#flipbook {
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
  border-radius: 10px;
  overflow: hidden;
}

#flipbook-container {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--bg-main);
  padding: 40px 20px;
}

#flipbook-loader {
  width: 100%;
  height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-main);
  color: var(--text-main);
}

.spinner {
  width: 60px;
  height: 60px;
  border: 6px solid var(--border-light);
  border-top: 6px solid var(--red-main);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.download-btn {
  display: inline-block;
  margin: 20px 0;
  padding: 12px 20px;
  background: var(--red-main);
  color: var(--white);
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.download-btn:hover {
  background: var(--red-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(187, 24, 24, 0.3);
}