.page-about{
  --ab-gap: clamp(18px, 3vw, 34px);
  --ab-hair: 1px solid var(--mist);
  --ab-step-pad: clamp(30px, 4vw, 46px);
  background: var(--cream);
  color: var(--ink);
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-crumb{
  padding-top: clamp(14px, 2.5vw, 24px);
}

.page-about h2{
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.22;
  color: var(--indigo);
  font-size: clamp(1.35rem, 3.4vw, 2.1rem);
  margin: .3em 0 .5em;
}

.page-about .section{
  padding-block: clamp(30px, 5vw, 62px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  display: grid;
  gap: var(--ab-gap);
  padding-top: clamp(16px, 3vw, 34px);
}

.page-about .hero-copy h1{
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.1;
  color: var(--indigo);
  font-size: clamp(1.85rem, 6vw, 4rem);
  margin: .3em 0 .5em;
  max-width: 17em;
  overflow-wrap: break-word;
}

.page-about .hero-copy h1 em{
  font-style: normal;
  color: var(--turquoise);
  border-bottom: 3px solid var(--gold);
  padding-bottom: .04em;
}

.page-about .hero-copy .lede{
  max-width: 40em;
  color: var(--ink);
  margin: 0;
}

.page-about .hero-frame{
  position: relative;
  margin: 0;
  border: var(--ab-hair);
  border-radius: var(--radius);
  background: var(--indigo);
  overflow: hidden;
  box-shadow: var(--shadow-2);
}

.page-about .hero-frame img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .hero-stamp{
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 6px 10px;
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--gold-light);
  background: rgba(16, 28, 51, .86);
  border: 1px solid rgba(199, 161, 90, .45);
  border-radius: var(--radius);
}

.page-about .hero-stats{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--mist);
  border: var(--ab-hair);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .hero-stat{
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: var(--cloud);
  padding: clamp(14px, 2.4vw, 22px);
}

.page-about .stat-num{
  font-size: clamp(1.5rem, 4.4vw, 2rem);
  line-height: 1;
  color: var(--indigo);
}

.page-about .stat-label{
  font-size: .8rem;
  letter-spacing: .02em;
  color: var(--rock);
}

/* ---------- 起点 ---------- */
.page-about .start-grid{
  display: grid;
  gap: 10px;
  border-top: 2px solid var(--indigo);
  padding-top: clamp(16px, 2.6vw, 26px);
}

.page-about .start-year{
  margin: 0;
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  line-height: 1;
  color: var(--gold);
  letter-spacing: .04em;
}

.page-about .start-body p{
  margin: 0;
  line-height: 1.85;
  max-width: 44em;
  color: var(--ink);
}

/* ---------- 时间轴 ---------- */
.page-about .section-head .eyebrow{
  margin-bottom: 6px;
}

.page-about .timeline-layout{
  display: grid;
  gap: var(--ab-gap);
}

.page-about .year-rail{
  border: var(--ab-hair);
  border-radius: var(--radius);
  background: var(--cloud);
  padding: 14px 16px;
}

.page-about .rail-title{
  margin: 0 0 10px;
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--rock);
}

.page-about .rail-nav{
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}

.page-about .rail-link{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .85rem;
  line-height: 1.5;
  color: var(--indigo);
  text-decoration: none;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible{
  border-bottom-color: var(--gold);
  color: var(--indigo-deep);
}

.page-about .rail-dot{
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--gold);
}

.page-about .rail-link:nth-child(2n) .rail-dot{
  background: var(--turquoise);
}

.page-about .timeline{
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .t-step{
  position: relative;
  background: var(--cloud);
  border: var(--ab-hair);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  padding: clamp(18px, 2.6vw, 28px) clamp(16px, 2.4vw, 26px) clamp(18px, 2.6vw, 28px) var(--ab-step-pad);
  transition: box-shadow .2s var(--ease), border-color .2s var(--ease);
}

.page-about .t-step:hover{
  box-shadow: var(--shadow-2);
  border-color: var(--sand);
}

.page-about .t-step::before{
  content: "";
  position: absolute;
  left: 16px;
  top: 34px;
  bottom: -22px;
  width: 2px;
  background: repeating-linear-gradient(180deg, var(--mist) 0 6px, transparent 6px 12px);
}

.page-about .t-step:last-child::before{
  display: none;
}

.page-about .t-marker{
  position: absolute;
  left: 11px;
  top: 24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--cloud), 0 0 0 5px var(--mist);
}

.page-about .t-step:nth-child(even) .t-marker{
  background: var(--turquoise);
}

.page-about .t-phase{
  margin: 0 0 6px;
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--vermilion);
}

.page-about .t-title{
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: .01em;
  line-height: 1.3;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  color: var(--indigo);
}

.page-about .t-body{
  margin: 0;
  line-height: 1.85;
  font-size: .95rem;
  color: var(--ink);
  max-width: 44em;
}

/* ---------- 覆盖 ---------- */
.page-about .coverage-grid{
  display: grid;
  gap: var(--ab-gap);
}

.page-about .coverage-copy p{
  margin: 0 0 10px;
  line-height: 1.85;
  max-width: 42em;
  color: var(--ink);
}

.page-about .coverage-map{
  margin: 0;
  border: var(--ab-hair);
  border-radius: var(--radius);
  background: var(--indigo);
  overflow: hidden;
}

.page-about .coverage-map img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .coverage-map figcaption{
  padding: 10px 14px;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--cloud);
  background: var(--indigo-deep);
}

.page-about .city-dots{
  list-style: none;
  margin: clamp(16px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.page-about .city-dots li{
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 10px;
  align-items: start;
  padding: 12px 14px;
  border: var(--ab-hair);
  border-radius: var(--radius);
  background: var(--cloud);
}

.page-about .city-dot{
  grid-row: span 2;
  width: 8px;
  height: 8px;
  margin-top: .55em;
  border-radius: 50%;
  background: var(--turquoise);
  box-shadow: 0 0 0 3px rgba(46, 125, 112, .14);
}

.page-about .city-dots li:nth-child(3n+2) .city-dot{
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(199, 161, 90, .18);
}

.page-about .city-name{
  font-family: var(--font-head);
  font-weight: 800;
  font-size: .95rem;
  color: var(--indigo);
}

.page-about .city-note{
  font-size: .8rem;
  line-height: 1.65;
  color: var(--rock);
}

/* ---------- 团队 ---------- */
.page-about .team-grid{
  display: grid;
  gap: var(--ab-gap);
}

.page-about .team-copy p{
  margin: 0 0 14px;
  line-height: 1.85;
  max-width: 42em;
  color: var(--ink);
}

.page-about .team-frame{
  margin: 0;
  border: var(--ab-hair);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--sand);
}

.page-about .team-frame img{
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 11 / 7;
  object-fit: cover;
}

.page-about .team-folds .fold{
  border: var(--ab-hair);
  border-radius: var(--radius);
  background: var(--cloud);
  overflow: hidden;
}

.page-about .team-folds .fold + .fold{
  margin-top: 10px;
}

.page-about .team-folds .fold-head{
  font-family: var(--font-head);
  font-weight: 800;
  color: var(--indigo);
}

.page-about .team-folds .fold-body p{
  margin: 0;
  line-height: 1.85;
  font-size: .93rem;
  color: var(--ink);
}

/* ---------- 节奏 ---------- */
.page-about .rhythm-head p{
  margin: 0;
  line-height: 1.85;
  max-width: 42em;
  color: var(--ink);
}

.page-about .rhythm-list{
  list-style: none;
  margin: clamp(16px, 3vw, 26px) 0 0;
  padding: 0;
  border-top: 2px solid var(--indigo);
}

.page-about .rhythm-list li{
  display: grid;
  gap: 4px;
  padding: clamp(14px, 2vw, 20px) 0;
  border-bottom: var(--ab-hair);
}

.page-about .rhythm-num{
  font-size: .95rem;
  color: var(--indigo);
  letter-spacing: .02em;
}

.page-about .rhythm-text{
  font-size: .93rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 自检 ---------- */
.page-about .assure{
  position: relative;
  overflow: hidden;
  background: var(--indigo);
  color: var(--cloud);
  border-radius: var(--radius);
  padding: clamp(22px, 4vw, 46px);
}

.page-about .assure::after{
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 1px solid rgba(199, 161, 90, .3);
  box-shadow: 0 0 0 28px rgba(199, 161, 90, .08), 0 0 0 56px rgba(199, 161, 90, .05);
  pointer-events: none;
}

.page-about .assure .eyebrow{
  color: var(--gold-light);
  margin-bottom: 6px;
}

.page-about .assure .eyebrow::before{
  background: var(--gold-light);
}

.page-about .assure h2{
  color: var(--cloud);
}

.page-about .assure-lede{
  margin: 0;
  max-width: 40em;
  line-height: 1.85;
  font-size: .93rem;
  color: rgba(247, 243, 232, .86);
}

.page-about .assure-list{
  position: relative;
  z-index: 1;
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .assure-list li{
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 12px;
  border-top: 1px solid rgba(247, 243, 232, .22);
}

.page-about .assure-list strong{
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: .02em;
  color: var(--gold-light);
}

.page-about .assure-list span{
  font-size: .88rem;
  line-height: 1.75;
  color: rgba(247, 243, 232, .86);
}

/* ---------- 下一步 ---------- */
.page-about .next-links{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .next-links li{
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: var(--ab-hair);
  border-radius: var(--radius);
  background: var(--cloud);
  transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .next-links li:hover{
  border-color: var(--sand);
  box-shadow: var(--shadow-1);
}

.page-about .next-links span{
  font-size: .84rem;
  line-height: 1.7;
  color: var(--rock);
}

.page-about .to-top{
  display: inline-block;
  margin-top: clamp(16px, 3vw, 26px);
  padding-bottom: 2px;
  font-size: .84rem;
  color: var(--indigo);
  text-decoration: none;
  border-bottom: 1px solid var(--mist);
}

.page-about .to-top:hover,
.page-about .to-top:focus-visible{
  border-bottom-color: var(--gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px){
  .page-about .hero-stats{
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .rhythm-list li{
    grid-template-columns: 160px minmax(0, 1fr);
    align-items: baseline;
    gap: 8px 20px;
  }
}

@media (min-width: 820px){
  .page-about .start-grid{
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .coverage-grid,
  .page-about .team-grid{
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .assure-list{
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
  }

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

@media (min-width: 900px){
  .page-about .timeline-layout{
    grid-template-columns: 176px minmax(0, 1fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .year-rail{
    position: sticky;
    top: 92px;
  }

  .page-about .rail-nav{
    flex-direction: column;
    gap: 4px;
  }

  .page-about .t-step:nth-child(even){
    margin-left: clamp(20px, 5vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .rail-link,
  .page-about .t-step,
  .page-about .next-links li{
    transition: none;
  }
}
<<<END>>>