@font-face{
  font-family:"Archivo";
  font-style:normal;
  font-weight:400 900;
  font-stretch:75% 100%;
  font-display:swap;
  src:url("../fonts/archivo-variable-latin.woff2") format("woff2");
}
@font-face{
  font-family:"Space Mono";
  font-style:normal;
  font-weight:400;
  font-display:swap;
  src:url("../fonts/space-mono-400-latin.woff2") format("woff2");
}
@font-face{
  font-family:"Space Mono";
  font-style:normal;
  font-weight:700;
  font-display:swap;
  src:url("../fonts/space-mono-700-latin.woff2") format("woff2");
}

:root{
  --coal:#16181a;
  --anthracite:#23282c;
  --anthracite-2:#2c3338;
  --edge:#373f45;
  /* Interactive-control borders need 3:1 against coal for WCAG 1.4.11; --edge
     is 1.66:1 and stays the hairline for dividers and shelf edges only. */
  --edge-strong:#5d676f;
  --ash:#93999d;
  --smoke:#cbd0d4;
  --white:#f4f6f7;
  --seam:#8844a8;
  --seam-glow:#b27fe0;
  --seam-wash:rgba(178,127,224,.16);

  --r-sm:6px;
  --r-md:14px;

  --sans:"Archivo",system-ui,sans-serif;
  --mono:"Space Mono",ui-monospace,monospace;

  --gut:clamp(1.25rem,5vw,4.5rem);
  --maxw:1180px;

  --sp-1:.25rem;
  --sp-2:.5rem;
  --sp-3:.75rem;
  --sp-4:1rem;
  --sp-5:1.5rem;
  --sp-6:2rem;
  --sp-7:3rem;
  --sp-8:5rem;

  --ease:cubic-bezier(0,0,.2,1);

  --shadow-lift:0 1px 2px rgba(0,0,0,.35),0 12px 28px -8px rgba(0,0,0,.5);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(ellipse 1100px 560px at 50% -8%, rgba(178,127,224,.07), transparent 62%),
    radial-gradient(circle at 1px 1px, rgba(244,246,247,.04) 1px, transparent 0) 0 0/26px 26px,
    var(--coal);
  color:var(--smoke);
  font-family:var(--sans);
  font-size:clamp(1rem,.96rem + .15vw,1.05rem);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit}
svg{display:block}
h1,h2,h3{font-family:var(--sans);color:var(--white);margin:0}
p{margin:0}

/* No border-radius: outlines follow the element's own corner, and the blanket
   2px only ever rounded elements that had no business being rounded. */
:focus-visible{
  outline:2px solid var(--seam-glow);
  outline-offset:3px;
}

.skip-link{
  position:absolute;
  left:var(--sp-4);
  top:-3rem;
  z-index:200;
  background:var(--white);
  color:var(--coal);
  font-weight:700;
  font-size:.85rem;
  padding:.6rem 1rem;
  border-radius:var(--r-sm);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:var(--sp-4)}

.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}

.section-in{
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gut);
}

/* ---------- Nav ---------- */
.nav{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(22,24,26,.78);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--edge);
}
.nav-in{
  max-width:var(--maxw);
  margin-inline:auto;
  padding:.85rem var(--gut);
  display:flex;
  align-items:center;
  gap:var(--sp-6);
}
.brand{display:block;line-height:0;flex:none;border-radius:var(--r-sm)}
.brand .mark{height:18px;width:auto;transition:opacity .18s var(--ease)}
.brand:hover .mark{opacity:.75}
.nav-cta{
  margin-left:auto;
  font-size:.88rem;
  font-weight:600;
  text-decoration:none;
  color:var(--white);
  background:var(--anthracite-2);
  border:1px solid var(--edge-strong);
  border-radius:var(--r-sm);
  padding:.5rem 1rem;
  transition:background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-cta:hover{border-color:var(--seam-glow)}

/* ---------- Hero ---------- */
.hero{padding-block:clamp(3.5rem,9vw,6rem) clamp(2rem,5vw,3rem)}
/* Matches the main site's Display role after it stepped down from 800/5.25rem:
   the system has one display setting, and the archives shell shares it. */
.hero h1{
  font-weight:700;
  font-size:clamp(2rem,3.6vw,3rem);
  line-height:1.1;
  letter-spacing:-.02em;
  text-wrap:balance;
  margin:0 0 var(--sp-5);
}
.lede{
  max-width:66ch;
  font-size:clamp(1.05rem,1.5vw,1.2rem);
  color:var(--smoke);
  margin:0;
}
.lede strong{color:var(--white);font-weight:600}

/* ---------- Shelf ---------- */
.shelf-sec{padding-block:clamp(1.5rem,4vw,2.5rem) clamp(3rem,7vw,5rem)}
.shelf{
  list-style:none;
  margin:0;padding:0;
  border:1px solid var(--edge);
  border-radius:var(--r-md);
  overflow:hidden;
}
.box{border-top:1px solid var(--edge)}
.box:first-child{border-top:0}

.box-label{
  width:100%;
  display:grid;
  grid-template-columns:1fr auto auto;
  align-items:center;
  gap:var(--sp-4);
  padding:1.05rem clamp(1rem,2.5vw,1.5rem);
  background:transparent;
  border:0;
  text-align:left;
  cursor:pointer;
  color:inherit;
  font-family:var(--sans);
  transition:background-color .2s var(--ease);
}
.box-label:hover{background:var(--anthracite)}
.box-name{
  font-size:clamp(1.05rem,2vw,1.3rem);
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--white);
}
.box-tags{
  display:grid;
  grid-template-columns:auto 10ch;
  align-items:center;
  gap:var(--sp-4);
  font-family:var(--mono);
  font-size:.8rem;
}
.box-year{color:var(--smoke);font-weight:700;text-align:right}
.box-lang{color:var(--ash);text-align:left}
.box-chevron{
  width:16px;height:16px;
  color:var(--ash);
  transition:transform .25s var(--ease),color .2s var(--ease);
}
.box-label:hover .box-chevron{color:var(--seam-glow)}
.box-label[aria-expanded="true"] .box-chevron{transform:rotate(-180deg);color:var(--seam-glow)}

/* the pull-forward: opened box lifts off the flat shelf */
.box.is-open{
  position:relative;
  z-index:1;
  border-radius:var(--r-md);
  background:var(--anthracite);
  box-shadow:var(--shadow-lift);
}
.box.is-open + .box{border-top-color:transparent}
.box.is-open .box-label:hover{background:transparent}
.box.is-open .box-name{color:var(--white)}

.box-panel{
  display:grid;
  grid-template-rows:0fr;
  visibility:hidden;
  transition:grid-template-rows .28s var(--ease),visibility .28s var(--ease);
}
.box.is-open .box-panel{grid-template-rows:1fr;visibility:visible}
.box-panel-in{
  overflow:hidden;
  min-height:0;
}
.box-panel-in > p{
  margin:0 clamp(1rem,2.5vw,1.5rem);
  padding-bottom:var(--sp-4);
  max-width:70ch;
  color:var(--smoke);
}
.box-panel-in em{color:var(--white);font-style:italic}

.box-foot{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:var(--sp-4);
  flex-wrap:wrap;
  margin:0 clamp(1rem,2.5vw,1.5rem);
  padding:var(--sp-3) 0 1.1rem;
  border-top:1px solid var(--edge);
}
.box-license{
  font-family:var(--mono);
  font-size:.76rem;
  color:var(--ash);
}
.box-license--note{font-family:var(--sans);font-style:italic;color:var(--ash)}
.box-link{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  font-size:.86rem;
  font-weight:600;
  color:var(--seam-glow);
  text-decoration:none;
  transition:gap .18s var(--ease);
}
.box-link .i-arrow{width:14px;height:14px;transition:transform .18s var(--ease)}
.box-link:hover .i-arrow{transform:translateX(3px)}

/* ---------- Why ---------- */
.why{padding-block:clamp(3rem,7vw,5rem) 0;border-top:1px solid var(--edge)}
.why h2{
  font-size:clamp(1.6rem,3vw,2.1rem);
  font-weight:700;
  letter-spacing:-.015em;
  margin-bottom:var(--sp-5);
}
.why-copy{
  max-width:62ch;
  color:var(--smoke);
  margin-bottom:var(--sp-6);
}

.cta-row{display:flex;gap:.75rem;flex-wrap:wrap}
.btn{
  font-family:var(--sans);
  font-size:.92rem;
  font-weight:600;
  text-decoration:none;
  padding:.7rem 1.25rem;
  border:1px solid var(--edge-strong);
  border-radius:var(--r-sm);
  color:var(--smoke);
  background:transparent;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
/* seam on the hovered fill is 2.10:1 and fails 1.4.11 for a state change.
   seam-glow is 4.28:1. Same defect already fixed on the main site. */
.btn:hover{border-color:var(--seam-glow);background:var(--anthracite-2);color:var(--white)}
.btn:active{transform:translateY(1px)}
.btn-ghost{border-color:var(--seam-glow);color:var(--seam-glow)}
/* A tint, not a solid fill: the solid version is the primary button's resting
   state on the main site, and the ghost must not impersonate it. */
.btn-ghost:hover{background:var(--seam-wash);border-color:var(--seam-glow);color:var(--white)}
.btn-ghost:focus-visible{outline-color:var(--white)}

/* The rule belongs to the footer, not to its inner column. On .foot-in it
   inherited the gutter and stopped short of the viewport edge, which the main
   site already fixed; this keeps the two pages consistent. */
.foot{margin-top:var(--sp-8);border-top:1px solid var(--edge)}
.foot-in{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:var(--sp-5);
  flex-wrap:wrap;
  padding-block:var(--sp-5);
  font-size:.85rem;
  color:var(--ash);
}

/* ---------- Motion ---------- */
.hero h1,.hero .lede{
  animation:rise .45s var(--ease) both;
}
.hero .lede{animation-delay:.06s}
@keyframes rise{from{transform:translateY(8px)}to{transform:none}}

@media (max-width:640px){
  .nav-in{padding-inline:var(--sp-3)}
  .box-label{grid-template-columns:1fr auto;row-gap:var(--sp-2)}
  /* full-width tags row tucked left under the name (desktop's auto/10ch grid
     right-packs them, leaving an orphaned gutter on narrow screens) */
  .box-tags{grid-column:1/-1;order:3;display:flex;justify-content:flex-start;gap:var(--sp-3)}
  .box-year{text-align:left}
  .box-chevron{grid-column:2;grid-row:1}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none !important;transition:none !important}
  .box-panel{transition:none}
}