%,
    rgba(34, 211, 238, 0.09) 48%,
    transparent 48.4%
  );
  transform: rotate(-8deg);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-about .ab-hero__title {
  font-family: var(--font-head);
  font-size: clamp(1.85rem, 5.4vw, 3.3rem);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0.7rem 0 0;
  max-width: 22ch;
}

.page-about .ab-hero__lede {
  margin: 1.1rem 0 0;
  max-width: 52ch;
  color: var(--mist);
  font-size: clamp(0.96rem, 1.7vw, 1.08rem);
  line-height: 1.8;
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 1.1rem 0 0;
  border-top: 1px solid var(--steel);
  display: grid;
  gap: 0.9rem;
}

.page-about .ab-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about .ab-hero__num {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .ab-hero__cap {
  color: var(--mist);
  font-size: 0.86rem;
  line-height: 1.5;
}

.page-about .ab-hero__figure {
  margin: 0;
  border: 1px solid var(--steel);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 章节通用 ---------- */
.page-about .ab-section {
  position: relative;
  padding-block: clamp(2.4rem, 5.5vw, 4.25rem);
  border-top: 1px solid var(--steel);
}

.page-about .ab-sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  margin-bottom: 1.8rem;
}

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

.page-about .ab-h2 {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3.6vw, 2.1rem);
  line-height: 1.28;
  letter-spacing: -0.02em;
  margin: 0.25rem 0 0.6rem;
  color: var(--ice);
}

.page-about .ab-intro {
  margin: 0;
  max-width: 56ch;
  color: var(--mist);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.page-about .ab-timeline__item {
  display: grid;
  grid-template-columns: 3.6rem minmax(0, 1fr);
  gap: 0.8rem;
  padding: 0.9rem 0;
  transition: transform 0.25s var(--ease);
}

.page-about .ab-timeline__item:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 4px;
}

.page-about .ab-timeline__year {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
  padding-top: 0.15rem;
  text-align: right;
}

.page-about .ab-timeline__body {
  position: relative;
  border-left: 2px solid var(--steel);
  padding: 0 0 0.1rem 1.15rem;
  transition: border-color 0.25s var(--ease);
}

.page-about .ab-timeline__body::before {
  content: "";
  position: absolute;
  left: -0.44rem;
  top: 0.42rem;
  width: 0.6rem;
  height: 0.6rem;
  background: var(--void);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .ab-timeline__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-head);
  font-size: 1.06rem;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-timeline__text {
  margin: 0;
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.78;
  max-width: 52ch;
}

.page-about .ab-timeline__note {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  letter-spacing: 0.01em;
  transition: max-height 0.3s var(--ease), opacity 0.3s var(--ease), margin-top 0.3s var(--ease);
}

.page-about .ab-timeline__item:hover .ab-timeline__body,
.page-about .ab-timeline__item:focus-within .ab-timeline__body {
  border-color: var(--cyan);
}

.page-about .ab-timeline__item:hover .ab-timeline__note,
.page-about .ab-timeline__item:focus-within .ab-timeline__note {
  max-height: 6rem;
  opacity: 1;
  margin-top: 0.5rem;
}

/* ---------- 能力线 ---------- */
.page-about .ab-caps {
  display: grid;
  gap: 1rem;
}

.page-about .ab-cap {
  --ab-accent: var(--cyan);
  background: var(--panel);
  border: 1px solid var(--steel);
  box-shadow: var(--shadow-hard);
  padding: 1.2rem 1.15rem 1.3rem;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .ab-cap--data {
  border-width: 4px;
}

.page-about .ab-cap--content {
  --ab-accent: var(--orange);
  border-width: 2px;
}

.page-about .ab-cap--ops {
  --ab-accent: var(--green);
  border-width: 1px;
  border-style: dashed;
}

.page-about .ab-cap:hover,
.page-about .ab-cap:focus-within {
  transform: translateY(-3px);
  border-color: var(--ab-accent);
}

.page-about .ab-cap__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--ab-accent);
  text-transform: uppercase;
}

.page-about .ab-cap__title {
  margin: 0.55rem 0 0.5rem;
  font-family: var(--font-head);
  font-size: 1.12rem;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-cap__text {
  margin: 0;
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.78;
}

.page-about .ab-cap__list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0.8rem 0 0;
  border-top: 1px solid var(--steel);
  display: grid;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--mist);
}

.page-about .ab-cap__num {
  font-family: var(--font-mono);
  color: var(--ice);
  margin-right: 0.35rem;
  letter-spacing: 0.04em;
}

.page-about .ab-caps__figure {
  margin: 1.4rem 0 0;
  border: 1px solid var(--steel);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- V2.0 演进 ---------- */
.page-about .ab-evo {
  display: grid;
  gap: 1.4rem;
  padding: 1.3rem 1.15rem;
  background: linear-gradient(158deg, var(--panel-soft) 0%, var(--void-deep) 100%);
  border: 1px solid var(--steel);
  border-left: 4px solid var(--cyan);
}

.page-about .ab-evo__stamp {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.35rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--steel);
}

.page-about .ab-evo__version {
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 9vw, 3.6rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .ab-evo__stamp-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .ab-evo__rows {
  display: grid;
  gap: 1.1rem;
}

.page-about .ab-evo__row {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 0.8rem;
  align-items: start;
}

.page-about .ab-evo__code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--orange);
  padding: 0.2rem 0.35rem;
  border: 1px solid rgba(255, 122, 26, 0.45);
  text-align: center;
}

.page-about .ab-evo__title {
  margin: 0 0 0.3rem;
  font-size: 1rem;
  font-family: var(--font-head);
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-evo__text {
  margin: 0;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .ab-band {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .ab-band__cell {
  background: var(--void-deep);
  padding: 1rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .ab-band__num {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4.2vw, 2rem);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .ab-band__num--orange {
  color: var(--orange);
}

.page-about .ab-band__label {
  font-size: 0.8rem;
  line-height: 1.45;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 1.5rem;
}

.page-about .ab-roles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.page-about .ab-role {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--panel);
  border: 1px solid var(--steel);
  font-size: 0.9rem;
  color: var(--ice);
  cursor: default;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-role:hover,
.page-about .ab-role:focus-visible {
  border-color: var(--green);
  transform: translateY(-2px);
}

.page-about .ab-role:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.page-about .ab-role__count {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--green);
  letter-spacing: 0.04em;
}

.page-about .ab-role__tip {
  position: absolute;
  left: 0;
  bottom: calc(100% + 0.5rem);
  width: min(16rem, 68vw);
  padding: 0.6rem 0.7rem;
  background: var(--panel-soft);
  border: 1px solid var(--green);
  color: var(--mist);
  font-size: 0.8rem;
  line-height: 1.6;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
  z-index: 6;
}

.page-about .ab-role:hover .ab-role__tip,
.page-about .ab-role:focus-visible .ab-role__tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .ab-partners {
  margin-top: 1.5rem;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
}

.page-about .ab-partners__item {
  background: var(--void-deep);
  padding: 0.9rem 1rem;
  display: grid;
  gap: 0.2rem;
}

.page-about .ab-partners__num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  color: var(--ice);
  letter-spacing: 0.03em;
}

.page-about .ab-partners__label {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .ab-team__figure {
  margin: 0;
  border: 1px solid var(--steel);
  box-shadow: var(--shadow-hard);
}

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

/* ---------- 服务原则 ---------- */
.page-about .ab-section--quality {
  background: linear-gradient(180deg, var(--void-deep) 0%, var(--void) 100%);
}

.page-about .ab-quality {
  max-width: 44rem;
}

.page-about .ab-quality > p {
  margin: 0 0 1.2rem;
  color: var(--mist);
  font-size: 0.96rem;
  line-height: 1.85;
}

.page-about .ab-quality .disclosure {
  margin-top: 0.7rem;
  border: 1px solid var(--steel);
  background: var(--panel);
  transition: border-color 0.2s var(--ease);
}

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

/* ---------- 结尾入口 ---------- */
.page-about .ab-section--cta {
  background: var(--void-deep);
}

.page-about .ab-cta {
  display: grid;
  gap: 1.4rem;
  padding: 1.4rem 1.2rem;
  border: 1px solid var(--steel);
  border-top: 3px solid var(--orange);
  background: var(--panel);
  box-shadow: var(--shadow-lift);
}

.page-about .ab-cta__text {
  margin: 0;
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .ab-cta__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .ab-cta__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--steel);
  color: var(--ice);
  text-decoration: none;
  font-size: 0.92rem;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-cta__link span {
  font-family: var(--font-mono);
  color: var(--cyan);
}

.page-about .ab-cta__link:hover,
.page-about .ab-cta__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
  transform: translateX(2px);
}

.page-about .ab-cta__link:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- 媒体查询 ---------- */
@media (max-width: 719px) {
  .page-about .ab-timeline__note {
    max-height: none;
    opacity: 1;
    margin-top: 0.5rem;
  }

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

@media (min-width: 640px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
  }

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

@media (min-width: 780px) {
  .page-about .ab-caps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-cap--content {
    transform: translateY(1.5rem);
  }

  .page-about .ab-cap--ops {
    transform: translateY(0.75rem);
  }

  .page-about .ab-cap--content:hover,
  .page-about .ab-cap--content:focus-within {
    transform: translateY(calc(1.5rem - 3px));
  }

  .page-about .ab-cap--ops:hover,
  .page-about .ab-cap--ops:focus-within {
    transform: translateY(calc(0.75rem - 3px));
  }

  .page-about .ab-caps__figure {
    margin-top: 3rem;
  }

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

  .page-about .ab-team {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 2rem;
    align-items: start;
  }

  .page-about .ab-cta {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    padding: 1.9rem 1.8rem;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 2.5rem;
    align-items: center;
  }

  .page-about .ab-hero__figure {
    transform: translateY(1rem);
  }

  .page-about .ab-evo {
    grid-template-columns: 14rem minmax(0, 1fr);
    gap: 2.2rem;
    padding: 1.9rem 1.8rem;
  }

  .page-about .ab-evo__stamp {
    border-bottom: 0;
    border-right: 1px solid var(--steel);
    padding: 0 1.4rem 0 0;
    min-height: 100%;
  }

  .page-about .ab-timeline {
    gap: 0.9rem;
  }

  .page-about .ab-timeline__item {
    grid-template-columns: 5rem minmax(0, 1fr);
    gap: 1.4rem;
    padding: 1.1rem 0;
  }

  .page-about .ab-timeline__item:nth-child(even) {
    margin-left: 3.5rem;
  }

  .page-about .ab-timeline__item:nth-child(3) {
    margin-left: 1.5rem;
  }

  .page-about .ab-timeline__year {
    font-size: 1.05rem;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__figure {
    transform: translateY(1.75rem);
  }

  .page-about .ab-cap {
    padding: 1.5rem 1.4rem 1.6rem;
  }
}
<<<END>>>