/* ---------- Tokens ---------- */
:root{
  --paper: #F2F4F1;
  --panel: #FFFFFF;
  --ink: #12161A;
  --muted: #5B6560;
  --line: rgba(18,22,26,0.10);
  --line-strong: rgba(18,22,26,0.22);
  --signal: #2A4CFF;
  --signal-dark: #1F38C7;
  --amber: #E08A2C;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Manrope', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --max: 1180px;
}

*,*::before,*::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *,*::before,*::after{ animation-duration:0.001ms !important; transition-duration:0.001ms !important; }
}

body{
  margin:0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img,svg{ display:block; max-width:100%; }
a{ color:inherit; }

.wrap{ max-width: var(--max); margin:0 auto; padding: 0 32px; }

.sr-only{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
.skip-link{
  position:absolute; left:-999px; top:0; background:var(--ink); color:#fff;
  padding:12px 18px; z-index:200;
}
.skip-link:focus{ left:16px; top:16px; }
:focus-visible{ outline: 2px solid var(--signal); outline-offset:3px; }

h1,h2,h3{
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 0.4em;
  letter-spacing: -0.01em;
}
p{ margin:0 0 1em; max-width: 60ch; color: var(--muted); }

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--signal);
  margin: 0 0 0.9em;
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding: 14px 26px;
  font-family: var(--font-body); font-weight: 600; font-size: 0.96rem;
  border-radius: 2px;
  border: 1.5px solid transparent;
  cursor:pointer; text-decoration:none;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover{ transform: translateY(-1px); }
.btn-solid{ background: var(--ink); color: #fff; }
.btn-solid:hover{ background: var(--signal); }
.btn-outline{ background: transparent; border-color: var(--ink); color: var(--ink); }
.btn-outline:hover{ background: var(--ink); color: #fff; }
.btn-small{ padding: 9px 18px; font-size: 0.84rem; }

/* ---------- Header ---------- */
.site-header{
  position: sticky; top:0; z-index:100;
  background: rgba(242,244,241,0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.header-row{ display:flex; align-items:center; justify-content:space-between; height:80px; }
.logo{ display:flex; align-items:center; gap:9px; text-decoration:none; color:var(--ink); font-family: var(--font-display); font-size:1.25rem; font-weight:700; }
.logo-mark{ width:24px; height:24px; }
.main-nav{ display:flex; gap:28px; }
.main-nav a{ text-decoration:none; color:var(--ink); font-size:0.92rem; padding:6px 0; border-bottom:1px solid transparent; }
.main-nav a:hover{ border-bottom-color: var(--signal); }
.header-actions{ display:flex; align-items:center; gap:16px; }
.nav-toggle{ display:none; flex-direction:column; justify-content:center; gap:5px; width:38px; height:38px; background:none; border:none; cursor:pointer; }
.nav-toggle span{ display:block; height:2px; width:22px; background: var(--ink); }

/* ---------- Hero ---------- */
.hero{ padding: 74px 0 56px; }
.hero-grid{ display:grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items:center; }
.hero-title{ font-size: clamp(2.3rem, 4.6vw, 3.7rem); line-height:1.05; margin-bottom:0.4em; }
.hero-figure{ color: var(--signal); }
.hero-sub{ font-size: 1.05rem; }
.hero-cta-row{ display:flex; gap:14px; flex-wrap:wrap; margin: 24px 0 16px; }
.hero-fineprint{ font-family: var(--font-mono); font-size:0.74rem; color: var(--muted); max-width:none; }

.hero-diagram{ text-align:center; }
.hero-diagram svg{ width:100%; max-width:360px; margin:0 auto; }
.diagram-caption{ font-family: var(--font-mono); font-size:0.72rem; color: var(--muted); margin-top:10px; max-width: 320px; margin-inline:auto; }

/* ---------- Trust strip ---------- */
.trust-strip{ background: var(--ink); padding: 20px 0; }
.trust-row{ display:flex; flex-wrap:wrap; gap: 14px 34px; justify-content: space-between; }
.trust-item{ font-family: var(--font-mono); font-size:0.82rem; color: rgba(242,244,241,0.85); }

/* ---------- Sections ---------- */
.section{ padding: 96px 0; }
.section-head{ max-width: 620px; margin-bottom: 50px; }
.section-head h2{ font-size: clamp(1.9rem, 3.2vw, 2.5rem); }

/* Assay table */
.assay-section{ background: var(--panel); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.assay-grid{ display:grid; grid-template-columns: 0.8fr 1.2fr; gap: 56px; }
.assay-intro h2{ font-size: clamp(1.9rem, 3.4vw, 2.5rem); }
.assay-table{ width:100%; border-collapse: collapse; font-size:0.92rem; }
.assay-table th{
  text-align:left; font-family: var(--font-mono); font-weight:400; font-size:0.76rem;
  color: var(--muted); padding: 0 0 12px; border-bottom: 1.5px solid var(--ink);
}
.assay-table td{ padding: 16px 0; border-bottom: 1px solid var(--line); vertical-align:top; }
.assay-table td:first-child{ font-weight:600; color: var(--ink); width:38%; }
.assay-table td:nth-child(2){ font-family: var(--font-mono); color: var(--signal-dark); width:16%; }

/* Shop */
.product-row{ display:grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--line); border:1px solid var(--line); }
.product-card{ background: var(--panel); padding: 26px; display:flex; flex-direction:column; }
.product-swatch{
  height: 84px; background: var(--sw); margin-bottom:18px; position:relative;
}
.product-tag{
  position:absolute; bottom:8px; left:8px; background: rgba(255,255,255,0.92);
  font-family: var(--font-mono); font-size:0.72rem; padding:3px 8px;
}
.product-card h3{ font-size:1.15rem; margin-bottom:0.3em; }
.product-card p{ font-size:0.9rem; flex-grow:1; }
.product-foot{ display:flex; align-items:center; justify-content:space-between; padding-top:14px; margin-top:8px; border-top:1px solid var(--line); }
.product-price{ font-family: var(--font-mono); font-size:0.94rem; color: var(--ink); }
.product-price small{ color: var(--muted); }
.cart-note{ margin-top:20px; min-height:1.4em; font-family: var(--font-mono); font-size:0.84rem; color: var(--signal-dark); }

/* Calculator */
.calc-section{ background: var(--ink); }
.calc-section .eyebrow{ color: var(--amber); }
.calc-section h2, .calc-section p{ color: #fff; }
.calc-section p{ color: rgba(242,244,241,0.72); }
.calc-grid{ display:grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items:start; }
.calc-tool{ background: rgba(242,244,241,0.06); border:1px solid rgba(242,244,241,0.16); padding: 30px; }
.calc-field{ margin-bottom: 18px; display:flex; flex-direction:column; gap:8px; }
.calc-field label{ font-family: var(--font-mono); font-size:0.78rem; color: rgba(242,244,241,0.6); }
.calc-field select{
  padding: 12px 14px; font-family: var(--font-body); font-size:0.95rem;
  background: #fff; border:1px solid transparent; border-radius:2px;
}
.calc-result{
  margin-top: 20px; font-family: var(--font-mono); font-size:0.9rem;
  color: var(--amber); min-height: 1.4em;
}

/* Lab */
.lab-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items:center; }
.coa-doc{
  background:#fff; border:1px solid var(--line-strong); padding: 28px;
  font-family: var(--font-mono); font-size:0.86rem;
}
.coa-head{ display:flex; justify-content:space-between; border-bottom:1.5px solid var(--ink); padding-bottom:12px; margin-bottom:14px; font-size:0.8rem; }
.coa-row{ display:flex; justify-content:space-between; padding:8px 0; border-bottom:1px dashed var(--line); }
.coa-foot{ margin-top:14px; color: var(--muted); font-size:0.76rem; }
.batch-lookup{ display:flex; gap:10px; margin-top: 20px; }
.batch-lookup input{
  flex-grow:1; padding: 12px 14px; border:1px solid var(--line-strong); font-family: var(--font-mono); font-size:0.88rem; border-radius:2px;
}

/* Reviews */
.review-row{ display:grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--line); border:1px solid var(--line); }
.review-card{ margin:0; background: var(--panel); padding: 28px; }
.review-card blockquote{ margin:0 0 16px; font-family: var(--font-display); font-size:1.1rem; line-height:1.4; color: var(--ink); font-weight:500; }
.review-card figcaption{ font-family: var(--font-mono); font-size:0.78rem; color: var(--muted); }

/* FAQ */
.faq-section{ background: var(--panel); border-top:1px solid var(--line); }
.faq-grid{ display:grid; grid-template-columns: 0.7fr 1.3fr; gap:56px; }
.faq-head{ margin-bottom:0; }
.accordion-item{ border-bottom: 1px solid var(--line); }
.accordion-item:first-child{ border-top: 1px solid var(--line); }
.accordion-trigger{
  width:100%; display:flex; align-items:center; justify-content:space-between;
  background:none; border:none; text-align:left; cursor:pointer;
  padding: 20px 0; font-family: var(--font-display); font-size:1.05rem; font-weight:500; color: var(--ink);
}
.accordion-icon{ font-family: var(--font-mono); font-size:1.2rem; color: var(--signal); transition: transform 0.2s ease; }
.accordion-trigger[aria-expanded="true"] .accordion-icon{ transform: rotate(45deg); }
.accordion-panel{ max-height:0; overflow:hidden; transition: max-height 0.3s ease; }
.accordion-panel p{ padding-bottom:20px; margin:0; font-size:0.94rem; }

/* Newsletter */
.newsletter-inner{
  background: var(--signal); color:#fff; padding: 52px 46px;
  display:grid; grid-template-columns: 1.2fr 1fr; gap:26px; align-items:center;
}
.newsletter-inner h2{ color:#fff; font-size: clamp(1.5rem, 2.4vw, 2rem); }
.newsletter-inner p{ color: rgba(255,255,255,0.82); margin:0; }
.newsletter-form{ display:flex; gap:10px; }
.newsletter-form input{ flex-grow:1; padding:13px 16px; border:none; border-radius:2px; font-family: var(--font-body); font-size:0.94rem; }
.newsletter-form .btn-solid{ background: var(--ink); }

/* ---------- Footer ---------- */
.site-footer{ background: var(--ink); color: rgba(242,244,241,0.85); padding: 66px 0 28px; }
.footer-grid{ display:grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap:40px; padding-bottom:46px; border-bottom:1px solid rgba(242,244,241,0.14); }
.footer-brand .logo{ color:#fff; }
.footer-brand p{ font-size:0.88rem; color: rgba(242,244,241,0.55); margin-top:14px; }
.footer-col h4{ font-family: var(--font-mono); font-weight:400; font-size:0.78rem; color: rgba(242,244,241,0.5); margin-bottom:14px; }
.footer-col{ display:flex; flex-direction:column; gap:10px; }
.footer-col a{ text-decoration:none; font-size:0.9rem; color: rgba(242,244,241,0.82); }
.footer-col a:hover{ color: var(--amber); }
.footer-legal{ padding-top:24px; font-size:0.76rem; color: rgba(242,244,241,0.4); display:flex; flex-direction:column; gap:10px; }
.footer-legal p{ max-width:none; margin:0; color: inherit; }

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .hero-grid,.assay-grid,.calc-grid,.lab-grid,.faq-grid{ grid-template-columns:1fr; }
  .hero-diagram{ order:-1; max-width:300px; margin:0 auto 24px; }
  .product-row{ grid-template-columns: repeat(2,1fr); }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
  .newsletter-inner{ grid-template-columns:1fr; }
  .review-row{ grid-template-columns: 1fr; }
}
@media (max-width: 720px){
  .wrap{ padding:0 20px; }
  .main-nav{
    position:absolute; top:80px; left:0; right:0; background: var(--paper);
    flex-direction:column; gap:0; border-bottom:1px solid var(--line);
    max-height:0; overflow:hidden; transition: max-height 0.25s ease;
  }
  .main-nav.open{ max-height:320px; }
  .main-nav a{ padding:16px 20px; border-bottom:1px solid var(--line); }
  .nav-toggle{ display:flex; }
  .header-actions .btn-small{ display:none; }
  .product-row{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr; }
  .section{ padding:64px 0; }
}