/* ==========================================================================
   Omega Chemist — Design System
   Accessible, fast, dependency-free CSS. No render-blocking webfonts.
   ========================================================================== */

:root{
  --color-bg:#ffffff;
  --color-bg-alt:#f4f8fb;
  --color-bg-dark:#0b2540;
  --color-primary:#0b63b8;
  --color-primary-dark:#084a8a;
  --color-accent:#1fa35c;
  --color-accent-dark:#167a44;
  --color-text:#152233;
  --color-text-muted:#4d5f72;
  --color-border:#dde6ee;
  --color-warning-bg:#fff6e5;
  --color-warning-border:#f0c36d;
  --color-warning-text:#6b4d05;
  --radius:10px;
  --max-width:1180px;
  --shadow-sm:0 1px 2px rgba(11,37,64,.06);
  --shadow-md:0 6px 20px rgba(11,37,64,.08);
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  color:var(--color-text);
  background:var(--color-bg);
  line-height:1.65;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--color-primary);text-decoration:none}
a:hover,a:focus{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;margin:0 0 .6em;font-weight:700;color:var(--color-bg-dark)}
h1{font-size:clamp(1.9rem,3.2vw,2.75rem)}
h2{font-size:clamp(1.4rem,2.2vw,1.9rem);margin-top:2.2em}
h3{font-size:1.2rem;margin-top:1.6em}
p{margin:0 0 1.1em}
ul,ol{margin:0 0 1.1em;padding-left:1.3em}
li{margin-bottom:.4em}
.container{max-width:var(--max-width);margin:0 auto;padding:0 20px}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link{position:absolute;left:-9999px;top:0;background:#fff;padding:10px 16px;z-index:1000;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* Accessibility: a clear, consistent focus indicator on every interactive
   element (WCAG 2.2 focus-visibility). We never suppress the default
   outline; this just makes it more visible/consistent across browsers and
   over custom-colored buttons/cards. */
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,
textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{
  outline:3px solid var(--color-accent);
  outline-offset:2px;
  border-radius:2px;
}

/* Header */
.site-header{border-bottom:1px solid var(--color-border);background:#fff;position:sticky;top:0;z-index:500}
.site-header .container{display:flex;align-items:center;justify-content:space-between;padding-top:14px;padding-bottom:14px;gap:20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;color:var(--color-bg-dark)}
.brand small{display:block;font-weight:500;font-size:.68rem;color:var(--color-text-muted);letter-spacing:.03em}
.main-nav{display:flex;gap:18px;flex-wrap:wrap;align-items:center}
.main-nav a{color:var(--color-text);font-size:.94rem;font-weight:600}
.main-nav a:hover{color:var(--color-primary)}
.header-cta{display:flex;gap:10px;align-items:center}

/* Mobile nav toggle (hamburger). Hidden entirely on desktop; on mobile it
   becomes a real button that shows/hides .main-nav — see assets/js/main.js.
   Without this, .main-nav is unreachable below 760px, which would leave
   mobile visitors with no way to navigate the site from the header at all. */
.nav-toggle{display:none;width:40px;height:40px;border:1px solid var(--color-border);border-radius:8px;background:#fff;cursor:pointer;position:relative;flex-shrink:0}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:9px;right:9px;height:2px;background:var(--color-bg-dark);border-radius:2px}
.nav-toggle span{top:19px}
.nav-toggle span::before{top:-7px}
.nav-toggle span::after{top:7px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-7px) rotate(-45deg)}

.btn{display:inline-block;padding:11px 20px;border-radius:8px;font-weight:700;font-size:.95rem;border:2px solid transparent;cursor:pointer}
.btn-primary{background:var(--color-primary);color:#fff}
.btn-primary:hover{background:var(--color-primary-dark);text-decoration:none}
.btn-accent{background:var(--color-accent-dark);color:#fff}
.btn-accent:hover{background:#125c35;text-decoration:none}
.btn-outline{background:transparent;border-color:var(--color-primary);color:var(--color-primary)}
.btn-outline:hover{background:var(--color-primary);color:#fff;text-decoration:none}
.btn-sm{padding:7px 14px;font-size:.85rem}

/* Hero */
.hero{background:linear-gradient(155deg,var(--color-bg-dark),#123a63);color:#fff;padding:56px 0;background-size:cover;background-position:center}
.hero h1{color:#fff}
.hero p.lead{font-size:1.15rem;color:#cfe0f0;max-width:64ch}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.hero-badges{display:flex;gap:22px;flex-wrap:wrap;margin-top:30px;color:#bcd4ea;font-size:.85rem}
.hero-badges strong{display:block;color:#fff;font-size:1.05rem}

/* Sections */
section{padding:48px 0}
.section-alt{background:var(--color-bg-alt)}
.section-head{max-width:70ch;margin-bottom:28px}
.section-head p{color:var(--color-text-muted)}

/* Cards / grids */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.card{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm)}
.card h3{margin-top:0}
.product-card img{border-radius:8px;margin-bottom:14px;background:var(--color-bg-alt)}
.stat{text-align:center;padding:18px}
.stat strong{display:block;font-size:1.8rem;color:var(--color-primary)}
.stat span{color:var(--color-text-muted);font-size:.85rem}

/* Tables */
table{width:100%;border-collapse:collapse;margin:1.4em 0;font-size:.95rem}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--color-border)}
th{background:var(--color-bg-alt);font-weight:700}

/* FAQ */
.faq-item{border-bottom:1px solid var(--color-border);padding:16px 0}
.faq-item summary{font-weight:700;cursor:pointer;color:var(--color-bg-dark)}
.faq-item[open] summary{color:var(--color-primary)}
.faq-item p{margin-top:10px;color:var(--color-text-muted)}

/* Disclaimer / trust */
.disclaimer{background:var(--color-warning-bg);border:1px solid var(--color-warning-border);color:var(--color-warning-text);border-radius:var(--radius);padding:18px 20px;font-size:.9rem;margin:24px 0}
.disclaimer strong{display:block;margin-bottom:6px}
.trust-strip{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;background:var(--color-bg-alt);border-top:1px solid var(--color-border);border-bottom:1px solid var(--color-border);padding:18px 0}
.trust-strip span{font-size:.85rem;font-weight:600;color:var(--color-text-muted);display:flex;align-items:center;gap:6px}

/* Breadcrumb */
.breadcrumb{font-size:.82rem;color:var(--color-text-muted);padding:14px 0}
.breadcrumb a{color:var(--color-text-muted)}
.breadcrumb span[aria-current]{color:var(--color-text)}

/* Directory lists */
.directory-list{columns:4 180px;column-gap:24px}
.directory-list li{break-inside:avoid;margin-bottom:6px}
@media (max-width:760px){.directory-list{columns:2 140px}}

/* Forms */
form.lead-form{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}
form.lead-form label{display:block;font-weight:600;font-size:.88rem;margin:14px 0 6px}
form.lead-form input,form.lead-form select,form.lead-form textarea{width:100%;padding:10px 12px;border:1px solid var(--color-border);border-radius:8px;font-size:.95rem;font-family:inherit}
form.lead-form button{margin-top:18px}

/* Footer */
.site-footer{background:var(--color-bg-dark);color:#c7d7e6;padding:48px 0 24px;margin-top:40px}
.site-footer a{color:#e7f0f8}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:26px;margin-bottom:30px}
.footer-grid h4{color:#fff;font-size:.92rem;margin-bottom:12px}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin-bottom:7px;font-size:.88rem}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;font-size:.8rem;color:#93a8bc}
.footer-disclaimer{font-size:.78rem;color:#93a8bc;max-width:90ch;margin-bottom:18px}

/* Sticky contact */
.sticky-contact{position:fixed;bottom:18px;right:18px;display:flex;flex-direction:column;gap:10px;z-index:600}
.sticky-contact a{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);font-size:1.3rem;color:#fff}
.sticky-contact .call{background:var(--color-primary)}
.sticky-contact .whatsapp{background:#25D366}
.sticky-contact .quote{background:var(--color-accent)}

/* Utility */
.text-muted{color:var(--color-text-muted)}
.mt-0{margin-top:0}
.two-col{display:grid;grid-template-columns:2fr 1fr;gap:36px}
@media (max-width:860px){.two-col{grid-template-columns:1fr}}
.badge{display:inline-block;background:var(--color-bg-alt);color:var(--color-primary);font-size:.78rem;font-weight:700;padding:4px 10px;border-radius:999px;margin:0 6px 6px 0}
.toc{background:var(--color-bg-alt);border-radius:var(--radius);padding:18px 22px;font-size:.9rem}
.toc a{display:block;padding:3px 0}

@media (max-width:760px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--color-border);flex-direction:column;align-items:flex-start;gap:2px;padding:10px 20px 16px;box-shadow:var(--shadow-md)}
  .main-nav.open{display:flex}
  .main-nav a{padding:10px 4px;width:100%}
  .site-header .container{position:relative}
  .two-col{grid-template-columns:1fr}
}

/* Newsletter (footer) */
.newsletter-form{margin-top:14px}
.newsletter-form label{display:block;font-size:.85rem;font-weight:600;margin-bottom:8px;color:#fff}
.newsletter-form input{flex:1;padding:9px 11px;border-radius:8px;border:1px solid rgba(255,255,255,.25);font-size:.9rem}
.form-inline-msg{color:var(--color-accent-dark)}
.footer-grid .newsletter-form .form-inline-msg{color:#8be3ac}

/* Category hub cards */
.category-card{border-left:4px solid var(--color-accent)}
.category-card .products-used{font-size:.85rem;color:var(--color-text-muted);margin-top:8px}

/* Dosage calculator tool */
.calc-tool{background:#fff;border:1px solid var(--color-border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm);max-width:640px}
.calc-tool label{display:block;font-weight:600;font-size:.88rem;margin:14px 0 6px}
.calc-tool select,.calc-tool input{width:100%;padding:10px 12px;border:1px solid var(--color-border);border-radius:8px;font-size:.95rem;font-family:inherit}
.calc-result{margin-top:20px;padding:18px 20px;border-radius:var(--radius);background:var(--color-bg-alt);border:1px solid var(--color-border);display:none}
.calc-result.visible{display:block}
.calc-result h3{margin-top:0}

/* Site search */
.search-box{max-width:520px}
.search-box input{width:100%;padding:12px 14px;border:1px solid var(--color-border);border-radius:8px;font-size:1rem}
.search-results{margin-top:20px;display:grid;gap:12px}
.search-results .card{padding:16px 18px}
.search-empty{color:var(--color-text-muted);margin-top:16px}

/* Image gallery captions */
.brand-gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin:20px 0}
.brand-gallery figure{margin:0}
.brand-gallery img{width:100%;height:160px;object-fit:cover;border-radius:8px;border:1px solid var(--color-border)}
.brand-gallery figcaption{font-size:.8rem;color:var(--color-text-muted);margin-top:6px;text-align:center}