.page-about {
  background: var(--c-deep);
  color: var(--c-text);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 20px;
  padding-bottom: 4px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin: 0 8px;
  color: var(--c-line);
}

.page-about .breadcrumb a {
  color: var(--c-muted);
  text-decoration: none;
}

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

.page-about .breadcrumb [aria-current="page"] {
  color: var(--c-cyan);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  margin-top: 14px;
  padding: clamp(52px, 8vw, 100px) 0 clamp(44px, 6vw, 76px);
  background: var(--c-night);
}

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

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.4;
  filter: saturate(0.65) brightness(0.68);
}

.page-about .ab-hero__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    152deg,
    rgba(5, 10, 30, 0.94) 0%,
    rgba(5, 10, 30, 0.52) 46%,
    rgba(10, 16, 48, 0.97) 100%
  );
}

.page-about .ab-hero__scrim::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    116deg,
    transparent 61%,
    rgba(47, 240, 208, 0.12) 61.2%,
    rgba(47, 240, 208, 0.12) 62.6%,
    transparent 62.9%
  );
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 2;
  padding-top: 12px;
}

.page-about .ab-hero__title {
  margin: 20px 0 0;
  max-width: 20em;
  font-family: var(--sans);
  font-size: clamp(30px, 6.2vw, 58px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-about .ab-hero__lead {
  margin: 22px 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: rgba(234, 240, 255, 0.76);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 44px 0 0;
  padding: 0;
  background: var(--c-line-soft);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 16px 14px;
  background: rgba(19, 28, 68, 0.7);
}

.page-about .ab-fact dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}

.page-about .ab-fact dd {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(17px, 2.3vw, 23px);
  font-weight: 600;
  line-height: 1.2;
  color: var(--c-cyan);
}

/* ---------- 时间轴骨架 ---------- */

.page-about .ab-spine {
  position: relative;
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(40px, 6vw, 72px);
  padding-left: 26px;
}

.page-about .ab-spine__rail {
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent,
    var(--c-line) 3%,
    var(--c-line) 94%,
    transparent
  );
  pointer-events: none;
}

.page-about .ab-chapter {
  position: relative;
  padding-bottom: clamp(40px, 6vw, 70px);
}

.page-about .ab-chapter::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-deep);
  box-shadow: inset 0 0 0 1px var(--c-line);
  transition: background 240ms var(--ease), box-shadow 240ms var(--ease);
}

.page-about .ab-chapter.is-current::before {
  background: var(--c-cyan);
  box-shadow: 0 0 0 4px var(--c-cyan-soft);
}

.page-about .ab-chapter__index {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

.page-about .ab-chapter__code {
  color: var(--c-cyan);
}

.page-about .ab-chapter__label {
  color: var(--c-muted);
}

.page-about .ab-chapter__heading {
  margin: 0 0 16px;
  max-width: 18em;
  font-family: var(--sans);
  font-size: clamp(23px, 3.6vw, 36px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-about .ab-chapter__lead {
  margin: 0 0 16px;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-muted);
}

.page-about .ab-chapter__body > p {
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-muted);
}

.page-about .ab-rule {
  height: 1px;
  margin-bottom: clamp(40px, 6vw, 70px);
  background: linear-gradient(
    90deg,
    var(--c-cyan),
    rgba(47, 240, 208, 0.1) 26%,
    transparent 68%
  );
}

.page-about .ab-chapter:last-child .ab-rule {
  display: none;
}

/* ---------- 三件事 ---------- */

.page-about .ab-pillars {
  display: grid;
  gap: 1px;
  margin-top: 30px;
  background: var(--c-line-soft);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-pillar {
  padding: 24px 20px 22px;
  background: var(--c-cabin);
}

.page-about .ab-pillar__idx {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}

.page-about .ab-pillar h3 {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--c-text);
}

.page-about .ab-pillar p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
}

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

/* ---------- 版本演进 ---------- */

.page-about .ab-versions {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-version {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  column-gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--c-line-soft);
}

.page-about .ab-version:first-child {
  border-top: 0;
  padding-top: 8px;
}

.page-about .ab-version__code {
  padding-top: 3px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

.page-about .ab-version__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--c-text);
}

.page-about .ab-version__text p {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
}

.page-about .ab-version--latest {
  padding-left: 16px;
  padding-right: 14px;
  border-top-color: transparent;
  border-left: 2px solid var(--c-cyan);
  border-radius: var(--radius);
  background: linear-gradient(100deg, var(--c-cyan-soft), transparent 74%);
}

.page-about .ab-version--latest .ab-version__title {
  color: var(--c-cyan);
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  display: grid;
  gap: 30px;
  margin-top: 28px;
}

.page-about .ab-bars {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 22px;
}

.page-about .ab-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
}

.page-about .ab-bar__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
}

.page-about .ab-bar__val {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--c-cyan);
}

.page-about .ab-bar__track {
  height: 8px;
  border-radius: 4px;
  background: var(--c-cabin);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(47, 240, 208, 0.28));
}

.page-about .ab-bar:nth-child(1) .ab-bar__fill {
  width: 69%;
}

.page-about .ab-bar:nth-child(2) .ab-bar__fill {
  width: 19%;
}

.page-about .ab-bar:nth-child(3) .ab-bar__fill {
  width: 13%;
}

.page-about .ab-bar__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-muted);
  transition: max-height 240ms var(--ease), opacity 240ms var(--ease),
    margin-top 240ms var(--ease);
}

.page-about .ab-bar:hover .ab-bar__more,
.page-about .ab-bar:focus-within .ab-bar__more {
  max-height: 8em;
  opacity: 1;
  margin-top: 10px;
}

.page-about .ab-team__fig {
  margin: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-cabin);
}

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

.page-about .ab-team__fig figcaption {
  padding: 12px 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--c-muted);
  border-top: 1px solid var(--c-line);
}

/* ---------- 覆盖网络 ---------- */

.page-about .ab-coverage {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}

.page-about .ab-coverage__stats {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--c-line-soft);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-cov {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  background: var(--c-cabin);
}

.page-about .ab-cov__num {
  font-family: var(--mono);
  font-size: clamp(19px, 2.5vw, 25px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-cyan);
  white-space: nowrap;
}

.page-about .ab-cov__label {
  font-size: 14px;
  line-height: 1.6;
  text-align: right;
  color: var(--c-muted);
}

.page-about .ab-coverage__visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-night);
}

.page-about .ab-coverage__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.46;
}

.page-about .ab-coverage__dots {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(
    circle,
    rgba(47, 240, 208, 0.6) 1.5px,
    transparent 1.7px
  );
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(
    ellipse 62% 58% at 44% 46%,
    #000 8%,
    transparent 74%
  );
  mask-image: radial-gradient(
    ellipse 62% 58% at 44% 46%,
    #000 8%,
    transparent 74%
  );
}

.page-about .ab-coverage__visual figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--c-muted);
  background: linear-gradient(0deg, rgba(5, 10, 30, 0.94), transparent);
}

/* ---------- 合作生态 ---------- */

.page-about .ab-partners {
  display: flex;
  gap: 14px;
  margin-top: 26px;
  padding-bottom: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--c-line) transparent;
}

.page-about .ab-partners:focus-visible {
  outline: 1px solid var(--c-cyan);
  outline-offset: 4px;
}

.page-about .ab-partner {
  flex: 0 0 80%;
  max-width: 320px;
  scroll-snap-align: start;
  padding: 22px 20px;
  background: var(--c-cabin);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.page-about .ab-partner__title {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.45;
  color: var(--c-text);
}

.page-about .ab-partner__rule {
  height: 1px;
  margin: 14px 0;
  background-image: linear-gradient(
    90deg,
    var(--c-line) 0 4px,
    transparent 4px 8px
  );
  background-size: 8px 1px;
  background-repeat: repeat-x;
}

.page-about .ab-partner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 被记住的几次 ---------- */

.page-about .ab-recognitions {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: var(--c-line-soft);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.page-about .ab-rec {
  padding: 22px 18px;
  background: var(--c-deep);
}

.page-about .ab-rec__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(23px, 3.2vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-green);
}

.page-about .ab-rec:nth-child(2) .ab-rec__num {
  color: var(--c-cyan);
}

.page-about .ab-rec:nth-child(3) .ab-rec__num {
  color: var(--c-violet);
}

.page-about .ab-rec:nth-child(4) .ab-rec__num {
  color: var(--c-orange);
}

.page-about .ab-rec__label {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------- 收束 ---------- */

.page-about .ab-close {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 52px) clamp(20px, 4vw, 46px);
  background: linear-gradient(140deg, var(--c-cabin), var(--c-night) 78%);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.page-about .ab-close::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 240, 208, 0.14), transparent 68%);
  pointer-events: none;
}

.page-about .ab-close__line {
  margin: 0 0 16px;
  max-width: 18em;
  font-size: clamp(21px, 3.2vw, 32px);
  font-weight: 900;
  line-height: 1.34;
  letter-spacing: -0.02em;
  color: var(--c-text);
}

.page-about .ab-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-close__sub {
  margin: 34px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--c-orange);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.6;
  color: var(--c-text);
}

.page-about .ab-prep {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .ab-prep li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .ab-prep li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 10px;
  height: 1px;
  background: var(--c-orange);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-partner {
    flex: 0 0 300px;
  }
}

@media (min-width: 760px) {
  .page-about .ab-pillars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-pillars .ab-pillar:first-child {
    grid-row: span 2;
  }
}

@media (min-width: 900px) {
  .page-about .ab-spine {
    padding-left: 0;
  }

  .page-about .ab-spine__rail {
    left: 118px;
  }

  .page-about .ab-chapter {
    display: grid;
    grid-template-columns: 118px minmax(0, 1fr);
    column-gap: 56px;
  }

  .page-about .ab-chapter::before {
    left: 115px;
    top: 15px;
  }

  .page-about .ab-chapter__index {
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    margin-bottom: 0;
    padding-top: 9px;
    text-align: right;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .ab-coverage {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 40px;
  }
}

@media (min-width: 980px) {
  .page-about .ab-recognitions {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (hover: none) {
  .page-about .ab-bar__more {
    max-height: 8em;
    opacity: 1;
    margin-top: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
<<<END>>>