.page-about{
  background:var(--mist-200);
  color:var(--ink-900);
  font-family:var(--font-sans);
  overflow-x:hidden;
}

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

/* ---------- 封面 ---------- */
.page-about .about-cover{
  position:relative;
  overflow:hidden;
  padding:calc(var(--desk-header-h) + 44px) 0 clamp(44px,7vw,84px);
  background:
    radial-gradient(115% 85% at 88% 4%, rgba(22,217,209,.20), transparent 58%),
    linear-gradient(158deg, var(--abyss-900) 0%, var(--abyss-700) 82%);
  color:var(--white);
}

.page-about .about-cover::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size:96px 96px;
  opacity:.7;
}

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

.page-about .about-cover__crumbs{
  margin-bottom:clamp(26px,4vw,44px);
}

.page-about .about-cover .breadcrumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  font-size:12px;
  letter-spacing:.08em;
}

.page-about .about-cover .breadcrumbs__link{
  color:rgba(255,255,255,.68);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s ease, border-color .2s ease;
}

.page-about .about-cover .breadcrumbs__link:hover,
.page-about .about-cover .breadcrumbs__link:focus-visible{
  color:var(--electric-100);
  border-bottom-color:var(--electric-500);
}

.page-about .about-cover .breadcrumbs__link[aria-current="page"]{
  color:var(--white);
}

.page-about .about-cover .breadcrumbs__sep{
  color:rgba(255,255,255,.35);
}

.page-about .about-cover__kicker{
  color:var(--electric-500);
  font-size:12px;
  letter-spacing:.18em;
  margin:0 0 18px;
}

.page-about .about-cover__title{
  font-family:var(--font-serif);
  font-weight:600;
  font-size:clamp(2rem,6.4vw,4.4rem);
  line-height:1.08;
  letter-spacing:.01em;
  margin:0;
  max-width:20ch;
  text-wrap:balance;
}

.page-about .about-cover__lede{
  margin:clamp(20px,3vw,30px) 0 0;
  max-width:52ch;
  font-size:clamp(1rem,1.5vw,1.125rem);
  line-height:1.85;
  color:rgba(255,255,255,.84);
}

.page-about .about-cover__facts{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px 18px;
  margin:clamp(30px,5vw,46px) 0 0;
  padding-top:clamp(20px,3vw,28px);
  border-top:1px solid rgba(255,255,255,.16);
}

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

.page-about .about-fact__label{
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(255,255,255,.62);
  margin:0 0 6px;
}

.page-about .about-fact__num{
  margin:0;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:clamp(1.35rem,2.6vw,1.9rem);
  letter-spacing:.06em;
  color:var(--electric-500);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index{
  background:var(--cream-100);
  border-bottom:1px solid var(--line-300);
}

.page-about .about-index__inner{
  display:flex;
  align-items:center;
  gap:16px;
  padding-top:14px;
  padding-bottom:14px;
}

.page-about .about-index__label{
  flex:0 0 auto;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--ink-600);
  display:none;
}

.page-about .about-index__list{
  display:flex;
  gap:8px;
  margin:0;
  padding:2px 2px 6px;
  list-style:none;
  overflow-x:auto;
  scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;
}

.page-about .about-index__link{
  display:inline-block;
  white-space:nowrap;
  scroll-snap-align:start;
  padding:8px 14px;
  font-size:13px;
  color:var(--abyss-700);
  text-decoration:none;
  border:1px solid var(--line-300);
  border-radius:2px;
  background:transparent;
  transition:border-color .2s ease, background-color .2s ease, color .2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible{
  border-color:var(--electric-500);
  background:var(--electric-100);
  color:var(--abyss-900);
  outline:none;
}

.page-about .about-index__link:focus-visible{
  box-shadow:0 0 0 3px rgba(22,217,209,.45);
}

/* ---------- 章节通用 ---------- */
.page-about .about-chapter{
  padding:clamp(46px,7vw,92px) 0;
  border-bottom:1px solid var(--line-300);
}

.page-about .about-chapter--last{
  border-bottom:0;
  padding-bottom:clamp(56px,8vw,104px);
}

.page-about .about-chapter__head{
  display:grid;
  gap:18px;
  margin-bottom:clamp(28px,4vw,44px);
}

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

.page-about .about-chapter__title{
  font-family:var(--font-serif);
  font-weight:600;
  font-size:clamp(1.5rem,3.4vw,2.35rem);
  line-height:1.25;
  letter-spacing:.01em;
  margin:0 0 14px;
  color:var(--abyss-900);
}

.page-about .about-chapter__text{
  margin:0;
  max-width:56ch;
  font-size:16px;
  line-height:1.8;
  color:var(--ink-600);
}

/* ---------- 双栏错位 ---------- */
.page-about .about-split{
  display:grid;
  gap:clamp(26px,4vw,42px);
  align-items:start;
}

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

.page-about .about-split__body p{
  margin:0 0 18px;
  max-width:60ch;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-900);
}

.page-about .about-split__note{
  margin:6px 0 0;
  padding-left:14px;
  border-left:2px solid var(--coral-500);
  font-size:14px;
  line-height:1.75;
  color:var(--ink-600);
}

.page-about .about-split__note .mono{
  font-family:var(--font-mono);
  letter-spacing:.06em;
  color:var(--abyss-700);
}

.page-about .about-split__aside{
  margin:0;
  min-width:0;
}

.page-about .about-split .media-frame__caption{
  font-size:12px;
  color:var(--ink-600);
  margin-top:10px;
  letter-spacing:.04em;
}

/* ---------- 奶油阅读面板 ---------- */
.page-about .about-panel{
  background:var(--cream-100);
  border:1px solid var(--line-300);
  border-radius:2px;
  padding:clamp(20px,4vw,44px);
  box-shadow:0 24px 46px -40px rgba(7,26,43,.75);
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl{
  position:relative;
  margin:0;
  padding:2px 0 0 26px;
  list-style:none;
}

.page-about .about-tl::before{
  content:"";
  position:absolute;
  left:7px;
  top:12px;
  bottom:14px;
  width:1px;
  background:linear-gradient(180deg, var(--electric-500), rgba(169,183,193,.7));
}

.page-about .about-tl__item{
  position:relative;
  padding:0 0 clamp(22px,3vw,32px);
}

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

.page-about .about-tl__item::before{
  content:"";
  position:absolute;
  left:-25px;
  top:9px;
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--cream-100);
  border:1px solid var(--electric-500);
  transition:transform .2s ease, background-color .2s ease, box-shadow .2s ease;
}

.page-about .about-tl__item:last-child::before{
  background:var(--coral-500);
  border-color:var(--coral-500);
  box-shadow:0 0 0 4px rgba(255,107,74,.16);
}

.page-about .about-tl__item:hover::before,
.page-about .about-tl__item:focus-within::before{
  transform:scale(1.35);
  background:var(--electric-500);
  border-color:var(--electric-500);
  box-shadow:0 0 0 4px rgba(22,217,209,.18);
}

.page-about .about-tl__year{
  display:block;
  font-size:clamp(1.05rem,2.2vw,1.4rem);
  letter-spacing:.08em;
  color:var(--coral-500);
  margin-bottom:4px;
}

.page-about .about-tl__title{
  font-family:var(--font-sans);
  font-weight:700;
  font-size:16px;
  letter-spacing:.03em;
  margin:0 0 6px;
  color:var(--abyss-900);
}

.page-about .about-tl__text{
  margin:0;
  max-width:62ch;
  font-size:15px;
  line-height:1.8;
  color:var(--ink-600);
}

.page-about .about-tl__item:hover .about-tl__title,
.page-about .about-tl__item:focus-within .about-tl__title{
  color:var(--abyss-700);
  text-decoration:underline;
  text-decoration-color:var(--electric-500);
  text-underline-offset:4px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-team{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:clamp(18px,3vw,26px);
}

.page-about .about-meter{
  padding:0 0 14px;
  border-bottom:1px solid var(--line-300);
}

.page-about .about-meter__head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  margin-bottom:6px;
}

.page-about .about-meter__label{
  font-family:var(--font-sans);
  font-weight:700;
  font-size:15px;
  letter-spacing:.04em;
  color:var(--abyss-900);
}

.page-about .about-meter__value{
  font-size:14px;
  letter-spacing:.06em;
  color:var(--coral-500);
  white-space:nowrap;
}

.page-about .about-meter__text{
  margin:0 0 12px;
  font-size:14px;
  line-height:1.8;
  color:var(--ink-600);
}

.page-about .about-meter__track{
  height:4px;
  background:rgba(169,183,193,.42);
  border-radius:2px;
  overflow:hidden;
}

.page-about .about-meter__fill{
  display:block;
  height:100%;
  border-radius:2px;
  background:linear-gradient(90deg, var(--abyss-700), var(--electric-500));
}

.page-about .about-meter--c1 .about-meter__fill{width:43%;}
.page-about .about-meter--c2 .about-meter__fill{width:33%;}
.page-about .about-meter--c3 .about-meter__fill{width:24%;}

/* ---------- 合作生态 ---------- */
.page-about .about-partners{
  display:grid;
  gap:clamp(26px,4vw,42px);
  align-items:start;
}

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

.page-about .about-partners__figure .media-frame__caption{
  font-size:12px;
  color:var(--ink-600);
  margin-top:10px;
  letter-spacing:.04em;
}

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

.page-about .about-node{
  display:grid;
  grid-template-columns:56px minmax(0,1fr);
  gap:14px;
  padding:18px 12px;
  border-top:1px solid var(--line-300);
  transition:background-color .2s ease, border-color .2s ease;
}

.page-about .about-node:last-child{
  border-bottom:1px solid var(--line-300);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within{
  background:rgba(201,251,247,.55);
  border-top-color:var(--electric-500);
}

.page-about .about-node__num{
  font-size:clamp(1.3rem,2.6vw,1.75rem);
  line-height:1.1;
  letter-spacing:.04em;
  color:var(--abyss-700);
}

.page-about .about-node--honor .about-node__num{
  color:var(--coral-500);
}

.page-about .about-node__title{
  font-family:var(--font-sans);
  font-weight:700;
  font-size:15px;
  letter-spacing:.04em;
  margin:0 0 6px;
  color:var(--abyss-900);
}

.page-about .about-node__text{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:var(--ink-600);
  max-width:54ch;
}

/* ---------- 服务承诺 ---------- */
.page-about .about-panel--dark{
  background:
    radial-gradient(90% 120% at 92% 0%, rgba(22,217,209,.16), transparent 60%),
    linear-gradient(160deg, var(--abyss-900), var(--abyss-700));
  border-color:rgba(22,217,209,.35);
  color:var(--white);
  box-shadow:0 30px 60px -46px rgba(7,26,43,.9);
}

.page-about .about-stats{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:22px 18px;
  margin:0 0 clamp(22px,4vw,34px);
  padding:0 0 clamp(20px,3vw,28px);
  border-bottom:1px solid rgba(255,255,255,.16);
}

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

.page-about .about-stat__label{
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(255,255,255,.62);
  margin:0 0 6px;
}

.page-about .about-stat__num{
  margin:0;
  font-size:clamp(1.3rem,3vw,2rem);
  letter-spacing:.05em;
  color:var(--electric-500);
}

.page-about .about-assure{
  margin:0;
  padding:0;
  list-style:none;
  display:grid;
  gap:12px;
}

.page-about .about-assure__item{
  position:relative;
  padding-left:18px;
  font-size:15px;
  line-height:1.8;
  color:rgba(255,255,255,.85);
}

.page-about .about-assure__item::before{
  content:"";
  position:absolute;
  left:0;
  top:11px;
  width:7px;
  height:7px;
  border-radius:50%;
  border:1px solid var(--electric-500);
}

/* ---------- 档案索引 ---------- */
.page-about .about-archive{
  display:grid;
  gap:14px;
}

.page-about .about-archive__link{
  position:relative;
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  grid-template-areas:
    "num title arrow"
    "num text arrow";
  column-gap:14px;
  align-items:start;
  padding:20px 18px;
  background:var(--white);
  border:1px solid var(--line-300);
  border-radius:2px;
  text-decoration:none;
  color:var(--ink-900);
  box-shadow:0 18px 34px -34px rgba(7,26,43,.8);
  transition:transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}

.page-about .about-archive__link:hover,
.page-about .about-archive__link:focus-visible{
  transform:translateY(-2px);
  border-color:var(--electric-500);
  box-shadow:0 22px 38px -30px rgba(7,26,43,.85);
  outline:none;
}

.page-about .about-archive__link:focus-visible{
  box-shadow:0 0 0 3px rgba(22,217,209,.5);
}

.page-about .about-archive__num{
  grid-area:num;
  font-size:12px;
  letter-spacing:.1em;
  color:var(--coral-500);
  padding-top:3px;
}

.page-about .about-archive__title{
  grid-area:title;
  font-family:var(--font-sans);
  font-weight:700;
  font-size:16px;
  letter-spacing:.04em;
  color:var(--abyss-900);
  margin-bottom:4px;
}

.page-about .about-archive__text{
  grid-area:text;
  font-size:14px;
  line-height:1.8;
  color:var(--ink-600);
}

.page-about .about-archive__arrow{
  grid-area:arrow;
  align-self:center;
  font-size:16px;
  color:var(--line-300);
  transition:color .2s ease, transform .2s ease;
}

.page-about .about-archive__link:hover .about-archive__arrow,
.page-about .about-archive__link:focus-visible .about-archive__arrow{
  color:var(--coral-500);
  transform:translateX(3px);
}

/* ---------- 中等屏 ---------- */
@media (min-width:720px){
  .page-about .about-cover__facts{
    grid-template-columns:repeat(4,minmax(0,1fr));
  }

  .page-about .about-index__label{
    display:block;
  }

  .page-about .about-stats{
    grid-template-columns:repeat(4,minmax(0,1fr));
    gap:18px;
  }

  .page-about .about-archive{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:16px;
  }
}

/* ---------- 桌面错位双栏 ---------- */
@media (min-width:960px){
  .page-about .about-chapter__head{
    grid-template-columns:200px minmax(0,1fr);
    gap:clamp(24px,4vw,56px);
    align-items:start;
  }

  .page-about .about-chapter__intro{
    padding-top:4px;
  }

  .page-about .about-split{
    grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);
    gap:clamp(32px,5vw,64px);
  }

  .page-about .about-split__aside{
    margin-top:32px;
  }

  .page-about .about-split--reverse{
    grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);
  }

  .page-about .about-split--reverse .about-split__aside{
    margin-top:0;
    order:0;
  }

  .page-about .about-split--reverse .about-split__body{
    order:1;
  }

  .page-about .about-partners{
    grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
    gap:clamp(32px,5vw,64px);
  }

  .page-about .about-partners__figure{
    margin-top:24px;
  }

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

  .page-about .about-tl::before{
    left:9px;
  }

  .page-about .about-tl__item{
    display:grid;
    grid-template-columns:110px minmax(0,1fr);
    gap:clamp(16px,3vw,32px);
  }

  .page-about .about-tl__item::before{
    left:-30px;
    top:8px;
    width:11px;
    height:11px;
  }

  .page-about .about-tl__year{
    margin-bottom:0;
  }

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

  .page-about .about-archive__link:nth-child(2){
    margin-top:28px;
  }

  .page-about .about-archive__link:nth-child(4){
    margin-top:28px;
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  .page-about *{
    transition:none !important;
    animation:none !important;
  }

  .page-about .about-archive__link:hover,
  .page-about .about-archive__link:focus-visible{
    transform:none;
  }

  .page-about .about-tl__item:hover::before,
  .page-about .about-tl__item:focus-within::before{
    transform:none;
  }

  .page-about .about-archive__link:hover .about-archive__arrow,
  .page-about .about-archive__link:focus-visible .about-archive__arrow{
    transform:none;
  }
}