/* Общая дизайн-система сайта ООО «Сорок два» */
:root{
  --blue:#3762FE; --blue-dark:#2549d6;
  --ink:#111827; --gray:#5b6472; --gray2:#6b7280;
  --bg-soft:#f5f7fb; --border:#e5e7eb; --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Montserrat',Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.6}
.container{max-width:1140px;margin:0 auto;padding:0 20px}
a{color:var(--blue)}
img{max-width:100%;display:block}
section{padding:72px 0}
h1{font-size:44px;font-weight:800;line-height:1.15;letter-spacing:-.02em}
h2{font-size:32px;font-weight:700;line-height:1.2;letter-spacing:-.01em}
h3{font-size:19px;font-weight:700}
.lead{font-size:18px;color:var(--gray);max-width:680px}
.btn{display:inline-block;padding:15px 30px;border-radius:12px;font-weight:600;font-size:16px;text-decoration:none;cursor:pointer;border:none;transition:.2s;font-family:inherit}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-outline{background:#fff;color:var(--blue);border:2px solid var(--blue)}
.btn-outline:hover{background:var(--blue);color:#fff}
.btn-white{background:#fff;color:var(--blue)}
.btn-white:hover{background:var(--bg-soft)}

/* Header */
.site-header{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);z-index:100}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{font-size:22px;font-weight:800;text-decoration:none;color:var(--ink)}
.logo span{color:var(--blue)}
.nav-links{display:flex;gap:26px;list-style:none}
.nav-links a{text-decoration:none;color:var(--ink);font-size:15px;font-weight:500}
.nav-links a:hover{color:var(--blue)}
.nav-right{display:flex;align-items:center;gap:18px}
.nav-right .btn{padding:10px 20px;font-size:14px}
.nav-phone{font-weight:700;text-decoration:none;color:var(--ink);font-size:15px}
.burger{display:none;background:none;border:none;font-size:26px;cursor:pointer}

/* Breadcrumbs */
.breadcrumbs{padding:20px 0 0;font-size:13px;color:var(--gray2)}
.breadcrumbs a{color:var(--gray2);text-decoration:none}
.breadcrumbs a:hover{color:var(--blue)}
.breadcrumbs span{color:var(--ink)}

/* Service hero */
.svc-hero{padding:48px 0 64px;background:linear-gradient(180deg,#fff,var(--bg-soft))}
.svc-hero .tag{display:inline-block;background:#e7edff;color:var(--blue);font-weight:600;font-size:13px;padding:6px 14px;border-radius:99px;margin-bottom:20px}
.svc-hero h1 span{color:var(--blue)}
.svc-hero p{margin:22px 0 30px}
.svc-hero .actions{display:flex;gap:14px;flex-wrap:wrap}

/* Sections */
.section-head{max-width:720px;margin-bottom:44px}
.section-head h2{margin-bottom:14px}
.bg-soft{background:var(--bg-soft)}

/* Feature grid */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.bg-soft .feature{background:#fff}
.feature .ic{width:46px;height:46px;border-radius:12px;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.feature h3{margin-bottom:8px}
.feature p{color:var(--gray);font-size:15px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:s}
.step{position:relative;padding-top:8px}
.step .n{color:var(--blue);font-weight:800;font-size:26px;margin-bottom:10px}
.step h3{margin-bottom:6px;font-size:17px}
.step p{color:var(--gray);font-size:14px}

/* Bullets list */
.checklist{display:grid;grid-template-columns:1fr 1fr;gap:12px 32px;margin-top:10px}
.checklist li{list-style:none;padding-left:30px;position:relative;color:var(--gray);font-size:15px}
.checklist li::before{content:'✓';position:absolute;left:0;top:0;color:#fff;background:var(--blue);width:20px;height:20px;border-radius:50%;font-size:12px;display:flex;align-items:center;justify-content:center;font-weight:700}

/* Chips */
.chips{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.chip{background:#fff;border:1px solid var(--border);border-radius:99px;padding:9px 20px;font-weight:600;font-size:14px}

/* FAQ */
.faq-item{border-bottom:1px solid var(--border)}
.faq-item summary{cursor:pointer;list-style:none;padding:22px 40px 22px 0;font-weight:600;font-size:17px;position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';position:absolute;right:6px;top:18px;font-size:24px;color:var(--blue);font-weight:400}
.faq-item[open] summary::after{content:'–'}
.faq-item p{color:var(--gray);padding:0 0 22px;max-width:820px}

/* CTA band */
.cta-band{background:var(--blue);color:#fff;border-radius:24px;padding:52px;text-align:center}
.cta-band h2{margin-bottom:14px}
.cta-band p{opacity:.9;max-width:560px;margin:0 auto 28px}

/* Related services */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:20px}
.rel-card{border:1px solid var(--border);border-radius:14px;padding:20px 22px;text-decoration:none;color:var(--ink);transition:.2s}
.rel-card:hover{border-color:var(--blue);box-shadow:0 8px 24px rgba(55,98,254,.1)}
.rel-card b{display:block;font-size:16px;margin-bottom:4px}
.rel-card span{color:var(--gray2);font-size:14px}

/* Footer */
.site-footer{background:var(--ink);color:#9ca3af;padding:60px 0 30px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;margin-bottom:44px}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.site-footer a{color:#9ca3af;text-decoration:none;display:block;margin-bottom:10px}
.site-footer a:hover{color:#fff}
.flogo{font-size:20px;font-weight:800;color:#fff;margin-bottom:14px}
.flogo span{color:var(--blue)}
.footer-bottom{border-top:1px solid #374151;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px}

.prose p{color:var(--gray);margin-bottom:14px;max-width:820px}
.prose h2{margin:8px 0 16px}

/* Article */
.article-wrap{max-width:800px;margin:0 auto;padding:0 20px}
.article-hero{padding:40px 0 8px}
.article-hero h1{font-size:38px;line-height:1.18}
.article-meta{color:var(--gray2);font-size:14px;margin-top:16px;display:flex;gap:18px;flex-wrap:wrap}
.article-lead{font-size:20px;color:var(--ink);line-height:1.55;margin:22px 0 8px;font-weight:500}
.article-body{padding:20px 0 8px}
.article-body h2{font-size:26px;margin:38px 0 14px;letter-spacing:-.01em}
.article-body h3{font-size:19px;margin:26px 0 8px}
.article-body p{color:#374151;font-size:17px;line-height:1.75;margin-bottom:16px}
.article-body ul{margin:0 0 18px 4px;list-style:none;color:#374151;font-size:17px;line-height:1.7}
.article-body ul li{position:relative;padding-left:26px;margin-bottom:10px}
.article-body ul li::before{content:'';position:absolute;left:4px;top:11px;width:7px;height:7px;border-radius:50%;background:var(--blue)}
.article-body a{color:var(--blue)}
.stat{background:var(--bg-soft);border-left:4px solid var(--blue);border-radius:0 14px 14px 0;padding:18px 22px;margin:22px 0}
.stat .num{color:var(--blue);font-size:26px;font-weight:800;display:block;line-height:1.1;margin-bottom:4px}
.stat span.src{display:block;color:var(--gray2);font-size:13px;margin-top:6px}
.note-box{background:#fff8ea;border:1px solid #ffe0a3;border-radius:12px;padding:14px 18px;font-size:14.5px;color:#8a6100;line-height:1.6;margin:22px 0}
.sources-list{margin:14px 0 0;padding:0;list-style:none;counter-reset:s}
.sources-list li{counter-increment:s;position:relative;padding-left:30px;margin-bottom:10px;font-size:14px;color:var(--gray)}
.sources-list li::before{content:counter(s);position:absolute;left:0;top:0;width:20px;height:20px;background:var(--blue);color:#fff;border-radius:50%;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center}
.sources-list a{word-break:break-word}
@media(max-width:900px){.article-hero h1{font-size:28px}.article-body p,.article-body ul{font-size:16px}.article-lead{font-size:18px}}

@media(max-width:900px){
  h1{font-size:32px}
  h2{font-size:26px}
  section{padding:52px 0}
  .features{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  .checklist{grid-template-columns:1fr}
  .rel-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav-links,.nav-right .btn,.nav-phone{display:none}
  .burger{display:block}
  .cta-band{padding:36px 24px}
  .nav-links.open{display:flex;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;padding:22px;border-bottom:1px solid var(--border);gap:16px}
}