:root{
  --paper:#F6F4EE;--card:#FFFFFF;--ink:#0E0E10;--sub:#5F5E66;--line:#DAD6CC;
  --violet:#5B3DF5;--violet-2:#8F7BFF;--mint:#12B886;--amber:#F59F00;--rose:#E8590C;
  --mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font:16px/1.6 var(--sans);color:var(--ink);background:var(--paper);
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:32px 32px;background-position:-1px -1px}
body::before{content:"";position:fixed;inset:0;background:radial-gradient(ellipse at 50% 0,rgba(246,244,238,.2),var(--paper) 70%);pointer-events:none;z-index:-1}
a{color:inherit}
button{font:inherit}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1.5px solid var(--ink);border-radius:6px;
  padding:10px 18px;font-weight:600;cursor:pointer;text-decoration:none;background:transparent;transition:transform .15s,background .15s,color .15s}
.btn:hover{transform:translate(-2px,-2px);box-shadow:3px 3px 0 var(--ink)}
.btn:focus-visible,.gate:focus-visible,.slot:focus-visible,summary:focus-visible{outline:3px solid var(--violet);outline-offset:2px}
.btn.ink{background:var(--ink);color:var(--paper)}
.btn.violet{background:var(--violet);border-color:var(--violet);color:#fff}
.btn.violet:hover{box-shadow:3px 3px 0 var(--ink)}
.btn.line{background:var(--card)}
.btn.sm{padding:6px 12px;font-size:13px}
.btn.wide{width:100%}
.btn:disabled{opacity:.55;cursor:wait;transform:none;box-shadow:none}

/* header */
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:28px;padding:14px 40px;
  background:rgba(246,244,238,.9);backdrop-filter:blur(8px);border-bottom:1.5px solid var(--ink)}
.mark{display:flex;align-items:center;gap:10px;font:700 20px var(--mono);letter-spacing:.06em;text-decoration:none}
.orb{width:22px;height:22px;border-radius:50%;border:2.5px solid var(--violet);position:relative;display:inline-block}
.orb::after{content:"";position:absolute;inset:5px;border-radius:50%;background:var(--ink);animation:orb 3s ease-in-out infinite}
@keyframes orb{50%{transform:scale(.4);background:var(--violet)}}
.top nav{display:flex;gap:24px;margin-left:auto;font-size:14px}
.top nav a{text-decoration:none;color:var(--sub)}
.top nav a:hover{color:var(--ink)}

main{max-width:1200px;margin:0 auto;padding:0 40px}
section{padding:72px 0 24px}
.sec-head{display:grid;grid-template-columns:64px 1fr;column-gap:16px;align-items:baseline;margin-bottom:28px}
.sec-head .idx{font:700 14px var(--mono);color:var(--violet);border:1.5px solid var(--violet);border-radius:4px;padding:2px 8px;justify-self:start}
.sec-head h2{font:600 40px/1.1 var(--serif);letter-spacing:-.01em}
.sec-head p{grid-column:2;color:var(--sub);max-width:640px;margin-top:8px}

/* hero */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding-top:64px;min-height:calc(100vh - 70px)}
.eyebrow{font:600 12px var(--mono);letter-spacing:.18em;color:var(--violet);margin-bottom:18px}
.hero h1{font:600 clamp(44px,6vw,80px)/1.02 var(--serif);letter-spacing:-.02em}
.hero h1 em{font-style:italic;color:var(--violet)}
.lede{font-size:18px;color:var(--sub);max-width:540px;margin:24px 0 28px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.specs{display:grid;grid-template-columns:repeat(4,1fr);margin-top:44px;border:1.5px solid var(--ink);background:var(--card);border-radius:8px;overflow:hidden}
.specs div{padding:14px 16px;border-right:1px solid var(--line)}
.specs div:last-child{border-right:0}
.specs dt{font:500 11px var(--mono);color:var(--sub);text-transform:uppercase;letter-spacing:.08em}
.specs dd{font:700 26px var(--mono);margin-top:2px}
.bloch{background:var(--card);border:1.5px solid var(--ink);border-radius:12px;padding:16px;box-shadow:8px 8px 0 var(--ink)}
.bloch canvas{width:100%;height:auto;display:block}
.bloch figcaption{font:13px var(--mono);color:var(--sub);text-align:center;padding-top:10px;border-top:1px dashed var(--line);margin-top:8px}

/* rig bench */
.bench{background:var(--card);border:1.5px solid var(--ink);border-radius:12px;overflow:hidden}
.palette{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:14px 18px;border-bottom:1.5px solid var(--ink);background:#FBFAF6}
.gate{width:44px;height:44px;border-radius:6px;border:1.5px solid var(--ink);font:700 15px var(--mono);cursor:pointer;background:var(--card);transition:transform .12s}
.gate:hover{transform:translateY(-2px)}
.gate.on{box-shadow:0 0 0 3px var(--violet)}
.g-h{background:#EDE8FF;color:var(--violet)}
.g-x{background:#E3F8F0;color:var(--mint)}
.g-z{background:#FFF4DB;color:#B07400}
.g-t{background:#FFE8DC;color:var(--rose)}
.g-cx{background:var(--ink);color:#fff}
.g-del{color:var(--sub)}
.sep{flex:1}
.circuit{padding:22px 18px 22px 64px;display:grid;gap:14px;overflow-x:auto}
.wire{position:relative;display:grid;grid-template-columns:repeat(8,52px);gap:10px;align-items:center;min-width:520px}
.wire::before{content:"";position:absolute;left:-10px;right:0;top:50%;height:2px;background:var(--ink);z-index:0}
.wire .lbl{position:absolute;left:-52px;font:600 14px var(--mono);color:var(--sub)}
.slot{position:relative;z-index:1;width:52px;height:44px;border-radius:6px;border:1.5px dashed transparent;background:transparent;cursor:pointer;
  font:700 15px var(--mono);transition:background .12s,border-color .12s}
.slot:hover{border-color:var(--violet);background:rgba(91,61,245,.06)}
.slot.filled{border:1.5px solid var(--ink)}
.slot.ctrl::after{content:"";position:absolute;left:50%;top:100%;width:2px;height:16px;background:var(--ink);transform:translateX(-50%)}
.slot.tgt{border-radius:50%;width:44px;justify-self:center}
.readout{display:grid;grid-template-columns:1fr 300px;border-top:1.5px solid var(--ink)}
.hist-wrap{padding:18px;border-right:1.5px solid var(--ink)}
.readout h3{font:600 12px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--sub);margin-bottom:12px}
.hist{display:grid;grid-template-columns:repeat(16,1fr);gap:4px;align-items:end;height:180px}
.hist .col{display:flex;flex-direction:column;justify-content:flex-end;height:100%;gap:4px}
.hist .b{background:var(--violet);border-radius:3px 3px 0 0;min-height:2px;transition:height .35s cubic-bezier(.2,.8,.2,1)}
.hist .b.hit{background:var(--amber)}
.hist .k{font:10px var(--mono);color:var(--sub);text-align:center;writing-mode:vertical-rl;transform:rotate(180deg);height:34px}
.meter{padding:18px;display:flex;flex-direction:column;gap:10px}
.meter .big b{font:700 44px var(--mono)}
.meter .big span{font:13px var(--mono);color:var(--sub);margin-left:6px}
.bar{height:10px;border:1.5px solid var(--ink);border-radius:999px;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--violet),var(--violet-2));transition:width .35s}
.note{font-size:12px;color:var(--sub)}

.ticket{margin-top:24px;background:var(--card);border:1.5px solid var(--ink);border-radius:12px;position:relative;
  box-shadow:8px 8px 0 var(--violet);animation:drop .4s cubic-bezier(.2,.9,.3,1.3)}
@keyframes drop{from{transform:translateY(-12px);opacity:0}}
.t-head{display:flex;justify-content:space-between;padding:12px 18px;border-bottom:1.5px dashed var(--ink);font:700 13px var(--mono);letter-spacing:.14em}
.t-body{display:grid;grid-template-columns:repeat(4,1fr)}
.t-body div{padding:14px 18px;border-right:1px solid var(--line)}
.t-body div:last-child{border-right:0}
.t-body small{display:block;font:11px var(--mono);color:var(--sub);text-transform:uppercase;letter-spacing:.08em}
.t-body b{font:700 24px var(--mono)}
.ticket code{display:block;padding:10px 18px;font:12px var(--mono);color:var(--sub);background:#FBFAF6;border-top:1px solid var(--line);border-bottom:1px solid var(--line);word-break:break-all}
.t-foot{display:flex;align-items:center;gap:16px;padding:14px 18px;flex-wrap:wrap}
.status{font-size:13px;color:var(--sub);flex:1;min-width:220px}
.status a{color:var(--violet)}
.log{list-style:none;margin-top:16px;display:flex;gap:8px;flex-wrap:wrap}
.log li{font:12px var(--mono);border:1px solid var(--line);background:var(--card);border-radius:4px;padding:4px 8px}

/* protocol */
.steps{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);border:1.5px solid var(--ink);border-radius:12px;overflow:hidden;background:var(--card)}
.steps li{padding:22px;border-right:1px solid var(--line);counter-increment:s}
.steps li:last-child{border-right:0}
.steps span{font:600 11px var(--mono);color:var(--violet);letter-spacing:.14em;text-transform:uppercase}
.steps span::before{content:"0" counter(s) " · "}
.steps h3{font:600 22px var(--serif);margin:10px 0 8px}
.steps p{font-size:14px;color:var(--sub)}
.formula{margin-top:24px;border-left:4px solid var(--violet);padding:16px 22px;background:var(--card)}
.f-label{font:600 11px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--sub)}
.f-math{font:italic 26px var(--serif);margin:8px 0}
.f-note{font-size:14px;color:var(--sub)}

/* board */
.tbl{width:100%;border-collapse:collapse;background:var(--card);border:1.5px solid var(--ink);border-radius:12px;overflow:hidden;font:14px var(--mono)}
.tbl th{text-align:left;font-weight:600;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--sub);padding:12px 18px;border-bottom:1.5px solid var(--ink);background:#FBFAF6}
.tbl td{padding:12px 18px;border-bottom:1px solid var(--line)}
.tbl tr:last-child td{border-bottom:0}
.tbl tr.me td{background:#EDE8FF}
.tbl td:last-child{font-weight:700;color:var(--violet)}

/* vault */
.vault-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1.5px solid var(--ink);border-radius:12px;overflow:hidden;background:var(--card)}
.cell{padding:22px;border-right:1px solid var(--line)}
.cell:last-child{border-right:0}
.cell b{display:block;font:700 40px var(--mono);color:var(--violet)}
.cell span{font-size:13px;color:var(--sub)}
.vault-text{max-width:820px;color:var(--sub);margin:20px 0}
.ca{display:flex;align-items:center;gap:12px;max-width:680px;border:1.5px solid var(--ink);border-radius:8px;background:var(--card);padding:8px 8px 8px 16px}
.ca span{font:600 12px var(--mono);color:var(--sub);text-transform:uppercase}
.ca code{flex:1;font:13px var(--mono);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* faq */
.faq details{background:var(--card);border:1.5px solid var(--ink);border-radius:8px;margin-bottom:10px;max-width:860px}
.faq summary{cursor:pointer;padding:16px 20px;font-weight:600;list-style:none;display:flex;justify-content:space-between}
.faq summary::after{content:"+";font:700 18px var(--mono);color:var(--violet)}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 20px 18px;color:var(--sub)}

.foot{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:32px 40px;margin-top:72px;border-top:1.5px solid var(--ink);font-size:13px;color:var(--sub);flex-wrap:wrap}

@media (max-width:960px){
  .hero{grid-template-columns:1fr;min-height:0}
  .readout{grid-template-columns:1fr}
  .hist-wrap{border-right:0;border-bottom:1.5px solid var(--ink)}
  .steps,.vault-grid{grid-template-columns:1fr 1fr}
  .steps li:nth-child(2),.cell:nth-child(2){border-right:0}
  .steps li:nth-child(-n+2),.cell:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .t-body{grid-template-columns:1fr 1fr}
}
@media (max-width:620px){
  .top{padding:12px 16px;gap:12px}
  .top nav{display:none}
  .top .btn{margin-left:auto;padding:8px 12px;font-size:13px}
  main{padding:0 16px}
  .sec-head{grid-template-columns:1fr}
  .sec-head p{grid-column:1}
  .sec-head h2{font-size:32px}
  .specs{grid-template-columns:1fr 1fr}
  .specs div:nth-child(2){border-right:0}
  .specs div:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .steps,.vault-grid{grid-template-columns:1fr}
  .steps li,.cell{border-right:0!important;border-bottom:1px solid var(--line)}
  .circuit{padding-left:52px}
  .tbl th:nth-child(4),.tbl td:nth-child(4){display:none}
  .foot{padding:24px 16px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* gate colours on the wire (must beat .slot background) */
.slot.g-h{background:#EDE8FF;color:var(--violet)}
.slot.g-x{background:#E3F8F0;color:var(--mint)}
.slot.g-z{background:#FFF4DB;color:#B07400}
.slot.g-t{background:#FFE8DC;color:var(--rose)}
.slot.ctrl{background:transparent;border-color:transparent;color:var(--ink);font-size:26px;line-height:1}
.slot.ctrl::after{height:30px}
.slot.tgt{background:var(--card);font-size:24px;line-height:1}