.page-about {
  --ab-shadow: 0 24px 60px rgba(0, 0, 0, .45);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 104px 0 56px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero-plane {
  position: absolute;
  top: -140px;
  right: -20%;
  width: 64%;
  height: 540px;
  background: linear-gradient(155deg, rgba(12, 21, 38, .95) 0%, rgba(26, 34, 51, .30) 58%, rgba(5, 7, 14, 0) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  transform: rotate(-7deg);
  pointer-events: none;
}

.page-about .ab-hero-glow {
  position: absolute;
  inset: -30% -12% auto -22%;
  height: 640px;
  pointer-events: none;
  background:
    radial-gradient(34% 54% at 24% 42%, rgba(198, 244, 50, .13), transparent 70%),
    radial-gradient(30% 48% at 76% 24%, rgba(127, 227, 255, .12), transparent 72%),
    radial-gradient(24% 40% at 92% 66%, rgba(255, 106, 26, .09), transparent 70%);
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--grey);
}

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

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

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime);
}

.page-about .ab-title {
  margin: 16px 0 0;
  max-width: 17ch;
}

.page-about .ab-hero-lead {
  margin: 22px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--grey);
}

.page-about .ab-hero-figs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  align-self: end;
}

.page-about .ab-fig {
  background: var(--ink-bg);
  padding: 18px 18px 16px;
}

.page-about .ab-fig-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-fig-num em {
  font-style: normal;
  font-size: 14px;
  margin-left: 3px;
  color: var(--lime);
}

.page-about .ab-fig-cap {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--grey);
}

/* ---------- 通用段落 ---------- */
.page-about .ab-sec {
  padding-block: clamp(56px, 8vw, 104px);
}

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

.page-about .ab-sec-head {
  max-width: 720px;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-sec-head h2 {
  margin: 14px 0 0;
}

.page-about .ab-sec-head p {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--grey);
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl-band {
  position: relative;
  margin: 0 0 clamp(28px, 4vw, 46px);
  height: clamp(104px, 20vw, 210px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .ab-tl-band img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .5;
}

.page-about .ab-tl-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(5, 7, 14, .92) 0%, rgba(5, 7, 14, .08) 46%, rgba(5, 7, 14, .88) 100%);
}

.page-about .ab-tl {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 47px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime) 0%, rgba(198, 244, 50, .22) 55%, rgba(198, 244, 50, 0) 100%);
}

.page-about .ab-tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: 43px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-bg);
  border: 2px solid var(--lime);
  z-index: 2;
}

.page-about .ab-tl-num {
  padding-top: 4px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--lime);
}

.page-about .ab-tl-card {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 20px 20px 22px;
  transition: border-color .25s var(--ease), background .25s var(--ease), transform .25s var(--ease);
}

.page-about .ab-tl-item:hover .ab-tl-card,
.page-about .ab-tl-item:focus-within .ab-tl-card {
  border-color: rgba(198, 244, 50, .42);
  background: var(--ink-3);
  transform: translateY(-3px);
}

.page-about .ab-tl-year {
  display: inline-block;
  padding: 3px 11px;
  border-radius: var(--pill);
  background: var(--lime-veil);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  color: var(--lime);
}

.page-about .ab-tl-title {
  margin: 14px 0 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .ab-tl-text {
  margin: 11px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--grey);
}

.page-about .ab-tl-gain {
  margin: 15px 0 0;
  padding-top: 13px;
  border-top: 1px dashed var(--line-strong);
  font-size: 14px;
  line-height: 1.8;
  color: var(--white);
}

.page-about .ab-tl-gain b {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--lime);
}

/* ---------- 数据流程 ---------- */
.page-about .ab-flow-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-flow-head h2 {
  margin: 14px 0 0;
}

.page-about .ab-flow-lead {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--grey);
}

.page-about .ab-flow-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .ab-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .ab-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-step {
  position: relative;
  padding: 20px 18px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.page-about .ab-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-s);
  border: 1px solid rgba(198, 244, 50, .45);
  background: var(--lime-veil);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--lime);
}

.page-about .ab-step-title {
  margin: 14px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .ab-step-text {
  margin: 9px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--grey);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .ab-team-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .ab-team-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-team-panel {
  display: grid;
  gap: 18px;
  justify-items: center;
  align-content: center;
  padding: 26px 22px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
}

.page-about .ab-ring {
  margin: 0;
  width: min(220px, 74%);
}

.page-about .ab-ring svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-ring-track {
  fill: none;
  stroke: var(--ink-3);
  stroke-width: 18;
}

.page-about .ab-ring-seg {
  fill: none;
  stroke-width: 18;
}

.page-about .ab-ring-seg--a { stroke: var(--lime); }
.page-about .ab-ring-seg--b { stroke: var(--ice); }
.page-about .ab-ring-seg--c { stroke: var(--orange); }
.page-about .ab-ring-seg--d { stroke: var(--grey); }

.page-about .ab-ring-num {
  fill: var(--white);
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
}

.page-about .ab-ring-cap {
  fill: var(--grey);
  font-size: 12px;
}

.page-about .ab-ring-key {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--grey);
}

.page-about .ab-ring-key li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .ab-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: none;
}

.page-about .ab-dot--a { background: var(--lime); }
.page-about .ab-dot--b { background: var(--ice); }
.page-about .ab-dot--c { background: var(--orange); }
.page-about .ab-dot--d { background: var(--grey); }

.page-about .ab-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .ab-role {
  background: var(--ink-2);
  padding: 22px 22px 24px;
  transition: background .25s var(--ease);
}

.page-about .ab-role:hover {
  background: var(--ink-3);
}

.page-about .ab-role-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 0;
}

.page-about .ab-role-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .ab-role-count {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--lime);
}

.page-about .ab-role-text {
  margin: 11px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--grey);
}

/* ---------- 合作伙伴 ---------- */
.page-about .ab-partners-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
}

.page-about .ab-partner {
  background: var(--ink-2);
  padding: 26px 22px 28px;
}

.page-about .ab-partner-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-partner-title {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.page-about .ab-partner-text {
  margin: 11px 0 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--grey);
}

/* ---------- 资质与站点信息 ---------- */
.page-about .ab-sec--facts {
  background: var(--ink-2);
}

.page-about .ab-facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-honor {
  padding: 26px 24px 28px;
  border: 1px solid rgba(198, 244, 50, .3);
  border-radius: var(--radius-l);
  background: linear-gradient(140deg, var(--lime-veil) 0%, rgba(30, 51, 32, .25) 55%, var(--ink-2) 100%);
}

.page-about .ab-honor-title {
  margin: 12px 0 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-about .ab-honor-text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--grey);
}

.page-about .ab-fact-list {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--ink-bg);
}

.page-about .ab-fact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 17px 22px;
  border-top: 1px solid var(--line);
}

.page-about .ab-fact:first-child {
  border-top: 0;
}

.page-about .ab-fact dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--grey);
}

.page-about .ab-fact dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--white);
  word-break: break-word;
}

.page-about .ab-fact dd a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 227, 255, .35);
}

.page-about .ab-fact dd a:hover,
.page-about .ab-fact dd a:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .ab-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 滚动显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 760px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .ab-fact {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-about .ab-hero {
    padding: 140px 0 88px;
  }

  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 56px;
    row-gap: 30px;
  }

  .page-about .breadcrumb {
    grid-column: 1 / -1;
  }

  .page-about .ab-hero-main {
    grid-column: 1;
  }

  .page-about .ab-hero-figs {
    grid-column: 2;
    grid-row: 2;
  }

  .page-about .ab-tl {
    gap: 22px;
  }

  .page-about .ab-tl::before {
    left: 95px;
  }

  .page-about .ab-tl-item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .ab-tl-item::before {
    left: 91px;
  }

  .page-about .ab-tl-item:nth-child(odd) .ab-tl-card {
    max-width: 780px;
  }

  .page-about .ab-tl-item:nth-child(even) .ab-tl-card {
    max-width: 620px;
    margin-left: 68px;
  }

  .page-about .ab-tl-num {
    font-size: 13px;
  }

  .page-about .ab-flow-head {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 48px;
    align-items: end;
  }

  .page-about .ab-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
    border: 1px solid var(--line);
    border-radius: var(--radius-l);
    overflow: hidden;
    background: var(--ink-2);
  }

  .page-about .ab-step {
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
    padding: 26px 20px 30px;
    transition: background .25s var(--ease);
  }

  .page-about .ab-step:first-child {
    border-left: 0;
  }

  .page-about .ab-step:hover {
    background: var(--ink-3);
  }

  .page-about .ab-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 36px;
    right: -5px;
    width: 8px;
    height: 8px;
    border-top: 2px solid var(--lime);
    border-right: 2px solid var(--lime);
    transform: rotate(45deg);
    z-index: 3;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .ab-team-media {
    grid-column: 1;
  }

  .page-about .ab-team-panel {
    grid-column: 2;
  }

  .page-about .ab-roles {
    grid-column: 1 / -1;
    margin-top: 8px;
  }

  .page-about .ab-facts {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
    gap: 28px;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-flow-head {
    grid-template-columns: minmax(0, 1fr) 340px;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .ab-tl-card,
  .page-about .ab-step,
  .page-about .ab-role {
    transition: none;
  }

  .page-about .ab-tl-item:hover .ab-tl-card,
  .page-about .ab-tl-item:focus-within .ab-tl-card {
    transform: none;
  }
}