/* ===== VARIABLES & RESET ===== */
:root{
  --bg:#ffffff;
  --dark:#1a1d23;
  --dark-2:#23272f;
  --accent:#F5EB12;        /* фирменный жёлтый */
  --accent-dark:#e3d400;   /* жёлтый для hover-заливок */
  --gold:#9c8800;          /* читаемый жёлтый для текста на светлом */
  --ink:#1a1d23;           /* текст/иконки на жёлтом */
  --grey:#6b7280;
  --grey-light:#f4f5f7;
  --border:#e5e7eb;
  --radius:14px;
  --container:1180px;
  --shadow:0 10px 40px rgba(26,29,35,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;
  color:var(--dark);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
h1,h2,h3,h4,h5{font-family:'Jost',sans-serif;line-height:1.15;font-weight:800}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:90px 0}
.eyebrow{
  display:inline-flex;align-items:center;font-family:'Jost',sans-serif;font-weight:700;
  font-size:13px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink);margin-bottom:14px;
}
.eyebrow::before{
  content:"";width:24px;height:3px;background:var(--accent);
  border-radius:2px;margin-right:11px;
}
.eyebrow--light{color:var(--ink)}
.steps .eyebrow{color:#fff}
.section__title{font-size:clamp(26px,3.4vw,40px);letter-spacing:-.01em}
.section__head{max-width:680px;margin-bottom:48px}
.section__lead{margin-top:14px;color:var(--grey);font-size:17px}

/* ===== BUTTONS ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font-family:'Jost',sans-serif;font-weight:700;font-size:15px;
  padding:15px 30px;border-radius:10px;cursor:pointer;border:2px solid transparent;
  transition:.2s;white-space:nowrap;
}
.btn--primary{background:var(--accent);color:var(--ink)}
.btn--primary:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:0 10px 24px rgba(245,235,18,.4)}
.btn--ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}
.btn--ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn--block{width:100%}

/* ===== HEADER ===== */
.header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(26,29,35,.0);transition:.3s;padding:18px 0;
}
.header.scrolled{background:rgba(26,29,35,.97);padding:12px 0;box-shadow:0 6px 24px rgba(0,0,0,.25);backdrop-filter:blur(8px)}
.header__inner{display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:12px}
.logo__img{height:46px;width:auto;display:block;transition:height .3s}
.header.scrolled .logo__img{height:40px}
.logo--footer .logo__img{height:44px}
.logo__text{font-family:'Jost',sans-serif;font-weight:900;font-size:22px;color:#fff;line-height:1;display:flex;flex-direction:column}
.logo__text small{font-weight:500;font-size:9.5px;letter-spacing:.08em;text-transform:uppercase;color:#9aa1ad;margin-top:4px;font-family:'Inter',sans-serif}
.nav{display:flex;gap:22px;margin-left:auto}
.nav__link{color:#d6d9de;font-size:15px;font-weight:500;transition:.2s}
.nav__link:hover{color:var(--accent)}
.header__phone{color:#fff;font-family:'Jost',sans-serif;font-weight:700;font-size:17px;transition:.2s}
.header__phone:hover{color:var(--accent)}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.burger span{width:26px;height:3px;background:#fff;border-radius:2px;transition:.3s}
.burger.open span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* ===== HERO ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;color:#fff;overflow:hidden;background:var(--dark)}
.hero__bg{
  position:absolute;inset:0;
  background:
    radial-gradient(900px 600px at 80% 10%,rgba(245,235,18,.14),transparent 60%),
    linear-gradient(135deg,#1a1d23 0%,#23272f 55%,#1a1d23 100%);
}
.hero__bg::after{
  content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:54px 54px;
  -webkit-mask-image:radial-gradient(circle at 70% 40%,#000,transparent 75%);
  mask-image:radial-gradient(circle at 70% 40%,#000,transparent 75%);
}
.hero__inner{position:relative;z-index:2;padding-top:120px;padding-bottom:60px}
.hero__content{max-width:760px}
.hero__badge{
  display:inline-block;background:rgba(245,235,18,.12);border:1px solid rgba(245,235,18,.45);
  color:#f3ec8a;padding:8px 18px;border-radius:50px;font-size:14px;font-weight:600;margin-bottom:26px;
}
.hero__title{font-size:clamp(26px,4.6vw,56px);font-weight:900;letter-spacing:-.02em;margin-bottom:24px;overflow-wrap:break-word}
.hero__title span{color:var(--accent)}
.hero__text{font-size:clamp(16px,2vw,20px);color:#c7cbd2;max-width:600px;margin-bottom:36px}
.hero__actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:54px}
.hero__stats{display:flex;gap:48px;flex-wrap:wrap}
.stat b{display:block;font-family:'Jost',sans-serif;font-size:38px;font-weight:900;color:#fff}
.stat span{color:#9aa1ad;font-size:14px}

/* ===== ABOUT ===== */
.about__inner{display:grid;grid-template-columns:1.4fr 1fr;gap:64px;align-items:center}
.about__text p{color:var(--grey);margin-bottom:16px;font-size:16.5px}
.about__list{margin-top:24px;display:grid;gap:12px}
.about__list li{position:relative;padding-left:32px;font-weight:500}
.about__list li::before{content:"✓";position:absolute;left:0;top:0;width:22px;height:22px;background:var(--accent);color:var(--ink);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}
.about__cards{display:grid;gap:18px}
.about__card{background:var(--grey-light);border-radius:var(--radius);padding:26px 28px;border:1px solid var(--border)}
.about__card--accent{background:var(--dark);color:#fff;border-color:var(--dark)}
.about__num{display:block;font-family:'Jost',sans-serif;font-weight:900;font-size:30px;color:var(--ink)}
.about__card--accent .about__num{color:var(--accent)}
.about__label{display:block;color:var(--grey);margin-top:6px;font-size:14.5px}
.about__card--accent .about__label{color:#b7bcc6}

/* ===== SERVICES ===== */
.services{background:var(--grey-light)}
.services__group{margin-top:40px}
.services__group-title{font-size:22px;display:flex;align-items:center;gap:12px;margin-bottom:24px}
.services__ico{display:inline-flex;align-items:center;justify-content:center;width:46px;height:46px;background:#fff;border-radius:12px;font-size:22px;box-shadow:var(--shadow)}
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:#fff;border-radius:var(--radius);padding:26px 24px;border:1px solid var(--border);transition:.25s}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:transparent}
.card h4{font-size:18px;margin-bottom:10px}
.card p{color:var(--grey);font-size:14.5px}

/* ===== ADVANTAGES ===== */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.adv{padding:30px 28px;border-radius:var(--radius);border:1px solid var(--border);transition:.25s}
.adv:hover{border-color:var(--accent);box-shadow:var(--shadow)}
.adv__ico{font-family:'Jost',sans-serif;font-size:34px;font-weight:900;color:var(--ink);margin-bottom:14px;position:relative;display:inline-block;padding-bottom:8px}
.adv__ico::after{content:"";position:absolute;left:2px;bottom:0;width:26px;height:3px;background:var(--accent);border-radius:2px}
.adv h4{font-size:18px;margin-bottom:10px}
.adv p{color:var(--grey);font-size:15px}

/* ===== CLIENTS ===== */
.clients{background:var(--grey-light)}
.clients__grid{
  display:flex;flex-wrap:wrap;justify-content:center;align-items:center;
  gap:24px;
}
.client{
  flex:0 1 240px;max-width:260px;
  display:flex;align-items:center;justify-content:center;
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:24px 26px;min-height:96px;transition:.25s;
  filter:grayscale(1);opacity:.65;
}
.client svg{width:auto;height:38px;max-width:100%}
.client:hover{filter:grayscale(0);opacity:1;transform:translateY(-5px);box-shadow:var(--shadow);border-color:transparent}

/* ===== STEPS ===== */
.steps{background:var(--dark);color:#fff}
.steps .eyebrow{color:var(--accent)}
.steps .section__title{color:#fff}
.steps__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.step{position:relative;padding:30px 26px;background:var(--dark-2);border-radius:var(--radius);border:1px solid #31363f}
.step__n{font-family:'Jost',sans-serif;font-size:44px;font-weight:900;color:rgba(245,235,18,.92);line-height:1;display:block;margin-bottom:16px}
.step h4{font-size:18px;margin-bottom:10px}
.step p{color:#aeb3bd;font-size:14.5px}

/* ===== CONTACTS ===== */
.contacts{background:var(--grey-light)}
.contacts__inner{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.contacts__lead{color:var(--grey);margin-bottom:30px;font-size:17px}
.contacts__list{display:grid;gap:18px}
.contacts__list li{display:flex;flex-direction:column;gap:2px;padding-bottom:16px;border-bottom:1px solid var(--border)}
.contacts__list span{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--grey);font-weight:600}
.contacts__list a{font-family:'Jost',sans-serif;font-weight:700;font-size:18px;color:var(--dark)}
.contacts__list a[href^="tel"]:hover,.contacts__list a[href^="mailto"]:hover{color:var(--gold)}
.contacts__form{background:#fff;border-radius:var(--radius);padding:38px 34px;box-shadow:var(--shadow)}
.contacts__form h3{font-size:22px;margin-bottom:24px}
.field{position:relative;margin-bottom:18px}
.field input,.field textarea{
  width:100%;padding:18px 16px 8px;border:1.5px solid var(--border);border-radius:10px;
  font-family:inherit;font-size:15px;background:#fff;transition:.2s;resize:vertical;
}
.field textarea{padding-top:22px}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--gold)}
.field label{
  position:absolute;left:16px;top:15px;color:var(--grey);font-size:15px;
  pointer-events:none;transition:.18s;
}
.field input:focus+label,.field input:not(:placeholder-shown)+label,
.field textarea:focus+label,.field textarea:not(:placeholder-shown)+label{
  top:7px;font-size:11px;color:var(--gold);font-weight:600;letter-spacing:.03em;
}
.field.invalid input,.field.invalid textarea{border-color:#e53935}
.form__note{font-size:12.5px;color:var(--grey);margin-top:14px;text-align:center}
.form__success{margin-top:16px;background:#e8f6ec;color:#1f7a3d;padding:14px 16px;border-radius:10px;font-size:14.5px;text-align:center}

/* ===== FOOTER ===== */
.footer{background:var(--dark);color:#cfd3da;padding-top:60px}
.footer__inner{display:grid;grid-template-columns:2fr 1fr 1.4fr;gap:40px;padding-bottom:46px}
.logo--footer .logo__text{font-size:24px}
.footer__about{margin-top:16px;color:#8b909b;font-size:15px;max-width:320px}
.footer__col h5{font-family:'Jost',sans-serif;color:#fff;font-size:15px;margin-bottom:16px;font-weight:700}
.footer__col a,.footer__col span{display:block;color:#9aa1ad;margin-bottom:10px;font-size:15px;transition:.2s}
.footer__col a:hover{color:var(--accent)}
.footer__bottom{border-top:1px solid #2c313a;padding:22px 0;font-size:13.5px;color:#7b818d;text-align:center}

/* ===== TO-TOP ===== */
.to-top{
  position:fixed;right:24px;bottom:24px;width:48px;height:48px;border-radius:12px;
  background:var(--accent);color:var(--ink);display:flex;align-items:center;justify-content:center;
  font-size:22px;z-index:90;opacity:0;visibility:hidden;transform:translateY(10px);transition:.3s;box-shadow:0 8px 20px rgba(245,235,18,.45)
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--accent-dark)}

/* ===== RESPONSIVE ===== */
@media(max-width:980px){
  .cards{grid-template-columns:repeat(2,1fr)}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .steps__grid{grid-template-columns:repeat(2,1fr)}
  .about__inner,.contacts__inner{grid-template-columns:1fr;gap:40px}
  .footer__inner{grid-template-columns:1fr 1fr;gap:30px}
  .header__phone{display:none}
  .burger{display:flex;margin-left:auto}
  .nav{
    position:fixed;top:0;right:-100%;width:78%;max-width:320px;height:100vh;
    flex-direction:column;background:var(--dark-2);padding:90px 30px 30px;gap:8px;
    margin-left:0;transition:.35s;box-shadow:-10px 0 40px rgba(0,0,0,.4)
  }
  .nav.open{right:0}
  .nav__link{font-size:18px;padding:12px 0;border-bottom:1px solid #31363f;width:100%}
}
@media(max-width:760px){
  .section{padding:64px 0}
  .hero__stats{gap:28px}
  .stat b{font-size:30px}
}
@media(max-width:380px){
  .hero__title{font-size:25px}
}
@media(max-width:520px){
  .cards,.adv-grid,.steps__grid,.footer__inner{grid-template-columns:1fr}
  .hero__actions .btn{width:100%}
  .contacts__form{padding:28px 22px}
}