/* American Water Quality — Global Stylesheet */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #1f2937;
  background: #f9fafb;
}

a { color: #1d4ed8; text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Navigation ── */
.nav {
  background: #1d4ed8;
  color: #fff;
  padding: 0.75rem 1rem;
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}
.nav-logo {
  font-weight: 700;
  font-size: 1.05rem;
  color: #fff;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.9rem;
}
.nav-links a { color: #bfdbfe; }
.nav-links a:hover { color: #fff; text-decoration: none; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.4rem;
  cursor: pointer;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #1d4ed8 0%, #0d9488 100%);
  color: #fff;
  padding: 4rem 1.25rem 3.5rem;
}
.hero .badge {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  border-radius: 9999px;
  padding: 0.25rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  max-width: 820px;
}
.hero p {
  font-size: 1.125rem;
  opacity: 0.92;
  max-width: 680px;
}

/* ── Main content ── */
.content {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.updated {
  font-size: 0.85rem;
  color: #6b7280;
  margin-bottom: 1.5rem;
}

.content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #1e3a8a;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}
.content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #1f2937;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}
.content p { margin-bottom: 1rem; }
.content ul, .content ol {
  margin: 0.5rem 0 1rem 1.5rem;
}
.content li { margin-bottom: 0.4rem; }

/* ── Table of Contents ── */
.toc {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 0.75rem;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0 2rem;
}
.toc h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #1e3a8a;
  margin: 0 0 0.75rem;
}
.toc ol {
  margin: 0 0 0 1.25rem;
}
.toc li { margin-bottom: 0.25rem; font-size: 0.95rem; }
.toc a { color: #1d4ed8; }

/* ── Alert box ── */
.alert {
  background: #fefce8;
  border: 1px solid #fde68a;
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin: 1.25rem 0;
}
.alert-icon { font-size: 1.25rem; flex-shrink: 0; margin-top: 0.1rem; }
.alert p { margin: 0; }

/* ── Info box ── */
.info-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
}
.info-box p { margin: 0; }

/* ── Tables ── */
.table-wrap { overflow-x: auto; margin: 1.25rem 0; border-radius: 0.5rem; border: 1px solid #e5e7eb; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
thead { background: #1e3a8a; color: #fff; }
thead th { padding: 0.65rem 0.9rem; text-align: left; font-weight: 600; }
tbody tr:nth-child(even) { background: #f9fafb; }
tbody td { padding: 0.6rem 0.9rem; border-bottom: 1px solid #e5e7eb; }
td.check { color: #059669; font-weight: 700; }
td.cross { color: #dc2626; font-weight: 700; }

/* ── Product grid ── */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0 2rem;
}
.product-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 0.875rem;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.product-card h3 { font-size: 1.05rem; font-weight: 700; margin: 0.5rem 0 0.4rem; }
.product-card p { font-size: 0.9rem; color: #374151; margin-bottom: 0.75rem; }
.product-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 9999px;
  padding: 0.2rem 0.65rem;
}
.price { font-size: 1.1rem; font-weight: 700; color: #1f2937; }

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}
.btn:hover { text-decoration: none; opacity: 0.9; }
.btn-green { background: #059669; color: #fff; }
.btn-blue  { background: #1d4ed8; color: #fff; }
.btn-purple{ background: #7c3aed; color: #fff; }

/* ── FAQ ── */
.faq { margin: 1rem 0 2rem; }
.faq details {
  border: 1px solid #e5e7eb;
  border-radius: 0.625rem;
  margin-bottom: 0.625rem;
  background: #fff;
}
.faq summary {
  padding: 0.875rem 1.125rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-size: 1.25rem;
  color: #6b7280;
  flex-shrink: 0;
}
details[open] summary::after { content: "−"; }
.faq-answer { padding: 0.75rem 1.125rem 1rem; border-top: 1px solid #f3f4f6; }
.faq-answer p { margin: 0; font-size: 0.95rem; }

/* ── Related links ── */
.related {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 0.875rem;
  padding: 1.25rem 1.5rem;
  margin: 2rem 0 0;
}
.related h3 { font-size: 1rem; font-weight: 700; color: #1e3a8a; margin-bottom: 0.75rem; }
.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.related-links a {
  background: #dbeafe;
  color: #1e40af;
  padding: 0.35rem 0.8rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
}
.related-links a:hover { background: #bfdbfe; text-decoration: none; }

/* ── Footer ── */
.footer {
  background: #1f2937;
  color: #d1d5db;
  padding: 2rem 1.25rem;
  margin-top: 2rem;
  font-size: 0.875rem;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.footer-inner p { margin-bottom: 0.5rem; }
.footer-links {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-links a { color: #9ca3af; }
.footer-links a:hover { color: #fff; text-decoration: none; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    padding-top: 0.5rem;
  }
  .nav-links.active { display: flex; }
  .product-grid { grid-template-columns: 1fr; }
  .hero { padding: 2.5rem 1rem 2rem; }
}