body {
  font-family: sans-serif;
  background: #f4f8fc;
  padding: 2rem;
  text-align: center;
}

.banner {
  max-width: 100%;
  width: auto;
  height: auto;
  cursor: pointer;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease;
}

.banner:hover {
  transform: scale(1.02);
}

.btn {
  background-color: #1d4ed8;
  color: white;
  border: none;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  border-radius: 6px;
  cursor: pointer;
  margin: 0.5rem;
}

.btn:hover {
  background-color: #2563eb;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal {
  background: white;
  padding: 2rem;
  border-radius: 10px;
  max-width: 90%;
  width: 320px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  text-align: center;
  position: relative;
}

.close-btn {
  background: transparent;
  border: none;
  font-size: 1.2rem;
  position: absolute;
  top: 0.8rem;
  right: 1rem;
  color: #666;
  cursor: pointer;
}

.button-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 1rem;
}

@media (min-width: 400px) {
  .button-group {
    flex-direction: row;
    justify-content: center;
  }
}