/* ============================================
   DRYWALL CALCULATOR - MAIN STYLESHEET
   Construction/Home Improvement - Amber Theme
   ============================================ */

:root {
  --primary: #f59e0b;
  --primary-dark: #d97706;
  --primary-light: #fbbf24;
  --primary-bg: #fffbeb;
  --secondary: #92400e;
  --accent: #ea580c;
  --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);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
}

*, *::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, h5, h6 { 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; }
strong { font-weight: 600; }
ul, ol { margin-bottom: 1rem; padding-left: 1.5rem; }
li { margin-bottom: 0.5rem; }

.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 */
.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;
}
@media (max-width: 832px) {
  .calculator-card {
    max-width: 100%;
    border-radius: var(--radius-lg);
  }
}

/* Calculator Tabs */
.calc-tabs {
  display: flex;
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-200);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.calc-tabs::-webkit-scrollbar { display: none; }
.calc-tab {
  flex: 1;
  min-width: 0;
  padding: 0.875rem 0.75rem;
  font-size: 0.8125rem;
  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);
  font-weight: 600;
}
.calc-tab svg { width: 20px; height: 20px; }
.calc-tab-label { white-space: nowrap; }
@media (max-width: 500px) {
  .calc-tab { padding: 0.75rem 0.5rem; font-size: 0.75rem; }
  .calc-tab svg { width: 18px; height: 18px; }
}
@media (max-width: 400px) {
  .calc-tab { padding: 0.625rem 0.375rem; }
  .calc-tab svg { width: 16px; height: 16px; }
  .calc-tab-label { font-size: 0.6875rem; }
}

/* Tab Panels */
.calc-panel { display: none; padding: 1.25rem; }
.calc-panel.active { display: block; }
@media (max-width: 400px) { .calc-panel { padding: 1rem; } }

/* Form */
.form-grid { display: grid; gap: 1rem; }
.form-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; }
.form-row-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
@media (max-width: 500px) { .form-row, .form-row-2 { 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-label-hint { font-weight: 400; color: var(--gray-500); font-size: 0.75rem; }

/* Inputs */
.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: pointer;
  -webkit-appearance: none;
  -moz-appearance: textfield;
}
.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
  cursor: text;
}
.form-input[type="number"] { cursor: text; }
.form-input[type="date"] { cursor: pointer; }
.form-select {
  width: 100%;
  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;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.875rem center;
  padding-right: 2.5rem;
}
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

/* Input with unit */
.input-with-unit { position: relative; }
.input-with-unit .form-input { padding-right: 2.75rem; }
.input-unit {
  position: absolute;
  right: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.8125rem;
  color: var(--gray-500);
  pointer-events: none;
}

/* Range Slider - Enhanced */
.range-wrapper { display: flex; flex-direction: column; gap: 0.5rem; }
.range-input-group { display: flex; align-items: center; gap: 0.75rem; }
.range-slider {
  flex: 1;
  height: 8px;
  background: linear-gradient(to right, var(--primary-light), var(--gray-200));
  border-radius: var(--radius-full);
  appearance: none;
  cursor: pointer;
  border: 1px solid var(--gray-300);
}
.range-slider::-webkit-slider-thumb {
  appearance: none;
  width: 22px;
  height: 22px;
  background: white;
  border: 3px solid var(--primary);
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  transition: all 0.15s ease;
}
.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 3px 10px rgba(0,0,0,0.2);
}
.range-slider::-webkit-slider-thumb:active { cursor: grabbing; }
.range-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  background: white;
  border: 3px solid var(--primary);
  border-radius: 50%;
  cursor: grab;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}
.range-slider::-moz-range-track {
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  border: 1px solid var(--gray-300);
}
.range-value {
  min-width: 48px;
  text-align: center;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--primary-dark);
  background: var(--primary-bg);
  padding: 0.375rem 0.5rem;
  border-radius: var(--radius-md);
}

/* Checkbox */
.checkbox-group { display: flex; flex-wrap: wrap; gap: 1rem; }
.checkbox-wrapper { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; }
.checkbox-wrapper input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}
.checkbox-label { font-size: 0.875rem; color: var(--gray-700); }

/* Radio */
.radio-group { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.radio-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
}
.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"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
  margin: 0;
}
.radio-option span { line-height: 1.2; }

/* 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(245, 158, 11, 0.35);
}
.calculate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px 0 rgba(245, 158, 11, 0.45);
}
.calculate-btn:active { transform: translateY(0); }
.calculate-btn svg { width: 20px; height: 20px; }

/* Results */
.results-section {
  display: none;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-200);
}
.results-section.visible { display: block; animation: fadeIn 0.2s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.results-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.75rem; }
.results-title { font-size: 0.9375rem; font-weight: 600; color: var(--gray-800); margin: 0; }
.results-actions { display: flex; gap: 0.375rem; }
.action-btn {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-600);
  background: var(--gray-100);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}
.action-btn:hover { background: var(--gray-200); color: var(--gray-800); }
.action-btn svg { width: 12px; height: 12px; }

/* Primary Result */
.result-primary {
  text-align: center;
  padding: 1.25rem 1rem;
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, var(--primary-bg) 0%, #fef3c7 100%);
  border-radius: var(--radius-md);
  border: 2px 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: 0.375rem;
}
.result-value { font-size: 2rem; font-weight: 700; color: var(--primary-dark); line-height: 1.2; }
.result-sublabel { font-size: 0.8125rem; color: var(--gray-600); margin-top: 0.25rem; }

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
@media (max-width: 500px) { .results-grid { grid-template-columns: 1fr; } }
.result-item {
  padding: 0.75rem;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  text-align: center;
}
.result-item-icon { font-size: 1rem; margin-bottom: 0.25rem; }
.result-item-label { font-size: 0.75rem; color: var(--gray-500); margin-bottom: 0.125rem; }
.result-item-value { font-size: 1rem; font-weight: 600; color: var(--gray-800); }

/* Materials List */
.materials-list {
  background: var(--gray-50);
  border-radius: var(--radius-md);
  padding: 0.875rem;
}
.materials-list h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
.materials-list ul { list-style: none; padding: 0; margin: 0; }
.materials-list li {
  padding: 0.375rem 0;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}
.materials-list li:last-child { border-bottom: none; }
.materials-list .material-name { color: var(--gray-700); }
.materials-list .material-qty { font-weight: 600; color: var(--gray-800); }

/* Cost Breakdown */
.cost-breakdown {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.cost-row {
  display: flex;
  justify-content: space-between;
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--gray-200);
  font-size: 0.875rem;
}
.cost-row:last-child { border-bottom: none; }
.cost-row.total { background: var(--primary-bg); font-weight: 600; font-size: 1rem; }
.cost-label { color: var(--gray-700); }
.cost-value { color: var(--gray-800); font-weight: 500; }
.cost-row.total .cost-value { color: var(--primary-dark); }

/* Content Section */
.content-section {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  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: 0.9375rem; }
.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(--gray-50); }
.data-table .highlight { background: var(--primary-bg); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 0.75rem; }
.faq-item { border: 1px solid var(--gray-200); border-radius: var(--radius-lg); overflow: hidden; }
.faq-question { width: 100%; padding: 1rem 1.25rem; 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; transition: all 0.15s ease; }
.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 1.25rem; background: white; }
.faq-item.open .faq-answer { display: block; }
.faq-answer p:last-child { margin-bottom: 0; }

/* CTA Box */
.cta-box { padding: 2rem; margin: 2rem 0; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); border-radius: var(--radius-xl); text-align: center; }
.cta-box h3 { color: white; margin-top: 0; margin-bottom: 0.5rem; }
.cta-box p { color: rgba(255, 255, 255, 0.9); margin-bottom: 1.5rem; }
.cta-btn { display: inline-flex; align-items: center; gap: 0.5rem; padding: 1rem 2rem; font-size: 1rem; font-weight: 600; color: var(--primary-dark); background: white; border-radius: var(--radius-lg); text-decoration: none; transition: all 0.15s ease; box-shadow: var(--shadow-md); }
.cta-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); text-decoration: none; }

/* Blog */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 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: 1.5rem; }
.blog-card-meta { font-size: 0.8125rem; color: var(--gray-500); margin-bottom: 0.5rem; }
.blog-card h3 { margin-top: 0; margin-bottom: 0.5rem; font-size: 1.125rem; }
.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: 0.9375rem; color: var(--gray-600); margin-bottom: 1rem; }
.blog-card-link { font-size: 0.875rem; font-weight: 500; color: var(--primary-dark); }

/* Article */
.breadcrumb { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1.5rem; font-size: 0.875rem; color: var(--gray-500); flex-wrap: wrap; }
.breadcrumb a { color: var(--gray-500); }
.breadcrumb a:hover { color: var(--primary-dark); }
.article-header { margin-bottom: 2rem; }
.article-header h1 { margin-bottom: 1rem; }
.article-meta { display: flex; align-items: center; gap: 1.5rem; font-size: 0.875rem; color: var(--gray-500); }

/* TOC */
.toc { padding: 1.5rem; margin: 1.5rem 0; background: var(--gray-50); border-radius: var(--radius-lg); }
.toc h2 { margin-top: 0; font-size: 1rem; }
.toc ol { margin: 0; padding-left: 1.5rem; }
.toc li { padding: 0.25rem 0; }
.toc a { color: var(--gray-600); font-size: 0.9375rem; }
.toc a:hover { color: var(--primary-dark); }

/* Footer */
.footer { background: var(--gray-900); color: var(--gray-400); padding: 3rem 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); }
.footer-brand p { font-size: 0.875rem; line-height: 1.7; }
.footer-nav h4 { color: white; font-size: 0.875rem; 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); transition: color 0.15s ease; }
.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; }
.footer-disclaimer { max-width: 600px; font-size: 0.75rem; color: var(--gray-500); line-height: 1.6; margin-top: 0.5rem; }

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }

/* Related Guides */
.related-guides-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; margin-top: 1rem; }
.related-guide { padding: 1rem 1.25rem; background: white; border: 1px solid var(--gray-200); border-radius: var(--radius-md); transition: all 0.15s ease; }
.related-guide:hover { border-color: var(--primary-light); box-shadow: var(--shadow-sm); }
.related-guide h4 { margin: 0 0 0.5rem 0; font-size: 1rem; }
.related-guide h4 a { color: var(--gray-900); }
.related-guide h4 a:hover { color: var(--primary-dark); text-decoration: none; }
.related-guide p { margin: 0; font-size: 0.875rem; color: var(--gray-600); }

/* ============================================
   ENHANCED RESULTS SECTION
   ============================================ */

/* Material Breakdown Bar */
.material-breakdown {
  margin: 1rem 0;
  padding: 1rem;
  background: var(--gray-50);
  border-radius: var(--radius-md);
}
.material-breakdown h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--gray-700);
  margin: 0 0 0.75rem 0;
}
.breakdown-bar {
  height: 32px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  display: flex;
  margin-bottom: 0.5rem;
}
.breakdown-segment {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  font-weight: 600;
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
  min-width: 40px;
  transition: all 0.3s ease;
}
.breakdown-segment.walls { background: var(--primary); }
.breakdown-segment.ceiling { background: var(--primary-dark); }
.breakdown-segment.waste { background: var(--gray-400); }
.breakdown-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.75rem;
  color: var(--gray-600);
}
.breakdown-legend span {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.legend-dot.walls { background: var(--primary); }
.legend-dot.ceiling { background: var(--primary-dark); }
.legend-dot.waste { background: var(--gray-400); }

/* Cost panel specific colors */
#panel-cost .breakdown-segment.walls { background: var(--success); }
#panel-cost .breakdown-segment.ceiling { background: var(--secondary); }
#panel-cost .legend-dot.walls { background: var(--success); }
#panel-cost .legend-dot.ceiling { background: var(--secondary); }

/* Results Tables */
.results-table {
  width: 100%;
  font-size: 0.8125rem;
  border-collapse: collapse;
  margin: 0.75rem 0;
}
.results-table th,
.results-table td {
  padding: 0.5rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}
.results-table th {
  font-weight: 600;
  color: var(--gray-600);
  background: var(--gray-50);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.results-table td {
  color: var(--gray-800);
}
.results-table td:last-child {
  font-weight: 600;
  text-align: right;
}
.results-table tbody tr:hover {
  background: var(--gray-50);
}
.results-table .highlight-row {
  background: var(--primary-bg);
}
.results-table .highlight-row td {
  font-weight: 600;
  color: var(--primary-dark);
}

/* Input Summary */
.input-summary {
  background: var(--gray-50);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.8125rem;
}
.input-summary h4 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin: 0 0 0.5rem 0;
}
.input-summary-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}
.input-summary-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}
.input-summary-label {
  color: var(--gray-500);
}
.input-summary-value {
  font-weight: 600;
  color: var(--gray-800);
}

/* Tips Grid */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin: 1rem 0;
}
@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-left: 3px solid var(--primary);
}
.tip-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: var(--primary-bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-dark);
}
.tip-icon svg {
  width: 18px;
  height: 18px;
}
.tip-content h5 {
  margin: 0 0 0.25rem 0;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--gray-800);
}
.tip-content p {
  margin: 0;
  font-size: 0.75rem;
  color: var(--gray-600);
  line-height: 1.4;
}

/* What This Means Box */
.interpretation-box {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid #bae6fd;
  border-radius: var(--radius-md);
  padding: 1rem;
  margin: 1rem 0;
}
.interpretation-box h4 {
  margin: 0 0 0.5rem 0;
  font-size: 0.875rem;
  font-weight: 600;
  color: #0369a1;
}
.interpretation-box p {
  margin: 0;
  font-size: 0.8125rem;
  color: #0c4a6e;
  line-height: 1.5;
}
.interpretation-box ul {
  margin: 0.5rem 0 0 0;
  padding-left: 1.25rem;
  font-size: 0.8125rem;
  color: #0c4a6e;
}
.interpretation-box li {
  margin-bottom: 0.25rem;
}

/* Print Button */
.print-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.75rem;
  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;
  margin-top: 0.75rem;
}
.print-btn:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
  color: var(--gray-800);
}
.print-btn svg {
  width: 14px;
  height: 14px;
}

/* Enhanced Results Section Container */
.enhanced-results {
  max-width: 800px;
  margin: 1.5rem auto 0;
  padding: 1.25rem;
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  display: none;
}
.enhanced-results.visible {
  display: block;
  animation: fadeIn 0.3s ease;
}
.enhanced-results h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-800);
  margin: 1.25rem 0 0.75rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-200);
}
.enhanced-results h3:first-child {
  margin-top: 0;
}

/* Collapsible Formula */
.formula-details {
  margin-top: 0.75rem;
}
.formula-toggle {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-500);
  background: var(--gray-50);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}
.formula-toggle:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}
.formula-toggle svg {
  width: 12px;
  height: 12px;
  transition: transform 0.2s ease;
}
.formula-toggle.open svg {
  transform: rotate(180deg);
}
.formula-content {
  display: none;
  margin-top: 0.5rem;
  padding: 0.75rem;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--gray-600);
  line-height: 1.6;
}
.formula-content.open {
  display: block;
}

/* External link icon */
a[target="_blank"]::after {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: 3px;
  vertical-align: middle;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23d97706' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 13v6a2 2 0 01-2 2H5a2 2 0 01-2-2V8a2 2 0 012-2h6'/%3E%3Cpolyline points='15 3 21 3 21 9'/%3E%3Cline x1='10' y1='14' x2='21' y2='3'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
}
.logo a[target="_blank"]::after,
.footer a[target="_blank"]::after,
.nav-desktop a[target="_blank"]::after,
.nav-mobile a[target="_blank"]::after { display: none; }

/* Related Articles (blog post bottoms) */
.related-articles {
  border-top: 2px solid var(--gray-200);
  margin-top: 2.5rem;
  padding-top: 1.5rem;
}
.related-articles h2 {
  font-size: 1.25rem;
  margin-top: 0;
}

/* Source note (table citations) */
.source-note {
  font-size: 0.8125rem;
  font-style: italic;
  color: var(--gray-500);
  margin-top: 0.5rem;
}

/* Blog category tags */
.blog-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 0.5rem;
}
.blog-category-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--primary-dark);
  border: 1.5px solid var(--primary-light);
  border-radius: var(--radius-full);
  background: var(--primary-bg);
}

/* Print */
@media print {
  .header, .footer, .calculate-btn, .action-btn, .cta-box, .nav-toggle, .calc-tabs, .print-btn, .formula-toggle { display: none !important; }
  a[target="_blank"]::after { display: none !important; }
  body { background: white; }
  .calculator-card, .enhanced-results, .content-section { box-shadow: none; max-width: 100%; }
  .results-section, .enhanced-results { display: block !important; }
  .calc-panel { display: block !important; padding: 0; }
  .result-primary { border: 2px solid var(--gray-300); }
  .breakdown-bar { print-color-adjust: exact; -webkit-print-color-adjust: exact; }
  .tip-card { break-inside: avoid; }
}