/* =========================================================================
   Red Horizon Technologies — site styles
   Copper on graphite. Industrial/datasheet voice: Saira display, IBM Plex body,
   IBM Plex Mono for spec lines only. Sharper corners than the sibling sites.
   Signature: the stacked rack/edge-unit module in the hero. Built on Bootstrap 5.
   ========================================================================= */

:root{
  --graphite:#16191E;
  --surface:#1B2026;
  --elevated:#222932;
  --copper:#C77B3C;
  --copper-bright:#DB9152;
  --text:#D7DEE6;
  --head:#FFFFFF;
  --muted:#8A95A1;
  --faint:#5C6670;
  --line:rgba(201,209,217,.12);
  --line-copper:rgba(199,123,60,.38);
  --azure:#0075FA;
  --maxw:1180px;
  --r:7px;
  --font-display:'Saira',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --font-body:'IBM Plex Sans',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  background:var(--graphite);
  color:var(--text);
  font-family:var(--font-body);
  font-size:1.0625rem;
  line-height:1.7;
  margin:0;
  -webkit-font-smoothing:antialiased;
}
.container{max-width:var(--maxw);}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.1;letter-spacing:-.01em;color:var(--head);}
h1{font-weight:700;}
h2{font-size:clamp(1.7rem,3vw,2.5rem);}
h3{font-size:1.2rem;}
p{margin:0 0 1rem;}
a{color:var(--copper-bright);text-decoration:none;transition:color .15s ease;}
a:hover{color:var(--copper);}

/* ---- Skip link & focus ---- */
.skip-link{position:absolute;left:-9999px;top:0;background:var(--copper);color:#1b1206;padding:.6rem 1rem;border-radius:0 0 6px 0;font-weight:600;z-index:200;}
.skip-link:focus{left:0;}
:focus-visible{outline:2px solid var(--copper);outline-offset:3px;border-radius:3px;}

/* ---- Eyebrow (copper square + Saira caps) ---- */
.eyebrow{
  font-family:var(--font-display);font-weight:600;font-size:.76rem;
  letter-spacing:.2em;text-transform:uppercase;color:var(--copper);
  display:inline-flex;align-items:center;gap:.6rem;
}
.eyebrow::before{content:"";width:9px;height:9px;background:var(--copper);}

/* ---- Datasheet spec line (mono, copper) ---- */
.spec{
  display:inline-block;font-family:var(--font-mono);font-size:.78rem;letter-spacing:.02em;
  color:var(--copper-bright);background:rgba(199,123,60,.08);border:1px solid var(--line-copper);
  border-radius:5px;padding:.35rem .6rem;
}

.lead-muted{color:var(--muted);font-size:1.125rem;max-width:54ch;}

/* ---- Buttons (sharp) ---- */
.btn-cu{
  display:inline-block;background:var(--copper);color:#1b1206;font-weight:600;
  border:0;border-radius:6px;padding:.7rem 1.45rem;font-family:var(--font-body);
  line-height:1.2;cursor:pointer;transition:background .15s ease,transform .15s ease;
}
.btn-cu:hover{background:var(--copper-bright);color:#1b1206;transform:translateY(-1px);}
.btn-ghost-cu{
  display:inline-block;background:transparent;color:var(--text);
  border:1px solid var(--line);border-radius:6px;padding:.7rem 1.45rem;line-height:1.2;font-weight:500;
  transition:border-color .15s ease,color .15s ease;
}
.btn-ghost-cu:hover{border-color:var(--copper);color:var(--copper);}

/* ---- Header / nav ---- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(22,25,30,.82);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:border-color .2s ease;}
.site-header.is-scrolled{border-bottom-color:var(--line);}
.navbar{padding:.8rem 0;}
.brand-word{font-family:var(--font-display);font-weight:700;font-size:1.12rem;color:var(--head);letter-spacing:-.01em;line-height:1;display:inline-flex;align-items:baseline;gap:.4rem;}
.brand-sub{font-weight:600;font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;color:var(--copper);}
.site-nav .nav-link{color:var(--text);font-size:.96rem;padding:.4rem .9rem;border-radius:6px;transition:color .15s ease;}
.site-nav .nav-link:hover{color:var(--copper);}
.site-nav .nav-link[aria-current="page"]{color:var(--copper);}
.navbar-toggler{border-color:var(--line);}
.navbar-toggler:focus{box-shadow:0 0 0 3px rgba(199,123,60,.3);}
.dropdown-menu{--bs-dropdown-bg:#1B2026;--bs-dropdown-border-color:var(--line);--bs-dropdown-link-color:var(--muted);--bs-dropdown-link-hover-bg:rgba(199,123,60,.08);--bs-dropdown-link-hover-color:var(--copper);border-radius:8px;padding:.4rem;}
.dropdown-item{border-radius:5px;font-size:.95rem;}

/* ---- Sections ---- */
.section{padding:clamp(3.5rem,8vw,6.5rem) 0;}
.section--surface{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:62ch;}
.section-head h2{margin-top:.7rem;}

/* ---- Hero + rack signature ---- */
.hero{position:relative;overflow:hidden;padding:clamp(4.5rem,12vw,8rem) 0 clamp(3rem,7vw,5rem);}
.hero__bg{
  position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:48px 48px;opacity:.6;
  -webkit-mask-image:radial-gradient(ellipse 80% 75% at 78% 35%,#000 35%,transparent 76%);
          mask-image:radial-gradient(ellipse 80% 75% at 78% 35%,#000 35%,transparent 76%);
}
.hero__rack{position:absolute;right:2%;top:50%;transform:translateY(-50%);width:min(38%,380px);z-index:0;opacity:.92;pointer-events:none;}
.hero__content{position:relative;z-index:1;}
.hero h1{font-size:clamp(2.3rem,5vw,3.9rem);max-width:18ch;}
.hero .accent{color:var(--copper);}
.unit-body{fill:#222932;stroke:var(--line-copper);stroke-width:1.4;}
.unit-vent{stroke:var(--faint);stroke-width:1.4;opacity:.6;}
.unit-led-a{fill:var(--copper-bright);}
.unit-led-b{fill:var(--copper);}

/* ---- Category cards ---- */
.cat{
  position:relative;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r);padding:1.6rem;height:100%;transition:border-color .18s ease,transform .18s ease,background .18s ease;
}
.cat:hover{border-color:var(--line-copper);transform:translateY(-3px);background:var(--elevated);}
.cat .ico{width:42px;height:42px;border-radius:6px;display:flex;align-items:center;justify-content:center;background:rgba(199,123,60,.12);color:var(--copper-bright);font-size:1.25rem;margin-bottom:1rem;}
.cat h3{margin:0 0 .5rem;}
.cat p{color:var(--muted);font-size:.98rem;margin:0 0 1rem;}

/* ---- Why reasons ---- */
.reason{border-top:1px solid var(--line);padding:1.25rem 0;}
.reason:first-child{border-top:0;}
.reason h3{font-size:1.1rem;margin:0 0 .35rem;}
.reason p{color:var(--muted);font-size:.98rem;margin:0;}

/* ---- Products page rows ---- */
.prod-row{border-top:1px solid var(--line);padding:clamp(2rem,5vw,3rem) 0;}
.prod-row:first-of-type{border-top:0;padding-top:.5rem;}
.prod-row .ico{width:46px;height:46px;border-radius:6px;display:flex;align-items:center;justify-content:center;background:rgba(199,123,60,.12);color:var(--copper-bright);font-size:1.4rem;}
.prod-row h2{margin:.2rem 0 .6rem;}

/* ---- Forms ---- */
.form-label{font-family:var(--font-display);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:.45rem;display:block;font-weight:600;}
.form-control{background:var(--surface);border:1px solid var(--line);color:var(--text);border-radius:6px;padding:.72rem .9rem;font-size:1rem;}
.form-control:focus{background:var(--surface);border-color:var(--copper);box-shadow:0 0 0 3px rgba(199,123,60,.18);color:var(--text);}
.form-control::placeholder{color:var(--faint);}
.honeypot{position:absolute !important;left:-9999px !important;width:1px;height:1px;overflow:hidden;}

/* ---- Banners ---- */
.banner{border-radius:8px;padding:.9rem 1.1rem;border:1px solid var(--line);margin-bottom:1.6rem;font-size:.98rem;}
.banner--ok{border-color:rgba(199,123,60,.45);background:rgba(199,123,60,.09);color:var(--text);}
.banner--err{border-color:rgba(255,120,120,.45);background:rgba(255,120,120,.08);color:#ffd9d9;}

/* ---- Footer ---- */
.site-footer{background:#101317;border-top:1px solid var(--line);padding:3.5rem 0 2rem;}
.footer-tag{color:var(--muted);max-width:34ch;font-size:.95rem;}
.footer-head{font-family:var(--font-display);font-weight:600;font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--faint);margin-bottom:.9rem;}
.footer-list{list-style:none;padding:0;margin:0;}
.footer-list li{margin-bottom:.5rem;}
.footer-list a{color:var(--muted);font-size:.95rem;}
.footer-list a:hover{color:var(--copper);}
.footer-bottom{border-top:1px solid var(--line);margin-top:2.5rem;padding-top:1.5rem;}
.footer-mark{display:inline-flex;align-items:center;gap:.55rem;font-size:.85rem;color:var(--faint);}
.footer-mark .dot{width:9px;height:9px;border-radius:50%;background:var(--azure);}
.footer-mark:hover{color:var(--text);}
.footer-copy{color:var(--faint);font-size:.85rem;}

/* ---- Responsive ---- */
@media (max-width:991.98px){
  .hero__rack{opacity:.32;right:-6%;width:60%;}
  .navbar-collapse{padding-top:.75rem;}
}

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important;}
}