/* Prototype A — "Clean Corporate": близко к оригиналу Tilda, без его балласта */
:root{
  --cyan:#03c4ef; --cyan-soft:#42d3f0; --ink:#111111; --muted:#5b6770;
  --bg:#ffffff; --bg-alt:#f8f9f9; --line:#e6ebee; --maxw:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--cyan);text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* header */
.hdr{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
.hdr__in{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:74px}
.hdr__logo img{width:170px}
.nav{display:flex;align-items:center;gap:26px;list-style:none;margin:0;padding:0}
.nav a{color:var(--ink);font-size:13px;letter-spacing:.08em;text-transform:uppercase;font-weight:600}
.nav a:hover{color:var(--cyan)}
.nav__sub{position:relative}
.nav__sub>a::after{content:"▾";margin-left:6px;font-size:10px;color:var(--muted)}
.nav__sub ul{display:none;position:absolute;left:-16px;top:100%;background:#fff;border:1px solid var(--line);
  box-shadow:0 10px 30px rgba(0,0,0,.08);list-style:none;margin:0;padding:8px 0;min-width:240px}
.nav__sub:hover ul,.nav__sub:focus-within ul{display:block}
.nav__sub ul a{display:block;padding:9px 20px;text-transform:none;letter-spacing:0;font-size:14px;font-weight:500}
.burger{display:none;background:none;border:0;font-size:24px;cursor:pointer;color:var(--ink)}

/* hero — светлая фотография, поэтому текст тёмный;
   слева лежит белая вуаль, чтобы контраст не зависел от кадрирования */
.hero{position:relative;background:#e8f2f9;overflow:hidden}
.hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:78% center}
.hero::after{content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(100deg,rgba(255,255,255,.94) 0%,rgba(255,255,255,.88) 38%,rgba(255,255,255,.42) 62%,rgba(255,255,255,0) 82%)}
.hero__in{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;
  padding:120px 24px 112px;text-align:left}
.hero__txt{max-width:720px}
.hero h1{font-size:clamp(46px,7.4vw,84px);font-weight:300;letter-spacing:.01em;margin:0 0 24px;
  color:#0a2b3d;text-shadow:0 1px 0 rgba(255,255,255,.65)}
.hero h1 sup{font-size:.34em;vertical-align:super;color:var(--cyan)}
.hero p{font-size:clamp(15px,1.55vw,19px);letter-spacing:.045em;text-transform:uppercase;
  line-height:1.75;margin:0;color:#173d52;font-weight:500}
.hero__rule{width:64px;height:3px;background:var(--cyan);margin:0 0 26px}

/* sections */
section{padding:84px 0}
.alt{background:var(--bg-alt)}
h2{font-size:clamp(26px,3.4vw,38px);font-weight:400;letter-spacing:.06em;text-transform:uppercase;margin:0 0 34px;text-align:center}
h2 sup{font-size:.4em;vertical-align:super}
.lead p{margin:0 0 20px;text-align:justify;color:#22303a}
.lead{max-width:900px;margin:0 auto}

/* cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.card{background:#fff;border-radius:16px;padding:34px 28px;text-align:center;
  box-shadow:1px 1px 1px 0 var(--cyan);transition:box-shadow .15s ease-out}
.card:hover{box-shadow:4px 4px 4px 0 var(--cyan)}
.card img{width:150px;margin:0 auto 22px;border-radius:8px}
.card p{margin:0;font-size:16px;color:#22303a}

/* two columns */
.cols{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.box{background:#fff;border-radius:16px;padding:40px;box-shadow:1px 1px 1px 0 var(--cyan);transition:box-shadow .15s ease-out}
.box:hover{box-shadow:4px 4px 4px 0 var(--cyan)}
.box h3{margin:0 0 18px;font-size:20px;letter-spacing:.1em;text-transform:uppercase;font-weight:600;color:var(--cyan)}
.box p{margin:0;text-align:justify;color:#22303a}

/* footer */
.ftr{background:#111;color:#cfd8dd;padding:56px 0 34px;font-size:15px}
.ftr__in{display:flex;flex-wrap:wrap;gap:30px;justify-content:space-between}
.ftr a{color:var(--cyan-soft)}
.ftr__cr{margin-top:34px;padding-top:20px;border-top:1px solid #262626;font-size:13px;color:#8d989e}

@media(max-width:980px){
  .burger{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:74px;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:flex-start;gap:0;padding:10px 24px 20px}
  .nav.open{display:flex}
  .nav>li{width:100%;padding:10px 0}
  .nav__sub ul{display:block;position:static;border:0;box-shadow:none;padding:6px 0 0 14px}
  .cards,.cols{grid-template-columns:1fr}
  section{padding:56px 0}
  /* на узком экране кадр обрезается по центру — вуаль делаем сплошной */
  .hero img{object-position:62% center}
  .hero::after{background:linear-gradient(180deg,rgba(255,255,255,.93),rgba(255,255,255,.86) 70%,rgba(255,255,255,.78))}
  .hero__in{padding:72px 24px 66px}
}