.page-about{
  --about-rail-w:132px;
}

.page-about .about-hero{
  padding-block: clamp(20px,4vw,40px) 0;
}

.page-about .about-frame{
  position:relative;
  border:1px solid var(--line-strong);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(169,192,199,.16), rgba(244,239,230,0) 62%),
    var(--paper);
  padding: clamp(24px,5vw,64px) clamp(20px,4vw,56px) clamp(28px,5vw,60px);
}

.page-about .about-frame::before{
  content:"";
  position:absolute;
  inset:6px;
  border:1px solid var(--line);
  pointer-events:none;
}

.page-about .about-frame::after{
  content:"";
  position:absolute;
  top:0;
  bottom:0;
  left:0;
  width:5px;
  background:repeating-linear-gradient(to bottom, var(--silver-2) 0 1px, transparent 1px 11px);
  opacity:.85;
  pointer-events:none;
}

.page-about .about-title{
  margin:18px 0 0;
  font-size:clamp(30px,6.2vw,74px);
  line-height:1.06;
  font-weight:300;
  letter-spacing:-.02em;
  color:var(--ink);
  overflow-wrap:break-word;
}

.page-about .about-title strong{
  font-weight:700;
}

.page-about .about-title em{
  font-style:normal;
  color:var(--silver);
}

.page-about .about-lede{
  margin-top:clamp(16px,2.6vw,24px);
  max-width:44em;
  font-size:clamp(15px,1.5vw,18px);
  line-height:1.85;
  color:var(--ink-2);
}

.page-about .about-meta{
  display:flex;
  flex-wrap:wrap;
  gap:12px 32px;
  margin:clamp(24px,4vw,40px) 0 0;
  padding:18px 0 0;
  list-style:none;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
}

.page-about .about-meta li{
  display:flex;
  align-items:baseline;
  gap:8px;
}

.page-about .about-meta b{
  font-family:var(--font-mono);
  font-size:19px;
  font-weight:600;
  letter-spacing:0;
  color:var(--cinnabar);
}

.page-about .about-hero-media{
  margin:clamp(28px,5vw,56px) 0 0;
}

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

.page-about .about-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:0;
  padding-top:clamp(20px,3vw,36px);
}

.page-about .about-rail{
  position:static;
  display:flex;
  flex-direction:row;
  gap:4px;
  overflow-x:auto;
  align-self:stretch;
  padding:10px 0 14px;
  margin-bottom:8px;
  border-bottom:1px solid var(--line);
  scrollbar-width:none;
}

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

.page-about .about-rail a{
  flex:0 0 auto;
  padding:6px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
  text-decoration:none;
  white-space:nowrap;
  border:1px solid transparent;
  transition:color .18s var(--ease), background .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-rail a:hover{
  color:var(--ink);
  border-color:var(--line);
}

.page-about .about-rail a[aria-current="true"]{
  color:var(--cinnabar);
  background:rgba(232,179,158,.28);
  border-color:var(--cinnabar-2);
}

.page-about .about-body{
  min-width:0;
}

.page-about .about-section{
  padding-block:clamp(40px,6vw,76px);
  border-top:1px solid var(--line);
}

.page-about .about-section:first-child{
  border-top:0;
  padding-top:clamp(20px,3vw,36px);
}

.page-about .about-section--band{
  border:1px solid var(--line);
  background:var(--paper-2);
  padding:clamp(26px,4.4vw,50px) clamp(20px,4vw,44px);
  margin-block:clamp(28px,4.5vw,56px);
}

.page-about .about-h2{
  margin:14px 0 0;
  font-size:clamp(23px,3.4vw,40px);
  font-weight:400;
  line-height:1.28;
  letter-spacing:-.01em;
  color:var(--ink);
}

.page-about .about-h2 strong{
  font-weight:700;
}

.page-about .about-p{
  margin-top:18px;
  max-width:42em;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-2);
}

.page-about .about-p strong{
  color:var(--ink);
  font-weight:600;
}

.page-about .about-p a{
  color:var(--silver);
  text-decoration:none;
  border-bottom:1px solid var(--silver-2);
  transition:color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .about-p a:hover{
  color:var(--cinnabar);
  border-bottom-color:var(--cinnabar);
}

/* 团队 */
.page-about .about-crew-media{
  margin:clamp(20px,3vw,32px) 0 0;
}

.page-about .crew-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:14px;
  margin-top:clamp(22px,3.4vw,34px);
}

.page-about .crew-card{
  background:var(--paper);
  border:1px solid var(--line);
  border-top:2px solid var(--silver);
  padding:20px 20px 22px;
  transition:transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease);
}

.page-about .crew-card:hover{
  transform:translateY(-2px);
  box-shadow:0 8px 20px rgba(28,27,24,.08);
  border-color:var(--line-strong);
  border-top-color:var(--cinnabar);
}

.page-about .crew-num{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--gold);
}

.page-about .crew-name{
  margin:10px 0 0;
  font-size:17px;
  font-weight:600;
  line-height:1.5;
  color:var(--ink);
}

.page-about .crew-text{
  margin:10px 0 0;
  font-size:14px;
  line-height:1.8;
  color:var(--ink-2);
}

/* 方法 */
.page-about .method-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(26px,4vw,44px);
  margin-top:clamp(20px,3vw,30px);
  align-items:start;
}

.page-about .method-main{
  min-width:0;
}

.page-about .method-steps{
  list-style:none;
  margin:22px 0 0;
  padding:0 0 0 24px;
  border-left:1px solid var(--silver-2);
}

.page-about .method-steps li{
  position:relative;
  padding-bottom:20px;
}

.page-about .method-steps li:last-child{
  padding-bottom:0;
}

.page-about .method-steps li::before{
  content:"";
  position:absolute;
  left:-28px;
  top:7px;
  width:7px;
  height:7px;
  background:var(--paper);
  border:1px solid var(--silver);
  border-radius:50%;
}

.page-about .method-step-title{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  font-weight:600;
  color:var(--cinnabar);
}

.page-about .method-step-text{
  margin:6px 0 0;
  font-size:15px;
  line-height:1.8;
  color:var(--ink-2);
}

.page-about .method-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:14px 0 0;
  padding:0;
  list-style:none;
}

.page-about .method-tags .tag{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  padding:5px 10px;
  border:1px solid var(--silver-2);
  color:var(--silver);
  background:rgba(169,192,199,.14);
}

.page-about .method-cta{
  margin:26px 0 0;
}

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

/* 年表 */
.page-about .tl{
  margin-top:clamp(22px,3.4vw,32px);
  border-top:1px solid var(--line);
}

.page-about .tl-item{
  border-bottom:1px solid var(--line);
}

.page-about .tl-summary{
  display:grid;
  grid-template-columns:64px minmax(0,1fr) 20px;
  align-items:baseline;
  gap:12px;
  padding:18px 4px 18px 0;
  cursor:pointer;
  list-style:none;
  transition:background .18s var(--ease);
}

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

.page-about .tl-summary:hover{
  background:rgba(169,192,199,.14);
}

.page-about .tl-year{
  font-family:var(--font-mono);
  font-size:clamp(19px,2.6vw,26px);
  font-weight:500;
  color:var(--gold);
  transition:color .18s var(--ease);
}

.page-about .tl-name{
  font-size:15px;
  line-height:1.6;
  color:var(--ink);
}

.page-about .tl-mark{
  position:relative;
  width:12px;
  height:12px;
  justify-self:end;
}

.page-about .tl-mark::before,
.page-about .tl-mark::after{
  content:"";
  position:absolute;
  background:var(--silver);
  transition:transform .18s var(--ease), background .18s var(--ease);
}

.page-about .tl-mark::before{
  left:0;
  top:5px;
  width:12px;
  height:1px;
}

.page-about .tl-mark::after{
  left:5px;
  top:0;
  width:1px;
  height:12px;
}

.page-about .tl-item[open] .tl-mark::after{
  transform:scaleY(0);
}

.page-about .tl-item[open] .tl-year{
  color:var(--cinnabar);
}

.page-about .tl-item[open] .tl-mark::before{
  background:var(--cinnabar);
}

.page-about .tl-body{
  padding:0 24px 20px 76px;
}

.page-about .tl-body p{
  margin:0;
  max-width:40em;
  font-size:15px;
  line-height:1.85;
  color:var(--ink-2);
}

/* 数据 */
.page-about .stat-row{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:1px;
  margin-top:clamp(22px,3.4vw,32px);
  border:1px solid var(--line);
  background:var(--line);
}

.page-about .stat{
  background:var(--paper);
  padding:20px 20px 22px;
}

.page-about .stat-num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(26px,3.6vw,36px);
  font-weight:500;
  line-height:1.1;
  color:var(--ink);
  letter-spacing:-.01em;
}

.page-about .stat-num small{
  font-size:13px;
  font-weight:400;
  color:var(--mist);
  margin-left:5px;
  letter-spacing:0;
}

.page-about .stat-label{
  display:block;
  margin-top:8px;
  font-size:13px;
  line-height:1.6;
  color:var(--mist);
}

/* 收尾 */
.page-about .about-cta{
  margin-top:clamp(32px,5vw,56px);
  padding:clamp(26px,4vw,46px);
  border:1px solid var(--line-strong);
  border-left:3px solid var(--cinnabar);
  background:var(--paper-2);
}

.page-about .about-cta-title{
  margin:0;
  font-size:clamp(21px,2.6vw,30px);
  font-weight:400;
  letter-spacing:-.01em;
  color:var(--ink);
}

.page-about .about-cta-text{
  margin:12px 0 0;
  max-width:38em;
  font-size:15px;
  line-height:1.85;
  color:var(--ink-2);
}

.page-about .about-cta-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin:22px 0 0;
}

.page-about a:focus-visible,
.page-about summary:focus-visible{
  outline:2px solid var(--cinnabar);
  outline-offset:3px;
}

@media (min-width:640px){
  .page-about .stat-row{
    grid-template-columns:repeat(3, minmax(0,1fr));
  }
}

@media (min-width:720px){
  .page-about .crew-grid{
    grid-template-columns:repeat(2, minmax(0,1fr));
    gap:20px;
    padding-bottom:26px;
  }

  .page-about .crew-card:nth-child(even){
    margin-top:26px;
  }
}

@media (min-width:840px){
  .page-about .method-grid{
    grid-template-columns:minmax(0,1fr) 300px;
    gap:clamp(32px,4.5vw,56px);
  }
}

@media (min-width:900px){
  .page-about .about-layout{
    grid-template-columns:var(--about-rail-w) minmax(0,1fr);
    gap:clamp(32px,4.5vw,72px);
    padding-top:clamp(28px,4vw,52px);
  }

  .page-about .about-rail{
    flex-direction:column;
    gap:0;
    overflow:visible;
    position:sticky;
    top:calc(var(--header-h) + 28px);
    align-self:start;
    padding:0;
    margin-bottom:0;
    border-bottom:0;
  }

  .page-about .about-rail a{
    padding:9px 0 9px 14px;
    border:0;
    border-left:2px solid var(--line);
    font-size:11px;
    letter-spacing:.14em;
  }

  .page-about .about-rail a:hover{
    border-left-color:var(--silver);
    background:transparent;
  }

  .page-about .about-rail a[aria-current="true"]{
    border-left-color:var(--cinnabar);
    background:linear-gradient(90deg, rgba(194,78,42,.10), rgba(194,78,42,0) 78%);
  }

  .page-about .about-section{
    padding-block:clamp(46px,6vw,84px);
  }

  .page-about .tl-summary{
    grid-template-columns:92px minmax(0,1fr) 20px;
    padding:20px 8px 20px 0;
  }

  .page-about .tl-body{
    padding-left:104px;
    padding-bottom:22px;
  }
}

@media (prefers-reduced-motion:reduce){
  .page-about *,
  .page-about *::before,
  .page-about *::after{
    transition-duration:.01ms !important;
    animation-duration:.01ms !important;
  }

  .page-about .crew-card:hover{
    transform:none;
  }
}