/* Spend Analysis Demo - Custom Styles */
/* Building on Pico CSS with professional procurement consulting brand */

:root {
  /* Professional color palette */
  --primary-navy: #0d1b2a;
  --accent-green: #2ca58d;
  --accent-amber: #f59e0b;
  --neutral-light: #e9ecef;
  --neutral-dark: #33415c;
  --text-primary: var(--primary-navy);
  --text-secondary: var(--neutral-dark);
  --background: #ffffff;
  --background-alt: #f8f9fa;
  
  /* Chart colors */
  --chart-before: var(--accent-amber);
  --chart-after: var(--accent-green);
  --chart-neutral: #6c757d;
  --chart-background: var(--neutral-light);
  
  /* Accessibility improvements */
  --focus-color: var(--accent-green);
  --focus-width: 3px;
}

/* Typography - System font stack for performance */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
}

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-navy);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  z-index: 1000;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
  outline: var(--focus-width) solid var(--focus-color);
  outline-offset: 2px;
}

/* Navigation enhancements */
nav {
  background: var(--background);
  border-bottom: 1px solid var(--neutral-light);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(13, 27, 42, 0.1);
}

nav label input[type="checkbox"] {
  margin-right: 0.5rem;
}

/* Hero section styling */
.hero {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--neutral-dark) 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero h1 {
  color: white;
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Section styling */
.section {
  padding: 4rem 0;
}

.section:nth-child(even) {
  background: var(--background-alt);
}

.thesis-section {
  border-top: 4px solid var(--accent-green);
}

.thesis-header {
  margin-bottom: 3rem;
  text-align: center;
}

.thesis-header h2 {
  color: var(--primary-navy);
  font-size: 2rem;
  margin-bottom: 1rem;
}

/* Card styling */
.card {
  background: var(--background);
  border-radius: 8px;
  padding: 2rem;
  box-shadow: 0 2px 8px rgba(13, 27, 42, 0.1);
  height: 100%;
}

.card h3 {
  color: var(--primary-navy);
  margin-bottom: 1rem;
}

/* KPI cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.kpi-card {
  background: var(--background);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 8px rgba(13, 27, 42, 0.1);
  border-left: 4px solid var(--accent-green);
}

.kpi-value {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 0.5rem;
}

.kpi-label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.kpi-delta {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  background: var(--neutral-light);
}

.kpi-delta.positive {
  background: rgba(44, 165, 141, 0.1);
  color: var(--accent-green);
}

.kpi-delta.negative {
  background: rgba(245, 158, 11, 0.1);
  color: var(--accent-amber);
}

.kpi-delta:before {
  content: '';
  margin-right: 0.25rem;
}

.kpi-delta.positive:before {
  content: '↗';
}

.kpi-delta.negative:before {
  content: '↘';
}

/* Charts styling */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.chart-container {
  background: var(--background);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(13, 27, 42, 0.1);
}

.chart-container h3 {
  color: var(--primary-navy);
  font-size: 1.125rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--neutral-light);
  padding-bottom: 0.5rem;
}

.chart {
  width: 100%;
  height: 300px;
  border-radius: 4px;
}

.chart-description {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* Details grid */
.thesis-details {
  margin-top: 3rem;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.details-grid div {
  background: var(--background);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(13, 27, 42, 0.1);
}

.details-grid h4 {
  color: var(--primary-navy);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-green);
}

.details-grid ul {
  margin: 0;
  padding-left: 1rem;
}

.details-grid li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

/* Call to action section */
.cta-section {
  background: var(--primary-navy);
  color: white;
  text-align: center;
}

.cta-section h2,
.cta-section p {
  color: white;
}

.cta-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

/* Button enhancements */
[role="button"].primary {
  background: var(--accent-green);
  border-color: var(--accent-green);
}

[role="button"].primary:hover {
  background: #228b6b;
  border-color: #228b6b;
}

[role="button"].secondary {
  background: transparent;
  border: 2px solid var(--accent-green);
  color: var(--accent-green);
}

[role="button"].secondary:hover {
  background: var(--accent-green);
  color: white;
}

.cta-section [role="button"].secondary {
  color: white;
  border-color: white;
}

.cta-section [role="button"].secondary:hover {
  background: white;
  color: var(--primary-navy);
}

/* Focus states for accessibility */
button:focus,
[role="button"]:focus,
input:focus,
select:focus {
  outline: var(--focus-width) solid var(--focus-color);
  outline-offset: 2px;
}

input[type="checkbox"]:focus {
  box-shadow: 0 0 0 var(--focus-width) var(--focus-color);
}

/* Loading states */
.chart.loading {
  background: var(--neutral-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.chart.loading:after {
  content: "Loading chart...";
}

/* Responsive design */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
  
  .chart-container {
    padding: 1rem;
  }
  
  .chart {
    height: 250px;
  }
  
  .details-grid {
    grid-template-columns: 1fr;
  }
  
  .kpi-grid {
    grid-template-columns: 1fr;
  }
  
  nav ul {
    flex-wrap: wrap;
  }
  
  nav li {
    margin: 0.25rem;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 2rem 0;
  }
  
  .kpi-value {
    font-size: 2rem;
  }
  
  .chart {
    height: 200px;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --primary-navy: #000000;
    --accent-green: #006600;
    --accent-amber: #cc6600;
    --text-primary: #000000;
    --text-secondary: #333333;
  }
  
  .card,
  .kpi-card,
  .chart-container,
  .details-grid div {
    border: 2px solid var(--text-primary);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print styles */
@media print {
  nav,
  .hero-cta,
  .cta-section {
    display: none;
  }
  
  .section {
    break-inside: avoid;
    page-break-inside: avoid;
  }
  
  .chart-container {
    break-inside: avoid;
  }
}