/* Calculator styles - preserved from original, scoped under #calculator-app */
#calculator-app .container { max-width: 1200px; margin: 0 auto; padding: 20px; }
#calculator-app .header { text-align: center; color: #1e3c72; margin-bottom: 30px; }
#calculator-app .header h1 { font-size: 2.5rem; margin-bottom: 10px; text-shadow: 2px 2px 4px rgba(0,0,0,0.1); color: #ffffff; }
#calculator-app .header p { font-size: 1.2rem; opacity: 0.9; color: #e0e0e0; }
#calculator-app .calculator-container { background: white; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.2); overflow: hidden; }
#calculator-app .tabs { display: flex; background: #f8f9fa; border-bottom: 1px solid #dee2e6; overflow-x: auto; }
#calculator-app .tabs { max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: thin; }
#calculator-app { max-width: 100%; overflow-x: hidden; }
#calculator-app .tab { flex-shrink: 0; white-space: nowrap; }

#calculator-app .tab { flex: 1 0 auto; padding: 15px 20px; background: none; border: none; cursor: pointer; font-size: 16px; font-weight: 500; color: #6c757d; transition: all 0.3s ease; position: relative; white-space: nowrap; }
#calculator-app .tab.active { color: #007bff; background: white; }
#calculator-app .tab.active::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px; background: #007bff; }
#calculator-app .tab:hover { background: #e9ecef; }
#calculator-app .tab-content { display: none; padding: 30px; }
#calculator-app .tab-content.active { display: block; }
#calculator-app .form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-bottom: 25px; }
#calculator-app .form-group { margin-bottom: 20px; }
#calculator-app .form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #495057; }
#calculator-app .form-group input, #calculator-app .form-group select { width: 100%; padding: 12px 15px; border: 2px solid #e9ecef; border-radius: 8px; font-size: 16px; transition: border-color 0.3s ease; }
#calculator-app .form-group input:focus, #calculator-app .form-group select:focus { outline: none; border-color: #007bff; box-shadow: 0 0 0 3px rgba(0,123,255,0.1); }
#calculator-app .btn { background: linear-gradient(135deg, #007bff, #0056b3); color: white; border: none; padding: 12px 24px; border-radius: 8px; cursor: pointer; font-size: 16px; font-weight: 600; transition: all 0.3s ease; display: inline-flex; align-items: center; gap: 8px; }
#calculator-app .btn:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(0,123,255,0.3); }
#calculator-app .btn-secondary { background: linear-gradient(135deg, #6c757d, #545b62); }
#calculator-app .btn-success { background: linear-gradient(135deg, #28a745, #1e7e34); }
#calculator-app .btn-warning { background: linear-gradient(135deg, #ffc107, #e0a800); color: #212529; }
#calculator-app .btn-danger { background: linear-gradient(135deg, #dc3545, #c82333); }
#calculator-app .summary-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-top: 20px; }
#calculator-app .summary-card { background: white; padding: 20px; border-radius: 10px; text-align: center; border: 2px solid #e9ecef; transition: all 0.3s ease; }
#calculator-app .summary-card:hover { border-color: #007bff; transform: translateY(-2px); }
#calculator-app .summary-card h4 { color: #6c757d; font-size: 14px; margin-bottom: 10px; text-transform: uppercase; letter-spacing: 1px; }
#calculator-app .summary-card .amount { font-size: 24px; font-weight: bold; color: #007bff; }
#calculator-app .material-item { background: white; padding: 15px; border-radius: 8px; margin-bottom: 15px; border: 1px solid #e9ecef; }
#calculator-app .material-inputs { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 15px; align-items: end; }
#calculator-app .result-section { background: linear-gradient(135deg, #28a745, #20c997); color: white; padding: 25px; border-radius: 10px; margin-top: 30px; }
#calculator-app .result-section h3 { margin-bottom: 20px; text-align: center; }
#calculator-app .about-guide-section { margin-top: 40px; background: #ffffff; border-radius: 15px; padding: 30px; box-shadow: 0 5px 15px rgba(0,0,0,0.1); }
#calculator-app .about-guide-section h2, #calculator-app .about-guide-section h3 { text-align: center; color: #343a40; margin-bottom: 30px; }
#calculator-app .about-guide-section h3 { color: #007bff; margin-top: 25px; margin-bottom: 15px; border-bottom: 2px solid #e9ecef; padding-bottom: 10px; }
#calculator-app .how-to-list { list-style-type: decimal; margin-left: 20px; text-align: left; }
#calculator-app .how-to-list li { margin-bottom: 10px; }
#calculator-app .feature-list { list-style: none; padding-left: 0; text-align: left;}
#calculator-app .feature-list li { margin-bottom: 15px; padding: 15px; background: #f8f9fa; border-radius: 8px; border-left: 4px solid #28a745; }
#calculator-app .uses-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 25px; margin-top: 25px; text-align: left;}
#calculator-app .use-card ul { list-style: none; padding-left: 0; }
#calculator-app .use-card li { margin-bottom: 8px; padding-left: 20px; position: relative; }
#calculator-app .use-card li::before { content: '✓'; position: absolute; left: 0; color: #28a745; font-weight: bold; }
#calculator-app .tabs-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; margin-bottom: 0; padding: 0 20px; }
#calculator-app .header-controls { display: flex; gap: 10px; align-items: center; }
#calculator-app .currency-selector, #calculator-app .language-selector { padding: 8px 12px; border: 1px solid #ddd; border-radius: 6px; background: white; font-size: 14px; cursor: pointer; min-width: 120px; color: #495057; }
#calculator-app .currency-selector:focus, #calculator-app .language-selector:focus { outline: none; border-color: #007bff; box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25); }
#calculator-app .success, #calculator-app .error { padding: 15px; border-radius: 8px; margin-bottom: 20px; border: 1px solid transparent; font-weight: 500; }
#calculator-app .success { background-color: #d4edda; color: #155724; border-color: #c3e6cb; }
#calculator-app .error { background-color: #f8d7da; color: #721c24; border-color: #f5c6cb; }
#calculator-app .calculator-navigation { display: flex; justify-content: space-between; align-items: center; margin-top: 30px; padding-top: 20px; border-top: 2px solid #e9ecef; }
#calculator-app .tab-navigation { display: flex; gap: 10px; }
#calculator-app .btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none !important; box-shadow: none !important; }
#calculator-app .user-note { background: #e3f2fd; border-left: 4px solid #1976d2; padding: 15px; margin-bottom: 20px; border-radius: 4px; text-align: left; }
#calculator-app .user-note p { margin: 0; color: #0d47a1; line-height: 1.5; }
#calculator-app .user-note strong { color: #0d47a1; }
#calculator-app .user-note ul { list-style-type: disc; padding-left: 20px; margin-top: 10px; }
#calculator-app .quantity-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-bottom: 25px; }
#calculator-app .quantity-item { background: white; border-radius: 10px; padding: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); border: 1px solid #e9ecef; }
#calculator-app .quantity-header { display: flex; align-items: center; gap: 10px; margin-bottom: 15px; padding-bottom: 10px; border-bottom: 2px solid #f8f9fa; }
#calculator-app .quantity-header i { color: #007bff; }
#calculator-app .quantity-details { display: flex; flex-direction: column; gap: 10px; }
#calculator-app .standard-qty { background: #e3f2fd; padding: 8px 12px; border-radius: 6px; border-left: 4px solid #2196f3; }
#calculator-app .standard-qty span { font-weight: 600; color: #1976d2; font-size: 14px; }
#calculator-app .custom-area, #calculator-app .unit-cost { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
#calculator-app .custom-area label, #calculator-app .unit-cost label { font-size: 13px; color: #6c757d; font-weight: 500; min-width: 90px; }
#calculator-app .custom-area input, #calculator-app .unit-cost input { flex: 1; padding: 6px 10px; border: 1px solid #ced4da; border-radius: 4px; font-size: 13px; }
#calculator-app .calculated-qty, #calculator-app .total-cost { background: #f8f9fa; padding: 8px 12px; border-radius: 6px; border: 1px solid #e9ecef; }
#calculator-app .total-cost span { color: #28a745; }
#calculator-app .material-summary-total { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: center; background: linear-gradient(135deg, #007bff, #0056b3); border-radius: 10px; padding: 15px 20px; margin-top: 10px; }
#calculator-app .total-label, #calculator-app .total-amount { color: white; font-weight: bold; }
#calculator-app .labor-category-section { margin-bottom: 25px; border: 1px solid #e9ecef; border-radius: 15px; padding: 20px; background: #ffffff; box-shadow: 0 2px 4px rgba(0,0,0,0.05); }
#calculator-app .labor-breakdown { background: #f8f9fa; border-radius: 10px; padding: 15px; margin-top: 15px; border: 1px solid #dee2e6; }
#calculator-app .breakdown-item { display: flex; justify-content: space-between; padding: 8px 0; font-size: 14px; border-bottom: 1px solid #e9ecef; }
#calculator-app .breakdown-item:last-child { border-bottom: none; }
#calculator-app .cost-display { background-color: #e8f5e8 !important; color: #1e7e34 !important; font-weight: bold !important; text-align: center; }
#calculator-app .total-labor-section { background: linear-gradient(135deg, #28a745, #20c997); border-radius: 15px; padding: 25px; margin: 25px 0; color: white; }
#calculator-app .simple-total-grid { background: rgba(255, 255, 255, 0.15); border-radius: 12px; padding: 25px; }
#calculator-app .total-item { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.2); }
#calculator-app .total-item.total-final { border-top: 2px solid rgba(255, 255, 255, 0.4); padding-top: 20px; margin-top: 15px; font-weight: bold; font-size: 20px; }
#calculator-app .additional-materials-section { background: #f8f9fa; border-radius: 10px; padding: 25px; margin-top: 25px; border: 1px solid #e9ecef; }
#calculator-app .additional-material-item { background: white; border-radius: 8px; padding: 20px; margin-bottom: 15px; border: 1px solid #dee2e6; }
#calculator-app .additional-material-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px; }
#calculator-app .material-name-input { width: 100%; padding: 10px; border: 1px solid #ced4da; border-radius: 6px; margin-bottom: 15px; font-weight: bold; }
#calculator-app .additional-material-inputs { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; }
#calculator-app .additional-material-total { background: #e7f3ff; padding: 10px 15px; border-radius: 6px; font-weight: bold; color: #0066cc; text-align: center; margin-top: 15px; }
#calculator-app /* Save/Load Modal Styles */
        .modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.5); align-items: center; justify-content: center; }
#calculator-app .modal-content { background-color: white; padding: 30px; border-radius: 15px; width: 90%; max-width: 500px; text-align: center;}
#calculator-app .modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; padding-bottom: 15px; border-bottom: 2px solid #e9ecef; }
#calculator-app .modal-header h3 { color: #495057; margin: 0; flex-grow: 1; }
#calculator-app .close-btn { background: none; border: none; font-size: 28px; cursor: pointer; color: #6c757d; }
#calculator-app .save-options { display: flex; flex-direction: column; gap: 15px; }
#calculator-app .save-options .btn { width: 100%; justify-content: center; }
#calculator-app /* Saved Reports Section */
        .saved-reports-section { margin-top: 30px; background: #f8f9fa; border-radius: 15px; padding: 30px; border: 1px solid #e9ecef; }
#calculator-app .saved-reports-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; flex-wrap: wrap; gap: 15px; }
#calculator-app .saved-reports-list { max-height: 250px; overflow-y: auto; }
#calculator-app .report-item { background: white; border: 1px solid #dee2e6; border-radius: 8px; padding: 10px 15px; margin-bottom: 10px; display: flex; justify-content: space-between; align-items: center; }
#calculator-app .report-name { font-weight: 500; color: #495057; }
#calculator-app .report-actions { display: flex; gap: 10px; }
#calculator-app .report-actions .btn { padding: 5px 10px; font-size: 14px; }
#calculator-app /* Legal Documents Styles */
        .legal-docs-section { margin-top: 20px; }
#calculator-app .legal-docs-section h3 { color: #007bff; margin-bottom: 20px; border-bottom: 2px solid #e9ecef; padding-bottom: 10px; }

@media (max-width: 768px) {
#calculator-app .tabs { flex-wrap: nowrap; }
#calculator-app .form-grid, #calculator-app .summary-grid, #calculator-app .uses-grid { grid-template-columns: 1fr; }
#calculator-app .tabs-header { flex-direction: column; align-items: stretch; padding: 10px; }

        
}


/* ---- INDUSTRIAL THEME OVERRIDES (Dark + Light) ---- */
#calculator-app { color: var(--text); }
#calculator-app .container { max-width: 100%; padding: 0; }

/* Calculator card container */
#calculator-app .calculator-container {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0;
  box-shadow: none;
}

/* Tabs */
#calculator-app .tabs { background: var(--surface); border-bottom: 1px solid var(--border); }
#calculator-app .tab { color: var(--text-muted); font-family: 'Barlow', sans-serif; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; }
#calculator-app .tab:hover { background: var(--surface-2); color: var(--text); }
#calculator-app .tab.active { background: var(--card); color: var(--primary); }
#calculator-app .tab.active::after { background: var(--primary); height: 3px; }

/* Form elements */
#calculator-app .form-group label { color: var(--text); }
#calculator-app .form-group input,
#calculator-app .form-group select {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
  border-radius: 0;
}
#calculator-app .form-group input:focus,
#calculator-app .form-group select:focus { border-color: var(--primary); box-shadow: 0 0 0 2px color-mix(in srgb, var(--primary) 20%, transparent); }
#calculator-app .form-group input::placeholder { color: var(--text-muted); opacity: 0.6; }

/* Buttons */
#calculator-app .btn {
  background: var(--primary);
  color: #000;
  border-radius: 0;
  border: 2px solid var(--primary);
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
#calculator-app .btn:hover { background: transparent; color: var(--primary); transform: translateY(-1px); box-shadow: 3px 3px 0 var(--primary); }
#calculator-app .btn-secondary { background: transparent; color: var(--text); border-color: var(--border-strong); }
#calculator-app .btn-secondary:hover { color: var(--primary); border-color: var(--primary); box-shadow: 3px 3px 0 var(--primary); }
#calculator-app .btn-success { background: var(--success); border-color: var(--success); color: #000; }
#calculator-app .btn-success:hover { color: var(--success); background: transparent; box-shadow: 3px 3px 0 var(--success); }
#calculator-app .btn-warning { background: var(--accent); border-color: var(--accent); color: #000; }
#calculator-app .btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }

/* Cards & sections */
#calculator-app .quantity-item,
#calculator-app .material-item,
#calculator-app .labor-category-section,
#calculator-app .additional-materials-section,
#calculator-app .additional-material-item,
#calculator-app .summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0;
  color: var(--text);
}
#calculator-app .quantity-header i,
#calculator-app .material-item h4 i { color: var(--primary); }
#calculator-app .quantity-header { border-bottom-color: var(--border); }

/* Inputs inside quantity items */
#calculator-app .custom-area input,
#calculator-app .unit-cost input { background: transparent; border-color: var(--border-strong); color: var(--text); border-radius: 0; }
#calculator-app .custom-area label, #calculator-app .unit-cost label { color: var(--text-muted); }

/* Standard qty banner */
#calculator-app .standard-qty { background: color-mix(in srgb, var(--primary) 10%, transparent); border-left-color: var(--primary); }
#calculator-app .standard-qty span { color: var(--primary); }

#calculator-app .calculated-qty, #calculator-app .total-cost { background: var(--surface-2); border-color: var(--border); color: var(--text); }
#calculator-app .total-cost span { color: var(--primary); font-weight: 700; }

/* Cost display readonly */
#calculator-app .cost-display { background-color: color-mix(in srgb, var(--primary) 12%, transparent) !important; color: var(--primary) !important; border-color: var(--primary) !important; }

/* Total sections */
#calculator-app .total-labor-section {
  background: var(--primary);
  color: #000;
  border-radius: 0;
}
#calculator-app .total-labor-section h4 { color: #000; }
#calculator-app .simple-total-grid { background: rgba(0,0,0,0.1); border-radius: 0; }
#calculator-app .total-item { border-bottom-color: rgba(0,0,0,0.2); color: #000; }
#calculator-app .total-item.total-final { border-top-color: rgba(0,0,0,0.4); }
#calculator-app .total-value, #calculator-app .total-label { color: #000; }

#calculator-app .material-summary-total { background: var(--primary); border-radius: 0; }
#calculator-app .material-summary-total .total-label,
#calculator-app .material-summary-total .total-amount { color: #000; }

/* Summary cards */
#calculator-app .summary-card { background: var(--surface); border-color: var(--border); }
#calculator-app .summary-card:hover { border-color: var(--primary); transform: translateY(-2px); }
#calculator-app .summary-card h4 { color: var(--text-muted); }
#calculator-app .summary-card .amount { color: var(--primary); font-family: 'Barlow', sans-serif; }

/* Result section (total cost) */
#calculator-app .result-section {
  background: var(--primary);
  color: #000;
  border-radius: 0;
}
#calculator-app .result-section h3, #calculator-app .result-section h4 { color: #000; }

/* User notes */
#calculator-app .user-note { background: color-mix(in srgb, var(--primary) 8%, transparent); border-left-color: var(--primary); border-radius: 0; }
#calculator-app .user-note p, #calculator-app .user-note strong, #calculator-app .user-note li { color: var(--text); }

/* Currency & Language selectors */
#calculator-app .currency-selector, #calculator-app .language-selector {
  background: transparent; border-color: var(--border-strong); color: var(--text); border-radius: 0;
}
#calculator-app .tabs-header { background: var(--surface); }

/* Labor breakdown */
#calculator-app .labor-breakdown { background: var(--surface-2); border-color: var(--border); border-radius: 0; }
#calculator-app .labor-breakdown .breakdown-item { color: var(--text); border-bottom-color: var(--border); }

/* Additional material items */
#calculator-app .additional-material-total { background: color-mix(in srgb, var(--primary) 10%, transparent); color: var(--primary); border-radius: 0; }
#calculator-app .material-name-input { background: transparent; color: var(--text); border-color: var(--border-strong); border-radius: 0; }

/* About guide section */
#calculator-app .about-guide-section { background: var(--card); border: 1px solid var(--border); border-radius: 0; padding: 32px; }
#calculator-app .about-guide-section h2, #calculator-app .about-guide-section h3, #calculator-app .about-guide-section h4 { color: var(--text); border-bottom-color: var(--border); }
#calculator-app .about-guide-section h3 { color: var(--primary); }
#calculator-app .about-guide-section h4 { color: var(--primary) !important; }
#calculator-app .about-guide-section p, #calculator-app .about-guide-section li { color: var(--text-muted); }
#calculator-app .about-guide-section strong { color: var(--text); }

/* Modal */
#calculator-app .modal-content { background: var(--surface); color: var(--text); border-radius: 0; border: 1px solid var(--primary); box-shadow: 8px 8px 0 var(--primary); }
#calculator-app .modal-header { border-bottom-color: var(--border); }
#calculator-app .modal-header h3 { color: var(--text); }
#calculator-app .close-btn { color: var(--text); }

/* Saved reports */
#calculator-app .saved-reports-section { background: var(--surface); border-color: var(--border); border-radius: 0; }
#calculator-app .report-item { background: var(--card); border-color: var(--border); border-radius: 0; }
#calculator-app .report-name { color: var(--text); }

/* Legal docs section headers */
#calculator-app .legal-docs-section h3 { color: var(--primary); border-bottom-color: var(--border); }

/* Overhead/Profit banners */
#calculator-app .quantity-calculator-section h4 span { color: var(--text-muted) !important; }

/* Calculator navigation */
#calculator-app .calculator-navigation { border-top-color: var(--border); flex-wrap: wrap; gap: 16px; }

/* Feature lists */
#calculator-app .feature-list li { background: var(--surface); border-left-color: var(--primary); color: var(--text); border-radius: 0; }


/* =============================================================================
   DARK MODE VISIBILITY FIXES — Phase 3
   Root-cause overrides for hardcoded legacy light-theme colors above.
   Nothing else changed (layouts, spacing, formulas, math untouched).
   ============================================================================= */

/* System-level dark hint for native form controls (native select popup, spinners) */
[data-theme="dark"] { color-scheme: dark; }
[data-theme="light"] { color-scheme: light; }

/* ---- Inputs / selects / textareas ---- */
[data-theme="dark"] #calculator-app input[type="text"],
[data-theme="dark"] #calculator-app input[type="number"],
[data-theme="dark"] #calculator-app input[type="email"],
[data-theme="dark"] #calculator-app input[type="search"],
[data-theme="dark"] #calculator-app select,
[data-theme="dark"] #calculator-app textarea {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}
[data-theme="dark"] #calculator-app input:focus,
[data-theme="dark"] #calculator-app select:focus,
[data-theme="dark"] #calculator-app textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 20%, transparent);
}
[data-theme="dark"] #calculator-app input::placeholder,
[data-theme="dark"] #calculator-app textarea::placeholder {
  color: color-mix(in srgb, var(--text-muted) 80%, transparent);
  opacity: 1;
}
[data-theme="dark"] #calculator-app select option {
  background: var(--surface);
  color: var(--text);
}

/* Native currency + language selectors in the header of the calculator */
[data-theme="dark"] #calculator-app .currency-selector,
[data-theme="dark"] #calculator-app .language-selector {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border-strong);
}

/* ---- Labels & headings ---- */
[data-theme="dark"] #calculator-app .form-group label,
[data-theme="dark"] #calculator-app .about-guide-section h2,
[data-theme="dark"] #calculator-app .about-guide-section h3 {
  color: var(--text);
}
[data-theme="dark"] #calculator-app .header h1,
[data-theme="dark"] #calculator-app .header p {
  color: var(--text);
}
[data-theme="dark"] #calculator-app .header p { color: var(--text-muted); }

/* ---- Cards / sections that had hardcoded white/light backgrounds ---- */
[data-theme="dark"] #calculator-app .calculator-container { background: var(--card); }
[data-theme="dark"] #calculator-app .tabs {
  background: var(--surface);
  border-bottom-color: var(--border);
}
[data-theme="dark"] #calculator-app .tab { color: var(--text-muted); }
[data-theme="dark"] #calculator-app .tab.active { color: var(--primary); background: var(--card); }
[data-theme="dark"] #calculator-app .tab:hover { background: var(--surface-2); color: var(--text); }
[data-theme="dark"] #calculator-app .summary-card { background: var(--card); border-color: var(--border-strong); }
[data-theme="dark"] #calculator-app .summary-card:hover { border-color: var(--primary); }
[data-theme="dark"] #calculator-app .summary-card h4 { color: var(--text-muted); }
[data-theme="dark"] #calculator-app .summary-card .amount { color: var(--primary); }
[data-theme="dark"] #calculator-app .material-item {
  background: var(--card); color: var(--text); border-color: var(--border);
}
[data-theme="dark"] #calculator-app .material-item h4 { color: var(--text); }
[data-theme="dark"] #calculator-app .quantity-item {
  background: var(--card); border-color: var(--border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.35);
}
[data-theme="dark"] #calculator-app .quantity-header i { color: var(--primary); }
[data-theme="dark"] #calculator-app .quantity-header .quantity-name { color: var(--text); }
[data-theme="dark"] #calculator-app .quantity-header .quantity-unit { color: var(--text-muted); }
[data-theme="dark"] #calculator-app .quantity-info-text { color: var(--text-muted); }
[data-theme="dark"] #calculator-app .standard-qty {
  background: color-mix(in srgb, var(--primary) 10%, var(--surface));
  border-left-color: var(--primary);
}
[data-theme="dark"] #calculator-app .standard-qty span { color: var(--primary); }
[data-theme="dark"] #calculator-app .custom-area label,
[data-theme="dark"] #calculator-app .unit-cost label { color: var(--text-muted); }
[data-theme="dark"] #calculator-app .custom-area input,
[data-theme="dark"] #calculator-app .unit-cost input {
  background: var(--surface); color: var(--text); border-color: var(--border);
}
[data-theme="dark"] #calculator-app .calculated-qty,
[data-theme="dark"] #calculator-app .total-cost {
  background: var(--surface); border-color: var(--border); color: var(--text);
}
[data-theme="dark"] #calculator-app .calculated-qty span,
[data-theme="dark"] #calculator-app .total-cost span { color: var(--primary); }
[data-theme="dark"] #calculator-app .labor-category-section {
  background: var(--card); border-color: var(--border);
}
[data-theme="dark"] #calculator-app .labor-breakdown {
  background: var(--surface); border-color: var(--border);
}
[data-theme="dark"] #calculator-app .labor-breakdown label { color: var(--text-muted); }
[data-theme="dark"] #calculator-app .labor-breakdown input {
  background: var(--card); color: var(--text); border-color: var(--border);
}
[data-theme="dark"] #calculator-app .cost-display {
  background-color: color-mix(in srgb, var(--primary) 15%, var(--surface)) !important;
  color: var(--primary) !important;
}
[data-theme="dark"] #calculator-app .total-labor-section {
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 25%, var(--card)), var(--card));
  color: var(--text);
}
[data-theme="dark"] #calculator-app .simple-total-grid { background: rgba(255,255,255,0.06); }

/* ---- Result section / grand total banner ---- */
[data-theme="dark"] #calculator-app .result-section {
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 30%, var(--card)), var(--card));
  color: var(--text);
  border: 1px solid var(--border-strong);
}
[data-theme="dark"] #calculator-app .material-summary-total {
  background: linear-gradient(135deg, color-mix(in srgb, var(--primary) 40%, var(--card)), var(--card));
}
[data-theme="dark"] #calculator-app .total-label,
[data-theme="dark"] #calculator-app .total-amount { color: var(--text); }

/* ---- About / user notes ---- */
[data-theme="dark"] #calculator-app .about-guide-section {
  background: var(--card); border: 1px solid var(--border);
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}
[data-theme="dark"] #calculator-app .feature-list li {
  background: var(--surface); color: var(--text);
}
[data-theme="dark"] #calculator-app .use-card { background: var(--surface); color: var(--text); border-color: var(--border); }
[data-theme="dark"] #calculator-app .use-card h4 { color: var(--primary); }
[data-theme="dark"] #calculator-app .use-card li::before { color: var(--primary); }
[data-theme="dark"] #calculator-app .user-note {
  background: color-mix(in srgb, var(--primary) 8%, var(--surface));
  border-left-color: var(--primary);
}
[data-theme="dark"] #calculator-app .user-note p,
[data-theme="dark"] #calculator-app .user-note strong { color: var(--text); }

/* ---- Modals & popovers (save/report chooser) ---- */
[data-theme="dark"] #saveOptionsModal .modal-content,
[data-theme="dark"] .modal-content {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border-strong);
}
[data-theme="dark"] .modal-close { color: var(--text); }

/* ---- Table borders inside intelligence / conversion tables ---- */
[data-theme="dark"] #calculator-app table { color: var(--text); }
[data-theme="dark"] #calculator-app th { background: var(--surface); color: var(--text); border-color: var(--border); }
[data-theme="dark"] #calculator-app td { border-color: var(--border); }

/* ---- Btn overrides (kept accessible; not "forced" — same visual family, dark-safe) ---- */
[data-theme="dark"] #calculator-app .btn-warning {
  background: linear-gradient(135deg, var(--primary), color-mix(in srgb, var(--primary) 70%, black));
  color: #000;
}
[data-theme="dark"] #calculator-app .btn-secondary {
  background: linear-gradient(135deg, var(--surface-2), var(--surface));
  color: var(--text);
}

/* ---- Icon accents ---- */
[data-theme="dark"] #calculator-app i { color: inherit; }
[data-theme="dark"] #calculator-app .fas.fa-check { color: var(--primary); }

/* ---- Ad slot & disclaimer text ---- */
[data-theme="dark"] .ad-slot { background: var(--surface); color: var(--text-muted); border-color: var(--border); }

/* ---- Focus visible (WCAG 2.1) ---- */
[data-theme="dark"] #calculator-app *:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ---- Hover on tabs, buttons in dark ---- */
[data-theme="dark"] #calculator-app .btn:hover { filter: brightness(1.1); }

/* ---- Disabled state visibility ---- */
[data-theme="dark"] #calculator-app input:disabled,
[data-theme="dark"] #calculator-app select:disabled,
[data-theme="dark"] #calculator-app button:disabled {
  background: var(--surface-2);
  color: var(--text-muted);
  border-color: var(--border);
  opacity: 0.65;
  cursor: not-allowed;
}

/* ========================================================================
   Iter 14 · Extended Materials — controls, cards, disclaimer
   Preserves the existing quantity-item visual style; only adds new
   inline-input layout for "Estimated standard consumption" + waste allowance.
   ======================================================================== */

/* Region + Area Unit + Currency selector strip at top of estimator */
#calculator-app .mat-ext-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  padding: 16px;
  margin-bottom: 20px;
  background: var(--surface, #f8f9fa);
  border: 1px solid var(--border, #e9ecef);
  border-left: 4px solid var(--primary, #FFB800);
  border-radius: 6px;
}
#calculator-app .mat-ext-ctrl {
  display: flex; flex-direction: column; gap: 6px;
}
#calculator-app .mat-ext-ctrl label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted, #6c757d);
}
#calculator-app .mat-ext-hint {
  text-transform: none;
  letter-spacing: 0;
  font-weight: 400;
  color: var(--text-muted, #6c757d);
  opacity: 0.8;
}
#calculator-app .mat-ext-ctrl select {
  padding: 10px 12px;
  border: 1px solid var(--border-strong, #ced4da);
  border-radius: 4px;
  font-size: 14px;
  background: var(--input-bg, #ffffff);
  color: var(--text, #212529);
  min-height: 44px;
}
#calculator-app .mat-ext-ctrl select:focus {
  outline: 3px solid var(--primary, #FFB800);
  outline-offset: 2px;
  border-color: var(--primary, #FFB800);
}
#calculator-app .mat-ext-info-value {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  border: 1px dashed var(--border-strong, #ced4da);
  border-radius: 4px;
  min-height: 44px;
  color: var(--text, #212529);
}
#calculator-app .mat-ext-info-value i { color: var(--primary, #FFB800); }
#calculator-app .mat-ext-info-value small { color: var(--text-muted, #6c757d); font-size: 11px; margin-left: auto; }

/* Extended material card — consumption input row (inline label + input + UOM) */
#calculator-app .mat-ext-item .standard-qty {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
}
#calculator-app .mat-ext-item .standard-qty label {
  flex: 1 1 100%;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary, #1976d2);
  margin-bottom: 4px;
}
#calculator-app .mat-ext-item .standard-qty input[type="number"] {
  flex: 1 1 auto;
  padding: 6px 10px;
  border: 1px solid var(--border-strong, #ced4da);
  border-radius: 4px;
  font-size: 13px;
  background: var(--input-bg, #ffffff);
  color: var(--text, #212529);
  min-width: 80px;
}
#calculator-app .mat-ext-item .standard-qty .mat-ext-uom {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--text-muted, #6c757d);
  font-weight: 600;
  min-width: 40px;
}
#calculator-app .mat-ext-item .standard-qty .mat-ext-per {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-muted, #6c757d);
  font-size: 11px;
  margin-left: 6px;
}

/* Waste allowance selector (Tiles only) */
#calculator-app .mat-ext-item .mat-ext-waste select {
  flex: 1;
  padding: 6px 10px;
  border: 1px solid var(--border-strong, #ced4da);
  border-radius: 4px;
  font-size: 13px;
  background: var(--input-bg, #ffffff);
  color: var(--text, #212529);
  min-height: 36px;
}
#calculator-app .mat-ext-item .mat-ext-waste select:focus {
  outline: 3px solid var(--primary, #FFB800);
  outline-offset: 1px;
  border-color: var(--primary, #FFB800);
}

/* Disclaimer below the total */
#calculator-app .mat-ext-disclaimer {
  margin-top: 16px;
  padding: 14px 18px;
  background: color-mix(in srgb, var(--primary, #FFB800) 8%, transparent);
  border: 1px dashed color-mix(in srgb, var(--primary, #FFB800) 45%, transparent);
  border-radius: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text, #212529);
}
#calculator-app .mat-ext-disclaimer i {
  color: var(--primary, #FFB800);
  margin-right: 8px;
}
#calculator-app .mat-ext-disclaimer strong { color: var(--primary, #FFB800); }

/* Responsive breakpoints — 4/2/1 columns per user spec */
@media (min-width: 1400px) {
  #calculator-app .quantity-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 900px) and (max-width: 1399.98px) {
  #calculator-app .quantity-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 601px) and (max-width: 899.98px) {
  #calculator-app .quantity-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  #calculator-app .quantity-grid { grid-template-columns: 1fr; }
}

/* Dark-mode overrides */
[data-theme="dark"] #calculator-app .mat-ext-controls {
  background: var(--surface, #18181b);
  border-color: var(--border, #2a2a2e);
  border-left-color: var(--primary, #FFB800);
}
[data-theme="dark"] #calculator-app .mat-ext-ctrl select,
[data-theme="dark"] #calculator-app .mat-ext-item .standard-qty input[type="number"],
[data-theme="dark"] #calculator-app .mat-ext-item .mat-ext-waste select {
  background: var(--input-bg, #1a1a1f);
  border-color: var(--border-strong, #3f3f46);
  color: var(--text, #ffffff);
}
[data-theme="dark"] #calculator-app .mat-ext-item .standard-qty label { color: var(--primary, #FFB800); }
[data-theme="dark"] #calculator-app .mat-ext-info-value { border-color: var(--border-strong, #3f3f46); color: var(--text, #fff); }
[data-theme="dark"] #calculator-app .mat-ext-disclaimer { color: var(--text, #fff); }

/* Print — keep disclaimer visible in reports */
@media print {
  #calculator-app .mat-ext-controls,
  #calculator-app .mat-ext-item .mat-ext-waste { display: none !important; }
  #calculator-app .mat-ext-disclaimer { break-inside: avoid; page-break-inside: avoid; }
}

/* Reduced-motion — no transitions */
@media (prefers-reduced-motion: reduce) {
  #calculator-app .mat-ext-item * { transition: none !important; animation: none !important; }
}

/* =============================================================================
   ITERATION 15 · TASK 1 — DESIGN MODERNIZATION POLISH
   Purely visual refinements. No layout structure removed, no functionality
   touched. Applies to all six tabs equally. Respects brand palette
   (Hazard Yellow #FFB800 · Obsidian Black) and industrial character.
   ============================================================================= */

/* ── 1. Tab-content breathing room + section rhythm ───────────────────────── */
#calculator-app .tab-content {
  padding: 36px 40px;
}
#calculator-app .tab-content > h2,
#calculator-app .tab-content > h3 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.65rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 0 0 8px 0;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}
#calculator-app .tab-content > h2 i,
#calculator-app .tab-content > h3 i {
  color: var(--primary);
  font-size: 1.1rem;
}
#calculator-app .tab-content > h2 + .form-grid,
#calculator-app .tab-content > h3 + .user-note,
#calculator-app .tab-content > h3 + .labor-category-section,
#calculator-app .tab-content > h3 + .material-item,
#calculator-app .tab-content > h3 + .form-grid,
#calculator-app .tab-content > h3 + .summary-grid,
#calculator-app .tab-content > h2 + .quantity-calculator-section {
  margin-top: 28px;
}

/* ── 2. Tabs — larger touch targets, cleaner active state ────────────────── */
#calculator-app .tabs { gap: 2px; padding: 4px 4px 0 4px; }
#calculator-app .tab {
  padding: 16px 22px;
  min-height: 52px;
  font-size: 13.5px;
  letter-spacing: 0.08em;
  border-radius: 0;
  transition: color .18s ease, background .18s ease;
}
#calculator-app .tab i { margin-right: 8px; opacity: 0.85; }
#calculator-app .tab.active i { opacity: 1; }
#calculator-app .tab:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: -2px;
}
#calculator-app .tab.active::after { height: 3px; }

/* ── 3. Header controls (currency / language) ────────────────────────────── */
#calculator-app .tabs-header { padding: 12px 20px; gap: 16px; }
#calculator-app .header-controls { gap: 12px; }
#calculator-app .currency-selector,
#calculator-app .language-selector {
  min-height: 42px;
  padding: 8px 14px;
  font-size: 13.5px;
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: 0.02em;
  min-width: 140px;
}

/* ── 4. Form fields — 44 px touch targets, refined focus ring ────────────── */
#calculator-app .form-group { margin-bottom: 4px; }
#calculator-app .form-group label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}
#calculator-app .form-group input,
#calculator-app .form-group select,
#calculator-app .material-name-input {
  min-height: 46px;
  padding: 12px 14px;
  font-size: 15px;
  font-family: 'IBM Plex Sans', 'Barlow', sans-serif;
  transition: border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
#calculator-app .form-group input:hover:not(:focus),
#calculator-app .form-group select:hover:not(:focus) {
  border-color: color-mix(in srgb, var(--primary) 55%, var(--border-strong));
}
#calculator-app .form-group input:focus,
#calculator-app .form-group select:focus {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 25%, transparent);
}

/* ── 5. Buttons — uniform min-height, tighter shadow on hover ────────────── */
#calculator-app .btn {
  min-height: 46px;
  padding: 12px 22px;
  font-size: 13.5px;
  letter-spacing: 0.08em;
  gap: 10px;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease, color .12s ease;
}
#calculator-app .btn i { font-size: 0.95em; }
#calculator-app .btn:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--primary) 45%, transparent);
  outline-offset: 2px;
}

/* ── 6. Card hierarchy — refined quantity + labor + material cards ───────── */
#calculator-app .quantity-item,
#calculator-app .material-item,
#calculator-app .labor-category-section,
#calculator-app .additional-material-item {
  padding: 22px 22px 20px 22px;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
#calculator-app .quantity-item:hover,
#calculator-app .material-item:hover {
  border-color: color-mix(in srgb, var(--primary) 55%, var(--border));
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,0.18);
}
#calculator-app .quantity-header {
  padding-bottom: 14px;
  margin-bottom: 16px;
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  gap: 12px;
}
#calculator-app .quantity-header i { font-size: 1.15rem; }
#calculator-app .quantity-details { gap: 12px; }
#calculator-app .standard-qty {
  padding: 10px 14px;
  font-size: 13px;
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: 0.02em;
}
#calculator-app .custom-area,
#calculator-app .unit-cost { gap: 12px; }
#calculator-app .custom-area label,
#calculator-app .unit-cost label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  min-width: 100px;
}
#calculator-app .custom-area input,
#calculator-app .unit-cost input {
  min-height: 40px;
  padding: 8px 12px;
  font-size: 14px;
}
#calculator-app .calculated-qty,
#calculator-app .total-cost {
  padding: 10px 14px;
  font-size: 13.5px;
  font-family: 'IBM Plex Mono', monospace;
}
#calculator-app .total-cost { font-weight: 700; }

/* ── 7. Material items (Legal Docs / Equipment cards) ────────────────────── */
#calculator-app .material-item { padding: 20px 22px; margin-bottom: 18px; }
#calculator-app .material-item h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.005em;
  margin: 0 0 14px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}
#calculator-app .material-inputs { gap: 16px; }

/* ── 8. Labor category & breakdown ───────────────────────────────────────── */
#calculator-app .labor-category-section { padding: 24px; margin-bottom: 22px; }
#calculator-app .labor-category-section h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  margin: 0 0 16px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}
#calculator-app .labor-category-section h4 i { color: var(--primary); }
#calculator-app .labor-breakdown { padding: 14px 18px; }
#calculator-app .breakdown-item {
  padding: 10px 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.02em;
}

/* ── 9. Total sections (Labor / Materials / Legal) ───────────────────────── */
#calculator-app .total-labor-section { padding: 28px; }
#calculator-app .total-labor-section h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.2rem;
  margin: 0 0 18px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}
#calculator-app .simple-total-grid { padding: 20px 24px; }
#calculator-app .total-item {
  padding: 14px 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 14px;
  letter-spacing: 0.02em;
}
#calculator-app .total-item.total-final {
  font-family: 'Barlow', sans-serif;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0;
}
#calculator-app .material-summary-total {
  padding: 20px 24px;
  gap: 16px;
}
#calculator-app .material-summary-total .total-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
#calculator-app .material-summary-total .total-amount {
  font-family: 'Barlow', sans-serif;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.005em;
}

/* ── 10. Summary tab — cost cards + hero result ──────────────────────────── */
#calculator-app .summary-grid { gap: 16px; margin: 24px 0; }
#calculator-app .summary-card { padding: 22px 20px; }
#calculator-app .summary-card h4 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.14em;
  margin-bottom: 12px;
}
#calculator-app .summary-card .amount {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.005em;
}
#calculator-app .result-section { padding: 32px; }
#calculator-app .result-section h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.15rem;
  margin: 0 0 18px 0;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
}
#calculator-app .result-section > div { text-align: center; }
#calculator-app .result-section > div > div:first-child {
  font-family: 'Barlow', sans-serif;
  font-size: 3.2rem;
  letter-spacing: -0.015em;
  line-height: 1;
  margin-bottom: 12px;
}
#calculator-app .result-section > div > div:last-child {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}

/* ── 11. Saved reports + empty state ─────────────────────────────────────── */
#calculator-app .saved-reports-section { padding: 26px 28px; }
#calculator-app .saved-reports-header h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.1rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 10px;
}
#calculator-app .saved-reports-list p {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  text-transform: uppercase;
  padding: 24px 0 !important;
  border: 1px dashed var(--border);
  border-radius: 0;
}
#calculator-app .report-item {
  padding: 12px 16px;
  transition: border-color .15s ease, transform .15s ease;
}
#calculator-app .report-item:hover { border-color: var(--primary); transform: translateX(2px); }

/* ── 12. Additional sections (custom material / equipment / labor) ───────── */
#calculator-app .additional-materials-section { padding: 26px; margin-top: 28px; }
#calculator-app .additional-materials-section h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.05rem;
  margin: 0 0 16px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ── 13. Modal polish ────────────────────────────────────────────────────── */
#calculator-app .modal-content { padding: 32px; }
#calculator-app .modal-header h3 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.005em;
}
#calculator-app .save-options { gap: 12px; }
#calculator-app .save-options .btn { min-height: 50px; justify-content: flex-start; padding-left: 20px; }

/* ── 14. User-note (relocated to bottom of non-Project tabs) ─────────────── */
#calculator-app .user-note {
  padding: 20px 22px;
  border-left-width: 4px;
  font-size: 14px;
  line-height: 1.6;
}
#calculator-app .user-note strong i { color: var(--primary); }
#calculator-app .user-note ul { margin: 12px 0 0 0; padding-left: 22px; }
#calculator-app .user-note li { margin-bottom: 6px; }
#calculator-app .user-note.user-note-relocated {
  margin: 32px 0 0 0;
  position: relative;
}
#calculator-app .user-note.user-note-relocated::before {
  content: 'HELP';
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--primary);
  margin-bottom: 8px;
}

/* ── 15. About-guide-section (Project Info only) ─────────────────────────── */
#calculator-app .about-guide-section {
  margin: 40px 0 0 0;
  padding: 36px 40px;
}
#calculator-app .about-guide-section h3 {
  font-family: 'Barlow', sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.005em;
  padding-bottom: 16px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
#calculator-app .about-guide-section h3 i { color: var(--primary); }
#calculator-app .about-guide-section h4 {
  font-family: 'Barlow', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.005em;
  margin: 24px 0 12px 0 !important;
}
#calculator-app .about-guide-section p {
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 14px;
}
#calculator-app .about-guide-section .how-to-list {
  padding-left: 24px;
  margin: 16px 0 20px 0 !important;
}
#calculator-app .about-guide-section .how-to-list li {
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.65;
}
#calculator-app .about-guide-section .perfect-for-line {
  padding: 16px 20px;
  border-left: 3px solid var(--primary);
  background: color-mix(in srgb, var(--primary) 6%, transparent);
  margin-top: 24px !important;
  font-size: 14.5px;
  color: var(--text) !important;
}

/* ── 16. Calculator navigation footer ────────────────────────────────────── */
#calculator-app .calculator-navigation { padding-top: 28px; margin-top: 40px; }
#calculator-app .tab-navigation { gap: 12px; }

/* ── 17. Mobile & tablet responsive polish ───────────────────────────────── */
@media (max-width: 900px) {
  #calculator-app .tab-content { padding: 24px 20px; }
  #calculator-app .tabs-header { padding: 8px 12px; }
  #calculator-app .tabs { padding: 4px 4px 0 4px; }
  #calculator-app .tab { padding: 14px 16px; font-size: 13px; min-height: 48px; }
  #calculator-app .about-guide-section { padding: 24px 20px; }
  #calculator-app .about-guide-section h3 { font-size: 1.25rem; }
  #calculator-app .result-section { padding: 24px; }
  #calculator-app .result-section > div > div:first-child { font-size: 2.4rem; }
  #calculator-app .summary-card .amount { font-size: 1.35rem; }
  #calculator-app .material-summary-total { flex-direction: column; align-items: flex-start; gap: 6px; }
  #calculator-app .material-summary-total .total-amount { font-size: 1.4rem; }
  #calculator-app .calculator-navigation { flex-direction: column; align-items: stretch; gap: 12px; }
  #calculator-app .calculator-navigation > div { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
  #calculator-app .tab-navigation { justify-content: space-between; }
  #calculator-app .calculator-navigation .btn { flex: 1 1 auto; }
}
@media (max-width: 600px) {
  #calculator-app .tab-content { padding: 20px 16px; }
  #calculator-app .tab-content > h2,
  #calculator-app .tab-content > h3 { font-size: 1.35rem; }
  #calculator-app .quantity-item,
  #calculator-app .material-item,
  #calculator-app .labor-category-section { padding: 18px; }
  #calculator-app .form-group input,
  #calculator-app .form-group select { min-height: 44px; font-size: 16px; /* iOS zoom fix */ }
  #calculator-app .custom-area,
  #calculator-app .unit-cost { flex-direction: column; align-items: stretch; gap: 6px; }
  #calculator-app .custom-area label,
  #calculator-app .unit-cost label { min-width: auto; }
  #calculator-app .save-options .btn { justify-content: center; padding-left: 12px; }
  #calculator-app .about-guide-section { padding: 20px 16px; }
  #calculator-app .result-section > div > div:first-child { font-size: 2rem; }
  #calculator-app .modal-content { padding: 24px 20px; }
}

/* ── 18. Reduce motion — respect user preference ─────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  #calculator-app .quantity-item,
  #calculator-app .material-item,
  #calculator-app .summary-card,
  #calculator-app .report-item,
  #calculator-app .btn,
  #calculator-app .tab { transition: none !important; }
  #calculator-app .quantity-item:hover,
  #calculator-app .material-item:hover,
  #calculator-app .summary-card:hover,
  #calculator-app .report-item:hover { transform: none !important; }
}