.page-about{
  --about-sticky: 92px;
  --about-measure: 64ch;
  --about-ink-soft: #3B372E;
  --about-accent-ink: #A8541F;
  --about-line-ink: rgba(7,20,38,.18);
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-sans);
}

.page-about h1,
.page-about h2,
.page-about h3{
  margin: 0;
  font-weight: 800;
  letter-spacing: -.02em;
}

.page-about p{ margin: 0; }

.page-about a{ color: inherit; }

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  padding: 36px 0 52px;
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% -20%, rgba(56,242,207,.20), rgba(56,242,207,0) 62%),
    linear-gradient(180deg, #0A1B2E 0%, var(--ink) 72%);
  overflow: hidden;
}

.page-about .about-hero::after{
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(140,163,188,.13) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(140,163,188,.13) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.85), rgba(0,0,0,0) 88%);
  mask-image: linear-gradient(180deg, rgba(0,0,0,.85), rgba(0,0,0,0) 88%);
}

.page-about .about-hero .container{
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb{
  margin-bottom: 28px;
  font-size: 12px;
}

.page-about .about-hero__title{
  margin-top: 14px;
  max-width: 22ch;
  font-size: clamp(30px, 8.2vw, 68px);
  line-height: 1.06;
  color: var(--white);
}

.page-about .about-hero__title span{
  display: block;
  color: var(--cyan);
}

.page-about .about-hero__lead{
  margin-top: 22px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-hero__axis{
  list-style: none;
  margin: 34px 0 0;
  padding: 20px 0 0;
  border-top: 2px solid var(--line-cyan);
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 18px 20px;
}

.page-about .about-hero__axis li{
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__num{
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-hero__lbl{
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 通用标题区 ---------- */
.page-about .about-head{
  max-width: var(--about-measure);
}

.page-about .about-head h2,
.page-about .sheet-head h2{
  margin-top: 12px;
  font-size: clamp(23px, 5.2vw, 36px);
  line-height: 1.25;
}

.page-about .about-head h2{ color: var(--white); }

.page-about .about-head p:not(.eyebrow){
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 01 起点 ---------- */
.page-about .about-why{
  padding: 54px 0 58px;
  background: var(--ink);
}

.page-about .about-why__grid{
  margin-top: 30px;
  display: grid;
  gap: 16px;
}

.page-about .about-card{
  background: var(--panel);
  border: 2px solid rgba(140,163,188,.26);
  box-shadow: var(--hard-shadow);
  padding: 20px 18px 22px;
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}

.page-about .about-card:hover{
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .about-card__idx{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-card h3{
  margin-top: 10px;
  font-size: 16.5px;
  line-height: 1.5;
  color: var(--white);
  font-weight: 700;
}

.page-about .about-card p:not(.about-card__idx){
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-path{
  margin-top: 36px;
  padding-top: 24px;
  border-top: 2px solid var(--line-cyan);
}

.page-about .about-path ol{
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-path li{
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-path strong{
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .about-path span{
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

/* ---------- 暖纸色长文区 ---------- */
.page-about .about-sheet{
  background: var(--paper);
  color: var(--ink);
  padding: 54px 0 58px;
  border-top: 2px solid var(--shadow);
  border-bottom: 2px solid var(--shadow);
}

.page-about .sheet-head{
  max-width: var(--about-measure);
}

.page-about .about-sheet .sheet-head .eyebrow,
.page-about .about-stand .sheet-head .eyebrow{
  color: var(--about-accent-ink);
}

.page-about .sheet-head h2{ color: var(--ink); }

.page-about .sheet-head p:not(.eyebrow){
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-sheet a{
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* ---------- 时间线 ---------- */
.page-about .sheet-figure{
  margin: 30px 0 0;
  border-color: var(--shadow);
}

.page-about .timeline{
  margin-top: 34px;
  display: grid;
  gap: 26px;
}

.page-about .timeline__axis{
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  border-bottom: 2px solid var(--about-line-ink);
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline__axis li{ flex: 0 0 auto; }

.page-about .timeline__axis a{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: #57503F;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.page-about .timeline__axis a::before{
  content: "";
  width: 8px;
  height: 8px;
  background: var(--orange);
  flex: 0 0 auto;
}

.page-about .timeline__axis a:hover,
.page-about .timeline__axis a:focus-visible{
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .timeline__list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .era{
  scroll-margin-top: 100px;
  background: #FBF6EC;
  border: 2px solid var(--shadow);
  box-shadow: var(--hard-shadow);
  padding: 20px 18px 22px;
}

.page-about .era__year{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--about-accent-ink);
}

.page-about .era h3{
  margin-top: 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink);
  font-weight: 700;
}

.page-about .era p:not(.era__year){
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team{
  padding: 54px 0 58px;
  background: linear-gradient(180deg, #0A1B2E 0%, var(--ink) 60%);
  border-top: 2px solid var(--line);
}

.page-about .team-grid{
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px;
}

.page-about .team-block{
  background: var(--panel);
  border: 2px solid rgba(140,163,188,.24);
  box-shadow: 3px 3px 0 var(--shadow);
  padding: 16px 14px 18px;
  min-width: 0;
}

.page-about .team-block:nth-child(even){
  border-color: rgba(255,122,47,.42);
}

.page-about .team-block__num{
  display: block;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-block:nth-child(even) .team-block__num{
  color: var(--orange);
}

.page-about .team-block__role{
  display: block;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
}

.page-about .team-block__note{
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .team-figure{
  margin: 26px 0 0;
}

/* ---------- 04 校对 ---------- */
.page-about .steps{
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 2px solid var(--about-line-ink);
}

.page-about .steps li{
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line-ink);
}

.page-about .steps__num{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--about-accent-ink);
}

.page-about .steps h3{
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  font-weight: 700;
}

.page-about .steps p{
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-eco{
  padding: 54px 0 58px;
  background:
    radial-gradient(90% 70% at 12% 0%, rgba(56,242,207,.14), rgba(56,242,207,0) 60%),
    var(--ink);
  border-top: 2px solid var(--line);
}

.page-about .eco-grid{
  margin-top: 30px;
  display: grid;
  gap: 26px;
}

.page-about .eco-stats{
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px;
}

.page-about .eco-stat{
  background: rgba(12,30,52,.72);
  border: 2px solid var(--line-cyan);
  padding: 14px 12px;
}

.page-about .eco-stat b{
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .eco-stat span{
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .eco-list{
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .eco-list li{
  border-left: 2px solid var(--orange);
  padding-left: 14px;
}

.page-about .eco-list h3{
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.5;
}

.page-about .eco-list p{
  margin-top: 6px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .eco-note{
  margin-top: 20px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .eco-cta{
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .eco-figure{
  margin: 0;
}

/* ---------- 06 服务标准 ---------- */
.page-about .about-stand{
  background: var(--paper);
  color: var(--ink);
  padding: 54px 0 58px;
  border-top: 2px solid var(--shadow);
  border-bottom: 2px solid var(--shadow);
}

.page-about .stand-list{
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .stand-list li{
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--about-line-ink);
}

.page-about .stand-list li:last-child{
  border-bottom: 1px solid var(--about-line-ink);
}

.page-about .stand-list h3{
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: .02em;
  border-left: 4px solid var(--orange);
  padding-left: 12px;
  line-height: 1.5;
}

.page-about .stand-list p{
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.page-about .about-cta{
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-stand .btn{
  border-color: var(--shadow);
  color: var(--ink);
}

.page-about .about-stand .btn--primary{
  background: var(--orange);
  border-color: var(--shadow);
  color: #1A0D04;
}

.page-about .about-stand .btn--ghost{
  background: transparent;
  border-color: var(--about-line-ink);
  color: var(--ink);
}

.page-about .about-stand .btn:hover{
  transform: translateY(-2px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px){
  .page-about .about-hero{
    padding: 48px 0 64px;
  }

  .page-about .about-hero__axis{
    grid-template-columns: repeat(4, minmax(0,1fr));
    gap: 20px 28px;
  }

  .page-about .about-hero__num{
    font-size: 26px;
  }

  .page-about .about-why,
  .page-about .about-team,
  .page-about .about-eco,
  .page-about .about-sheet,
  .page-about .about-stand{
    padding: 68px 0 72px;
  }

  .page-about .about-why__grid{
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 18px;
  }

  .page-about .about-path ol{
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 22px;
  }

  .page-about .team-grid{
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 14px;
  }

  .page-about .steps li{
    grid-template-columns: 76px minmax(0,1fr);
    gap: 20px;
    align-items: start;
  }

  .page-about .steps__num{
    padding-top: 3px;
  }

  .page-about .stand-list li{
    grid-template-columns: 172px minmax(0,1fr);
    gap: 30px;
    align-items: start;
  }
}

@media (min-width: 960px){
  .page-about .timeline{
    grid-template-columns: 150px minmax(0,1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .timeline__axis{
    position: sticky;
    top: var(--about-sticky);
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 2px solid var(--about-line-ink);
    overflow: visible;
  }

  .page-about .timeline__axis a{
    padding: 8px 0 8px 14px;
  }

  .page-about .timeline__list{
    gap: 22px;
  }

  .page-about .timeline__list > .era:nth-child(even){
    margin-left: 44px;
  }

  .page-about .eco-grid{
    grid-template-columns: minmax(0,1.1fr) minmax(0,1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .team-grid{
    grid-template-columns: repeat(5, minmax(0,1fr));
  }

  .page-about .about-head h2,
  .page-about .sheet-head h2{
    line-height: 1.2;
  }
}

@media (min-width: 1200px){
  .page-about .about-hero__lead{
    font-size: 16px;
  }

  .page-about .timeline__list > .era:nth-child(even){
    margin-left: 72px;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-card,
  .page-about .about-stand .btn{
    transition: opacity .12s linear;
  }

  .page-about .about-card:hover,
  .page-about .about-stand .btn:hover{
    transform: none;
  }
}
<<<END>>>