:root{
  --paper:#F5F3EF;
  --paper-raised:#FFFFFF;
  --panel-soft:#F8FBFF;
  --ink:#1A1A2A;
  --slate:#4A4A5A;
  --muted:#736E66;
  --rule:#E0DBD3;
  --criterion:#4A7CB5;
  --criterion-deep:#2F5F93;
  --criterion-soft:#D6E6F5;
  --criterion-dark:#1B3F72;
  --shadow:#D7D0C7;
  --max-w:1120px;
  --font-display:"Atkinson Hyperlegible","Segoe UI",Tahoma,Geneva,Verdana,sans-serif;
  --font-body:"Atkinson Hyperlegible","Segoe UI",Tahoma,Geneva,Verdana,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:18px;
  /* Typography scale (per the design-tokens standard). --font-size-xs is the
     readability floor: nothing renders smaller. px font sizes are not used —
     they ignore the reader's browser font-size preference. Display/heading
     sizes above 1rem are one-off rem literals by nature. */
  --font-size-xs:0.85rem;   /* 13.6px — floor: eyebrows, tags, captions, fine print */
  --font-size-sm:0.9rem;    /* 14.4px — secondary text, meta lines, small labels */
  --font-size-md:0.95rem;   /* 15.2px — compact body, control labels */
  --font-size-base:1rem;    /* 16px  — default body and reading size */
  --elevation:0 2px 4px color-mix(in srgb,var(--shadow) 10%,transparent),0 8px 22px color-mix(in srgb,var(--shadow) 12%,transparent);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}
body{
  background:
    radial-gradient(circle at top left,color-mix(in srgb,var(--criterion) 16%,transparent),transparent 32%),
    radial-gradient(circle at bottom right,color-mix(in srgb,var(--criterion) 12%,transparent),transparent 36%),
    linear-gradient(180deg,var(--paper) 0%,color-mix(in srgb,var(--paper) 78%,var(--paper-raised) 22%) 100%);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:var(--font-size-base);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit}
.wrap{max-width:var(--max-w);margin:0 auto;padding:0 24px}
:focus-visible{outline:2px solid var(--criterion);outline-offset:3px;border-radius:var(--radius-sm)}

/* ---------- header ---------- */
header.site{
  border-bottom:1px solid var(--rule);
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(14px);
  position:sticky;top:0;z-index:50;
}
header.site .wrap{
  display:flex;align-items:center;gap:32px;
  padding-top:14px;padding-bottom:14px;
}
nav.primary{align-items:center}
.wordmark{display:inline-block;text-decoration:none}
.logo{display:block;height:48px;width:auto}
.logo-footer{height:36px}
nav.primary{margin-left:auto;display:flex;gap:26px;align-items:baseline}
nav.primary a{font-size:var(--font-size-sm);text-decoration:none;color:var(--slate)}
nav.primary a:hover{color:var(--ink)}
nav.primary a.cta{
  color:#fff;background:var(--criterion-dark);
  padding:8px 16px;border-radius:var(--radius-sm);font-weight:700;
}
nav.primary a.cta:hover{background:var(--criterion-deep);color:#fff}
.menu-toggle{display:none}

/* ---------- hero ---------- */
.hero{padding:88px 0 72px;border-bottom:1px solid var(--rule)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center}
.eyebrow{
  font-family:var(--font-mono);font-size:var(--font-size-xs);letter-spacing:.16em;
  text-transform:uppercase;color:var(--criterion-deep);margin-bottom:20px;
}
h1{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(34px,4.6vw,52px);line-height:1.12;letter-spacing:0;
  margin-bottom:24px;
}
h1 em{font-style:italic;font-weight:700}
.hero p.lede{font-size:1.125rem;color:var(--slate);max-width:52ch;margin-bottom:34px}
.hero p.lede strong{color:var(--ink);font-weight:600}
.btn-row{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-block;text-decoration:none;font-weight:700;font-size:var(--font-size-md);
  padding:12px 22px;border-radius:var(--radius-sm);border:1px solid var(--rule);
  transition:background-color 120ms cubic-bezier(.2,0,0,1),border-color 120ms cubic-bezier(.2,0,0,1),color 120ms cubic-bezier(.2,0,0,1),transform 120ms cubic-bezier(.2,0,0,1);
}
.btn.solid{background:var(--criterion-dark);color:#fff;border-color:transparent}
.btn.solid:hover{background:var(--criterion-deep)}
.btn.ghost{color:var(--criterion-dark);background:#fff}
.btn.ghost:hover{background:var(--criterion-soft);border-color:var(--criterion)}
.btn:active{transform:translateY(1px)}

/* criterion diagram */
.diagram{
  background:var(--paper-raised);border:1px solid var(--rule);border-radius:var(--radius-lg);
  padding:20px 20px 12px;
  box-shadow:var(--elevation);
}
.diagram figcaption{
  font-family:var(--font-mono);font-size:var(--font-size-xs);color:var(--slate);
  padding:10px 4px 6px;border-top:1px solid var(--rule);margin-top:8px;
}
.dot{transform:translateY(40px);opacity:0;animation:settle .7s ease-out forwards}
@keyframes settle{to{transform:translateY(0);opacity:1}}

/* ---------- sections ---------- */
section{padding:80px 0;border-bottom:1px solid var(--rule)}
.sec-head{display:flex;align-items:baseline;gap:18px;margin-bottom:14px}
h2{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(26px,3vw,34px);line-height:1.2;
}
.sec-intro{color:var(--slate);max-width:64ch;margin-bottom:44px;font-size:1.03rem}

/* principles */
.principles{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--elevation)}
.principle{background:var(--paper-raised);padding:30px 28px}
.principle h3{font-family:var(--font-display);font-size:1.25rem;font-weight:700;margin-bottom:10px}
.principle p{font-size:var(--font-size-md);color:var(--slate)}
.principle .tag{
  font-family:var(--font-mono);font-size:var(--font-size-xs);letter-spacing:.12em;
  text-transform:uppercase;color:var(--criterion-deep);display:block;margin-bottom:14px;
}

/* roles */
.roles{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.role{border-top:3px solid var(--ink);padding-top:18px}
.role h3{font-family:var(--font-display);font-size:1.1875rem;font-weight:700;margin-bottom:8px}
.role p{font-size:var(--font-size-sm);color:var(--slate)}
.role.candidate{border-top-color:var(--criterion)}
.role .host{
  font-family:var(--font-mono);font-size:var(--font-size-xs);color:var(--slate);
  display:block;margin-top:12px;
}
.role .host a{text-decoration:none;border-bottom:1px solid var(--rule)}
.role .host a:hover{border-bottom-color:var(--criterion);color:var(--ink)}

/* lifecycle */
.lifecycle{display:flex;align-items:stretch;gap:0;margin-bottom:28px;flex-wrap:wrap}
.state{
  flex:1;min-width:170px;background:var(--paper-raised);
  border:1px solid var(--rule);padding:22px 20px;position:relative;
}
.state + .state{margin-left:-1px}
.state h3{font-family:var(--font-mono);font-size:var(--font-size-sm);font-weight:500;letter-spacing:.04em;margin-bottom:8px}
.state p{font-size:var(--font-size-sm);color:var(--slate)}
.state .n{
  font-family:var(--font-mono);font-size:var(--font-size-xs);color:var(--criterion-deep);
  display:block;margin-bottom:10px;letter-spacing:.1em;
}
.state.published{border-top:3px solid var(--criterion)}
.lifecycle-note{font-size:var(--font-size-md);color:var(--slate);max-width:66ch}

/* rigour */
.rigour{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.rigour-item{margin-bottom:30px}
.rigour-item h3{font-family:var(--font-display);font-size:1.25rem;font-weight:700;margin-bottom:8px}
.rigour-item p{font-size:var(--font-size-md);color:var(--slate)}
.pullquote{
  background:var(--paper-raised);border-left:3px solid var(--criterion);
  padding:26px 28px;font-family:var(--font-display);font-size:1.1875rem;
  font-style:italic;line-height:1.5;border-radius:var(--radius-md);
  box-shadow:var(--elevation);
}
.pullquote .attr{
  display:block;font-family:var(--font-mono);font-style:normal;
  font-size:var(--font-size-xs);color:var(--slate);margin-top:14px;
}

/* security */
.sec-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sec-item{background:var(--paper-raised);border:1px solid var(--rule);border-radius:var(--radius-md);padding:24px;box-shadow:0 1px 2px color-mix(in srgb,var(--shadow) 10%,transparent)}
.sec-item h3{font-size:var(--font-size-md);font-weight:600;margin-bottom:8px}
.sec-item p{font-size:var(--font-size-sm);color:var(--slate)}

 

/* footer */
footer{background:var(--criterion-dark);color:#CBD5E1;font-size:var(--font-size-xs);border-top:1px solid #A8C4E0}
footer .wrap{
  display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;
  padding-top:34px;padding-bottom:40px;
}
footer a{color:#E0ECF8;text-decoration:none}
footer a:hover{color:#fff;text-decoration:underline}
footer .cols{display:flex;gap:56px;flex-wrap:wrap}
footer h4{
  font-family:var(--font-mono);font-size:var(--font-size-xs);letter-spacing:.14em;
  text-transform:uppercase;color:#A8C4E0;margin-bottom:12px;font-weight:700;
}
footer ul{list-style:none}
footer li{margin-bottom:8px}
footer .brand{max-width:280px}
footer .brand .wordmark{color:#fff;font-size:1.1875rem}
footer .brand p{margin-top:12px}
footer .site-version{
  color:#A8C4E0;
  font-family:var(--font-mono);
  font-size:var(--font-size-xs);
}

/* ---------- responsive ---------- */
@media (max-width:920px){
  .hero .wrap{grid-template-columns:1fr;gap:44px}
  .principles{grid-template-columns:1fr}
  .roles{grid-template-columns:repeat(2,1fr)}
  .rigour{grid-template-columns:1fr;gap:36px}
  .sec-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  nav.primary{display:none}
  .menu-toggle{
    display:block;margin-left:auto;background:none;border:1px solid var(--rule);
    border-radius:var(--radius-sm);padding:7px 12px;font-family:var(--font-body);font-size:var(--font-size-sm);cursor:pointer;
  }
  nav.primary.open{
    display:flex;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;background:var(--paper);border-bottom:1px solid var(--rule);
    padding:18px 24px;gap:16px;
  }
  .roles{grid-template-columns:1fr}
  .sec-grid{grid-template-columns:1fr}
  section{padding:60px 0}
  .hero{padding:56px 0}
}