.page-about{
  color: var(--color-ink);
  background: var(--color-paper);
}

/* 页面头部 */
.page-about .page-header{
  position: relative;
  padding: 2.6rem 0 3.2rem;
  background:
    radial-gradient(circle at 88% 14%, rgba(212,175,55,.18), transparent 260px),
    linear-gradient(180deg, #FFF9EE, var(--color-paper));
  overflow: hidden;
}
.page-about .page-header::after{
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 8px;
  background: var(--gradient-gold-red);
  clip-path: polygon(0 0, 100% 0, 97.5% 100%, 2.5% 100%);
}
.page-about .about-eyebrow{
  margin: 0 0 .7rem;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .3em;
  color: var(--color-red);
}
.page-about .page-title{
  margin: 0 0 1.2rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.5vw, 3.4rem);
  line-height: 1.12;
  color: var(--color-ink);
}
.page-about .page-title-brand{
  color: var(--color-red);
}
.page-about .page-title-divider{
  color: var(--color-gold);
  margin: 0 .12em;
}
.page-about .page-title-topic{
  color: var(--color-ink);
}
.page-about .page-lead{
  max-width: 42rem;
  margin: 0 0 1.8rem;
  font-family: var(--font-body);
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  line-height: 1.85;
  color: rgba(46,42,40,.82);
}
.page-about .page-index{
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  padding: 1.2rem 0 0;
  border-top: 1px dashed var(--color-brown);
}
.page-about .page-index a{
  font-size: .85rem;
  font-weight: 600;
  color: var(--color-ink);
  text-decoration: none;
  padding: .34rem .78rem;
  border: 1px solid rgba(166,124,0,.4);
  background: rgba(251,246,236,.72);
  transition: background .18s, color .18s, border-color .18s;
}
.page-about .page-index a:hover,
.page-about .page-index a:focus-visible{
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--color-night);
}

/* 通用区块标题 */
.page-about .about-kicker{
  display: inline-block;
  margin: 0 0 .7rem;
  padding: .28rem .8rem .28rem .72rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: .14em;
  color: var(--color-red);
  background: rgba(212,175,55,.16);
  border-left: 3px solid var(--color-gold);
}
.page-about .about-title{
  position: relative;
  margin: 0 0 1.5rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.8vw, 2.35rem);
  line-height: 1.2;
  color: var(--color-ink);
  padding-bottom: .75rem;
}
.page-about .about-title::after{
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 72px;
  height: 4px;
  border-radius: 2px;
  background: var(--gradient-gold-red);
}

/* 我们是谁 */
.page-about .identity-section{
  padding: 3.6rem 0 3rem;
}
.page-about .identity-layout{
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.8rem;
}
.page-about .identity-note{
  padding: 1.4rem 1.5rem;
  background: rgba(251,246,236,.9);
  border-top: 4px solid var(--color-gold);
  border-bottom: 1px solid rgba(166,124,0,.3);
  box-shadow: 5px 5px 0 rgba(200,16,46,.08);
}
.page-about .identity-note-label{
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--color-red);
  margin-bottom: .5rem;
}
.page-about .identity-note-quote{
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.65;
  color: var(--color-ink);
  margin: 0 0 .8rem;
}
.page-about .identity-note-meta{
  font-size: .82rem;
  color: var(--color-brown);
  border-top: 1px dashed rgba(166,124,0,.4);
  padding-top: .7rem;
}
.page-about .identity-body{
  padding: 1.8rem;
  background:
    linear-gradient(135deg, rgba(255,255,255,.28), transparent 55%),
    var(--color-paper);
  border: 1px solid rgba(166,124,0,.28);
  box-shadow: 6px 6px 0 rgba(212,175,55,.2);
}
.page-about .identity-body p{
  margin: 0 0 1rem;
  font-size: .96rem;
  line-height: 1.9;
  color: rgba(46,42,40,.85);
}
.page-about .identity-body p:last-child{
  margin-bottom: 0;
}

/* 数据从哪来 */
.page-about .source-section{
  padding: 3.8rem 0;
  background: linear-gradient(135deg, var(--color-night) 0%, var(--color-violet) 100%);
  color: rgba(251,246,236,.9);
}
.page-about .source-heading .about-kicker,
.page-about .promise-body .about-kicker{
  color: var(--color-gold);
  background: rgba(212,175,55,.1);
}
.page-about .source-heading .about-title,
.page-about .promise-body .about-title{
  color: var(--color-paper);
}
.page-about .source-heading .about-title::after,
.page-about .promise-body .about-title::after{
  background: linear-gradient(90deg, var(--color-gold), rgba(212,175,55,.15));
}
.page-about .source-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}
.page-about .source-side,
.page-about .timeline-main{
  min-width: 0;
}
.page-about .source-main img,
.page-about .timeline-image,
.page-about .promise-image{
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 3px;
}
.page-about .source-main img{
  width: 100%;
  border: 1px solid rgba(212,175,55,.45);
  box-shadow: 0 20px 40px rgba(0,0,0,.32);
}
.page-about .image-caption{
  margin: .8rem 0 0;
  padding-left: .85rem;
  border-left: 2px solid rgba(212,175,55,.55);
  font-size: .84rem;
  line-height: 1.7;
  color: rgba(251,246,236,.66);
}
.page-about .source-list{
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(212,175,55,.3);
}
.page-about .source-item{
  border-bottom: 1px solid rgba(212,175,55,.3);
}
.page-about .source-detail summary{
  position: relative;
  list-style: none;
  cursor: pointer;
  padding: 1rem 2.4rem 1rem 0;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--color-paper);
}
.page-about .source-detail summary::-webkit-details-marker{
  display: none;
}
.page-about .source-detail summary::after{
  content: "+";
  position: absolute;
  right: .2rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--color-gold);
}
.page-about .source-detail[open] summary::after{
  content: "–";
}
.page-about .source-detail p{
  margin: 0 0 1rem;
  padding-right: 1rem;
  font-size: .9rem;
  line-height: 1.85;
  color: rgba(251,246,236,.74);
}

/* 团队规模 */
.page-about .team-section{
  padding: 3.6rem 0;
}
.page-about .team-layout{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about .team-note{
  padding: 1.8rem 1.6rem;
  background:
    linear-gradient(135deg, rgba(255,255,255,.32), transparent 52%),
    #F3ECD9;
  border: 1px solid rgba(166,124,0,.3);
  box-shadow: 8px 8px 0 rgba(212,175,55,.24);
}
.page-about .team-number{
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 5rem;
  line-height: 1;
  background: var(--gradient-gold-red);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.page-about .team-number small{
  display: inline-block;
  margin-left: .35rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-ink);
  -webkit-text-fill-color: var(--color-ink);
  background: none;
}
.page-about .team-note > p{
  margin: 1rem 0 0;
  font-weight: 600;
  color: var(--color-ink);
}
.page-about .team-note-caption{
  margin-top: .6rem;
  font-size: .84rem;
  font-weight: 400;
  line-height: 1.7;
  color: rgba(46,42,40,.72);
}
.page-about .team-body p{
  font-size: .96rem;
  line-height: 1.9;
  color: rgba(46,42,40,.84);
}

/* 发展历程 */
.page-about .timeline-section{
  padding: 3.6rem 0 3.8rem;
  background: linear-gradient(180deg, var(--color-paper) 0%, #F3ECD9 100%);
}
.page-about .timeline-layout{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.2rem;
}
.page-about .timeline-intro{
  margin: 1rem 0 1.5rem;
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(46,42,40,.8);
}
.page-about .timeline-list{
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .timeline-list::before{
  content: "";
  position: absolute;
  left: 7px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold), var(--color-red));
}
.page-about .timeline-item{
  position: relative;
  padding: 0 0 1.4rem 2.3rem;
}
.page-about .timeline-item::before{
  content: "";
  position: absolute;
  left: 0;
  top: .55rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-paper);
  border: 3px solid var(--color-gold);
  box-shadow: 0 0 0 3px rgba(200,16,46,.14);
}
.page-about .timeline-year{
  display: inline-block;
  margin-bottom: .45rem;
  padding: .14rem .55rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: .88rem;
  letter-spacing: .06em;
  color: var(--color-red);
  background: rgba(212,175,55,.18);
}
.page-about .timeline-content{
  padding: 1rem 1.2rem;
  background: rgba(251,246,236,.92);
  border: 1px solid rgba(166,124,0,.26);
  border-left: 4px solid var(--color-brown);
  box-shadow: 4px 4px 0 rgba(212,175,55,.1);
}
.page-about .timeline-content h3{
  margin: 0 0 .3rem;
  font-family: var(--font-heading);
  font-size: 1.04rem;
  color: var(--color-ink);
}
.page-about .timeline-content p{
  margin: 0;
  font-size: .89rem;
  line-height: 1.72;
  color: rgba(46,42,40,.76);
}
.page-about .timeline-image-block{
  margin-top: 1.6rem;
}
.page-about .timeline-image{
  width: 100%;
  border: 1px solid rgba(166,124,0,.3);
  box-shadow: 12px 12px 0 rgba(200,16,46,.1);
}

/* 服务承诺 */
.page-about .promise-section{
  padding: 3.8rem 0;
  background: linear-gradient(150deg, var(--color-violet) 0%, var(--color-night) 100%);
  color: rgba(251,246,236,.9);
}
.page-about .promise-layout{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.2rem;
}
.page-about .promise-list{
  list-style: none;
  counter-reset: promise;
  margin: 1.4rem 0 2rem;
  padding: 0;
}
.page-about .promise-list li{
  position: relative;
  counter-increment: promise;
  margin-bottom: .85rem;
  padding: 1.1rem 1.2rem 1.1rem 3.4rem;
  background: rgba(59,31,94,.42);
  border: 1px solid rgba(212,175,55,.28);
}
.page-about .promise-list li::before{
  content: counter(promise, decimal-leading-zero);
  position: absolute;
  left: 1.05rem;
  top: 1.15rem;
  font-family: var(--font-heading);
  font-weight: 900;
  color: var(--color-gold);
}
.page-about .promise-list h3{
  margin: 0 0 .3rem;
  font-family: var(--font-heading);
  font-size: 1.08rem;
  color: var(--color-paper);
}
.page-about .promise-list p{
  margin: 0;
  font-size: .91rem;
  line-height: 1.75;
  color: rgba(251,246,236,.78);
}
.page-about .promise-footnote{
  margin: 0 0 1.7rem;
  padding-left: 1rem;
  border-left: 3px solid var(--color-gold);
  font-size: .88rem;
  line-height: 1.8;
  color: rgba(251,246,236,.7);
}
.page-about .promise-visual{
  align-self: start;
}
.page-about .promise-image{
  width: 100%;
  border: 1px solid rgba(212,175,55,.4);
  box-shadow: 10px 10px 0 rgba(0,0,0,.3);
}
.page-about .promise-extra{
  margin-top: 1.5rem;
  padding: 1.2rem 1.3rem;
  background: rgba(11,30,54,.58);
  border: 1px solid rgba(212,175,55,.24);
  font-size: .9rem;
  line-height: 1.8;
  color: rgba(251,246,236,.82);
}
.page-about .promise-extra-title{
  margin-bottom: .4rem;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-gold);
}
.page-about .promise-extra p{
  margin: .15rem 0;
}
.page-about .promise-section .btn-secondary{
  background: rgba(251,246,236,.12);
  border-color: var(--color-gold);
  color: var(--color-paper);
}
.page-about .promise-section .btn-secondary:hover{
  background: var(--color-gold);
  border-color: var(--color-gold);
  color: var(--color-night);
}

/* 桌面端布局 */
@media (min-width: 900px){
  .page-about .page-header{
    padding: 3.2rem 0 4rem;
  }
  .page-about .identity-layout{
    grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
    gap: 3rem;
  }
  .page-about .source-grid{
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 2.6rem;
  }
  .page-about .team-layout{
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.6fr);
    gap: 3rem;
  }
  .page-about .promise-layout{
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 3rem;
  }
}

@media (min-width: 1000px){
  .page-about .timeline-layout{
    grid-template-columns: minmax(0, .85fr) minmax(0, 2fr);
    gap: 3.5rem;
  }
  .page-about .timeline-aside{
    position: sticky;
    top: calc(var(--header-height) + 28px);
    align-self: start;
  }
}