@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#000000;
  --paper:#ffffff;
  --mute:#3c3c3c;
  --u:8px;
  --edge:clamp(16px,4vw,56px);
  --font:'Plus Jakarta Sans','Helvetica Neue',Helvetica,Arial,sans-serif;
}

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

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font);
  font-size:17px;
  line-height:1.65;
  font-weight:400;
  overflow-x:hidden;
}

a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure{margin:0}
button{font:inherit}

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

/* header block */
.masthead{
  position:sticky;
  top:0;
  z-index:60;
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:var(--u);
  align-items:center;
  padding:calc(var(--u)*1.5) var(--edge);
  background:var(--paper);
  border-bottom:2px solid var(--ink);
}

.mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  padding:4px;
  border-radius:4px;
  background:var(--ink);
  color:var(--paper);
  font-size:11px;
  line-height:1.05;
  font-weight:700;
  letter-spacing:.05em;
  text-align:center;
}

.nav{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:var(--u);
  min-width:0;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:6px;
  min-width:0;
  padding:2px;
  overflow-x:auto;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}
.nav-list::-webkit-scrollbar{display:none}

.nav-link{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:6px 14px;
  border:1px solid var(--ink);
  border-radius:999px;
  font-size:16px;
  font-weight:500;
  white-space:nowrap;
  transition:background .18s ease,color .18s ease;
}
.nav-link:hover,.nav-link:focus-visible,.nav-link.is-active{background:var(--ink);color:var(--paper)}

.nav-cta{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:6px 18px;
  border-radius:999px;
  background:var(--ink);
  color:var(--paper);
  font-size:16px;
  font-weight:600;
  white-space:nowrap;
  box-shadow:inset 0 0 0 2px var(--ink);
  transition:background .18s ease,color .18s ease;
}
.nav-cta:hover,.nav-cta:focus-visible{background:var(--paper);color:var(--ink)}

/* hero */
.hero{
  position:relative;
  display:grid;
  min-height:70vh;
  padding:calc(var(--u)*9) var(--edge) calc(var(--u)*4);
  border-bottom:2px solid var(--ink);
}

.hero-plate{
  position:relative;
  display:grid;
  align-content:end;
  gap:calc(var(--u)*2);
}

.hero-dots{
  position:absolute;
  inset:-8px 0 0 0;
  background-image:radial-gradient(var(--ink) 1px,transparent 1.4px);
  background-size:18px 18px;
  opacity:.55;
  -webkit-mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.35) 55%,rgba(0,0,0,0) 86%);
  mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.35) 55%,rgba(0,0,0,0) 86%);
}

.hero-h1{
  position:relative;
  text-align:right;
  font-size:clamp(2.4rem,8.6vw,7rem);
  line-height:.94;
  letter-spacing:-.035em;
  font-weight:700;
  text-wrap:balance;
}

/* content grid */
.split{
  display:grid;
  grid-template-columns:minmax(0,1fr) 264px;
  gap:calc(var(--u)*6) calc(var(--u)*5);
  max-width:1240px;
  margin:0 auto;
  padding:calc(var(--u)*5) var(--edge) calc(var(--u)*9);
}

.doc{min-width:0}

.doc > article{
  scroll-margin-top:96px;
  margin-top:calc(var(--u)*5);
  padding-top:calc(var(--u)*4);
  border-top:2px solid var(--ink);
}
.doc > article:first-child{margin-top:0;padding-top:0;border-top:0}

.doc h2{
  margin-bottom:calc(var(--u)*2);
  font-size:clamp(1.6rem,3.6vw,2.5rem);
  line-height:1.1;
  letter-spacing:-.025em;
  font-weight:700;
}
.doc h3{
  margin:calc(var(--u)*3) 0 var(--u);
  font-size:clamp(1.25rem,2.4vw,1.6rem);
  line-height:1.25;
  letter-spacing:-.015em;
  font-weight:600;
}

.doc p{margin-bottom:calc(var(--u)*2);max-width:66ch}

.doc ul,.doc ol{
  display:grid;
  gap:var(--u);
  margin:0 0 calc(var(--u)*2.5);
}
.doc li{position:relative;padding-left:calc(var(--u)*2.5);max-width:66ch}
.doc ul li::before{
  content:'';
  position:absolute;
  left:0;
  top:.72em;
  width:8px;
  height:8px;
  background:var(--ink);
}
.doc ol{counter-reset:d}
.doc ol li{counter-increment:d}
.doc ol li::before{
  content:counter(d,decimal-leading-zero);
  position:absolute;
  left:0;
  top:.1em;
  font-size:14px;
  font-weight:700;
  letter-spacing:.05em;
}

.doc blockquote{
  margin:0 0 calc(var(--u)*2.5);
  padding:calc(var(--u)*2) 0 calc(var(--u)*2) calc(var(--u)*2.5);
  border-left:4px solid var(--ink);
  font-size:1.04em;
}
.doc blockquote p:last-child{margin-bottom:0}

.doc a{
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
.doc a:hover{background:var(--ink);color:var(--paper);text-decoration:none}

.doc strong{font-weight:700}
.doc figure{margin:0 0 calc(var(--u)*2.5)}
.doc figcaption{margin-top:var(--u);font-size:16px;color:var(--mute)}
.doc img{border-radius:4px;width:100%}
.doc hr{margin:calc(var(--u)*3) 0;border:0;border-top:1px solid var(--ink)}

/* side rail */
.rail{
  order:2;
  align-self:start;
  position:sticky;
  top:100px;
  padding:0 0 var(--u) calc(var(--u)*2.5);
  border-left:2px solid var(--ink);
}

.rail-eyebrow{
  display:block;
  font-size:16px;
  font-weight:600;
  letter-spacing:.2em;
}

.rail-title{
  margin:calc(var(--u)*.5) 0 calc(var(--u)*1.5);
  font-size:1.35rem;
  line-height:1.2;
  letter-spacing:-.02em;
  font-weight:700;
}

.rail-list{counter-reset:r;border-top:1px solid var(--ink)}
.rail-list li{counter-increment:r;border-bottom:1px solid rgba(0,0,0,.22)}
.rail-list a{
  display:flex;
  align-items:center;
  gap:calc(var(--u)*1.25);
  min-height:44px;
  padding-right:4px;
  font-size:16px;
  font-weight:500;
}
.rail-list a::before{
  content:counter(r,decimal-leading-zero);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
}
.rail-list a:hover{background:var(--ink);color:var(--paper)}

/* footer */
.foot{
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr 1.3fr;
  gap:calc(var(--u)*4) calc(var(--u)*3);
  padding:calc(var(--u)*6) var(--edge) calc(var(--u)*4);
  border-top:2px solid var(--ink);
}

.foot-mark{
  display:inline-block;
  padding:6px 0;
  font-size:1.35rem;
  font-weight:700;
  letter-spacing:-.02em;
}
.foot-mark:hover{background:var(--ink);color:var(--paper)}

.foot-col ul{display:grid;gap:2px}
.foot-col a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:16px;
}
.foot-col a:hover{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:4px}

.foot-end{
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  justify-content:space-between;
  gap:var(--u);
  text-align:right;
}

.copy{font-size:16px;letter-spacing:.02em}

.foot-top{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:6px 16px;
  border:1px solid var(--ink);
  border-radius:999px;
  font-size:16px;
  font-weight:600;
}
.foot-top:hover{background:var(--ink);color:var(--paper)}

/* motion */
.js .reveal{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .55s ease,transform .6s cubic-bezier(.22,.7,.24,1);
}
.js .reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;transform:none;transition:none}
  .nav-link,.nav-cta{transition:none}
}

@media (max-width:980px){
  .split{grid-template-columns:minmax(0,1fr);gap:calc(var(--u)*4)}
  .rail{
    order:-1;
    position:static;
    padding:calc(var(--u)*2) 0 0;
    border-left:0;
    border-top:2px solid var(--ink);
  }
  .foot{grid-template-columns:1fr 1fr}
  .foot-end{
    grid-column:1/-1;
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    text-align:left;
  }
}

@media (max-width:660px){
  .nav-cta{display:none}
  .hero{min-height:62vh;padding-top:calc(var(--u)*7)}
  .doc p,.doc li{max-width:none}
  .foot{grid-template-columns:1fr}
  .foot-col ul{grid-template-columns:1fr 1fr}
  .foot-end{grid-column:auto}
}

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