/* PROTEL 2026 — Binary Systems, Inc. */
@font-face{font-family:"Saira Stencil One";src:url("fonts/SairaStencilOne-Regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url("fonts/IBMPlexMono-Regular.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url("fonts/IBMPlexMono-SemiBold.woff2") format("woff2");font-weight:600;font-display:swap}
:root{
  --night:#071318;--frame:#0D2029;--cable:#1E3A47;--steel:#7E97A3;--paper:#EFE7D4;
  --amber:#FFB300;--lamp:#FF6B1A;--teal:#2EC4B6;--amberdeep:#C47F00;
  --body:"Lucida Grande","Lucida Sans Unicode",Arial,Verdana,sans-serif;
  --display:"Saira Stencil One",Impact,"Arial Narrow Bold",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --wrap:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--night);color:var(--paper);font-family:var(--body);font-size:17px;line-height:1.6;overflow-x:hidden}
img,svg{max-width:100%}
a{color:var(--amber)}
a:focus-visible,button:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
.skip{position:absolute;left:-999px;top:8px;background:var(--amber);color:var(--night);padding:8px 14px;z-index:99;font-weight:700}
.skip:focus{left:8px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}
code,pre,kbd,.mono{font-family:var(--mono)}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(7,19,24,.86);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid rgba(126,151,163,.16)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px;gap:18px}
.brand{display:flex;align-items:center;gap:10px;color:var(--paper);text-decoration:none}
.brand img{width:34px;height:34px}
.brand b{font-family:var(--display);font-weight:400;font-size:24px;letter-spacing:.04em;line-height:1}
.brand small{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--steel);border-left:1px solid var(--cable);padding-left:10px}
.nav ul{display:flex;align-items:center;gap:24px;list-style:none;margin:0;padding:0}
.nav ul a{color:var(--paper);text-decoration:none;font-size:13px;letter-spacing:.08em;text-transform:uppercase;opacity:.85}
.nav ul a:hover{color:var(--amber);opacity:1}
.btn{display:inline-flex;align-items:center;gap:10px;font-family:var(--display);font-size:16px;letter-spacing:.06em;text-transform:uppercase;text-decoration:none;color:var(--night)!important;background:var(--amber);padding:14px 24px;border:2px solid var(--amber);clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);transition:background .15s,color .15s;opacity:1!important}
.btn:hover{background:var(--paper);border-color:var(--paper)}
.btn.ghost{background:transparent;color:var(--paper)!important;border-color:var(--paper)}
.btn.ghost:hover{background:var(--paper);color:var(--night)!important}
.btn.sm{font-size:13px;padding:9px 16px}
.nav .btn{font-size:13px;padding:9px 16px}

/* hero */
.hero{position:relative;padding:76px 0 84px;overflow:hidden;
  background:radial-gradient(900px 600px at 78% 42%,rgba(255,179,0,.13),transparent 62%),
             radial-gradient(700px 500px at 10% 100%,rgba(46,196,182,.07),transparent 60%),var(--night)}
.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(126,151,163,.22) 1px,transparent 1.4px);background-size:24px 24px;mask-image:linear-gradient(180deg,#000 40%,transparent);-webkit-mask-image:linear-gradient(180deg,#000 40%,transparent);pointer-events:none}
.hero .wrap{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.kicker{display:flex;align-items:center;gap:14px;font-family:var(--mono);font-size:13px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:var(--amber);margin:0 0 22px}
.kicker::before{content:"";width:40px;height:2px;background:var(--amber)}
h1,h2,h3{font-family:var(--display);font-weight:400;line-height:.92;letter-spacing:.01em;text-transform:uppercase;margin:0}
.hero h1{font-size:clamp(56px,7.6vw,116px)}
.hero h1 .line{white-space:nowrap}
.hero h1 .line{display:block}
.hero h1 .amb{color:var(--amber);position:relative;display:inline-block}
.hero h1 .amb::after{content:"";position:absolute;left:0;right:0;bottom:-.06em;height:.07em;background:linear-gradient(90deg,var(--amber),var(--lamp));transform-origin:left}
.lede{font-size:clamp(17px,1.45vw,19.5px);color:#D9D2C1;max-width:640px;margin:30px 0 0}
.lede strong{color:var(--paper)}
.ctas{display:flex;flex-wrap:wrap;gap:16px;margin-top:34px}
.oss-tag{margin-top:22px;font-family:var(--mono);font-size:12.5px;color:var(--steel);letter-spacing:.06em}
.oss-tag b{color:var(--teal);font-weight:600}

/* hero mark + readout */
.hero-mark{position:relative;display:flex;flex-direction:column;align-items:center}
.pa-replay{all:unset;cursor:pointer;display:block;width:100%;max-width:470px;position:relative}
.pa-replay svg{display:block;width:100%;height:auto;overflow:visible}
.pa-replay .rp{position:absolute;right:4%;bottom:6%;font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--steel);border:1px solid var(--cable);padding:4px 9px;background:rgba(7,19,24,.7);transition:color .15s,border-color .15s}
.pa-replay:hover .rp,.pa-replay:focus-visible .rp{color:var(--amber);border-color:var(--amber)}
.readout{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 14px;margin:8px 0 0;padding:0;list-style:none;font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--steel)}
.readout li{display:flex;align-items:center;gap:7px}
.readout li::before{content:"";width:7px;height:7px;background:var(--amber)}
.readout li.ok{color:var(--teal)}
.readout li.ok::before{background:var(--teal)}

/* sections */
section{position:relative}
.band{padding:110px 0}
.band.alt{background:var(--frame)}
.band.paper{background:var(--paper);color:var(--night)}
.eyebrow{font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--amber);margin:0 0 16px}
.paper .eyebrow{color:var(--amberdeep)}
h2{font-size:clamp(42px,6vw,84px);max-width:16ch}
h2 .amb{color:var(--amber)}
.paper h2 .amb{color:var(--amberdeep)}
.intro{font-size:19px;max-width:720px;color:#D3CCBC;margin:26px 0 0}
.paper .intro{color:#2A3A41}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:56px}
.card{background:rgba(7,19,24,.55);border:1px solid rgba(126,151,163,.2);padding:28px 26px 26px;position:relative}
.card::before{content:"";position:absolute;left:-1px;top:-1px;width:44px;height:3px;background:var(--amber)}
.card h3{font-size:26px;line-height:1;margin:0 0 12px}
.card p{margin:0;color:#CFC8B8;font-size:15.5px}
.quote{margin:64px 0 0;padding:30px 34px;border-left:4px solid var(--amber);background:rgba(255,179,0,.06);max-width:860px}
.quote p{font-size:20px;line-height:1.5;margin:0;color:var(--paper)}
.quote cite{display:block;margin-top:14px;font-style:normal;font-family:var(--mono);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--steel)}

/* heritage timeline */
.timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:0;margin-top:60px;border-top:2px solid var(--night);position:relative}
.timeline li{list-style:none;padding:22px 18px 0 0;position:relative}
.timeline li::before{content:"";position:absolute;top:-7px;left:0;width:12px;height:12px;background:var(--amberdeep)}
.timeline li:last-child::before{background:var(--lamp)}
.timeline b{display:block;font-family:var(--display);font-weight:400;font-size:44px;line-height:1}
.timeline span{display:block;font-size:14.5px;line-height:1.5;margin-top:8px;color:#2A3A41}
.timeline ol{margin:0;padding:0;display:contents}
.fine{font-size:13px;color:#4B5A60;margin-top:34px;max-width:900px}

/* features */
.feat{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:rgba(126,151,163,.2);border:1px solid rgba(126,151,163,.2);margin-top:56px}
.feat article{background:var(--night);padding:30px 26px}
.feat .tag{font-family:var(--mono);font-size:12px;color:var(--amber);letter-spacing:.08em}
.feat h3{font-size:25px;line-height:1.02;margin:10px 0 12px}
.feat p{margin:0;font-size:15.5px;color:#CFC8B8}
.feat code{color:var(--amber);font-size:.92em}

/* code demo */
.demo{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:56px}
.term{background:#04090C;border:1px solid var(--cable);font-family:var(--mono);font-size:14px;line-height:1.65;overflow:hidden}
.term .bar{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--cable);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--steel)}
.term .bar i{width:9px;height:9px;background:var(--cable);display:inline-block}
.term .bar i:first-child{background:var(--amber)}
.term pre{margin:0;padding:18px 20px;overflow-x:auto;white-space:pre;color:#E6DFCC}
.k{color:var(--amber);font-weight:600}
.c{color:#6F8793}
.s{color:#9FE3D9}
.p{color:var(--teal)}
.e{color:var(--lamp)}
.term .note{border-top:1px solid var(--cable);padding:12px 20px;font-family:var(--body);font-size:13.5px;color:var(--steel)}

/* quick start */
.steps{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:56px;counter-reset:s}
.step{counter-increment:s;border:1px solid rgba(126,151,163,.22);background:rgba(7,19,24,.5);padding:26px 24px}
.step h3{font-size:24px;display:flex;align-items:baseline;gap:12px;margin-bottom:14px}
.step h3::before{content:"0" counter(s);font-family:var(--mono);font-size:13px;color:var(--amber);letter-spacing:.1em}
.step p{margin:0 0 12px;font-size:15px;color:#CFC8B8}
.step pre{margin:0;background:#04090C;border:1px solid var(--cable);padding:14px 16px;overflow-x:auto;font-size:13.5px;line-height:1.7;color:#E6DFCC}
.req{margin:30px 0 0;font-size:15px;color:#CFC8B8}
.req code{color:var(--amber)}

/* open source */
.oss{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start}
.freedoms{list-style:none;padding:0;margin:34px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.freedoms li{border:1px solid rgba(7,19,24,.18);padding:16px 18px;font-size:15px;background:rgba(255,255,255,.35)}
.freedoms b{display:block;font-family:var(--display);font-weight:400;font-size:24px;text-transform:uppercase;line-height:1;margin-bottom:6px}
.lic{background:var(--night);color:var(--paper);padding:30px 28px;clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%)}
.lic h3{font-size:30px;margin-bottom:12px}
.lic p{font-size:15px;color:#CFC8B8;margin:0 0 14px}
.lic ul{margin:0 0 22px;padding-left:18px;font-size:15px;color:#CFC8B8}
.lic li{margin:4px 0}
.lic code{color:var(--amber)}
.paper .btn.ghost{color:var(--night)!important;border-color:var(--night)}
.paper .btn.ghost:hover{background:var(--night);color:var(--paper)!important}

/* bsi */
.bsi{background:radial-gradient(800px 500px at 85% 20%,rgba(255,107,26,.14),transparent 60%),var(--frame);padding:120px 0}
.bsi .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.svc{list-style:none;padding:0;margin:0;display:grid;gap:12px}
.svc li{display:flex;gap:14px;align-items:flex-start;padding:16px 18px;border:1px solid rgba(126,151,163,.22);background:rgba(7,19,24,.5);font-size:15.5px;color:#D3CCBC}
.svc li::before{content:"->";font-family:var(--mono);font-weight:600;color:var(--amber);flex:none}
.svc b{color:var(--paper)}

/* footer */
footer{border-top:1px solid rgba(126,151,163,.18);padding:46px 0 54px;font-size:13.5px;color:var(--steel)}
footer .wrap{display:grid;grid-template-columns:auto 1fr;gap:34px;align-items:start}
footer img{width:220px;height:auto}
footer p{margin:0 0 8px}
footer a{color:var(--paper)}
footer nav{display:flex;flex-wrap:wrap;gap:8px 22px;margin-bottom:14px}
footer nav a{text-decoration:none;font-size:12.5px;letter-spacing:.1em;text-transform:uppercase}
footer nav a:hover{color:var(--amber)}

/* responsive */
@media (max-width:1060px){.nav .hide-md{display:none}}
@media (max-width:900px){
  .hero{padding:48px 0 64px}
  .hero .wrap,.oss,.bsi .wrap,.demo{grid-template-columns:1fr}
  .hero-mark{order:-1;max-width:330px;margin:0 auto}
  .grid3,.feat{grid-template-columns:1fr 1fr}
  .timeline{grid-template-columns:1fr 1fr 1fr;row-gap:30px}
  .steps{grid-template-columns:1fr}
  .band,.bsi{padding:80px 0}
}
@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding:0 20px}
  .nav ul li:not(.keep){display:none}
  .brand small{display:none}
  .grid3,.feat,.freedoms{grid-template-columns:1fr}
  .timeline{grid-template-columns:1fr 1fr}
  .hero h1{font-size:clamp(50px,15.5vw,80px)}
  .hero-mark{max-width:270px}
  .term{font-size:12.5px}
  footer .wrap{grid-template-columns:1fr}
  .ctas .btn{flex:1 1 auto;justify-content:center}
}
.steps>*,.demo>*,.feat>*,.grid3>*,.oss>*,.bsi .wrap>*,.hero .wrap>*{min-width:0}
.feat code,.card code,.svc code{white-space:nowrap}
.timeline{padding:0;margin-left:0}
.btn.ghost{clip-path:none}
.bsi h2{font-size:clamp(40px,4.8vw,68px)}