/* ============================================
   SEER CALCULATOR - STYLESHEET
   HVAC/Energy - Blue Theme
   ============================================ */

:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #60a5fa;
  --primary-bg: #eff6ff;
  --secondary: #1d4ed8;
  --accent: #06b6d4;
  --success: #10b981;
  --success-bg: #d1fae5;
  --warning: #f59e0b;
  --warning-bg: #fef3c7;
  --error: #ef4444;
  --error-bg: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
}

/* Skip Navigation */
.skip-link { position: absolute; top: -100%; left: 50%; transform: translateX(-50%); background: var(--primary-dark); color: #fff; padding: 0.5rem 1.5rem; border-radius: 0 0 var(--radius-md) var(--radius-md); font-weight: 600; z-index: 200; text-decoration: none; font-size: 0.875rem; }
.skip-link:focus { top: 0; color: #fff; text-decoration: none; }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); font-size: 16px; line-height: 1.6; color: var(--gray-800); background: var(--gray-50); min-height: 100vh; display: flex; flex-direction: column; }

h1, h2, h3, h4 { font-weight: 600; line-height: 1.3; color: var(--gray-900); }
h1 { font-size: 2.25rem; margin-bottom: 1rem; }
h2 { font-size: 1.5rem; margin-top: 2rem; margin-bottom: 1rem; }
h3 { font-size: 1.25rem; margin-top: 1.5rem; margin-bottom: 0.5rem; }
p { margin-bottom: 1rem; }
a { color: var(--primary-dark); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: var(--primary); text-decoration: underline; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1rem; }
.content-narrow { max-width: 800px; margin: 0 auto; }
main { flex: 1; padding: 2rem 0 3rem; }

/* Header */
.header { background: white; border-bottom: 1px solid var(--gray-200); position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 0.5rem; font-weight: 700; font-size: 1.125rem; color: var(--gray-900); text-decoration: none; }
.logo:hover { text-decoration: none; color: var(--primary-dark); }
.logo-icon { width: 32px; height: 32px; color: var(--primary); }
.nav-desktop { display: flex; align-items: center; gap: 1.5rem; }
.nav-desktop a { font-size: 0.9375rem; font-weight: 500; color: var(--gray-600); padding: 0.5rem 0; border-bottom: 2px solid transparent; transition: all 0.15s ease; }
.nav-desktop a:hover, .nav-desktop a.active { color: var(--primary-dark); text-decoration: none; border-bottom-color: var(--primary); }
.nav-toggle { display: none; background: none; border: none; padding: 0.5rem; cursor: pointer; color: var(--gray-700); }
.nav-toggle svg { width: 24px; height: 24px; }
.nav-mobile { display: none; position: absolute; top: 100%; left: 0; right: 0; background: white; border-bottom: 1px solid var(--gray-200); padding: 1rem; box-shadow: var(--shadow-lg); }
.nav-mobile.active { display: block; }
.nav-mobile a { display: block; padding: 0.5rem 1rem; color: var(--gray-700); font-weight: 500; border-radius: var(--radius-md); }
.nav-mobile a:hover { background: var(--gray-100); text-decoration: none; }
@media (max-width: 768px) { .nav-desktop { display: none; } .nav-toggle { display: block; } }

.intro-text { font-size: 1.125rem; color: var(--gray-600); margin-bottom: 1.5rem; max-width: 700px; }

/* Calculator Card */
.calculator-card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: 0;
  margin-bottom: 1.5rem;
  overflow: hidden;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Tabs */
.calc-tabs { display: flex; background: var(--gray-100); border-bottom: 1px solid var(--gray-200); }
.calc-tab { flex: 1; min-width: 0; padding: 0.75rem 0.25rem; font-size: 0.75rem; font-weight: 500; color: var(--gray-600); background: transparent; border: none; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 0.25rem; transition: all 0.15s ease; border-bottom: 3px solid transparent; }
.calc-tab:hover { color: var(--gray-800); background: var(--gray-50); }
.calc-tab.active { color: var(--primary-dark); background: white; border-bottom-color: var(--primary); }
.calc-tab svg { width: 18px; height: 18px; }
.calc-tab-label { white-space: nowrap; font-size: 0.6875rem; }
@media (min-width: 400px) {
  .calc-tab { padding: 0.875rem 0.5rem; font-size: 0.8125rem; }
  .calc-tab-label { font-size: 0.75rem; }
  .calc-tab svg { width: 20px; height: 20px; }
}

.calc-panel { display: none; padding: 1.25rem; }
.calc-panel.active { display: block; }

/* Form */
.form-grid { display: grid; gap: 1rem; }
.form-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
@media (max-width: 480px) { .form-row { grid-template-columns: 1fr; } }
.form-group { display: flex; flex-direction: column; gap: 0.25rem; }
.form-label { font-size: 0.8125rem; font-weight: 500; color: var(--gray-700); }
.form-hint { font-size: 0.6875rem; color: var(--gray-500); }

.form-input {
  width: 100%;
  height: 44px;
  padding: 0 0.875rem;
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: white;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
  cursor: text;
}
.form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-bg); }
.form-input[type="date"],
.form-input[type="time"],
.form-input[type="datetime-local"] {
  cursor: pointer;
}
.form-input[type="date"]::-webkit-calendar-picker-indicator,
.form-input[type="time"]::-webkit-calendar-picker-indicator,
.form-input[type="datetime-local"]::-webkit-calendar-picker-indicator {
  cursor: pointer;
  padding: 0;
  margin: 0;
  position: absolute;
  right: 0;
  left: 0;
  top: 0;
  bottom: 0;
  width: auto;
  height: auto;
  background: transparent;
  color: transparent;
}
.form-select {
  height: 44px;
  padding: 0 0.875rem;
  font-size: 0.9375rem;
  color: var(--gray-800);
  background: white;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  cursor: pointer;
  width: 100%;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
}
.form-select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-bg); }

/* Number input spinner buttons - make touch-friendly */
.form-input[type="number"]::-webkit-inner-spin-button,
.form-input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.form-input[type="number"] {
  -moz-appearance: textfield;
}


/* Mobile adjustments for calculator */
@media (max-width: 600px) {
  .calculator-card {
    margin-left: -1rem;
    margin-right: -1rem;
    border-radius: 0;
    max-width: none;
  }
  .calc-panel { padding: 1rem; }
  .result-value { font-size: 2rem; }
}

/* Radio */
.radio-group { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.radio-option { display: flex; align-items: center; gap: 0.375rem; cursor: pointer; padding: 0.5rem 0.75rem; border: 1px solid var(--gray-300); border-radius: var(--radius-md); transition: all 0.15s ease; font-size: 0.8125rem; }
.radio-option:hover { border-color: var(--primary-light); background: var(--primary-bg); }
.radio-option:has(input:checked) { border-color: var(--primary); background: var(--primary-bg); }
.radio-option input[type="radio"]:checked + span { color: var(--primary-dark); font-weight: 600; }
.radio-option input[type="radio"] { width: 14px; height: 14px; accent-color: var(--primary); cursor: pointer; margin: 0; }

/* Calculate Button */
.calculate-btn {
  width: 100%;
  height: 48px;
  margin-top: 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.15s ease;
  box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.35);
}
.calculate-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px 0 rgba(59, 130, 246, 0.45); }
.calculate-btn:active { transform: translateY(0); }
.calculate-btn svg { width: 20px; height: 20px; }

/* Results */
.results-section { display: none; margin-top: 1.25rem; padding-top: 1.25rem; border-top: 1px solid var(--gray-200); }
.results-section.visible { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.result-primary { text-align: center; padding: 1.25rem; margin-bottom: 0.75rem; background: linear-gradient(135deg, var(--primary-bg) 0%, #dbeafe 100%); border-radius: var(--radius-lg); border: 1px solid var(--primary-light); }
.result-label { font-size: 0.75rem; font-weight: 500; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.25rem; }
.result-value { font-size: 2.5rem; font-weight: 700; color: var(--primary-dark); line-height: 1.2; }
.result-unit { font-size: 1.125rem; font-weight: 500; color: var(--gray-500); }
.result-sublabel { font-size: 0.875rem; color: var(--gray-600); margin-top: 0.25rem; }

/* Savings highlight */
.savings-highlight { background: var(--success-bg); border: 1px solid var(--success); }
.savings-highlight .result-value { color: #059669; }

/* Results Grid */
.results-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.5rem; margin-top: 0.75rem; }
.results-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 480px) { .results-grid, .results-grid-4 { grid-template-columns: repeat(2, 1fr); } }
.result-item { padding: 0.75rem; background: var(--gray-50); border-radius: var(--radius-md); text-align: center; border: 1px solid var(--gray-200); }
.result-item-label { font-size: 0.6875rem; color: var(--gray-500); margin-bottom: 0.125rem; text-transform: uppercase; }
.result-item-value { font-size: 1.0625rem; font-weight: 600; color: var(--gray-800); }

/* Comparison bars */
.comparison-bars { margin: 1rem 0 0.5rem; }
.comparison-bar { margin-bottom: 0.75rem; }
.comparison-bar-header { display: flex; justify-content: space-between; margin-bottom: 0.25rem; font-size: 0.8125rem; }
.comparison-bar-label { font-weight: 500; color: var(--gray-700); }
.comparison-bar-value { font-weight: 600; color: var(--gray-800); }
.comparison-bar-track { height: 20px; background: var(--gray-200); border-radius: var(--radius-full); overflow: hidden; }
.comparison-bar-fill { height: 100%; border-radius: var(--radius-full); transition: width 0.5s ease; }
.comparison-bar-fill.old { background: var(--gray-400); }
.comparison-bar-fill.new { background: var(--success); }

/* Enhanced Results Report */
.results-report {
  max-width: 800px;
  margin: 1.5rem auto 0;
  background: white;
  border-radius: var(--radius-xl);
  border: 1px solid var(--gray-200);
  overflow: hidden;
}
.results-report-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}
.results-report-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-800);
  margin: 0;
}
.print-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--gray-600);
  background: white;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.15s ease;
}
.print-btn:hover { background: var(--gray-100); color: var(--gray-800); }
.print-btn svg { width: 16px; height: 16px; }
.results-report-body { padding: 1.25rem; }

/* Section Headers in Report */
.report-section { margin-bottom: 1.5rem; }
.report-section:last-child { margin-bottom: 0; }
.report-section-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--gray-700);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-200);
}

/* Summary Table */
.summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.summary-table th,
.summary-table td {
  padding: 0.625rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-100);
}
.summary-table th {
  font-weight: 500;
  color: var(--gray-500);
  font-size: 0.75rem;
  text-transform: uppercase;
  background: var(--gray-50);
}
.summary-table td { color: var(--gray-700); }
.summary-table td:first-child { font-weight: 500; color: var(--gray-800); }
.summary-table td:last-child { text-align: right; }
.summary-table .highlight-row { background: var(--success-bg); }
.summary-table .highlight-row td { color: #059669; font-weight: 600; }
.summary-table .value-good { color: #059669; }
.summary-table .value-warning { color: #d97706; }
.summary-table .value-bad { color: #dc2626; }

/* Visual Progress/Chart */
.visual-chart {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 1rem;
  margin-bottom: 1rem;
}
.visual-chart-title {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-500);
  margin-bottom: 0.5rem;
}
.savings-scale {
  position: relative;
  height: 40px;
  background: linear-gradient(90deg, #fee2e2 0%, #fef3c7 33%, #d1fae5 66%, #a7f3d0 100%);
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
}
.savings-scale-marker {
  position: absolute;
  top: -8px;
  transform: translateX(-50%);
  width: 3px;
  height: 56px;
  background: var(--gray-800);
  border-radius: 2px;
}
.savings-scale-marker::after {
  content: attr(data-value);
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-800);
  white-space: nowrap;
}
.savings-scale-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.6875rem;
  color: var(--gray-500);
  margin-top: 1.5rem;
}

/* Tips Grid */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}
@media (max-width: 600px) { .tips-grid { grid-template-columns: 1fr; } }
.tip-card {
  display: flex;
  gap: 0.75rem;
  padding: 0.875rem;
  background: var(--gray-50);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
}
.tip-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-bg);
  border-radius: var(--radius-md);
  color: var(--primary);
}
.tip-icon svg { width: 18px; height: 18px; }
.tip-content { flex: 1; min-width: 0; }
.tip-content strong { display: block; font-size: 0.8125rem; font-weight: 600; color: var(--gray-800); margin-bottom: 0.125rem; }
.tip-content p { font-size: 0.75rem; color: var(--gray-600); line-height: 1.4; margin: 0; }
.tip-title { font-size: 0.8125rem; font-weight: 600; color: var(--gray-800); margin-bottom: 0.125rem; }
.tip-desc { font-size: 0.75rem; color: var(--gray-600); line-height: 1.4; }

/* What This Means Section */
.interpretation-box {
  background: var(--primary-bg);
  border: 1px solid var(--primary-light);
  border-radius: var(--radius-lg);
  padding: 1rem;
}
.interpretation-box p {
  font-size: 0.875rem;
  color: var(--gray-700);
  margin: 0 0 0.5rem;
  line-height: 1.5;
}
.interpretation-box p:last-child { margin-bottom: 0; }
.interpretation-box strong { color: var(--primary-dark); }

/* Conversion Display */
.conversion-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
}
.conv-value-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 1.5rem;
  background: white;
  border-radius: var(--radius-lg);
  border: 2px solid var(--gray-200);
  min-width: 100px;
}
.conv-value-box.conv-value-result {
  border-color: var(--success);
  background: var(--success-bg);
}
.conv-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-500);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}
.conv-value-result .conv-label { color: #059669; }
.conv-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--gray-800);
}
.conv-value-result .conv-number { color: #059669; }
.conv-arrow {
  color: var(--gray-400);
}
.conv-arrow svg {
  width: 28px;
  height: 28px;
}
@media (max-width: 400px) {
  .conversion-display { flex-direction: column; gap: 0.75rem; }
  .conv-arrow svg { transform: rotate(90deg); }
}

/* Report Section h4 */
.report-section h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
  margin: 0 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-200);
}

/* Value highlights in tables */
.value-highlight { font-weight: 700; color: var(--primary-dark); font-size: 1.125rem; }

/* Input Summary */
.input-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.5rem;
  background: var(--gray-50);
  border-radius: var(--radius-md);
  padding: 0.75rem;
}
.input-item {
  padding: 0.5rem;
}
.input-item-label,
.input-label {
  display: block;
  font-size: 0.6875rem;
  color: var(--gray-500);
  text-transform: uppercase;
  margin-bottom: 0.125rem;
}
.input-item-value,
.input-value {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-800);
}

/* Formula Display */
.formula-box {
  background: var(--gray-900);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--primary-light);
  text-align: center;
}
.formula-box strong { color: #fff; font-weight: 600; }
.formula-text {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--primary-light);
  margin: 0;
}
.formula-explanation {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-top: 0.375rem;
}

/* Print Styles */
@media print {
  .header, .footer, .nav-toggle, .nav-mobile, .calculate-btn, .print-btn { display: none !important; }
  .calculator-card { box-shadow: none; border: 1px solid #ddd; }
  .results-report { box-shadow: none; border: 1px solid #ddd; page-break-inside: avoid; }
  .tip-card { break-inside: avoid; }
  body { background: white; }
}

/* Content Section */
.content-section {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}
.content-section h2 { margin-top: 0; }
.content-section h2::after { content: ''; display: block; width: 60px; height: 3px; background: var(--primary); margin-top: 0.5rem; border-radius: var(--radius-full); }

/* Tables */
.table-responsive { overflow-x: auto; margin: 1.5rem 0; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.data-table th, .data-table td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--gray-200); }
.data-table th { font-weight: 600; color: var(--gray-700); background: var(--gray-50); }
.data-table td { color: var(--gray-600); }
.data-table tbody tr:hover { background: var(--primary-bg); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 0.75rem; max-width: 800px; margin-left: auto; margin-right: auto; }
.faq-item { border: 1px solid var(--gray-200); border-radius: var(--radius-lg); overflow: hidden; }
.faq-question { width: 100%; padding: 1rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; font-size: 0.9375rem; font-weight: 500; text-align: left; color: var(--gray-800); background: var(--gray-50); border: none; cursor: pointer; }
.faq-question:hover { background: var(--gray-100); }
.faq-question svg { width: 18px; height: 18px; color: var(--gray-400); transition: transform 0.15s ease; flex-shrink: 0; }
.faq-item.open .faq-question svg { transform: rotate(180deg); }
.faq-answer { display: none; padding: 1rem; background: white; }
.faq-item.open .faq-answer { display: block; }
.faq-answer p:last-child { margin-bottom: 0; }

/* Blog */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; margin-top: 2rem; }
.blog-card { background: white; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); overflow: hidden; transition: all 0.15s ease; }
.blog-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.blog-card-content { padding: 1.25rem; }
.blog-card-meta { font-size: 0.75rem; color: var(--gray-500); margin-bottom: 0.5rem; }
.blog-card h3 { margin: 0 0 0.5rem; font-size: 1.0625rem; }
.blog-card h3 a { color: var(--gray-900); }
.blog-card h3 a:hover { color: var(--primary-dark); text-decoration: none; }
.blog-card p { font-size: 0.875rem; color: var(--gray-600); margin-bottom: 0; }

/* Footer */
.footer { background: var(--gray-900); color: var(--gray-400); padding: 2.5rem 0 1.5rem; margin-top: auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand .logo { color: white; margin-bottom: 1rem; }
.footer-brand .logo-icon { color: var(--primary-light); }
.footer-brand p { font-size: 0.875rem; line-height: 1.6; }
.footer-nav h4 { color: white; font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 1rem; }
.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 0.5rem; }
.footer-nav a { font-size: 0.875rem; color: var(--gray-400); }
.footer-nav a:hover { color: white; text-decoration: none; }
.footer-bottom { padding-top: 1.5rem; border-top: 1px solid var(--gray-800); font-size: 0.8125rem; }

/* Breadcrumb */
.breadcrumb { display: flex; align-items: center; gap: 0.5rem; font-size: 0.8125rem; color: var(--gray-500); margin-bottom: 1rem; flex-wrap: wrap; }
.breadcrumb a { color: var(--gray-500); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .breadcrumb-sep { color: var(--gray-400); }
.breadcrumb .breadcrumb-current { color: var(--gray-700); font-weight: 500; }

/* Related Articles Grid */
.related-articles { max-width: 800px; margin: 2rem auto 0; }
.related-articles h2 { margin-top: 0; }
.related-articles-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1rem; }
@media (max-width: 768px) { .related-articles-grid { grid-template-columns: 1fr; } }
.related-card { background: white; border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 1.25rem; transition: all 0.15s ease; }
.related-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.related-card-meta { font-size: 0.6875rem; color: var(--gray-500); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.375rem; }
.related-card h3 { font-size: 0.9375rem; margin: 0 0 0.375rem; }
.related-card h3 a { color: var(--gray-900); }
.related-card h3 a:hover { color: var(--primary-dark); text-decoration: none; }
.related-card p { font-size: 0.8125rem; color: var(--gray-600); margin: 0; line-height: 1.5; }

/* External Link Indicator */
a[target="_blank"]::after { content: " \2197"; font-size: 0.75em; vertical-align: super; color: var(--gray-400); }

/* Callout Box */
.callout-box { border-radius: var(--radius-lg); padding: 1.25rem; margin: 1.5rem 0; border-left: 4px solid var(--primary); background: var(--primary-bg); }
.callout-box p { font-size: 0.9375rem; color: var(--gray-700); margin: 0 0 0.5rem; }
.callout-box p:last-child { margin-bottom: 0; }
.callout-box strong { color: var(--gray-900); }
.callout-success { border-left-color: var(--success); background: var(--success-bg); }
.callout-warning { border-left-color: var(--warning); background: var(--warning-bg); }

/* CSS Bar Chart */
.bar-chart { margin: 1.5rem 0; }
.bar-chart-title { font-size: 0.875rem; font-weight: 600; color: var(--gray-700); margin-bottom: 0.75rem; }
.bar-chart-item { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.5rem; }
.bar-chart-label { flex-shrink: 0; width: 80px; font-size: 0.8125rem; font-weight: 500; color: var(--gray-700); text-align: right; }
.bar-chart-track { flex: 1; height: 24px; background: var(--gray-100); border-radius: var(--radius-full); overflow: hidden; }
.bar-chart-fill { height: 100%; border-radius: var(--radius-full); background: linear-gradient(90deg, var(--primary) 0%, var(--primary-dark) 100%); transition: width 0.5s ease; display: flex; align-items: center; justify-content: flex-end; padding-right: 0.5rem; min-width: 2rem; }
.bar-chart-fill span { font-size: 0.6875rem; font-weight: 600; color: white; white-space: nowrap; }
.bar-chart-fill.fill-success { background: linear-gradient(90deg, var(--success) 0%, #059669 100%); }
.bar-chart-fill.fill-warning { background: linear-gradient(90deg, var(--warning) 0%, #d97706 100%); }
.bar-chart-fill.fill-gray { background: linear-gradient(90deg, var(--gray-400) 0%, var(--gray-500) 100%); }

/* Pros/Cons Box */
.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.5rem 0; }
@media (max-width: 600px) { .pros-cons { grid-template-columns: 1fr; } }
.pros-list, .cons-list { padding: 1.25rem; border-radius: var(--radius-lg); }
.pros-list { background: var(--success-bg); border: 1px solid var(--success); }
.cons-list { background: var(--error-bg); border: 1px solid var(--error); }
.pros-list h4, .cons-list h4 { font-size: 0.875rem; font-weight: 600; margin: 0 0 0.75rem; }
.pros-list h4 { color: #059669; }
.cons-list h4 { color: #dc2626; }
.pros-list ul, .cons-list ul { list-style: none; margin: 0; padding: 0; }
.pros-list li, .cons-list li { font-size: 0.8125rem; padding: 0.25rem 0; padding-left: 1.25rem; position: relative; }
.pros-list li { color: #065f46; }
.cons-list li { color: #991b1b; }
.pros-list li::before { content: "+"; position: absolute; left: 0; font-weight: 700; color: #059669; }
.cons-list li::before { content: "\2212"; position: absolute; left: 0; font-weight: 700; color: #dc2626; }

/* Key Takeaway */
.key-takeaway { background: linear-gradient(135deg, var(--primary-bg) 0%, #dbeafe 100%); border: 1px solid var(--primary); border-radius: var(--radius-lg); padding: 1.5rem; margin: 1.5rem 0; }
.key-takeaway h3 { margin: 0 0 1rem 0; color: var(--primary); font-size: 1.1rem; }
.key-takeaway ul { margin: 0; padding-left: 1.25rem; display: grid; gap: 0.5rem; }
.key-takeaway-title { font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--primary-dark); margin-bottom: 0.5rem; }
.key-takeaway p { font-size: 0.9375rem; color: var(--gray-800); margin: 0; line-height: 1.6; }
.key-takeaway strong { color: var(--primary-dark); }

/* Formula Display (large dark boxes) */
.formula-display { background: var(--gray-900); padding: 1.5rem; border-radius: var(--radius-lg); margin: 1rem 0; }
.formula-display-text { font-family: var(--font-mono); font-size: 1.1rem; color: var(--primary-light); text-align: center; }
.formula-display-text.formula-display-mb { margin-bottom: 1rem; }
.formula-display p { margin: 0; color: var(--gray-400); font-size: 0.9rem; }
.formula-display ul { margin: 0.5rem 0 0 0; color: var(--gray-400); font-size: 0.9rem; }
.formula-display-sm { background: var(--gray-900); padding: 1.25rem; border-radius: var(--radius-lg); text-align: center; margin: 1.5rem 0; }
.formula-display-sm .formula-display-text { font-size: 1rem; }

/* Code Block (light background mono) */
.code-block { background: var(--gray-100); padding: 1rem; border-radius: var(--radius-md); font-family: var(--font-mono); font-size: 0.9rem; overflow-x: auto; }

/* Callout Variants */
.callout-purple { border-left-color: #7c3aed; background: #ede9fe; }
.callout-box .callout-text { margin: 0; font-size: 0.95rem; }

/* Result Item Variants */
.result-item-danger { background: #fee2e2; border-color: #fca5a5; }
.result-item-success { background: #d1fae5; border-color: #6ee7b7; }
.result-item-label-mt { margin-top: 0.25rem; }

/* Table Row Highlights */
.row-excellent { background: #d1fae5; }
.row-good { background: #fef3c7; }
.row-poor { background: #fee2e2; }

/* Utility */
.text-right { text-align: right; }
.text-center { text-align: center; }
.mt-sm { margin-top: 1rem; }
.mt-md { margin-top: 1.5rem; }
.footer-updated { text-align: center; color: var(--gray-500); font-size: 0.875rem; margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--gray-200); }
.view-all-link { margin-top: 1.5rem; text-align: center; }
.view-all-link a { color: var(--primary); font-weight: 600; }
.fieldset-reset { border: none; padding: 0; margin: 0; }

/* Blog Hub */
.blog-section-heading { margin: 2rem 0 1rem 0; font-size: 1.25rem; color: var(--gray-800); }
.resource-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1rem; margin-top: 1rem; }
.resource-card { padding: 1rem; border: 1px solid var(--gray-200); border-radius: var(--radius-md); }
.resource-card h4 { margin: 0 0 0.5rem 0; font-size: 0.95rem; }
.resource-card p { margin: 0; font-size: 0.875rem; color: var(--gray-600); }
.cta-section { background: var(--gray-900); border-radius: var(--radius-lg); padding: 2rem; margin: 2rem 0; text-align: center; }
.cta-section h2 { color: white; margin: 0 0 0.75rem 0; }
.cta-section p { color: var(--gray-400); margin: 0 0 1.25rem 0; }
.cta-btn { display: inline-block; background: var(--primary); color: white; padding: 0.75rem 2rem; border-radius: var(--radius-md); text-decoration: none; font-weight: 600; }
.cta-btn:hover { background: var(--primary-dark); color: white; text-decoration: none; }
.featured-guide { background: linear-gradient(135deg, var(--primary-bg) 0%, #dbeafe 100%); border: 1px solid var(--primary); border-radius: var(--radius-lg); padding: 2rem; margin: 2rem 0; }
.featured-guide-label { color: var(--primary); font-weight: 600; font-size: 0.875rem; margin: 0 0 0.5rem 0; text-transform: uppercase; letter-spacing: 0.05em; }
.featured-guide h2 { margin: 0 0 0.75rem 0; font-size: 1.5rem; }
.featured-guide h2 a { color: var(--gray-900); text-decoration: none; }
.featured-guide h2 a:hover { color: var(--primary-dark); }
.featured-guide p { margin: 0 0 1rem 0; color: var(--gray-600); font-size: 1.05rem; }
.featured-guide .featured-guide-link { color: var(--primary); font-weight: 600; text-decoration: none; }
.featured-guide .featured-guide-link:hover { text-decoration: underline; }