.page-about{
  --about-rail:232px;
  --about-gap:clamp(20px,3.4vw,52px);
  --about-ease:cubic-bezier(0,0,.2,1);
  display:block;
  padding-bottom:clamp(48px,7vw,96px);
}

/* ---------- 标题区 ---------- */
.page-about .page-head{
  max-width:var(--maxw-wide);
  margin:0 auto;
  padding:clamp(28px,4.6vw,60px) var(--pad-x) clamp(18px,2.6vw,28px);
}
.page-about .breadcrumb{ margin:0 0 clamp(18px,3vw,30px); }
.page-about h1{
  margin:.35em 0 0;
  max-width:20em;
  font-size:clamp(29px,5.2vw,56px);
  line-height:1.17;
  font-weight:900;
  letter-spacing:-.025em;
  color:var(--paper-100);
  text-shadow:0 0 12px rgba(216,168,62,.18);
}
.page-about .about-lede{
  margin:16px 0 22px;
  max-width:40em;
  font-size:clamp(15px,1.5vw,17px);
  line-height:1.9;
  letter-spacing:.01em;
  color:var(--paper-soft);
}

/* ---------- 通栏主图 ---------- */
.page-about .about-hero{
  max-width:var(--maxw-wide);
  margin:0 auto clamp(30px,4.6vw,58px);
  padding:0 var(--pad-x);
}
.page-about .shot{
  margin:0;
  border:1px solid var(--line-700);
  background:var(--felt-800);
  overflow:hidden;
}
.page-about .shot img{
  display:block;
  width:100%;
  max-width:100%;
  height:auto;
  object-fit:cover;
}
.page-about .shot--16x9 img{ aspect-ratio:16 / 9; }
.page-about .shot--1x1 img{ aspect-ratio:1 / 1; }
.page-about .shot--3x2 img{ aspect-ratio:3 / 2; }
.page-about .shot--inset{ margin:clamp(28px,4vw,48px) 0 0; }
.page-about .cap{
  margin:10px 0 0;
  font-size:13px;
  line-height:1.72;
  letter-spacing:.01em;
  color:var(--mist-400);
}

/* ---------- 摘要与边界 ---------- */
.page-about .about-summary{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--pad-x) clamp(34px,5vw,60px);
  display:grid;
  gap:16px;
}
.page-about .about-summary__lead{
  margin:0;
  max-width:24em;
  font-size:clamp(19px,2.4vw,27px);
  font-weight:800;
  line-height:1.55;
  letter-spacing:-.015em;
  color:var(--paper-100);
}
.page-about .about-summary__edge{
  margin:0;
  max-width:46em;
  padding-left:14px;
  border-left:1px solid var(--gold-500);
  font-size:15px;
  line-height:1.9;
  letter-spacing:.01em;
  color:var(--mist-400);
}

/* ---------- 双栏骨架 ---------- */
.page-about .board{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--pad-x);
  display:grid;
  gap:var(--about-gap);
  align-items:start;
}
@media (min-width:960px){
  .page-about .board{ grid-template-columns:var(--about-rail) minmax(0,1fr); }
}

/* ---------- 左栏索引 ---------- */
.page-about .board__rail{
  border:1px solid var(--line-700);
  background:var(--ink-900);
  padding:16px 16px 18px;
}
.page-about .board__rail .eyebrow{
  margin:0 0 10px;
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mist-400);
}
.page-about .rail-list{
  list-style:none;
  margin:0 0 22px;
  padding:0;
  display:grid;
}
.page-about .rail-list:last-child{ margin-bottom:0; }
.page-about .rail-list a{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:8px 0;
  font-size:14px;
  color:var(--mist-400);
  text-decoration:none;
  border-bottom:1px solid var(--line-700);
  transition:color .12s var(--about-ease), border-color .12s var(--about-ease);
}
.page-about .rail-list li:last-child a{ border-bottom:0; }
.page-about .rail-list a:hover{
  color:var(--paper-100);
  border-bottom-color:var(--gold-500);
}
.page-about .rail-list a .mono{
  color:var(--gold-500);
  font-size:12px;
  letter-spacing:.06em;
}
@media (max-width:959px){
  .page-about .rail-list{ grid-template-columns:repeat(2,minmax(0,1fr)); gap:0 20px; }
  .page-about .board__rail{ padding:16px 16px 8px; }
  .page-about .board__rail .eyebrow{ grid-column:1 / -1; }
}
@media (min-width:960px){
  .page-about .board__rail{
    position:sticky;
    top:22px;
    border:0;
    border-top:1px solid var(--gold-500);
    background:transparent;
    padding:14px 0 0;
  }
}

/* ---------- 叙述主体 ---------- */
.page-about .block{
  padding:clamp(34px,5.4vw,64px) 0 0;
  border-top:1px solid var(--line-700);
}
.page-about .block:first-child{
  border-top:0;
  padding-top:0;
}
.page-about .block h2{
  margin:10px 0 18px;
  max-width:20em;
  font-size:clamp(21px,3vw,32px);
  line-height:1.3;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--paper-100);
  text-shadow:0 0 12px rgba(216,168,62,.18);
}
.page-about .about-p{
  margin:0 0 14px;
  max-width:42em;
  font-size:16.5px;
  line-height:1.92;
  letter-spacing:.01em;
  color:var(--paper-soft);
}

/* ---------- 阶段色带 ---------- */
.page-about .phase-strip{
  list-style:none;
  margin:26px 0 0;
  padding:0;
  border-top:1px solid var(--line-700);
}
.page-about .phase-strip__item{
  padding:18px 0;
  border-bottom:1px solid var(--line-700);
  scroll-margin-top:26px;
}
.page-about .phase-strip__link{
  display:flex;
  align-items:baseline;
  gap:12px;
  font-size:17px;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--paper-100);
  text-decoration:none;
  transition:color .12s var(--about-ease);
}
.page-about .phase-strip__link:hover{ color:var(--gold-500); }
.page-about .phase-strip__num{
  font-size:12px;
  font-weight:400;
  letter-spacing:.1em;
  color:var(--gold-500);
}
.page-about .phase-strip__bar{
  display:block;
  height:3px;
  margin:12px 0;
  background:var(--gold-500);
  transition:background-color .12s var(--about-ease), opacity .12s var(--about-ease);
}
.page-about .phase-strip__bar--1{ width:26%; background:var(--line-700); opacity:1; }
.page-about .phase-strip__bar--2{ width:48%; opacity:.36; }
.page-about .phase-strip__bar--3{ width:72%; opacity:.66; }
.page-about .phase-strip__bar--4{ width:100%; opacity:1; }
.page-about .phase-strip__item:target .phase-strip__bar{
  background:var(--gold-500);
  opacity:1;
}
.page-about .phase-strip__item:target .phase-strip__link{ color:var(--gold-500); }
.page-about .phase-strip__text{
  margin:0;
  max-width:40em;
  font-size:15px;
  line-height:1.9;
  letter-spacing:.01em;
  color:var(--mist-400);
}

/* ---------- 同心直角示意 ---------- */
.page-about .rings{
  margin:26px 0 0;
  padding:0;
}
.page-about .rings__outer{
  border:1px solid var(--line-700);
  background:var(--ink-900);
  padding:clamp(14px,2.4vw,24px);
  transition:border-color .12s var(--about-ease);
}
.page-about .rings__outer:hover{ border-color:var(--gold-500); }
.page-about .rings__label{
  margin:0 0 12px;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--mist-400);
}
.page-about .rings__cells{
  list-style:none;
  margin:0 0 16px;
  padding:0;
  display:grid;
  grid-template-columns:repeat(6,minmax(0,1fr));
  gap:6px;
}
.page-about .rings__cells li{
  padding:8px 0;
  text-align:center;
  border:1px solid var(--line-700);
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  color:var(--gold-500);
  transition:border-color .12s var(--about-ease), color .12s var(--about-ease);
}
.page-about .rings__cells:hover li{ border-color:var(--gold-500); }
.page-about .rings__inner{
  border:1px solid var(--line-700);
  padding:14px 16px;
  transition:border-color .12s var(--about-ease);
}
.page-about .rings__inner:hover{ border-color:var(--gold-500); }
.page-about .rings__hint{
  margin:0;
  font-size:14px;
  line-height:1.8;
  color:var(--paper-soft);
}
@media (max-width:560px){
  .page-about .rings__cells{ grid-template-columns:repeat(4,minmax(0,1fr)); }
}

/* ---------- 三级收录条形 ---------- */
.page-about .tier-bars{
  margin:24px 0 6px;
  display:grid;
  gap:12px;
}
.page-about .tier-bars__row{
  display:grid;
  grid-template-columns:minmax(84px,114px) minmax(0,1fr) 42px;
  align-items:center;
  gap:12px;
}
.page-about .tier-bars__key{
  font-size:13.5px;
  letter-spacing:.02em;
  color:var(--paper-soft);
}
.page-about .tier-bars__track{
  display:block;
  height:10px;
  border:1px solid var(--line-700);
  background:var(--ink-950);
}
.page-about .tier-bars__fill{
  display:block;
  height:100%;
  transition:opacity .12s var(--about-ease);
}
.page-about .tier-bars__fill--a{ width:84%; background:var(--gold-500); }
.page-about .tier-bars__fill--b{ width:16%; background:var(--mist-400); }
.page-about .tier-bars__fill--c{ width:100%; background:var(--line-700); }
.page-about .tier-bars__row:hover .tier-bars__fill{ opacity:.7; }
.page-about .tier-bars__val{
  text-align:right;
  font-size:15px;
  font-variant-numeric:tabular-nums;
  color:var(--gold-500);
}
.page-about .tier-bars__row--total .tier-bars__val{ color:var(--mist-400); }

/* ---------- 收录检查清单 ---------- */
.page-about .checks{
  list-style:none;
  margin:28px 0 22px;
  padding:0;
  border-top:1px solid var(--line-700);
}
.page-about .checks__item{
  display:grid;
  grid-template-columns:34px minmax(0,1fr);
  gap:2px 12px;
  padding:13px 12px 13px 0;
  border-bottom:1px solid var(--line-700);
  transition:background-color .18s var(--about-ease);
}
.page-about .checks__item:hover{ background:var(--ink-900); }
.page-about .checks__no{
  grid-column:1;
  grid-row:1 / span 2;
  padding-top:3px;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--gold-500);
}
.page-about .checks__name{
  grid-column:2;
  grid-row:1;
  font-size:15px;
  font-weight:700;
  color:var(--paper-100);
}
.page-about .checks__note{
  grid-column:2;
  grid-row:2;
  margin:0;
  font-size:13.5px;
  line-height:1.78;
  color:var(--mist-400);
}

/* ---------- 角色分工 ---------- */
.page-about .roles{
  list-style:none;
  margin:26px 0 0;
  padding:0;
  border-top:1px solid var(--line-700);
}
.page-about .roles__item{
  display:grid;
  gap:8px;
  padding:20px 0;
  border-bottom:1px solid var(--line-700);
}
.page-about .roles__item h3{
  margin:0;
  font-size:17px;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--paper-100);
}
.page-about .roles__item p{
  margin:0;
  max-width:40em;
  font-size:15px;
  line-height:1.9;
  color:var(--mist-400);
}
.page-about .roles__item .roles__key{
  margin:0;
  font-size:11px;
  letter-spacing:.16em;
  color:var(--gold-500);
}

/* ---------- 运营事实表 ---------- */
.page-about .region-facts{
  margin:24px 0 0;
  padding:0;
  display:grid;
  grid-template-columns:1fr;
  border-top:1px solid var(--line-700);
}
@media (min-width:660px){
  .page-about .region-facts{ grid-template-columns:repeat(2,minmax(0,1fr)); }
}
.page-about .region-facts > div{
  display:grid;
  grid-template-columns:94px minmax(0,1fr);
  gap:12px;
  padding:13px 0;
  border-bottom:1px solid var(--line-700);
}
@media (min-width:660px){
  .page-about .region-facts > div{ padding-right:24px; }
}
.page-about .region-facts dt{
  font-size:13px;
  letter-spacing:.04em;
  color:var(--mist-400);
}
.page-about .region-facts dd{
  margin:0;
  font-size:14.5px;
  line-height:1.78;
  color:var(--paper-100);
}

/* ---------- 术语三联表 ---------- */
.page-about .terms{
  list-style:none;
  margin:24px 0 0;
  padding:0;
  border-top:1px solid var(--line-700);
}
.page-about .terms__row{
  display:grid;
  grid-template-columns:minmax(0,1fr) 32px 96px;
  align-items:baseline;
  gap:6px 14px;
  padding:12px 0;
  border-bottom:1px solid var(--line-700);
  transition:background-color .18s var(--about-ease);
}
.page-about .terms__row:hover,
.page-about .terms__row:focus-within{ background:var(--ink-900); }
.page-about .terms__zh{
  font-size:15.5px;
  font-weight:700;
  letter-spacing:.01em;
  color:var(--paper-100);
}
.page-about .terms__py{
  font-size:13px;
  letter-spacing:.1em;
  text-align:center;
  color:var(--jade-500);
}
.page-about .terms__no{
  font-size:13px;
  font-variant-numeric:tabular-nums;
  text-align:right;
  color:var(--mist-400);
}
.page-about .terms__note{
  grid-column:1 / -1;
  margin:0;
  max-height:0;
  opacity:0;
  overflow:hidden;
  font-size:13.5px;
  line-height:1.78;
  color:var(--mist-400);
  transition:max-height .18s var(--about-ease), opacity .18s var(--about-ease), margin-top .18s var(--about-ease);
}
.page-about .terms__row:hover .terms__note,
.page-about .terms__row:focus-within .terms__note{
  max-height:6em;
  opacity:1;
  margin-top:4px;
}
@media (max-width:700px){
  .page-about .terms__row{
    grid-template-columns:minmax(0,1fr) 26px 74px;
    gap:4px 10px;
  }
  .page-about .terms__note{
    max-height:none;
    opacity:1;
    margin-top:4px;
  }
}

/* ---------- 延伸阅读 ---------- */
.page-about .readon{
  margin:clamp(32px,4.4vw,54px) 0 0;
  padding:20px 0 0;
  border-top:1px solid var(--gold-500);
}
.page-about .readon .eyebrow{
  margin:0 0 6px;
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mist-400);
}
.page-about .readon__list{
  list-style:none;
  margin:0;
  padding:0;
}
.page-about .readon__list li{ border-bottom:1px solid var(--line-700); }
.page-about .readon__list a{
  display:block;
  padding:13px 0;
  font-size:15px;
  letter-spacing:.01em;
  color:var(--paper-soft);
  text-decoration:none;
  border-left:0;
  transition:color .12s var(--about-ease), padding-left .14s ease-out;
}
.page-about .readon__list a:hover{
  color:var(--gold-500);
  padding-left:8px;
}