:root{
  --bg:#fff;
  --paper:#fff;
  --panel:#f6f7f8;
  --line:#e5e7eb;
  --line-strong:#cfd4dc;
  --muted:#5f6368;
  --soft:#8a9099;
  --text:#1d1d1f;
  --heading:#050505;
  --accent:#1473e6;
  --accent-soft:#eef5ff;
  --mono:"SF Mono","Cascadia Mono","JetBrains Mono",ui-monospace,Menlo,monospace;
  --sans:"SF Pro Text","SF Pro Display","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,BlinkMacSystemFont,sans-serif;
}
*{box-sizing:border-box}
html{background:var(--bg);scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  text-rendering:geometricPrecision;
}
a{color:inherit;text-decoration:none}
::selection{background:var(--accent-soft);color:var(--heading)}

.site-header{
  position:fixed;
  z-index:40;
  top:16px;
  left:4vw;
  right:4vw;
  height:58px;
  padding:0 14px 0 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  border:1px solid rgba(10,18,30,.07);
  border-radius:18px;
  background:rgba(255,255,255,.82);
  color:var(--text);
  box-shadow:0 12px 34px rgba(17,24,39,.055),0 1px 0 rgba(255,255,255,.86) inset;
  backdrop-filter:blur(24px) saturate(1.08);
  -webkit-backdrop-filter:blur(24px) saturate(1.08);
}
.site-header:before{
  content:"";
  position:absolute;
  inset:1px;
  z-index:-1;
  border-radius:17px;
  background:linear-gradient(180deg,rgba(255,255,255,.72),rgba(255,255,255,.18));
  pointer-events:none;
}
.site-header>a,.site-header>span{
  font:650 10px/1 var(--mono);
  letter-spacing:.04em;
  text-transform:uppercase;
}
.identity{display:flex;align-items:center;gap:10px}
.identity>b{
  width:28px;
  height:28px;
  display:grid;
  place-items:center;
  border-radius:8px;
  background:var(--heading);
  color:#fff;
  font-weight:760;
  letter-spacing:-.04em;
}
.identity-avatar{width:28px;height:28px;flex:0 0 28px;object-fit:cover;border-radius:8px}
.identity>span{display:flex;flex-direction:column;gap:2px}
.identity strong{font:720 12px/1.05 var(--sans);letter-spacing:0;text-transform:none}
.identity small{color:var(--soft);font-size:8px;letter-spacing:.02em}
.site-header>a:last-child{
  padding:10px 13px;
  border:1px solid rgba(10,18,30,.08);
  border-radius:999px;
  background:rgba(255,255,255,.62);
  color:var(--text);
}
.site-header>span{display:none}

.progress{
  position:fixed;
  z-index:41;
  left:50%;
  top:29px;
  width:clamp(340px,46vw,620px);
  height:32px;
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:3px;
  padding:3px;
  border:1px solid rgba(10,18,30,.06);
  border-radius:999px;
  background:rgba(242,244,247,.66);
  backdrop-filter:blur(18px) saturate(1.06);
  -webkit-backdrop-filter:blur(18px) saturate(1.06);
  transform:translateX(-50%);
}
.progress a{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:0 10px;
  border-top:0;
  border-radius:999px;
  min-width:0;
  color:#747b86;
  font:650 10px/1 var(--mono);
  letter-spacing:.015em;
  transition:background .3s ease,color .3s ease;
}
.progress a:before{
  content:none;
}
.progress a.active{
  color:#fff;
  background:var(--heading);
}
.progress a.done{color:#3f4650}
.progress i{margin-right:7px;color:inherit;font-style:normal}
.progress span{
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

main{padding-top:118px}
.reading{
  min-height:calc(100dvh - 118px);
  scroll-margin-top:118px;
  padding:42px 4vw 42px;
  display:grid;
  grid-template-columns:minmax(640px,1.18fr) minmax(360px,.82fr);
  gap:clamp(44px,6vw,96px);
  align-items:center;
  position:relative;
  overflow:hidden;
}
.reading:after{
  content:"";
  position:absolute;
  inset:auto 4vw 0;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--line),transparent);
}
.visual{
  position:relative;
  aspect-ratio:1672/941;
  overflow:hidden;
  background:var(--paper);
}
.visual.hero{
  border:1px solid var(--line);
  border-radius:14px;
  box-shadow:0 18px 50px rgba(17,24,39,.06),0 1px 0 rgba(255,255,255,.9) inset;
}
.visual.paper{
  border:0;
  border-radius:0;
  box-shadow:none;
}
.visual img{
  width:100%;
  height:100%;
  display:block;
  object-fit:cover;
}
.visual.paper img{object-fit:contain}

.reading article{max-width:520px}
.kicker{
  margin-bottom:18px;
  color:#59616c;
  font:700 10px/1 var(--mono);
  letter-spacing:.08em;
  text-transform:uppercase;
}
.reading h1,.reading h2{
  margin:0 0 24px;
  color:var(--heading);
  font-family:"SF Pro Display","PingFang SC",var(--sans);
  font-size:clamp(38px,3.34vw,56px);
  line-height:1.06;
  letter-spacing:0;
  font-weight:700;
}
.reading p{
  color:var(--muted);
  font-size:15px;
  line-height:1.82;
  letter-spacing:0;
}
.reading .lead{
  margin-bottom:18px;
  padding-bottom:20px;
  border-bottom:1px solid var(--line);
  color:#24272d;
  font-size:16px;
  line-height:1.74;
  font-weight:560;
}
.meta{
  margin-top:26px;
  border-top:1px solid var(--heading);
}
.meta div{
  display:grid;
  grid-template-columns:78px 1fr;
  padding:13px 0;
  border-bottom:1px solid var(--line);
  font-size:12px;
  line-height:1.55;
}
.meta dt{
  color:#6b7280;
  font-family:var(--mono);
  font-weight:650;
}
.meta dd{margin:0;color:#24272d}

.evidence{
  margin:24px 0 0;
  padding:0;
  list-style:none;
  border-top:1px solid var(--heading);
}
.evidence li{
  display:grid;
  grid-template-columns:76px 1fr;
  gap:12px;
  padding:14px 0;
  border-bottom:1px solid var(--line);
  color:#363a42;
  font-size:13px;
  line-height:1.62;
}
.evidence span{
  display:block;
  color:#6b7280;
  font:700 10px/1.62 var(--mono);
  letter-spacing:.03em;
  text-transform:uppercase;
}
.story-block{
  display:grid;
  grid-template-columns:96px 1fr;
  gap:18px;
  padding:17px 0;
  border-top:1px solid var(--line);
}
.story-block:first-of-type{border-top:1px solid var(--heading)}
.story-block span{
  padding-top:6px;
  color:#57606b;
  font:750 10px/1 var(--mono);
  letter-spacing:.035em;
  text-transform:uppercase;
}
.block-copy{min-width:0}
.block-copy strong{
  display:block;
  margin-bottom:6px;
  color:#1f2329;
  font-size:15px;
  line-height:1.58;
  font-weight:680;
}
.story-block:first-of-type span,
.story-block:first-of-type strong{color:var(--accent)}
.story-block p{
  margin:0;
  color:#66707c;
  font-size:13px;
  line-height:1.72;
}
.doc-link{
  display:inline-flex;
  align-items:center;
  margin-top:26px;
  padding-bottom:8px;
  border-bottom:1px solid var(--heading);
  color:var(--heading);
  font:700 12px/1 var(--mono);
  letter-spacing:.01em;
}
.doc-link span{margin-left:24px;color:var(--heading)}

.gsap-ready .reading .visual,
.gsap-ready .reading article,
.gsap-ready .reading .meta div,
.gsap-ready .reading .evidence li,
.gsap-ready .reading .story-block,
.gsap-ready .reading .doc-link{opacity:0}

@media(max-width:1100px){
  .progress{
    width:300px;
  }
  .progress span{
    display:none;
  }
  .progress i{margin-right:0}
  .reading{
    grid-template-columns:minmax(0,1fr);
    gap:30px;
    padding-top:36px;
  }
  .reading article{max-width:680px}
}
@media(max-width:900px){
  .progress{display:none}
  .site-header>span{display:none}
  .site-header{
    top:14px;
    left:18px;
    right:18px;
    height:54px;
  }
  .site-header>a:last-child{padding:9px 12px}
  main{padding-top:82px}
  .reading{
    min-height:auto;
    display:block;
    padding:36px 18px 70px;
  }
  .visual{margin-bottom:30px}
  .visual.hero{border-radius:10px}
  .reading h1,.reading h2{font-size:38px}
  .story-block{grid-template-columns:92px 1fr}
}
@media(max-width:520px){
  .site-header{padding:0 18px}
  .reading h1,.reading h2{font-size:34px}
  .meta div,.evidence li,.story-block{grid-template-columns:1fr;gap:6px}
  .story-block span{padding-top:0}
  .block-copy strong{font-size:14px}
}
@media(prefers-reduced-motion:reduce){
  *,*:before,*:after{animation:none!important;transition:none!important}
  .gsap-ready .reading .visual,
  .gsap-ready .reading article,
  .gsap-ready .reading .meta div,
  .gsap-ready .reading .evidence li,
  .gsap-ready .reading .story-block,
  .gsap-ready .reading .doc-link{opacity:1}
}