.page-about {
  background: var(--c-void);
  color: var(--c-text);
  overflow-x: hidden;
}

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

.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 26px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-muted);
}

.page-about .crumbs a {
  color: var(--c-muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease-out);
}

.page-about .crumbs a:hover {
  color: var(--c-gold);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--c-text-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 0 0 72px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -10%;
  left: 38%;
  height: 420px;
  background: radial-gradient(closest-side, rgba(242, 178, 60, 0.13), rgba(242, 178, 60, 0) 72%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
  margin-top: 30px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(2.5rem, 10vw, 5.6rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.01em;
}

.page-about .about-hero__title-sub {
  display: block;
  color: var(--c-gold);
}

.page-about .about-hero .lede {
  margin-top: 22px;
}

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

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

.page-about .about-facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
  margin: 52px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--c-line);
}

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

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-style: italic;
  font-size: 26px;
  letter-spacing: -0.02em;
  color: var(--c-gold);
}

.page-about .about-facts__label {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-muted);
}

/* ---------- 历程时间线 ---------- */
.page-about .story {
  padding: 72px 0;
  background: var(--c-panel);
  border-top: 1px solid var(--c-line-soft);
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .story__lede {
  margin-top: 14px;
}

.page-about .story__layout {
  display: grid;
  gap: 32px;
  margin-top: 36px;
}

.page-about .story__layout > * {
  min-width: 0;
}

.page-about .story__index {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}

.page-about .story__index::-webkit-scrollbar {
  display: none;
}

.page-about .story__idx {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-pill);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out);
}

.page-about .story__idx:hover {
  color: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about .story__idx-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-blue);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-blue), var(--c-violet) 58%, rgba(138, 107, 255, 0));
}

.page-about .milestone {
  position: relative;
  padding: 0 0 34px;
  scroll-margin-top: 130px;
}

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

.page-about .milestone::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -28px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-void);
  border: 1px solid var(--c-blue);
  box-shadow: 0 0 0 3px rgba(63, 169, 245, 0.14);
  transition: background var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out);
}

.page-about .milestone:hover::before {
  background: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about .milestone__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-gold);
}

.page-about .milestone__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 500;
  line-height: 1.5;
}

.page-about .milestone__more {
  max-width: 34em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
  opacity: 0.78;
  transition: opacity var(--dur) var(--ease-out);
}

.page-about .milestone:hover .milestone__more {
  opacity: 1;
}

/* ---------- 设计取舍 ---------- */
.page-about .tradeoffs {
  padding: 76px 0;
}

.page-about .tradeoff {
  display: grid;
  margin-top: 36px;
}

.page-about .tradeoff__row {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .tradeoff__row:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .tradeoff__choice {
  margin: 0;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.6;
}

.page-about .tradeoff__choice::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 12px;
  background: var(--c-gold);
  transform: translateY(-3px) rotate(45deg);
}

.page-about .tradeoff__effect {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
}

/* ---------- 对局记录 ---------- */
.page-about .fair {
  padding: 72px 0;
  background: var(--c-card);
}

.page-about .fair__grid {
  display: grid;
  gap: 30px;
  margin-top: 36px;
}

.page-about .fair__item {
  padding-top: 20px;
  border-top: 1px solid var(--c-gold);
}

.page-about .fair__item:nth-child(2) {
  border-top-color: var(--c-blue);
}

.page-about .fair__item:nth-child(3) {
  border-top-color: var(--c-violet);
}

.page-about .fair__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.55;
}

.page-about .fair__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
}

.page-about .fair__note {
  margin: 34px 0 0;
  font-size: 14px;
  color: var(--c-text-soft);
}

/* ---------- 节点与团队 ---------- */
.page-about .ops {
  position: relative;
  padding: 76px 0;
}

.page-about .ops__grid {
  display: grid;
  gap: 32px;
  margin-top: 36px;
}

.page-about .ops__grid > * {
  min-width: 0;
}

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

.page-about .ops__body p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-text-soft);
}

.page-about .city-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .city {
  padding: 7px 14px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  transition: color var(--dur) var(--ease-out), background var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out);
}

.page-about .city:hover {
  color: var(--c-void);
  background: var(--c-gold);
  border-color: var(--c-gold-hi);
}

.page-about .ops__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 34px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.45);
}

.page-about .ops__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  background: var(--c-card);
}

/* ---------- 赛季与社区 ---------- */
.page-about .seasons {
  padding: 72px 0;
  background: var(--c-panel);
}

.page-about .seasons__grid {
  display: grid;
  gap: 34px;
  margin-top: 36px;
}

.page-about .seasons__grid > * {
  min-width: 0;
}

.page-about .seasons__body p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--c-text-soft);
}

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

/* ---------- 版本方向 ---------- */
.page-about .next {
  padding: 76px 0 96px;
}

.page-about .next__list {
  list-style: none;
  display: grid;
  gap: 26px;
  margin: 36px 0 0;
  padding: 0;
}

.page-about .next__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
}

.page-about .next__num {
  font-family: var(--font-mono);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--c-blue);
}

.page-about .next__item p {
  max-width: 38em;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text-soft);
}

.page-about .next__cta {
  display: grid;
  gap: 20px;
  margin-top: 52px;
  padding-top: 30px;
  border-top: 1px solid var(--c-line);
}

.page-about .next__cta-text {
  max-width: 34em;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px) {
  .page-about .fair__grid {
    gap: 36px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-bottom: 96px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 56px;
    margin-top: 42px;
  }

  .page-about .about-hero__title {
    font-size: clamp(3.2rem, 6.4vw, 6.4rem);
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 72px;
  }

  .page-about .story {
    padding: 104px 0;
  }

  .page-about .story__layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .story__index {
    position: sticky;
    top: 132px;
    align-self: start;
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .story__idx {
    padding: 9px 0 9px 16px;
    border: 0;
    border-left: 1px solid var(--c-line);
    border-radius: 0;
  }

  .page-about .story__idx:hover {
    border-left-color: var(--c-gold);
  }

  .page-about .tradeoffs,
  .page-about .ops {
    padding: 104px 0;
  }

  .page-about .fair,
  .page-about .seasons {
    padding: 96px 0;
  }

  .page-about .tradeoff__row {
    grid-template-columns: minmax(0, 4fr) minmax(0, 6fr);
    gap: 40px;
    align-items: baseline;
    padding: 26px 0;
  }

  .page-about .tradeoff__effect {
    font-size: 16px;
  }

  .page-about .fair__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
  }

  .page-about .ops__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ops__stats {
    position: relative;
    z-index: 2;
    margin-top: -58px;
    margin-left: 28%;
  }

  .page-about .seasons__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: center;
  }

  .page-about .next {
    padding: 104px 0 128px;
  }

  .page-about .next__cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}