.page-about{display:block}

/* ---------- 首屏 ---------- */
.page-about .mission-hero{
  position:relative;
  overflow:hidden;
  padding:22px 0 clamp(36px,5vw,64px);
  border-bottom:2px solid var(--line);
  background:
    radial-gradient(90% 70% at 8% 0%, rgba(18,194,106,.20), transparent 60%),
    radial-gradient(85% 65% at 96% 4%, rgba(46,125,255,.24), transparent 62%),
    var(--ink);
}
.page-about .mission-hero::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(115deg, rgba(79,216,232,.06) 0 2px, transparent 2px 88px);
  pointer-events:none;
}
.page-about .mission-hero > .shell{position:relative;z-index:1}
.page-about .mission-hero .crumbs{color:var(--muted);font-family:var(--font-mono);font-size:12px}
.page-about .mission-hero .crumbs a{color:var(--muted);text-decoration:none}
.page-about .mission-hero .crumbs a:hover{color:var(--grass)}
.page-about .mission-hero .crumb-sep{margin:0 8px;color:var(--line)}

.page-about .hero-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(22px,3vw,44px);
  margin-top:20px;
}
.page-about .hero-kicker{
  margin:0;
  font-size:12px;
  letter-spacing:.24em;
  color:var(--grass);
  text-transform:uppercase;
}
.page-about .hero-title{
  margin:.24em 0 .5em;
  font-size:clamp(32px,5.6vw,68px);
  line-height:1.06;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--text);
}
.page-about .hero-lead{
  margin:0;
  max-width:60ch;
  font-size:var(--fs-18);
  line-height:1.78;
  color:var(--text);
  opacity:.86;
}
.page-about .hero-copy .btn-row{margin-top:clamp(18px,2.4vw,28px)}

.page-about .hero-panel{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  background:var(--panel);
  border:2px solid var(--line);
  box-shadow:var(--hard);
  overflow:hidden;
}
.page-about .hero-panel::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:4px;
  background:linear-gradient(90deg,var(--grass),var(--data) 55%,var(--cyan));
}
.page-about .hero-panel-label{
  margin:6px 0 0;
  font-size:12px;
  letter-spacing:.2em;
  color:var(--muted);
}
.page-about .hero-panel-value{
  margin:.18em 0 .1em;
  font-size:clamp(42px,6vw,62px);
  line-height:1;
  font-weight:700;
  color:var(--grass);
  letter-spacing:-.03em;
}
.page-about .hero-panel-note{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}
.page-about .hero-facts{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:14px;
  margin:20px 0 0;
  padding-top:16px;
  border-top:1px dashed var(--line);
}
.page-about .hero-facts dt{
  font-size:12px;
  color:var(--muted);
  letter-spacing:.06em;
}
.page-about .hero-facts dd{
  margin:6px 0 0;
  font-size:var(--fs-24);
  color:var(--text);
  letter-spacing:-.01em;
}
.page-about .hero-media{margin:clamp(26px,3.6vw,46px) 0 0}
.page-about .hero-media .media-frame{border:2px solid var(--line);box-shadow:var(--hard)}
.page-about .media-frame img{display:block;width:100%;height:auto;object-fit:cover}

/* ---------- 章节骨架 ---------- */
.page-about .mission-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:var(--gap);
  padding:clamp(30px,4vw,56px) 0 clamp(40px,5vw,72px);
}
.page-about .mission-rail{display:none}
.page-about .mission-body{min-width:0}

/* ---------- 章节 ---------- */
.page-about .chapter{
  padding:clamp(26px,3.4vw,46px) 0;
  border-top:2px solid var(--line);
}
.page-about .chapter:first-child{border-top:none;padding-top:0}
.page-about .chapter-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  align-items:center;
  gap:14px;
  margin-bottom:clamp(14px,2vw,22px);
}
.page-about .chapter-num{
  font-size:clamp(34px,5.4vw,60px);
  line-height:.9;
  letter-spacing:-.05em;
  color:var(--panel-2);
  -webkit-text-stroke:2px var(--grass-deep);
}
.page-about .chapter-title{
  margin:0;
  font-size:var(--fs-36);
  line-height:1.14;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--text);
}
.page-about .chapter-note{
  display:none;
  writing-mode:vertical-rl;
  font-size:12px;
  letter-spacing:.3em;
  color:var(--muted);
}
.page-about .chapter-lead{
  margin:0 0 clamp(18px,2.4vw,28px);
  max-width:62ch;
  font-size:var(--fs-18);
  line-height:1.78;
  color:var(--text);
  opacity:.84;
}

/* ---------- 三条业务主线 ---------- */
.page-about .fact-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:var(--gap);
}
.page-about .fact-cell{
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:clamp(16px,2vw,22px);
  background:var(--panel);
  border:2px solid var(--line);
  border-top-width:6px;
  box-shadow:var(--hard-sm);
}
.page-about .fact-cell:nth-child(1){border-top-color:var(--grass)}
.page-about .fact-cell:nth-child(2){border-top-color:var(--data)}
.page-about .fact-cell:nth-child(3){border-top-color:var(--flare)}
.page-about .fact-title{
  margin:0;
  font-size:22px;
  font-weight:700;
  color:var(--text);
  letter-spacing:-.01em;
}
.page-about .fact-text{
  margin:0;
  font-size:15px;
  line-height:1.75;
  color:var(--muted);
}

/* ---------- 流程条 ---------- */
.page-about .flow-bar{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:14px;
  margin-bottom:clamp(22px,3vw,34px);
}
.page-about .flow-node{
  position:relative;
  padding:16px;
  background:var(--panel);
  border:2px solid var(--line);
  box-shadow:var(--hard-sm);
  transition:transform .28s cubic-bezier(.22,1,.36,1), border-color .28s ease;
}
.page-about .flow-index{
  margin:0;
  font-size:12px;
  letter-spacing:.18em;
  color:var(--grass);
}
.page-about .flow-name{
  margin:.4em 0 .3em;
  font-size:20px;
  font-weight:700;
  color:var(--text);
}
.page-about .flow-meta{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}
.page-about .flow-tip{
  margin:10px 0 0;
  padding-top:9px;
  border-top:1px dashed var(--line);
  font-size:13px;
  line-height:1.65;
  color:var(--muted);
  opacity:.78;
  transition:opacity .28s ease, color .28s ease;
}
.page-about .flow-node:hover,
.page-about .flow-node:focus-within{
  transform:translateY(-4px);
  border-color:var(--grass);
}
.page-about .flow-node:hover .flow-tip,
.page-about .flow-node:focus-within .flow-tip{
  opacity:1;
  color:var(--text);
}

/* ---------- V4 四标准 ---------- */
.page-about .standard-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(16px,2.2vw,26px);
  padding-bottom:6px;
}
.page-about .standard{
  position:relative;
  padding:clamp(16px,2.2vw,24px) clamp(16px,2.2vw,24px) clamp(16px,2.2vw,24px) calc(clamp(16px,2.2vw,24px) + 10px);
  background:var(--panel);
  border:2px solid var(--line);
  box-shadow:var(--hard-sm);
}
.page-about .standard::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:6px;
}
.page-about .standard--grass::before{background:var(--grass)}
.page-about .standard--data::before{background:var(--data)}
.page-about .standard--cyan::before{background:var(--cyan)}
.page-about .standard--flare::before{background:var(--flare)}
.page-about .standard-key{
  margin:0;
  font-size:12px;
  letter-spacing:.2em;
  color:var(--muted);
}
.page-about .standard-title{
  margin:.45em 0 .5em;
  font-size:var(--fs-24);
  font-weight:700;
  color:var(--text);
  letter-spacing:-.01em;
}
.page-about .standard-text{
  margin:0;
  font-size:15px;
  line-height:1.78;
  color:var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:var(--gap);
  margin-bottom:clamp(22px,3vw,34px);
}
.page-about .team-cell{
  padding:16px;
  background:var(--panel-2);
  border:2px solid var(--line);
}
.page-about .team-count{
  margin:0;
  font-family:var(--font-mono);
  font-size:clamp(28px,3.4vw,40px);
  line-height:1;
  font-weight:700;
  color:var(--grass);
  letter-spacing:-.03em;
}
.page-about .team-role{
  margin:10px 0 6px;
  font-size:16px;
  font-weight:700;
  color:var(--text);
}
.page-about .team-desc{
  margin:0;
  font-size:14px;
  line-height:1.7;
  color:var(--muted);
}

/* ---------- 里程碑时间轴 ---------- */
.page-about .timeline{
  list-style:none;
  margin:0;
  padding:4px 0 4px 28px;
  position:relative;
}
.page-about .timeline::before{
  content:"";
  position:absolute;
  left:5px;
  top:8px;
  bottom:8px;
  width:2px;
  background:linear-gradient(180deg,var(--grass),var(--data) 60%,var(--line));
}
.page-about .milestone{
  position:relative;
  margin-bottom:14px;
}
.page-about .milestone:last-child{margin-bottom:0}
.page-about .milestone::before{
  content:"";
  position:absolute;
  left:-28px;
  top:16px;
  width:12px;
  height:12px;
  background:var(--ink);
  border:2px solid var(--grass);
  transform:rotate(45deg);
}
.page-about .milestone:first-child::before{background:var(--grass)}
.page-about .ms summary{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 14px;
  padding:14px 16px;
  cursor:pointer;
  background:var(--panel);
  border:2px solid var(--line);
  list-style:none;
  transition:border-color .28s ease, background .28s ease;
}
.page-about .ms summary::-webkit-details-marker{display:none}
.page-about .ms summary::after{
  content:"+";
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:18px;
  color:var(--grass);
}
.page-about .ms[open] summary::after{content:"–"}
.page-about .ms summary:hover{border-color:var(--grass)}
.page-about .ms[open] summary{
  border-color:var(--grass);
  background:var(--panel-2);
}
.page-about .ms-stage{
  font-size:12px;
  letter-spacing:.18em;
  color:var(--muted);
}
.page-about .ms-title{
  margin:0;
  font-size:19px;
  font-weight:700;
  color:var(--text);
  letter-spacing:-.01em;
}
.page-about .ms-body{
  padding:14px 16px;
  border:2px solid var(--line);
  border-top:none;
  background:var(--ink);
}
.page-about .ms-body p{
  margin:0;
  font-size:15px;
  line-height:1.78;
  color:var(--muted);
}

/* ---------- 用户与合作方 ---------- */
.page-about .usage-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:var(--gap);
}
.page-about .usage-cell{
  padding:clamp(18px,2.4vw,26px);
  background:var(--panel);
  border:2px solid var(--line);
  box-shadow:var(--hard-sm);
}
.page-about .usage-head{
  margin:0 0 14px;
  font-size:var(--fs-24);
  font-weight:700;
  color:var(--text);
}
.page-about .usage-stats{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:12px;
  margin:0 0 16px;
  padding-bottom:16px;
  border-bottom:1px dashed var(--line);
}
.page-about .usage-stats dt{
  font-size:12px;
  line-height:1.5;
  color:var(--muted);
}
.page-about .usage-stats dd{
  margin:6px 0 0;
  font-size:clamp(18px,2.2vw,24px);
  font-weight:700;
  color:var(--grass);
  letter-spacing:-.02em;
}
.page-about .usage-text{
  margin:0 0 12px;
  font-size:15px;
  line-height:1.78;
  color:var(--muted);
}
.page-about .usage-text:last-of-type{margin-bottom:16px}

/* ---------- 荣誉 ---------- */
.page-about .honor-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:14px;
}
.page-about .honor-item{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  align-items:start;
  gap:14px;
  padding:16px;
  background:var(--panel-2);
  border:2px solid var(--line);
  border-left:6px solid var(--data);
}
.page-about .honor-item:nth-child(1){border-left-color:var(--grass)}
.page-about .honor-item:nth-child(3){border-left-color:var(--flare)}
.page-about .honor-text{
  margin:0;
  font-size:15px;
  line-height:1.75;
  color:var(--muted);
}

/* ---------- 继续了解 ---------- */
.page-about .next-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:var(--gap);
  margin-bottom:clamp(20px,3vw,32px);
}
.page-about .next-card{
  display:block;
  padding:clamp(18px,2.4vw,26px);
  background:var(--panel);
  border:2px solid var(--line);
  box-shadow:var(--hard-sm);
  text-decoration:none;
  transition:transform .28s cubic-bezier(.22,1,.36,1), border-color .28s ease;
}
.page-about .next-card:hover,
.page-about .next-card:focus-visible{
  transform:translateY(-4px);
  border-color:var(--grass);
}
.page-about .next-index{
  margin:0;
  font-size:12px;
  letter-spacing:.2em;
  color:var(--grass);
}
.page-about .next-title{
  margin:.5em 0 .5em;
  font-size:22px;
  font-weight:700;
  color:var(--text);
}
.page-about .next-text{
  margin:0;
  font-size:15px;
  line-height:1.75;
  color:var(--muted);
}

.page-about .quick-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:clamp(18px,2.4vw,26px);
  background:linear-gradient(120deg, rgba(18,194,106,.16), rgba(46,125,255,.18) 65%, transparent), var(--panel-2);
  border:2px solid var(--line);
  box-shadow:var(--hard-sm);
}
.page-about .quick-copy{
  display:flex;
  flex-direction:column;
  gap:4px;
  min-width:0;
}
.page-about .quick-copy strong{
  font-size:18px;
  color:var(--text);
}
.page-about .quick-copy span{
  font-size:14px;
  line-height:1.6;
  color:var(--muted);
}
.page-about .quick-actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}

/* ---------- 响应式 ---------- */
@media (min-width:720px){
  .page-about .flow-bar{grid-template-columns:repeat(2,minmax(0,1fr))}
  .page-about .standard-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .page-about .team-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .page-about .next-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .page-about .honor-list{grid-template-columns:repeat(3,minmax(0,1fr))}
  .page-about .honor-item{grid-template-columns:minmax(0,1fr);gap:10px}
}

@media (min-width:900px){
  .page-about .hero-grid{
    grid-template-columns:minmax(0,7fr) minmax(0,5fr);
    align-items:end;
  }
  .page-about .hero-media .media-frame img{aspect-ratio:8/3}
  .page-about .chapter-head{grid-template-columns:auto minmax(0,1fr) auto;gap:24px}
  .page-about .chapter-note{display:block}
  .page-about .fact-grid{grid-template-columns:repeat(12,minmax(0,1fr))}
  .page-about .fact-cell:nth-child(1){grid-column:span 5}
  .page-about .fact-cell:nth-child(2){grid-column:span 4}
  .page-about .fact-cell:nth-child(3){grid-column:span 3}
  .page-about .flow-bar{grid-template-columns:repeat(4,minmax(0,1fr));gap:0}
  .page-about .flow-node{margin-right:12px}
  .page-about .flow-node:last-child{margin-right:0}
  .page-about .flow-node:not(:last-child)::after{
    content:"";
    position:absolute;
    top:50%;
    right:-12px;
    width:12px;
    height:2px;
    background:var(--grass);
  }
  .page-about .usage-grid{grid-template-columns:repeat(12,minmax(0,1fr))}
  .page-about .usage-cell:nth-child(1){grid-column:span 7}
  .page-about .usage-cell:nth-child(2){grid-column:span 5}
  .page-about .timeline{padding-left:34px}
  .page-about .milestone::before{left:-34px}
}

@media (min-width:1080px){
  .page-about .mission-layout{
    grid-template-columns:200px minmax(0,1fr);
    gap:clamp(26px,3vw,58px);
  }
  .page-about .mission-rail{
    display:block;
    position:sticky;
    top:132px;
    align-self:start;
  }
  .page-about .mission-rail .toc{position:static}
  .page-about .mission-rail .toc-title{
    margin:0 0 12px;
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.24em;
    color:var(--muted);
  }
  .page-about .toc-list{
    list-style:none;
    margin:0;
    padding:0;
    border-left:2px solid var(--line);
  }
  .page-about .toc-link{
    display:flex;
    align-items:baseline;
    gap:10px;
    padding:9px 0 9px 14px;
    margin-left:-2px;
    border-left:2px solid transparent;
    text-decoration:none;
    color:var(--muted);
    transition:color .25s ease, border-color .25s ease;
  }
  .page-about .toc-link:hover{color:var(--text)}
  .page-about .toc-link[aria-current="true"]{
    color:var(--text);
    border-left-color:var(--grass);
  }
  .page-about .toc-num{
    font-family:var(--font-mono);
    font-size:13px;
    letter-spacing:-.02em;
    color:inherit;
    transition:font-size .25s ease, color .25s ease;
  }
  .page-about .toc-link[aria-current="true"] .toc-num{
    font-size:22px;
    color:var(--grass);
  }
  .page-about .toc-name{
    font-size:14px;
    line-height:1.4;
  }
  .page-about .team-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}
  .page-about .standard-grid{padding-bottom:30px}
  .page-about .standard:nth-child(even){transform:translateY(26px)}
}

@media (prefers-reduced-motion:reduce){
  .page-about .flow-node,
  .page-about .next-card,
  .page-about .toc-num,
  .page-about .toc-link,
  .page-about .flow-tip{transition:none}
  .page-about .flow-node:hover,
  .page-about .flow-node:focus-within,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible{transform:none}
}