/* SOLID DEVELOPMENT GROUP — v1 */
*,*::before,*::after{box-sizing:border-box}
:root{
  --ink:#07090c; --ink2:#0d1116; --ink3:#141a21;
  --fg:#e9eef4; --muted:#93a0ad; --line:rgba(255,255,255,.10);
  --blue:#1f86ff; --blue2:#0b4fd0; --blue-soft:rgba(31,134,255,.14);
  --chrome:linear-gradient(140deg,#fff 0%,#c6ced8 32%,#7c8794 58%,#eef2f6 100%);
  --pad:clamp(20px,5vw,40px); --maxw:1240px;
  --r:14px;
}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ink);color:var(--fg);
  font:400 16px/1.65 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
body.lock{overflow:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:Archivo,Inter,sans-serif;font-stretch:125%;font-weight:700;letter-spacing:0;margin:0 0 .5em;line-height:1.06}
h1{font-size:clamp(42px,8.4vw,92px);font-weight:800;letter-spacing:-.035em}
h2{font-size:clamp(28px,4.6vw,50px)}
h3{font-size:clamp(24px,3.4vw,36px)}
h4{font-size:19px;letter-spacing:-.01em}
p{margin:0 0 1em}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.eyebrow{font-family:Archivo,sans-serif;font-stretch:125%;font-weight:600;font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--blue);margin:0 0 14px}
section{padding:clamp(64px,10vw,128px) 0;position:relative}

/* reveal */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ── INTRO ── */
.intro{position:fixed;inset:0;z-index:200;background:var(--ink);display:grid;place-items:center;
  transition:opacity .7s ease,visibility .7s}
.intro.gone{opacity:0;visibility:hidden;pointer-events:none}
.intro::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(60% 50% at 50% 45%,rgba(31,134,255,.16),transparent 70%)}
.intro__inner{text-align:center;position:relative;z-index:1;padding:0 24px}
.intro__logo{width:clamp(260px,48vw,560px);margin:0 auto;
  animation:markIn 1.3s cubic-bezier(.16,1,.3,1) both}
.intro__logo img{width:100%;height:auto;display:block;
  }
@keyframes markIn{from{opacity:0;transform:translateY(30px) scale(.9)}to{opacity:1;transform:none}}
.intro__bar{width:min(240px,54vw);height:2px;background:var(--line);margin:30px auto 0;overflow:hidden;border-radius:2px}
.intro__bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue2),var(--blue));
  animation:barGo 1.5s .3s cubic-bezier(.5,0,.2,1) both}
@keyframes barGo{to{width:100%}}
.intro__skip{position:absolute;right:20px;bottom:20px;z-index:2;background:none;border:1px solid var(--line);
  color:var(--muted);font:500 12px/1 Inter,sans-serif;letter-spacing:.12em;text-transform:uppercase;
  padding:10px 16px;border-radius:99px;cursor:pointer}
.intro__skip:hover{color:#fff;border-color:rgba(255,255,255,.4)}

/* ── HEADER ── */
.hdr{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .35s,border-color .35s,backdrop-filter .35s;
  border-bottom:1px solid transparent}
.hdr.solid{background:rgba(7,9,12,.86);backdrop-filter:blur(14px);border-bottom-color:var(--line)}
.hdr__in{display:flex;align-items:center;justify-content:space-between;gap:20px;height:74px}
.brand{display:flex;align-items:center;gap:11px;flex:0 0 auto}
.brand__mark{height:34px;width:auto;flex:0 0 auto}
.brand__txt{display:flex;flex-direction:column;line-height:1}
.brand__txt b{font-family:Archivo,sans-serif;font-stretch:125%;font-weight:800;font-size:19px;letter-spacing:.08em;
  background:var(--chrome);-webkit-background-clip:text;background-clip:text;color:transparent}
.brand__txt i{font-style:normal;font-family:Archivo,sans-serif;font-stretch:125%;font-weight:600;font-size:8.5px;
  letter-spacing:.26em;color:var(--blue);margin-top:3px}
.nav{display:flex;align-items:center;gap:28px}
.nav a{font-size:14.5px;color:var(--muted);transition:color .2s;white-space:nowrap}
.nav a:hover{color:#fff}
.nav__cta{border:1px solid var(--blue);color:#fff!important;padding:10px 18px;border-radius:99px;
  font-weight:500;background:var(--blue-soft);transition:background .25s}
.nav__cta:hover{background:var(--blue)}
.burger{display:none;background:none;border:0;padding:10px;cursor:pointer}
.burger i{display:block;width:24px;height:2px;background:#fff;margin:5px 0;transition:transform .3s,opacity .3s}
.burger[aria-expanded=true] i:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded=true] i:nth-child(2){opacity:0}
.burger[aria-expanded=true] i:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ── HERO ── */
.hero{min-height:100svh;display:flex;align-items:center;padding:120px 0 90px;overflow:hidden}
.hero__bg{position:absolute;inset:0}
.hero__slide{position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:0;transition:opacity 1.6s ease;transform:scale(1.06)}
.hero__slide.is-on{opacity:1;animation:kb 12s linear both}

/* фоны hero: webp как фолбэк, avif подхватывается через image-set */
.hs1{background-image:url(../assets/projects/education-1920.webp);
  background-image:image-set(url(../assets/projects/education-1920.avif) type("image/avif"),
                             url(../assets/projects/education-1920.webp) type("image/webp"))}
.hs2{background-image:url(../assets/projects/industrial-1920.webp);
  background-image:image-set(url(../assets/projects/industrial-1920.avif) type("image/avif"),
                             url(../assets/projects/industrial-1920.webp) type("image/webp"))}
.hs3{background-image:url(../assets/projects/aquatics-1920.webp);
  background-image:image-set(url(../assets/projects/aquatics-1920.avif) type("image/avif"),
                             url(../assets/projects/aquatics-1920.webp) type("image/webp"))}
.hs4{background-image:url(../assets/projects/business-center-1920.webp);
  background-image:image-set(url(../assets/projects/business-center-1920.avif) type("image/avif"),
                             url(../assets/projects/business-center-1920.webp) type("image/webp"))}
@media (max-width:1440px){
  .hs1{background-image:url(../assets/projects/education-1440.webp);
    background-image:image-set(url(../assets/projects/education-1440.avif) type("image/avif"),
                               url(../assets/projects/education-1440.webp) type("image/webp"))}
  .hs2{background-image:url(../assets/projects/industrial-1440.webp);
    background-image:image-set(url(../assets/projects/industrial-1440.avif) type("image/avif"),
                               url(../assets/projects/industrial-1440.webp) type("image/webp"))}
  .hs3{background-image:url(../assets/projects/aquatics-1440.webp);
    background-image:image-set(url(../assets/projects/aquatics-1440.avif) type("image/avif"),
                               url(../assets/projects/aquatics-1440.webp) type("image/webp"))}
  .hs4{background-image:url(../assets/projects/business-center-1440.webp);
    background-image:image-set(url(../assets/projects/business-center-1440.avif) type("image/avif"),
                               url(../assets/projects/business-center-1440.webp) type("image/webp"))}
}
@media (max-width:1000px){
  .hs1{background-image:url(../assets/projects/education-1280.webp);
    background-image:image-set(url(../assets/projects/education-1280.avif) type("image/avif"),
                               url(../assets/projects/education-1280.webp) type("image/webp"))}
  .hs2{background-image:url(../assets/projects/industrial-1280.webp);
    background-image:image-set(url(../assets/projects/industrial-1280.avif) type("image/avif"),
                               url(../assets/projects/industrial-1280.webp) type("image/webp"))}
  .hs3{background-image:url(../assets/projects/aquatics-1280.webp);
    background-image:image-set(url(../assets/projects/aquatics-1280.avif) type("image/avif"),
                               url(../assets/projects/aquatics-1280.webp) type("image/webp"))}
  .hs4{background-image:url(../assets/projects/business-center-1280.webp);
    background-image:image-set(url(../assets/projects/business-center-1280.avif) type("image/avif"),
                               url(../assets/projects/business-center-1280.webp) type("image/webp"))}
}
@keyframes kb{from{transform:scale(1.03)}to{transform:scale(1.14)}}
.hero__veil{position:absolute;inset:0;
  background:linear-gradient(105deg,rgba(7,9,12,.96) 0%,rgba(7,9,12,.86) 42%,rgba(7,9,12,.5) 100%),
             linear-gradient(0deg,var(--ink) 2%,transparent 40%)}
.hero__in{position:relative;z-index:2;max-width:960px}
.hero__lead{font-size:clamp(15px,2vw,18.5px);color:var(--muted);max-width:600px;margin-top:18px}
.hero__cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.hero__scroll{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);z-index:2;
  width:26px;height:42px;border:1px solid var(--line);border-radius:99px;display:grid;place-items:start center;padding-top:8px}
.hero__scroll i{width:3px;height:8px;background:var(--blue);border-radius:2px;animation:sc 1.8s infinite}
@keyframes sc{0%{opacity:0;transform:translateY(0)}30%{opacity:1}100%{opacity:0;transform:translateY(16px)}}

/* ── BUTTONS ── */
.btn{display:inline-flex;flex-direction:column;gap:3px;padding:15px 26px;border-radius:var(--r);
  font-family:Archivo,sans-serif;font-stretch:125%;font-weight:600;font-size:16px;letter-spacing:.01em;
  border:1px solid var(--line);transition:transform .25s,background .25s,border-color .25s;position:relative;overflow:hidden}
.btn span{font-family:Inter,sans-serif;font-weight:400;font-size:12.5px;color:rgba(255,255,255,.6);letter-spacing:0}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:linear-gradient(135deg,var(--blue2),var(--blue));border-color:transparent;color:#fff}
.btn--primary:hover{background:linear-gradient(135deg,var(--blue),#4ea6ff)}
.btn--ghost{background:rgba(255,255,255,.05);backdrop-filter:blur(6px)}
.btn--ghost:hover{border-color:rgba(255,255,255,.35);background:rgba(255,255,255,.1)}
.btn--full{width:100%;align-items:center;cursor:pointer;font-size:15px}

/* ── STATS ── */
.stats{padding:0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--ink2)}
.stats__grid{display:grid;grid-template-columns:repeat(4,1fr)}
.stat{padding:clamp(28px,4vw,44px) clamp(16px,2.4vw,30px);border-left:1px solid var(--line)}
.stat:first-child{border-left:0}
.stat b{font-family:Archivo,sans-serif;font-stretch:125%;font-weight:800;font-size:clamp(30px,4vw,46px);line-height:1;
  background:var(--chrome);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-family:Archivo,sans-serif;font-stretch:125%;font-weight:800;font-size:clamp(24px,3vw,36px);color:var(--blue)}
.stat p{margin:10px 0 0;font-size:14px;color:var(--muted);line-height:1.5}

/* ── DIVISIONS ── */
.divs__tabs{display:inline-flex;gap:6px;padding:6px;border:1px solid var(--line);border-radius:99px;margin:8px 0 44px;background:var(--ink2)}
.dtab{background:none;border:0;color:var(--muted);cursor:pointer;padding:12px 30px;border-radius:99px;
  font-family:Archivo,sans-serif;font-stretch:125%;font-weight:600;font-size:15.5px;letter-spacing:.02em;transition:.25s}
.dtab.is-on{background:linear-gradient(135deg,var(--blue2),var(--blue));color:#fff}
.dpanel{display:none;grid-template-columns:1.05fr 1fr;gap:clamp(28px,5vw,64px);align-items:center}
.dpanel.is-on{display:grid;animation:fadeUp .55s cubic-bezier(.16,1,.3,1) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.dpanel__media{border-radius:var(--r);overflow:hidden;border:1px solid var(--line);position:relative}
.dpanel__media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(7,9,12,.55))}
.dpanel__media picture{display:block}
.dpanel__media img{width:100%;height:clamp(280px,44vw,470px);object-fit:cover}
.svc{list-style:none;padding:0;margin:24px 0 30px;display:grid;grid-template-columns:1fr 1fr;gap:1px;
  background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.svc li{background:var(--ink2);padding:14px 16px;font-size:14.2px;color:#cfd8e2;
  display:flex;align-items:center;gap:10px;transition:background .25s,color .25s}
.svc li::before{content:"";width:6px;height:6px;background:var(--blue);border-radius:2px;flex:0 0 auto;transform:rotate(45deg)}
.svc li:hover{background:var(--ink3);color:#fff}

/* ── VALUES ── */
.vals{background:var(--ink2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.vals__grid{display:grid;grid-template-columns:repeat(6,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-top:44px}
.val{background:var(--ink);padding:clamp(26px,3.4vw,40px);transition:background .3s;grid-column:span 2}
.val:nth-child(4),.val:nth-child(5){grid-column:span 3}
.val:hover{background:var(--ink3)}
.val span{font-family:Archivo,sans-serif;font-stretch:125%;font-weight:800;font-size:13px;letter-spacing:.2em;color:var(--blue);display:block;margin-bottom:16px}
.val p{margin:0;font-size:14.6px;color:var(--muted)}

/* ── PROJECTS ── */
.filters{display:flex;flex-wrap:wrap;gap:9px;margin:8px 0 40px}
.fbtn{background:var(--ink2);border:1px solid var(--line);color:var(--muted);cursor:pointer;
  padding:10px 18px;border-radius:99px;font:500 13.5px/1 Inter,sans-serif;transition:.25s}
.fbtn:hover{color:#fff;border-color:rgba(255,255,255,.3)}
.fbtn.is-on{background:var(--blue);border-color:var(--blue);color:#fff}
.pgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--ink2);
  position:relative;opacity:0;transform:translateY(20px);transition:opacity .5s,transform .5s,border-color .3s}
.card.in{opacity:1;transform:none}
.card:hover{border-color:rgba(31,134,255,.55)}
.card__img{position:relative;overflow:hidden;aspect-ratio:4/3}
.card__img picture{display:block;width:100%;height:100%}
.card__img img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.16,1,.3,1)}
.card:hover .card__img picture{display:block;width:100%;height:100%}
.card__img img{transform:scale(1.07)}
.card__tag{position:absolute;top:12px;left:12px;z-index:2;background:rgba(7,9,12,.75);backdrop-filter:blur(6px);
  border:1px solid var(--line);color:#dbe3ec;font:600 10.5px/1 Archivo,sans-serif;letter-spacing:.16em;
  text-transform:uppercase;padding:7px 11px;border-radius:99px}
.card__b{padding:20px 20px 22px}
.card__b h4{margin:0 0 8px}
.card__b p{margin:0;font-size:13.6px;color:var(--muted)}
.card__meta{margin-top:12px;padding-top:12px;border-top:1px solid var(--line);
  font:600 12px/1 Archivo,sans-serif;letter-spacing:.12em;text-transform:uppercase;color:var(--blue)}

/* ── PROCESS ── */
.proc__list{list-style:none;padding:0;margin:44px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.proc__list li{background:var(--ink2);padding:clamp(26px,3.2vw,38px);position:relative}
.proc__list b{font-family:Archivo,sans-serif;font-stretch:125%;font-weight:800;font-size:34px;color:transparent;
  -webkit-text-stroke:1px rgba(31,134,255,.55);display:block;margin-bottom:14px;line-height:1}
.proc__list p{margin:0;font-size:14.2px;color:var(--muted)}

/* ── CONTACT ── */
.cta{background:var(--ink2);border-top:1px solid var(--line)}
.cta__in{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,5vw,70px);align-items:start}
.cta__copy p{color:var(--muted);max-width:460px}
.cta__meta{list-style:none;padding:0;margin:32px 0 0;display:grid;gap:20px}
.cta__meta li{display:grid;gap:5px}
.cta__meta span{font:600 11px/1 Archivo,sans-serif;letter-spacing:.2em;text-transform:uppercase;color:var(--blue)}
.cta__meta a{font-size:15.5px;color:#dbe3ec;transition:color .2s}
.cta__meta a:hover{color:#fff}
.form{background:var(--ink);border:1px solid var(--line);border-radius:var(--r);padding:clamp(22px,3vw,34px);display:grid;gap:16px}
.form__row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form label{display:grid;gap:7px;font:600 11px/1 Archivo,sans-serif;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.form input,.form select,.form textarea{background:var(--ink2);border:1px solid var(--line);border-radius:10px;
  color:var(--fg);font:400 15px/1.4 Inter,sans-serif;padding:13px 14px;transition:border-color .2s,background .2s;width:100%}
.form textarea{resize:vertical;min-height:96px}
.form input:focus,.form select:focus,.form textarea:focus{outline:0;border-color:var(--blue);background:var(--ink3)}
.form input.err,.form textarea.err{border-color:#ff5c5c}
.form__note{margin:0;font:400 12.5px/1.5 Inter,sans-serif;letter-spacing:0;text-transform:none;color:var(--muted);text-align:center}
.form__note.ok{color:#49d17c}

/* ── FOOTER ── */
.ftr{background:var(--ink);border-top:1px solid var(--line);padding:44px 0}
.ftr__in{display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between}
.ftr__nav{display:flex;flex-wrap:wrap;gap:22px}
.ftr__nav a{font-size:14px;color:var(--muted)}
.ftr__nav a:hover{color:#fff}
.ftr__legal{margin:0;font-size:12.5px;color:#66707b;text-align:right;line-height:1.6}
.ftr__legal small{color:#4c555f}

/* ── RESPONSIVE ── */
@media (max-width:1000px){
  .pgrid,.proc__list{grid-template-columns:repeat(2,1fr)}
  .vals__grid{grid-template-columns:repeat(2,1fr)}
  .val,.val:nth-child(4),.val:nth-child(5){grid-column:span 1}
  .dpanel{grid-template-columns:1fr}
  .stats__grid{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(3){border-left:0}
  .stat:nth-child(n+3){border-top:1px solid var(--line)}
  .cta__in{grid-template-columns:1fr}
  .ftr__legal{text-align:left}
}
@media (max-width:760px){
  .burger{display:block}
  .nav{position:fixed;inset:74px 0 auto;flex-direction:column;align-items:stretch;gap:0;
    background:rgba(7,9,12,.98);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);
    padding:8px 0 22px;transform:translateY(-130%);transition:transform .4s cubic-bezier(.16,1,.3,1);visibility:hidden}
  .nav.open{transform:none;visibility:visible}
  .nav a{padding:16px var(--pad);border-bottom:1px solid var(--line);font-size:17px}
  .nav__cta{margin:16px var(--pad) 0;text-align:center;border-bottom:1px solid var(--blue)}
  .hdr.solid,.nav.open ~ .burger{}
  .pgrid,.vals__grid,.proc__list,.svc,.form__row{grid-template-columns:1fr}
  .val,.val:nth-child(4),.val:nth-child(5){grid-column:span 1}
  .hero{padding-top:104px}
  .hero__cta .btn{width:100%}
  .divs__tabs{width:100%;display:grid;grid-template-columns:1fr 1fr}
  .dtab{padding:13px 10px}
}
@media (max-width:420px){ .stats__grid{grid-template-columns:1fr} .stat{border-left:0;border-top:1px solid var(--line)} .stat:first-child{border-top:0} }
/* лого-локап и марка теперь в <picture> — обёртка не должна ломать раскладку */
.intro__logo picture,.brand picture,.foot__brand picture{display:block;line-height:0}