.page-about{
  --about-line: rgba(15,23,42,.16);
  --about-card-shadow: 5px 5px 0 0 rgba(15,23,42,.22);
  --about-soft: rgba(247,249,252,.14);
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-head);
  padding-bottom: calc(var(--dock-h) + 18px);
}

.page-about .about-wrap{
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero{
  position: relative;
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(90deg, var(--about-soft) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, var(--about-soft) 0 1px, transparent 1px 72px),
    radial-gradient(circle at 82% 18%, rgba(25,211,255,.22), transparent 58%),
    radial-gradient(circle at 12% 92%, rgba(255,90,31,.2), transparent 52%);
  color: var(--paper);
  border-bottom: 2px solid var(--graphite);
  padding: clamp(20px,4vw,34px) 0 clamp(26px,5vw,52px);
}

.page-about .about-hero .breadcrumb{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(247,249,252,.7);
  margin-bottom: clamp(16px,3vw,26px);
}

.page-about .about-hero .breadcrumb a{
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--mint);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible{
  color: var(--mint);
}

.page-about .about-hero__grid{
  display: grid;
  gap: calc(var(--gap) + 6px);
}

.page-about .about-hero__copy .kicker{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-hero__copy h1{
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px,6.4vw,58px);
  line-height: 1.16;
  letter-spacing: -.01em;
  margin: 0 0 16px;
  color: var(--paper);
}

.page-about .about-hero__copy .lede{
  font-size: clamp(15px,2.2vw,17px);
  line-height: 1.8;
  color: rgba(247,249,252,.86);
  margin: 0 0 22px;
  max-width: 46ch;
}

.page-about .about-hero__acts{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__stack{
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-stat{
  display: flex;
  align-items: baseline;
  gap: 12px;
  background: var(--paper);
  color: var(--graphite);
  border: 2px solid var(--graphite);
  box-shadow: var(--about-card-shadow);
  padding: 12px 14px;
}

.page-about .about-stat__num{
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px,4.6vw,30px);
  line-height: 1;
  color: var(--orange);
}

.page-about .about-stat__k{
  font-size: 13px;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- 目录 ---------- */
.page-about .about-toc{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: clamp(16px,3vw,24px);
  padding-bottom: clamp(16px,3vw,24px);
}

.page-about .about-toc a{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  color: var(--graphite);
  text-decoration: none;
  background: #fff;
  border: 2px solid var(--graphite);
  box-shadow: 3px 3px 0 rgba(15,23,42,.18);
  padding: 7px 11px;
  transition: background 160ms var(--ease), color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible{
  background: var(--ink);
  color: var(--paper);
  transform: translate(-1px,-1px);
}

.page-about .about-toc__idx{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--orange);
}

.page-about .about-toc a:hover .about-toc__idx,
.page-about .about-toc a:focus-visible .about-toc__idx{
  color: var(--mint);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec{
  padding: clamp(28px,5vw,56px) 0;
  border-top: 2px solid var(--about-line);
}

.page-about .about-sec:first-of-type{
  border-top: 0;
}

.page-about .about-sec__grid{
  display: grid;
  gap: var(--gap);
}

.page-about .about-rail{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-rail__num{
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 26px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-rail__label{
  font-size: 14px;
  font-weight: 900;
  letter-spacing: .04em;
  color: var(--slate);
}

.page-about .about-rail__note{
  flex-basis: 100%;
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--gray);
}

.page-about .about-main h2{
  font-size: clamp(22px,4.4vw,34px);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0 0 14px;
  color: var(--graphite);
}

.page-about .about-lead{
  font-size: 16px;
  line-height: 1.85;
  color: var(--slate);
  margin: 0 0 clamp(18px,3vw,26px);
  max-width: 62ch;
}

.page-about .about-main a{
  color: var(--graphite);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
}

.page-about .about-main a:hover,
.page-about .about-main a:focus-visible{
  background: var(--amber);
}

/* ---------- 使命条目 ---------- */
.page-about .about-pillars{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 2px solid var(--graphite);
}

.page-about .about-pillar{
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 2px solid var(--about-line);
}

.page-about .about-pillar__idx{
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  background: var(--mint);
  border: 2px solid var(--graphite);
  padding: 3px 6px;
  height: 26px;
}

.page-about .about-pillar h3{
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 900;
  color: var(--graphite);
}

.page-about .about-pillar p{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 图形 ---------- */
.page-about .about-figure{
  margin: 0 0 clamp(18px,3vw,26px);
  border: 2px solid var(--graphite);
  background: var(--ink);
  box-shadow: var(--about-card-shadow);
}

.page-about .about-figure img{
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-figure figcaption{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: rgba(247,249,252,.76);
  background: var(--ink);
  padding: 9px 12px;
  border-top: 1px solid rgba(247,249,252,.2);
}

/* ---------- 数据条 ---------- */
.page-about .about-facts{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px,1fr));
  gap: 10px;
  margin-bottom: clamp(18px,3vw,26px);
}

.page-about .about-fact{
  border: 2px solid var(--graphite);
  background: var(--ink);
  color: var(--paper);
  padding: 12px 14px;
}

.page-about .about-fact__num{
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.1;
  color: var(--mint);
}

.page-about .about-fact__k{
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(247,249,252,.76);
}

/* ---------- 分段切换 ---------- */
.page-about .about-tabs{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: stretch;
}

.page-about .about-tabs input[type="radio"]{
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-tabs label{
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .02em;
  padding: 8px 12px;
  border: 2px solid var(--graphite);
  background: #fff;
  color: var(--graphite);
  cursor: pointer;
  box-shadow: 3px 3px 0 rgba(15,23,42,.18);
  transition: background 160ms var(--ease), color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-tabs input:checked + label{
  background: var(--orange);
  color: var(--ink);
  transform: translate(-1px,-1px);
  box-shadow: 4px 4px 0 rgba(15,23,42,.3);
}

.page-about .about-tabs input:focus-visible + label{
  outline: 3px solid var(--violet);
  outline-offset: 2px;
}

.page-about .about-tabpanel{
  flex: 0 0 100%;
  display: none;
  margin-top: 6px;
  border: 2px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  padding: 16px 18px;
  box-shadow: var(--about-card-shadow);
}

.page-about .about-tabpanel h3{
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 900;
  color: var(--mint);
}

.page-about .about-tabpanel p{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247,249,252,.88);
}

.page-about .about-tabpanel a{
  color: var(--paper);
  border-bottom-color: var(--amber);
}

.page-about .about-tabpanel a:hover,
.page-about .about-tabpanel a:focus-visible{
  background: var(--amber);
  color: var(--ink);
}

.page-about #about-r-east:checked ~ #about-p-east,
.page-about #about-r-south:checked ~ #about-p-south,
.page-about #about-r-north:checked ~ #about-p-north,
.page-about #about-r-west:checked ~ #about-p-west,
.page-about #about-t-eng:checked ~ #about-p-eng,
.page-about #about-t-member:checked ~ #about-p-member,
.page-about #about-t-change:checked ~ #about-p-change,
.page-about #about-t-partner:checked ~ #about-p-partner{
  display: block;
}

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

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

/* ---------- 质量 ---------- */
.page-about .about-quality{
  display: grid;
  gap: var(--gap);
}

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

.page-about .about-fold{
  border: 2px solid var(--graphite);
  background: #fff;
  box-shadow: var(--about-card-shadow);
  margin-bottom: 10px;
}

.page-about .about-fold summary{
  display: flex;
  align-items: baseline;
  gap: 10px;
  cursor: pointer;
  list-style: none;
  padding: 12px 14px;
  font-size: 15px;
  font-weight: 900;
  color: var(--graphite);
}

.page-about .about-fold summary::-webkit-details-marker{
  display: none;
}

.page-about .about-fold summary::after{
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-fold[open] summary::after{
  content: "–";
}

.page-about .about-fold[open] summary{
  background: var(--slate);
  color: var(--paper);
}

.page-about .about-fold[open] summary::after{
  color: var(--amber);
}

.page-about .about-fold summary:focus-visible{
  outline: 3px solid var(--violet);
  outline-offset: -3px;
}

.page-about .about-fold__idx{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .about-fold[open] .about-fold__idx{
  color: var(--amber);
}

.page-about .about-fold__body{
  padding: 12px 14px 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--slate);
}

/* ---------- 时间轴 ---------- */
.page-about .about-sec--rhythm{
  background: var(--ink);
  color: var(--paper);
  border-top: 2px solid var(--graphite);
}

.page-about .about-sec--rhythm .about-rail__num{
  color: var(--amber);
}

.page-about .about-sec--rhythm .about-rail__label{
  color: var(--paper);
}

.page-about .about-sec--rhythm .about-rail__note,
.page-about .about-sec--rhythm .about-lead{
  color: rgba(247,249,252,.76);
}

.page-about .about-sec--rhythm .about-main h2{
  color: var(--paper);
}

.page-about .about-time{
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-time::before{
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: repeating-linear-gradient(180deg, var(--cyan) 0 6px, transparent 6px 13px);
}

.page-about .about-time__item{
  position: relative;
  padding: 0 0 22px;
}

.page-about .about-time__item:last-child{
  padding-bottom: 0;
}

.page-about .about-time__item::before{
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--amber);
  border: 2px solid var(--ink);
  box-shadow: 0 0 0 2px var(--amber);
}

.page-about .about-time__tag{
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--ink);
  background: var(--amber);
  padding: 3px 8px;
  margin-bottom: 8px;
}

.page-about .about-time__item h3{
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-time__item p{
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(247,249,252,.82);
  max-width: 60ch;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta{
  background: var(--paper);
  border-top: 2px solid var(--graphite);
  padding: clamp(26px,5vw,48px) 0;
}

.page-about .about-cta__inner{
  display: grid;
  gap: 18px;
  align-items: start;
}

.page-about .about-cta__kicker{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--orange);
  margin: 0 0 8px;
}

.page-about .about-cta h2{
  font-size: clamp(20px,4vw,28px);
  font-weight: 900;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--graphite);
}

.page-about .about-cta__text{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 54ch;
}

.page-about .about-cta__acts{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px){
  .page-about .about-hero__stack{
    grid-template-columns: repeat(2, minmax(0,1fr));
  }
  .page-about .about-stat:nth-child(2){
    transform: translateY(8px);
  }
  .page-about .about-stat:nth-child(4){
    transform: translateY(8px);
  }
  .page-about .about-cta__inner{
    grid-template-columns: minmax(0,1.2fr) minmax(0,.8fr);
    gap: var(--gap);
  }
}

@media (min-width: 900px){
  .page-about .about-hero__grid{
    grid-template-columns: minmax(0,1.25fr) minmax(0,.75fr);
    gap: calc(var(--gap) + 16px);
    align-items: start;
  }
  .page-about .about-sec__grid{
    grid-template-columns: minmax(160px,3fr) minmax(0,9fr);
    gap: calc(var(--gap) + 10px);
  }
  .page-about .about-rail{
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .page-about .about-rail__num{
    font-size: clamp(38px,4vw,54px);
  }
  .page-about .about-team{
    grid-template-columns: minmax(0,1.15fr) minmax(0,.85fr);
    align-items: start;
  }
  .page-about .about-quality{
    grid-template-columns: minmax(0,1.2fr) minmax(0,.8fr);
    align-items: start;
  }
  .page-about .about-hero__stack{
    grid-template-columns: minmax(0,1fr);
    padding-top: 34px;
  }
  .page-about .about-stat:nth-child(2){
    margin-left: 22px;
    transform: none;
  }
  .page-about .about-stat:nth-child(3){
    margin-left: 8px;
    transform: none;
  }
  .page-about .about-stat:nth-child(4){
    margin-left: 30px;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce){
  .page-about .about-toc a,
  .page-about .about-tabs label{
    transition: none;
  }
  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible,
  .page-about .about-tabs input:checked + label{
    transform: none;
  }
}
</main>