:root {
  --background-color: #1a1a1a;
  --app-background-color: #2c2c2c;
  --primary-color: #e53e3e;
  --primary-hover-color: #c53030;
  --text-color: #ffffff;
  --number-bg-color: #e53e3e;
  --number-text-color: #ffffff;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  position: relative;
}

body::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAyCAYAAAAeP4ixAAAANklEQVRoQ+3AEQEAIAgAsMF/d/gpDRgKAwECgYBAICCQCAgEAoGAQEAgEBAICIRAOxJ3/4cAC/gL+QAAAABJRU5ErkJggg==');
  opacity: 0.05;
  z-index: -1;
}

main {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

#app {
  background-color: var(--app-background-color);
  padding: 40px;
  border-radius: 12px;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  text-align: center;
}

h1 {
  margin-top: 0;
  font-size: 2rem;
  color: var(--primary-color);
}

#generate-btn {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 15px 30px;
  font-size: 1rem;
  font-weight: bold;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s, box-shadow 0.3s;
  margin-top: 20px;
  box-shadow: 0 4px 6px rgba(79, 70, 229, 0.2);
}

#generate-btn:hover {
  background-color: var(--primary-hover-color);
  box-shadow: 0 7px 14px rgba(79, 70, 229, 0.3);
}

#numbers-display {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  margin-top: 30px;
  min-height: 60px;
}

.number-circle {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--number-bg-color);
  color: var(--number-text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
  font-weight: bold;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

@media (max-width: 480px) {
  #app {
    padding: 20px;
  }

  h1 {
    font-size: 1.5rem;
  }

  #generate-btn {
    padding: 12px 24px;
  }

  .number-circle {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
  }
}