body {
  font-family: "Inter", sans-serif;
  background-color: #f3f4f6; /* Light gray background */
  display: flex;
  justify-content: center;
  align-items: flex-start; /* Align to top */
  min-height: 100vh;
  padding: 2rem;
  box-sizing: border-box;
}
.container {
  background-color: #ffffff;
  padding: 2.5rem;
  border-radius: 1rem; /* Rounded corners */
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
    0 4px 6px -2px rgba(0, 0, 0, 0.05);
  max-width: 900px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
#loadingSpinner {
  display: none;
  border: 4px solid #e5e7eb;
  border-top: 4px solid #4f46e5;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
}
.file-input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.file-input-group label {
  font-weight: 600;
  color: #374151;
}
.file-input-group input[type="file"],
.file-input-group input[type="text"],
.file-input-group select {
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  background-color: #f9fafb;
  transition: border-color 0.2s ease-in-out;
}
.file-input-group input[type="file"]:hover,
.file-input-group input[type="text"]:hover,
.file-input-group select:hover {
  border-color: #9ca3af;
}
.file-input-group input[type="file"] {
  cursor: pointer;
}
.btn-primary {
  background-color: #4f46e5;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 0.75rem;
  cursor: pointer;
  transition: background-color 0.2s ease-in-out, transform 0.1s ease-in-out;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
}
.btn-primary:hover {
  background-color: #4338ca;
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(0);
}
.btn-download {
  background-color: #10b981;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease-in-out, transform 0.1s ease-in-out;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
}
.btn-download:hover {
  background-color: #059669;
  transform: translateY(-1px);
}
.btn-download:active {
  transform: translateY(0);
}
.message-box {
  background-color: #fef2f2;
  border: 1px solid #ef4444;
  color: #b91c1c;
  padding: 1rem;
  border-radius: 0.75rem;
  margin-top: 1rem;
  font-size: 0.9rem;
  display: none;
}
.message-box.show {
  display: block;
}
.loading-indicator {
  display: none;
  align-items: center;
  gap: 0.5rem;
  color: #4f46e5;
  font-weight: 500;
}
.loading-indicator.show {
  display: flex;
}
.loading-spinner {
  border: 4px solid #f3f4f6;
  border-top: 4px solid #4f46e5;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
.results-section {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e5e7eb;
}
.results-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1f2937;
  margin-bottom: 1rem;
}
.results-summary p {
  margin-bottom: 0.5rem;
  color: #374151;
}
.content-list-container {
  background-color: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 0.75rem;
  padding: 1rem;
  max-height: 300px;
  overflow-y: auto;
  margin-top: 0.5rem;
  margin-bottom: 1.5rem;
}
.content-list-container pre {
  white-space: pre-wrap;
  word-break: break-all;
  font-family: monospace;
  font-size: 0.875rem;
  color: #4b5563;
}
.content-list-container p {
  color: #6b7280;
  font-style: italic;
}

.missing-item {
  background-color: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
}
.missing-item:last-child {
  margin-bottom: 0;
}
.missing-item strong {
  color: #1f2937;
}
.missing-item span {
  color: #4b5563;
}
.missing-item-line {
  font-family: monospace;
  font-size: 0.875rem;
  color: #4b5563;
  white-space: pre-wrap;
  word-break: break-all;
}
.header-loading-message {
  color: #6b7280;
  font-style: italic;
  padding-left: 0.5rem;
}

@media (max-width: 768px) {
  .container {
    padding: 1.5rem;
  }
  .btn-primary {
    width: 100%;
  }
}