.page-about {
  display: block;
  background: var(--c-bg);
  color: var(--c-white);
}

.page-about .section {
  position: relative;
  padding: clamp(56px, 8vw, 104px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-head {
  display: grid;
  gap: 10px;
}

.page-about .about-head__note {
  max-width: 60ch;
  color: var(--c-slate);
  line-height: 1.75;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 5vw, 64px) 0 clamp(52px, 7vw, 96px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 84% 0%, rgba(61, 242, 218, 0.14), transparent 58%),
    linear-gradient(180deg, var(--c-bg-2) 0%, var(--c-bg) 72%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 64px);
  opacity: 0.75;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(2.05rem, 6.2vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 60ch;
  color: var(--c-white);
  opacity: 0.86;
  line-height: 1.85;
}

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

.page-about .about-facts {
  align-self: stretch;
}

.page-about .about-facts__label {
  color: var(--c-ink);
  opacity: 0.7;
}

.page-about .about-facts__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-facts__list li {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: 6px 16px;
  align-items: baseline;
  padding: 11px 0;
  border-top: 1px solid rgba(10, 14, 20, 0.16);
  font-size: 0.95rem;
  line-height: 1.65;
}

.page-about .about-facts__list li:first-child {
  border-top: 0;
}

.page-about .about-facts__num {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-ink);
  white-space: nowrap;
}

/* ---------- 发展历程 ---------- */

.page-about .about-timeline__banner {
  margin: clamp(24px, 3.5vw, 40px) 0 clamp(32px, 4.5vw, 56px);
}

.page-about .tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 10px;
  bottom: 34px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, rgba(61, 242, 218, 0.34) 48%, rgba(61, 242, 218, 0.05) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 40px);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--c-cyan);
}

.page-about .tl__year {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  border: 1px solid var(--line-cyan);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
}

.page-about .tl__card {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--c-bg-2);
  border: 1px solid var(--line);
  border-top: 2px solid rgba(61, 242, 218, 0.5);
}

.page-about .tl__card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
  color: var(--c-white);
}

.page-about .tl__card p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: var(--c-slate);
}

/* ---------- 团队与分工 ---------- */

.page-about .about-team {
  background: var(--c-bg-2);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(24px, 3.5vw, 40px);
}

.page-about .seg__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .seg__btn {
  padding: 9px 16px;
  font-family: var(--font-cond);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-slate);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 0;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .seg__btn:hover {
  color: var(--c-white);
  border-color: var(--line-cyan);
}

.page-about .seg__btn.is-current,
.page-about .seg__btn[aria-selected="true"] {
  color: var(--c-ink);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

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

.page-about .about-team__panels {
  padding-top: clamp(20px, 2.8vw, 30px);
}

.page-about .seg__panel + .seg__panel {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px dashed var(--line);
}

.page-about .about-team__count {
  display: block;
  margin: 0 0 8px;
  font-size: clamp(2rem, 4.6vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .about-team__count small {
  margin-left: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--c-slate);
}

.page-about .seg__panel h3 {
  margin: 0 0 12px;
  font-size: 1.08rem;
  color: var(--c-white);
}

.page-about .seg__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--c-slate);
}

.page-about .about-team__figure {
  margin: 0;
}

/* ---------- 栏目体系 ---------- */

.page-about .about-cols {
  display: grid;
  margin: clamp(24px, 3.5vw, 40px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-cols .index-list__item {
  display: grid;
  gap: 8px 22px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background var(--dur) var(--ease);
}

.page-about .about-cols .index-list__no {
  font-size: 0.88rem;
  color: var(--c-steal);
  letter-spacing: 0.06em;
}

.page-about .about-cols__title {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
}

.page-about .about-cols .index-list__link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-cols .index-list__link:hover,
.page-about .about-cols .index-list__link:focus-visible {
  color: var(--c-cyan-soft);
  border-bottom-color: var(--c-cyan-soft);
}

.page-about .about-cols .index-list__note {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-slate);
}

/* ---------- 赛事覆盖 ---------- */

.page-about .about-coverage__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-coverage__intro {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-slate);
}

.page-about .about-coverage__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-coverage__list li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-coverage__stage {
  font-family: var(--font-cond);
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--c-cyan);
}

.page-about .about-coverage__desc {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--c-slate);
}

.page-about .about-coverage__figure {
  margin: 0;
}

/* ---------- 线路与区域服务 ---------- */

.page-about .about-lines {
  background: var(--c-bg-2);
}

.page-about .about-lines__stats {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.5vw, 40px);
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-lines__stat {
  display: grid;
  gap: 8px;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--c-bg-2);
}

.page-about .about-lines__stat .stat__num {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .about-lines__stat .stat__label {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--c-slate);
}

.page-about .about-lines__stat.stat--peak .stat__num {
  color: var(--c-steal);
}

.page-about .about-lines__ruler {
  height: 34px;
  margin-top: 22px;
  background-image: repeating-linear-gradient(90deg, var(--line-cyan) 0 1px, transparent 1px 3.846%);
  background-repeat: repeat-x;
  background-size: 100% 100%;
  opacity: 0.85;
}

.page-about .about-lines__body {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 3.2vw, 36px);
}

.page-about .about-lines__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--c-slate);
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.5vw, 40px);
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-eco__card {
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--c-bg);
  border-top: 2px solid rgba(61, 242, 218, 0.4);
}

.page-about .about-eco__no {
  display: block;
  margin-bottom: 12px;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.page-about .about-eco__card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--c-white);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--c-slate);
}

.page-about .about-eco__more {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 0.95rem;
  color: var(--c-slate);
}

.page-about .about-eco__more a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

.page-about .about-eco__more a:hover {
  color: var(--c-cyan-soft);
}

/* ---------- 联系与备案 ---------- */

.page-about .about-reach {
  background: var(--c-bg-2);
  border-bottom: 0;
}

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: start;
}

.page-about .about-reach__main p {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--c-slate);
}

.page-about .about-reach__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.page-about .about-reach__links a {
  font-family: var(--font-cond);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
}

.page-about .about-reach__links a:hover {
  color: var(--c-cyan-soft);
}

.page-about .about-reach__panel {
  margin: 0;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--c-bg-3);
  border: 1px solid var(--line);
}

.page-about .about-reach__row {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 13px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-reach__row:first-child {
  padding-top: 0;
  border-top: 0;
}

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

.page-about .about-reach__key {
  font-family: var(--font-cond);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  text-transform: uppercase;
}

.page-about .about-reach__val {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--c-white);
  overflow-wrap: break-word;
  word-break: break-word;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .about-lines__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-cols .index-list__item {
    grid-template-columns: 56px 180px minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(32px, 4.5vw, 64px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

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

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

  .page-about .tl {
    padding-left: 34px;
  }

  .page-about .tl__item::before {
    left: -34px;
    width: 9px;
    height: 9px;
  }

  .page-about .tl::before {
    left: 4px;
  }
}

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

@media (max-width: 520px) {
  .page-about .about-reach__row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-about .about-coverage__list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .about-facts__list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .seg__btn,
  .page-about .about-cols .index-list__item,
  .page-about .about-cols .index-list__link {
    transition: none;
  }
}