/* ═══════════════════════════════════════════════════════════════
   MFDTools Design System v3
   Enterprise-grade brand system for all product pages
   Colors sourced from BlueTeal logo palette
   ═══════════════════════════════════════════════════════════════ */

:root{
  /* Brand */
  --brand-navy:#0F2A6E;
  --brand-blue:#1E40AF;
  --brand-royal:#3B82F6;
  --brand-teal:#0891B2;
  --brand-cyan:#06B6D4;

  /* Neutrals (slate scale) */
  --ink:#0F172A;
  --text:#334155;
  --muted:#64748B;
  --subtle:#94A3B8;
  --line:#E2E8F0;
  --line-strong:#CBD5E1;
  --surface:#F8FAFC;
  --surface-2:#F1F5F9;
  --white:#FFFFFF;

  /* Accents */
  --gold:#F59E0B;
  --gold-light:#FBBF24;
  --emerald:#10B981;
  --rose:#F43F5E;

  /* Radii */
  --r-sm:6px; --r-md:10px; --r-lg:16px; --r-xl:24px; --r-full:999px;

  /* Shadows */
  --shadow-xs:0 1px 2px rgba(15,42,110,.05);
  --shadow-sm:0 2px 4px rgba(15,42,110,.06),0 4px 8px rgba(15,42,110,.04);
  --shadow-md:0 6px 12px rgba(15,42,110,.08),0 10px 24px rgba(15,42,110,.06);
  --shadow-lg:0 12px 24px rgba(15,42,110,.10),0 24px 48px rgba(15,42,110,.08);
  --shadow-xl:0 24px 48px rgba(15,42,110,.14),0 40px 80px rgba(15,42,110,.10);

  /* Fonts */
  --f-display:'Space Grotesk','Inter',system-ui,sans-serif;
  --f-body:'Inter',system-ui,-apple-system,sans-serif;

  /* Container */
  --container:1200px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--f-body);color:var(--text);background:var(--white);
  font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:var(--brand-blue);text-decoration:none;transition:color .15s}
a:hover{color:var(--brand-navy)}
button{font-family:inherit;cursor:pointer;border:0;background:none}

.container{max-width:var(--container);margin:0 auto;padding:0 24px}

/* ═══ Typography ═══ */
h1,h2,h3,h4{font-family:var(--f-display);color:var(--ink);font-weight:700;letter-spacing:-.02em;line-height:1.15}
h1{font-size:clamp(36px,5vw,64px);font-weight:700;letter-spacing:-.03em}
h2{font-size:clamp(28px,3.4vw,44px);font-weight:700}
h3{font-size:22px;font-weight:700}
h4{font-size:17px;font-weight:600}

.eyebrow{display:inline-block;font-family:var(--f-body);font-size:12px;font-weight:700;color:var(--brand-blue);letter-spacing:.14em;text-transform:uppercase;margin-bottom:16px}
.lead{font-size:19px;color:var(--muted);line-height:1.6;max-width:620px}
@media(max-width:640px){.lead{font-size:17px}}

/* ═══ Buttons ═══ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 26px;border-radius:var(--r-full);font-weight:600;font-size:15px;transition:all .18s;text-decoration:none;font-family:inherit;line-height:1;white-space:nowrap}
.btn-primary{background:var(--ink);color:#fff;box-shadow:var(--shadow-md)}
.btn-primary:hover{background:var(--brand-navy);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-lg)}
.btn-gold{background:linear-gradient(135deg,var(--gold),#D97706);color:var(--ink);box-shadow:0 8px 22px rgba(245,158,11,.30)}
.btn-gold:hover{transform:translateY(-1px);box-shadow:0 12px 30px rgba(245,158,11,.45);color:var(--ink)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line-strong)}
.btn-ghost:hover{border-color:var(--ink);background:var(--surface)}
.btn-lg{padding:16px 32px;font-size:16px}
.btn svg{width:16px;height:16px}

/* ═══ Navigation ═══ */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:32px}
.nav-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--ink);font-family:var(--f-display)}
.nav-brand img{width:36px;height:36px;border-radius:8px}
.nav-brand em{color:var(--brand-blue);font-style:normal;font-weight:700}
.nav-links{display:flex;align-items:center;gap:6px;font-size:14.5px;font-weight:500}
.nav-item{position:relative}
.nav-item>a,.nav-item>button{display:inline-flex;align-items:center;gap:5px;padding:10px 14px;color:var(--text);border-radius:8px;font-weight:500;transition:all .15s}
.nav-item>a:hover,.nav-item>button:hover{background:var(--surface);color:var(--ink)}
.nav-item.active>a,.nav-item.active>button{color:var(--brand-blue);font-weight:600}
.nav-item .caret{transition:transform .2s}
.nav-item:hover .caret{transform:rotate(180deg)}
.nav-dropdown{position:absolute;top:calc(100% + 8px);left:-20px;min-width:340px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:12px;box-shadow:var(--shadow-lg);opacity:0;visibility:hidden;transform:translateY(-8px);transition:all .18s;z-index:10}
.nav-item:hover .nav-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.nav-dropdown a{display:flex;align-items:flex-start;gap:12px;padding:12px;border-radius:10px;color:var(--text);transition:background .12s}
.nav-dropdown a:hover{background:var(--surface)}
.nav-dropdown .di{width:36px;height:36px;background:linear-gradient(135deg,#DBEAFE,#93C5FD);border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--brand-blue)}
.nav-dropdown .dt{font-weight:600;color:var(--ink);font-size:14px;margin-bottom:2px}
.nav-dropdown .ds{font-size:12.5px;color:var(--muted);line-height:1.45}
.nav-cta{display:flex;gap:10px;align-items:center}
.nav-login{color:var(--ink);font-weight:600;font-size:14.5px;padding:8px 14px;border-radius:8px}
.nav-login:hover{background:var(--surface)}
.nav-toggle{display:none;width:40px;height:40px;background:none;border:0;color:var(--ink);align-items:center;justify-content:center;z-index:101}
.nav-toggle svg{width:22px;height:22px}
.nav-toggle .icon-close{display:none}
body.mobile-nav-open .nav-toggle .icon-open{display:none}
body.mobile-nav-open .nav-toggle .icon-close{display:block}
@media(max-width:960px){
  .nav-toggle{display:inline-flex}
  .nav-inner{height:60px}

  /* Default: hide desktop nav on mobile */
  .nav-links{display:none}
  .nav-cta .btn{display:none}

  /* ═══ MOBILE MENU OPEN STATE ═══ */
  body.mobile-nav-open{overflow:hidden}
  /* CRITICAL: backdrop-filter on .nav creates stacking context that breaks
     position:fixed on children. Remove during menu-open state so overlay
     children position relative to viewport, not the nav. */
  body.mobile-nav-open .nav{
    background:#fff;
    backdrop-filter:none;
    -webkit-backdrop-filter:none
  }
  body.mobile-nav-open .nav-links{
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    position:fixed;top:60px;left:0;right:0;bottom:0;
    background:#fff;padding:20px 20px 40px;
    overflow-y:auto;z-index:99;
    animation:slideDown .22s ease-out
  }
  body.mobile-nav-open .nav-item{border-bottom:1px solid var(--line);padding:4px 0}
  body.mobile-nav-open .nav-item:last-child{border-bottom:0}
  body.mobile-nav-open .nav-item>a,
  body.mobile-nav-open .nav-item>button{
    width:100%;padding:16px 8px;font-size:16px;font-weight:600;
    justify-content:space-between;color:var(--ink);border-radius:0
  }
  body.mobile-nav-open .nav-item>button{background:none}
  body.mobile-nav-open .nav-item .caret{transform:rotate(0deg);transition:transform .18s}
  body.mobile-nav-open .nav-item.mobile-open .caret{transform:rotate(180deg)}

  /* Mobile dropdown: expand inline, don't float */
  body.mobile-nav-open .nav-dropdown{
    position:static;opacity:1;visibility:visible;transform:none;
    box-shadow:none;border:0;border-radius:0;padding:0 0 12px 8px;
    min-width:0;background:transparent;
    display:none
  }
  body.mobile-nav-open .nav-item.mobile-open .nav-dropdown{display:block}
  body.mobile-nav-open .nav-dropdown a{padding:10px 8px}
  body.mobile-nav-open .nav-dropdown .dt{font-size:14px}
  body.mobile-nav-open .nav-dropdown .ds{font-size:12px}

  /* Show mobile CTA at bottom of open menu — respects iPhone home indicator */
  body.mobile-nav-open .nav-cta{
    display:flex;flex-direction:column;gap:10px;
    margin-top:20px;padding-top:20px;border-top:1px solid var(--line);
    order:99;position:fixed;left:20px;right:20px;
    bottom:calc(24px + env(safe-area-inset-bottom));
    background:#fff;z-index:100
  }
  body.mobile-nav-open .nav-cta .btn,
  body.mobile-nav-open .nav-cta .nav-login{
    display:flex;justify-content:center;width:100%;padding:14px
  }
  body.mobile-nav-open .nav-cta .nav-login{background:var(--surface);border-radius:var(--r-full)}
  /* Extra bottom padding on menu links so last item isn't hidden behind CTA */
  body.mobile-nav-open .nav-links{
    padding-bottom:calc(160px + env(safe-area-inset-bottom))
  }
}
@keyframes slideDown{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:translateY(0)}
}

/* ═══ Section Base ═══ */
.section{padding:100px 0;position:relative}
.section-head{max-width:720px;margin:0 auto 56px;text-align:center}
.section-head .eyebrow{margin-bottom:12px}
.section-head h2{margin-bottom:16px}
.section-head p{color:var(--muted);font-size:17px;line-height:1.6}
@media(max-width:640px){.section{padding:64px 0}.section-head{margin-bottom:40px}}

/* ═══ Page Hero (non-home) ═══ */
.page-hero{padding:80px 0 60px;background:linear-gradient(180deg,var(--surface) 0%,#fff 100%);text-align:center;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;top:-150px;right:-100px;width:500px;height:500px;background:radial-gradient(circle,rgba(8,145,178,.06),transparent 65%);border-radius:50%;pointer-events:none}
.page-hero .container{position:relative}
.page-hero h1{margin-bottom:20px;max-width:820px;margin-left:auto;margin-right:auto}
.page-hero h1 .grad{background:linear-gradient(135deg,var(--brand-navy),var(--brand-teal));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.page-hero .lead{margin:0 auto;font-size:19px}
.page-hero-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;background:#fff;border:1px solid var(--line);border-radius:var(--r-full);font-size:13px;font-weight:600;color:var(--brand-navy);margin-bottom:24px;box-shadow:var(--shadow-xs)}
.page-hero-badge .dot{width:8px;height:8px;background:var(--emerald);border-radius:50%;box-shadow:0 0 0 3px rgba(16,185,129,.25)}
@media(max-width:640px){.page-hero{padding:56px 0 40px}}

/* ═══ CTA Band ═══ */
.cta-band{padding:100px 0;background:linear-gradient(135deg,var(--brand-navy) 0%,var(--brand-blue) 50%,var(--brand-teal) 100%);color:#fff;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;top:-200px;right:-100px;width:500px;height:500px;background:radial-gradient(circle,rgba(255,255,255,.15),transparent 65%);border-radius:50%;pointer-events:none}
.cta-band::after{content:"";position:absolute;bottom:-150px;left:-100px;width:400px;height:400px;background:radial-gradient(circle,rgba(252,211,77,.20),transparent 65%);border-radius:50%;pointer-events:none}
.cta-band-inner{position:relative;text-align:center;max-width:720px;margin:0 auto}
.cta-band h2{color:#fff;margin-bottom:16px;font-size:44px}
.cta-band p{color:rgba(255,255,255,.88);font-size:18px;margin-bottom:32px;line-height:1.6}
.cta-band .cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.cta-band .btn-primary{background:#fff;color:var(--ink)}
.cta-band .btn-primary:hover{background:var(--surface);color:var(--ink)}
.cta-band .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.1);border-color:#fff;color:#fff}
@media(max-width:640px){.cta-band{padding:60px 0}.cta-band h2{font-size:30px}.cta-band p{font-size:16px}}

/* ═══ Footer ═══ */
.footer{background:var(--ink);color:#94A3B8;padding:70px 0 30px}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:32px;margin-bottom:48px}
.footer-brand{max-width:280px}
.footer-brand-mark{display:flex;align-items:center;gap:10px;margin-bottom:16px;font-family:var(--f-display);font-size:20px;font-weight:700;color:#fff}
.footer-brand-mark img{width:32px;height:32px;border-radius:7px}
.footer-brand-mark em{color:#3B82F6;font-style:normal}
.footer-brand p{font-size:13.5px;line-height:1.6;color:#94A3B8;margin-bottom:20px}
.footer-brand .fb-social{display:flex;gap:10px}
.footer-brand .fb-social a{width:36px;height:36px;background:rgba(255,255,255,.06);border-radius:8px;display:flex;align-items:center;justify-content:center;color:#CBD5E1;transition:all .15s}
.footer-brand .fb-social a:hover{background:rgba(255,255,255,.12);color:#fff}
.footer-brand .fb-social svg{width:16px;height:16px}
.footer-col h4{color:#fff;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px}
.footer-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.footer-col a{color:#94A3B8;font-size:14px;transition:color .12s}
.footer-col a:hover{color:#fff}
.footer-bottom{padding-top:24px;border-top:1px solid rgba(255,255,255,.08);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;font-size:12.5px;color:#64748B}
.footer-bottom a{color:#94A3B8}
.footer-bottom .fb-legal{display:flex;gap:20px;flex-wrap:wrap}
@media(max-width:900px){
  .footer-top{grid-template-columns:1fr 1fr;gap:36px}
  .footer-brand{grid-column:1 / -1}
}
@media(max-width:520px){
  .footer-top{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* ═══ Utilities ═══ */
.text-center{text-align:center}
.mb-2{margin-bottom:16px}
.mb-3{margin-bottom:24px}