.page-about{
  --about-accent: var(--color-spring);
  --about-soft-line: var(--color-fog);
  --about-border: var(--color-line);
  background: var(--color-paper);
  font-family: var(--font-sans);
}
.page-about *{
  box-sizing: border-box;
}
.page-about h1,
.page-about h2,
.page-about h3,
.page-about h4{
  font-family: var(--font-serif);
  text-wrap: balance;
}
.page-about img{
  max-width: 100%;
  height: auto;
  display: block;
}
.page-about .section-anno{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--color-muted);
  writing-mode: vertical-rl;
  text-orientation: upright;
  border: 1px solid var(--color-fog);
  padding: 10px 6px;
  min-height: 92px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.page-about .section-kicker{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--about-accent);
  margin: 0 0 8px;
}
.page-about .section-desc{
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
  max-width: 640px;
  margin: 12px 0 0;
}
.page-about .page-wrap{
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ===== hero ===== */
.page-about .profile-hero{
  position: relative;
  overflow: hidden;
  background: var(--color-winter);
  border-bottom: 2px solid var(--color-ink);
}
.page-about .hero-frame{
  display: grid;
  grid-template-columns: 1fr;
  max-width: var(--container);
  margin: 0 auto;
  padding: 28px 20px 48px;
  position: relative;
  z-index: 1;
}
.page-about .breadcrumb{
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: .05em;
}
.page-about .breadcrumb a{
  color: var(--color-ink);
  text-decoration-color: var(--color-fog);
}
.page-about .hero-kicker{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--about-accent);
  margin: 30px 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .hero-kicker::before{
  content: "";
  width: 40px;
  height: 1px;
  background: var(--about-accent);
  display: inline-block;
}
.page-about h1{
  font-size: clamp(44px, 9vw, 88px);
  line-height: .95;
  margin: 0;
  color: var(--color-ink);
  letter-spacing: .04em;
}
.page-about .hero-vertical{
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .6em;
  color: var(--color-muted);
  height: 104px;
  margin: 14px 0 6px;
  padding-left: 8px;
  border-left: 1px solid var(--color-fog);
}
.page-about .hero-lead{
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-ink);
  max-width: 620px;
}
.page-about .hero-stats{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--color-fog);
  border: 1px solid var(--color-fog);
  margin-top: 28px;
  max-width: 560px;
}
.page-about .hero-stats > div{
  background: var(--color-winter);
  padding: 14px 16px;
}
.page-about .hero-stats dt{
  font-size: 12px;
  color: var(--color-muted);
  margin-bottom: 4px;
}
.page-about .hero-stats dd{
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0;
}
.page-about .hero-figure{
  position: relative;
  margin-top: 30px;
  border: 2px solid var(--color-ink);
}
.page-about .hero-figure .hero-img{
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .hero-figure-caption{
  position: absolute;
  left: 0;
  bottom: 0;
  background: var(--color-ink);
  color: var(--color-paper);
  font-size: 11px;
  letter-spacing: .12em;
  padding: 8px 12px;
  font-family: var(--font-mono);
  margin: 0;
}
.page-about .hero-seal{
  position: absolute;
  top: 24px;
  right: 24px;
  width: 54px;
  height: 54px;
  border: 2px solid var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--color-ink);
  transform: rotate(8deg);
  z-index: 2;
  background: var(--color-paper);
  box-shadow: 2px 2px 0 var(--color-fog);
}
.page-about .hero-rule{
  position: absolute;
  left: -40px;
  bottom: 32px;
  width: 320px;
  height: 2px;
  background: var(--color-ink);
  opacity: .35;
  transform: rotate(-8deg);
  z-index: 0;
}

/* ===== toc ===== */
.page-about .profile-toc{
  position: sticky;
  top: var(--topbar-h);
  z-index: 30;
  background: var(--color-ink);
  color: var(--color-paper);
}
.page-about .profile-toc .toc-inner{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 20px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 10px 20px;
}
.page-about .profile-toc .toc-title{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--color-fog);
}
.page-about .profile-toc a{
  color: var(--color-winter);
  text-decoration: none;
  font-size: 13px;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .profile-toc a:hover,
.page-about .profile-toc a.is-active{
  color: var(--about-accent);
  border-bottom-color: var(--about-accent);
}

/* ===== origin ===== */
.page-about .origin-section{
  padding: 56px 0 60px;
  border-bottom: 1px solid var(--color-fog);
}
.page-about .origin-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .origin-main h2{
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.35;
  color: var(--color-ink);
  margin: 0 0 16px;
}
.page-about .origin-lead{
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-ink);
  margin: 0 0 14px;
}
.page-about .origin-main p:not(.origin-lead):not(.section-kicker){
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-muted);
  margin: 0 0 14px;
}
.page-about .origin-principle{
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--color-ink);
  border-left: 3px solid var(--about-accent);
  padding: 6px 0 6px 16px;
  margin: 22px 0 0;
}

/* ===== service ===== */
.page-about .service-thread{
  background: var(--color-winter);
  border-bottom: 2px solid var(--color-ink);
  padding: 56px 0 64px;
}
.page-about .section-head{
  margin-bottom: 32px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}
.page-about .section-head h2{
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.4;
  color: var(--color-ink);
  margin: 0;
}
.page-about .module-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 2px solid var(--color-ink);
}
.page-about .module-card{
  position: relative;
  border: 1px solid var(--color-line);
  border-top: 1px solid var(--color-line);
  padding: 24px 20px 20px;
  background: var(--color-paper);
}
.page-about .module-card::before{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--about-accent);
}
.page-about .module-card:nth-child(3n+2)::before{
  background: var(--color-summer);
}
.page-about .module-card:nth-child(3n+3)::before{
  background: var(--color-autumn);
}
.page-about .module-label{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--color-muted);
  display: block;
  margin-bottom: 10px;
}
.page-about .module-card h3{
  font-size: 20px;
  margin: 0 0 10px;
  color: var(--color-ink);
}
.page-about .module-card p{
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-muted);
  margin: 0;
}
.page-about .service-chain{
  margin-top: 28px;
  border: 1px solid var(--color-line);
  background: var(--color-paper);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}
.page-about .service-chain p{
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-ink);
  margin: 0;
}

/* ===== milestone ===== */
.page-about .milestone-section{
  padding: 64px 0;
  background:
    linear-gradient(90deg, rgba(16, 19, 18, .045) 1px, transparent 1px),
    linear-gradient(rgba(16, 19, 18, .045) 1px, transparent 1px);
  background-size: 24px 24px;
}
.page-about .timeline{
  position: relative;
  max-width: 920px;
  margin: 0 auto;
}
.page-about .timeline-track{
  position: absolute;
  left: 24px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--color-line);
}
.page-about .milestone-item{
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding-bottom: 18px;
}
.page-about .milestone-meta{
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  padding-top: 6px;
}
.page-about .milestone-year{
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-ink);
  background: var(--color-paper);
  padding: 2px 4px;
  z-index: 2;
}
.page-about .milestone-node{
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 7px solid var(--about-accent);
  margin-top: 5px;
  z-index: 2;
}
.page-about .milestone-content{
  border-bottom: 1px solid var(--color-fog);
  padding-bottom: 16px;
}
.page-about .milestone-toggle{
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  width: 100%;
  text-align: left;
}
.page-about .milestone-title{
  font-weight: 700;
}
.page-about .milestone-badge{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  padding: 3px 8px;
  border: 1px solid var(--color-fog);
  color: var(--color-muted);
}
.page-about .faq-icon{
  width: 16px;
  height: 16px;
  position: relative;
  margin-left: auto;
  flex-shrink: 0;
}
.page-about .faq-icon::before,
.page-about .faq-icon::after{
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: var(--color-ink);
  transition: transform var(--dur) var(--ease);
}
.page-about .faq-icon::before{
  width: 12px;
  height: 1px;
  transform: translate(-50%, -50%);
}
.page-about .faq-icon::after{
  width: 1px;
  height: 12px;
  transform: translate(-50%, -50%);
}
.page-about .milestone-toggle[aria-expanded="false"] .faq-icon::after{
  transform: translate(-50%, -50%) scaleY(0);
}
.page-about .milestone-detail{
  padding-top: 10px;
  max-width: 640px;
}
.page-about .milestone-detail p{
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
  margin: 0;
}
.page-about [data-faq-toggle][aria-expanded="false"] + [data-faq-panel]{
  display: none;
}

/* ===== team ===== */
.page-about .team-section{
  background: var(--color-ink);
  color: var(--color-paper);
  padding: 56px 0 64px;
}
.page-about .team-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
.page-about .team-section .section-anno{
  color: var(--color-fog);
  border-color: rgba(201, 197, 188, .35);
}
.page-about .team-main h2{
  font-size: clamp(22px, 3.2vw, 34px);
  color: var(--color-paper);
  margin: 0 0 16px;
}
.page-about .team-lead{
  color: var(--color-winter);
  font-size: 15px;
  line-height: 1.9;
  margin: 0 0 24px;
  max-width: 600px;
}
.page-about .team-count-block{
  display: flex;
  align-items: center;
  gap: 20px;
  border: 1px solid rgba(244, 242, 235, .3);
  padding: 20px;
  max-width: 300px;
  background: rgba(244, 242, 235, .04);
}
.page-about .team-count-icon{
  width: 56px;
  height: 56px;
  border: 1px solid var(--about-accent);
  color: var(--about-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 26px;
  flex-shrink: 0;
}
.page-about .team-count-num{
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 700;
  color: var(--color-paper);
  line-height: 1;
}
.page-about .team-count-num span{
  color: var(--about-accent);
  font-size: 24px;
  vertical-align: super;
}
.page-about .team-count-label{
  display: block;
  color: var(--color-fog);
  font-size: 13px;
  margin-top: 4px;
  letter-spacing: .08em;
}
.page-about .team-disciplines{
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  border-top: 1px solid rgba(244, 242, 235, .28);
}
.page-about .team-disciplines li{
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 4px;
  border-bottom: 1px solid rgba(244, 242, 235, .28);
  font-size: 14px;
}
.page-about .team-disciplines span:first-child{
  color: var(--color-paper);
  font-weight: 700;
  flex-shrink: 0;
}
.page-about .team-disciplines span:last-child{
  color: var(--color-fog);
  text-align: right;
}

/* ===== certification ===== */
.page-about .certification-block{
  position: relative;
  background: var(--color-winter);
  border-bottom: 2px solid var(--color-ink);
  padding: 64px 0 0;
  overflow: hidden;
}
.page-about .cert-bg{
  position: absolute;
  top: 0;
  right: 0;
  width: 280px;
  height: 280px;
  opacity: .12;
  pointer-events: none;
}
.page-about .cert-bg img{
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .certification-block .page-wrap{
  position: relative;
  z-index: 1;
}
.page-about .cert-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 28px 0;
}
.page-about .cert-card{
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  padding: 22px;
  position: relative;
  min-height: 140px;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .cert-card::after{
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: var(--about-accent);
}
.page-about .cert-card:hover{
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 var(--color-ink);
}
.page-about .cert-index{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  display: block;
  margin-bottom: 14px;
}
.page-about .cert-card h3{
  font-size: 18px;
  color: var(--color-ink);
  margin: 0 0 10px;
}
.page-about .cert-card p{
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-muted);
  margin: 0;
}
.page-about .honor-strip{
  border: 1px solid var(--color-line);
  background: var(--color-ink);
  color: var(--color-paper);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 48px;
}
.page-about .honor-strip p{
  font-family: var(--font-serif);
  font-size: 15px;
  margin: 0;
  color: var(--color-winter);
}

/* ===== partners ===== */
.page-about .partners-section{
  padding-bottom: 60px;
}
.page-about .partners-layout{
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 28px;
}
.page-about .partners-copy h3{
  font-size: 22px;
  color: var(--color-ink);
  margin: 0 0 12px;
}
.page-about .partners-copy p{
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-muted);
  margin: 0;
  max-width: 520px;
}
.page-about .partners-figure{
  margin: 0;
  border: 1px solid var(--color-line);
}
.page-about .partners-figure img{
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .partners-figure figcaption{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--color-muted);
  padding: 10px 12px;
  border-top: 1px solid var(--color-fog);
  background: var(--color-paper);
}
.page-about .partners-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .partner-tile{
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  padding: 20px;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .partner-tile:hover{
  transform: translateY(-2px);
  box-shadow: 4px 4px 0 var(--color-ink);
}
.page-about .partner-tile h4{
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--color-ink);
  margin: 0 0 8px;
}
.page-about .partner-tile p{
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-muted);
  margin: 12px 0 0;
}

/* ===== governance ===== */
.page-about .governance-section{
  background: var(--color-paper);
  padding: 64px 0;
  border-bottom: 2px solid var(--color-ink);
}
.page-about .governance-grid{
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
.page-about .governance-copy h2{
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.4;
  color: var(--color-ink);
  margin: 0 0 16px;
}
.page-about .governance-copy > p:not(.section-anno){
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-muted);
  margin: 0;
  max-width: 520px;
}
.page-about .governance-list{
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--color-fog);
  border: 1px solid var(--color-fog);
}
.page-about .governance-list article{
  background: var(--color-paper);
  padding: 20px;
}
.page-about .governance-list h3{
  font-size: 17px;
  font-family: var(--font-serif);
  margin: 0 0 8px;
  color: var(--color-ink);
}
.page-about .governance-list p{
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-muted);
  margin: 0;
}
.page-about .governance-links{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  grid-column: 1;
}
.page-about .governance-links a{
  border: 1px solid var(--color-line);
  padding: 10px 16px;
  text-decoration: none;
  color: var(--color-ink);
  background: var(--color-paper);
  font-size: 13px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .governance-links a:hover{
  background: var(--color-ink);
  color: var(--color-paper);
}

/* ===== tablet ===== */
@media (min-width: 640px){
  .page-about .hero-stats{
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .module-grid{
    grid-template-columns: 1fr 1fr;
    border-left: 1px solid var(--color-line);
    border-right: 1px solid var(--color-line);
  }
  .page-about .cert-grid{
    grid-template-columns: 1fr 1fr;
  }
  .page-about .partners-grid{
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .partners-layout{
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
  .page-about .governance-grid{
    grid-template-columns: 4fr 6fr;
  }
  .page-about .governance-links{
    grid-column: 2;
  }
  .page-about .team-disciplines{
    grid-template-columns: 1fr 1fr;
    column-gap: 32px;
  }
}

/* ===== desktop ===== */
@media (min-width: 992px){
  .page-about .hero-frame{
    grid-template-columns: 5fr 7fr;
    align-items: center;
    gap: 56px;
    padding: 56px 40px 80px;
  }
  .page-about .hero-copy{
    padding-bottom: 0;
  }
  .page-about .hero-figure{
    margin-top: 40px;
    margin-right: -24px;
  }
  .page-about .hero-seal{
    top: 40px;
    right: 56px;
  }
  .page-about .section-head{
    grid-template-columns: 200px 1fr;
    gap: 48px;
    align-items: start;
  }
  .page-about .origin-grid{
    grid-template-columns: 3fr 9fr;
    gap: 48px;
  }
  .page-about .module-grid{
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .module-card{
    border-left: 1px solid var(--color-line);
    border-right: 1px solid var(--color-line);
  }
  .page-about .cert-grid{
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .team-grid{
    grid-template-columns: 3fr 9fr;
    gap: 48px;
  }
  .page-about .timeline{
    max-width: 1000px;
    padding-left: 0;
  }
  .page-about .milestone-item{
    grid-template-columns: 96px 1fr;
    gap: 32px;
  }
  .page-about .milestone-toggle{
    font-size: 20px;
  }
  .page-about .milestone-detail{
    padding-top: 12px;
  }
  .page-about .governance-grid{
    grid-template-columns: 3fr 7fr;
    gap: 48px;
  }
  .page-about .governance-list article{
    padding: 24px;
  }
}