*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#ffffff;
  --bg-alt:#f5f7fa;
  --ink:#141a22;
  --ink-soft:#5b6673;
  --line:#e2e7ee;
  --brand:#1f6feb;
  --brand-dark:#1857bd;
  --dark:#101720;
  --radius:14px;
  --wrap:1140px;
}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.2;margin:0 0 .5em;letter-spacing:-.02em}
h1{font-size:clamp(1.9rem,4vw,3rem);font-weight:800}
h2{font-size:clamp(1.5rem,2.6vw,2.1rem);font-weight:750}
h3{font-size:1.12rem;font-weight:700}
p{margin:0 0 1rem}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 22px}
.wrap-narrow{max-width:820px}
.section{padding:78px 0}
.section-alt{background:var(--bg-alt);border-block:1px solid var(--line)}
.eyebrow{
  margin:0 0 .6rem;font-size:.78rem;font-weight:700;letter-spacing:.13em;
  text-transform:uppercase;color:var(--brand);
}
.section-lead{max-width:64ch;color:var(--ink-soft);font-size:1.05rem}
.note{margin-top:26px;color:var(--ink-soft);font-size:.92rem}

/* buttons */
.btn{
  display:inline-block;padding:13px 24px;border:1px solid var(--brand);border-radius:10px;
  background:var(--brand);color:#fff;font-weight:650;font-size:.97rem;cursor:pointer;
  transition:background .15s,border-color .15s,color .15s;
}
.btn:hover{background:var(--brand-dark);border-color:var(--brand-dark);text-decoration:none}
.btn-ghost{background:transparent;color:var(--brand)}
.btn-ghost:hover{background:rgba(31,111,235,.08);color:var(--brand-dark)}
.btn-sm{padding:9px 17px;font-size:.9rem}
.btn-full{display:block;width:100%;text-align:center}

/* header */
.site-header{
  position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:28px;min-height:68px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);font-size:1.15rem;font-weight:650}
.logo:hover{text-decoration:none}
.logo b{font-weight:800}
.nav{display:flex;gap:24px;margin-left:auto;font-size:.95rem}
.nav a{color:var(--ink-soft)}
.nav a:hover{color:var(--ink);text-decoration:none}

/* hero */
.hero{padding:74px 0 66px;background:linear-gradient(180deg,#f7f9fc,#fff)}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:52px;align-items:center}
.lead{font-size:1.1rem;color:var(--ink-soft);max-width:56ch}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 34px}
.hero-facts{display:flex;flex-wrap:wrap;gap:34px;margin:0;padding:26px 0 0;list-style:none;border-top:1px solid var(--line)}
.hero-facts li{display:flex;flex-direction:column}
.hero-facts b{font-size:1.5rem;font-weight:800;letter-spacing:-.02em}
.hero-facts span{font-size:.88rem;color:var(--ink-soft)}

/* Четыре независимых окна камер */
.cam-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.cam{
  position:relative;aspect-ratio:16/9;border-radius:12px;overflow:hidden;
  background:var(--dark);box-shadow:0 10px 26px rgba(16,23,32,.18);
}
.cam video{width:100%;height:100%;object-fit:cover;display:block}
.cam-label{
  position:absolute;left:9px;bottom:8px;padding:2px 7px;border-radius:4px;
  background:rgba(16,23,32,.55);color:rgba(255,255,255,.92);
  font-size:.7rem;letter-spacing:.04em;font-variant-numeric:tabular-nums;
}
.rec{position:absolute;right:9px;top:9px;width:8px;height:8px;border-radius:50%;background:#ff4d4f;box-shadow:0 0 0 3px rgba(16,23,32,.35);animation:blink 2s infinite}
.cam:nth-child(2) .rec{animation-delay:.5s}
.cam:nth-child(3) .rec{animation-delay:1s}
.cam:nth-child(4) .rec{animation-delay:1.5s}
@keyframes blink{0%,45%{opacity:1}50%,95%{opacity:.15}100%{opacity:1}}
@media (prefers-reduced-motion:reduce){.rec{animation:none}}

/* strip */
.strip{background:var(--dark);color:#fff;padding:30px 0}
.strip-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.strip-item{display:flex;gap:12px;align-items:flex-start}
.strip-item b{display:block;font-size:.97rem;font-weight:650}
.strip-item span{font-size:.85rem;color:rgba(255,255,255,.6);line-height:1.5}
.ico{width:24px;height:24px;flex:none;margin-top:2px;fill:none;stroke:var(--brand);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.ico .ck{stroke:#fff}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.card{
  padding:26px 24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  transition:border-color .15s,box-shadow .15s,transform .15s;
}
.card:hover{border-color:#c8d5ea;box-shadow:0 12px 28px rgba(20,26,34,.07);transform:translateY(-2px)}
.card p{margin:0;color:var(--ink-soft);font-size:.95rem}

/* pricing */
.prices{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px;align-items:start}
.price{position:relative;padding:30px 26px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.price-featured{border-color:var(--brand);box-shadow:0 14px 34px rgba(31,111,235,.14)}
.badge{
  position:absolute;top:-12px;left:26px;padding:4px 12px;border-radius:20px;
  background:var(--brand);color:#fff;font-size:.74rem;font-weight:650;letter-spacing:.02em;
}
.price-val{font-size:1.7rem;font-weight:800;letter-spacing:-.02em;margin:0 0 18px}
.price ul{margin:0 0 22px;padding:0;list-style:none;font-size:.94rem;color:var(--ink-soft)}
.price li{position:relative;padding:0 0 0 25px;margin-bottom:9px}
.price li::before{
  content:"";position:absolute;left:2px;top:.5em;width:11px;height:6px;
  border-left:2px solid var(--brand);border-bottom:2px solid var(--brand);transform:rotate(-45deg);
}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin:36px 0 0;padding:0;list-style:none;counter-reset:s}
.steps li{padding-top:8px;border-top:2px solid var(--line)}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;
  margin-bottom:12px;border-radius:50%;background:var(--brand);color:#fff;font-size:.9rem;font-weight:700;
}
.steps p{margin:0;color:var(--ink-soft);font-size:.94rem}

/* faq */
.faq{margin-top:32px;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{
  padding:18px 34px 18px 0;position:relative;cursor:pointer;font-weight:650;list-style:none;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";position:absolute;right:6px;top:24px;width:9px;height:9px;
  border-right:2px solid var(--ink-soft);border-bottom:2px solid var(--ink-soft);
  transform:rotate(45deg);transition:transform .2s;
}
.faq details[open] summary::after{transform:rotate(-135deg);top:28px}
.faq details p{margin:0 0 18px;color:var(--ink-soft);font-size:.96rem;max-width:70ch}

/* contacts */
.contacts-inner{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start}
.contact-list{margin:28px 0 0;display:grid;gap:14px}
.contact-list div{display:grid;grid-template-columns:150px 1fr;gap:12px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.contact-list dt{color:var(--ink-soft);font-size:.92rem}
.contact-list dd{margin:0;font-weight:600}
.form{padding:28px;background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius)}
.field{margin-bottom:16px}
.field label{display:block;margin-bottom:6px;font-size:.9rem;font-weight:600}
.field input,.field textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:9px;
  background:#fff;color:var(--ink);font:inherit;font-size:.96rem;resize:vertical;
}
.field input:focus,.field textarea:focus{outline:2px solid rgba(31,111,235,.35);outline-offset:1px;border-color:var(--brand)}
.field .invalid{border-color:#e5484d}
.form-note{margin:12px 0 0;font-size:.8rem;color:var(--ink-soft);line-height:1.5}
.form-done{margin:0;font-weight:600;color:#1a7f45}

/* footer */
.site-footer{background:var(--dark);color:rgba(255,255,255,.62);padding:44px 0;font-size:.92rem}
.footer-inner{display:grid;grid-template-columns:1.4fr 1fr auto;gap:30px;align-items:start}
.logo-footer{color:#fff;font-size:1.05rem;margin-bottom:10px}
.footer-note{margin:0;max-width:38ch}
.footer-nav{display:grid;gap:8px}
.footer-nav a{color:rgba(255,255,255,.62)}
.footer-nav a:hover{color:#fff;text-decoration:none}
.copy{margin:0;white-space:nowrap}

/* responsive */
@media (max-width:980px){
  .hero-inner,.contacts-inner{grid-template-columns:1fr;gap:38px}
  .cards,.prices,.steps{grid-template-columns:repeat(2,1fr)}
  .strip-inner{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr 1fr}
  .cam-grid{max-width:620px}
  /* меню уезжает во вторую строку шапки и скроллится вбок */
  .header-inner{flex-wrap:wrap;gap:14px;padding-top:12px}
  .header-inner .btn-sm{margin-left:auto;order:2}
  .nav{order:3;width:100%;margin-left:0;gap:20px;padding-bottom:10px;overflow-x:auto;scrollbar-width:none}
  .nav::-webkit-scrollbar{display:none}
  .nav a{white-space:nowrap}
}
@media (max-width:620px){
  .section{padding:56px 0}
  .hero{padding:48px 0 44px}
  .cards,.prices,.steps,.strip-inner,.footer-inner{grid-template-columns:1fr}
  .hero-facts{gap:22px}
  .contact-list div{grid-template-columns:1fr;gap:2px}
  .btn:not(.btn-sm){width:100%;text-align:center}
  .hero-actions{gap:10px}
}