/* ARACHNE v30.5 — design tokens & base
   Palette: three values only. Deep space black, lattice white, one quantum-blue accent.
   No gradients. No shadows pretending to be depth. Every line earns its place. */
:root{
  --bg:#080909;          /* deep space black */
  --surf:#0E0F11;        /* panel */
  --line:#1C2026;        /* hairline */
  --ink:#F2F3F5;         /* lattice white */
  --dim:#9BA1AB;         /* secondary text */
  --faint:#767D87;       /* captions / mono labels — WCAG-AA 4.8:1 on bg */
  --accent:#3B9EFF;      /* quantum blue — the ONLY accent */
  --accent-deep:#2E7CF6; /* deeper accent (reserved) */
  --accent-ink:#061626;  /* dark text for on-accent surfaces */
  --disp:'Space Grotesk',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
  --maxw:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--disp);line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}
::selection{background:var(--accent);color:#04101f}

/* layout */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,40px)}
section{padding:clamp(64px,10vw,120px) 0;border-top:1px solid var(--line)}

/* header / nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(8,9,9,.82);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:22px;height:64px}
.brand{display:flex;align-items:center;gap:11px;margin-right:auto}
.brand svg{width:28px;height:28px;flex:0 0 auto}
.brand .nm{font-weight:600;font-size:16px;letter-spacing:-.01em}
.brand .nm b{color:var(--accent);font-weight:600}
.nav a.lnk{font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  text-transform:uppercase;color:var(--dim);transition:color .2s}
.nav a.lnk:hover{color:var(--ink)}
@keyframes breathe{0%,100%{opacity:.55}50%{opacity:1}}
.brand svg circle[fill]{animation:breathe 3.2s ease-in-out infinite}

/* kicker + headings */
.kick{font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--faint);display:flex;align-items:center;
  gap:12px;margin-bottom:18px}
.kick::before{content:"";width:34px;height:1px;background:var(--accent)}
h1{font-weight:700;font-size:clamp(38px,7vw,76px);letter-spacing:-.03em;line-height:1.02}
h2{font-weight:700;font-size:clamp(26px,4.4vw,44px);letter-spacing:-.02em;line-height:1.1}
.lede{color:var(--dim);font-size:clamp(16px,2.1vw,20px);max-width:64ch;margin-top:20px}
p.body{color:var(--dim);font-size:17px;max-width:62ch;margin-top:16px}

/* buttons — verbs, not fluff */
.cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.btn{font-family:var(--disp);font-weight:600;font-size:15px;letter-spacing:-.01em;
  padding:14px 24px;border:1px solid var(--line);border-radius:2px;
  display:inline-flex;align-items:center;gap:10px;cursor:pointer;
  transition:border-color .2s,background .2s,color .2s;background:transparent;color:var(--ink)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:700}
.btn.primary:hover{background:#5CB0FF;border-color:#5CB0FF}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent)}
/* full state set (per web-button-system contract): rest·hover·active·focus·disabled */
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none}

/* epistemic state badges (web-epistemic-ui) — state by mark + label, quantum-blue/neutral only */
.ep{display:inline-flex;align-items:center;gap:7px;font-family:var(--mono);font-size:10.5px;
  letter-spacing:.1em;text-transform:uppercase;line-height:1;white-space:nowrap;
  border:1px solid var(--line);border-radius:2px;padding:5px 9px;color:var(--dim)}
.ep .mk{width:9px;height:9px;border-radius:50%;flex:0 0 auto;box-sizing:border-box}
.ep.proven{color:var(--accent);border-color:rgba(59,158,255,.42)}
.ep.proven .mk{background:var(--accent)}
.ep.building{color:var(--accent)}
.ep.building .mk{background:transparent;border:2px solid var(--accent)}
.ep.unclaimed{color:var(--dim)}
.ep.unclaimed .mk{background:transparent;border:2px solid var(--faint)}
/* epistemic strip — mechanism/efficacy split + data request */
.epi{display:flex;flex-wrap:wrap;gap:10px 12px;align-items:center;margin-top:24px;
  border:1px solid var(--line);border-radius:3px;padding:15px 17px}
.epi .sep{color:var(--faint);font-family:var(--mono);font-size:11px}
.epi .dr{flex-basis:100%;font-family:var(--mono);font-size:11px;color:var(--faint);
  letter-spacing:.02em;margin-top:2px}
.epi .dr b{color:var(--dim);font-weight:500}
.prov{font-family:var(--mono);font-size:11px;color:var(--faint);letter-spacing:.02em;
  margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}
.prov b{color:var(--dim);font-weight:500}

/* scroll choreography (web-scroll-choreography) — enhancement only; hidden state gated by .reveal */
.reveal .rv{opacity:0;transform:translateY(12px);
  transition:opacity .55s cubic-bezier(.2,.6,.2,1),transform .55s cubic-bezier(.2,.6,.2,1)}
.reveal .rv.in{opacity:1;transform:none}

/* motion + spacing tokens (web-design-token-forge, web-motion-system) */
:root{--dur:.2s;--ease:cubic-bezier(.2,.6,.2,1);--sp:8px;--radius:2px}
/* skip link (web-focus-and-keyboard, web-semantic-html) */
.skip{position:absolute;left:-9999px;top:0;z-index:100;background:var(--accent);color:var(--accent-ink);
  padding:10px 16px;font-family:var(--mono);font-size:12px;font-weight:500;border-radius:0 0 3px 0}
.skip:focus{left:0}
main{display:block} main:focus{outline:none}
/* active nav semantics (web-nav-systems) */
.nav a.lnk[aria-current="page"]{color:var(--ink)}
/* microinteractions (web-microinteractions) — interactive elements only, motion-safe */
@media(prefers-reduced-motion:no-preference){
  .brand svg use,.brand{transition:opacity var(--dur) var(--ease)}
  .vec tbody tr,.copyable{transition:background var(--dur) var(--ease)}
}

/* responsive (web-responsive-strategy) — nav reflow + horizontal-overflow guard */
html,body{overflow-x:hidden}
@media(max-width:720px){
  .nav .wrap{flex-wrap:wrap;height:auto;min-height:56px;padding-top:11px;padding-bottom:11px;
    gap:9px 18px;column-gap:18px;row-gap:9px}
  .brand{margin-right:auto}
  .nav a.lnk{font-size:11px;letter-spacing:.05em}
  .claim{gap:14px}
  h1{font-size:clamp(34px,10vw,60px)}
}
.btn .arw{font-family:var(--mono);opacity:.7}

/* hero */
.hero{position:relative;padding-top:clamp(40px,8vw,88px);border-top:none}
.hero canvas{display:block;width:100%;height:min(56vh,520px);margin-bottom:8px}
.hero .cap{font-family:var(--mono);font-size:11px;color:var(--faint);letter-spacing:.02em}

/* briefing / video */
.player{margin:26px auto 0;max-width:560px;border:1px solid var(--line);border-radius:4px;
  position:relative;aspect-ratio:1/1;overflow:hidden;background:var(--surf);cursor:pointer;
  display:flex;align-items:center;justify-content:center}
.player::after{content:"";position:absolute;inset:0;background:rgba(8,9,9,.45);z-index:0}
.player .placeholder{position:relative;z-index:1}
.player .placeholder{text-align:center}
.player .playbtn{width:64px;height:64px;border-radius:50%;border:1px solid var(--accent);
  display:inline-flex;align-items:center;justify-content:center;color:var(--accent);
  font-size:22px;margin-bottom:14px;transition:background .2s,color .2s}
.player .playbtn:hover{background:var(--accent);color:#04101f}
.player .plabel{font-family:var(--mono);font-size:12px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--dim)}
.player .pnote{font-family:var(--mono);font-size:10.5px;color:var(--faint);margin-top:8px}

/* two-column claim rows */
.claim{display:grid;grid-template-columns:1fr;gap:10px}
@media(min-width:760px){.claim{grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:48px;align-items:start}}
.claim .num{font-family:var(--mono);font-size:11px;color:var(--accent);letter-spacing:.14em}

/* footer */
footer{border-top:1px solid var(--line);padding:34px 0;font-family:var(--mono);
  font-size:11px;color:var(--faint);line-height:1.9}
footer .wrap{display:flex;flex-wrap:wrap;gap:8px 28px;justify-content:space-between}
footer b{color:var(--dim);font-weight:500}