:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --text: #1f2933;
  --muted: #52606d;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --border: #e4e7eb;
  --radius: 12px;
  --maxw: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 16px; }
img { max-width: 100%; height: auto; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255,255,255,.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--primary); text-decoration: none; }
.nav a { margin-left: 14px; color: var(--text); text-decoration: none; font-size: .95rem; }
.nav a:hover { color: var(--primary); }

/* Hero */
.hero { background: linear-gradient(160deg, #0f766e 0%, #115e59 100%); color: #fff; padding: 64px 0; }
.hero h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 12px; max-width: 18ch; }
.hero__sub { font-size: 1.05rem; opacity: .92; margin: 0 0 24px; max-width: 52ch; }

/* Sections */
.section { padding: 48px 0; }
.section--alt { background: var(--bg-alt); }
.section h2 { font-size: 1.5rem; margin: 0 0 20px; }

/* CTA */
.cta {
  display: inline-block; padding: 12px 22px; border-radius: 999px;
  font-weight: 700; text-decoration: none; transition: transform .05s ease;
}
.cta--primary { background: #fff; color: var(--primary-dark); }
.hero .cta--primary { background: #fbbf24; color: #1f2933; }
.cta--primary:hover { transform: translateY(-1px); }
.cta-disabled { opacity: .55; pointer-events: none; }

/* Grid / cards */
.grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.card {
  display: block; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; background: #fff; text-decoration: none; color: inherit;
  transition: box-shadow .15s ease, transform .05s ease;
}
.card:hover { box-shadow: 0 6px 20px rgba(15,118,110,.12); transform: translateY(-2px); }
.card__title { margin: 0 0 8px; font-size: 1.15rem; color: var(--primary-dark); }
.card__summary { margin: 0 0 12px; color: var(--muted); }
.card__cta { color: var(--primary); font-weight: 700; font-size: .95rem; }

/* Benefits */
.benefits { padding-left: 20px; margin: 0; }
.benefits li { margin-bottom: 8px; }

/* FAQ */
.faq__item { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; }
.faq__q {
  width: 100%; text-align: left; background: #fff; border: 0; cursor: pointer;
  padding: 16px; font-size: 1rem; font-weight: 600; display: flex; justify-content: space-between; align-items: center;
}
.faq__icon { color: var(--primary); font-size: 1.3rem; }
.faq__a { padding: 0 16px 16px; color: var(--muted); }
.faq__a p { margin: 0; }
.empty { color: var(--muted); }

/* Product detail */
#product-detail .back { display: inline-block; margin-bottom: 16px; color: var(--primary); text-decoration: none; }
#product-detail h1 { font-size: 1.8rem; color: var(--primary-dark); margin: 0 0 8px; }
#product-detail .lead { font-size: 1.1rem; color: var(--muted); margin: 0 0 20px; }
#product-detail .prose { white-space: pre-wrap; }
#product-detail h2 { font-size: 1.25rem; margin: 24px 0 8px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 28px 0; background: var(--bg-alt); }
.footer__inner { display: flex; flex-direction: column; gap: 8px; }
.footer__brand { margin: 0; font-weight: 800; color: var(--primary); }
.footer__nav a { margin-right: 16px; color: var(--text); text-decoration: none; }
.footer__copy { margin: 0; color: var(--muted); font-size: .9rem; }
.contact-email { color: var(--muted); }

/* Responsive */
@media (min-width: 768px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 2.4rem; }
}
@media (min-width: 1024px) {
  .grid { grid-template-columns: repeat(3, 1fr); }
  .hero h1 { font-size: 2.8rem; }
}
@media (min-width: 1280px) {
  .footer__inner { flex-direction: row; align-items: center; justify-content: space-between; }
}