/* 
Art Direction 2026: Petrol Contrast
Palette: Primary oklch(45% 0.12 220), BG oklch(98% 0.01 220), Accent oklch(85% 0.10 220)
Typography: Headings Geometric Sans (Futura, Avenir), Body System Sans
Composition: Full-width typography strips, scrolling service marquees, pill-shaped UI
Form: Large radii (20px+), high-contrast alternating light/dark sections
Animation: Continuous slow rotation of circular SVG badge, subtle fade-ins
*/
:root {
    --bsng-primary: oklch(45% 0.12 220);
    --bsng-primary-light: oklch(60% 0.10 220);
    --bsng-bg: oklch(98% 0.01 220);
    --bsng-bg-alt: oklch(92% 0.02 220);
    --bsng-text: oklch(25% 0.03 220);
    --bsng-text-inv: oklch(98% 0.01 220);
    --bsng-accent: oklch(85% 0.10 220);
    --bsng-radius: 24px;
    --bsng-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html, body { overflow-x: clip; margin: 0; padding: 0; background: var(--bsng-bg); color: var(--bsng-text); font-family: system-ui, -apple-system, sans-serif; scroll-behavior: smooth; }
[hidden] { display: none !important; }
.bsng-container { max-width: 1240px; margin: 0 auto; padding: 0 20px; width: 100%; box-sizing: border-box; }
.bsng-btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 28px; border-radius: 100px; border: none; cursor: pointer; font-weight: 600; transition: var(--bsng-transition); text-decoration: none; font-size: 0.95rem; gap: 8px; }
.bsng-btn-primary { background: var(--bsng-primary); color: var(--bsng-text-inv); }
.bsng-btn-primary:hover { background: var(--bsng-primary-light); transform: translateY(-2px); }
.bsng-btn-outline { background: transparent; border: 2px solid var(--bsng-primary); color: var(--bsng-primary); }
.bsng-btn-outline:hover { background: var(--bsng-primary); color: var(--bsng-text-inv); }

.bsng-topbar { background: var(--bsng-bg-alt); font-size: 0.8rem; padding: 8px 0; border-bottom: 1px solid var(--bsng-accent); }
.bsng-topbar-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }

.bsng-header { padding: 20px 0; background: var(--bsng-bg); position: sticky; top: 0; z-index: 100; }
.bsng-header-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.bsng-logo { font-family: "Futura", "Century Gothic", Avenir, sans-serif; font-weight: 800; font-size: 1.5rem; text-decoration: none; color: var(--bsng-primary); display: flex; flex-direction: column; }
.bsng-logo-domain { font-size: 0.7rem; font-weight: 400; opacity: 0.6; letter-spacing: 1px; }

.bsng-nav { display: flex; align-items: center; gap: 30px; }
.bsng-nav-list { display: flex; list-style: none; margin: 0; padding: 0; gap: 20px; }
.bsng-nav-link { text-decoration: none; color: var(--bsng-text); font-weight: 500; font-size: 0.95rem; transition: var(--bsng-transition); }
.bsng-nav-link:hover { color: var(--bsng-primary); }

.bsng-lang-switch { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; }
.bsng-lang-link { text-decoration: none; color: var(--bsng-text); font-weight: 600; padding: 4px 8px; border-radius: 8px; transition: var(--bsng-transition); }
.bsng-lang-link:hover { background: var(--bsng-accent); }

.bsng-menu-toggle { display: none; padding: 10px; background: none; border: none; cursor: pointer; order: 3; }

@media (max-width: 959px) {
    .bsng-menu-toggle { display: block; }
    .bsng-nav { position: fixed; top: 0; right: -100%; width: 300px; height: 100vh; background: var(--bsng-bg); box-shadow: -10px 0 30px rgba(0,0,0,0.1); transition: 0.4s ease; flex-direction: column; padding: 80px 40px; z-index: 101; }
    .bsng-nav.bsng-open { right: 0; }
    .bsng-nav-list { flex-direction: column; width: 100%; }
}

.bsng-hero { background: var(--bsng-primary); color: var(--bsng-text-inv); padding: 100px 0; border-radius: 0 0 var(--bsng-radius) var(--bsng-radius); position: relative; overflow: hidden; }
.bsng-hero-content { max-width: 800px; position: relative; z-index: 2; }
.bsng-h1 { font-family: "Futura", "Century Gothic", Avenir, sans-serif; font-size: clamp(2.5rem, 8vw, 4.5rem); line-height: 1.1; margin: 0 0 24px; }
.bsng-lead { font-size: clamp(1.1rem, 3vw, 1.4rem); line-height: 1.6; margin-bottom: 40px; opacity: 0.9; }

.bsng-marquee { background: var(--bsng-bg-alt); padding: 40px 0; overflow: hidden; white-space: nowrap; border-top: 1px solid var(--bsng-accent); border-bottom: 1px solid var(--bsng-accent); }
.bsng-marquee-content { display: inline-flex; animation: bsng-scroll 30s linear infinite; gap: 60px; }
.bsng-marquee-item { font-family: "Futura", sans-serif; font-size: 2rem; font-weight: 800; text-transform: uppercase; color: var(--bsng-primary); opacity: 0.7; }
@keyframes bsng-scroll { from { transform: translateX(0); } to { transform: translateX(-50%); } }

.bsng-fact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 30px; padding: 80px 0; }
.bsng-fact-card { background: var(--bsng-bg-alt); padding: 40px; border-radius: var(--bsng-radius); text-align: center; transition: var(--bsng-transition); border: 1px solid transparent; }
.bsng-fact-card:hover { border-color: var(--bsng-primary); background: var(--bsng-bg); }
.bsng-fact-val { display: block; font-family: "Futura", sans-serif; font-size: 3rem; font-weight: 800; color: var(--bsng-primary); margin-bottom: 10px; }

.bsng-services { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; padding: 80px 0; }
.bsng-service-card { padding: 40px; border-radius: var(--bsng-radius); background: var(--bsng-bg-alt); transition: var(--bsng-transition); position: relative; overflow: hidden; border: 1px solid var(--bsng-accent); }
.bsng-service-card:hover { background: var(--bsng-primary); color: var(--bsng-text-inv); }
.bsng-service-num { font-family: "Futura", sans-serif; font-size: 4rem; font-weight: 800; position: absolute; top: -10px; right: 10px; opacity: 0.1; transition: var(--bsng-transition); }
.bsng-service-card:hover .bsng-service-num { opacity: 0.3; color: var(--bsng-text-inv); }

.bsng-process { padding: 80px 0; background: var(--bsng-bg-alt); }
.bsng-process-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; }
.bsng-process-step { position: relative; padding-left: 60px; }
.bsng-process-step::before { content: ""; position: absolute; left: 0; top: 0; width: 40px; height: 40px; background: var(--bsng-primary); border-radius: 50%; color: white; display: flex; align-items: center; justify-content: center; font-weight: 800; }

.bsng-table-wrap { overflow-x: auto; margin: 40px 0; border-radius: var(--bsng-radius); border: 1px solid var(--bsng-accent); }
.bsng-table { width: 100%; border-collapse: collapse; background: white; }
.bsng-table th, .bsng-table td { padding: 20px; text-align: left; border-bottom: 1px solid var(--bsng-bg-alt); }
.bsng-table th { background: var(--bsng-bg-alt); font-family: "Futura", sans-serif; font-weight: 700; }

.bsng-faq { padding: 80px 0; }
.bsng-faq-group { margin-bottom: 60px; }
.bsng-faq-item { margin-bottom: 15px; border: 1px solid var(--bsng-accent); border-radius: 16px; overflow: hidden; }
.bsng-faq-item summary { padding: 20px; cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.bsng-faq-item summary::-webkit-details-marker { display: none; }
.bsng-faq-item p { padding: 0 20px 20px; line-height: 1.7; opacity: 0.8; }

.bsng-prose { line-height: 1.7; font-size: 1.05rem; }
.bsng-prose h2 { font-family: "Futura", sans-serif; font-size: 2.2rem; margin: 40px 0 20px; color: var(--bsng-primary); }
.bsng-prose p { margin-bottom: 20px; overflow-wrap: anywhere; }

.bsng-kicker { display: block; font-weight: 700; text-transform: uppercase; color: var(--bsng-primary); font-size: 0.85rem; margin-bottom: 8px; }
.bsng-reading-time { font-size: 0.85rem; opacity: 0.6; display: block; margin-bottom: 24px; }

.bsng-legal-nav { margin-bottom: 40px; padding: 20px; background: var(--bsng-bg-alt); border-radius: var(--bsng-radius); }
.bsng-legal-nav a { display: block; padding: 8px 0; color: var(--bsng-text); text-decoration: none; border-bottom: 1px solid var(--bsng-accent); }
.bsng-legal-note { font-size: 0.9rem; padding: 20px; background: var(--bsng-bg-alt); border-left: 4px solid var(--bsng-primary); margin: 20px 0; }

.bsng-footer { background: var(--bsng-primary); color: var(--bsng-text-inv); padding: 80px 0 40px; border-radius: var(--bsng-radius) var(--bsng-radius) 0 0; }
.bsng-footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; margin-bottom: 60px; }
.bsng-footer-col h4 { font-family: "Futura", sans-serif; margin: 0 0 20px; text-transform: uppercase; font-size: 0.9rem; letter-spacing: 1px; }
.bsng-footer-col ul { list-style: none; padding: 0; margin: 0; }
.bsng-footer-col li { margin-bottom: 10px; }
.bsng-footer-col a { color: var(--bsng-text-inv); text-decoration: none; opacity: 0.8; transition: var(--bsng-transition); }
.bsng-footer-col a:hover { opacity: 1; }
.bsng-footer-bottom { padding-top: 40px; border-top: 1px solid rgba(255,255,255,0.1); font-size: 0.85rem; opacity: 0.7; line-height: 1.6; }

.bsng-cookie-banner { position: fixed; bottom: 20px; left: 20px; right: 20px; background: white; color: var(--bsng-text); padding: 30px; border-radius: var(--bsng-radius); box-shadow: 0 20px 50px rgba(0,0,0,0.2); z-index: 1000; max-width: 600px; margin: 0 auto; border: 1px solid var(--bsng-accent); }
.bsng-cookie-btns { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.bsng-cookie-panel { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--bsng-accent); }
.bsng-cookie-cat { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; cursor: pointer; font-size: 0.9rem; }

.bsng-badge { position: absolute; width: 120px; height: 120px; animation: bsng-rotate 10s linear infinite; pointer-events: none; opacity: 0.5; }
@keyframes bsng-rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.bsng-skip-link { position: absolute; top: -100px; left: 0; background: var(--bsng-primary); color: white; padding: 10px; z-index: 1001; transition: 0.3s; }
.bsng-skip-link:focus { top: 0; }
.bsng-honey { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.bsng-form { display: grid; gap: 20px; max-width: 600px; }
.bsng-form-group { display: flex; flex-direction: column; gap: 8px; }
.bsng-form-group label { font-weight: 600; font-size: 0.9rem; }
.bsng-form-group input, .bsng-form-group textarea { padding: 12px; border: 1px solid var(--bsng-accent); border-radius: 12px; font-family: inherit; }

@media (prefers-reduced-motion: reduce) {
    *, ::before, ::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

.bsng-breadcrumbs { display: flex; gap: 10px; font-size: 0.85rem; margin-bottom: 30px; align-items: center; }
.bsng-breadcrumbs a { color: var(--bsng-primary); text-decoration: none; }

:focus-visible { outline: 3px solid var(--bsng-primary); outline-offset: 4px; }

/* сборка: защита от переполнения и служебные правила (промпт, разделы 6-7) */
[hidden]{display:none!important}
html,body{overflow-x:clip}
img,video{max-width:100%;height:auto}
:where(main,header,footer) :where(div,section,article,aside,ul,ol,li,figure,details,form,fieldset,nav){min-width:0}
:where(main,footer) :where(h1,h2,h3,h4,p,li,td,th,dd,dt,summary,figcaption,a){overflow-wrap:anywhere;word-break:normal;hyphens:auto}
.bsng-table-wrap{overflow-x:auto;max-width:100%}
.bsng-honey{position:absolute!important;left:auto!important;right:auto!important;top:auto!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;border:0!important;overflow:hidden!important;clip:rect(0 0 0 0)!important;clip-path:inset(50%)!important;white-space:nowrap!important;opacity:0!important}
:where(a){color:inherit;text-underline-offset:.2em}
:where(main) :where(section,article,div,li,figure){position:relative}
@media (max-width:959px){html.js :where(#bsng-menu):not(.bsng-open){display:none!important}:where(header):has(#bsng-menu){position:relative}:where(#bsng-menu).bsng-open{display:flex!important;flex-direction:column;align-items:stretch;gap:.25rem;position:absolute;left:0;right:0;top:100%;z-index:90;max-height:calc(100vh - 4rem);overflow-y:auto;padding:1rem clamp(16px,4vw,32px) 1.5rem;box-sizing:border-box;visibility:visible!important;opacity:1!important;transform:none!important;background:var(--bsng-bg,Canvas);color:var(--bsng-text,CanvasText);box-shadow:0 12px 24px rgb(0 0 0 / .25)}:where(#bsng-menu).bsng-open a{min-height:44px;display:flex;align-items:center}}
html:not(.js) #bsng-menu{display:flex!important;flex-wrap:wrap;position:static!important;transform:none!important;visibility:visible!important;opacity:1!important}
.bsng-figure{margin:2rem 0}.bsng-figure img{display:block;width:100%;height:auto}
.bsng-sitemap ul{columns:2 16rem;padding-left:1.1rem}