.page-about{
  background: var(--sj-cream);
  color: var(--sj-stone);
  font-family: var(--sj-sans);
  line-height: 1.75;
}

.page-about .sj-crumb{
  padding-block: 1.15rem .2rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  isolation: isolate;
  padding-block: clamp(1.2rem, 3.5vw, 2.4rem) clamp(2.2rem, 6vw, 4.4rem);
}

.page-about .about-hero::before{
  content: "";
  position: absolute;
  z-index: -1;
  top: -8%;
  right: -12%;
  width: min(60vw, 660px);
  aspect-ratio: 1 / .8;
  background: var(--sj-grad-gold);
  opacity: .14;
  border-radius: 64% 36% 44% 56% / 52% 46% 54% 48%;
  pointer-events: none;
}

.page-about .about-hero__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 3.2rem);
  align-items: end;
}

.page-about .about-hero h1{
  font-family: var(--sj-serif);
  font-weight: 700;
  font-size: clamp(2rem, 1.2rem + 4.2vw, 4.1rem);
  line-height: 1.09;
  letter-spacing: -.02em;
  color: var(--sj-ink);
  margin: .7rem 0 1.1rem;
  max-width: 17ch;
}

.page-about .about-hero .sj-lede{
  max-width: 48ch;
  margin: 0;
  font-size: clamp(1rem, .94rem + .3vw, 1.1rem);
  color: var(--sj-stone);
}

@media (min-width: 900px){
  .page-about .about-hero__grid{
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .85fr);
  }
}

/* 首屏数据格 */
.page-about .about-stats{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--sj-line-soft);
  border: 1px solid var(--sj-line);
  border-radius: var(--sj-radius-sm);
  overflow: hidden;
}

.page-about .about-stat{
  background: var(--sj-cream);
  padding: .95rem .9rem;
}

.page-about .about-stat b{
  display: block;
  font-family: var(--sj-mono);
  font-weight: 600;
  font-size: clamp(1.25rem, 1.05rem + 1.1vw, 1.6rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--sj-gold-deep);
}

.page-about .about-stat span{
  display: block;
  margin-top: .35rem;
  font-size: .78rem;
  line-height: 1.55;
  color: var(--sj-stone);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-jump{
  border-top: 1px solid var(--sj-line-soft);
  border-bottom: 1px solid var(--sj-line-soft);
  padding-block: .6rem;
}

.page-about .about-jump__list{
  list-style: none;
  margin: 0;
  padding: 0 0 .15rem;
  display: flex;
  gap: .55rem;
  overflow-x: auto;
}

.page-about .about-jump__list li{ flex: 0 0 auto; }

.page-about .about-jump__list a{
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .42rem .85rem;
  border: 1px solid var(--sj-line);
  border-radius: 999px;
  font-family: var(--sj-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  color: var(--sj-ink);
  text-decoration: none;
  background-image: linear-gradient(140deg, rgba(201,169,110,.18), rgba(245,239,230,0));
  transition: border-color .25s ease, background-color .25s ease, transform .25s ease;
}

.page-about .about-jump__list a:hover,
.page-about .about-jump__list a:focus-visible{
  border-color: var(--sj-gold-deep);
  background-color: rgba(201,169,110,.22);
  transform: translateY(-1px);
}

.page-about .about-jump__list .sj-mono{
  color: var(--sj-gold-deep);
  font-size: .74rem;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-ch{
  border-top: 1px solid var(--sj-line-soft);
  scroll-margin-top: 5.5rem;
}

.page-about .about-ch__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.1rem, 3vw, 2.6rem);
}

@media (min-width: 900px){
  .page-about .about-ch__grid{
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.6fr);
    align-items: start;
  }
}

.page-about .about-ch__rail{
  display: flex;
  align-items: baseline;
  gap: .9rem;
}

@media (min-width: 900px){
  .page-about .about-ch__rail{
    flex-direction: column;
    gap: .55rem;
    position: sticky;
    top: 6rem;
  }
}

.page-about .about-ch__num{
  font-family: var(--sj-mono);
  font-weight: 600;
  font-size: clamp(1.9rem, 1.4rem + 2.2vw, 3.1rem);
  line-height: 1;
  letter-spacing: -.03em;
  background: var(--sj-grad-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.page-about .about-ch__rail-label{
  font-family: var(--sj-mono);
  font-size: .74rem;
  letter-spacing: .16em;
  color: var(--sj-gold-deep);
  white-space: nowrap;
}

.page-about .about-ch__body h2{
  font-family: var(--sj-serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 1.15rem + 1.55vw, 2.25rem);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--sj-ink);
  margin: 0 0 1rem;
  max-width: 20ch;
}

.page-about .about-ch__body p{
  margin: 0 0 1rem;
  max-width: 62ch;
}

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

.page-about .about-note{
  margin-top: 1.4rem;
  padding-left: 1rem;
  border-left: 2px solid var(--sj-gold);
  font-size: .92rem;
  color: var(--sj-stone);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure{
  margin: 1.7rem 0 0;
  padding: .5rem;
  border: 1px solid var(--sj-line);
  border-radius: var(--sj-radius);
  background: linear-gradient(150deg, rgba(232,217,190,.95), rgba(245,239,230,.6));
  box-shadow: var(--sj-shadow);
}

.page-about .about-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: calc(var(--sj-radius) - 8px);
}

.page-about .about-figure--wide img{ aspect-ratio: 3 / 2; }
.page-about .about-figure--tall img{ aspect-ratio: 3 / 4; }

.page-about .about-figure figcaption{
  padding: .7rem .35rem .25rem;
  font-family: var(--sj-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--sj-stone);
}

/* 发展节点下的侧栏媒体 */
.page-about .about-ch__aside-media{
  margin-top: clamp(1.8rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: end;
}

@media (min-width: 760px){
  .page-about .about-ch__aside-media{
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.6fr);
  }
}

.page-about .about-ch__aside-media .about-figure{ margin-top: 0; }

.page-about .about-ch__aside-note p{
  margin: 0 0 .8rem;
  max-width: 46ch;
}

.page-about .about-ch__aside-note .sj-meta{
  margin-bottom: .5rem;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline{
  list-style: none;
  position: relative;
  margin: 1.9rem 0 0;
  padding: 0 0 0 2rem;
}

.page-about .about-timeline::before{
  content: "";
  position: absolute;
  left: .5rem;
  top: .6rem;
  bottom: .6rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--sj-gold) 0%, var(--sj-gold-mid) 44%, rgba(139,107,61,.12) 100%);
}

.page-about .about-tl{
  position: relative;
  padding-bottom: 1.85rem;
}

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

.page-about .about-tl::before{
  content: "";
  position: absolute;
  left: -1.78rem;
  top: .62rem;
  width: .6rem;
  height: .6rem;
  background: var(--sj-gold);
  border: 2px solid var(--sj-cream);
  box-shadow: 0 0 0 1px var(--sj-gold-deep);
  border-radius: 1px;
  transform: rotate(45deg);
}

.page-about .about-tl__year{
  display: block;
  font-size: .88rem;
  letter-spacing: .12em;
  color: var(--sj-gold-deep);
}

.page-about .about-tl__title{
  font-family: var(--sj-serif);
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--sj-ink);
  margin: .18rem 0 .32rem;
}

.page-about .about-tl p{
  margin: 0;
  font-size: .93rem;
  max-width: 58ch;
}

/* ---------- 团队角色 ---------- */
.page-about .about-roles{
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: .8rem;
}

@media (min-width: 640px){
  .page-about .about-roles{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-role{
  padding: .95rem 1.05rem;
  border: 1px solid var(--sj-line-soft);
  border-left: 3px solid var(--sj-gold);
  border-radius: 4px var(--sj-radius-sm) var(--sj-radius-sm) 4px;
  background: linear-gradient(155deg, rgba(232,217,190,.7), rgba(245,239,230,.25));
}

.page-about .about-role b{
  display: block;
  font-family: var(--sj-serif);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--sj-ink);
}

.page-about .about-role span{
  display: block;
  margin-top: .3rem;
  font-size: .86rem;
  line-height: 1.7;
}

/* ---------- 折叠面板 ---------- */
.page-about .about-fold{
  margin-top: .8rem;
  padding: 0 1.05rem;
  border: 1px solid var(--sj-line);
  border-radius: var(--sj-radius-sm);
  background: linear-gradient(140deg, rgba(232,217,190,.55), rgba(245,239,230,.85));
}

.page-about .about-fold summary{
  list-style: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: .95rem 0;
  font-family: var(--sj-mono);
  font-size: .85rem;
  letter-spacing: .05em;
  color: var(--sj-ink);
}

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

.page-about .about-fold summary::after{
  content: "+";
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border: 1px solid var(--sj-gold-deep);
  border-radius: 50%;
  color: var(--sj-gold-deep);
  font-size: .95rem;
  line-height: 1;
  transition: transform .25s ease;
}

.page-about .about-fold[open] summary::after{ transform: rotate(45deg); }

.page-about .about-fold p{
  margin: 0;
  padding-bottom: 1rem;
  font-size: .92rem;
  max-width: 60ch;
}

/* ---------- 合作伙伴 ---------- */
.page-about .about-partners__list{
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: .8rem;
}

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

.page-about .about-partner{
  padding: 1.05rem 1.1rem;
  border-radius: var(--sj-radius-sm);
  background: linear-gradient(160deg, var(--sj-ink), var(--sj-ink-soft));
}

.page-about .about-partner b{
  display: block;
  font-family: var(--sj-mono);
  font-weight: 600;
  font-size: 1.4rem;
  letter-spacing: -.02em;
  color: var(--sj-gold);
}

.page-about .about-partner span{
  display: block;
  margin-top: .4rem;
  font-size: .85rem;
  line-height: 1.7;
  color: rgba(245,239,230,.82);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence{
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

.page-about .about-cadence li{
  display: grid;
  grid-template-columns: 1fr;
  gap: .2rem;
  padding-bottom: .75rem;
  border-bottom: 1px dashed var(--sj-line-soft);
  font-size: .94rem;
}

.page-about .about-cadence li:last-child{
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-cadence .sj-mono{
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--sj-gold-deep);
}

@media (min-width: 540px){
  .page-about .about-cadence li{
    grid-template-columns: minmax(6.5rem, auto) minmax(0, 1fr);
    gap: .3rem 1rem;
    align-items: baseline;
  }
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-next{
  padding-block: clamp(2.4rem, 6vw, 4.5rem);
}

.page-about .about-next__box{
  position: relative;
  overflow: hidden;
  padding: clamp(1.6rem, 4vw, 3.2rem);
  border-radius: var(--sj-radius);
  background: var(--sj-ink);
  color: var(--sj-cream);
}

.page-about .about-next__box::after{
  content: "";
  position: absolute;
  right: -14%;
  bottom: -42%;
  width: min(48%, 420px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--sj-grad-gold);
  opacity: .18;
  pointer-events: none;
}

.page-about .about-next__box > *{
  position: relative;
  z-index: 1;
}

.page-about .about-next__box .sj-eyebrow{
  color: var(--sj-gold);
}

.page-about .about-next__box h2{
  font-family: var(--sj-serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.1rem);
  line-height: 1.3;
  color: var(--sj-cream);
  margin: .4rem 0 .85rem;
  max-width: 22ch;
}

.page-about .about-next__box p{
  margin: 0 0 1.5rem;
  max-width: 54ch;
  color: rgba(245,239,230,.84);
}

.page-about .about-next__links{
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

.page-about .about-next__box .sj-btn--ghost{
  color: var(--sj-cream);
  border-color: rgba(201,169,110,.55);
}

.page-about .about-next__box .sj-btn--ghost:hover,
.page-about .about-next__box .sj-btn--ghost:focus-visible{
  border-color: var(--sj-gold);
  background-color: rgba(201,169,110,.16);
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-jump__list a,
  .page-about .about-fold summary::after{
    transition: none;
  }
  .page-about .about-jump__list a:hover{
    transform: none;
  }
}