/* ==== STAL TREST — Premium industrial minimalism ==== */
:root{
  --st-bg:#ffffff;
  --st-ink:#0B1220;
  --st-steel:#1E2A44;
  --st-steel-2:#2C3E5C;
  --st-line:#E5E9F0;
  --st-muted:#6B7280;
  --st-accent:#C9A55C;
  --st-glass:rgba(30,42,68,.06);
  --st-radius:18px;
  --st-shadow:0 20px 60px -20px rgba(11,18,32,.18);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--st-bg);color:var(--st-ink);font-family:'Inter',system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased;line-height:1.5}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none;padding:0;margin:0}
button{font-family:inherit;cursor:pointer;border:none;background:none}

.st-container{max-width:1240px;margin:0 auto;padding:0 24px}
.st-section{padding:110px 0;position:relative}
.st-bg-soft{background:#F6F8FB}
.st-bg-dark{background:var(--st-ink);color:#fff}

.st-eyebrow{display:inline-block;font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--st-accent);font-weight:700;margin-bottom:14px}
.st-eyebrow--accent{color:var(--st-accent)}
.st-h1{font-size:clamp(34px,5vw,62px);line-height:1.05;font-weight:800;letter-spacing:-.02em;margin:0}
.st-h2{font-size:clamp(28px,3.4vw,44px);line-height:1.1;font-weight:800;letter-spacing:-.015em;margin:0}
.st-h2--light{color:#fff}
.st-lead{font-size:clamp(16px,1.15vw,19px);color:var(--st-muted);line-height:1.65;max-width:720px;margin:0}
.st-bg-dark .st-lead{color:#B8C0CE}
.st-mt-md{margin-top:18px}
.st-section__head{max-width:820px;margin-bottom:56px}

/* Buttons */
.st-btn{display:inline-flex;align-items:center;gap:10px;padding:15px 26px;border-radius:999px;font-weight:600;font-size:15px;transition:.25s;border:1px solid transparent;cursor:pointer;white-space:nowrap}
.st-btn-primary{background:var(--st-steel);color:#fff}
.st-btn-primary:hover{background:var(--st-ink);transform:translateY(-1px)}
.st-btn-accent{background:var(--st-accent);color:#0B1220}
.st-btn-accent:hover{filter:brightness(1.05);transform:translateY(-1px)}
.st-btn-ghost{background:#fff;color:var(--st-ink);border-color:var(--st-line)}
.st-btn-ghost:hover{border-color:var(--st-steel);color:var(--st-steel)}

/* Cards */
.st-card{background:#fff;border:1px solid var(--st-line);border-radius:var(--st-radius);padding:28px;transition:.35s}
.st-card:hover{transform:translateY(-4px);box-shadow:var(--st-shadow);border-color:transparent}
.st-card b{display:block;font-size:16px}
.st-card p{color:var(--st-muted);margin:8px 0 0;font-size:15px;line-height:1.6}
.st-card h3{margin:10px 0;font-size:20px;font-weight:700}
.st-card--dark{background:var(--st-steel);color:#fff;border:none}
.st-card--dark p{color:#B8C0CE}
.st-card--dark:hover{background:var(--st-ink);transform:translateY(-4px)}

.st-glass{background:var(--st-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.35);padding:16px;border-radius:14px}
.st-glass b{display:block;font-size:22px;font-weight:800;color:var(--st-ink)}
.st-glass span{display:block;color:var(--st-muted);font-size:13px;margin-top:4px}

/* Reveal on scroll */
.st-reveal{opacity:0;transform:translateY(24px);transition:opacity .8s ease,transform .8s ease}
.st-reveal.is-in{opacity:1;transform:none}

/* Grids */
.st-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.st-grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

/* ---- HEADER ---- */
.st-header{position:sticky;top:0;background:rgba(255,255,255,.85);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);z-index:100;border-bottom:1px solid var(--st-line)}
.st-header__inner{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;gap:20px}
.st-logo{display:flex;align-items:center;gap:12px}
.st-logo__mark{width:44px;height:44px;border-radius:12px;background:var(--st-steel);color:#fff;font-weight:800;display:grid;place-items:center;font-size:16px}
.st-logo__mark--accent{background:var(--st-accent);color:#0B1220}
.st-logo__text b{display:block;font-size:14px;font-weight:700}
.st-logo__text small{display:block;color:var(--st-accent);font-size:12px;font-weight:600;margin-top:2px}
.st-logo--light .st-logo__text b{color:#fff}
.st-nav{display:flex;gap:24px}
.st-nav a{font-size:14px;font-weight:500;color:var(--st-ink);transition:.2s}
.st-nav a:hover{color:var(--st-accent)}
.st-header__cta{padding:11px 22px;font-size:14px}
.st-burger{display:none;flex-direction:column;gap:5px;padding:8px}
.st-burger span{width:26px;height:2px;background:var(--st-ink);border-radius:2px;transition:.3s}

/* ---- HERO ---- */
.st-hero{padding-top:90px;padding-bottom:80px;background:linear-gradient(180deg,#F6F8FB 0%,#fff 100%);overflow:hidden}
.st-hero__grid{display:grid;grid-template-columns:1.15fr .85fr;gap:60px;align-items:center}
.st-hero__actions{margin-top:34px;display:flex;flex-wrap:wrap;gap:12px}
.st-hero__stats{margin-top:44px;display:grid;grid-template-columns:repeat(3,1fr);gap:14px;max-width:560px}
.st-hero__img{position:relative;border-radius:24px;overflow:hidden;box-shadow:var(--st-shadow);aspect-ratio:4/5}
.st-hero__img img{width:100%;height:100%;object-fit:cover}
.st-hero__badge{position:absolute;left:20px;right:20px;bottom:20px;padding:20px;border-radius:16px;background:rgba(11,18,32,.6);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);color:#fff;border:1px solid rgba(255,255,255,.15)}
.st-hero__badge-label{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--st-accent);font-weight:700}
.st-hero__badge-text{font-size:22px;font-weight:700;margin-top:6px}

/* ---- SELLING BLOCK ---- */
.st-selling{padding-top:20px}
.st-selling__card{padding:44px;border-radius:24px;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;background:var(--st-steel);color:#fff}
.st-selling__card p{margin:0;font-size:19px;line-height:1.65}
.st-selling__slogan{margin-top:22px;font-size:22px;font-weight:700;color:var(--st-accent)}
.st-selling__points{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.st-selling__points>div{padding:18px;border:1px solid rgba(255,255,255,.14);border-radius:14px;font-size:14px}

/* ---- Values ---- */
.st-values{margin-top:20px}

/* ---- Slogan block ---- */
.st-slogan-block{margin-top:70px;padding:70px 40px;border-radius:24px;background:var(--st-ink);color:#fff;text-align:center}
.st-slogan-block__text{font-size:clamp(30px,4.2vw,54px);font-weight:800;letter-spacing:-.02em;margin-top:10px;line-height:1.1}
.st-slogan-block p{color:#B8C0CE;max-width:640px;margin:18px auto 0}

/* ---- Requisites ---- */
.st-requisites{margin-top:50px;border:1px solid var(--st-line);border-radius:var(--st-radius);padding:22px 26px}
.st-requisites summary{cursor:pointer;font-weight:700;font-size:18px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.st-requisites summary::-webkit-details-marker{display:none}
.st-requisites__toggle{color:var(--st-accent);font-size:22px;transition:.3s}
.st-requisites[open] .st-requisites__toggle{transform:rotate(45deg)}
.st-requisites__grid{margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:14px 30px;font-size:15px;line-height:1.75}
.st-requisites__grid .st-full{grid-column:1/-1}

/* ---- Services ---- */
.st-services{margin-top:20px}
.st-num{font-size:12px;color:var(--st-accent);font-weight:800;letter-spacing:.2em}
.st-num--accent{color:var(--st-accent)}
.st-services__wide{grid-column:1/-1;display:grid;grid-template-columns:1fr auto;align-items:center;gap:30px}
.st-services__wide h3{margin:10px 0 6px;font-size:24px}
.st-services__wide p{margin:0}

/* ---- Why ---- */
.st-icon{font-size:28px}

/* ---- Process ---- */
.st-process{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.st-step{padding:26px;border:1px solid rgba(255,255,255,.12);border-radius:16px}
.st-step__num{font-size:34px;font-weight:800;color:var(--st-accent)}
.st-step b{display:block;margin-top:10px;font-weight:700}
.st-step p{color:#B8C0CE;font-size:14px;margin:6px 0 0}

/* ---- Gallery ---- */
.st-gallery{display:grid;grid-template-columns:repeat(6,1fr);grid-auto-rows:180px;gap:14px}
.st-gallery__item{border-radius:18px;overflow:hidden;position:relative;cursor:pointer;transition:.4s}
.st-gallery__item img{width:100%;height:100%;object-fit:cover;transition:.6s}
.st-gallery__item:hover img{transform:scale(1.05)}
.st-gallery__item::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 60%,rgba(11,18,32,.55));opacity:0;transition:.3s}
.st-gallery__item:hover::after{opacity:1}
.st-gallery__item--wide{grid-column:span 3;grid-row:span 2}
.st-gallery__item:not(.st-gallery__item--wide){grid-column:span 2}

/* ---- Request form ---- */
.st-request{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start}
.st-request__contacts{margin-top:30px;display:grid;gap:14px;max-width:420px}
.st-request__contacts .st-card{padding:18px}
.st-request__label{display:block;color:var(--st-muted);font-size:13px;margin-bottom:4px}
.st-request__contacts a{font-weight:700;font-size:17px;color:var(--st-ink)}

.st-form{padding:36px}
.st-form label{display:block;font-weight:600;font-size:14px;margin-bottom:14px}
.st-form input,.st-form textarea{width:100%;padding:14px 16px;border:1px solid var(--st-line);border-radius:12px;font-size:15px;font-family:inherit;background:#fff;margin-top:6px;transition:.2s;color:var(--st-ink)}
.st-form input:focus,.st-form textarea:focus{outline:none;border-color:var(--st-steel);box-shadow:0 0 0 4px rgba(30,42,68,.08)}
.st-form textarea{min-height:130px;resize:vertical}
.st-form__submit{width:100%;margin-top:8px;justify-content:center}
.st-form__note{font-size:12px;color:var(--st-muted);margin-top:14px;text-align:center}
.st-form__msg{margin-top:16px;padding:14px;border-radius:12px;font-size:14px;display:none}
.st-form__msg.is-success{display:block;background:#E7F5EC;color:#0B6B32;border:1px solid #B7E1C4}
.st-form__msg.is-error{display:block;background:#FDECEC;color:#8B1F1F;border:1px solid #F1BFBF}
.st-form__msg.is-loading{display:block;background:#F0F3F8;color:var(--st-steel);border:1px solid var(--st-line)}

/* ---- Contacts ---- */
.st-contacts{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.st-contacts__buttons{margin-top:30px;display:grid;gap:12px;max-width:460px}
.st-contacts__buttons .st-btn{justify-content:center}
.st-contacts__card{padding:32px}
.st-contacts__card b{font-size:18px}
.st-contacts__info{margin-top:16px;line-height:1.75;font-size:15px}
.st-contacts__info>div{margin-top:12px}
.st-contacts__info>div:first-child{margin-top:0}

/* ---- Footer ---- */
.st-footer{background:var(--st-ink);color:#B8C0CE;padding:70px 0 30px}
.st-footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.st-footer__slogan{margin-top:16px;color:var(--st-accent);font-weight:700;font-size:17px}
.st-footer p{margin-top:12px;font-size:14px;line-height:1.6}
.st-footer b{display:block;color:#fff;margin-bottom:14px}
.st-footer ul{display:grid;gap:8px;font-size:14px}
.st-footer a{color:#B8C0CE;transition:.2s}
.st-footer a:hover{color:var(--st-accent)}
.st-footer__requisites{font-size:13px;line-height:1.7}
.st-footer__bottom{margin-top:50px;padding-top:24px;border-top:1px solid rgba(255,255,255,.08);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px}

/* ---- Lightbox ---- */
.st-lightbox{position:fixed;inset:0;background:rgba(11,18,32,.92);display:none;align-items:center;justify-content:center;z-index:200;padding:40px;cursor:zoom-out}
.st-lightbox.is-open{display:flex}
.st-lightbox img{max-width:90vw;max-height:80vh;border-radius:12px;box-shadow:0 30px 90px rgba(0,0,0,.5)}
.st-lightbox__close{position:absolute;top:20px;right:30px;color:#fff;font-size:44px;cursor:pointer;line-height:1}
.st-lightbox__title{position:absolute;bottom:30px;left:0;right:0;text-align:center;color:#fff;font-size:15px;opacity:.85}

/* ---- Responsive ---- */
@media(max-width:1024px){
  .st-nav{display:none}
  .st-burger{display:flex}
  .st-header__cta{display:none}
  .st-hero__grid{grid-template-columns:1fr}
  .st-hero__img{max-width:500px;margin:0 auto}
  .st-selling__card{grid-template-columns:1fr;padding:32px}
  .st-grid-4{grid-template-columns:repeat(2,1fr)}
  .st-process{grid-template-columns:repeat(3,1fr)}
  .st-request,.st-contacts{grid-template-columns:1fr}
  .st-footer__grid{grid-template-columns:1fr 1fr}
  .st-gallery{grid-template-columns:repeat(4,1fr);grid-auto-rows:150px}
  .st-gallery__item--wide{grid-column:span 4;grid-row:span 2}
  .st-gallery__item:not(.st-gallery__item--wide){grid-column:span 2}
  .st-services__wide{grid-template-columns:1fr;text-align:left}
}
@media(max-width:640px){
  .st-section{padding:70px 0}
  .st-container{padding:0 18px}
  .st-hero{padding-top:60px}
  .st-hero__stats{grid-template-columns:1fr}
  .st-grid-3,.st-grid-4{grid-template-columns:1fr}
  .st-process{grid-template-columns:1fr}
  .st-requisites__grid{grid-template-columns:1fr}
  .st-selling__points{grid-template-columns:1fr}
  .st-footer__grid{grid-template-columns:1fr;gap:30px}
  .st-slogan-block{padding:40px 24px}
  .st-gallery{grid-template-columns:1fr 1fr}
  .st-gallery__item--wide{grid-column:span 2;grid-row:span 1}
  .st-gallery__item:not(.st-gallery__item--wide){grid-column:span 1}
  .st-nav.is-open{display:flex;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:20px;gap:16px;border-bottom:1px solid var(--st-line);box-shadow:var(--st-shadow)}
}