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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: #667eea;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

#root {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  padding: 20px;
}

button {
  font-size: 3rem;
  padding: 20px 40px;
  margin: 10px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}


button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

button:active {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

button:focus {
  outline: 3px solid #667eea;
  outline-offset: 2px;
}

footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 2px solid #e0e0e0;
  font-size: 0.85rem;
  color: #fff;
  line-height: 1.6;
}