.page-about {
  background: var(--carbon);
  color: var(--text);
}

.page-about .crumbs__sep {
  margin: 0 8px;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 56px) 0 clamp(40px, 7vw, 88px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(199, 242, 80, .10), transparent 55%),
    linear-gradient(158deg, var(--surface) 0%, var(--carbon) 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -46%;
  width: 62%;
  aspect-ratio: 1 / 1;
  background: repeating-linear-gradient(90deg, rgba(36, 68, 58, .5) 0 1px, transparent 1px 24px);
  transform: rotate(-14deg);
  opacity: .55;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
  margin-top: clamp(22px, 4vw, 38px);
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-size: var(--fs-1);
  line-height: 1.12;
  letter-spacing: -.02em;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: var(--fs-5);
  line-height: 1.8;
}

.page-about .about-hero__facts {
  list-style: none;
  display: grid;
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--line);
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
}

.page-about .about-hero__facts li {
  background: var(--surface);
  padding: 14px 16px;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 4vw, 2.15rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__label {
  display: block;
  margin-top: 4px;
  font-size: .82rem;
  color: var(--muted);
  letter-spacing: .02em;
}

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

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-soft);
}

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

.page-about .about-hero__media figcaption {
  padding: 12px 16px;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding-top: clamp(30px, 6vw, 70px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

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

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(30, 27, 69, .55), rgba(8, 17, 14, 0));
  padding: 14px 16px;
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .about-toc .toc__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc .toc__link {
  display: inline-flex;
  gap: 8px;
  align-items: baseline;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--text);
  font-size: .88rem;
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-toc .toc__link:hover,
.page-about .about-toc .toc__link:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}

.page-about .about-toc__num {
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--orange);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(30px, 5vw, 46px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-chapter__head {
  margin-bottom: clamp(22px, 3.5vw, 32px);
  padding: 18px 20px 20px;
  border-left: 2px solid var(--lime);
  background: linear-gradient(100deg, var(--wine) 0%, rgba(74, 19, 48, .28) 66%, transparent 100%);
}

.page-about .about-chapter--indigo .about-chapter__head {
  background: linear-gradient(100deg, var(--indigo) 0%, rgba(30, 27, 69, .3) 66%, transparent 100%);
  border-left-color: var(--orange);
}

.page-about .about-chapter__index {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-chapter__head h2 {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.25;
  letter-spacing: -.01em;
}

.page-about .about-chapter__lede {
  margin: 10px 0 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: var(--fs-5);
  line-height: 1.75;
}

.page-about .about-chapter__grid {
  display: grid;
  gap: 22px;
}

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

.page-about .about-chapter__aside {
  border-top: 1px solid var(--line);
  padding-top: 14px;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.75;
}

.page-about .about-chapter__aside p {
  margin: 0 0 10px;
}

.page-about .about-chapter__aside p:last-child {
  margin-bottom: 0;
}

.page-about .about-aside__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 2px 0 0 22px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), var(--line) 58%, transparent);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 5px;
  width: 11px;
  height: 11px;
  background: var(--carbon);
  border: 1px solid var(--orange);
  transition: background .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .about-timeline__stage {
  margin: 0 0 5px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-timeline__title {
  margin: 0 0 7px;
  font-size: var(--fs-5);
  line-height: 1.4;
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 54ch;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-timeline__stat {
  margin: 10px 0 0;
  padding-left: 10px;
  border-left: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--muted);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__stat {
  color: var(--lime);
  border-left-color: var(--lime);
}

/* ---------- 通用配图 ---------- */
.page-about .about-media {
  margin: 0 0 24px;
  border: 1px solid var(--line);
  background: var(--panel);
}

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

.page-about .about-media figcaption {
  padding: 10px 14px;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
}

.page-about .about-team__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--lime);
  transition: border-left-color .18s var(--ease), background .18s var(--ease);
}

.page-about .about-team__item:hover {
  background: var(--surface);
  border-left-color: var(--orange);
}

.page-about .about-team__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-team__item h3 {
  margin: 0 0 8px;
  font-size: var(--fs-5);
}

.page-about .about-team__item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-team__item p.about-team__meta {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .03em;
  color: var(--lime);
}

.page-about .about-team__share {
  margin: 22px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--wine);
  background: rgba(74, 19, 48, .16);
  color: var(--text);
  line-height: 1.8;
}

/* ---------- 读者分布 ---------- */
.page-about .about-region__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .about-region__list li {
  display: grid;
  grid-template-columns: minmax(78px, 96px) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-region__list b {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-region__list span {
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-region__text {
  margin: 0 0 14px;
  max-width: 56ch;
  line-height: 1.85;
}

.page-about .about-region__text:last-child {
  margin-bottom: 0;
}

.page-about .about-link {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(199, 242, 80, .45);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-bottom-color: var(--lime);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 24px;
}

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

.page-about .about-partner-types {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-partner-types li {
  padding-left: 14px;
  border-left: 2px solid var(--orange);
}

.page-about .about-partner-types h3 {
  margin: 0 0 6px;
  font-size: var(--fs-5);
}

.page-about .about-partner-types p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-partners__text {
  margin: 0;
  max-width: 54ch;
  line-height: 1.85;
}

.page-about .about-media--partner {
  margin-bottom: 0;
  align-self: start;
}

/* ---------- 赛季节奏 ---------- */
.page-about .about-season {
  display: grid;
  gap: 16px;
}

.page-about .about-season__card {
  padding: 20px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(23, 58, 47, .72), rgba(8, 17, 14, .38));
}

.page-about .about-season__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .12em;
  color: var(--orange);
}

.page-about .about-season__card h3 {
  margin: 0 0 8px;
  font-size: var(--fs-5);
}

.page-about .about-season__card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-season__note {
  margin: 22px 0 0;
  max-width: 56ch;
  line-height: 1.85;
}

/* ---------- 结尾行动 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 18px;
  margin-top: clamp(28px, 5vw, 48px);
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  background: linear-gradient(120deg, var(--indigo) 0%, rgba(30, 27, 69, .22) 62%, transparent 100%);
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  font-size: var(--fs-3);
  line-height: 1.3;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 52ch;
  color: var(--muted);
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-season {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 820px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr) minmax(160px, 196px);
    gap: clamp(24px, 3.5vw, 36px);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: clamp(24px, 4vw, 40px);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: minmax(172px, 208px) minmax(0, 1fr);
    gap: clamp(34px, 4.5vw, 60px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 20px);
    padding: 18px 18px 20px;
  }

  .page-about .about-toc .toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .about-toc .toc__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 0;
    border: 0;
    border-bottom: 1px solid var(--line-soft);
    white-space: normal;
    font-size: .93rem;
  }

  .page-about .about-toc .toc__link:last-child {
    border-bottom: 0;
  }

  .page-about .about-toc .toc__link:hover,
  .page-about .about-toc .toc__link:focus-visible {
    color: var(--lime);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__stat,
  .page-about .about-team__item,
  .page-about .about-toc .toc__link {
    transition: none;
  }
}