/* ==========================================================================
   NORDAN — precisionfocusbrain.xyz
   Visual language: blueprint / architecture sheet.
   Pale drafting paper, navy ink, signal orange, fine grid, layered bands.
   ========================================================================== */

/* ---- reset ------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

/* ---- tokens ------------------------------------------------------------ */
:root{
  --bp:#eef2f7;
  --bp-2:#e6ecf4;
  --sheet:#f7fafc;
  --ink:#12263c;
  --ink-2:#25405c;
  --body:#3d5570;
  --muted:#6d8298;
  --grid:rgba(64,110,160,.13);
  --grid-2:rgba(64,110,160,.07);
  --line:#b9cade;
  --line-2:#8fa8c2;
  --orange:#e2622a;
  --orange-d:#b84a1c;
  --steel:#4a7ba7;

  --f-head:'Barlow Condensed',system-ui,sans-serif;
  --f-body:'Inter',system-ui,-apple-system,sans-serif;
  --f-mono:'Roboto Mono',ui-monospace,SFMono-Regular,Menlo,monospace;

  --maxw:1160px;
  --gutter:clamp(18px,4.5vw,44px);
  --ease:cubic-bezier(.2,.7,.3,1);
  --ease-out:cubic-bezier(.16,1,.3,1);
}

/* ---- ground ------------------------------------------------------------ */
html{background:var(--bp)}
body{
  font-family:var(--f-body);
  font-size:clamp(15.5px,1vw,17px);
  line-height:1.72;
  color:var(--body);
  background:
    radial-gradient(900px 540px at 88% -8%,rgba(226,98,42,.07),transparent 62%),
    linear-gradient(180deg,#eff3f8 0%,#e9eff6 60%,#eff3f8 100%);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
/* drafting grid: 8px fine + 40px major */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(var(--grid-2) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-2) 1px,transparent 1px),
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:8px 8px,8px 8px,40px 40px,40px 40px;
}
.wrap{position:relative;z-index:2}
.shell{width:min(100% - 2*var(--gutter),var(--maxw));margin-inline:auto}

/* ---- type -------------------------------------------------------------- */
h1,h2,h3{font-family:var(--f-head);color:var(--ink);font-weight:600;line-height:1.06;
  letter-spacing:.005em;text-transform:uppercase}
h1{font-size:clamp(2.3rem,6.2vw,4.4rem);line-height:.96}
h2{font-size:clamp(1.5rem,3.2vw,2.3rem)}
h3{font-size:clamp(1.05rem,1.6vw,1.3rem);letter-spacing:.02em}
p{margin-block:0 1.15em}
strong{color:var(--ink);font-weight:600}
a{color:var(--orange-d);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--ink)}
em{font-style:italic}

.sheet-no{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--orange);font-weight:500}
.lede{font-size:clamp(1.04rem,1.4vw,1.22rem);line-height:1.62;color:var(--ink-2)}

/* ---- skip + focus ------------------------------------------------------ */
.skip{position:absolute;left:12px;top:-64px;z-index:100;background:var(--ink);color:#fff;
  padding:12px 18px;font-weight:600;transition:top .25s var(--ease)}
.skip:focus{top:12px}
:focus-visible{outline:2.5px solid var(--orange);outline-offset:3px}

/* ---- header ------------------------------------------------------------ */
.hdr{background:rgba(238,242,247,.88);backdrop-filter:blur(10px);border-bottom:1.5px solid var(--ink);
  position:sticky;top:0;z-index:40}
.hdr__in{display:flex;align-items:center;gap:clamp(12px,3vw,30px);min-height:62px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}
.brand:hover{text-decoration:none}
.brand b{font-family:var(--f-head);font-weight:600;font-size:1.12rem;letter-spacing:.04em;text-transform:uppercase}
.brand b i{font-style:normal;color:var(--orange)}
.nav{margin-left:auto;display:flex;gap:clamp(10px,2vw,24px)}
.nav a{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);
  text-decoration:none;padding:6px 0;border-bottom:2px solid transparent;white-space:nowrap;
  transition:color .25s var(--ease),border-color .25s var(--ease)}
.nav a:hover,.nav a.is-on{color:var(--ink);border-bottom-color:var(--orange);text-decoration:none}

/* ---- hero -------------------------------------------------------------- */
.hero{padding:clamp(40px,6vw,80px) 0 clamp(26px,3.5vw,44px)}
.hero__grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,.8fr);
  gap:clamp(26px,4vw,58px);align-items:start}
.hero h1{margin:.35em 0 .5em;max-width:20ch}
.hero .lede{max-width:52ch}
.specsheet{border:1.5px solid var(--ink);background:var(--sheet)}
.specsheet h2{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.18em;color:var(--muted);
  padding:11px 15px;border-bottom:1px solid var(--line);font-weight:500;text-transform:uppercase}
.specsheet dl{padding:4px 15px 12px}
.specsheet .row{display:flex;justify-content:space-between;gap:14px;padding:10px 0;
  border-bottom:1px dashed var(--line);font-family:var(--f-mono);font-size:.76rem}
.specsheet .row:last-child{border-bottom:0}
.specsheet dt{color:var(--muted)}
.specsheet dd{color:var(--ink);text-align:right;font-weight:500}

/* sheet frame around figures */
.frame{position:relative;border:1.5px solid var(--ink);background:var(--sheet);padding:8px}
.frame img{width:100%;height:clamp(220px,38vw,430px);object-fit:cover;filter:saturate(.92)}
.frame figcaption{display:flex;gap:12px;align-items:baseline;padding:12px 6px 4px;
  font-family:var(--f-mono);font-size:.72rem;color:var(--muted)}
.frame figcaption b{color:var(--orange);flex:0 0 auto}
/* corner ticks */
.frame::before,.frame::after{content:"";position:absolute;width:12px;height:12px;pointer-events:none}
.frame::before{left:-1px;top:-1px;border-left:2.5px solid var(--orange);border-top:2.5px solid var(--orange)}
.frame::after{right:-1px;bottom:-1px;border-right:2.5px solid var(--orange);border-bottom:2.5px solid var(--orange)}

/* ---- document ---------------------------------------------------------- */
.doc{padding:clamp(34px,5vw,66px) 0 clamp(46px,6.5vw,90px)}
.sheetx{border:1.5px solid var(--ink);background:var(--sheet);margin-bottom:26px}
.sheetx__hd{display:flex;align-items:baseline;gap:16px;padding:16px 20px;border-bottom:1.5px solid var(--ink);
  background:linear-gradient(180deg,rgba(64,110,160,.05),transparent);flex-wrap:wrap}
.sheetx__hd .no{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.16em;color:var(--orange);
  font-weight:500;flex:0 0 auto}
.sheetx__hd h2{margin:0;font-size:clamp(1.3rem,2.6vw,1.85rem)}
.sheetx__hd .tag{margin-left:auto;font-family:var(--f-mono);font-size:.66rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--muted);border:1px solid var(--line);padding:4px 9px}
.sheetx__bd{padding:clamp(20px,3vw,32px)}
.prose{max-width:70ch}
.prose p{margin-bottom:1.15em}
.prose ul{margin:0 0 1.2em;display:flex;flex-direction:column;gap:.5em}
.prose li{position:relative;padding-left:1.6em}
.prose li::before{content:"";position:absolute;left:2px;top:.65em;width:7px;height:7px;
  border:1.5px solid var(--orange);transform:rotate(45deg)}

/* layer stack */
.stack{display:flex;flex-direction:column;gap:0;margin:1.7em 0;border:1.5px solid var(--ink)}
.layer{display:grid;grid-template-columns:150px 1fr;gap:0;border-bottom:1px solid var(--line)}
.layer:last-child{border-bottom:0}
.layer__id{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  color:#fff;background:var(--ink);padding:16px 14px;display:flex;flex-direction:column;justify-content:center;gap:5px}
.layer__id b{font-size:.82rem;letter-spacing:.06em;color:#fff;font-weight:500}
.layer__id span{color:#9db6d0;font-size:.62rem}
.layer:nth-child(2) .layer__id{background:#1d3a58}
.layer:nth-child(3) .layer__id{background:#2a4f74}
.layer:nth-child(4) .layer__id{background:var(--orange-d)}
.layer__bd{padding:15px 18px}
.layer__bd h3{margin-bottom:.3em;font-size:1.02rem;text-transform:none;letter-spacing:0;font-family:var(--f-body);
  font-weight:600}
.layer__bd p{margin:0;font-size:.9rem;color:var(--muted);line-height:1.62}

/* flow chain */
.chain{display:flex;flex-wrap:wrap;align-items:stretch;gap:0;margin:1.7em 0}
.chain__node{flex:1 1 150px;border:1.5px solid var(--ink);background:var(--sheet);padding:14px 15px;
  position:relative;min-width:0}
.chain__node + .chain__node{border-left:0}
.chain__node b{display:block;font-family:var(--f-head);text-transform:uppercase;font-size:1rem;
  color:var(--ink);letter-spacing:.02em;margin-bottom:4px}
.chain__node span{font-size:.82rem;color:var(--muted)}
.chain__node em{position:absolute;right:-9px;top:50%;transform:translateY(-50%);z-index:2;
  width:18px;height:18px;background:var(--orange);color:#fff;font-style:normal;font-size:.7rem;
  display:grid;place-items:center;border-radius:50%}
.chain__node:last-child em{display:none}

/* function list */
.fns{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1px;background:var(--line);
  border:1.5px solid var(--ink);margin:1.6em 0}
.fn{background:var(--sheet);padding:18px 16px}
.fn b{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.14em;color:var(--orange);display:block;margin-bottom:8px}
.fn h3{font-family:var(--f-body);font-size:1rem;text-transform:none;letter-spacing:0;margin-bottom:.35em}
.fn p{font-size:.86rem;color:var(--muted);margin:0;line-height:1.6}

/* roadmap */
.road{counter-reset:r;margin:1.6em 0;display:flex;flex-direction:column}
.road li{display:grid;grid-template-columns:56px 1fr;gap:16px;padding:14px 0;border-bottom:1px dashed var(--line)}
.road li:last-child{border-bottom:0}
.road li::before{counter-increment:r;content:"0" counter(r);font-family:var(--f-mono);font-size:.8rem;
  color:var(--orange);padding-top:2px}
.road b{color:var(--ink);font-weight:600}

/* ---- faq --------------------------------------------------------------- */
.faq{border-top:1.5px solid var(--ink)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;padding:17px 42px 17px 30px;position:relative;font-weight:600;color:var(--ink);
  list-style:none;font-size:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";position:absolute;left:0;top:50%;transform:translateY(-50%);
  font-family:var(--f-mono);color:var(--orange);font-size:1rem}
.faq details[open] summary::before{content:"\2212"}
.faq summary::after{content:"";position:absolute;right:8px;top:50%;width:9px;height:9px;
  border-right:1.5px solid var(--orange);border-bottom:1.5px solid var(--orange);
  transform:translateY(-70%) rotate(45deg);transition:transform .3s var(--ease)}
.faq details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq summary:hover{color:var(--orange-d)}
.faq .a{padding:0 0 20px 30px;font-size:.94rem;max-width:68ch}
.faq .a p:last-child{margin-bottom:0}

/* ---- reveal ------------------------------------------------------------ */
.rv{opacity:0;transform:translateY(16px);transition:opacity .75s var(--ease-out),transform .75s var(--ease-out)}
.rv.in{opacity:1;transform:none}
.no-js .rv{opacity:1;transform:none}

/* ---- footer ------------------------------------------------------------ */
.ftr{background:var(--ink);color:#b9cade;padding:clamp(42px,6vw,68px) 0 28px;margin-top:16px}
.ftr a{color:#f0b394}
.ftr__top{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1.5fr);gap:clamp(26px,5vw,56px);
  padding-bottom:30px;border-bottom:1px solid rgba(185,202,222,.2)}
.ftr__brand b{font-family:var(--f-head);font-size:1.3rem;color:#fff;font-weight:600;text-transform:uppercase;
  letter-spacing:.03em;display:flex;align-items:center;gap:10px}
.ftr__brand b i{font-style:normal;color:#f09a68}
.ftr__brand p{margin-top:13px;font-size:.87rem;color:#93aac4;max-width:40ch}
.linknet__label{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;
  color:#93aac4;margin-bottom:14px}
.linknet ul{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:9px 22px}
.linknet a{display:block;font-size:.86rem;padding:6px 0;text-decoration:none;color:#d7e2ee;
  border-bottom:1px solid transparent;transition:border-color .25s var(--ease),color .25s var(--ease)}
.linknet a:hover{color:#fff;border-bottom-color:rgba(185,202,222,.45)}
.linknet small{display:block;font-family:var(--f-mono);font-size:.68rem;color:#93aac4}
.ftr__legal{padding-top:22px;display:flex;flex-wrap:wrap;gap:12px 28px;justify-content:space-between;
  font-family:var(--f-mono);font-size:.7rem;color:#93aac4}

/* ---- responsive -------------------------------------------------------- */
@media (max-width:960px){
  .hero__grid{grid-template-columns:1fr;gap:28px}
  .hero h1{max-width:none}
  .ftr__top{grid-template-columns:1fr;gap:28px}
}
@media (max-width:680px){
  .nav{display:none}
  .layer{grid-template-columns:1fr}
  .layer__id{flex-direction:row;align-items:center;gap:10px;justify-content:flex-start;padding:11px 14px}
  .chain{flex-direction:column}
  .chain__node + .chain__node{border-left:1.5px solid var(--ink);border-top:0}
  .chain__node em{right:auto;left:50%;top:auto;bottom:-9px;transform:translateX(-50%) rotate(90deg)}
  .sheetx__hd{gap:10px}
  .sheetx__hd .tag{margin-left:0}
  .ftr__legal{flex-direction:column;gap:9px}
}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .rv{opacity:1;transform:none}
}