/* ========================================================================
   CHIPFPGA.com Global Design System v5.1 — EN-first Architecture
   ========================================================================
   Unifies S3.3 (homepage) and v4 (product pages) into one design system.
   Primary: #0A2540 (deep tech blue)  |  Accent: #00A699 (tech green)
   EN = root path (/), RU = subpath (/ru/, noindex)
   ======================================================================== */

/* ─── 1. Reset & Base ─── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Inter',system-ui,-apple-system,BlinkMacSystemFont,Arial,sans-serif;background:var(--c-bg);color:var(--c-text);line-height:1.6}
a{color:inherit}
img{max-width:100%;height:auto}

/* ─── 2. Unified Design Tokens ─── */
:root{
  /* Core Brand */
  --c-primary:#0A2540;
  --c-primary-light:#0B3A6E;
  --c-accent: #0F7CCF;
  --c-accent-hover: #005F99;
  --c-cta:#0F7CCF;
  --c-cta-hover:#005F99;

  /* Surfaces */
  --c-bg:#F8F9FA;
  --c-surface:#FFFFFF;

  /* Text */
  --c-text:#1F2937;
  --c-text-sec:#6B7280;
  --c-text-muted:#9CA3AF;

  /* Borders */
  --c-border:#E5E7EB;
  --c-border-light:#F3F4F6;

  /* Semantic */
  --c-success:#16A34A;
  --c-warn:#F59E0B;
  --c-error:#DC2626;
  --c-link:#0F7CCF;
  --c-whatsapp:#25D366;

  /* Dark surfaces (header/footer/nav) */
  --c-dark:#0A2540;
  --c-nav-bg:#061A2F;
  --c-topbar-bg:#0A2540;

  /* Radius */
  --radius:8px;
  --radius-lg:12px;
  --radius-sm:6px;

  /* Shadows */
  --shadow:0 1px 3px rgba(0,0,0,.06);
  --shadow-md:0 4px 12px rgba(0,0,0,.1);
  --shadow-lg:0 10px 25px rgba(0,0,0,.12);

  /* Transitions */
  --transition-fast:150ms ease;
  --transition-normal:250ms ease;
}

/* ─── 3. Layout Container ─── */
.container{max-width:1280px;margin:0 auto;padding:0 24px}

/* ─── 4. Top Bar (V5.1.2: clean class-based, no inline styles) ─── */
.top-bar{background:var(--c-topbar-bg);color:#fff;padding:6px 24px;display:flex;justify-content:space-between;align-items:center;font-size:12px;flex-wrap:wrap;gap:8px}
.top-bar a{color:rgba(255,255,255,.6);text-decoration:none;transition:color var(--transition-fast)}
.top-bar a:hover{color:#fff}
.top-bar-left{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.top-bar-right{display:flex;gap:8px;align-items:center}
.top-bar-welcome{color:rgba(255,255,255,.45);font-size:12px}
.top-bar-email{font-size:12px}
.top-bar-wa{color:var(--c-whatsapp)!important;font-size:12px}
.top-bar-rfq{color:var(--c-cta)!important;font-weight:600;font-size:12px}
.top-bar-sitemap{color:rgba(255,255,255,.4);padding:2px 6px;font-size:11px}

/* ─── 5. Main Header (V5.1.2: 3-Layer — TopBar + WhiteSearchRow + DarkNav) ─── */
.main-header{position:sticky;top:0;z-index:1000;background:#fff;box-shadow:0 8px 24px rgba(15,23,42,.08)}
.header-search-row{background:#FFFFFF;border-bottom:1px solid var(--c-border-light)}
.header-inner{max-width:1280px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.header-logo{height:40px;width:auto;object-fit:contain}
.header-logo-link{display:inline-flex;align-items:center;text-decoration:none;flex-shrink:0}

/* ─── 6. Search Bar (V5.1.2: white background, dark text, max-width 600px header / 860px hero) ─── */
.header-search{flex:1;min-width:280px;max-width:860px;padding:10px 16px;border-radius:8px;border:1px solid var(--c-border);background:#F9FAFB;color:var(--c-text);font-size:14px;outline:none;transition:all var(--transition-fast)}
.header-search::placeholder{color:var(--c-text-muted)}
.header-search:focus{border-color:var(--c-accent);box-shadow:0 0 0 3px rgba(0,166,153,.12);background:#fff}

.header-actions{display:flex;gap:8px;align-items:center}
.header-trust-actions{display:flex;gap:8px;font-weight:500}
.header-trust-action{display:inline-flex;align-items:center;justify-content:center;width:110px;height:40px;font-size:11px;color:var(--c-text-sec);text-decoration:none;border:1px solid var(--c-border);border-radius:6px;transition:all var(--transition-fast);white-space:nowrap}
.header-trust-action:hover{color:var(--c-accent);border-color:var(--c-accent);background:rgba(0,166,153,.04)}
.header-sell-points{display:flex;gap:12px;font-size:11px;color:var(--c-text-sec);font-weight:500}
.header-sell-points span{white-space:nowrap}
.header-btn{padding:10px 20px;border-radius:8px;text-decoration:none;font-weight:700;font-size:13px;white-space:nowrap;border:none;cursor:pointer;transition:all var(--transition-fast)}
.header-btn-green{background:var(--c-cta);color:#fff}
.header-btn-green:hover{background:var(--c-cta-hover);transform:translateY(-1px)}
.header-btn-wa{background:var(--c-whatsapp);color:#fff;padding:10px 14px}
.header-btn-wa:hover{background:#1EB954;transform:translateY(-1px)}

/* ─── 7. Main Navigation (V5.1.2: #061A2F dark bg) ─── */
.main-nav{background:#061A2F;border-top:1px solid rgba(255,255,255,.06);overflow-x:auto;-webkit-overflow-scrolling:touch}
.main-nav-inner{max-width:1280px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between}
.main-nav a{color:rgba(255,255,255,.65);padding:10px 14px;text-decoration:none;font-size:13px;white-space:nowrap;transition:color var(--transition-fast);flex:1;text-align:center}
.main-nav a:hover{color:#fff}

/* Nav Active State (replaces inline styles from highlightActiveNav) */
.main-nav a.nav-active{color:#fff!important;font-weight:700;padding:10px 14px;text-decoration:none;font-size:13px;white-space:nowrap;border-bottom:3px solid var(--c-accent)}

/* ─── 8. Language Switcher (V5.1: RU hidden, EN primary) ─── */
.lang-switch-active{
  background:var(--c-primary)!important;
  color:#fff!important;
  font-weight:700;
  padding:4px 10px;
  border-radius:4px;
  font-size:11px;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:4px;
  box-shadow:0 1px 3px rgba(0,0,0,.3);
}
.lang-switch-inactive{
  background:transparent!important;
  color:rgba(255,255,255,.5)!important;
  padding:4px 10px;
  border-radius:4px;
  font-size:11px;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:4px;
  transition:all var(--transition-fast);
}
.lang-switch-inactive:hover{
  color:#fff!important;
  background:rgba(10,37,64,.5)!important;
}
/* V5.1: Hidden language switch button (noindex strategy — RU switcher hidden) */
.lang-switch-hidden{display:none!important}

/* ─── Homepage Hero Search Bar (860px desktop) ─── */
.hero-search{
  max-width:860px;
  min-height:56px;
  padding:14px 24px;
  border-radius:12px;
  border:2px solid rgba(255,255,255,.2);
  background:rgba(255,255,255,.08);
  color:#fff;
  font-size:16px;
  outline:none;
  transition:border-color var(--transition-fast);
  width:100%;
}
.hero-search::placeholder{color:rgba(255,255,255,.4)}
.hero-search:focus{border-color:var(--c-accent);box-shadow:0 0 0 3px rgba(0,166,153,.2)}

/* ─── 9. Footer ─── */
/* ─── 9. Footer (v5.1.2 — 5-col + #CBD5E1/#E2E8F0 palette) ─── */
.main-footer{background:var(--c-dark);color:#94A3B8;padding:48px 24px 24px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1fr;gap:32px 28px;padding-bottom:36px}
.footer-col h4{color:#E2E8F0;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;margin:0 0 16px;border:none;padding:0}
.footer-col a{display:block;color:#CBD5E1;font-size:13px;text-decoration:none;margin-bottom:8px;transition:color var(--transition-fast)}
.footer-col a:hover{color:#E2E8F0}
.footer-col--brand{padding-right:16px}
.footer-logo{margin-bottom:14px}
.footer-desc{font-size:13px;line-height:1.8;color:#94A3B8;margin-bottom:14px}
.footer-contact-list{display:flex;flex-direction:column;gap:8px}
.footer-contact-link{display:inline-flex;align-items:center;gap:4px;font-size:13px;color:#CBD5E1;text-decoration:none}
.footer-contact-wa{color:#25D366!important;font-weight:600}
.footer-contact-link:hover{color:#E2E8F0}
.footer-cta{display:grid;grid-template-columns:minmax(220px,1fr) minmax(360px,560px) auto;align-items:center;gap:24px;padding:24px 28px;background:rgba(255,255,255,.06);border-radius:12px;margin-bottom:24px;flex-wrap:wrap}
.footer-cta-title{color:#fff;font-size:16px;font-weight:700;margin-bottom:4px}
.footer-cta-sub{color:#94A3B8;font-size:13px}
.footer-cta-actions{display:flex;gap:10px;flex-wrap:wrap}
.footer-trust-logos{display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:nowrap}
.footer-trust-logo{display:inline-flex;align-items:center;justify-content:center;height:28px;min-width:56px;max-width:72px;padding:0;border-radius:6px;background:#FFFFFF;border:1px solid rgba(255,255,255,.12);box-shadow:0 2px 8px rgba(0,0,0,.12);overflow:hidden}
.footer-trust-logo img{max-height:24px;width:auto;max-width:64px;object-fit:contain;background:#fff;border-radius:6px;display:block}
.footer-cta-btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;border-radius:8px;font-weight:700;font-size:14px;text-decoration:none;transition:all var(--transition-fast)}
.footer-cta-btn--primary{background: #0F7CCF;color:#fff}
.footer-cta-btn--primary:hover{background:#005F99;transform:translateY(-1px);box-shadow:0 4px 12px rgba(15,124,207,.3)}
.footer-cta-btn--wa{background:#25D366;color:#fff}
.footer-cta-btn--wa:hover{background:#1EB954;transform:translateY(-1px);box-shadow:0 4px 12px rgba(37,211,102,.3)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:18px;display:flex;justify-content:space-between;align-items:flex-start;gap:24px;flex-wrap:wrap}
.footer-bottom-left{font-size:12px;color:#64748B;white-space:nowrap}
.footer-bottom-trademark{font-size:11px;color:#475569;line-height:1.6;max-width:640px}

/* ─── 10. WhatsApp Float ─── */
.wa-float{position:fixed;bottom:24px;right:24px;width:56px;height:56px;background:var(--c-whatsapp);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(0,0,0,.3);z-index:9999;text-decoration:none;font-size:24px}

/* ─── 11. Mobile Bottom Bar ─── */
.mobile-bar{display:none;position:fixed;bottom:0;left:0;right:0;background:var(--c-dark);padding:8px 0;z-index:9998;border-top:1px solid rgba(255,255,255,.1)}
.mobile-bar-inner{display:flex;justify-content:space-around;align-items:center}
.mobile-bar a{text-decoration:none;font-size:11px;font-weight:600;text-align:center;color:rgba(255,255,255,.7)}

/* ─── 12. Responsive Breakpoints ─── */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:24px}
  .footer-col:nth-child(4),.footer-col:nth-child(5){display:none}
}
@media(max-width:768px){
  .mobile-hide{display:none!important}
  .mobile-bar{display:block!important}
  .wa-float{bottom:72px!important}
  .footer-grid{grid-template-columns:1fr 1fr;gap:20px}
  .footer-col:nth-child(4),.footer-col:nth-child(5){display:block}
  .footer-cta{flex-direction:column;text-align:center;grid-template-columns:1fr;gap:16px}
  .footer-trust-logos{justify-content:center;gap:8px;margin:0}
  .footer-trust-logo,.footer-trust-logo img{height:26px;max-width:60px}
  .footer-cta-actions{justify-content:center}
  .footer-bottom{flex-direction:column;text-align:center}
  .main-footer{padding:32px 16px 16px}
}
@media(max-width:640px){
  .header-inner{padding:10px 16px;gap:10px}
  .header-search{min-width:180px}
  .top-bar{padding:4px 12px;font-size:11px}
  .header-search-row{border-bottom:1px solid var(--c-border)}
}

/* ─── 13. Utility: Datasheet / Technical Support Button ─── */
.v4-btn-datasheet{
  display:inline-flex;align-items:center;gap:6px;
  background:var(--c-primary);color:#fff;
  padding:10px 22px;border-radius:var(--radius);
  font-weight:700;font-size:13px;
  border:none;cursor:pointer;text-decoration:none;
  transition:all var(--transition-fast);
  box-shadow:var(--shadow);
}
.v4-btn-datasheet:hover{
  background:var(--c-primary-light);
  transform:translateY(-1px);
  box-shadow:var(--shadow-md);
}

/* ─── 14. Breadcrumb (Enhanced 3-level) ─── */
.v4-bc{max-width:1280px;margin:0 auto;padding:16px 24px 8px;font-size:13px;color:var(--c-text-sec)}
.v4-bc a{color:var(--c-text-sec);text-decoration:none;transition:color var(--transition-fast)}
.v4-bc a:hover{color:var(--c-accent)}
.v4-bc .sep{margin:0 6px;color:#CBD5E1}
.v4-bc .current{color:var(--c-text);font-weight:600}

/* ─── 15. PDP RFQ Section Layout (V5.1.6L) ─── */
.pdp-rfq-section{
  margin:48px auto;max-width:1280px;padding:36px 40px;
  background:#063763;border-radius:16px;color:#fff;
  box-shadow:0 12px 32px rgba(10,37,64,.16);
}
.pdp-rfq-head{margin-bottom:24px}
.pdp-rfq-head h2{font-size:26px;line-height:1.25;font-weight:800;margin-bottom:10px}
.pdp-rfq-head p{font-size:15px;color:rgba(255,255,255,.78);margin-bottom:16px}
.pdp-rfq-badges{display:flex;flex-wrap:wrap;gap:10px}
.pdp-rfq-badges span{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:34px;padding:0 16px;border-radius:7px;
  background:rgba(255,255,255,.12);color:#fff;font-size:13px;font-weight:700;
}
.pdp-rfq-grid{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(420px,520px);
  gap:32px;align-items:stretch;
}
.pdp-certification-visual{
  width:100%;min-height:360px;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);
  border-radius:14px;padding:24px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
}
.pdp-certification-visual img{
  width:100%;max-width:560px;max-height:280px;
  object-fit:contain;display:block;border-radius:10px;background:#fff;
}
.pdp-certification-visual p{
  margin-top:14px;font-size:13px;line-height:1.5;
  color:rgba(255,255,255,.8);text-align:center;
}
.pdp-quick-quote-form,.quick-quote-form{
  width:100%;min-height:360px;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);
  border-radius:14px;padding:24px;
}
.pdp-quick-quote-form h3,.quick-quote-form h3{font-size:14px;font-weight:700;margin-bottom:10px}
.v4-rfq-row{display:flex;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.v4-rfq-field{flex:1;display:flex;flex-direction:column;gap:3px;min-width:100px}
.v4-rfq-field label{font-size:10px;color:rgba(255,255,255,.6);font-weight:600;text-transform:uppercase;letter-spacing:.3px}
.v4-rfq-field input,.v4-rfq-field textarea{width:100%;padding:8px 10px;border:1px solid rgba(255,255,255,.15);border-radius:6px;font-size:13px;outline:none;background:rgba(255,255,255,.08);color:#fff;font-family:inherit}
.v4-rfq-field input:focus,.v4-rfq-field textarea:focus{border-color:var(--c-accent);box-shadow:0 0 0 2px rgba(0,166,153,.2)}
.v4-rfq-submit{width:100%;padding:10px;background:var(--c-accent);color:#fff;border:none;border-radius:6px;font-weight:700;font-size:14px;cursor:pointer;transition:all .15s;margin-top:4px}
@media(max-width:900px){
  .pdp-rfq-section{padding:28px 20px}
  .pdp-rfq-grid{grid-template-columns:1fr;gap:20px}
  .pdp-certification-visual,.pdp-quick-quote-form,.quick-quote-form{min-height:auto}
  .pdp-certification-visual img{max-height:220px}
  .v4-rfq-submit{width:100%}
}