.page-about{
  --about-line: rgba(28,37,48,.1);
  --about-gold-line: rgba(176,140,45,.35);
  --about-shadow: 0 20px 44px rgba(28,37,48,.08);
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb{
  padding-top: 1.25rem;
  padding-bottom: 0;
  border-bottom: 1px solid var(--about-line);
}

/* ========== 01 · 品牌定位 ========== */
.page-about .about-position{
  padding: clamp(2.5rem, 7vw, 5.5rem) 0 clamp(2rem, 5vw, 4rem);
  position: relative;
}
.page-about .about-position::after{
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: min(28vw, 420px);
  background: linear-gradient(120deg, transparent 20%, rgba(176,140,45,.08) 20%, rgba(176,140,45,.08) 100%);
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.page-about .about-position__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  position: relative;
  z-index: 1;
}
.page-about .about-position__rail{
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.page-about .about-position__stamp{
  width: 64px;
  height: 76px;
  background: var(--red);
  color: var(--white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .25rem;
  border-radius: 2px;
  box-shadow: 0 6px 18px rgba(166,44,44,.28);
}
.page-about .about-position__stamp-cn{
  font-family: var(--font-heading);
  font-size: 1.5rem;
  line-height: 1;
}
.page-about .about-position__stamp-en{
  font-family: var(--font-mono);
  font-size: .5rem;
  letter-spacing: .08em;
  text-align: center;
  line-height: 1.4;
}
.page-about .about-position__body{
  max-width: 780px;
}
.page-about .about-position__title{
  font-family: var(--font-heading);
  font-size: var(--font-h1);
  line-height: 1.18;
  font-weight: 700;
  margin: 1.25rem 0 1.5rem;
}
.page-about .about-position__title span{
  color: var(--gold);
}
.page-about .about-position__lead{
  font-size: var(--font-caption);
  line-height: 1.9;
  color: var(--ink-soft);
  max-width: 58ch;
  margin-bottom: 2.25rem;
}
.page-about .about-position__lead .tag{
  margin: 0 .25rem;
}
.page-about .about-position__stats{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 2rem 0 2.5rem;
}
.page-about .about-stat{
  background: var(--white);
  border: 1px solid rgba(176,140,45,.25);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .25rem;
}
.page-about .about-stat__num{
  font-family: var(--font-heading);
  font-size: 1.75rem;
  line-height: 1.1;
  color: var(--ink);
}
.page-about .about-stat__label{
  font-size: var(--font-label);
  color: var(--gray-muted);
}
.page-about .about-position__media{
  position: relative;
  margin-top: 1rem;
}
.page-about .about-position__img{
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid rgba(176,140,45,.25);
}
.page-about .about-position__media figcaption{
  margin-top: .75rem;
  font-size: var(--font-label);
  font-family: var(--font-mono);
  color: var(--gray-muted);
  letter-spacing: .05em;
}

/* ========== 02 · 发展历程 ========== */
.page-about .about-history{
  background: var(--white);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  border-top: 1px solid rgba(176,140,45,.2);
  border-bottom: 1px solid rgba(176,140,45,.2);
}
.page-about .section-head{
  max-width: 680px;
  margin-bottom: 2.5rem;
}
.page-about .section-head__title{
  font-family: var(--font-heading);
  font-size: var(--font-h2);
  font-weight: 700;
  margin: .75rem 0 .5rem;
  line-height: 1.25;
}
.page-about .section-head__desc{
  color: var(--ink-soft);
  font-size: var(--font-caption);
  line-height: 1.8;
}
.page-about .about-history__timeline{
  display: grid;
  gap: 1.5rem;
}
.page-about .about-history__item{
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 1.25rem;
  align-items: start;
  position: relative;
}
.page-about .about-history__year{
  font-family: var(--font-mono);
  font-size: var(--font-label);
  color: var(--gold);
  line-height: 1.5;
  border-right: 1px solid var(--about-gold-line);
  padding-right: 1rem;
  text-align: right;
  padding-top: .5rem;
  white-space: nowrap;
}
.page-about .about-history__card{
  position: relative;
  background: var(--paper);
  border: 1px solid rgba(176,140,45,.28);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.4rem;
  box-shadow: var(--about-shadow);
}
.page-about .about-history__card::before{
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 14px;
  height: 14px;
  border-left: 2px solid var(--gold);
  border-top: 2px solid var(--gold);
  border-top-left-radius: var(--radius);
}
.page-about .about-history__card h3{
  font-family: var(--font-heading);
  font-size: 1.05rem;
  margin: .75rem 0 .5rem;
  font-weight: 700;
}
.page-about .about-history__card p{
  font-size: .875rem;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}
.page-about .about-history__card .tag{
  margin-bottom: .25rem;
}

/* ========== 03 · 栏目演进 ========== */
.page-about .about-evolution{
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  background:
    linear-gradient(180deg, rgba(176,140,45,.05), transparent 30%),
    var(--paper);
}
.page-about .about-evolution__track{
  display: grid;
  gap: 1.5rem;
  margin-top: 1rem;
}
.page-about .about-evolution__card{
  background: var(--white);
  border: 1px solid rgba(176,140,45,.28);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--about-shadow);
  position: relative;
}
.page-about .about-evolution__card--current{
  border-color: rgba(166,44,44,.35);
  background:
    linear-gradient(135deg, rgba(176,140,45,.06), transparent 60%),
    var(--white);
}
.page-about .about-evolution__card--current::before{
  content: "当前版本";
  position: absolute;
  top: -.75rem;
  right: 1.25rem;
  background: var(--red);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .06em;
  padding: .28rem .7rem;
  border-radius: 2px;
  box-shadow: 0 4px 10px rgba(166,44,44,.25);
}
.page-about .about-evolution__version{
  font-family: var(--font-mono);
  font-size: 1.75rem;
  line-height: 1;
  color: var(--gold);
  margin-bottom: 1rem;
}
.page-about .about-evolution__content h3{
  font-family: var(--font-heading);
  font-size: var(--font-h3);
  margin: .75rem 0 .5rem;
}
.page-about .about-evolution__content p{
  font-size: .875rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
}
.page-about .about-evolution__list{
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: .55rem;
}
.page-about .about-evolution__list li{
  position: relative;
  padding-left: 1.25rem;
  font-size: .875rem;
  line-height: 1.6;
  color: var(--ink);
  border-bottom: 1px dashed rgba(28,37,48,.08);
  padding-bottom: .55rem;
}
.page-about .about-evolution__list li:last-child{
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-evolution__list li::before{
  content: "▹";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--gold);
  font-family: var(--font-mono);
}
.page-about .about-evolution__media{
  margin-top: 1.5rem;
}
.page-about .about-evolution__media img{
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid rgba(176,140,45,.25);
  display: block;
}
.page-about .about-evolution__media figcaption{
  margin-top: .5rem;
  font-family: var(--font-mono);
  font-size: var(--font-label);
  color: var(--gray-muted);
}

/* ========== 04 · 内容理念 ========== */
.page-about .about-principles{
  background: var(--white);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  border-top: 1px solid rgba(28,37,48,.06);
  border-bottom: 1px solid rgba(28,37,48,.06);
}
.page-about .about-principles__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.page-about .about-principles__item{
  background: var(--paper);
  border: 1px solid rgba(176,140,45,.22);
  border-radius: var(--radius);
  padding: 1.75rem;
  position: relative;
}
.page-about .about-principles__num{
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--red);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid rgba(166,44,44,.4);
  border-radius: 50%;
  margin-bottom: 1rem;
}
.page-about .about-principles__item h3{
  font-family: var(--font-heading);
  font-size: var(--font-h3);
  margin: 0 0 .5rem;
}
.page-about .about-principles__item p{
  font-size: .875rem;
  line-height: 1.85;
  color: var(--ink-soft);
  margin: 0;
}
.page-about .about-principles__statement{
  border-top: 1px solid rgba(176,140,45,.25);
  padding-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: center;
  align-items: center;
}
.page-about .about-principles__statement p{
  max-width: 58ch;
  color: var(--ink-soft);
  font-size: .875rem;
  line-height: 1.8;
  margin: 0;
}

/* ========== 05 · 团队与组织 ========== */
.page-about .about-team{
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}
.page-about .about-team__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about .about-team__org{
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .about-team__item{
  background: var(--white);
  border: 1px solid rgba(28,37,48,.1);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  position: relative;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.page-about .about-team__item:hover{
  border-color: rgba(176,140,45,.5);
  box-shadow: var(--about-shadow);
}
.page-about .about-team__dept{
  font-family: var(--font-mono);
  font-size: var(--font-label);
  color: var(--gray-muted);
  letter-spacing: .06em;
}
.page-about .about-team__count{
  display: block;
  font-family: var(--font-heading);
  font-size: 2.25rem;
  line-height: 1.05;
  color: var(--red);
  margin: .5rem 0 .4rem;
}
.page-about .about-team__count small{
  font-size: 1rem;
  color: var(--gray-muted);
  margin-left: .15rem;
  font-family: var(--font-body);
  font-weight: 400;
}
.page-about .about-team__item p{
  font-size: .875rem;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
}
.page-about .about-team__media{
  margin-top: .5rem;
}
.page-about .about-team__media img{
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  border: 1px solid rgba(176,140,45,.25);
}
.page-about .about-team__media figcaption{
  margin-top: .5rem;
  font-family: var(--font-mono);
  font-size: var(--font-label);
  color: var(--gray-muted);
}

/* ========== 06 · 资质与认证 ========== */
.page-about .about-qualification{
  background: var(--blue-deep);
  color: var(--white);
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
}
.page-about .about-qualification .section-head__title,
.page-about .about-qualification .section-head__desc{
  color: var(--white);
}
.page-about .about-qualification__grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.page-about .about-qualification__item{
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(255,255,255,.04);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: background var(--transition), border-color var(--transition);
}
.page-about .about-qualification__item:hover{
  background: rgba(255,255,255,.08);
  border-color: rgba(219,191,107,.5);
}
.page-about .about-qualification__badge{
  display: inline-block;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  padding: .3rem .7rem;
  border-radius: 2px;
  margin-bottom: .9rem;
}
.page-about .about-qualification__item h3{
  font-family: var(--font-heading);
  font-size: 1rem;
  margin: 0 0 .5rem;
  color: var(--white);
}
.page-about .about-qualification__item p{
  font-size: .85rem;
  line-height: 1.75;
  color: rgba(255,255,255,.78);
  margin: 0;
}

/* ========== 结尾 CTA ========== */
.page-about .about-links{
  padding: clamp(2.5rem, 7vw, 5rem) 0;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(176,140,45,.18), rgba(176,140,45,.02)),
    var(--paper);
}
.page-about .about-links__inner{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}
.page-about .about-links__title{
  font-family: var(--font-heading);
  font-size: var(--font-h2);
  margin: 0;
}
.page-about .about-links__actions{
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  justify-content: center;
}
.page-about .about-links .btn--ghost{
  border-color: var(--ink);
  color: var(--ink);
}
.page-about .btn:focus-visible{
  outline: 2px solid var(--blue-bright);
  outline-offset: 2px;
}

/* ========== 响应式布局 ========== */
@media (min-width: 768px){
  .page-about .about-position__grid{
    grid-template-columns: 200px 1fr;
    gap: 3rem;
  }
  .page-about .about-position__rail{
    flex-direction: column;
    align-items: flex-start;
    gap: 2rem;
  }
  .page-about .about-position__stats{
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
  }
  .page-about .about-history__item{
    grid-template-columns: 160px 1fr;
    gap: 2rem;
  }
  .page-about .about-principles__grid{
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
  .page-about .about-principles__statement{
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  .page-about .about-team__grid{
    grid-template-columns: 7fr 5fr;
    gap: 2.5rem;
    align-items: start;
  }
  .page-about .about-team__org{
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-qualification__grid{
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
}

@media (min-width: 900px){
  .page-about .about-evolution__track{
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  .page-about .about-evolution__card--current{
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
  }
  .page-about .about-evolution__card--current .about-evolution__media{
    margin-top: 0;
  }
}