.page-about{
  --about-rule: var(--paper-edge);
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-sans);
  overflow-x: clip;
}

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

.page-about .num{
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.page-about figure{ margin: 0; }

/* ---------- 首屏 ---------- */
.page-about .about-mast{
  background-image:
    repeating-linear-gradient(90deg, transparent 0 95px, rgba(44,66,87,.07) 95px 96px);
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-mast .about-wrap{
  padding-block: 26px 46px;
}
.page-about .breadcrumb{ margin-bottom: 24px; }
.page-about .breadcrumb-list{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-700);
}
.page-about .breadcrumb-list a{
  color: var(--ink-800);
  text-decoration: none;
  border-bottom: 1px solid var(--paper-edge);
  padding-bottom: 1px;
  transition: border-color var(--dur-fast) var(--ease);
}
.page-about .breadcrumb-list a:hover{ border-bottom-color: var(--ink-800); }
.page-about .breadcrumb-sep{ color: var(--celadon-400); }

.page-about .about-kicker{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--ink-700);
}
.page-about .about-kicker::before{
  content: "";
  width: 20px;
  height: 1px;
  background: currentColor;
  opacity: .75;
}
.page-about .about-kicker--amber{ color: var(--amber-200); }

.page-about .about-title{
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1.2;
  letter-spacing: .015em;
  color: var(--ink-900);
  max-width: 16em;
}
.page-about .about-lede{
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-700);
}
.page-about .about-facts{
  list-style: none;
  margin: 34px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}
.page-about .about-facts li{
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.page-about .fact-num{
  font-size: 24px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--ink-900);
}
.page-about .fact-label{
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--ink-700);
}

/* ---------- 纹理带 ---------- */
.page-about .about-texture{
  position: relative;
  height: 190px;
  overflow: hidden;
  background: var(--paper-300);
}
.page-about .about-texture img{
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .45;
}
.page-about .about-texture::after{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--paper-100) 0%, rgba(242,236,223,.12) 50%, var(--paper-100) 100%);
}

/* ---------- 分区骨架 ---------- */
.page-about .about-band{
  padding-block: 48px;
}
.page-about .about-band h2{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.35;
  letter-spacing: .02em;
  color: var(--ink-900);
  max-width: 20em;
}
.page-about .about-band h2::before{
  content: "";
  display: block;
  width: 38px;
  height: 1px;
  background: var(--amber-400);
  margin-bottom: 16px;
}
.page-about .about-sub{
  margin: 14px 0 0;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-700);
}

/* ---------- 起点 ---------- */
.page-about .about-origin{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}
.page-about .about-origin-main p{
  margin: 18px 0 0;
  max-width: 64ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--ink-800);
}
.page-about .dropcap::first-letter{
  float: left;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 3.1em;
  line-height: .88;
  padding: 6px 12px 0 0;
  color: var(--ink-900);
}
.page-about .paper-block{
  background: var(--paper-300);
  border: 1px solid var(--paper-edge);
  padding: 26px 22px;
}
.page-about .side-caption{
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink-700);
}
.page-about .side-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.page-about .side-list li{
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-900);
}
.page-about .side-list .num{
  display: block;
  margin-bottom: 4px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--ink-700);
}

/* ---------- 版本线 ---------- */
.page-about .about-figure{
  margin-top: 28px;
  border: 1px solid var(--about-rule);
  background: var(--paper-300);
}
.page-about .about-figure img{
  display: block;
  width: 100%;
  height: auto;
}
.page-about .about-aside{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 38px;
}
.page-about .rail-caption{
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--ink-700);
}
.page-about .rail-list{
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--about-rule);
}
.page-about .rail-list li{ position: relative; }
.page-about .rail-list li::before{
  content: "";
  position: absolute;
  left: -24.5px;
  top: 15px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--paper-100);
  border: 1px solid var(--celadon-400);
  transition: background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}
.page-about .rail-list li:hover::before{
  background: var(--amber-400);
  border-color: var(--amber-400);
}
.page-about .rail-list a{
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 7px 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-800);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}
.page-about .rail-list a:hover{ color: var(--ink-900); }
.page-about .rail-list .num{
  font-size: 12px;
  color: var(--ink-700);
}

.page-about .about-step{
  padding-bottom: 28px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--about-rule);
}
.page-about .about-step:last-child{
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}
.page-about .step-year{
  display: inline-block;
  margin: 0;
  padding: 3px 10px;
  background: var(--paper-300);
  border: 1px solid var(--paper-edge);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--ink-900);
}
.page-about .about-step h3{
  margin: 12px 0 12px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--ink-900);
}
.page-about .step-points{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}
.page-about .step-points li{
  position: relative;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink-800);
}
.page-about .step-points li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 9px;
  height: 2px;
  background: var(--celadon-400);
}

/* ---------- 专区 ---------- */
.page-about .about-band--tint{
  background: var(--paper-300);
  border-top: 1px solid var(--paper-edge);
  border-bottom: 1px solid var(--paper-edge);
}
.page-about .about-zone{
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}
.page-about .about-zone-lead p{
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-900);
}
.page-about .about-zone-cats{
  background: var(--paper-100);
  border: 1px solid var(--paper-edge);
  padding: 24px 20px;
  box-shadow: 6px 6px 0 var(--paper-edge);
}
.page-about .cat-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .cat-list li{
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-900);
}
.page-about .cat-list .num{
  font-size: 12px;
  color: var(--ink-700);
}

/* ---------- 团队 ---------- */
.page-about .team-grid{
  margin-top: 30px;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}
.page-about .team-col{
  padding: 26px 0;
  border-bottom: 1px solid var(--about-rule);
}
.page-about .team-col:last-child{ border-bottom: 0; }
.page-about .team-count{
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  font-size: 34px;
  font-weight: 600;
  line-height: 1;
  color: var(--ink-900);
}
.page-about .team-unit{
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .08em;
  color: var(--ink-700);
}
.page-about .team-col h3{
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-900);
}
.page-about .team-col > p{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-800);
}
.page-about .team-col details{
  margin-top: 16px;
  padding-left: 14px;
  border-left: 2px solid var(--paper-edge);
  transition: border-color var(--dur-fast) var(--ease);
}
.page-about .team-col details[open]{ border-left-color: var(--celadon-400); }
.page-about .team-col summary{
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--ink-700);
}
.page-about .team-col summary::-webkit-details-marker{ display: none; }
.page-about .team-col summary::after{
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1;
  color: var(--ink-900);
}
.page-about .team-col details[open] summary::after{ content: "−"; }
.page-about .team-col details ul{
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .team-col details li{
  position: relative;
  padding-left: 14px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-800);
}
.page-about .team-col details li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background: var(--celadon-400);
}
.page-about .team-figure{
  margin-top: 32px;
  border: 1px solid var(--about-rule);
}
.page-about .team-figure img{
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 指标（深色） ---------- */
.page-about .about-band--deep{
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--text-100);
}
.page-about .about-band--deep::before{
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(44,66,87,.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(44,66,87,.55) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .3;
}
.page-about .about-band--deep .about-wrap{ position: relative; }
.page-about .about-band--deep h2{ color: var(--text-100); }
.page-about .about-band--deep .about-sub{ color: var(--text-400); }
.page-about .metric-grid{
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 1px solid var(--line-500);
}
.page-about .metric-grid li{
  padding: 26px 0;
  border-bottom: 1px solid var(--line-500);
}
.page-about .metric-grid li:last-child{ border-bottom: 0; }
.page-about .metric-num{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--amber-200);
}
.page-about .metric-num span{
  margin-left: 5px;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--text-400);
}
.page-about .metric-grid h3{
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-100);
}
.page-about .metric-grid p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-400);
}

/* ---------- 覆盖范围与伙伴 ---------- */
.page-about .partner-line{
  position: relative;
  list-style: none;
  margin: 38px 0 0;
  padding: 24px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}
.page-about .partner-line::before{
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--celadon-400), rgba(111,167,149,0));
}
.page-about .partner-line li{
  position: relative;
  padding-left: 24px;
}
.page-about .partner-line li::before{
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--celadon-400);
}
.page-about .partner-num{
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink-900);
}
.page-about .partner-line h3{
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink-900);
}
.page-about .partner-line p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-700);
}

/* ---------- 收尾 ---------- */
.page-about .about-band--cta{
  border-top: 1px solid var(--about-rule);
}
.page-about .about-cta-row{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}
.page-about .about-cta-row .btn{
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  text-decoration: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 700px){
  .page-about .about-facts{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-texture{ height: 260px; }
  .page-about .about-band{ padding-block: 64px; }
}

@media (min-width: 900px){
  .page-about .about-mast .about-wrap{ padding-block: 30px 56px; }
  .page-about .about-band{ padding-block: 78px; }

  .page-about .about-origin{
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-aside{
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 64px;
    margin-top: 44px;
  }
  .page-about .about-rail{
    align-self: start;
    position: sticky;
    top: 92px;
  }
  .page-about .about-zone{
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .team-grid{
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.18fr);
  }
  .page-about .team-col{
    padding: 28px 24px 30px;
    border-bottom: 0;
  }
  .page-about .team-col:first-child{ padding-left: 0; }
  .page-about .team-col:last-child{ padding-right: 0; }
  .page-about .team-col + .team-col{ border-left: 1px solid var(--about-rule); }

  .page-about .metric-grid{
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-top: 38px;
  }
  .page-about .metric-grid li{
    padding: 28px 26px 26px;
    border-bottom: 0;
  }
  .page-about .metric-grid li:first-child{ padding-left: 0; }
  .page-about .metric-grid li + li{ border-left: 1px solid var(--line-500); }

  .page-about .partner-line{
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
    padding-top: 34px;
  }
  .page-about .partner-line::before{
    left: 0;
    right: 22%;
    top: 12px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--celadon-400), rgba(111,167,149,0));
  }
  .page-about .partner-line li{
    padding-left: 0;
    padding-top: 20px;
  }
  .page-about .partner-line li::before{
    top: 0;
    left: 0;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .rail-list li::before,
  .page-about .rail-list a,
  .page-about .breadcrumb-list a,
  .page-about .team-col details{
    transition: none;
  }
}
<<<END>>>