.page-about{
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  line-height: 1.75;
  padding-bottom: clamp(48px, 8vw, 96px);
  --ab-gap: clamp(18px, 3vw, 34px);
  --ab-section-pad: clamp(36px, 5vw, 72px);
}

.page-about a{
  color: inherit;
}

.page-about .breadcrumb{
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .breadcrumb-list{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  color: var(--silver);
}

.page-about .breadcrumb-item + .breadcrumb-item::before{
  content: "/";
  margin-right: 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb-link{
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible{
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  padding-top: clamp(24px, 4vw, 44px);
}

.page-about .about-hero-grid{
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .eyebrow{
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .eyebrow--orange{
  color: var(--orange);
}

.page-about .about-hero-tag{
  display: inline-block;
  margin-left: 10px;
  padding: 1px 7px;
  border: 1px solid var(--line-cyan);
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.page-about .about-title{
  margin: 14px 0 0;
  font-size: clamp(34px, 7.4vw, 76px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-lede{
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  color: var(--mist);
}

.page-about .about-prose{
  margin: 18px 0 0;
  max-width: 66ch;
  color: var(--mist);
  font-size: 16px;
}

.page-about .about-prose p{
  margin: 0 0 14px;
}

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

.page-about .about-prose--tight{
  font-size: 15px;
  color: var(--silver);
  max-width: 68ch;
}

.page-about .about-inline-link{
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible{
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.page-about .about-facts{
  display: grid;
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-facts > div{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  background: var(--ink);
}

.page-about .about-facts dt{
  font-size: 13px;
  color: var(--silver);
  letter-spacing: 0.04em;
}

.page-about .about-facts dd{
  margin: 0;
  font-size: 17px;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-hero-figure{
  margin: clamp(26px, 4vw, 44px) 0 0;
  border: 1px solid var(--line);
  background: var(--deep);
}

.page-about .about-hero-figure img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-cap{
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--silver);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell{
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  padding-top: clamp(32px, 5vw, 64px);
}

.page-about .about-index-list{
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-top: 1px solid var(--line);
  background: var(--line);
}

.page-about .about-index-list > li{
  background: var(--ink);
}

.page-about .about-index-title{
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--silver);
}

.page-about .about-index-link{
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  color: var(--silver);
  font-size: 14px;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--ease), background-color var(--ease), border-color var(--ease);
}

.page-about .about-index-num{
  font-size: 11px;
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible{
  color: var(--paper);
  background: var(--panel);
  border-left-color: var(--cyan);
}

/* ---------- 章节 ---------- */
.page-about .about-section{
  padding: var(--ab-section-pad) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child{
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section-head{
  display: flex;
  align-items: flex-start;
  gap: clamp(12px, 2vw, 22px);
}

.page-about .about-num{
  flex: 0 0 auto;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.2;
  color: var(--cyan);
  letter-spacing: 0.04em;
  padding-top: 6px;
}

.page-about .about-h2{
  margin: 0;
  font-size: clamp(24px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline{
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-tl-item{
  background: var(--ink);
  padding: 18px 16px 20px;
  transition: background-color var(--ease), box-shadow var(--ease);
}

.page-about .about-tl-item:hover,
.page-about .about-tl-item:focus-within{
  background: var(--panel);
  box-shadow: inset 2px 0 0 0 var(--cyan);
}

.page-about .about-tl-year{
  display: inline-block;
  font-size: 13px;
  color: var(--orange);
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 4px;
}

.page-about .about-tl-title{
  margin: 12px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-tl-text{
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 分栏 ---------- */
.page-about .about-split{
  display: grid;
  gap: clamp(22px, 3vw, 38px);
  margin-top: 22px;
}

.page-about .about-steps{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-step{
  position: relative;
  padding: 16px 16px 18px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-cyan);
  background: var(--ink);
  transition: background-color var(--ease), border-color var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within{
  background: var(--panel);
  border-color: var(--line-strong);
  border-left-color: var(--cyan);
}

.page-about .about-step-index{
  font-size: 12px;
  color: var(--cyan);
  letter-spacing: 0.16em;
}

.page-about .about-step-title{
  margin: 6px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step-text{
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--silver);
  line-height: 1.7;
}

.page-about .about-figure{
  margin: 0;
  border: 1px solid var(--line);
  background: var(--deep);
}

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

.page-about .about-figure--process img{
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--map img{
  aspect-ratio: 2 / 1;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-stats{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat{
  background: var(--ink);
  padding: 16px 14px;
  display: grid;
  gap: 4px;
}

.page-about .about-stat-num{
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-stat-label{
  font-size: 13px;
  color: var(--silver);
  line-height: 1.5;
}

.page-about .about-cats{
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .tag{
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--line-strong);
  font-size: 13px;
  color: var(--mist);
  background: var(--ink);
  transition: border-color var(--ease), color var(--ease);
}

.page-about .tag:hover{
  border-color: var(--line-cyan);
  color: var(--cyan);
}

.page-about .tag--orange{
  border-color: rgba(255, 122, 26, .55);
  color: var(--orange);
}

.page-about .tag--muted{
  margin-top: 12px;
  font-size: 12px;
  color: var(--silver);
  border-style: dashed;
}

.page-about .about-net{
  display: block;
  width: 100%;
  height: auto;
  padding: 12px 14px;
  color: var(--cyan);
  border-top: 1px solid var(--line);
  background: var(--deep);
  opacity: .8;
}

/* ---------- 团队 ---------- */
.page-about .about-team{
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team-card{
  background: var(--ink);
  padding: 18px 16px;
  transition: background-color var(--ease), box-shadow var(--ease);
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-within{
  background: var(--panel);
  box-shadow: inset 0 2px 0 0 var(--cyan);
}

.page-about .about-team-index{
  font-size: 12px;
  color: var(--silver);
  letter-spacing: 0.14em;
}

.page-about .about-team-title{
  margin: 8px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team-text{
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--silver);
  line-height: 1.7;
}

/* ---------- 老用户 ---------- */
.page-about .about-pair{
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.page-about .about-panel{
  padding: 20px 18px 22px;
  border: 1px solid var(--line);
  background: var(--deep);
  transition: border-color var(--ease), background-color var(--ease);
}

.page-about .about-panel:hover,
.page-about .about-panel:focus-within{
  border-color: var(--line-cyan);
  background: var(--panel);
}

.page-about .about-panel-title{
  margin: 10px 0 0;
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-panel-text{
  margin: 10px 0 18px;
  font-size: 15px;
  color: var(--mist);
  line-height: 1.75;
}

/* ---------- 合作 ---------- */
.page-about .about-coop{
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-coop-card{
  padding: 18px 16px 20px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--orange);
  background: var(--ink);
  transition: background-color var(--ease), border-color var(--ease);
}

.page-about .about-coop-card:hover,
.page-about .about-coop-card:focus-within{
  background: var(--panel);
  border-color: var(--line-strong);
  border-top-color: var(--cyan);
}

.page-about .about-coop-title{
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-coop-text{
  margin: 8px 0 0;
  font-size: 14px;
  color: var(--silver);
  line-height: 1.7;
}

.page-about .about-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 桌面 ---------- */
@media (min-width: 720px){
  .page-about .about-hero-grid{
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-stats{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-pair{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-coop{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-timeline{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px){
  .page-about .about-shell{
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    align-items: start;
  }

  .page-about .about-index{
    position: sticky;
    top: 108px;
  }

  .page-about .about-split{
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-split--reverse{
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .about-timeline{
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px){
  .page-about .about-title{
    letter-spacing: -0.025em;
  }

  .page-about .about-num{
    padding-top: 10px;
  }
}
<<<END>>>