.page-about{
  --about-line: rgba(18,24,28,.14);
  --about-line-strong: rgba(18,24,28,.24);
  --about-line-dark: rgba(168,244,255,.20);
  --about-cyan-ink: #00697C;
  --about-orange-ink: #C6491A;
  --about-body: #3A4247;
  background: var(--paper);
  color: var(--text-dark);
}

/* ============ 外壳：左侧纵向刻度栏 ============ */
.page-about .about-shell{ display: block; }

.page-about .about-rail{ display: none; }

.page-about .about-rail-axis{
  width: 1px;
  height: 220px;
  background: linear-gradient(to bottom, transparent, var(--about-line-strong) 14%, var(--about-line-strong) 86%, transparent);
}

.page-about .about-rail-mark{
  color: #8A949A;
  font-size: 11px;
  letter-spacing: .12em;
}

@media (min-width: 1100px){
  .page-about .about-shell{
    display: grid;
    grid-template-columns: 76px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-rail{
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    padding: 56px 0 80px;
    position: sticky;
    top: calc(var(--header-h-compact) + 28px);
    align-self: start;
    height: max-content;
  }
  .page-about .about-rail-note{
    color: #8A949A;
    font-size: 11px;
    letter-spacing: .1em;
  }
}

/* ============ 首屏 ============ */
.page-about .about-hero{
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h-compact) + 34px) 0 62px;
}

.page-about .about-hero::after{
  content: "";
  position: absolute;
  right: -8%;
  top: 22%;
  width: 46vw;
  max-width: 560px;
  height: 46vw;
  max-height: 560px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(0,229,255,.17), rgba(0,229,255,0) 72%);
  pointer-events: none;
}

.page-about .about-crumbs{ position: relative; z-index: 1; }

.page-about .about-hero-grid{
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
  margin-top: 30px;
}

.page-about .about-kicker{
  margin: 0;
  color: var(--about-cyan-ink);
}

.page-about .about-h1{
  margin: 14px 0 22px;
  color: var(--ink);
  line-height: 1.03;
  letter-spacing: -.03em;
}

.page-about .about-h1-em{
  color: var(--about-cyan-ink);
  background: linear-gradient(to top, rgba(124,255,79,.6) 0 .16em, rgba(124,255,79,0) .16em);
}

.page-about .about-lead{
  max-width: 40em;
  margin: 0 0 26px;
  color: var(--about-body);
}

.page-about .about-hero-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero-panel{
  position: relative;
  background: var(--ink);
  color: var(--mist);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  padding: 24px 22px 20px;
  transform: rotate(-1deg);
  box-shadow: 0 24px 48px -34px rgba(11,15,18,.85);
}

.page-about .about-hero-panel::before{
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  background: linear-gradient(to bottom, var(--cyan), var(--lime) 58%, var(--orange));
  border-radius: 3px;
}

.page-about .about-panel-label{
  margin: 0 0 16px;
  color: var(--muted);
}

.page-about .about-panel-list{
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-about .about-panel-list li{
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-panel-list li:last-child{ border-bottom: none; }

.page-about .about-panel-num{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
  min-width: 64px;
}

.page-about .about-panel-name{
  font-size: 15px;
  color: var(--mist);
}

.page-about .about-panel-foot{
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
}

@media (min-width: 900px){
  .page-about .about-hero{ padding-bottom: 84px; }
  .page-about .about-hero-grid{
    grid-template-columns: minmax(0, 1.4fr) minmax(300px, .8fr);
    gap: 60px;
    align-items: end;
  }
}

/* ============ 通用小节头 ============ */
.page-about .about-sec-tag{
  margin: 0 0 14px;
  color: var(--about-cyan-ink);
}

.page-about .about-sec-head{ max-width: 44em; }

.page-about .about-sec-title{
  margin: 0 0 16px;
  color: var(--ink);
}

.page-about .about-sec-lead{
  margin: 0;
  color: var(--about-body);
}

.page-about .about-sec-head--dark .about-sec-tag{ color: var(--cyan); }
.page-about .about-sec-head--dark .about-sec-title{ color: #FFFFFF; }
.page-about .about-sec-head--dark .about-sec-lead{ color: var(--muted); }

/* ============ 01 主张 ============ */
.page-about .about-claim-grid{
  display: grid;
  gap: 34px;
  margin-top: 8px;
}

.page-about .about-claim-word{
  position: relative;
  padding-left: 28px;
}

.page-about .about-claim-note{
  position: absolute;
  left: 0;
  top: 8px;
  color: #8A949A;
  font-size: 11px;
  letter-spacing: .12em;
}

.page-about .about-claim-title{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(46px, 10vw, 104px);
  line-height: .98;
  letter-spacing: -.045em;
  color: var(--ink);
}

.page-about .about-pulse{
  display: block;
  width: 200px;
  height: 34px;
  margin-top: 22px;
  color: var(--about-cyan-ink);
}

.page-about .about-claim-copy p{
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-claim-line{
  margin-top: 26px;
  padding-left: 18px;
  border-left: 3px solid var(--orange);
  font-weight: 600;
  color: var(--ink);
}

@media (min-width: 920px){
  .page-about .about-claim-grid{
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 74px;
    align-items: start;
  }
  .page-about .about-claim-word{ padding-left: 42px; }
}

/* ============ 02 团队 ============ */
.page-about .about-team-media{
  margin: 38px 0 40px;
}

.page-about .about-team-media .media{
  border: 1px solid var(--about-line);
}

.page-about .about-team-media .media-caption{
  margin-top: 12px;
  color: #6B757B;
}

.page-about .about-team-grid{
  display: grid;
  gap: 16px;
}

.page-about .about-team-card{
  position: relative;
  background: #FFFFFF;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 26px 22px 28px;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), border-color .16s var(--ease);
}

.page-about .about-team-card::before{
  content: "";
  position: absolute;
  left: 22px;
  top: 0;
  width: 40px;
  height: 3px;
  background: var(--ink);
}

.page-about .about-team-card:hover{
  transform: translateY(-2px);
  border-color: rgba(0,229,255,.55);
  box-shadow: 0 0 0 1px rgba(0,229,255,.32), 0 18px 36px -28px rgba(11,15,18,.7);
}

.page-about .about-team-num{
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 58px;
  line-height: 1;
  letter-spacing: -.045em;
  color: var(--ink);
  margin-bottom: 14px;
}

.page-about .about-team-card:nth-child(2) .about-team-num{ color: var(--about-cyan-ink); }
.page-about .about-team-card:nth-child(3) .about-team-num{ color: var(--about-orange-ink); }

.page-about .about-team-role{
  margin: 8px 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .07em;
  color: #5C666C;
}

.page-about .about-team-card p:last-child{
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

@media (min-width: 820px){
  .page-about .about-team-grid{
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }
}

/* ============ 03 三道关口 ============ */
.page-about .about-gate-list{
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-gate{
  position: relative;
  background: #FFFFFF;
  border: 1px solid var(--about-line);
  padding: 24px 20px 28px;
}

.page-about .about-gate + .about-gate{ margin-top: -1px; }

.page-about .about-gate-idx{
  display: block;
  margin-bottom: 14px;
  color: var(--about-orange-ink);
}

.page-about .about-gate-title{
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -.01em;
  color: var(--ink);
}

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

@media (min-width: 820px){
  .page-about .about-gate-list{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-about .about-gate + .about-gate{ margin-top: 0; margin-left: -1px; }
}

.page-about .about-readtime{
  margin-top: 46px;
  padding-top: 30px;
  border-top: 1px solid var(--about-line-strong);
  display: grid;
  gap: 20px;
}

.page-about .about-readtime-title{
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-readtime-list{
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-readtime-list li{
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-readtime-list li:last-child{ border-bottom: none; padding-bottom: 0; }

.page-about .about-readtime-tag{
  background: rgba(0,105,124,.10);
  color: var(--about-cyan-ink);
  border-color: rgba(0,105,124,.28);
  flex: 0 0 auto;
}

.page-about .about-readtime-text{
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-body);
}

@media (min-width: 820px){
  .page-about .about-readtime{
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

/* ============ 04 阶段 ============ */
.page-about .about-stages{
  position: relative;
  overflow: hidden;
}

.page-about .about-stages-grid{
  display: grid;
  gap: 42px;
  margin-top: 42px;
}

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

.page-about .about-stage-list::before{
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(to bottom, rgba(0,229,255,.7), rgba(124,255,79,.6) 55%, rgba(255,106,43,.7));
}

.page-about .about-stage{
  position: relative;
  padding-left: 36px;
  padding-bottom: 14px;
}

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

.page-about .about-stage::before{
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .about-stage-card{
  background: var(--ink-2);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  transition: border-color .16s var(--ease);
}

.page-about .about-stage-card:hover,
.page-about .about-stage-card[open]{
  border-color: rgba(0,229,255,.5);
}

.page-about .about-stage-card > summary{
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 17px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-stage-card > summary::-webkit-details-marker{ display: none; }

.page-about .about-stage-card > summary::after{
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-stage-card[open] > summary::after{ content: "−"; }

.page-about .about-stage-no{
  color: var(--cyan);
  font-size: 11px;
  letter-spacing: .1em;
}

.page-about .about-stage-name{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -.01em;
  color: #FFFFFF;
}

.page-about .about-stage-body{
  padding: 0 18px 20px;
}

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

.page-about .about-stage-media{
  margin: 0;
}

.page-about .about-stage-media .media{
  border: 1px solid var(--line-dark);
}

.page-about .about-stage-media .media-caption{
  margin-top: 12px;
  color: var(--muted);
}

@media (min-width: 1000px){
  .page-about .about-stages-grid{
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 68px;
    align-items: start;
  }
  .page-about .about-stage-media{
    margin-right: -44px;
    position: sticky;
    top: calc(var(--header-h-compact) + 32px);
  }
}

/* ============ 05 共建伙伴 ============ */
.page-about .about-partner-grid{
  display: grid;
  gap: 16px;
  margin-top: 38px;
}

.page-about .about-partner-card{
  position: relative;
  background: #FFFFFF;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  padding: 26px 22px 26px;
  overflow: hidden;
}

.page-about .about-partner-card::after{
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 48px;
  height: 3px;
  background: var(--orange);
}

.page-about .about-partner-num{
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 54px;
  line-height: 1;
  letter-spacing: -.045em;
  color: var(--ink);
  margin-bottom: 12px;
}

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

@media (min-width: 780px){
  .page-about .about-partner-grid{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.page-about .about-partner-media{
  margin: 42px 0 0;
}

.page-about .about-partner-media .media{
  border: 1px solid var(--about-line);
}

.page-about .about-partner-media .media-caption{
  margin-top: 12px;
  color: #6B757B;
}

.page-about .about-partner-link{
  margin: 26px 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--about-cyan-ink);
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-body);
}

.page-about .about-partner-link a{
  color: var(--about-cyan-ink);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-partner-link a:hover{ color: var(--about-orange-ink); }

@media (min-width: 900px){
  .page-about .about-partner-media{ margin-left: auto; max-width: 760px; }
}

/* ============ 06 团队日常 ============ */
.page-about .about-daily-grid{
  display: grid;
  gap: 24px;
  margin-top: 38px;
}

.page-about .about-daily-item{
  border-top: 2px solid var(--ink);
  padding-top: 18px;
}

.page-about .about-daily-when{
  display: block;
  margin-bottom: 10px;
  color: var(--about-orange-ink);
}

.page-about .about-daily-name{
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--ink);
}

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

.page-about .about-daily-note{
  margin: 34px 0 0;
  padding: 18px 20px;
  background: rgba(0,105,124,.07);
  border-left: 3px solid var(--about-cyan-ink);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

@media (min-width: 840px){
  .page-about .about-daily-grid{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ============ CTA ============ */
.page-about .about-cta{
  padding: 62px 0;
}

.page-about .about-cta-inner{
  display: grid;
  gap: 26px;
}

.page-about .about-cta-tag{
  margin: 0 0 12px;
  color: var(--cyan);
}

.page-about .about-cta-title{
  margin: 0;
  color: #FFFFFF;
}

.page-about .about-cta-actions{
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 860px){
  .page-about .about-cta-inner{
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 48px;
  }
  .page-about .about-cta-actions{ justify-content: flex-end; }
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion: reduce){
  .page-about .about-team-card,
  .page-about .about-stage-card{
    transition: none;
  }
  .page-about .about-team-card:hover{
    transform: none;
  }
  .page-about .about-hero-panel{
    transform: none;
  }
}