:root{
  --paper:#fdfbf7;
  --paper-2:#f5f5f5;
  --paper-3:#ecebe5;
  --ink:#1a1a1a;
  --ink-2:#3c3c38;
  --ink-3:#6c6c66;
  --rule:#dedbd2;
  --rule-soft:#e7e4dc;
  --gut:clamp(18px,4vw,60px);
  --maxw:1200px;
  --navh:104px;
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Inter',"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:2;
  pointer-events:none;
  mix-blend-mode:multiply;
  opacity:.55;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='150' height='150'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='150' height='150' filter='url(%23n)' opacity='0.3'/%3E%3C/svg%3E");
}

img{display:block;max-width:100%}

h1,h2,h3,h4{
  font-family:'Space Grotesk','Inter',"PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.16;
  letter-spacing:-.012em;
  margin:0 0 .55em;
  font-weight:600;
}

p{margin:0 0 1em}
ul,ol{margin:0 0 1em}
a{color:inherit;text-decoration:none}

hr{
  border:0;
  border-top:2px solid var(--ink);
  width:76px;
  margin:.85rem 0 1.4rem;
}

:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:3px;
}

[id]{scroll-margin-top:calc(var(--navh) + 20px)}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}

.skip{
  position:absolute;
  left:14px;
  top:-70px;
  z-index:80;
  padding:12px 18px;
  background:var(--ink);
  color:var(--paper);
  border:1px solid var(--ink);
}
.skip:focus{top:12px}

.strap{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:6px 20px;
  padding:10px var(--gut);
  border-bottom:1px solid var(--rule-soft);
  font-size:16px;
  color:var(--ink-3);
  letter-spacing:.02em;
}
.strap p{margin:0}
.strap-b{font-family:'JetBrains Mono',monospace;letter-spacing:.04em}

.masthead{
  position:sticky;
  top:0;
  z-index:40;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 18px;
  padding:10px var(--gut);
  background:var(--paper);
  border-bottom:2px solid var(--ink);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:4px 2px;
}
.brand-logo{width:34px;height:34px;object-fit:contain;filter:grayscale(1) contrast(1.1)}
.brand-mark{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  border:2px solid var(--ink);
  font-family:'Space Grotesk',sans-serif;
  font-weight:700;
  font-size:18px;
  line-height:1;
}
.brand-name{
  font-family:'Space Grotesk',sans-serif;
  font-weight:700;
  font-size:19px;
  letter-spacing:.05em;
}

.anchors{
  flex:1 1 auto;
  min-width:0;
}
.anchor-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:0 2px;
  list-style:none;
  margin:0;
  padding:0;
}
.anchor-list a{
  display:flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:6px 11px;
  font-size:16px;
  border:1px solid transparent;
  transition:none;
}
.anchor-list a:hover,
.anchor-list a:focus-visible{
  border-color:var(--ink);
  background:var(--paper-2);
}
.num{
  font-family:'JetBrains Mono',monospace;
  font-size:14px;
  color:var(--ink-3);
  letter-spacing:.04em;
}
.anchor-list a:hover .num{color:var(--ink)}

.hero{
  position:relative;
  display:flex;
  flex-direction:column;
  min-height:100svh;
  padding:clamp(28px,6vw,84px) var(--gut) clamp(26px,5vw,64px);
  overflow:hidden;
  border-bottom:2px solid var(--ink);
}

.hero-fig{
  position:absolute;
  inset:0;
  margin:0;
  z-index:0;
  background:var(--paper-2);
}
.hero-fig::after{
  content:"";
  position:absolute;
  inset:0;
  background:rgba(253,251,247,.76);
}
.hero-img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(1) contrast(1.08);
}

.hero-copy{
  position:relative;
  z-index:1;
  margin-left:auto;
  max-width:44rem;
  text-align:right;
  padding-top:clamp(10px,4vh,52px);
}
.kicker{
  font-family:'JetBrains Mono',monospace;
  font-size:16px;
  letter-spacing:.2em;
  color:var(--ink-2);
  margin-bottom:16px;
}
.hero h1{
  font-size:clamp(2.05rem,7.4vw,4.5rem);
  line-height:1.04;
  letter-spacing:-.025em;
  font-weight:700;
  margin-bottom:.4em;
}
.hero-rule{
  margin-left:auto;
  margin-right:0;
  width:100px;
  border-top-width:3px;
}
.lede{
  font-size:clamp(1rem,1.7vw,1.15rem);
  line-height:1.7;
  color:var(--ink-2);
  max-width:34rem;
  margin-left:auto;
  margin-top:1.2rem;
}

.hero-cap{
  position:relative;
  z-index:1;
  margin:auto 0 0;
  padding-top:30px;
  max-width:32rem;
  font-size:16px;
  line-height:1.7;
  color:var(--ink-3);
}

.reading{
  display:grid;
  grid-template-columns:minmax(0,1fr) 322px;
  gap:clamp(24px,4vw,58px);
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(36px,6vw,84px) var(--gut);
}

.reading-head h2{
  font-size:clamp(1.5rem,3.4vw,2rem);
  margin-bottom:.2em;
}
.reading-note{
  font-size:16px;
  line-height:1.8;
  color:var(--ink-2);
  max-width:34rem;
}

.prose{
  font-family:Georgia,"Songti SC","Noto Serif SC",serif;
  font-size:17px;
  line-height:1.92;
  color:#232320;
  max-width:40rem;
}
.prose > section,
.prose section{
  padding:clamp(20px,3vw,34px) 0;
  border-top:1px solid var(--rule);
}
.prose section:first-child{
  border-top:0;
  padding-top:0;
}
.prose h2{
  font-size:clamp(1.45rem,3.2vw,1.95rem);
  margin-top:.2em;
}
.prose h3{font-size:1.14rem}
.prose ul,.prose ol{padding-left:1.25em}
.prose li{margin:.4em 0}
.prose a{border-bottom:1px solid var(--ink-3)}
.prose a:hover{border-bottom-color:var(--ink)}
.prose blockquote{
  margin:1.4em 0;
  padding:.3em 0 .3em 18px;
  border-left:3px solid var(--ink);
  color:var(--ink-2);
}
.prose table{
  width:100%;
  border-collapse:collapse;
  font-size:16px;
  font-family:'Inter',sans-serif;
  margin:1.2em 0;
}
.prose th,.prose td{
  border:1px solid var(--rule);
  padding:9px 11px;
  text-align:left;
  vertical-align:top;
}
.prose th{background:var(--paper-3);font-weight:600}
.prose img{margin:1.2em 0;border:1px solid var(--rule)}
.prose code,.prose pre{
  font-family:'JetBrains Mono',monospace;
  font-size:15px;
}
.prose pre{
  background:var(--paper-2);
  border:1px solid var(--rule);
  padding:14px;
  overflow-x:auto;
}

.rail{
  display:flex;
  flex-direction:column;
  gap:20px;
  align-self:start;
  position:sticky;
  top:calc(var(--navh) + 20px);
}

.card{
  border:1px solid #d8d5cd;
  background:rgba(245,245,245,.72);
  -webkit-backdrop-filter:blur(7px);
  backdrop-filter:blur(7px);
  box-shadow:5px 5px 0 rgba(26,26,26,.055);
  padding:20px 20px 10px;
}
.card h2,.card h3{
  font-size:1.02rem;
  letter-spacing:.02em;
  margin-bottom:.35em;
}
.card hr{width:44px;margin-bottom:1rem}
.card p{
  font-size:16px;
  line-height:1.8;
  color:var(--ink-2);
}

.rail-list{
  list-style:none;
  counter-reset:rail;
  margin:0 0 10px;
  padding:0;
}
.rail-list li{
  counter-increment:rail;
  border-top:1px solid var(--rule-soft);
}
.rail-list li:first-child{border-top:0}
.rail-list a{
  display:flex;
  gap:10px;
  align-items:baseline;
  min-height:44px;
  padding:9px 0;
  font-size:16px;
  line-height:1.5;
}
.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  font-family:'JetBrains Mono',monospace;
  font-size:14px;
  color:var(--ink-3);
}
.rail-list a:hover{text-decoration:underline;text-underline-offset:3px}

.colophon{
  margin-top:clamp(36px,7vw,80px);
  padding:clamp(32px,5vw,60px) var(--gut) 22px;
  background:var(--paper-2);
  border-top:2px solid var(--ink);
}

.foot-lead,
.foot-dls,
.foot-bottom{
  max-width:var(--maxw);
  margin-left:auto;
  margin-right:auto;
}

.foot-lead{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);
  gap:22px 40px;
  align-items:end;
  padding-bottom:32px;
}
.foot-title{font-size:clamp(1.2rem,2.6vw,1.55rem)}
.foot-sub{
  font-size:16px;
  line-height:1.8;
  color:var(--ink-2);
  max-width:32rem;
}
.sub-form label{
  display:block;
  font-size:16px;
  color:var(--ink-2);
  margin-bottom:9px;
}
.sub-row{display:flex;gap:10px;flex-wrap:wrap}
.sub-row input{
  flex:1 1 180px;
  min-height:46px;
  padding:10px 12px;
  font:inherit;
  font-size:16px;
  color:var(--ink);
  background:var(--paper);
  border:1px solid var(--ink);
}
.sub-row button{
  min-height:46px;
  padding:0 22px;
  font:inherit;
  font-size:16px;
  cursor:pointer;
  color:var(--paper);
  background:var(--ink);
  border:1px solid var(--ink);
  letter-spacing:.06em;
}
.sub-row button:hover{background:var(--ink-2)}

.foot-dls{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
  padding:28px 0;
  border-top:1px solid #d5d2ca;
}
.foot-dls dt{
  font-family:'Space Grotesk',sans-serif;
  font-size:16px;
  letter-spacing:.16em;
  padding-bottom:8px;
  margin-bottom:10px;
  border-bottom:2px solid var(--ink);
}
.foot-dls dd{
  margin:0 0 7px;
  font-size:16px;
  line-height:1.7;
  color:var(--ink-2);
}

.foot-bottom{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:10px 24px;
  padding-top:16px;
  border-top:1px solid #d5d2ca;
  font-size:16px;
  color:var(--ink-2);
}
.copyright{margin:0}
.foot-links{
  display:flex;
  flex-wrap:wrap;
  gap:18px;
  list-style:none;
  margin:0;
  padding:0;
}
.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  border-bottom:1px solid var(--ink-3);
}
.foot-links a:hover{border-bottom-color:var(--ink)}

@media (prefers-reduced-motion:no-preference){
  .anchor-list li,
  .rail-list li{
    opacity:0;
    transform:translateY(7px);
    animation:rise .16s steps(2,end) forwards;
  }
  .anchor-list li:nth-child(1),.rail-list li:nth-child(1){animation-delay:20ms}
  .anchor-list li:nth-child(2),.rail-list li:nth-child(2){animation-delay:45ms}
  .anchor-list li:nth-child(3),.rail-list li:nth-child(3){animation-delay:70ms}
  .anchor-list li:nth-child(4),.rail-list li:nth-child(4){animation-delay:95ms}
  .anchor-list li:nth-child(5),.rail-list li:nth-child(5){animation-delay:120ms}
  .anchor-list li:nth-child(6),.rail-list li:nth-child(6){animation-delay:145ms}
  .anchor-list li:nth-child(7),.rail-list li:nth-child(7){animation-delay:170ms}
  @keyframes rise{to{opacity:1;transform:none}}
}

@media (max-width:1000px){
  .reading{grid-template-columns:minmax(0,1fr)}
  .rail{
    position:static;
    flex-direction:row;
    flex-wrap:wrap;
    margin-top:8px;
    padding-top:24px;
    border-top:2px solid var(--ink);
  }
  .rail-card{flex:1 1 260px}
  .prose{max-width:100%}
}

@media (max-width:860px){
  .foot-lead{grid-template-columns:minmax(0,1fr);align-items:start}
}

@media (max-width:760px){
  :root{--navh:150px}
  .masthead{padding:8px var(--gut) 6px}
  .anchors{width:100%;margin:0 calc(var(--gut) * -1);padding:0 var(--gut)}
  .anchor-list{
    flex-wrap:nowrap;
    justify-content:flex-start;
    overflow-x:auto;
    padding-bottom:4px;
    scrollbar-width:thin;
  }
  .anchor-list li{flex:0 0 auto}
  .anchor-list a{padding:6px 10px;white-space:nowrap}
  .hero{padding-top:clamp(22px,7vw,44px)}
  .hero-copy{max-width:100%}
  .hero-cap{max-width:100%;font-size:16px}
  .foot-dls{grid-template-columns:minmax(0,1fr);gap:18px}
  .foot-bottom{justify-content:flex-start}
}

@media (max-width:420px){
  body{font-size:17px}
  .strap{justify-content:flex-start}
  .hero h1{font-size:clamp(1.9rem,9vw,2.8rem)}
  .lede{font-size:16px}
}

@media print{
  body::before{display:none}
  .masthead,.rail,.sub-form{display:none}
  .reading{display:block}
}

button[aria-expanded]{min-width:44px;min-height:44px}