.page-about {
  --ab-paper-line: rgba(11, 27, 23, 0.16);
  --ab-line: rgba(30, 58, 49, 0.55);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .ab-crumb .bw-breadcrumb {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .ab-crumb .bw-breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .ab-crumb .bw-breadcrumb a:hover {
  color: var(--lime);
}

.page-about .ab-crumb__now {
  color: var(--text);
}

/* ---------- Hero ---------- */
.page-about .ab-hero {
  padding: clamp(26px, 4.6vw, 56px) 0 clamp(34px, 5.4vw, 72px);
  border-bottom: 1px solid var(--rule);
  position: relative;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: 0;
  top: 12%;
  width: 120px;
  height: 1px;
  background: var(--rule);
  opacity: 0.7;
}

.page-about .ab-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
  align-items: end;
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.4vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.022em;
  color: var(--paper);
  margin: 12px 0 16px;
}

.page-about .ab-hero__lead {
  font-family: var(--font-sans);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--text);
  max-width: 44ch;
  margin: 0 0 22px;
}

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

.page-about .ab-hero__panel {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--radius);
}

.page-about .ab-hero__panel-label {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

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

.page-about .ab-hero__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule-soft);
}

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

.page-about .ab-hero__facts-k {
  font-size: 13px;
  color: var(--muted);
}

.page-about .ab-hero__facts-v {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .ab-hero__facts-v b {
  font-size: 22px;
  font-weight: 700;
  color: var(--lime);
  letter-spacing: -0.02em;
}

/* ---------- 宽幅时间线图 ---------- */
.page-about .ab-band {
  margin: 0;
  position: relative;
  background: var(--ink-2);
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-band__media {
  overflow: hidden;
}

.page-about .ab-band__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1800 / 760;
}

.page-about .ab-band__cap {
  padding: 12px clamp(16px, 4vw, 40px);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-top: 1px solid var(--rule-soft);
}

/* ---------- 章节头 ---------- */
.page-about .ab-head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .ab-head__lede {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: clamp(14px, 1.4vw, 16px);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-track {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 0;
  position: relative;
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .ab-track::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--lime) 0%, var(--gold) 50%, var(--red) 100%);
  opacity: 0.5;
}

.page-about .ab-track__item {
  position: relative;
  padding-left: 46px;
}

.page-about .ab-track__dot {
  position: absolute;
  left: 8px;
  top: 12px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 77, 0.12);
}

.page-about .ab-track__item:nth-child(2) .ab-track__dot {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(228, 180, 91, 0.14);
}

.page-about .ab-track__item:nth-child(3) .ab-track__dot {
  border-color: var(--red);
  box-shadow: 0 0 0 4px rgba(155, 34, 48, 0.2);
}

.page-about .ab-track__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin-bottom: 8px;
}

.page-about .ab-track__item:nth-child(1) .ab-track__year { color: var(--lime); }
.page-about .ab-track__item:nth-child(2) .ab-track__year { color: var(--gold); }
.page-about .ab-track__item:nth-child(3) .ab-track__year { color: #E8707F; }

.page-about .ab-track__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 24px);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-track__text {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(14px, 1.4vw, 15.5px);
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 数据链路 ---------- */
.page-about .ab-flow {
  background: var(--ink-2);
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-flow__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.6vw, 46px);
  align-items: start;
}

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

.page-about .ab-flow__media .bw-figure__media {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-3);
}

.page-about .ab-flow__card {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: clamp(22px, 3.2vw, 36px);
  box-shadow: 0 30px 70px -40px rgba(0, 0, 0, 0.8);
  position: relative;
}

.page-about .ab-flow__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: clamp(22px, 3.2vw, 36px);
  width: 4px;
  height: 46px;
  background: var(--red);
}

.page-about .ab-flow__eyebrow {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #6a7d70;
}

.page-about .ab-flow__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.6vw, 30px);
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .ab-flow__intro {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #35463e;
}

.page-about .ab-flow__steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-flow__step {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(11, 27, 23, 0.05);
  border-left: 3px solid rgba(11, 27, 23, 0.3);
  border-radius: var(--radius-sm);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .ab-flow__step:hover {
  background: rgba(11, 27, 23, 0.09);
}

.page-about .ab-flow__step--key {
  background: rgba(200, 255, 77, 0.34);
  border-left-color: #4f6b17;
}

.page-about .ab-flow__step--key:hover {
  background: rgba(200, 255, 77, 0.46);
}

.page-about .ab-flow__no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  color: #6a7d70;
  line-height: 1.4;
}

.page-about .ab-flow__step--key .ab-flow__no {
  color: #35500a;
}

.page-about .ab-flow__step h3 {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-flow__step p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: #3a4a42;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-team__card {
  padding: 22px 20px;
  border-radius: var(--radius);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .ab-team__card:hover {
  transform: translateY(-3px);
  border-color: rgba(228, 180, 91, 0.4);
}

.page-about .ab-team__count {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  line-height: 1;
}

.page-about .ab-team__count .bw-num {
  font-size: clamp(34px, 4.2vw, 46px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--lime);
}

.page-about .ab-team__role {
  margin: 6px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 栏目与覆盖 ---------- */
.page-about .ab-cover {
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-cover__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
}

.page-about .ab-cover__text {
  margin: 0 0 14px;
  max-width: 54ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .ab-cover__topics {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.page-about .ab-cover__topics li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  color: var(--text);
  padding: 8px 10px;
  background: var(--ink-3);
  border-radius: var(--radius-sm);
}

.page-about .ab-cover__topics-no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--lime);
  letter-spacing: 0.04em;
}

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

.page-about .ab-cover__media .bw-figure__media {
  border-radius: 50%;
  overflow: hidden;
  background: var(--ink-2);
}

/* ---------- 合作伙伴 ---------- */
.page-about .ab-partners {
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-partners__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-partners__item {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--ink-3);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-partners__shape {
  position: absolute;
  right: -18px;
  top: -18px;
  width: 110px;
  height: 110px;
  border-radius: 30% 70% 55% 45% / 45% 40% 60% 55%;
  opacity: 0.22;
}

.page-about .ab-partners__shape--a { background: var(--lime); }
.page-about .ab-partners__shape--b { background: var(--gold); border-radius: 60% 40% 40% 60% / 55% 60% 40% 45%; }
.page-about .ab-partners__shape--c { background: var(--red); border-radius: 45% 55% 70% 30% / 40% 55% 45% 60%; }

.page-about .ab-partners__count {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(32px, 4vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
  position: relative;
}

.page-about .ab-partners__role {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--lime);
  position: relative;
}

.page-about .ab-partners__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text);
  max-width: 32ch;
  position: relative;
}

/* ---------- 数据开放日 ---------- */
.page-about .ab-open {
  padding-bottom: clamp(56px, 7vw, 100px);
}

.page-about .ab-open__inner {
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: clamp(26px, 4vw, 52px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.4vw, 46px);
  align-items: center;
  box-shadow: 0 34px 80px -46px rgba(0, 0, 0, 0.85);
  position: relative;
  overflow: hidden;
}

.page-about .ab-open__inner::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--lime) 0%, var(--gold) 55%, var(--red) 100%);
}

.page-about .ab-open__stamp {
  display: inline-block;
  margin: 0 0 14px;
  padding: 5px 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--paper);
  background: var(--red);
  border-radius: 999px;
}

.page-about .ab-open__copy h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.018em;
  color: var(--ink);
}

.page-about .ab-open__text {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: #35463e;
}

.page-about .ab-open__facts {
  margin: 0;
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .ab-open__facts > div {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ab-paper-line);
}

.page-about .ab-open__facts > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-open__facts dt {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: #6a7d70;
  margin-bottom: 6px;
}

.page-about .ab-open__facts dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .ab-flow__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .ab-cover__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .ab-open__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .ab-track__item {
    padding-left: 56px;
  }

  .page-about .ab-track::before {
    left: 17px;
  }

  .page-about .ab-track__dot {
    left: 10px;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .ab-hero__facts-v b {
    font-size: 19px;
  }

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

  .page-about .ab-flow__step {
    grid-template-columns: 32px 1fr;
    padding: 12px 13px;
  }
}
</main>