.page-about{
  --ab-radius:16px;
  --ab-gap:20px;
  background:
    radial-gradient(120% 80% at 84% -10%, rgba(57,240,208,.11), transparent 55%),
    radial-gradient(90% 60% at 4% 34%, rgba(62,107,82,.20), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--deep) 58%, var(--ink) 100%);
  color: var(--text);
  font-family: var(--font-sans);
  padding-top: calc(var(--header-h) + 16px);
  padding-bottom: 8px;
  overflow-x: clip;
}
.page-about .section{
  padding: 44px 0;
}
.page-about .ab-hero,
.page-about .ab-cert,
.page-about .ab-versions,
.page-about .ab-method,
.page-about .ab-team,
.page-about .ab-eco,
.page-about .ab-standard{
  scroll-margin-top: calc(var(--header-h) + 18px);
}
.page-about .breadcrumb{
  margin-top: 12px;
  margin-bottom: 4px;
}
.page-about .ab-sec-head{
  max-width: 760px;
  margin-bottom: 26px;
}
.page-about .ab-sec-head .section-lead{
  margin-top: 12px;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.75;
}
.page-about a{
  color: var(--cyan);
}
.page-about a:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero-grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 30px;
  align-items: start;
}
.page-about .ab-hero-copy h1{
  margin: 10px 0 0;
  font-size: clamp(30px, 7.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
}
.page-about .ab-lead{
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .ab-ver-card{
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  margin-top: 24px;
  padding: 16px 18px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--ab-radius);
  background: var(--glass);
  box-shadow: inset 0 0 0 1px rgba(243,239,228,.04);
}
.page-about .ab-ver-id{
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.page-about .ab-ver-label{
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--stone);
}
.page-about .ab-ver-num{
  font-size: clamp(28px, 8vw, 46px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--amber);
}
.page-about .ab-copy .copy-btn{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 15px;
  border: 1px solid var(--line-cyan);
  border-radius: 999px;
  background: var(--deep-2);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12.5px;
  cursor: pointer;
  transition: transform 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}
.page-about .ab-copy .copy-btn:hover{
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--deep);
}
.page-about .ab-hero-cta{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}
.page-about .ab-hero-figure{
  position: relative;
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background:
    linear-gradient(140deg, rgba(57,240,208,.07), transparent 55%),
    var(--deep-2);
}
.page-about .ab-hero-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  object-fit: cover;
}
.page-about .ab-hero-figure figcaption{
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 三级认证 ---------- */
.page-about .ab-cert{
  background:
    linear-gradient(180deg, transparent, rgba(21,33,29,.75) 30%, rgba(21,33,29,.75) 70%, transparent);
}
.page-about .ab-cert-grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: var(--ab-gap);
}
.page-about .ab-cert-card{
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: rgba(11,15,13,.62);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}
.page-about .ab-cert-card:hover,
.page-about .ab-cert-card:focus-within{
  transform: translateY(-2px);
  border-color: var(--line-cyan);
}
.page-about .ab-cert-badge{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line-cyan);
  background: var(--cyan-dim);
  color: var(--cyan);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
}
.page-about .ab-cert-badge:focus-visible,
.page-about .ab-cert-badge:hover{
  transform: translateY(-2px);
  box-shadow: 0 0 0 2px var(--ink), 0 0 0 4px var(--cyan);
  outline: none;
}
.page-about .ab-cert-card .card-title{
  margin: 0;
  font-size: 20px;
  color: var(--paper);
}
.page-about .ab-cert-card p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-dim);
}
.page-about .ab-check{
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}
.page-about .ab-check li{
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text);
}
.page-about .ab-check li::before{
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--cyan);
}

/* ---------- 折叠说明 ---------- */
.page-about .ab-details{
  display: grid;
  gap: 12px;
  margin-top: 24px;
}
.page-about .cert-item{
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--glass);
  overflow: hidden;
}
.page-about .cert-item summary{
  padding: 15px 18px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: color 180ms var(--ease);
}
.page-about .cert-item summary::-webkit-details-marker{ display:none; }
.page-about .cert-item summary::before{
  content: "+";
  font-family: var(--font-mono);
  color: var(--cyan);
  font-size: 16px;
  line-height: 1;
}
.page-about .cert-item[open] summary::before{ content: "−"; }
.page-about .cert-item summary:hover{ color: var(--cyan); }
.page-about .cert-item summary:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}
.page-about .cert-body{
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
}
.page-about .cert-body p{
  margin: 14px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 版本演进 ---------- */
.page-about .ab-ver-shell{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 24px;
  align-items: start;
}
.page-about .ab-ver-index{
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--deep-2);
  padding: 14px 16px;
}
.page-about .ab-ver-index-title{
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--stone);
}
.page-about .ab-ver-index ol{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 10px;
  overflow-x: auto;
}
.page-about .ab-ver-index a{
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--text-dim);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
}
.page-about .ab-ver-index a .mono{
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11.5px;
}
.page-about .ab-ver-index a:hover,
.page-about .ab-ver-index a:focus-visible{
  color: var(--paper);
  border-color: var(--line-cyan);
  background: rgba(57,240,208,.08);
}
.page-about .ab-timeline{
  position: relative;
  min-width: 0;
}
.page-about .ab-timeline::before{
  content: "";
  position: absolute;
  left: 21px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(57,240,208,.55), rgba(138,148,142,.18));
}
.page-about .ab-ver-figure{
  margin: 0 0 24px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: rgba(21,33,29,.8);
}
.page-about .ab-ver-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  object-fit: cover;
}
.page-about .ab-ver-figure figcaption{
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--stone);
}
.page-about .tl-item{
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0,1fr);
  gap: 14px;
  padding-bottom: 18px;
}
.page-about .tl-item:last-child{ padding-bottom: 0; }
.page-about .tl-mark{
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 14px;
}
.page-about .tl-code{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--line-cyan);
  background: var(--deep);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.page-about .tl-item:last-child .tl-code{
  border-color: var(--amber);
  color: var(--amber);
  background: rgba(242,169,59,.1);
}
.page-about .tl-body{
  min-width: 0;
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(11,15,13,.6);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}
.page-about .tl-item:hover .tl-body,
.page-about .tl-item:focus-within .tl-body{
  transform: translateY(-2px);
  border-color: var(--line-cyan);
  background: rgba(21,33,29,.92);
}
.page-about .tl-body .card-title{
  margin: 0 0 8px;
  font-size: 17px;
  color: var(--paper);
}
.page-about .tl-body p{
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}
.page-about .tl-more{
  margin-top: 10px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 13px !important;
  color: rgba(243,239,228,.58) !important;
  transition: color 200ms var(--ease);
}
.page-about .tl-item:hover .tl-more,
.page-about .tl-item:focus-within .tl-more{
  color: var(--text) !important;
}

/* ---------- 内容与数据 ---------- */
.page-about .ab-metrics{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px;
  margin-bottom: 24px;
}
.page-about .ab-metric{
  padding: 16px 16px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(14,42,34,.95), rgba(11,15,13,.9));
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .ab-metric-num{
  font-family: var(--font-mono);
  font-size: clamp(28px, 6.4vw, 40px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--amber);
}
.page-about .ab-metric-unit{
  font-size: .5em;
  margin-left: 2px;
  color: var(--amber);
}
.page-about .ab-metric-label{
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--stone);
}
.page-about .ab-method-grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 16px;
}
.page-about .ab-method-card{
  padding: 20px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--moss);
  border-radius: var(--radius-sm);
  background: var(--glass);
}
.page-about .ab-method-card h3{
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--paper);
}
.page-about .ab-method-card p{
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .ab-method-card p:last-child{ margin-bottom: 0; }
.page-about .ab-inline-link{
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 180ms var(--ease);
}
.page-about .ab-inline-link:hover{ color: var(--paper); }

/* ---------- 团队 ---------- */
.page-about .ab-team-grid{
  display: grid;
  grid-template-columns: minmax(0,1fr);
  gap: 26px;
  align-items: start;
}
.page-about .ab-team-copy h2{ margin-top: 0; }
.page-about .ab-rhythm{
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-rhythm li{
  display: grid;
  grid-template-columns: 74px minmax(0,1fr);
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about .ab-rhythm-key{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: .04em;
}
.page-about .ab-team-figure{
  margin: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  background: rgba(21,33,29,.72);
}
.page-about .ab-team-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  object-fit: cover;
}
.page-about .ab-team-figure figcaption{
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
}
.page-about .ab-eco-item{
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(11,15,13,.55);
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}
.page-about .ab-eco-item:hover,
.page-about .ab-eco-item:focus-within{
  transform: translateY(-2px);
  border-color: var(--line-cyan);
}
.page-about .ab-eco-num{
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 32px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}
.page-about .ab-eco-unit{
  font-size: .56em;
  margin-left: 2px;
}
.page-about .ab-eco-item h3{
  margin: 8px 0 6px;
  font-size: 14.5px;
  color: var(--paper);
}
.page-about .ab-eco-item p{
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about .ab-eco-note{
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 服务标准 ---------- */
.page-about .ab-std-card{
  padding: 26px 20px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--ab-radius);
  background:
    linear-gradient(150deg, rgba(14,42,34,.94), rgba(11,15,13,.96));
}
.page-about .ab-std-intro .section-lead{
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-dim);
}
.page-about .ab-std-list{
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}
.page-about .ab-std-list li{
  display: grid;
  grid-template-columns: 34px minmax(0,1fr);
  gap: 12px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .ab-std-no{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clay);
  padding-top: 3px;
}
.page-about .ab-std-list h3{
  margin: 0 0 5px;
  font-size: 15.5px;
  color: var(--paper);
}
.page-about .ab-std-list p{
  margin: 0;
  font-size: 13.8px;
  line-height: 1.75;
  color: var(--text-dim);
}
.page-about .ab-std-cta{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px){
  .page-about .ab-metrics{
    grid-template-columns: repeat(4, minmax(0,1fr));
  }
  .page-about .ab-cert-grid{
    grid-template-columns: repeat(2, minmax(0,1fr));
  }
  .page-about .ab-method-grid{
    grid-template-columns: repeat(2, minmax(0,1fr));
  }
}

@media (min-width: 900px){
  .page-about .section{
    padding: 64px 0;
  }
  .page-about .ab-hero-grid{
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }
  .page-about .ab-hero-figure{
    margin-top: 8px;
  }
  .page-about .ab-cert-grid{
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 22px;
  }
  .page-about .ab-team-grid{
    grid-template-columns: 6fr 6fr;
    gap: 40px;
  }
  .page-about .ab-eco-grid{
    grid-template-columns: repeat(4, minmax(0,1fr));
  }
  .page-about .ab-std-card{
    padding: 36px 32px;
  }
}

@media (min-width: 980px){
  .page-about .ab-ver-shell{
    grid-template-columns: 212px minmax(0,1fr);
    gap: 36px;
  }
  .page-about .ab-ver-index{
    position: sticky;
    top: calc(var(--header-h) + 24px);
    padding: 16px;
  }
  .page-about .ab-ver-index ol{
    flex-direction: column;
    gap: 6px;
    overflow: visible;
  }
  .page-about .ab-ver-index a{
    width: 100%;
    justify-content: flex-start;
    border-color: transparent;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 8px 10px;
    white-space: normal;
  }
  .page-about .ab-ver-index a:hover,
  .page-about .ab-ver-index a:focus-visible{
    border-left-color: var(--cyan);
    background: rgba(57,240,208,.07);
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .ab-cert-card,
  .page-about .ab-eco-item,
  .page-about .tl-body,
  .page-about .ab-cert-badge,
  .page-about .ab-copy .copy-btn{
    transition: none;
  }
  .page-about .ab-cert-card:hover,
  .page-about .ab-eco-item:hover,
  .page-about .tl-item:hover .tl-body,
  .page-about .ab-cert-badge:hover,
  .page-about .ab-copy .copy-btn:hover{
    transform: none;
  }
}
<<<END>>>