.page-about {
  --ab-gap: 16px;
  color: var(--text);
  font-family: var(--font-body);
}

.page-about p {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .02em;
  overflow-wrap: break-word;
}

.page-about h2 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 5.6vw, 40px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: .01em;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

@keyframes ab-fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 首屏 ---------- */
.page-about .ab-intro {
  padding-top: clamp(24px, 5vw, 52px);
  padding-bottom: clamp(40px, 7vw, 72px);
}

.page-about .ab-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .ab-crumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

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

.page-about .ab-crumb__sep {
  color: var(--deco);
}

.page-about .ab-title {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 8.2vw, 64px);
  line-height: 1.06;
  letter-spacing: -.015em;
  color: var(--text);
}

.page-about .ab-title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .ab-lede {
  margin-top: 22px;
  max-width: 36em;
  color: var(--text);
  opacity: .86;
}

.page-about .ab-facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
}

.page-about .ab-facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .ab-facts .bp-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5.4vw, 34px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-facts em {
  font-style: normal;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 起点故事 ---------- */
.page-about .ab-story {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-top: clamp(44px, 7vw, 84px);
  padding-bottom: clamp(44px, 7vw, 84px);
}

.page-about .ab-story__copy > p:not(.bp-eyebrow) {
  margin-top: 16px;
  color: var(--muted);
}

.page-about .ab-story__copy > p:first-of-type {
  color: var(--text);
  opacity: .9;
}

.page-about .ab-checks {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-checks li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  line-height: 1.72;
  letter-spacing: .02em;
  color: var(--muted);
}

.page-about .ab-checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 13px;
  height: 1px;
  background: var(--cyan);
}

.page-about .ab-story__fig {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-700);
}

.page-about .ab-story__fig img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-story__fig figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--muted);
}

/* ---------- 赛季刻度 ---------- */
.page-about .ab-time {
  padding: clamp(40px, 7vw, 72px) 0 clamp(48px, 8vw, 88px);
  background: var(--ink-800);
  border-top: 1px solid var(--line);
}

.page-about .ab-time__lede {
  margin-top: 14px;
  max-width: 34em;
  color: var(--muted);
}

.page-about .ab-years {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-years::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 24px;
  width: 1px;
  background: linear-gradient(to bottom, var(--deco), var(--line) 45%, var(--cyan));
}

.page-about .ab-year {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 0 0 30px 30px;
}

.page-about .ab-year::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink-800);
  box-sizing: border-box;
  transition: background .22s var(--ease), box-shadow .3s var(--ease);
}

.page-about .ab-year:hover::before,
.page-about .ab-year:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(47, 227, 208, .16);
}

.page-about .ab-year__num {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: .04em;
  line-height: 1.2;
  color: var(--deco);
  transition: color .22s var(--ease);
}

.page-about .ab-year:hover .ab-year__num,
.page-about .ab-year:focus-within .ab-year__num {
  color: var(--cyan);
}

.page-about .ab-plate {
  min-width: 0;
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-700);
  transition: border-color .25s var(--ease), transform .3s var(--ease);
}

.page-about .ab-year:hover .ab-plate,
.page-about .ab-year:focus-within .ab-plate {
  border-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .ab-plate h3 {
  margin: 12px 0 8px;
  font-size: 20px;
}

.page-about .ab-plate p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-plate .ab-more {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--deco);
  transition: color .22s var(--ease);
}

.page-about .ab-year:hover .ab-more,
.page-about .ab-year:focus-within .ab-more {
  color: var(--cyan);
}

.page-about .ab-banner {
  margin: 12px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .ab-banner img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding-top: clamp(44px, 7vw, 84px);
  padding-bottom: clamp(44px, 7vw, 84px);
}

.page-about .ab-team__lede {
  margin-top: 16px;
  max-width: 36em;
  color: var(--muted);
}

.page-about .ab-roles {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-role {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-700);
  animation: ab-fade-up .42s var(--ease) both;
  transition: border-color .25s var(--ease);
}

.page-about .ab-role:nth-child(1) { animation-delay: 0ms; }
.page-about .ab-role:nth-child(2) { animation-delay: 60ms; }
.page-about .ab-role:nth-child(3) { animation-delay: 120ms; }
.page-about .ab-role:nth-child(4) { animation-delay: 180ms; }

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

.page-about .ab-role__num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-role h3 {
  font-size: 18px;
}

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

.page-about .ab-role .bp-tag {
  align-self: flex-start;
  margin-top: auto;
}

.page-about .ab-cities {
  margin-top: 20px;
  padding: 18px 20px;
  border: 1px dashed var(--line);
  border-radius: var(--r-md);
  display: grid;
  gap: 8px;
}

.page-about .ab-cities p {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .ab-cities strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- 评测五维 ---------- */
.page-about .ab-score {
  padding: clamp(44px, 7vw, 84px) 0 clamp(48px, 8vw, 88px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(47, 227, 208, .10), transparent 62%),
    var(--ink-900);
}

.page-about .ab-score__lede {
  margin-top: 16px;
  max-width: 38em;
  color: var(--muted);
}

.page-about .ab-score__fig {
  margin: 30px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .ab-score__fig img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .ab-score__fig figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .ab-dims {
  margin-top: 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .ab-dim {
  min-width: 0;
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(18, 48, 73, .74);
  transition: border-color .25s var(--ease), background .25s var(--ease);
}

.page-about .ab-dim:hover {
  border-color: var(--deco);
}

.page-about .ab-dim[open] {
  border-color: var(--cyan);
  background: rgba(18, 48, 73, .95);
}

.page-about .ab-dim summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 8px 10px;
  cursor: pointer;
  list-style: none;
}

.page-about .ab-dim summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-dim__name {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .ab-dim__sign {
  position: relative;
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-left: 7px;
  vertical-align: middle;
}

.page-about .ab-dim__sign::before,
.page-about .ab-dim__sign::after {
  content: "";
  position: absolute;
  background: var(--deco);
  transition: transform .2s var(--ease), background .2s var(--ease);
}

.page-about .ab-dim__sign::before {
  left: 0;
  top: 4px;
  width: 9px;
  height: 1px;
}

.page-about .ab-dim__sign::after {
  left: 4px;
  top: 0;
  width: 1px;
  height: 9px;
}

.page-about .ab-dim[open] .ab-dim__sign::after {
  transform: scaleY(0);
}

.page-about .ab-dim[open] .ab-dim__sign::before,
.page-about .ab-dim[open] .ab-dim__sign::after {
  background: var(--cyan);
}

.page-about .ab-dim__score {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--cyan);
  text-align: right;
}

.page-about .ab-scale {
  grid-column: 1 / -1;
  display: flex;
  gap: 3px;
}

.page-about .ab-scale i {
  display: block;
  flex: 1 1 0;
  height: 5px;
  border-radius: var(--r-pill);
  background: var(--line);
}

.page-about .ab-scale i.is-on {
  background: var(--cyan);
}

.page-about .ab-dim p {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 协作生态 ---------- */
.page-about .ab-eco {
  padding-top: clamp(44px, 7vw, 84px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.page-about .ab-eco__lede {
  margin-top: 16px;
  max-width: 36em;
  color: var(--muted);
}

.page-about .ab-eco__map {
  margin-top: 32px;
  display: grid;
  gap: 18px;
}

.page-about .ab-eco__hub {
  justify-self: center;
  padding: 13px 26px;
  border: 1px solid var(--cyan);
  border-radius: var(--r-pill);
  background: rgba(47, 227, 208, .08);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .05em;
  color: var(--cyan);
  text-align: center;
}

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

.page-about .ab-node {
  position: relative;
  min-width: 0;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-700);
  transition: border-color .25s var(--ease), transform .3s var(--ease);
}

.page-about .ab-node:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .ab-node__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-node h3 {
  margin: 10px 0 8px;
  font-size: 17px;
}

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

/* ---------- 里程碑 ---------- */
.page-about .ab-miles {
  padding-bottom: clamp(44px, 7vw, 84px);
}

.page-about .ab-mile {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
}

.page-about .ab-mile li {
  position: relative;
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 22px;
}

.page-about .ab-mile li::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 16px;
  bottom: 0;
  border-left: 1px dotted var(--line);
}

.page-about .ab-mile li:last-child::before {
  display: none;
}

.page-about .ab-mile__dot {
  width: 7px;
  height: 7px;
  margin: 8px 0 0 5px;
  border-radius: 50%;
  background: var(--deco);
}

.page-about .ab-mile li:nth-child(4) .ab-mile__dot {
  background: #6E97AC;
}

.page-about .ab-mile li:nth-child(n+5) .ab-mile__dot {
  background: var(--cyan);
}

.page-about .ab-mile h3 {
  font-size: 16px;
  color: var(--text);
}

.page-about .ab-mile p {
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .ab-honor {
  margin-top: 8px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--coral);
  border-radius: var(--r-md);
  background: var(--ink-700);
  display: grid;
  gap: 10px;
  justify-items: start;
}

.page-about .ab-honor p {
  font-size: 15px;
  line-height: 1.72;
  color: var(--text);
}

/* ---------- 下一页 ---------- */
.page-about .ab-next {
  padding-top: clamp(32px, 5vw, 56px);
  padding-bottom: clamp(48px, 8vw, 88px);
}

.page-about .ab-next__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .ab-next__list li {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-800);
  transition: border-color .25s var(--ease), transform .3s var(--ease);
}

.page-about .ab-next__list li:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .ab-next__list a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text);
}

.page-about .ab-next__list a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--r-md);
}

.page-about .ab-next__list span {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .ab-next__list em {
  font-style: normal;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

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

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

  .page-about .ab-cities {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px 24px;
    align-items: baseline;
  }

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

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

  .page-about .ab-node::before {
    content: "";
    position: absolute;
    left: 50%;
    top: -14px;
    width: 1px;
    height: 14px;
    background: var(--line);
  }

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

@media (min-width: 900px) {
  .page-about .ab-story {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-story__fig {
    margin-top: 52px;
  }

  .page-about .ab-year {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
    padding-bottom: 44px;
  }

  .page-about .ab-year__num {
    font-size: 30px;
    padding-top: 12px;
  }

  .page-about .ab-plate {
    padding: 24px 26px;
  }

  .page-about .ab-score__lede {
    max-width: 40em;
  }
}

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

  .page-about .ab-dims {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }
}