.page-about {
  --about-rule: rgba(243, 231, 207, 0.16);
  --about-tl-year: 2.9rem;
  --about-tl-gap: 0.55rem;
  --about-tl-mark: 0.85rem;
  background: var(--ink);
  color: var(--cream);
}

.page-about .section {
  padding-block: clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-head {
  max-width: 46rem;
}

.page-about .about-head .eyebrow {
  margin: 0;
}

.page-about .about-h2 {
  margin: 0.6rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .about-sub {
  margin: 1rem 0 0;
  max-width: 42rem;
  font-size: var(--step-0);
  line-height: 1.85;
  color: var(--sage);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--cream-line);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.72) contrast(1.06);
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(90% 70% at 78% 8%, rgba(25, 245, 194, 0.17), transparent 62%),
    linear-gradient(180deg, rgba(7, 28, 22, 0.5), rgba(7, 28, 22, 0.95) 72%),
    repeating-linear-gradient(90deg, rgba(61, 90, 80, 0.3) 0 1px, transparent 1px 72px);
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  padding-block: clamp(1.6rem, 5vw, 2.75rem) clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--sage);
  letter-spacing: 0.02em;
}

.page-about .breadcrumb a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan-line);
}

.page-about .breadcrumb__sep {
  color: var(--grid);
}

.page-about .about-hero__title {
  margin: 0.9rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 8.4vw, 5rem);
  line-height: 0.96;
  letter-spacing: -0.035em;
  color: var(--cream);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--cyan);
  text-shadow: 0 0 34px rgba(25, 245, 194, 0.26);
}

.page-about .about-hero__lede {
  margin: 1.2rem 0 0;
  max-width: 36rem;
  font-size: var(--step-0);
  line-height: 1.85;
  color: rgba(243, 231, 207, 0.82);
}

.page-about .about-hero__index {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 1.1rem 0 0;
  display: grid;
  gap: 0.55rem 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  border-top: 1px solid var(--about-rule);
}

.page-about .about-hero__index li {
  position: relative;
  padding-left: 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--sage);
}

.page-about .about-hero__index li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.38rem;
  height: 0.38rem;
  background: var(--amber);
}

.page-about .about-hero__index span {
  display: block;
  margin-bottom: 0.1rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .about-hero__card {
  position: relative;
  padding: 1.35rem 1.25rem 1.5rem;
  background: linear-gradient(158deg, rgba(14, 46, 36, 0.97), rgba(7, 28, 22, 0.92));
  border: 1px solid var(--cyan-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2rem), calc(100% - 2rem) 100%, 0 100%);
}

.page-about .about-hero__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3.4rem;
  height: 2px;
  background: var(--amber);
}

.page-about .about-hero__card-label {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-hero__stats {
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-hero__stats > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed rgba(61, 90, 80, 0.62);
}

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

.page-about .about-hero__stats dt {
  font-size: var(--step--1);
  color: var(--sage);
}

.page-about .about-hero__stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--cream);
  white-space: nowrap;
}

.page-about .about-hero__num {
  margin-right: 0.15rem;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-hero__card-note {
  margin: 1.1rem 0 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--sage);
}

.page-about .about-hero__card-note::before {
  content: "";
  flex: none;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(25, 245, 194, 0.16);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-chron {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: linear-gradient(180deg, var(--ink), #061712);
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: calc(var(--about-tl-year) + var(--about-tl-gap) + var(--about-tl-mark) / 2);
  top: 0.7rem;
  bottom: 0.7rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-line), rgba(255, 180, 58, 0.45), rgba(61, 90, 80, 0));
}

.page-about .tl__item + .tl__item {
  margin-top: 0.3rem;
}

.page-about .tl__summary {
  display: grid;
  grid-template-columns: var(--about-tl-year) var(--about-tl-mark) minmax(0, 1fr);
  align-items: center;
  column-gap: var(--about-tl-gap);
  padding: 0.85rem 0.4rem 0.85rem 0;
  list-style: none;
  cursor: pointer;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about .tl__summary::-webkit-details-marker {
  display: none;
}

.page-about .tl__summary:hover,
.page-about .tl__summary:focus-visible {
  border-bottom-color: var(--cyan-line);
}

.page-about .tl__summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 4.6vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  text-align: right;
  color: var(--amber);
}

.page-about .tl__marker {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  justify-self: center;
  background: var(--brown);
  border: 2px solid var(--amber);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl__summary:hover .tl__marker,
.page-about .tl__node[open] .tl__marker {
  background: var(--cyan);
  border-color: var(--mint);
  box-shadow: 0 0 0 4px rgba(25, 245, 194, 0.18);
}

.page-about .tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.8rem;
}

.page-about .tl__stage {
  font-size: var(--step-1);
  font-weight: 700;
  line-height: 1.35;
  color: var(--cream);
}

.page-about .tl__hint {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1;
  color: var(--sage);
  border: 1px solid rgba(143, 184, 168, 0.4);
  padding: 0.2rem 0.35rem;
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tl__node[open] .tl__hint {
  transform: rotate(45deg);
  color: var(--cyan);
  border-color: var(--cyan-line);
}

.page-about .tl__body {
  padding: 0.15rem 0 1.1rem calc(var(--about-tl-year) + var(--about-tl-gap) * 2 + var(--about-tl-mark));
}

.page-about .tl__body p {
  margin: 0;
  max-width: 44rem;
  font-size: var(--step-0);
  line-height: 1.85;
  color: rgba(243, 231, 207, 0.8);
}

.page-about .about-chron__note {
  max-width: 46rem;
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  padding: 1rem 1.15rem;
  border-left: 2px solid var(--amber);
  background: rgba(255, 180, 58, 0.07);
  font-size: var(--step--1);
  line-height: 1.85;
  color: rgba(243, 231, 207, 0.85);
}

/* ---------- 服务版图 ---------- */
.page-about .about-map {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: var(--panel);
  border-block: 1px solid var(--cream-line);
}

.page-about .about-map__grid {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-map__sports {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.page-about .about-map__sports li {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.04em;
  color: var(--mint);
  border: 1px solid rgba(25, 245, 194, 0.28);
  background: rgba(25, 245, 194, 0.06);
  padding: 0.3rem 0.6rem;
}

.page-about .about-map__facts {
  margin: 1.6rem 0 0;
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
  background: var(--grid-faint);
  border: 1px solid var(--grid-faint);
}

.page-about .about-map__facts > div {
  padding: 0.9rem 0.8rem;
  background: var(--panel);
}

.page-about .about-map__facts b {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-map__facts span {
  display: block;
  margin-top: 0.3rem;
  font-size: var(--step--1);
  line-height: 1.5;
  color: var(--sage);
}

.page-about .about-map__figure {
  margin: 0;
  border: 1px solid var(--grid-soft);
}

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

.page-about .about-map__figure .media__caption {
  padding: 0.7rem 0.85rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--sage);
  background: rgba(7, 28, 22, 0.65);
  border-top: 1px solid var(--grid-soft);
}

/* ---------- 团队与流程 ---------- */
.page-about .about-team {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: var(--ink);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
}

.page-about .about-team__role {
  position: relative;
  padding: 1rem 1rem 1.1rem;
  background: rgba(14, 46, 36, 0.55);
  border: 1px solid rgba(61, 90, 80, 0.55);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-team__role:hover,
.page-about .about-team__role:focus {
  border-color: var(--cyan);
  background: rgba(25, 245, 194, 0.07);
  transform: translateY(-2px);
}

.page-about .about-team__role:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-team__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-team__count span {
  margin-left: 0.15rem;
  font-size: 0.68rem;
  font-weight: 400;
  color: var(--sage);
}

.page-about .about-team__name {
  margin: 0.5rem 0 0;
  font-size: var(--step-0);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cream);
}

.page-about .about-team__duty {
  margin: 0.45rem 0 0;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--sage);
  transition: color var(--dur) var(--ease);
}

.page-about .about-team__role:hover .about-team__duty,
.page-about .about-team__role:focus .about-team__duty {
  color: var(--mint);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--grid-soft);
}

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

.page-about .about-team__figure .media__caption {
  padding: 0.7rem 0.85rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  line-height: 1.6;
  color: var(--sage);
  background: rgba(7, 28, 22, 0.65);
  border-top: 1px solid var(--grid-soft);
}

.page-about .about-team__flow {
  list-style: none;
  counter-reset: flow;
  margin: clamp(1.75rem, 4vw, 2.5rem) 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}

.page-about .about-team__flow li {
  counter-increment: flow;
  position: relative;
  padding: 1.1rem 1.1rem 1.15rem 3.1rem;
  border-top: 1px solid var(--cyan-line);
  background: linear-gradient(180deg, rgba(25, 245, 194, 0.07), rgba(25, 245, 194, 0));
}

.page-about .about-team__flow li::before {
  content: "0" counter(flow);
  position: absolute;
  left: 1rem;
  top: 1.05rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .about-team__flow strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: var(--step-0);
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-team__flow p {
  margin: 0;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  position: relative;
  overflow: hidden;
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: linear-gradient(160deg, #08201A, #0A2A21 60%, #071C16);
}

.page-about .about-eco::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(circle, rgba(61, 90, 80, 0.6) 1px, transparent 1.2px);
  background-size: 22px 22px;
  opacity: 0.55;
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 22%, #000 78%, transparent);
  mask-image: linear-gradient(180deg, transparent, #000 22%, #000 78%, transparent);
}

.page-about .about-eco .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-eco__grid {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
}

.page-about .about-eco__card {
  position: relative;
  padding: 1.2rem 1.15rem 1.3rem;
  background: rgba(14, 46, 36, 0.88);
  border: 1px solid rgba(61, 90, 80, 0.6);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-eco__card::after {
  content: "";
  position: absolute;
  left: 1.15rem;
  right: 1.15rem;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.page-about .about-eco__card:hover {
  border-color: var(--cyan-line);
  background: rgba(14, 46, 36, 0.98);
  transform: translateY(-3px);
}

.page-about .about-eco__card:hover::after {
  transform: scaleX(1);
}

.page-about .about-eco__tag {
  display: inline-block;
  margin-bottom: 0.85rem;
  padding: 0.18rem 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--amber);
  border: 1px solid rgba(255, 180, 58, 0.45);
}

.page-about .about-eco__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 6vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cream);
}

.page-about .about-eco__num--year {
  color: var(--amber);
}

.page-about .about-eco__num span {
  margin-left: 0.2rem;
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--sage);
}

.page-about .about-eco__card p:last-child {
  margin: 0.7rem 0 0;
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--sage);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise {
  padding-block: clamp(3rem, 7vw, 5.5rem);
  background: linear-gradient(120deg, #0A211A 0%, var(--panel) 52%, #123A2E 100%);
  border-top: 1px solid var(--cream-line);
}

.page-about .about-promise__inner {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-promise p {
  max-width: 40rem;
  margin: 1rem 0 0;
  font-size: var(--step-0);
  line-height: 1.85;
  color: rgba(243, 231, 207, 0.82);
}

.page-about .about-promise__links {
  display: grid;
  gap: 0.5rem;
  align-content: end;
}

.page-about .about-promise__links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-decoration: none;
  color: var(--cream);
  background: rgba(7, 28, 22, 0.45);
  border: 1px solid rgba(243, 231, 207, 0.22);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-promise__links a::after {
  content: "→";
  flex: none;
  color: var(--cyan);
}

.page-about .about-promise__links a:hover {
  border-color: var(--cyan);
  background: rgba(25, 245, 194, 0.08);
  color: var(--mint);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about {
    --about-tl-year: 4rem;
    --about-tl-gap: 0.8rem;
    --about-tl-mark: 1rem;
  }

  .page-about .about-hero__title {
    font-size: clamp(3rem, 7.6vw, 5rem);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(15rem, 0.7fr);
    align-items: start;
    column-gap: clamp(1.5rem, 4vw, 3.5rem);
  }

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

  .page-about .about-map__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-promise__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.7fr);
    align-items: end;
  }

  .page-about .about-hero__lede {
    max-width: 38rem;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    font-size: 5.4rem;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__role,
  .page-about .about-eco__card,
  .page-about .about-promise__links a,
  .page-about .tl__marker,
  .page-about .tl__hint,
  .page-about .about-eco__card::after {
    transition: none;
  }

  .page-about .about-team__role:hover,
  .page-about .about-team__role:focus,
  .page-about .about-eco__card:hover {
    transform: none;
  }
}
<<<END>>>