* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  color: #222;
  background: #fafafa;
}

header, footer {
  padding: 1.5rem;
  text-align: center;
}

header {
  background: #2c3e50;
  color: white;
}

main {
  max-width: 600px;
  margin: 2rem auto;
  padding: 0 1rem;
  text-align: center;
}

button {
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  border: none;
  border-radius: 6px;
  background: #2c3e50;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #1a252f;
}

.numbers {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.ball {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: #e74c3c;
  color: white;
  font-weight: bold;
  font-size: 1.1rem;
}