.page-about {
  --about-pad: clamp(44px, 6.5vw, 96px);
  --about-line: rgba(168, 162, 154, 0.42);
  --about-line-soft: rgba(168, 162, 154, 0.22);
  --about-ink: #1B2A38;
  background: var(--night);
  color: var(--fog);
  overflow-x: hidden;
}

/* ---------- 通用排版 ---------- */
.page-about .about-h2 {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 46px);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: inherit;
}

.page-about .about-head {
  margin-bottom: clamp(26px, 4vw, 48px);
  border-bottom: 1px solid var(--about-line-soft);
  padding-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-head__note {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.75;
  opacity: 0.74;
}

.page-about .eyebrow {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.66;
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(84px, 11vw, 124px) 0 var(--about-pad);
  background:
    radial-gradient(115% 78% at 10% 0%, rgba(62, 124, 177, 0.26), transparent 58%),
    linear-gradient(180deg, var(--night) 0%, var(--slate) 100%);
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(26px, 4vw, 46px);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.7;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-size: clamp(36px, 6.4vw, 80px);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: 0.005em;
  color: var(--fog);
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 58ch;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(247, 245, 241, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 26px 26px 6px 26px;
  filter: saturate(0.85) contrast(1.06);
}

.page-about .about-hero__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 245, 241, 0.56);
  border-left: 2px solid var(--amber);
  padding-left: 10px;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  background: var(--concrete);
  color: var(--about-ink);
  padding: var(--about-pad) 0;
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-origin__p {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(27, 42, 56, 0.86);
}

.page-about .about-origin__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(27, 42, 56, 0.16);
  border-top: 1px solid rgba(27, 42, 56, 0.16);
}

.page-about .about-stat {
  background: var(--concrete);
  padding: 20px 14px 22px;
  min-width: 0;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--about-ink);
  text-decoration: underline;
  text-decoration-color: var(--amber-deep);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(27, 42, 56, 0.72);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: var(--night);
  padding: var(--about-pad) 0;
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--about-line);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 36px;
  padding-bottom: clamp(28px, 3.4vw, 44px);
  min-width: 0;
}

.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl__node {
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--night);
}

.page-about .about-tl__stage {
  margin: 0 0 6px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-tl__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 400;
  line-height: 1.3;
  color: var(--fog);
}

.page-about .about-tl__text {
  margin: 0 0 12px;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(247, 245, 241, 0.76);
}

.page-about .about-tl__foot {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 245, 241, 0.56);
}

/* ---------- 大字节奏区 ---------- */
.page-about .about-pulse {
  background: var(--slate);
  padding: clamp(50px, 8vw, 104px) 0;
  border-top: 1px solid var(--about-line-soft);
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-pulse__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-pulse__block {
  min-width: 0;
}

.page-about .about-pulse__figure {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(52px, 8.4vw, 104px);
  line-height: 0.96;
  letter-spacing: -0.03em;
  color: var(--amber);
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-pulse__unit {
  font-family: var(--font-display);
  font-size: clamp(16px, 2vw, 22px);
  letter-spacing: 0.06em;
  color: rgba(247, 245, 241, 0.7);
}

.page-about .about-pulse__label {
  margin: 16px 0 0;
  max-width: 30ch;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(247, 245, 241, 0.72);
}

/* ---------- 赛区网络 ---------- */
.page-about .about-network {
  background: var(--fog);
  color: var(--about-ink);
  padding: var(--about-pad) 0;
}

.page-about .about-network .about-head {
  border-bottom-color: rgba(27, 42, 56, 0.16);
}

.page-about .about-network__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-network__copy p {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(27, 42, 56, 0.86);
}

.page-about .about-network__mapwrap {
  background: var(--concrete);
  border-radius: 4px 26px 4px 26px;
  padding: clamp(18px, 3vw, 28px);
  min-width: 0;
}

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

.page-about .about-map__pin circle {
  fill: var(--slate);
  transition: fill 180ms var(--ease), r 180ms var(--ease);
}

.page-about .about-map__pin--main circle {
  fill: var(--amber-deep);
}

.page-about .about-map__pin text {
  font-family: var(--font-body);
  font-size: 15px;
  fill: rgba(27, 42, 56, 0.86);
  text-anchor: middle;
  letter-spacing: 0.06em;
}

.page-about .about-map__pin:hover circle {
  fill: var(--amber);
}

.page-about .about-map__pin:hover text {
  fill: var(--amber-deep);
}

.page-about .about-network__legend {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(27, 42, 56, 0.66);
  border-top: 1px solid rgba(27, 42, 56, 0.14);
  padding-top: 12px;
}

.page-about .about-network__bottom {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-network__figure {
  margin: 0;
  min-width: 0;
}

.page-about .about-network__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 22px 4px 22px 4px;
}

.page-about .about-network__figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(27, 42, 56, 0.6);
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(27, 42, 56, 0.14);
  min-width: 0;
}

.page-about .about-flow__step {
  background: var(--fog);
  padding: 18px 16px;
}

.page-about .about-flow__idx {
  display: block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber-deep);
}

.page-about .about-flow__step h3 {
  margin: 8px 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 400;
  line-height: 1.3;
  color: var(--about-ink);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(27, 42, 56, 0.76);
}

/* ---------- 赛后数据 ---------- */
.page-about .about-verify {
  background: var(--slate);
  padding: var(--about-pad) 0;
}

.page-about .about-verify__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-verify__lead p {
  margin: 0 0 16px;
  max-width: 54ch;
  font-size: 17px;
  line-height: 1.78;
  color: rgba(247, 245, 241, 0.8);
}

.page-about .about-verify__callout {
  margin-top: 24px;
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 20px 22px;
  border-left: 3px solid var(--alert);
  background: rgba(13, 20, 27, 0.42);
  border-radius: 0 18px 18px 0;
}

.page-about .about-verify__num {
  font-family: var(--font-data);
  font-size: clamp(38px, 5vw, 56px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--fog);
  text-decoration: underline;
  text-decoration-color: var(--alert);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
}

.page-about .about-verify__callout-text {
  font-size: 15px;
  line-height: 1.5;
  color: var(--fog);
}

.page-about .about-verify__callout-text span {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 245, 241, 0.6);
}

.page-about .about-verify__panel {
  background: rgba(13, 20, 27, 0.46);
  border: 1px solid var(--about-line-soft);
  border-radius: 4px 24px 4px 24px;
  padding: clamp(18px, 3vw, 26px);
  min-width: 0;
}

.page-about .about-verify__panel-title {
  margin: 0 0 16px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-soft);
  counter-reset: none;
}

.page-about .about-items li {
  background: rgba(27, 42, 56, 0.94);
  padding: 12px 12px;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(247, 245, 241, 0.86);
  position: relative;
  padding-left: 30px;
}

.page-about .about-items li::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 19px;
  width: 7px;
  height: 1px;
  background: var(--amber);
}

/* ---------- 版本阶梯 ---------- */
.page-about .about-versions {
  position: relative;
  overflow: hidden;
  background: var(--night);
  padding: var(--about-pad) 0;
}

.page-about .about-versions__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
}

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

.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  align-items: end;
}

.page-about .about-step {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px 18px;
  background: rgba(27, 42, 56, 0.92);
  border: 1px solid var(--about-line-soft);
  border-radius: 4px 20px 4px 20px;
  min-width: 0;
  transition: border-color 180ms var(--ease), background 180ms var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--blue);
  background: rgba(27, 42, 56, 1);
}

.page-about .about-step__ver {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-step__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 400;
  line-height: 1.28;
  color: var(--fog);
}

.page-about .about-step__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .about-step__list li {
  font-size: 14px;
  line-height: 1.55;
  color: rgba(247, 245, 241, 0.7);
  padding-left: 12px;
  position: relative;
}

.page-about .about-step__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 1px;
  background: var(--brick);
}

.page-about .about-step--v4 {
  border-color: rgba(47, 163, 107, 0.55);
  background: rgba(27, 42, 56, 1);
}

.page-about .about-step--v4 .about-step__ver {
  color: var(--jade);
}

.page-about .about-step--v4 .about-step__list li::before {
  background: var(--jade);
}

.page-about .about-step--v4:hover {
  border-color: var(--jade);
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem {
  background: var(--concrete);
  color: var(--about-ink);
  padding: var(--about-pad) 0;
}

.page-about .about-ecosystem .about-head {
  border-bottom-color: rgba(27, 42, 56, 0.16);
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-eco__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(27, 42, 56, 0.14);
  min-width: 0;
}

.page-about .about-eco__stats li {
  background: var(--concrete);
  padding: 18px 16px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.page-about .about-eco__num {
  font-family: var(--font-data);
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--about-ink);
  text-decoration: underline;
  text-decoration-color: var(--amber-deep);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
  flex: 0 0 auto;
}

.page-about .about-eco__label {
  flex: 1 1 12ch;
  min-width: 0;
  font-size: 15px;
  line-height: 1.68;
  color: rgba(27, 42, 56, 0.78);
}

.page-about .about-eco__report {
  background: var(--about-ink);
  color: var(--fog);
  border-radius: 26px 4px 26px 4px;
  padding: clamp(20px, 3vw, 30px);
  min-width: 0;
}

.page-about .about-eco__report-tag {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--jade);
}

.page-about .about-eco__report h3 {
  margin: 12px 0 14px;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 28px);
  font-weight: 400;
  line-height: 1.3;
  color: var(--fog);
}

.page-about .about-eco__report p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(247, 245, 241, 0.78);
}

.page-about .about-eco__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 3px;
  font-size: 15px;
  color: var(--fog);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-eco__link:hover {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--slate);
  padding: clamp(40px, 6vw, 80px) 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-next__title {
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-family: var(--font-display);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 300;
  line-height: 1.24;
  color: var(--fog);
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-next__links li {
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-next__links a {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 4px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 22px);
  color: rgba(247, 245, 241, 0.86);
  text-decoration: none;
  transition: color 160ms var(--ease), padding-left 220ms var(--ease), background 220ms var(--ease);
}

.page-about .about-next__idx {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--brick);
  flex: 0 0 auto;
}

.page-about .about-next__links a > span:nth-child(2) {
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-next__arrow {
  flex: 0 0 auto;
  color: var(--amber);
  opacity: 0.5;
  transition: opacity 160ms var(--ease), transform 220ms var(--ease);
}

.page-about .about-next__links a:hover {
  color: var(--amber);
  padding-left: 14px;
  background: rgba(13, 20, 27, 0.4);
}

.page-about .about-next__links a:hover .about-next__arrow {
  opacity: 1;
  transform: translateX(4px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-origin__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: end;
  }

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

  .page-about .about-pulse__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(32px, 5vw, 72px);
  }

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

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

  .page-about .about-flow {
    gap: 1px;
  }

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

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

  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-step--v1 {
    min-height: 172px;
  }

  .page-about .about-step--v2 {
    min-height: 208px;
  }

  .page-about .about-step--v3 {
    min-height: 244px;
  }

  .page-about .about-step--v4 {
    min-height: 292px;
  }

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

@media (min-width: 1180px) {
  .page-about .about-tl {
    padding: 8px 0 0;
  }

  .page-about .about-tl::before {
    left: 50%;
    top: 10px;
    bottom: 10px;
  }

  .page-about .about-tl__item {
    width: 50%;
    padding-left: 0;
    padding-right: clamp(30px, 4vw, 56px);
    text-align: right;
  }

  .page-about .about-tl__item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: clamp(30px, 4vw, 56px);
    text-align: left;
  }

  .page-about .about-tl__node {
    left: auto;
    right: -5px;
    box-shadow: 0 0 0 4px var(--night);
  }

  .page-about .about-tl__item:nth-child(even) .about-tl__node {
    right: auto;
    left: -5px;
  }

  .page-about .about-tl__text {
    margin-left: auto;
  }

  .page-about .about-tl__item:nth-child(even) .about-tl__text {
    margin-left: 0;
  }

  .page-about .about-tl__foot {
    justify-content: flex-end;
  }

  .page-about .about-tl__item:nth-child(even) .about-tl__foot {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-map__pin circle,
  .page-about .about-eco__link,
  .page-about .about-next__links a,
  .page-about .about-next__arrow {
    transition: none;
  }

  .page-about .about-next__links a:hover .about-next__arrow {
    transform: none;
  }
}
<<<END>>>