.page-about{
  --about-rail-w:168px;
  --about-rail-gap:52px;
  --about-pad:20px;
  --about-hair:rgba(198,255,74,.14);
  --about-hair-soft:rgba(198,255,74,.08);
}

@media (min-width:768px){
  .page-about{ --about-pad:32px; }
}

/* ---------- 通用壳 ---------- */
.page-about .about-shell{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--about-pad);
}

.page-about .prose{
  max-width:640px;
}

.page-about .prose--wide{
  max-width:720px;
}

.page-about .prose p{
  margin:0 0 18px;
}

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

.page-about .prose a{
  color:var(--accent);
  text-decoration:none;
  border-bottom:1px solid rgba(198,255,74,.4);
  transition:border-color .25s var(--ease),color .25s var(--ease);
}

.page-about .prose a:hover,
.page-about .prose a:focus-visible{
  color:var(--lime-strong);
  border-bottom-color:var(--lime-strong);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  padding-block:40px 52px;
  border-bottom:1px solid var(--about-hair);
}

.page-about .about-hero::before{
  content:"";
  position:absolute;
  inset:-30% -12% auto -12%;
  height:165%;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(198,255,74,.075) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(198,255,74,.075) 1px, transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(125% 82% at 76% 6%, #000 0%, transparent 72%);
  mask-image:radial-gradient(125% 82% at 76% 6%, #000 0%, transparent 72%);
}

.page-about .about-hero::after{
  content:"";
  position:absolute;
  right:-140px;
  top:-120px;
  width:420px;
  height:420px;
  z-index:-1;
  border-radius:50%;
  border:1px solid rgba(255,122,61,.22);
  pointer-events:none;
}

@media (min-width:1024px){
  .page-about .about-hero{
    padding-block:72px 84px;
  }
  .page-about .about-hero::after{
    right:-90px;
    top:-160px;
    width:600px;
    height:600px;
  }
}

.page-about .about-hero h1{
  margin:14px 0 22px;
  max-width:820px;
}

.page-about .about-hero .lead{
  max-width:620px;
  margin:0;
  color:var(--text-muted);
}

/* ---------- 首屏指标 ---------- */
.page-about .hero-stats{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1px;
  margin-block:36px 0;
  background:var(--about-hair);
  border:1px solid var(--about-hair);
  border-radius:var(--r-lg);
  overflow:hidden;
}

@media (min-width:800px){
  .page-about .hero-stats{
    grid-template-columns:repeat(4,minmax(0,1fr));
    margin-block:48px 0;
  }
}

.page-about .hero-stat{
  display:flex;
  flex-direction:column;
  gap:3px;
  padding:20px 18px;
  background:var(--ink-800);
}

.page-about .hs-num{
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums slashed-zero;
  font-size:clamp(26px,6.4vw,36px);
  line-height:1.04;
  font-weight:600;
  letter-spacing:-.02em;
  color:var(--accent);
}

.page-about .hs-plus{
  font-size:.7em;
  color:var(--accent-2);
  margin-left:1px;
}

.page-about .hs-unit{
  font-size:13px;
  letter-spacing:.02em;
  color:var(--text);
}

.page-about .hs-label{
  font-size:12px;
  line-height:1.6;
  color:var(--text-muted);
}

/* ---------- 长卷布局 ---------- */
.page-about .about-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--about-pad);
}

@media (min-width:1024px){
  .page-about .about-layout{
    grid-template-columns:var(--about-rail-w) minmax(0,1fr);
    column-gap:var(--about-rail-gap);
    align-items:start;
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-toc{
  display:none;
}

@media (min-width:1024px){
  .page-about .about-toc{
    display:block;
    position:sticky;
    top:36px;
    padding-block:84px 40px;
  }
}

.page-about .toc-title{
  margin:0 0 14px;
  font-size:11px;
  letter-spacing:.2em;
  color:var(--text-muted);
}

.page-about .toc-list{
  list-style:none;
  margin:0;
  padding:0 0 0 1px;
  border-left:1px solid var(--about-hair);
}

.page-about .toc-list a{
  display:flex;
  align-items:baseline;
  gap:10px;
  margin-left:-1px;
  padding:9px 0 9px 14px;
  border-left:2px solid transparent;
  color:var(--text-muted);
  font-size:13px;
  text-decoration:none;
  transition:color .25s var(--ease),border-color .25s var(--ease);
}

.page-about .toc-list a:hover,
.page-about .toc-list a:focus-visible{
  color:var(--accent);
  border-left-color:var(--accent);
}

.page-about .toc-num{
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums;
  font-size:12px;
  color:var(--accent);
  opacity:.75;
}

.page-about .toc-label{
  letter-spacing:.04em;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter{
  padding-block:52px;
  border-top:1px solid var(--about-hair);
  scroll-margin-top:88px;
}

.page-about .about-flow > .about-chapter:first-child{
  border-top:0;
}

@media (min-width:1024px){
  .page-about .about-chapter{
    padding-block:76px;
  }
  .page-about .about-flow > .about-chapter:first-child{
    padding-top:36px;
  }
}

.page-about .chapter-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:0 16px;
  align-items:start;
  margin-bottom:30px;
}

.page-about .chapter-num{
  font-family:var(--font-display);
  font-size:clamp(44px,11vw,82px);
  font-weight:200;
  line-height:.78;
  letter-spacing:-.05em;
  color:var(--accent);
  opacity:.9;
}

.page-about .chapter-titles{
  padding-top:6px;
}

.page-about .chapter-titles .title{
  margin:8px 0 0;
  max-width:16ch;
}

@media (min-width:1024px){
  .page-about .chapter-head{
    gap:0 26px;
    margin-bottom:38px;
  }
  .page-about .chapter-num{
    margin-top:-6px;
  }
}

/* ---------- 双列正文 ---------- */
.page-about .split-body{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:28px;
}

@media (min-width:900px){
  .page-about .split-body{
    grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);
    gap:44px;
    align-items:start;
  }
  .page-about .split-body--reverse{
    grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);
  }
  .page-about .split-body--reverse .prose{
    order:2;
    max-width:none;
  }
  .page-about .split-body--reverse .about-figure{
    order:1;
  }
}

/* ---------- 图片 ---------- */
.page-about .about-figure{
  margin:0;
  border-radius:var(--r-lg);
  overflow:hidden;
  background:var(--ink-800);
  border:1px solid var(--about-hair-soft);
}

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

.page-about .about-figure .media-caption{
  display:block;
  padding:14px 18px 16px;
  margin:0;
  font-size:12px;
  line-height:1.7;
  color:var(--text-muted);
  border-top:1px solid var(--about-hair-soft);
}

.page-about .about-figure--full{
  margin-top:36px;
}

@media (min-width:900px){
  .page-about .about-figure--full{
    margin-top:48px;
  }
}

/* ---------- 团队表 ---------- */
.page-about .about-table-wrap{
  margin-top:40px;
  border:1px solid var(--about-hair);
  border-radius:var(--r-md);
  overflow:hidden;
}

.page-about .about-table-wrap .data-table{
  width:100%;
  border-collapse:collapse;
  font-size:14px;
}

.page-about .about-table-wrap .data-table caption{
  padding:16px 18px;
  text-align:left;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--text-muted);
  background:var(--ink-800);
  border-bottom:1px solid var(--about-hair);
}

.page-about .about-table-wrap .data-table th,
.page-about .about-table-wrap .data-table td{
  padding:14px 18px;
  text-align:left;
  border-bottom:1px solid var(--about-hair-soft);
  vertical-align:top;
}

.page-about .about-table-wrap .data-table thead th{
  font-size:12px;
  letter-spacing:.1em;
  font-weight:500;
  color:var(--text-muted);
  background:var(--ink-900);
  white-space:nowrap;
}

.page-about .about-table-wrap .data-table tbody tr:nth-child(even){
  background:rgba(22,107,79,.22);
}

.page-about .about-table-wrap .data-table tbody tr:last-child td{
  border-bottom:0;
}

.page-about .about-table-wrap .data-table .num{
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums slashed-zero;
  color:var(--accent);
  font-size:15px;
  white-space:nowrap;
}

/* ---------- 展开详情 ---------- */
.page-about .about-details{
  margin-top:24px;
  border:1px solid var(--about-hair);
  border-radius:var(--r-md);
  background:var(--ink-800);
}

.page-about .about-details summary{
  cursor:pointer;
  list-style:none;
  padding:16px 20px;
  font-size:14px;
  color:var(--accent);
  letter-spacing:.02em;
  display:flex;
  align-items:center;
  gap:10px;
}

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

.page-about .about-details summary::before{
  content:"+";
  font-family:var(--font-data);
  font-size:16px;
  line-height:1;
  color:var(--accent-2);
}

.page-about .about-details[open] summary::before{
  content:"–";
}

.page-about .about-details summary:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:-2px;
}

.page-about .check-flow{
  list-style:none;
  margin:0;
  padding:0 20px 20px;
}

.page-about .check-flow li{
  padding:16px 0;
  border-top:1px solid var(--about-hair-soft);
}

.page-about .check-flow li:first-child{
  border-top:0;
}

.page-about .cf-num{
  display:inline-block;
  margin-bottom:6px;
  font-family:var(--font-data);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--accent-3);
}

.page-about .check-flow p{
  margin:0;
  font-size:14px;
  line-height:1.75;
  color:var(--text-muted);
}

/* ---------- 版本时间轴 ---------- */
.page-about .ver-line{
  list-style:none;
  margin:38px 0 0;
  padding:0;
  display:grid;
  grid-template-columns:minmax(0,1fr);
}

.page-about .ver-node{
  position:relative;
  padding:0 0 28px 28px;
  border-left:1px solid var(--about-hair);
}

.page-about .ver-node:last-child{
  padding-bottom:0;
  border-left-color:transparent;
}

.page-about .ver-dot{
  position:absolute;
  left:-6px;
  top:5px;
  width:11px;
  height:11px;
  box-sizing:border-box;
  border-radius:50%;
  background:var(--bg);
  border:2px solid var(--accent);
}

.page-about .ver-node:last-child .ver-dot{
  border-color:var(--accent-2);
}

.page-about .ver-tag{
  display:block;
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums slashed-zero;
  font-size:22px;
  font-weight:600;
  letter-spacing:-.01em;
  color:var(--accent);
}

.page-about .ver-name{
  margin:6px 0 4px;
  font-size:15px;
  color:var(--text);
}

.page-about .ver-desc{
  margin:0;
  font-size:13px;
  line-height:1.75;
  color:var(--text-muted);
}

@media (min-width:860px){
  .page-about .ver-line{
    grid-template-columns:repeat(4,minmax(0,1fr));
    gap:0 26px;
    margin-top:48px;
  }
  .page-about .ver-node{
    padding:32px 0 0;
    border-left:0;
    border-top:1px solid var(--about-hair);
  }
  .page-about .ver-node:last-child{
    border-left-color:transparent;
    border-top-color:rgba(255,122,61,.34);
  }
  .page-about .ver-dot{
    left:0;
    top:-6px;
  }
  .page-about .ver-tag{
    font-size:26px;
  }
}

/* ---------- 服务版图 ---------- */
.page-about .coverage-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(158px,1fr));
  gap:1px;
  margin-top:38px;
  background:var(--about-hair);
  border:1px solid var(--about-hair);
  border-radius:var(--r-lg);
  overflow:hidden;
}

.page-about .coverage-cell{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:22px 20px;
  background:var(--ink-800);
  transition:background .3s var(--ease);
}

.page-about .coverage-cell:hover{
  background:var(--ink-700);
}

.page-about .cov-num{
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums slashed-zero;
  font-size:clamp(24px,5.4vw,32px);
  font-weight:600;
  letter-spacing:-.02em;
  line-height:1.05;
  color:var(--accent);
}

.page-about .cov-label{
  font-size:12.5px;
  line-height:1.7;
  color:var(--text-muted);
}

/* ---------- 收尾 ---------- */
.page-about .about-chapter--next .split-body{
  gap:34px;
}

@media (min-width:900px){
  .page-about .about-chapter--next .split-body{
    grid-template-columns:minmax(0,1.25fr) minmax(0,.85fr);
  }
}

.page-about .about-cta{
  padding:26px 24px 24px;
  border:1px solid var(--about-hair);
  border-radius:var(--r-lg);
  background:
    linear-gradient(160deg, rgba(198,255,74,.09), rgba(255,122,61,.07) 62%, transparent 100%),
    var(--ink-800);
}

.page-about .cta-kicker{
  margin:0 0 10px;
  font-size:11px;
  letter-spacing:.2em;
  color:var(--accent-2);
}

.page-about .cta-text{
  margin:0 0 20px;
  font-size:14px;
  line-height:1.8;
  color:var(--text-muted);
}

.page-about .about-cta .btn{
  margin-bottom:10px;
}

.page-about .about-cta .btn:last-child{
  margin-bottom:0;
}

/* ---------- 动效收敛 ---------- */
.page-about .reveal{
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}

.page-about .ver-node:nth-child(2){ transition-delay:.07s; }
.page-about .ver-node:nth-child(3){ transition-delay:.14s; }
.page-about .ver-node:nth-child(4){ transition-delay:.21s; }

@media (prefers-reduced-motion:reduce){
  .page-about .reveal,
  .page-about .coverage-cell,
  .page-about .toc-list a{
    transition:none !important;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width:420px){
  .page-about .hero-stats{
    grid-template-columns:minmax(0,1fr);
  }
  .page-about .chapter-head{
    gap:0 12px;
  }
  .page-about .about-table-wrap .data-table th,
  .page-about .about-table-wrap .data-table td{
    padding:12px 14px;
  }
}