.page-about {
  --about-gap: clamp(20px, 3vw, 48px);
  --about-sec-y: clamp(48px, 7vw, 96px);
  position: relative;
  background: var(--jb-night);
  color: var(--jb-mist);
  font-family: var(--jb-body);
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 40;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(242, 239, 230, 0.035) 0,
    rgba(242, 239, 230, 0.035) 1px,
    transparent 1px,
    transparent 4px
  );
}

.page-about a {
  color: inherit;
}

/* ---------- 面包屑 ---------- */

.page-about .about-crumbs {
  padding-top: clamp(16px, 3vw, 28px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(22px, 3.6vw, 44px) 0 clamp(44px, 6vw, 88px);
  border-bottom: 1px solid var(--jb-hair-soft);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-family: var(--jb-head);
  font-weight: 300;
  font-size: clamp(2.2rem, 7.2vw, 5.2rem);
  line-height: 1.03;
  letter-spacing: -0.012em;
  color: var(--jb-paper);
  max-width: 20ch;
}

.page-about .about-hero__desc {
  margin: 0 0 22px;
  max-width: 48ch;
  font-size: clamp(0.98rem, 1.6vw, 1.1rem);
  line-height: 1.78;
  color: var(--jb-dim);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--jb-hair);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}

.page-about .about-hero__meta li {
  font-family: var(--jb-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--jb-dim);
}

.page-about .about-hero__meta .jb-num {
  color: var(--jb-cyan);
  font-size: 0.92rem;
}

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__figure .jb-figure__cap {
  margin-top: 10px;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--jb-dim);
}

/* ---------- 通用章节 ---------- */

.page-about .about-sec {
  padding: var(--about-sec-y) 0;
  border-top: 1px solid var(--jb-hair-soft);
}

.page-about .about-sec--paper {
  background: var(--jb-paper);
  color: var(--jb-ink);
  border-top-color: transparent;
}

.page-about .about-sec--deep {
  background: var(--jb-deep);
}

.page-about .about-sec__inner {
  display: grid;
  gap: 14px;
}

.page-about .about-sec__title {
  margin: 0 0 18px;
  font-family: var(--jb-head);
  font-weight: 700;
  font-size: clamp(1.65rem, 3.8vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.006em;
  color: var(--jb-paper);
  max-width: 26ch;
}

.page-about .about-sec--paper .about-sec__title {
  color: var(--jb-ink);
}

.page-about .about-sec--paper .jb-eyebrow {
  color: rgba(4, 36, 28, 0.62);
}

.page-about .about-sec__main p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.78;
}

.page-about .about-sec__lede {
  font-size: clamp(1rem, 1.7vw, 1.14rem);
  color: var(--jb-paper);
}

/* ---------- 内容生产链路 ---------- */

.page-about .about-flow__head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-flow__intro {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.75;
  color: rgba(4, 36, 28, 0.72);
}

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

.page-about .about-tree::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(
    to bottom,
    var(--jb-night) 0,
    rgba(5, 46, 36, 0.28) 18%,
    rgba(5, 46, 36, 0.18) 100%
  );
}

.page-about .about-tree__item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 30px;
}

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

.page-about .about-tree__mark {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}

.page-about .about-tree__mark::before {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--jb-night);
  background: var(--jb-paper);
  box-shadow: 0 0 0 4px rgba(5, 46, 36, 0.08);
  position: relative;
  z-index: 1;
}

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

.page-about .about-tree__idx {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: #a06a00;
  margin-bottom: 6px;
}

.page-about .about-tree__name {
  margin: 0 0 8px;
  font-family: var(--jb-head);
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--jb-ink);
}

.page-about .about-tree__text {
  margin: 0 0 8px;
  max-width: 64ch;
  font-size: 0.96rem;
  line-height: 1.78;
  color: rgba(4, 36, 28, 0.76);
}

.page-about .about-tree__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--jb-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #8a5b00;
}

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

.page-about .about-tree__more summary::after {
  content: "+";
  font-size: 0.95rem;
  line-height: 1;
}

.page-about .about-tree__more[open] summary::after {
  content: "–";
}

.page-about .about-tree__more p {
  margin: 6px 0 0;
  max-width: 62ch;
  padding-left: 14px;
  border-left: 2px solid var(--jb-amber);
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(4, 36, 28, 0.7);
}

/* ---------- 联赛分类 ---------- */

.page-about .about-leagues__head {
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.page-about .about-leagues {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-leagues__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-leagues__list li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--jb-hair-soft);
}

.page-about .about-leagues__list li:first-child {
  border-top: 1px solid var(--jb-hair);
}

.page-about .about-leagues__name {
  font-family: var(--jb-head);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--jb-paper);
}

.page-about .about-leagues__note {
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--jb-dim);
}

.page-about .about-leagues__figure {
  margin: 0 0 22px;
}

.page-about .about-leagues__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .about-leagues__main p {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 0.98rem;
  line-height: 1.78;
  color: var(--jb-dim);
}

/* ---------- 团队 ---------- */

.page-about .about-team__head {
  max-width: 62ch;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-team__intro {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.75;
  color: rgba(4, 36, 28, 0.72);
}

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(5, 46, 36, 0.16);
}

.page-about .about-team__item {
  background: var(--jb-paper);
  padding: clamp(18px, 2.6vw, 30px);
}

.page-about .about-team__num {
  display: block;
  font-size: clamp(2rem, 4.2vw, 2.9rem);
  line-height: 1;
  color: var(--jb-night);
  margin-bottom: 12px;
}

.page-about .about-team__role {
  display: block;
  font-family: var(--jb-head);
  font-size: 1.06rem;
  font-weight: 700;
  color: var(--jb-ink);
  margin-bottom: 6px;
}

.page-about .about-team__desc {
  display: block;
  font-size: 0.86rem;
  line-height: 1.68;
  color: rgba(4, 36, 28, 0.7);
}

/* ---------- 版本演进 ---------- */

.page-about .about-vers__figure {
  margin: 0 0 clamp(22px, 3.4vw, 40px);
}

.page-about .about-vers__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 4;
  object-fit: cover;
}

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

.page-about .about-vers__item {
  position: relative;
  padding-left: 18px;
  border-left: 2px solid var(--jb-cyan);
}

.page-about .about-vers__year {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--jb-amber);
  margin-bottom: 8px;
}

.page-about .about-vers__name {
  margin: 0 0 8px;
  font-family: var(--jb-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--jb-paper);
}

.page-about .about-vers__item p {
  margin: 0;
  max-width: 46ch;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--jb-dim);
}

/* ---------- 运营城市与联系 ---------- */

.page-about .about-city__inner {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-city__lead p {
  margin: 0 0 16px;
  max-width: 60ch;
  font-size: 0.98rem;
  line-height: 1.78;
  color: var(--jb-dim);
}

.page-about .about-city__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px !important;
}

.page-about .about-city__contact {
  margin: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-city__contact > div {
  border-top: 1px solid var(--jb-hair);
  padding-top: 12px;
}

.page-about .about-city__contact dt {
  font-family: var(--jb-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--jb-amber);
  margin-bottom: 6px;
}

.page-about .about-city__contact dd {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--jb-paper);
  overflow-wrap: anywhere;
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-leagues__list li {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: baseline;
    gap: 18px;
  }

  .page-about .about-leagues__note {
    text-align: right;
    max-width: 18ch;
  }

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

@media (min-width: 760px) {
  .page-about .about-tree::before {
    left: 19px;
  }

  .page-about .about-tree__item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 26px;
    padding-bottom: 42px;
  }

  .page-about .about-vers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid var(--jb-hair);
  }

  .page-about .about-vers__item {
    border-left: 1px solid var(--jb-hair);
    padding: 26px clamp(16px, 2.4vw, 30px) 6px;
  }

  .page-about .about-vers__item:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-vers__item::before {
    content: "";
    position: absolute;
    left: 0;
    top: -1px;
    width: 38px;
    height: 3px;
    background: var(--jb-cyan);
  }
}

@media (min-width: 940px) {
  .page-about .about-leagues {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.6fr);
    gap: clamp(32px, 5vw, 84px);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-sec__inner {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .about-city__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 84px);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about::before {
    display: none;
  }

  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}