/* ============================================
   WaterFilterGeek.com - Main Stylesheet
   Style: Consumer Reports / Data-Driven
   Colors: Navy (#1a2744), White (#fff), Charcoal (#333), Accent (#2563eb)
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy: #1a2744;
  --navy-light: #243358;
  --charcoal: #333333;
  --charcoal-light: #555555;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --green: #16a34a;
  --red: #dc2626;
  --bg: #f8f9fa;
  --white: #ffffff;
  --border: #dee2e6;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --max-width: 1140px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--charcoal);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; }

/* --- Layout --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* --- Header --- */
.site-header {
  background: var(--navy);
  color: var(--white);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.site-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.5px;
}
.site-logo:hover { text-decoration: none; color: var(--white); }
.site-logo span { color: var(--accent); }

/* Nav */
.main-nav { display: flex; gap: 8px; align-items: center; }
.main-nav a {
  color: rgba(255,255,255,0.85);
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
}
.main-nav a:hover, .main-nav a.active {
  background: rgba(255,255,255,0.12);
  color: var(--white);
  text-decoration: none;
}

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; color: white; font-size: 1.5rem; cursor: pointer; padding: 8px; }

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: var(--white);
  padding: 60px 20px;
  text-align: center;
}
.hero h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 16px; line-height: 1.2; }
.hero p { font-size: 1.15rem; opacity: 0.9; max-width: 640px; margin: 0 auto; }

/* --- Article Content --- */
.article-content {
  background: var(--white);
  max-width: 800px;
  margin: 40px auto;
  padding: 48px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.article-content h1 {
  font-size: 2rem;
  color: var(--navy);
  margin-bottom: 16px;
  line-height: 1.25;
}
.article-content h2 {
  font-size: 1.5rem;
  color: var(--navy);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}
.article-content h3 {
  font-size: 1.2rem;
  color: var(--charcoal);
  margin: 28px 0 12px;
}
.article-content p { margin-bottom: 16px; }
.article-content ul, .article-content ol {
  margin: 0 0 16px 24px;
}
.article-content li { margin-bottom: 8px; }

/* Breadcrumb */
.breadcrumb {
  max-width: 800px;
  margin: 20px auto 0;
  padding: 0 20px;
  font-size: 0.85rem;
  color: var(--charcoal-light);
}
.breadcrumb a { color: var(--accent); }

/* Author/Date bar */
.article-meta {
  font-size: 0.85rem;
  color: var(--charcoal-light);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

/* --- Comparison Table --- */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}
.comparison-table th {
  background: var(--navy);
  color: var(--white);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
}
.comparison-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.comparison-table tr:nth-child(even) td { background: #f1f5f9; }
.comparison-table .badge {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
}
.comparison-table .badge-green { background: var(--green); }

/* --- Pros/Cons Boxes --- */
.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0;
}
.pros-box, .cons-box {
  padding: 20px 24px;
  border-radius: 8px;
  border: 2px solid;
}
.pros-box { border-color: var(--green); background: #f0fdf4; }
.cons-box { border-color: var(--red); background: #fef2f2; }
.pros-box h4, .cons-box h4 { margin-bottom: 12px; font-size: 1rem; }
.pros-box h4 { color: var(--green); }
.cons-box h4 { color: var(--red); }
.pros-box ul, .cons-box ul { list-style: none; margin: 0; padding: 0; }
.pros-box li::before { content: "✓ "; color: var(--green); font-weight: 700; }
.cons-box li::before { content: "✗ "; color: var(--red); font-weight: 700; }
.pros-box li, .cons-box li { margin-bottom: 6px; font-size: 0.95rem; }

/* --- Product Card --- */
.product-card {
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  margin: 24px 0;
  background: var(--white);
}
.product-card.top-pick { border-color: var(--accent); }
.product-card h3 { margin-top: 0; color: var(--navy); }
.product-card .price { font-size: 1.3rem; font-weight: 700; color: var(--navy); }
.product-card .cta-btn {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  margin-top: 12px;
  transition: background 0.2s;
}
.product-card .cta-btn:hover { background: var(--accent-dark); text-decoration: none; }
.product-card .label {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.product-card .label-green { background: var(--green); }

/* --- Info Box / Callout --- */
.info-box {
  background: #eff6ff;
  border-left: 4px solid var(--accent);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 8px 8px 0;
  font-size: 0.95rem;
}
.info-box strong { color: var(--navy); }

/* --- Calculator --- */
.calculator-box {
  background: var(--white);
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 28px;
  margin: 24px 0;
}
.calculator-box label { display: block; font-weight: 600; margin: 12px 0 6px; color: var(--navy); }
.calculator-box input, .calculator-box select {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 4px;
}
.calculator-box button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 16px;
}
.calculator-box button:hover { background: var(--accent-dark); }
#calc-result {
  margin-top: 16px;
  padding: 16px;
  background: #f0fdf4;
  border-radius: 8px;
  font-weight: 600;
  display: none;
}

/* --- Rating Stars --- */
.rating { color: #f59e0b; font-size: 1.2rem; margin: 8px 0; }

/* --- Homepage Cards Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin: 40px auto;
  max-width: var(--max-width);
  padding: 0 20px;
}
.card {
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,0,0,0.12); }
.card-img { width: 100%; height: 200px; object-fit: cover; }
.card-body { padding: 20px; }
.card-body h3 { color: var(--navy); margin-bottom: 8px; font-size: 1.1rem; }
.card-body p { font-size: 0.9rem; color: var(--charcoal-light); margin-bottom: 12px; }
.card-body .read-more { font-weight: 600; font-size: 0.9rem; }

/* --- Footer --- */
.site-footer {
  background: var(--navy);
  color: rgba(255,255,255,0.7);
  padding: 40px 20px;
  margin-top: 60px;
  text-align: center;
  font-size: 0.9rem;
}
.site-footer a { color: rgba(255,255,255,0.85); }
.footer-links { margin-bottom: 12px; }
.footer-links a { margin: 0 12px; }
.affiliate-disclosure {
  max-width: 640px;
  margin: 16px auto 0;
  font-size: 0.8rem;
  opacity: 0.7;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  .article-content { padding: 24px 18px; margin: 20px 12px; }
  .pros-cons { grid-template-columns: 1fr; }
  .comparison-table { font-size: 0.8rem; }
  .comparison-table th, .comparison-table td { padding: 8px 10px; }
  .header-inner { height: 56px; }
  .main-nav { 
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--navy);
    flex-direction: column;
    padding: 12px 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 20px; }
  .nav-toggle { display: block; }
  .card-grid { grid-template-columns: 1fr; padding: 0 12px; }
}

/* --- Table overflow on mobile --- */
.table-wrap { overflow-x: auto; margin: 24px 0; }

/* --- Affiliate disclosure inline --- */
.disclosure-inline {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  margin: 20px 0;
  color: var(--charcoal-light);
}

/* --- TOC --- */
.toc {
  background: #f1f5f9;
  border-radius: 8px;
  padding: 20px 24px;
  margin: 24px 0;
}
.toc h4 { margin-bottom: 10px; color: var(--navy); }
.toc ol { margin: 0 0 0 20px; }
.toc li { margin-bottom: 4px; font-size: 0.95rem; }