/* ==========================================================================
   THE BUYER'S MATH - UNIFIED DESIGN SYSTEM (styles.css - v3 Rich Components)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-400: #94a3b8;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50:  #f8fafc;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;

  --emerald-600: #059669;
  --emerald-500: #10b981;
  --emerald-50:  #ecfdf5;

  --amber-600: #d97706;
  --amber-500: #f59e0b;
  --amber-50:  #fffbeb;

  --purple-600: #7c3aed;
  --purple-50:  #f5f3ff;

  --bg-page: var(--slate-50);
  --bg-card: #ffffff;
  --text-main: var(--slate-900);
  --text-muted: var(--slate-600);
  --border: var(--slate-200);

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
  --radius-md: 10px;
  --radius-lg: 16px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.65;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  color: var(--slate-900);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

a { color: var(--primary); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--primary-hover); }

/* Header & Nav */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.site-logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--slate-900);
  letter-spacing: -0.03em;
}
.site-nav { display: flex; gap: 1.5rem; align-items: center; }
.site-nav a { color: var(--slate-600); font-size: 0.95rem; font-weight: 600; }
.site-nav a:hover { color: var(--primary); }

/* Breadcrumbs */
.breadcrumbs {
  max-width: 1140px;
  margin: 1.25rem auto 0 auto;
  padding: 0 1.5rem;
  font-size: 0.875rem;
  color: var(--slate-500);
}
.breadcrumbs a { color: var(--slate-600); }
.breadcrumbs span.current { color: var(--slate-900); font-weight: 600; }

/* Hero & Badges */
.hero-section {
  text-align: center;
  padding: 3rem 1.5rem 2rem 1.5rem;
  max-width: 860px;
  margin: 0 auto;
}
.hero-section h1 {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.035em;
}
.hero-section p.subtitle {
  font-size: 1.2rem;
  color: var(--slate-600);
  margin-bottom: 1.5rem;
}
.trust-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--emerald-50);
  color: var(--emerald-600);
  border: 1px solid rgba(16, 185, 129, 0.25);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}

/* Live Search Bar */
.search-container {
  max-width: 580px;
  margin: 0 auto 1.75rem auto;
  position: relative;
}
.search-input {
  width: 100%;
  padding: 0.875rem 1.25rem 0.875rem 2.85rem;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 9999px;
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  color: var(--slate-900);
  transition: all 0.2s ease;
}
.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--slate-400);
  pointer-events: none;
}

/* Category Filter Bar */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  max-width: 1140px;
  margin: 0 auto 2rem auto;
  padding: 0 1.5rem;
}
.filter-btn {
  background: #ffffff;
  border: 1px solid var(--border);
  color: var(--slate-600);
  padding: 0.5rem 1.15rem;
  border-radius: 9999px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s ease;
}
.filter-btn:hover { background: var(--slate-50); color: var(--slate-900); }
.filter-btn.active {
  background: var(--slate-900);
  color: #ffffff;
  border-color: var(--slate-900);
}

/* Calculator Grid */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem 1.5rem;
}
.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  color: inherit;
}
.calc-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: #cbd5e1; }
.calc-card h3 { font-size: 1.25rem; margin: 0 0 0.5rem 0; }
.calc-card p { color: var(--slate-600); font-size: 0.95rem; margin: 0 0 1.5rem 0; flex-grow: 1; }
.calc-card .cta-link { font-weight: 600; font-size: 0.95rem; color: var(--primary); }
.badge-category {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: 0.5rem;
  display: inline-block;
}

/* Article Cards */
#article-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 3rem 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}
#article-list li {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
}
#article-list li:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
#article-list li .article-date {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 0.75rem;
  width: fit-content;
}
#article-list li a { font-size: 1.1rem; font-weight: 700; color: var(--slate-900); line-height: 1.45; }

/* Interactive Calculator Layout */
.container { max-width: 1140px; margin: 1.5rem auto 4rem auto; padding: 0 1.5rem; }
.calc-intro { text-align: center; margin-bottom: 2.5rem; }
.calc-intro h1 { font-size: 2.25rem; margin-bottom: 0.5rem; }
.calc-intro p { color: var(--slate-600); font-size: 1.1rem; }
.split-layout { display: grid; grid-template-columns: 3fr 2fr; gap: 2rem; align-items: start; }
@media (max-width: 820px) { .split-layout { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}
.receipt {
  background: var(--slate-900) !important;
  color: #f8fafc !important;
  border-radius: var(--radius-lg) !important;
  padding: 2rem !important;
  box-shadow: var(--shadow-lg) !important;
  position: sticky !important;
  top: 5.5rem !important;
}
.receipt h2 { color: #ffffff !important; font-size: 1.35rem; margin-top: 0; border-bottom: 1px solid var(--slate-700); padding-bottom: 0.75rem; }
.receipt-row { display: flex; justify-content: space-between; margin-bottom: 0.85rem; font-size: 0.95rem; color: var(--slate-400); }
.receipt-row strong, .receipt-row span:last-child { color: #f8fafc; font-weight: 600; }
.total-row {
  display: flex;
  justify-content: space-between;
  border-top: 2px solid var(--slate-700);
  padding-top: 1rem;
  margin-top: 1.25rem;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--amber-500) !important;
}
.receipt-disclaimer { font-size: 0.8rem; color: var(--slate-400); margin-top: 1.25rem; line-height: 1.45; }

/* Financing Box in Receipt */
.financing-pill {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--slate-700);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  margin-top: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}
.financing-pill span { color: var(--slate-300); }
.financing-pill strong { color: #38bdf8; font-size: 1rem; }

/* Form Controls */
.form-group { margin-bottom: 1.75rem; }
label { display: block; font-weight: 600; color: var(--slate-900); margin-bottom: 0.6rem; font-size: 0.95rem; }
.val-badge { font-size: 0.95rem; font-weight: 700; color: var(--primary) !important; background: var(--primary-light); padding: 0.2rem 0.6rem; border-radius: 6px; float: right; }
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--slate-200);
  outline: none;
  margin: 0.5rem 0;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid #ffffff;
  box-shadow: var(--shadow-md);
}
select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--slate-800);
  font-weight: 500;
  cursor: pointer;
}

/* Contractor Vetting Checklist Component */
.contractor-checklist-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 3rem;
  box-shadow: var(--shadow-sm);
}
.contractor-checklist-card h3 {
  margin-top: 0;
  font-size: 1.35rem;
  color: var(--slate-900);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.checklist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.25rem;
}
.checklist-item {
  background: var(--slate-50);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
}
.checklist-item strong {
  color: var(--slate-900);
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
}
.checklist-item p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--slate-600);
  line-height: 1.5;
}

/* Related Calculators Carousel */
.related-calculators-section {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 2px solid var(--slate-200);
}
.related-calculators-section h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--slate-900);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* Affiliate & SEO */
.curated-recommendation {
  background: var(--amber-50) !important;
  border: 1px solid rgba(245, 158, 11, 0.3) !important;
  border-radius: var(--radius-md) !important;
  padding: 1.25rem !important;
  margin: 2rem 0 !important;
  text-align: center;
}
.btn-affiliate {
  display: inline-block;
  background: var(--amber-600) !important;
  color: #ffffff !important;
  font-weight: 700;
  font-size: 0.925rem;
  padding: 0.7rem 1.4rem;
  border-radius: 8px;
  text-decoration: none;
}
.seo-guide-section {
  max-width: 1140px;
  margin: 3.5rem auto 0 auto;
  padding: 2.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
details {
  background: var(--slate-50);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 0.85rem;
}
summary { font-weight: 600; cursor: pointer; color: var(--slate-900); }

/* Footer */
.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border);
  padding: 3.5rem 1.5rem 2.5rem 1.5rem;
  margin-top: 5rem;
  text-align: center;
  color: var(--slate-500);
  font-size: 0.875rem;
}
.footer-nav a { color: var(--slate-600); font-weight: 500; margin: 0 0.85rem; }
.footer-disclosure { max-width: 720px; margin: 0 auto 1rem auto; font-size: 0.8rem; color: var(--slate-400); }