:root {
  --brand: #22C55E;
  --brand-dark: #15803D;
  --brand-soft: #D1FAE5;
  --accent: #F472B6;
  --ink: #111827;
  --ink-dark: #0F2D2A; /* brand primary dark */
  --muted: #6B7280;
  --bg: #F8FAF9;
  --bg-alt: #D1FAE5;
  --surface: #FFFFFF;
  --border: #E5E7EB;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }

.nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 10;
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.25rem;
  margin-right: auto;
}
.brand-mark { height: 26px; width: auto; }
.brand-word {
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--ink-dark);
}
.nav-links { display: flex; gap: 20px; }
.nav-links a { color: var(--muted); font-weight: 500; }
.nav-links a:hover { color: var(--ink); }

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: transparent; color: var(--brand); border: 1.5px solid var(--brand); }
.btn-ghost:hover { background: var(--brand-soft); }
.btn-lg { padding: 14px 28px; font-size: 1.05rem; }

.hero {
  background: linear-gradient(180deg, var(--brand-soft), var(--bg));
  padding: 90px 20px 70px;
  text-align: center;
}
.hero-inner { max-width: 720px; margin: 0 auto; }
.hero h1 { font-size: 2.75rem; margin: 0 0 16px; }
.lede { font-size: 1.2rem; color: var(--muted); margin: 0 0 32px; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 20px; }
.age-notice { font-size: 0.9rem; color: var(--muted); }

.features { padding: 70px 20px; }
.features-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}
.feature h3 { margin-bottom: 8px; }
.feature p { color: var(--muted); margin: 0; }

.safety { background: var(--brand-soft); padding: 60px 20px; text-align: center; }
.safety-inner { max-width: 640px; margin: 0 auto; }
.safety h2 { margin-top: 0; }
.safety p { color: var(--muted); }

.faq { padding: 70px 20px; }
.faq-inner { max-width: 700px; margin: 0 auto; }
.faq h2 { margin-top: 0; }
.faq details {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}
.faq summary { font-weight: 600; cursor: pointer; }
.faq p { color: var(--muted); margin: 12px 0 0; }

.footer { border-top: 1px solid var(--border); padding: 24px 20px; }
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--muted);
  font-size: 0.9rem;
}
.footer-links { display: flex; gap: 16px; }
.footer-links a:hover { color: var(--ink); }

@media (max-width: 640px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 2.1rem; }
}