:root {
  --background-color: #1a1a1a;
  --primary-color: #ffde00;
  --text-color: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.4);
}

body {
  font-family: 'Montserrat', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background-image: radial-gradient(circle, #333, #1a1a1a 70%);
  text-align: center;
}

.container {
  background-color: #2b2b2b;
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0 10px 30px var(--shadow-color);
  text-align: center;
  max-width: 600px;
  width: 90%;
}

header h1 {
  font-size: 3em;
  color: var(--primary-color);
  margin-bottom: 30px;
  text-shadow: 0 4px 10px var(--shadow-color);
}

.lotto-display {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.lotto-ball {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: #000;
  font-size: 2em;
  font-weight: bold;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 5px 15px var(--shadow-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.lotto-ball:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px var(--shadow-color);
}

#generate-btn {
  background-color: var(--primary-color);
  color: #000;
  font-size: 1.5em;
  font-weight: bold;
  padding: 15px 30px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.3s;
  box-shadow: 0 5px 15px var(--shadow-color);
}

#generate-btn:hover {
  background-color: #fff;
  transform: translateY(-3px);
}

@media (max-width: 600px) {
  header h1 {
    font-size: 2em;
  }
  .lotto-ball {
    width: 50px;
    height: 50px;
    font-size: 1.5em;
  }
  #generate-btn {
    font-size: 1.2em;
    padding: 12px 25px;
  }
}