/* ===== 发展历程 /about ===== */
.page-about {
  --ab-line-violet: rgba(139, 92, 246, 0.35);
  --ab-bar-track: #141826;
  color: var(--mist-100);
}

.page-about .ab-sec {
  padding: clamp(42px, 6vw, 84px) 0;
  border-bottom: var(--bd);
  scroll-margin-top: 96px;
}

.page-about .ab-sec:last-of-type {
  border-bottom: 0;
}

.page-about .plate {
  display: inline-block;
  margin-bottom: 14px;
}

.page-about .ab-sec h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.28;
  color: #fff;
  margin: 0 0 16px;
  max-width: 30ch;
}

.page-about .ab-lead {
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--mist-100);
  max-width: 68ch;
  margin: 0 0 clamp(20px, 3vw, 34px);
}

.page-about .ab-sec p {
  line-height: 1.8;
}

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

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 46px) 0 clamp(38px, 5.5vw, 70px);
  border-bottom: var(--bd);
  background:
    radial-gradient(760px 420px at 8% -12%, rgba(139, 92, 246, 0.26), transparent 64%),
    radial-gradient(620px 380px at 96% 10%, rgba(34, 211, 238, 0.18), transparent 62%),
    radial-gradient(520px 320px at 58% 118%, rgba(244, 114, 182, 0.16), transparent 66%);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-kicker {
  font-family: var(--font-label);
  font-weight: 900;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--neon-cyan);
  margin: 0 0 14px;
  text-shadow: 0 0 14px rgba(34, 211, 238, 0.55);
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(29px, 5.2vw, 50px);
  line-height: 1.2;
  color: #fff;
  margin: 0 0 20px;
  max-width: 18ch;
  text-shadow: 0 0 26px rgba(139, 92, 246, 0.42);
}

.page-about .ab-hero__text {
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.82;
  color: var(--mist-100);
  max-width: 58ch;
  margin: 0;
}

.page-about .ab-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-steel);
  border: var(--bd);
}

.page-about .ab-stats li {
  background: var(--night-900);
  padding: 14px 16px;
  border-top: 2px solid transparent;
}

.page-about .ab-stats li:nth-child(1) { border-top-color: var(--neon-violet); }
.page-about .ab-stats li:nth-child(2) { border-top-color: var(--neon-cyan); }
.page-about .ab-stats li:nth-child(3) { border-top-color: var(--candy-pink); }
.page-about .ab-stats li:nth-child(4) { border-top-color: var(--glow-lime); }

.page-about .ab-stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1.1;
  color: var(--glow-lime);
}

.page-about .ab-stats__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist-400);
}

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

.page-about .ab-hero__visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 240px;
  padding: 18px;
  border: var(--bd);
  background: linear-gradient(160deg, rgba(139, 92, 246, 0.16), rgba(5, 6, 11, 0.92) 58%);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-hero__svg {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
  filter: drop-shadow(0 0 12px rgba(34, 211, 238, 0.35));
}

.page-about .ab-hero__stamp {
  position: absolute;
  right: 14px;
  bottom: 12px;
  font-family: var(--font-label);
  font-weight: 900;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--night-950);
  background: var(--glow-lime);
  padding: 5px 10px;
  border-radius: var(--radius);
}

/* ---------- 起点 ---------- */
.page-about .ab-open__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.page-about .ab-open__text p {
  margin: 0 0 14px;
  font-size: 16px;
  color: var(--mist-100);
  max-width: 62ch;
}

.page-about .ab-facts {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-steel);
  border: var(--bd);
}

.page-about .ab-facts li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  background: var(--night-900);
  padding: 12px 14px;
}

.page-about .ab-facts__k {
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist-400);
}

.page-about .ab-facts__v {
  font-size: 16px;
  color: #fff;
}

.page-about .ab-facts__v.num {
  font-family: var(--font-mono);
  color: var(--glow-lime);
}

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

.page-about .ab-rail {
  border: var(--bd);
  background: var(--night-900);
  padding: 10px;
}

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

.page-about .ab-rail li {
  flex: 0 0 auto;
}

.page-about .ab-rail a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line-steel);
  color: var(--mist-400);
  font-family: var(--font-label);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-rail a:hover,
.page-about .ab-rail a:focus-visible {
  color: #fff;
  border-color: var(--neon-cyan);
  background: rgba(34, 211, 238, 0.1);
}

.page-about .ab-rail__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--neon-cyan);
}

.page-about .ab-line {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .ab-line::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon-violet), var(--neon-cyan) 45%, var(--candy-pink) 80%, var(--glow-lime));
  opacity: 0.8;
}

.page-about .ab-line__item {
  position: relative;
  padding-bottom: clamp(24px, 3vw, 38px);
  scroll-margin-top: 110px;
}

.page-about .ab-line__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 7px;
  width: 12px;
  height: 12px;
  background: var(--night-950);
  border: 2px solid var(--neon-cyan);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.7);
}

.page-about .ab-line__season {
  font-family: var(--font-label);
  font-weight: 900;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--neon-cyan);
}

.page-about .ab-line__item h3 {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.35;
  color: #fff;
  margin: 6px 0 8px;
}

.page-about .ab-line__item p {
  margin: 0 0 10px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--mist-400);
  max-width: 62ch;
}

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

.page-about .ab-line__meta li {
  font-size: 13px;
  color: var(--mist-100);
  background: var(--night-800);
  border: 1px solid var(--line-steel);
  border-radius: var(--radius);
  padding: 4px 10px;
}

.page-about .ab-line__meta .num {
  font-family: var(--font-mono);
  color: var(--glow-lime);
}

/* ---------- 版本档案 ---------- */
.page-about .ab-versions {
  border: var(--bd);
  background: var(--night-900);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-versions__scroll {
  overflow-x: auto;
}

.page-about .ab-versions__caption {
  text-align: left;
  padding: 14px 16px;
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist-400);
  border-bottom: 1px solid var(--line-steel);
}

.page-about .ab-versions table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

.page-about .ab-versions thead th {
  background: var(--night-800);
  font-family: var(--font-label);
  font-weight: 900;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--neon-cyan);
  text-align: left;
  padding: 12px 14px;
  border-bottom: var(--bd);
  white-space: nowrap;
}

.page-about .ab-versions tbody th,
.page-about .ab-versions tbody td {
  padding: 14px;
  font-size: 14.5px;
  font-weight: 400;
  line-height: 1.7;
  text-align: left;
  vertical-align: top;
  color: var(--mist-100);
  border-bottom: 1px solid var(--line-steel);
}

.page-about .ab-versions tbody tr:last-child th,
.page-about .ab-versions tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .ab-versions tbody th {
  font-family: var(--font-mono);
  color: #fff;
  white-space: nowrap;
}

.page-about .ab-versions tr.is-current {
  background: linear-gradient(90deg, rgba(34, 211, 238, 0.14), transparent 72%);
}

.page-about .ab-versions tr.is-current th {
  color: var(--neon-cyan);
}

.page-about .ab-versions details {
  margin-top: 2px;
}

.page-about .ab-versions summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-label);
  font-size: 13px;
  color: var(--neon-violet);
  transition: color var(--dur) var(--ease);
}

.page-about .ab-versions summary:hover,
.page-about .ab-versions summary:focus-visible {
  color: var(--candy-pink);
}

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

.page-about .ab-versions summary::before {
  content: "▸ ";
}

.page-about .ab-versions details[open] > summary::before {
  content: "▾ ";
}

.page-about .ab-versions details ul {
  margin: 8px 0 0;
  padding-left: 18px;
}

.page-about .ab-versions details li {
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist-400);
}

/* ---------- 场地与规模 ---------- */
.page-about .ab-scale__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

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

.page-about .ab-cover li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .ab-cover__city {
  flex: 0 0 auto;
  min-width: 9em;
  font-family: var(--font-label);
  font-size: 14px;
  color: var(--mist-100);
}

.page-about .ab-cover__bar {
  flex: 1 1 120px;
  min-width: 80px;
  height: 10px;
  background: var(--ab-bar-track);
  border: 1px solid var(--line-steel);
  overflow: hidden;
}

.page-about .ab-cover__bar i {
  display: block;
  height: 100%;
  width: 46%;
  background: linear-gradient(90deg, var(--neon-violet), var(--neon-cyan));
}

.page-about .ab-cover li:nth-child(1) .ab-cover__bar i {
  width: 100%;
  background: linear-gradient(90deg, var(--neon-cyan), var(--glow-lime));
}

.page-about .ab-cover li:nth-child(2) .ab-cover__bar i {
  width: 64%;
}

.page-about .ab-cover__val {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--glow-lime);
  white-space: nowrap;
}

.page-about .ab-scale__figs {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-steel);
  border: var(--bd);
}

.page-about .ab-scale__figs li {
  background: var(--night-900);
  padding: 14px 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist-400);
}

.page-about .ab-scale__figs .num {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--glow-lime);
  margin-right: 8px;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

.page-about .ab-team__text p {
  margin: 0 0 14px;
  font-size: 16px;
  color: var(--mist-100);
  max-width: 62ch;
}

.page-about .ab-team__stats {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-steel);
  border: var(--bd);
}

.page-about .ab-team__stats li {
  background: var(--night-900);
  padding: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-400);
}

.page-about .ab-team__stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.15;
  color: var(--neon-cyan);
  margin-bottom: 6px;
}

/* ---------- 案例合集 ---------- */
.page-about .ab-cases__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-steel);
  border: var(--bd);
}

.page-about .ab-region {
  background: var(--night-900);
  padding: 20px 18px;
  border-top: 3px solid var(--neon-violet);
}

.page-about .ab-region:nth-child(2) {
  border-top-color: var(--neon-cyan);
}

.page-about .ab-region:nth-child(3) {
  border-top-color: var(--candy-pink);
}

.page-about .ab-region h3 {
  font-family: var(--font-label);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: 0.1em;
  color: #fff;
  margin: 0 0 10px;
}

.page-about .ab-region p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-400);
}

.page-about .ab-cases__note {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-100);
  max-width: 68ch;
}

.page-about .ab-cases__note a {
  color: var(--neon-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 未来十二个月 ---------- */
.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-next__card {
  position: relative;
  padding: 20px 18px 24px;
  border: var(--bd);
  background: var(--night-800);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-next__card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.35;
  color: #fff;
  margin: 0 0 10px;
}

.page-about .ab-next__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist-400);
}

.page-about .ab-next__card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--neon-violet), var(--neon-cyan));
}

.page-about .ab-next__card:nth-child(2)::after {
  background: linear-gradient(90deg, var(--neon-cyan), var(--glow-lime));
}

.page-about .ab-next__card:nth-child(3)::after {
  background: linear-gradient(90deg, var(--candy-pink), var(--neon-violet));
}

/* ---------- 指路 ---------- */
.page-about .ab-paths .index-map {
  margin-top: 22px;
}

.page-about .ab-paths__meta {
  margin: 22px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist-400);
  border-left: 3px solid var(--neon-violet);
  padding-left: 12px;
}

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

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

@media (min-width: 780px) {
  .page-about .ab-cases__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .ab-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-open__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

  .page-about .ab-scale__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }

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

@media (min-width: 980px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1024px) {
  .page-about .ab-timeline__grid {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .ab-rail ol {
    display: block;
    overflow: visible;
  }

  .page-about .ab-rail li + li {
    margin-top: 6px;
  }

  .page-about .ab-rail a {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .page-about .ab-cover li {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .ab-cover__bar {
    width: 100%;
    flex: 0 0 auto;
  }

  .page-about .ab-hero__stamp {
    right: 10px;
    bottom: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail a,
  .page-about .ab-versions summary {
    transition: none;
  }
}
<<<END>>>