:root {
  --color-bg: #f8f9fa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6c757d;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-accent: #10b981;
  --color-border: #e2e8f0;
  --color-error: #dc2626;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);

  /* Granularity badge colors */
  --badge-zip: #10b981;
  --badge-county: #3b82f6;
  --badge-msa: #14b8a6;
  --badge-state: #f97316;
  --badge-region: #f59e0b;
  --badge-national: #9ca3af;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 1rem;
}

/* Header */
.header {
  text-align: center;
  padding: 2rem 0 1rem;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
}

.header .attribution {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* Input Section */
.input-section {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1rem;
}

.zip-form {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

.zip-form .field {
  flex: 1;
}

.zip-form label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: var(--color-text);
}

.zip-form input[type="text"] {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1.125rem;
  letter-spacing: 0.1em;
  transition: border-color 0.15s;
}

.zip-form input[type="text"]:focus {
  outline: none;
  border-color: var(--color-primary);
}

.btn-calculate {
  padding: 0.625rem 1.5rem;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s;
  white-space: nowrap;
}

.btn-calculate:hover {
  background: var(--color-primary-hover);
}

.btn-calculate:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.error-message {
  color: var(--color-error);
  font-size: 0.875rem;
  margin-top: 0.5rem;
  display: none;
}

.error-message.visible {
  display: block;
}

/* Advanced Settings */
.advanced-toggle {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 0.5rem 0;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.advanced-toggle .arrow {
  transition: transform 0.2s;
  font-size: 0.75rem;
}

.advanced-toggle.open .arrow {
  transform: rotate(90deg);
}

.advanced-panel {
  display: none;
  padding-top: 1rem;
}

.advanced-panel.open {
  display: block;
}

.slider-group {
  margin-bottom: 1rem;
}

.slider-group:last-child {
  margin-bottom: 0;
}

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.slider-label span:last-child {
  font-weight: 600;
  color: var(--color-primary);
}

.slider-group input[type="range"] {
  width: 100%;
  accent-color: var(--color-primary);
}

.slider-group input[type="number"] {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9375rem;
}

.slider-group input[type="number"]:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Results */
.results {
  display: none;
}

.results.visible {
  display: block;
}

/* Result Hero */
.result-hero {
  background: linear-gradient(135deg, var(--color-primary), #7c3aed);
  color: white;
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-lg);
}

.result-hero .location {
  font-size: 1rem;
  opacity: 0.9;
  margin-bottom: 0.5rem;
}

.result-hero .wage {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.1;
}

.result-hero .wage-label {
  font-size: 1rem;
  opacity: 0.85;
  margin-top: 0.25rem;
}

.result-hero .gross-summary {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1.25rem;
  font-size: 0.9375rem;
}

.result-hero .gross-summary span {
  opacity: 0.9;
}

.result-hero .gross-summary strong {
  display: block;
  font-size: 1.125rem;
}

/* Enrichment Badge (result hero) */
.enrichment-badge {
  display: none;
  font-size: 0.75rem;
  opacity: 0.9;
  margin-top: 0.5rem;
  padding: 0.25rem 0.75rem;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 999px;
}

.enrichment-badge.visible {
  display: inline-block;
}

/* Live badge indicator (green dot after badge text) */
.badge-live::after {
  content: '';
  display: inline-block;
  width: 0.375rem;
  height: 0.375rem;
  background: #22c55e;
  border-radius: 50%;
  margin-left: 0.375rem;
  vertical-align: middle;
}

/* Pulse animation for updated amounts */
@keyframes pulse-green {
  0% { background-color: rgba(34, 197, 94, 0.2); }
  100% { background-color: transparent; }
}

.amount-updated {
  animation: pulse-green 1.5s ease-out;
}

/* Staleness Warning */
.staleness-warning {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: #fef3c7;
  color: #92400e;
  border-radius: var(--radius);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  border: 1px solid #fde68a;
}

.staleness-warning a {
  color: #92400e;
  font-weight: 600;
}

.staleness-icon {
  font-size: 1.125rem;
  flex-shrink: 0;
}

/* Stale badge for individual sources */
.badge-stale {
  display: inline-block;
  padding: 0.0625rem 0.375rem;
  border-radius: 999px;
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #fde68a;
  margin-left: 0.375rem;
  vertical-align: middle;
}

/* Data generated date */
.data-generated {
  padding: 0.5rem 1.5rem 0;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Breakdown Card */
.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
  overflow: hidden;
}

.card-header {
  padding: 1rem 1.5rem;
  font-weight: 700;
  font-size: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.card-body {
  padding: 0;
}

/* Breakdown Table */
.breakdown-table {
  width: 100%;
  font-size: 0.9375rem;
}

.breakdown-table th {
  text-align: left;
  padding: 0.625rem 1rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  font-weight: 600;
}

.breakdown-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
}

.breakdown-table tr:last-child td {
  border-bottom: none;
}

.breakdown-table .total-row {
  font-weight: 700;
  background: var(--color-bg);
}

.breakdown-table .amount {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Granularity Badge */
.badge {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: 999px;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.badge-zip      { background: var(--badge-zip);      color: white; }
.badge-county   { background: var(--badge-county);   color: white; }
.badge-msa      { background: var(--badge-msa);      color: white; }
.badge-state    { background: var(--badge-state);     color: white; }
.badge-region   { background: var(--badge-region);    color: white; }
.badge-national { background: var(--badge-national);  color: white; }

/* Formula Display */
.formula-display {
  padding: 1.25rem 1.5rem;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875rem;
  color: var(--color-text);
  line-height: 1.8;
}

.formula-display .formula-line {
  margin-bottom: 0.5rem;
}

.formula-display .formula-var {
  color: var(--color-primary);
  font-weight: 600;
}

.formula-display .formula-result {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}

/* Data Sources */
.sources-list {
  list-style: none;
  padding: 1rem 1.5rem;
}

.sources-list li {
  padding: 0.375rem 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
}

.sources-list li .source-name {
  font-weight: 600;
  color: var(--color-text);
}

.sources-list a {
  color: var(--color-primary);
  text-decoration: none;
}

.sources-list a:hover {
  text-decoration: underline;
}

/* Granularity Legend */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem 1rem;
  border-top: 1px solid var(--color-border);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer a {
  color: var(--color-primary);
  text-decoration: none;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

/* Focus Styles */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.zip-form input[type="text"]:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 0;
}

.result-hero:focus {
  outline: none;
}

/* Tooltip Styles */
.component-cell {
  position: relative;
}

.info-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.125rem;
  height: 1.125rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  cursor: help;
  vertical-align: middle;
  margin-left: 0.25rem;
  position: relative;
  border-radius: 50%;
}

.info-icon:hover,
.info-icon:focus {
  color: var(--color-primary);
}

.tooltip {
  display: none;
  position: absolute;
  left: 0;
  bottom: 100%;
  margin-bottom: 0.375rem;
  background: var(--color-text);
  color: white;
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.4;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  white-space: nowrap;
  z-index: 10;
  pointer-events: none;
  box-shadow: var(--shadow);
}

.info-icon:hover .tooltip,
.info-icon:focus .tooltip {
  display: block;
}

/* Methodology Section */
.methodology-toggle {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  color: var(--color-text);
}

.methodology-toggle .arrow {
  transition: transform 0.2s;
  font-size: 0.75rem;
}

.methodology-toggle.open .arrow {
  transform: rotate(90deg);
}

.methodology-panel {
  display: none;
}

.methodology-panel.open {
  display: block;
}

.methodology-body {
  padding: 1.25rem 1.5rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text);
}

.methodology-body h4 {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-top: 1.25rem;
  margin-bottom: 0.375rem;
}

.methodology-body p {
  margin-bottom: 0.625rem;
}

.methodology-body .formula-inline {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  background: var(--color-bg);
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius);
  display: inline-block;
}

.methodology-body ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0.75rem;
}

.methodology-body li {
  padding: 0.125rem 0;
}

.methodology-body li::before {
  content: '\2022';
  color: var(--color-primary);
  font-weight: 700;
  margin-right: 0.5rem;
}

/* Loading state */
.loading .btn-calculate {
  opacity: 0.6;
  cursor: wait;
}

/* Table scroll on mobile */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* Responsive */
@media (max-width: 640px) {
  .container {
    padding: 0.75rem;
  }

  .header h1 {
    font-size: 1.375rem;
  }

  .result-hero .wage {
    font-size: 2.25rem;
  }

  .result-hero .gross-summary {
    flex-direction: column;
    gap: 0.5rem;
  }

  .zip-form {
    flex-direction: column;
  }

  .btn-calculate {
    width: 100%;
    padding: 0.75rem;
  }

  .breakdown-table {
    font-size: 0.8125rem;
  }

  .breakdown-table th,
  .breakdown-table td {
    padding: 0.5rem 0.625rem;
  }
}

/* Print Stylesheet */
@media print {
  .input-section,
  .advanced-toggle,
  .advanced-panel,
  .footer,
  .skip-link,
  .info-icon,
  .enrichment-badge,
  .staleness-warning {
    display: none !important;
  }

  .badge-live::after {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }

  .results {
    display: block !important;
  }

  .result-hero {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
    border: 2px solid #333;
    padding: 1.5rem;
  }

  .result-hero .location,
  .result-hero .wage-label,
  .result-hero .gross-summary span {
    opacity: 1;
    color: black;
  }

  .result-hero .wage {
    color: black;
  }

  .result-hero .gross-summary strong {
    color: black;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  .breakdown-table {
    break-inside: avoid;
  }

  .methodology-panel {
    display: block !important;
  }

  .sources-list a::after {
    content: " (" attr(href) ")";
    font-size: 0.75rem;
    color: #666;
  }
}