src/index.css

:root {
  --primary: #667eea;
  --secondary: #764ba2;
  --success: #48bb78;
  --error: #f56565;
  --warning: #ed8936;
  --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;
  --border-radius: 8px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
  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, var(--primary) 0%, var(--secondary) 100%);
  min-height: 100vh;
  color: var(--gray-900);
  line-height: 1.6;
}

html, body, #root {
  height: 100%;
}

button {
  cursor: pointer;
  border: none;
  padding: 10px 16px;
  border-radius: var(--border-radius);
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

input, textarea {
  border: 1px solid var(--gray-300);
  padding: 10px 12px;
  border-radius: var(--border-radius);
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.2s ease;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}