:root{
  --bg:#EDF0EF; --surface:#FFFFFF; --ink:#16232C; --muted:#4F5F69; --line:#CBD3D6;
  --panel:#16232C; --panel-text:#E8EEF0; --ready:#2E9E5B; --alert:#C8372D; --accent:#1F5F7A;
  --display:'Bricolage Grotesque','Arial Narrow',Arial,sans-serif;
  --body:'IBM Plex Sans',system-ui,-apple-system,'Segoe UI',Arial,sans-serif;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0F1A21; --surface:#17242D; --ink:#E8EEF0; --muted:#9DB0BA; --line:#2B3C47;
    --panel:#0A1217; --panel-text:#E8EEF0; --accent:#6DB7D3; --ready:#3FBF73; --alert:#F0594D;
  }
}
:root[data-theme="dark"]{
  --bg:#0F1A21; --surface:#17242D; --ink:#E8EEF0; --muted:#9DB0BA; --line:#2B3C47;
  --panel:#0A1217; --panel-text:#E8EEF0; --accent:#6DB7D3; --ready:#3FBF73; --alert:#F0594D;
}
*{box-sizing:border-box}
:root{padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
html{scroll-padding-top:env(safe-area-inset-top,0px);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.05rem/1.6 var(--body)}
a{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.wrap{max-width:1080px;margin:0 auto;padding:0 1.25rem}
h1,h2,h3{font-family:var(--display);line-height:1.08;margin:0 0 .6em;letter-spacing:-.01em}
h1{font-size:clamp(2.4rem,6vw,4rem);font-weight:800}
h2{font-size:clamp(1.8rem,4vw,2.6rem);font-weight:800}
h3{font-size:1.3rem;font-weight:500}
p{margin:0 0 1em;max-width:62ch}
header.top{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:1rem 0;flex-wrap:wrap}
.brand{font-family:var(--display);font-weight:800;font-size:1.3rem;text-decoration:none;color:var(--ink)}
nav a{margin-left:1.25rem;color:var(--ink);text-decoration:none;font-weight:500}
nav a:hover{text-decoration:underline}
.btn{display:inline-block;background:var(--ink);color:var(--bg);padding:.85rem 1.4rem;border-radius:4px;font-weight:600;text-decoration:none;border:0;cursor:pointer;font:600 1rem var(--body)}
.btn:hover{background:var(--accent);color:#fff}
.btn.alt{background:transparent;color:var(--ink);border:2px solid var(--ink)}
.btn.alt:hover{background:var(--ink);color:var(--bg)}
/* hero */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:3rem;align-items:center;padding:3rem 0 4.5rem}
.hero .lead{font-size:1.2rem;color:var(--muted)}
.cta{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.5rem}
.keypad{background:var(--panel);color:var(--panel-text);border-radius:14px;padding:1.4rem;box-shadow:0 18px 40px rgba(10,18,23,.28);max-width:380px;justify-self:end;width:100%}
.screen{background:#0A1217;border:1px solid #2B3C47;border-radius:6px;padding:1rem;font-family:var(--display);min-height:7.5rem}
.screen .state{font-size:1.5rem;font-weight:800}
.screen .sub{font-family:var(--body);font-size:.95rem;color:#9DB0BA;margin-top:.4rem}
.leds{display:flex;gap:1.1rem;margin:1rem 0;font-size:.9rem}
.led{display:flex;align-items:center;gap:.45rem}
.led i{width:12px;height:12px;border-radius:50%;background:#33434D;display:inline-block}
.keypad[data-armed="false"] .led.ready i{background:var(--ready);box-shadow:0 0 8px var(--ready)}
.keypad[data-armed="true"] .led.armed i{background:var(--alert);box-shadow:0 0 8px var(--alert)}
.keypad button{width:100%;margin-top:.4rem;background:#E8EEF0;color:#16232C;border:0;border-radius:6px;padding:.8rem;font:600 1rem var(--body);cursor:pointer}
.keypad button:hover{background:#fff}
.hint{font-size:.85rem;color:#9DB0BA;margin:.7rem 0 0}
/* sections */
section{padding:4rem 0;border-top:1px solid var(--line)}
.reasons{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;margin-top:2rem}
.reasons h3{border-top:4px solid var(--alert);padding-top:.8rem}
.reasons p{color:var(--muted)}
.steps{list-style:none;padding:0;margin:2rem 0 0;counter-reset:s}
.steps li{counter-increment:s;display:grid;grid-template-columns:3rem 1fr;gap:1rem;padding:1.2rem 0;border-bottom:1px solid var(--line)}
.steps li::before{content:counter(s);font:800 2rem var(--display);color:var(--accent)}
.steps h3{margin:0 0 .2em}
.steps p{margin:0;color:var(--muted)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-top:2rem}
.box{background:var(--surface);border:1px solid var(--line);padding:1.6rem;border-radius:6px}
.box ul{padding-left:1.1rem;margin:0}
.box li{margin-bottom:.45rem}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;margin-top:2rem}
.dsc{background:var(--panel);color:var(--panel-text);border-radius:10px;padding:2rem;margin-top:2rem}
.dsc p{color:#B9C8CF}
.dsc ul{columns:2;padding-left:1.1rem;margin:0}
.dsc li{margin-bottom:.4rem}
details{border-bottom:1px solid var(--line);padding:1rem 0}
summary{cursor:pointer;font-weight:600;font-size:1.1rem}
details p{margin:.7rem 0 0;color:var(--muted)}
/* contact */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:3rem}
label{display:block;font-weight:600;margin:0 0 .9rem}
input,select,textarea{display:block;width:100%;margin-top:.3rem;padding:.7rem;border:1px solid var(--line);border-radius:4px;background:var(--surface);color:var(--ink);font:inherit}
footer{padding:2rem 0 3rem;border-top:1px solid var(--line);color:var(--muted);font-size:.95rem}
@media (max-width:820px){
  .hero,.reasons,.two,.three,.contact{grid-template-columns:1fr}
  .keypad{justify-self:start}
  .dsc ul{columns:1}
  nav a{margin:0 1rem 0 0}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

nav a[aria-current="page"]{text-decoration:underline;text-underline-offset:6px;text-decoration-thickness:2px}
main>section:first-child{border-top:0;padding-top:2rem}
h1.ph{font-size:clamp(1.8rem,4vw,2.6rem)}
.band{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.5rem}
/* header that hides on scroll down and returns on scroll up */
header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--bg);transition:transform .25s ease,box-shadow .25s ease;border-bottom:1px solid transparent}
header.top.scrolled{border-bottom-color:var(--line)}
header.top.hide{transform:translateY(calc(-100% - env(safe-area-inset-top,0px)))}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);background:var(--bg);z-index:30}
html{scroll-padding-top:calc(5.5rem + env(safe-area-inset-top,0px))}
@media (prefers-reduced-motion:reduce){header.top{transition:none}}