/* ===========================================================
   RTK Connections shared design system
   Master stylesheet for all pages. Matches index.html.
   =========================================================== */
:root{
  --bg:#0b1120;
  --bg-2:#0f172a;
  --surface:#162035;
  --surface-2:#1e2d45;
  --line:rgba(216,177,74,.20);
  --line-soft:rgba(200,220,255,.08);
  --gold:#f0a500;
  --gold-soft:#f5c842;
  --orange:#ef6a2b;
  --teal:#38bdf8;
  --paper:#f3efe6;
  --paper-2:#e8e1d2;
  --text:#f0f4ff;
  --muted:#a0b0cc;
  --ink:#1b1d18;
  --ink-muted:#5c6053;
  --font-display:"Archivo",sans-serif;
  --font-body:"Hanken Grotesk",sans-serif;
  --font-mono:"JetBrains Mono",monospace;
  --maxw:1180px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--text);font-family:var(--font-body);
  font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

.eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);display:inline-flex;align-items:center;gap:.7em;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold);opacity:.6}
.eyebrow.teal{color:var(--teal)}
.eyebrow.teal::before{background:var(--teal)}
h1,h2,h3{font-family:var(--font-display);line-height:1.05;letter-spacing:-.01em}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}

/* ===== Header ===== */
header{
  position:sticky;top:0;z-index:50;background:rgba(11,17,32,.88);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line);
}
.nav{
  max-width:var(--maxw);margin:0 auto;padding:18px 32px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{display:flex;align-items:center;gap:14px}
.brand .mark{width:42px;height:42px;flex:none}
.brand .word{display:flex;flex-direction:column;line-height:1}
.brand .word b{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:.14em;color:var(--gold)}
.brand .word span{font-family:var(--font-mono);font-size:8.5px;letter-spacing:.34em;color:var(--muted);margin-top:5px}
nav.menu{display:flex;align-items:center;gap:30px}
nav.menu a{font-size:14.5px;font-weight:500;color:var(--muted);transition:color .2s;position:relative}
nav.menu a:hover{color:var(--text)}
nav.menu a.active{color:var(--gold)}
nav.menu a.cta{color:var(--bg);background:var(--gold);padding:9px 18px;border-radius:2px;font-weight:600;transition:background .2s,transform .2s}
nav.menu a.cta:hover{background:var(--gold-soft);transform:translateY(-1px)}
.burger{display:none;background:none;border:1px solid var(--line);color:var(--gold);padding:8px 12px;border-radius:2px;font-family:var(--font-mono);font-size:12px;cursor:pointer}

/* ===== Page hero (sub-pages) ===== */
.phero{position:relative;overflow:hidden;padding:90px 0 70px;border-bottom:1px solid var(--line)}
.phero .rings{position:absolute;top:50%;right:-200px;transform:translateY(-50%);width:600px;height:600px;pointer-events:none;opacity:.4}
.phero-glow{position:absolute;top:50%;right:0;transform:translateY(-50%);width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(216,177,74,.10),transparent 62%);pointer-events:none}
.phero .wrap{position:relative;z-index:2}
.phero h1{font-size:clamp(34px,5vw,58px);font-weight:900;letter-spacing:-.025em;margin:20px 0 0;max-width:760px}
.phero h1 .accent{color:var(--gold)}
.phero .lede{font-size:clamp(16px,1.7vw,20px);color:#c8cabf;margin-top:22px;max-width:620px;line-height:1.55}
.phero .lede b{color:var(--text);font-weight:600}

/* ===== Section scaffolding ===== */
section{position:relative}
.band{padding:84px 0}
.band.tight{padding:64px 0}
.sec-head{max-width:680px;margin-bottom:46px}
.sec-head h2{font-size:clamp(28px,4vw,42px);font-weight:800;margin-top:16px}
.sec-head p{color:var(--muted);margin-top:16px;font-size:18px}
.alt{background:linear-gradient(180deg,var(--bg) 0%,var(--bg-2) 100%);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:10px;font-weight:600;font-size:15.5px;padding:14px 24px;border-radius:2px;transition:transform .2s,background .2s,border-color .2s}
.btn-primary{background:var(--gold);color:var(--bg)}
.btn-primary:hover{background:var(--gold-soft);transform:translateY(-2px)}
.btn-ghost{border:1px solid var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn .arr{transition:transform .2s}
.btn:hover .arr{transform:translateX(4px)}
.cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}

/* ===== Prose (manifesto / long reading) ===== */
.prose{max-width:720px}
.prose p{color:#c8cabf;font-size:18px;margin-bottom:22px;line-height:1.7}
.prose p b{color:var(--text);font-weight:600}
.prose .big{font-family:var(--font-display);font-weight:700;font-size:clamp(22px,3vw,30px);color:var(--text);line-height:1.25;margin-bottom:26px}
.prose .lead-gold{color:var(--gold)}

/* ===== Pillars ===== */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.pillars.two{grid-template-columns:repeat(2,1fr)}
.pillar{background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:32px 28px;position:relative;overflow:hidden;transition:transform .25s,border-color .25s}
.pillar::after{content:"";position:absolute;inset:0;border-radius:4px;background:radial-gradient(circle at 100% 0%,rgba(216,177,74,.10),transparent 55%);opacity:0;transition:opacity .3s}
.pillar:hover{transform:translateY(-5px);border-color:rgba(216,177,74,.4)}
.pillar:hover::after{opacity:1}
.pillar .ic{width:46px;height:46px;border-radius:3px;display:grid;place-items:center;background:var(--surface-2);border:1px solid var(--line);color:var(--gold);margin-bottom:20px}
.pillar .tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold)}
.pillar h3{font-size:20px;font-weight:800;margin:10px 0 10px}
.pillar p{color:var(--muted);font-size:15px}
.pillar .hl{color:var(--gold);font-weight:700}
.pillar ul{list-style:none;margin-top:18px;display:flex;flex-direction:column;gap:9px}
.pillar li{font-size:14.5px;color:#c2c5b9;padding-left:20px;position:relative}
.pillar li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border:1px solid var(--gold);transform:rotate(45deg)}

/* ===== Problem grid / numbered cells ===== */
.prob-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.prob-grid .cell{background:var(--bg);padding:30px 32px}
.prob-grid .cell .n{font-family:var(--font-mono);font-size:12px;color:var(--orange);letter-spacing:.1em}
.prob-grid .cell .n.gold{color:var(--gold)}
.prob-grid .cell h4{font-family:var(--font-display);font-weight:700;font-size:18px;margin:12px 0 8px}
.prob-grid .cell p{color:var(--muted);font-size:15.5px;line-height:1.55}

/* ===== Orange callout ===== */
.callout{border:1px solid rgba(239,106,43,.4);background:rgba(239,106,43,.06);border-radius:6px;padding:24px 28px;margin-bottom:34px}
.callout .n{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--orange)}
.callout p{margin-top:8px;font-size:16px;color:#d9d6cc}
.prob-head h2 .x{color:var(--orange)}
.checklist{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.checklist .cell{background:var(--bg);padding:26px 28px}
.checklist .cell .num{font-family:var(--font-mono);font-size:12px;color:var(--gold);letter-spacing:.1em}
.checklist .cell h4{font-family:var(--font-display);font-weight:700;font-size:17px;margin:10px 0 8px}
.checklist .cell p{color:var(--muted);font-size:15px;line-height:1.55}

/* ===== Stepper (transition path) ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;position:relative;border:1px solid var(--line);border-radius:4px;overflow:hidden}
.step{padding:36px 30px;position:relative;border-right:1px solid var(--line)}
.step:last-child{border-right:none}
.step .ph{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.step .badge{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;border:1px solid var(--gold);color:var(--gold);font-family:var(--font-mono);font-size:14px;margin-bottom:18px}
.step h4{font-family:var(--font-display);font-weight:800;font-size:21px;margin:6px 0 12px}
.step p{color:var(--muted);font-size:15px;line-height:1.55}
.step.end{background:var(--surface)}
.step.end .badge{background:var(--gold);color:var(--bg);border-color:var(--gold)}
.path-foot{margin-top:26px;font-family:var(--font-mono);font-size:13px;color:var(--muted);display:flex;align-items:center;gap:10px}
.path-foot b{color:var(--gold)}

/* ===== Explore cards ===== */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.card{display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--surface);border:1px solid var(--line);border-radius:4px;padding:30px 32px;transition:border-color .25s,background .25s}
.card:hover{border-color:rgba(216,177,74,.45);background:var(--surface-2)}
.card .num{font-family:var(--font-mono);font-size:12px;color:var(--gold);letter-spacing:.1em}
.card h3{font-size:24px;font-weight:800;margin:8px 0 6px}
.card p{color:var(--muted);font-size:14.5px;max-width:330px}
.card .go{font-size:26px;color:var(--gold);transition:transform .25s;flex:none}
.card:hover .go{transform:translate(4px,-4px)}

/* ===== Featured product ===== */
.product{display:grid;grid-template-columns:0.85fr 1fr;gap:40px;align-items:stretch}
.product-media{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:6px;min-height:420px;overflow:hidden}
.product-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center}
.product-media::after{content:"";position:absolute;inset:0;box-shadow:inset 0 0 90px rgba(14,16,13,.55);pointer-events:none}
.product-info{display:flex;flex-direction:column;justify-content:center}
.product-info .tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold)}
.product-info h2{font-size:clamp(26px,3.4vw,38px);font-weight:800;margin:12px 0 8px}
.product-info .sub{color:var(--muted);font-size:16px;max-width:460px}
.price{display:flex;align-items:baseline;gap:14px;margin:26px 0 8px}
.price .amt{font-family:var(--font-display);font-weight:900;font-size:46px;color:var(--gold);letter-spacing:-.02em}
.price .lbl{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.kit-list{list-style:none;margin:20px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:11px}
.kit-list li{font-size:14.5px;color:#c2c5b9;padding-left:22px;position:relative}
.kit-list li::before{content:"";position:absolute;left:0;top:8px;width:8px;height:8px;border:1px solid var(--gold);transform:rotate(45deg)}
.kit-list li b{color:var(--text);font-weight:600}

/* ===== Spec table ===== */
.specs{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.specs .group{background:var(--bg);padding:28px 30px}
.specs .group h4{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold);margin-bottom:16px}
.specs .row{display:flex;justify-content:space-between;gap:18px;padding:9px 0;border-bottom:1px solid var(--line-soft);font-size:14.5px}
.specs .row:last-child{border-bottom:none}
.specs .row span{color:var(--muted)}
.specs .row b{color:var(--text);font-weight:600;text-align:right}
.accuracy-fig{margin:0 auto 30px;max-width:560px;background:#000;border:1px solid var(--line);border-radius:6px;padding:18px 18px 8px}
.accuracy-fig img{width:100%}
.accuracy-fig figcaption{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--muted);text-align:center;padding:6px 0 8px}

/* ===== Catalog (future expansion) ===== */
.catalog{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.catcard{background:var(--surface);border:1px dashed var(--line);border-radius:6px;padding:28px 26px;min-height:170px;display:flex;flex-direction:column;justify-content:space-between}
.catcard.live{border-style:solid}
.catcard .tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.catcard h4{font-family:var(--font-display);font-weight:700;font-size:19px;margin:12px 0 6px;color:var(--text)}
.catcard p{color:var(--muted);font-size:14px}
.catcard .soon{font-family:var(--font-mono);font-size:11px;color:var(--gold);letter-spacing:.1em;margin-top:14px}

/* ===== Equipment table ===== */
.equip{border:1px solid var(--line);border-radius:6px;overflow:hidden}
.equip table{width:100%;border-collapse:collapse;font-size:14.5px}
.equip th{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);text-align:left;padding:16px 20px;background:var(--surface-2);border-bottom:1px solid var(--line)}
.equip td{padding:16px 20px;border-bottom:1px solid var(--line-soft);color:#c8cabf}
.equip tr:last-child td{border-bottom:none}
.equip tr:hover td{background:var(--surface)}
.equip td.name{color:var(--text);font-weight:600}
.equip td.price{font-family:var(--font-display);font-weight:800;color:var(--gold);white-space:nowrap}
.equip td.qty{font-family:var(--font-mono);color:var(--muted)}
.pill{display:inline-block;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;padding:3px 9px;border-radius:100px;border:1px solid var(--line)}
.pill.new{color:var(--teal);border-color:rgba(95,179,166,.4)}
.pill.demo{color:var(--gold);border-color:rgba(216,177,74,.4)}
.pill.used{color:var(--muted)}
.equip-note{font-family:var(--font-mono);font-size:12.5px;color:var(--muted);margin-top:18px}

/* ===== Contact form ===== */
.form-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:start}
.field{margin-bottom:18px}
.field label{display:block;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.field input,.field textarea,.field select{
  width:100%;background:var(--surface);border:1px solid var(--line);border-radius:3px;
  color:var(--text);font-family:var(--font-body);font-size:15.5px;padding:13px 15px;transition:border-color .2s;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--gold)}
.field textarea{min-height:130px;resize:vertical}
.contact-aside{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:32px 30px}
.contact-aside h3{font-size:20px;font-weight:800;margin-bottom:16px}
.contact-aside .row{display:flex;flex-direction:column;gap:4px;margin-bottom:20px}
.contact-aside .row .k{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.contact-aside .row .v{font-size:16px}
.contact-aside .row .v a{color:var(--gold)}

/* ===== CTA contact band ===== */
.contact{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.contact .wrap{display:flex;flex-wrap:wrap;gap:40px;justify-content:space-between;align-items:center;position:relative;z-index:2}
.contact h2{font-size:clamp(26px,3.6vw,40px);font-weight:800;max-width:560px}
.contact .who{font-family:var(--font-mono);font-size:14px;color:var(--muted);margin-top:18px;line-height:1.9}
.contact .who a{color:var(--gold)}
.contact .ring2{position:absolute;right:-140px;top:50%;transform:translateY(-50%);width:420px;opacity:.4;pointer-events:none}

/* ===== Footer ===== */
footer{background:var(--bg);padding:46px 0 40px}
footer .wrap{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between;align-items:center}
footer .fnav{display:flex;flex-wrap:wrap;gap:24px}
footer .fnav a{font-size:14px;color:var(--muted);transition:color .2s}
footer .fnav a:hover{color:var(--gold)}
footer .copy{font-family:var(--font-mono);font-size:12px;color:var(--ink-muted)}

/* ===== reveal ===== */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ===== responsive ===== */
@media(max-width:880px){
  nav.menu{display:none}
  .burger{display:block}
  .pillars,.pillars.two,.steps,.cards,.prob-grid,.specs,.checklist,.catalog,.product,.form-grid{grid-template-columns:1fr}
  .step{border-right:none;border-bottom:1px solid var(--line)}
  .step:last-child{border-bottom:none}
  .band{padding:60px 0}
  .product-media{min-height:300px}
  .equip{overflow-x:auto}
}
@media(max-width:520px){
  .wrap,.nav{padding-left:20px;padding-right:20px}
  .kit-list{grid-template-columns:1fr}
}