.page-about {
  background: var(--void);
  color: var(--silver);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- 封面 ---------- */
.page-about .ab-cover {
  position: relative;
  padding: calc(var(--header-h) + 48px) 0 0;
  background:
    radial-gradient(900px 520px at 76% -10%, rgba(47, 227, 206, 0.16), transparent 64%),
    radial-gradient(620px 420px at 4% 24%, rgba(255, 90, 54, 0.08), transparent 68%),
    linear-gradient(180deg, var(--night) 0%, var(--void) 100%);
  overflow: hidden;
}

.page-about .ab-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(47, 227, 206, 0.055) 0 1px, transparent 1px 112px);
  pointer-events: none;
}

.page-about .ab-cover-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
}

.page-about .ab-cover .breadcrumb {
  margin-bottom: 22px;
  font-size: 13px;
}

.page-about .ab-cover-main .kicker {
  margin: 0;
}

.page-about .ab-cover h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 5.4vw, 58px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--silver);
  margin: 14px 0 0;
  max-width: 16ch;
}

.page-about .ab-cover-lead {
  margin: 20px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: #c3d1e4;
}

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

.page-about .ab-cover-side {
  border: 1px solid var(--line);
  background: rgba(20, 36, 62, 0.72);
  padding: 20px 20px 4px;
}

.page-about .ab-side-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

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

.page-about .ab-side-list li {
  padding: 13px 0 14px;
  border-top: 1px solid var(--line);
}

.page-about .ab-side-list a {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--silver);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

.page-about .ab-side-list a:hover,
.page-about .ab-side-list a:focus-visible {
  color: var(--cyan);
}

.page-about .ab-side-list span {
  display: block;
  margin-top: 5px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-cover-stats {
  position: relative;
  list-style: none;
  margin: clamp(38px, 6vw, 74px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .ab-cover-stats li {
  background: var(--void);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .ab-st-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-st-key {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 章节导航 ---------- */
.page-about .ab-toc {
  position: sticky;
  top: var(--header-h);
  z-index: 20;
  background: rgba(7, 14, 28, 0.94);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.page-about .ab-toc-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 11px 0;
}

.page-about .ab-toc-title {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .ab-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-toc-list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-toc-link {
  display: block;
  white-space: nowrap;
  padding: 6px 12px;
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .ab-toc-link:hover,
.page-about .ab-toc-link:focus-visible {
  color: var(--silver);
  border-color: var(--cyan-deep);
}

.page-about .ab-toc-link[aria-current="true"] {
  color: var(--night);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 700;
}

/* ---------- 通用章节 ---------- */
.page-about .ab-sec {
  padding: clamp(56px, 9vw, 108px) 0;
}

.page-about .ab-sec--board {
  background: linear-gradient(180deg, rgba(20, 36, 62, 0.55) 0%, rgba(12, 24, 48, 0) 100%);
}

.page-about .ab-sec-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .ab-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4.5vw, 52px);
}

.page-about .ab-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 3.6vw, 38px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--silver);
  margin: 12px 0 0;
}

.page-about .ab-h3 {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.35;
  color: var(--silver);
  margin: 0 0 8px;
}

.page-about .ab-sec-sub {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .ab-sec-lead .kicker,
.page-about .ab-sec-head .kicker {
  margin: 0;
}

.page-about .ab-sec-body p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
  color: #c3d1e4;
  max-width: 62ch;
}

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

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

.page-about .ab-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
}

.page-about .ab-fig .media-cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: 0 0 clamp(32px, 5vw, 56px);
  padding: 0;
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-deep) 34%, var(--line) 88%);
}

.page-about .ab-tl-item {
  position: relative;
  padding: 0 0 36px 38px;
}

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

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 6px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--void);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 227, 206, 0.12);
}

.page-about .ab-tl-year {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-tl-year em {
  font-style: normal;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
  border: 1px solid var(--line);
  padding: 3px 8px;
}

.page-about .ab-tl-body {
  margin-top: 12px;
}

.page-about .ab-tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #c3d1e4;
  max-width: 58ch;
}

/* ---------- 数据指标 ---------- */
.page-about .ab-metrics {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 46px);
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-metrics li {
  background: var(--board);
  padding: 22px 18px 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 5px 7px;
  transition: background var(--t-mid) var(--ease);
}

.page-about .ab-metrics li:hover {
  background: #172944;
}

.page-about .ab-m-val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-m-unit {
  font-size: 14px;
  color: var(--mist);
}

.page-about .ab-m-key {
  flex: 1 0 100%;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-output-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .ab-note {
  padding: 20px 20px 22px;
  border-left: 2px solid var(--cyan-deep);
}

.page-about .ab-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #c3d1e4;
}

/* ---------- 数据链路 ---------- */
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-steps li {
  position: relative;
  padding: 0 0 24px 0;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}

.page-about .ab-steps li:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--flare);
  margin-bottom: 8px;
}

.page-about .ab-steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #c3d1e4;
  max-width: 58ch;
}

/* ---------- 团队 ---------- */
.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-team-copy .kicker {
  margin: 0;
}

.page-about .ab-team-copy p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: #c3d1e4;
  max-width: 60ch;
}

.page-about .ab-tags {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-fig--team {
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .ab-eco-card {
  padding: 22px 20px 24px;
}

.page-about .ab-eco-card .card-body {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #c3d1e4;
}

.page-about .ab-eco-card .card-meta {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

/* ---------- 结尾行动区 ---------- */
.page-about .ab-cta {
  padding: clamp(52px, 8vw, 92px) 0;
  background:
    radial-gradient(700px 380px at 82% 0%, rgba(255, 90, 54, 0.14), transparent 66%),
    linear-gradient(180deg, var(--night) 0%, #050A15 100%);
  border-top: 1px solid var(--line);
}

.page-about .ab-cta-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: end;
}

.page-about .ab-h2--cta {
  margin-top: 0;
  max-width: 22ch;
}

.page-about .ab-cta-inner p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
  max-width: 52ch;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-cover-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .ab-tl-item {
    display: grid;
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 26px;
    padding-left: 46px;
    padding-bottom: 42px;
  }

  .page-about .ab-tl-year {
    justify-content: flex-start;
  }

  .page-about .ab-tl-body {
    margin-top: 2px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-cover-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(250px, 0.85fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .ab-sec-grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: clamp(40px, 6vw, 86px);
  }

  .page-about .ab-sec-grid--flip .ab-sec-lead {
    order: 1;
  }

  .page-about .ab-sec-grid--flip .ab-sec-body {
    order: 2;
  }

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

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(34px, 5vw, 68px);
  }

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

  .page-about .ab-cta-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, auto);
    gap: 40px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-cover-side {
    margin-bottom: 8px;
  }
}
</style>