/* ============================================================
   ProAnticor — лендинг антикоррозийной обработки
   Палитра взята с логотипа: графит, сталь, красный акцент
   ============================================================ */

:root{
  --bg:#0b0c0e;
  --bg-2:#101216;
  --surface:#15181d;
  --surface-2:#1b1f26;
  --line:rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.16);

  --red:#e01b26;
  --red-2:#b1131c;
  --steel:#c8ced6;
  --text:#eef1f5;
  --muted:#949ba6;

  --radius:14px;
  --radius-lg:20px;
  --maxw:1180px;
  --pad:clamp(20px,4vw,40px);

  --ff:'Manrope',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
  --ff-head:'Oswald','Manrope',system-ui,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--ff);
  /* аудитория 35+ — базовый кегль крупнее обычного */
  font-size:18px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}

h1,h2,h3{font-family:var(--ff-head);font-weight:600;line-height:1.1;letter-spacing:.01em;margin:0}
h1{font-size:clamp(30px,3.4vw,46px);text-transform:uppercase}
h2{font-size:clamp(27px,3.8vw,44px);text-transform:uppercase}
h3{font-size:clamp(19px,2vw,22px)}
p{margin:0}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding-inline:var(--pad)}
.container--narrow{max-width:860px}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--red);color:#fff;padding:12px 20px;z-index:200}
.skip-link:focus{left:0}

:focus-visible{outline:2px solid var(--red);outline-offset:3px}

/* ---------- Кнопки ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:16px 30px;border:1px solid transparent;border-radius:10px;
  font-weight:700;font-size:16px;letter-spacing:.02em;
  transition:transform .18s ease,background .18s ease,border-color .18s ease,box-shadow .18s ease;
  text-align:center;
}
.btn--primary{
  background:linear-gradient(180deg,var(--red),var(--red-2));
  color:#fff;box-shadow:0 10px 30px -12px rgba(224,27,38,.75);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 16px 36px -12px rgba(224,27,38,.9)}
.btn--ghost{border-color:var(--line-strong);background:rgba(255,255,255,.03);color:var(--text)}
.btn--ghost:hover{border-color:var(--steel);background:rgba(255,255,255,.07)}
.btn--sm{padding:11px 20px;font-size:15px}
.btn--wide{width:100%}

.eyebrow{
  font-family:var(--ff-head);text-transform:uppercase;letter-spacing:.22em;
  font-size:13px;color:var(--red);margin-bottom:16px;font-weight:600;
}
.accent{color:var(--red)}
.lead{color:var(--muted);font-size:clamp(16px,1.5vw,19px);margin:20px 0 28px;max-width:56ch}

/* ---------- Хедер ---------- */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(11,12,14,.72);backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:border-color .25s,background .25s;
}
.header.is-stuck{border-bottom-color:var(--line);background:rgba(11,12,14,.94)}
.header__inner{display:flex;align-items:center;gap:24px;min-height:78px}

.logo{display:flex;align-items:center;gap:12px;flex-shrink:0}
.logo img{border-radius:8px;object-fit:cover;width:52px;height:52px}
.logo__text{display:flex;flex-direction:column;gap:4px;line-height:1.05}
.logo__text b{
  font-family:var(--ff-head);font-size:21px;text-transform:lowercase;letter-spacing:.02em;
  color:var(--steel);font-weight:700;
}
.logo__text b i{font-style:italic;color:var(--red)}
.logo__text small{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}

.nav{display:flex;gap:28px;margin-left:auto;font-size:16px;font-weight:600}
.nav a{color:var(--muted);transition:color .2s;white-space:nowrap}
.nav a:hover{color:var(--text)}

.header__actions{display:flex;align-items:center;gap:16px;margin-left:auto}
.header__phone{font-family:var(--ff-head);font-size:19px;font-weight:600;white-space:nowrap}
.header__phone:hover{color:var(--red)}

.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;padding:8px}
.burger span{width:24px;height:2px;background:var(--text);transition:.25s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{position:relative;padding:clamp(56px,8vw,110px) 0 clamp(48px,6vw,90px);overflow:hidden}
.hero__bg{
  position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(900px 480px at 78% 12%,rgba(224,27,38,.20),transparent 62%),
    radial-gradient(700px 500px at 8% 88%,rgba(140,150,165,.12),transparent 60%),
    linear-gradient(180deg,#0d0f12,var(--bg));
}
.hero__bg::after{
  content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:76px 76px;
  mask-image:radial-gradient(70% 60% at 50% 40%,#000,transparent 75%);
}
.hero__inner{
  position:relative;z-index:1;
  display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);
  column-gap:clamp(24px,3.5vw,56px);align-items:center;
}
.hero__content{max-width:660px}

/* Иллюстрация подготовлена под тёмную тему заранее: светлые линии
   на прозрачном фоне, поэтому здесь никаких фильтров не нужно. */
.hero__art{position:relative}
.hero__art img{width:100%;height:auto}
.hero__art::after{
  content:"";position:absolute;z-index:-1;inset:12% 6% 8%;
  background:radial-gradient(50% 50% at 50% 55%,rgba(224,27,38,.20),transparent 70%);
  filter:blur(26px);
}
.hero__lead{color:var(--muted);font-size:clamp(16px,1.6vw,20px);margin-top:24px;max-width:62ch}

.hero__points{list-style:none;padding:0;margin:34px 0 0;display:grid;gap:12px;max-width:640px}
.hero__points li{
  display:flex;gap:14px;align-items:baseline;
  padding:13px 18px;border:1px solid var(--line);border-radius:12px;
  background:rgba(255,255,255,.025);font-size:16px;
}
.hero__points span{font-family:var(--ff-head);color:var(--red);font-weight:700;font-size:14px}

.hero__cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.hero__note{color:var(--muted);font-size:15px;margin-top:18px}

.hero__stats{
  grid-column:1 / -1;
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  margin-top:clamp(48px,6vw,76px);background:var(--line);
  border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;
}
.stat{background:var(--bg-2);padding:26px 22px;text-align:center}
.stat b{display:block;font-family:var(--ff-head);font-size:clamp(28px,3.4vw,40px);color:var(--steel);line-height:1}
.stat span{display:block;margin-top:8px;color:var(--muted);font-size:14px}

/* ---------- Секции ---------- */
.section{padding:clamp(64px,8vw,110px) 0}
.section--alt{background:var(--bg-2);border-block:1px solid var(--line)}
.section__head{margin-bottom:clamp(36px,5vw,60px);max-width:800px}

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

.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 26px;transition:border-color .25s,transform .25s;
}
.card:hover{border-color:var(--line-strong);transform:translateY(-3px)}
.card__ico{font-size:26px;margin-bottom:14px;filter:grayscale(.2)}
.card h3{margin-bottom:10px}
.card p{color:var(--muted);font-size:16px}

.callout{
  margin-top:36px;padding:clamp(26px,3.5vw,40px);
  border:1px solid rgba(224,27,38,.35);border-radius:var(--radius-lg);
  background:linear-gradient(120deg,rgba(224,27,38,.12),rgba(224,27,38,.02) 55%),var(--surface);
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.callout h3{margin-bottom:10px;font-size:clamp(20px,2.4vw,27px)}
.callout p{color:var(--muted);max-width:62ch;font-size:16px}
.callout .btn{flex-shrink:0}

/* ---------- Услуги ---------- */
.service{
  position:relative;padding:32px 28px 30px;
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);
  transition:border-color .25s,background .25s;
}
.service:hover{border-color:rgba(224,27,38,.5);background:var(--surface-2)}
.service__num{
  font-family:var(--ff-head);font-size:13px;letter-spacing:.2em;color:var(--red);
  display:block;margin-bottom:14px;font-weight:600;
}
.service h3{margin-bottom:12px}
.service p{color:var(--muted);font-size:16px}

/* ---------- Этапы ---------- */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.step{display:flex;gap:22px;padding:clamp(24px,3vw,34px);background:var(--bg)}
.step__n{
  flex-shrink:0;width:52px;height:52px;border-radius:50%;
  display:grid;place-items:center;font-family:var(--ff-head);font-size:22px;font-weight:600;
  color:#fff;background:linear-gradient(180deg,var(--red),var(--red-2));
  box-shadow:0 8px 22px -10px rgba(224,27,38,.9);
}
.step h3{margin-bottom:8px}
.step p{color:var(--muted);font-size:16px}

/* ---------- Материалы / split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,64px);align-items:center}
.mats{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.mats li{border-left:3px solid var(--red);padding:6px 0 6px 22px}
.mats h3{margin-bottom:6px;font-size:19px}
.mats p{color:var(--muted);font-size:16px}

.trust{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.trust li{
  padding:20px 22px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--surface);color:var(--muted);font-size:16px;
}
.trust b{color:var(--text)}

/* ---------- Работы: карусель ---------- */
.slider{position:relative}
.slider__viewport{overflow:hidden;border-radius:var(--radius-lg)}
.slider__track{display:flex;will-change:transform}
.slider__track.is-animated{transition:transform .5s cubic-bezier(.4,.02,.2,1)}

.slide{flex:0 0 100%;min-width:0;margin:0;padding:0 0 4px}
.slide__media{
  position:relative;display:block;width:100%;padding:0;overflow:hidden;
  height:clamp(300px,46vw,560px);
  border:1px solid var(--line);border-radius:var(--radius);
  background:var(--surface);transition:border-color .25s;
}
.slide__media:hover{border-color:var(--red)}
/* размытая копия кадра закрывает поля у фото с разными пропорциями */
.slide__blur{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  filter:blur(26px) saturate(.6) brightness(.45);transform:scale(1.15);
}
.slide__img{
  position:relative;width:100%;height:100%;object-fit:contain;
  transition:transform .5s ease;
}
.slide__media:hover .slide__img{transform:scale(1.02)}
.slide figcaption{
  color:var(--muted);font-size:15px;margin-top:16px;
  min-height:3.2em;padding-inline:2px;
}

.slider__arrow{
  position:absolute;top:clamp(150px,23vw,280px);transform:translateY(-50%);
  z-index:3;width:54px;height:54px;border-radius:50%;
  display:grid;place-items:center;
  background:rgba(11,12,14,.72);border:1px solid var(--line-strong);
  backdrop-filter:blur(6px);transition:.2s;
}
.slider__arrow svg{width:22px;height:22px;fill:none;stroke:var(--text);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.slider__arrow:hover{background:var(--red);border-color:var(--red);transform:translateY(-50%) scale(1.06)}
.slider__arrow--prev{left:14px}
.slider__arrow--next{right:14px}

.slider__bar{display:flex;align-items:center;justify-content:center;gap:20px;margin-top:22px}
.slider__dots{display:flex;gap:10px}
.slider__dots button{
  width:11px;height:11px;padding:0;border-radius:50%;border:0;
  background:var(--line-strong);transition:.25s;
}
.slider__dots button:hover{background:var(--steel)}
.slider__dots button[aria-selected="true"]{background:var(--red);width:30px;border-radius:99px}
.slider__counter{font-family:var(--ff-head);font-size:15px;color:var(--muted);letter-spacing:.08em}

.works__note{color:var(--muted);font-size:15px;margin-top:24px;text-align:center}

/* ---------- Цены ---------- */
.plans{align-items:stretch}
.plan{
  position:relative;display:flex;flex-direction:column;
  padding:34px 30px;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);
}
.plan--best{border-color:rgba(224,27,38,.55);background:linear-gradient(180deg,rgba(224,27,38,.09),transparent 42%),var(--surface)}
.plan__badge{
  position:absolute;top:-13px;left:30px;background:var(--red);color:#fff;
  font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  padding:6px 14px;border-radius:99px;
}
.plan__price{font-family:var(--ff-head);font-size:19px;color:var(--muted);margin:14px 0 20px}
.plan__price b{font-size:clamp(30px,3.6vw,40px);color:var(--text)}
.plan ul{list-style:none;padding:0;margin:0 0 28px;display:grid;gap:10px;flex:1}
.plan li{position:relative;padding-left:26px;color:var(--muted);font-size:16px}
.plan li::before{content:"";position:absolute;left:0;top:11px;width:9px;height:9px;border-radius:2px;background:var(--red)}
.prices__note{color:var(--muted);font-size:15px;text-align:center;margin-top:28px}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:12px}
.faq details{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);
  padding:6px 24px;transition:border-color .25s;
}
.faq details[open]{border-color:var(--line-strong)}
.faq summary{
  list-style:none;cursor:pointer;padding:18px 34px 18px 0;position:relative;
  font-weight:700;font-size:clamp(16px,1.7vw,18px);
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);
  font-size:26px;color:var(--red);line-height:1;font-weight:400;
}
.faq details[open] summary::after{content:"−"}
.faq p{color:var(--muted);font-size:16px;padding:0 0 20px}

/* ---------- Контакты / форма ---------- */
.contact{background:radial-gradient(800px 420px at 85% 10%,rgba(224,27,38,.13),transparent 60%),var(--bg)}
.split--form{align-items:start}
.split--rev .trust{order:2}

.contacts{list-style:none;padding:0;margin:30px 0 0;display:grid;gap:18px}
.contacts li{display:grid;gap:4px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.contacts span{font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.contacts a,.contacts b{font-family:var(--ff-head);font-size:20px;font-weight:600}
.contacts a:hover{color:var(--red)}
/* ссылки на мессенджеры и соцсети — кнопками, чтобы легко попадать пальцем */
.contacts__links{display:flex;flex-wrap:wrap;gap:10px;margin-top:4px}
.contacts__links a{
  font-size:16px;padding:9px 18px;border-radius:99px;
  border:1px solid var(--line-strong);background:rgba(255,255,255,.03);
  transition:border-color .2s,background .2s,color .2s;
}
.contacts__links a:hover{border-color:var(--red);background:rgba(224,27,38,.12);color:var(--text)}

.form{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:clamp(26px,3.4vw,38px);display:grid;gap:18px;
}
.form__row{display:grid;gap:8px}
.form__row label{font-size:14px;color:var(--muted);letter-spacing:.04em}
.form input[type=text],.form input[type=tel],.form textarea{
  width:100%;padding:15px 18px;border-radius:10px;
  border:1px solid var(--line-strong);background:rgba(255,255,255,.03);
  color:var(--text);font:inherit;font-size:16px;transition:border-color .2s,background .2s;
}
.form input::placeholder,.form textarea::placeholder{color:#697079}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--red);background:rgba(255,255,255,.05)}
.form textarea{resize:vertical}
.form__err{display:none;color:#ff6b6b;font-size:14px}
.form__row.is-error .form__err{display:block}
.form__row.is-error input{border-color:#ff6b6b}
.form__agree{display:flex;gap:10px;align-items:flex-start;color:var(--muted);font-size:14px}
.form__agree input{margin-top:4px;accent-color:var(--red);width:17px;height:17px;flex-shrink:0;cursor:pointer}
.form__agree label{cursor:pointer}
.form__agree a{color:var(--steel);text-decoration:underline;text-underline-offset:3px}
.form__agree a:hover{color:var(--red)}
.form__ok{
  background:rgba(46,160,90,.14);border:1px solid rgba(46,160,90,.4);
  color:#7ee2a8;padding:14px 18px;border-radius:10px;font-size:15px;
}

/* ---------- Футер ---------- */
.footer{border-top:1px solid var(--line);background:var(--bg-2);padding:44px 0 90px}
.footer__inner{display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between}
.footer__nav{display:flex;flex-wrap:wrap;gap:22px;color:var(--muted);font-size:16px}
.footer__nav a:hover{color:var(--text)}
.footer__bottom{
  width:100%;display:flex;flex-wrap:wrap;gap:12px 24px;
  align-items:center;justify-content:space-between;
  border-top:1px solid var(--line);padding-top:20px;
}
.footer__copy{color:#6d747e;font-size:14px}
/* подпись студии-разработчика */
.footer__author{
  font-family:var(--ff-head);font-size:16px;font-weight:600;
  letter-spacing:.16em;text-transform:lowercase;color:#6d747e;
  transition:color .2s;
}
/* при наведении — бирюзовый градиент из логотипа grit */
.footer__author:hover{color:#35d3ae}
@supports ((background-clip:text) or (-webkit-background-clip:text)){
  .footer__author:hover{
    background:linear-gradient(120deg,#2fa8dc,#35d3ae);
    -webkit-background-clip:text;background-clip:text;
    -webkit-text-fill-color:transparent;color:transparent;
  }
}

/* ---------- Мобильная панель звонка ---------- */
.callbar{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:90;
  background:linear-gradient(180deg,var(--red),var(--red-2));color:#fff;
  text-align:center;padding:16px;font-weight:700;font-size:17px;
  box-shadow:0 -8px 24px rgba(0,0,0,.5);
}

/* ---------- Лайтбокс ---------- */
.lightbox{
  position:fixed;inset:0;z-index:200;background:rgba(6,7,9,.94);
  display:grid;place-items:center;padding:24px;
}
.lightbox[hidden]{display:none}
.lightbox__fig{margin:0;display:grid;gap:14px;justify-items:center}
.lightbox img{max-width:min(1100px,88vw);max-height:80vh;object-fit:contain;border-radius:10px}
.lightbox figcaption{color:var(--muted);font-size:15px;max-width:70ch;text-align:center}
.lightbox__close{
  position:absolute;top:18px;right:22px;background:none;border:0;
  font-size:42px;line-height:1;color:#fff;opacity:.8;z-index:2;
}
.lightbox__close:hover{opacity:1}
.lightbox__nav{
  position:absolute;top:50%;transform:translateY(-50%);z-index:2;
  width:56px;height:56px;border-radius:50%;display:grid;place-items:center;
  background:rgba(255,255,255,.07);border:1px solid var(--line-strong);transition:.2s;
}
.lightbox__nav svg{width:24px;height:24px;fill:none;stroke:#fff;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.lightbox__nav:hover{background:var(--red);border-color:var(--red)}
.lightbox__nav--prev{left:16px}
.lightbox__nav--next{right:16px}

/* ---------- Анимация появления ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.is-in{opacity:1;transform:none}

/* ============================================================
   Адаптив
   ============================================================ */
@media (max-width:1080px){
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .nav{display:none}

  /* иллюстрация уходит под текст и не спорит с ним за ширину */
  .hero__inner{grid-template-columns:1fr}
  .hero__content{max-width:720px}
  .hero__art{margin-top:clamp(28px,5vw,44px);max-width:620px;width:100%}
}
@media (max-width:900px){
  body{font-size:17px}
  .grid--3{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .split--rev .trust{order:0}
  .header__phone{display:none}
  .burger{display:flex}
  .header__actions{margin-left:auto}

  .nav{
    display:flex;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;gap:0;
    background:var(--bg-2);border-bottom:1px solid var(--line);
    padding:8px 0;transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:.22s;
  }
  .nav.is-open{transform:none;opacity:1;pointer-events:auto}
  .nav a{padding:15px var(--pad);border-bottom:1px solid var(--line);font-size:17px}
  .nav a:last-child{border-bottom:0}

  .callbar{display:block}
  .callout{flex-direction:column;align-items:flex-start}
  .callout .btn{width:100%}
}
@media (max-width:560px){
  .grid--4{grid-template-columns:1fr}
  /* три плашки в ряд на телефоне уже не читаются — ставим в столбик */
  .hero__stats{grid-template-columns:1fr}
  .stat{display:flex;align-items:baseline;justify-content:center;gap:12px;padding:18px 22px;text-align:left}
  .stat span{margin-top:0}
  .hero__cta .btn{width:100%}
  .header__actions .btn{display:none}
  .logo__text small{display:none}
  .step{flex-direction:column;gap:14px}

  /* на узких экранах листаем свайпом, стрелки уменьшаем и прижимаем к краям */
  .slider__arrow{width:42px;height:42px}
  .slider__arrow svg{width:18px;height:18px}
  .slider__arrow--prev{left:8px}
  .slider__arrow--next{right:8px}
  .slide figcaption{min-height:0}
  .lightbox__nav{width:44px;height:44px}
  .lightbox__nav--prev{left:6px}
  .lightbox__nav--next{right:6px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
}