.page-about{
  --about-line: rgba(11,31,58,.14);
  --about-line-soft: rgba(11,31,58,.07);
  --about-gap: clamp(46px,7vw,90px);
  --about-shadow: 5px 5px 0 rgba(11,31,58,.07);
  background-color: var(--paper);
  color: var(--black);
  padding-bottom: clamp(48px,7vw,88px);
  overflow-x: clip;
}

/* ---------- 首屏档案头 ---------- */
.page-about .about-masthead{
  position: relative;
  display: grid;
  gap: clamp(22px,3.4vw,36px);
  padding: clamp(18px,3vw,32px) 0 clamp(30px,4.5vw,52px);
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-masthead::before{
  content:"";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(to right, var(--about-line-soft) 0 1px, transparent 1px 96px);
  -webkit-mask-image: linear-gradient(to bottom, #000, transparent 88%);
  mask-image: linear-gradient(to bottom, #000, transparent 88%);
  pointer-events: none;
}
.page-about .about-masthead > *{
  position: relative;
  z-index: 1;
}
.page-about .about-masthead__top{
  display: grid;
  gap: 18px;
}
.page-about .about-masthead__lead-block{
  display: grid;
  gap: 16px;
  align-content: start;
}
.page-about .about-masthead h1{
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(32px,7.2vw,66px);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--ink);
}
.page-about .about-masthead__lead{
  margin: 0;
  max-width: 60ch;
  font-size: clamp(15px,1.9vw,18px);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-vnote{
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .28em;
  line-height: 1;
  color: var(--dust);
  writing-mode: horizontal-tb;
}
@media (min-width: 960px){
  .page-about .about-masthead__top{
    grid-template-columns: minmax(0,1fr) 28px;
    align-items: stretch;
  }
  .page-about .about-vnote{
    writing-mode: vertical-rl;
    justify-self: end;
    align-self: start;
    padding-top: 6px;
  }
}

.page-about .about-facts{
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-line);
}
.page-about .about-facts__row{
  display: grid;
  grid-template-columns: 96px minmax(0,1fr);
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-facts__key{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--dust);
  text-transform: uppercase;
  align-self: center;
}
.page-about .about-facts__val{
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}
@media (min-width: 760px){
  .page-about .about-facts{
    grid-template-columns: repeat(3,minmax(0,1fr));
    border-bottom: 0;
  }
  .page-about .about-facts__row{
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 14px 18px;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
  }
  .page-about .about-facts__row:first-child{
    border-left: 0;
    padding-left: 0;
  }
}

/* ---------- 通用区块节奏 ---------- */
.page-about .about-section{
  padding-top: var(--about-gap);
}
.page-about .section-head{
  display: grid;
  gap: 12px;
  margin-bottom: clamp(20px,3vw,32px);
}
.page-about .section-head__title{
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(25px,3.6vw,40px);
  line-height: 1.18;
  letter-spacing: -.015em;
  color: var(--ink);
}
.page-about .section-head__lead{
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--dust);
}

/* ---------- 左窄右宽 ---------- */
.page-about .about-split{
  display: grid;
  gap: clamp(18px,3vw,28px);
}
.page-about .about-split__side{
  display: grid;
  gap: 12px;
  align-content: start;
}
.page-about .about-split__main{
  display: grid;
  gap: clamp(18px,3vw,26px);
  min-width: 0;
}
@media (min-width: 920px){
  .page-about .about-split{
    grid-template-columns: 168px minmax(0,1fr);
    gap: clamp(28px,4vw,56px);
  }
  .page-about .about-split__side{
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }
  .page-about .about-split__side .about-vnote{
    writing-mode: vertical-rl;
    letter-spacing: .26em;
    padding-top: 4px;
  }
}

/* ---------- 图片框 ---------- */
.page-about .about-figure{
  margin: 0;
  display: grid;
  gap: 8px;
}
.page-about .about-figure img{
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 10;
  object-fit: cover;
  border: 1px solid var(--ink);
  box-shadow: var(--about-shadow);
  background-color: var(--ink-2);
}
.page-about .about-figure--team img{
  aspect-ratio: 3 / 2;
}
.page-about .about-figure--safe img{
  aspect-ratio: 1 / 1;
}
.page-about .about-figure .media-frame__caption{
  font-size: 12px;
  line-height: 1.6;
  color: var(--dust);
  letter-spacing: .02em;
}

.page-about .about-prose p{
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--black);
}
.page-about .about-prose p + p{
  margin-top: 14px;
}

/* ---------- 年份轨道 ---------- */
.page-about .about-track__layout{
  display: grid;
  gap: clamp(18px,3vw,28px);
}
.page-about .about-track__side{
  display: grid;
  gap: 14px;
  align-content: start;
}
.page-about .filter-bar{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
@media (min-width: 900px){
  .page-about .about-track__layout{
    grid-template-columns: 152px minmax(0,1fr);
    gap: clamp(26px,4vw,52px);
  }
  .page-about .about-track__side{
    position: sticky;
    top: calc(var(--bar-h) + 24px);
  }
  .page-about .about-track__side .filter-bar{
    flex-direction: column;
    align-items: stretch;
  }
  .page-about .about-track__side .about-vnote{
    writing-mode: vertical-rl;
    letter-spacing: .26em;
  }
}

.page-about .year-track{
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  position: relative;
  display: grid;
  gap: 14px;
}
.page-about .year-track::before{
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold), rgba(212,175,55,.16));
}
.page-about .year-track__item{
  position: relative;
  display: grid;
  gap: 6px;
  padding: 16px 18px;
  background-color: var(--white);
  border: 1px solid var(--about-line);
  box-shadow: var(--about-shadow);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.page-about .year-track__item::before{
  content: "";
  position: absolute;
  left: -30px;
  top: 22px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--gold);
  box-shadow: 0 0 0 3px var(--paper), 0 0 0 4px rgba(212,175,55,.4);
}
.page-about .year-track__item:hover{
  transform: translateY(-2px);
  border-color: var(--gold-deep);
  box-shadow: 6px 7px 0 rgba(11,31,58,.1);
}
.page-about .year-track__item[hidden]{
  display: none !important;
}
@media (min-width: 620px){
  .page-about .year-track__item{
    grid-template-columns: 78px minmax(0,1fr);
    gap: 4px 20px;
    align-items: start;
  }
}
.page-about .year-track__year{
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .03em;
  line-height: 1.1;
  color: var(--ink);
}
.page-about .year-track__body{
  display: grid;
  gap: 8px;
  justify-items: start;
  min-width: 0;
}
.page-about .year-track__title{
  margin: 0;
  font-family: var(--font-cn);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.005em;
  color: var(--ink);
}
.page-about .year-track__text{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--black);
}
.page-about .about-track__foot{
  margin: clamp(18px,3vw,26px) 0 0;
  padding-left: 34px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--dust);
  border-left: 0;
}

/* ---------- 规模 ---------- */
.page-about .stat-strip{
  display: grid;
  grid-template-columns: repeat(2,minmax(0,1fr));
  gap: 1px;
  background-color: var(--about-line);
  border: 1px solid var(--about-line);
}
@media (min-width: 780px){
  .page-about .stat-strip{
    grid-template-columns: repeat(4,minmax(0,1fr));
  }
}
.page-about .stat-strip__item{
  background-color: var(--paper);
  padding: 20px 16px;
  display: grid;
  gap: 6px;
  align-content: start;
}
.page-about .stat-strip__num{
  font-family: var(--font-mono);
  font-size: clamp(26px,3.6vw,40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink);
}
.page-about .stat-strip__label{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ochre);
}
.page-about .stat-strip__note{
  font-size: 13px;
  line-height: 1.6;
  color: var(--dust);
}
.page-about .about-scale__tail{
  margin: clamp(16px,2.6vw,24px) 0 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--black);
  padding-left: 14px;
  border-left: 2px solid var(--snow);
}

/* ---------- 团队 ---------- */
.page-about .about-team__body{
  display: grid;
  gap: clamp(20px,3vw,30px);
}
@media (min-width: 940px){
  .page-about .about-team__body{
    grid-template-columns: minmax(0,0.9fr) minmax(0,1.1fr);
    align-items: start;
  }
}
.page-about .team-grid{
  display: grid;
  gap: 12px;
}
@media (min-width: 620px) and (max-width: 939px){
  .page-about .team-grid{
    grid-template-columns: repeat(3,minmax(0,1fr));
  }
}
.page-about .team-card{
  display: grid;
  gap: 8px;
  padding: 18px 16px;
  background-color: var(--white);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--snow);
}
.page-about .team-card__name{
  margin: 0;
  font-family: var(--font-cn);
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
}
.page-about .team-card__desc{
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--black);
}
.page-about .about-team__tail{
  margin: clamp(16px,2.6vw,24px) 0 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--dust);
  max-width: 72ch;
}

/* ---------- 安全流程 ---------- */
.page-about .about-safe__grid{
  display: grid;
  gap: clamp(20px,3vw,32px);
}
@media (min-width: 940px){
  .page-about .about-safe__grid{
    grid-template-columns: minmax(0,1.15fr) minmax(0,0.85fr);
    align-items: start;
  }
}
.page-about .about-safe__main{
  min-width: 0;
  border-top: 2px solid var(--snow);
  padding-top: clamp(16px,2.6vw,24px);
}
.page-about .about-safe .accordion__panel p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--black);
}

/* ---------- 理由 ---------- */
.page-about .reason-grid{
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0,1fr);
}
@media (min-width: 700px){
  .page-about .reason-grid{
    grid-template-columns: repeat(2,minmax(0,1fr));
    gap: 18px;
  }
}
.page-about .reason-card{
  position: relative;
  display: grid;
  gap: 8px;
  padding: 22px 18px 20px;
  background-color: var(--white);
  border: 1px solid var(--about-line);
  box-shadow: var(--about-shadow);
  transition: transform .2s ease, border-color .2s ease;
}
.page-about .reason-card:hover{
  transform: translateY(-2px);
  border-color: var(--gold-deep);
}
.page-about .reason-card__num{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold-deep);
}
.page-about .reason-card__title{
  margin: 0;
  font-family: var(--font-cn);
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
}
.page-about .reason-card__text{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--black);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta{
  margin-top: var(--about-gap);
  display: grid;
  gap: 16px;
  padding: clamp(26px,4.2vw,46px);
  background-color: var(--ink);
  border-top: 3px solid var(--gold);
  color: var(--white);
}
.page-about .about-cta__title{
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(23px,3.4vw,36px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--white);
}
.page-about .about-cta__text{
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--snow);
}
.page-about .about-cta__links{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

@media (prefers-reduced-motion: reduce){
  .page-about .year-track__item,
  .page-about .reason-card{
    transition: none;
  }
  .page-about .year-track__item:hover,
  .page-about .reason-card:hover{
    transform: none;
  }
}
<<<END>>>