frontend/src/App.css

.App {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
  direction: rtl;
  font-family: 'Segoe UI', 'Arial', 'Tahoma', 'Cairo', 'Noto Sans Arabic', sans-serif;
}

.chat-container {
  width: 100%;
  max-width: 900px;
  height: 90vh;
  background: white;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 25px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.chat-header h1 {
  margin: 0 0 10px 0;
  font-size: 28px;
  font-weight: 600;
}

.chat-header p {
  margin: 0 0 15px 0;
  opacity: 0.9;
  font-size: 14px;
}

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: #f8f9fa;
}

.welcome-message {
  text-align: center;
  padding: 60px 20px;
  color: #666;
}

.welcome-message h2 {
  color: #333;
  margin-bottom: 15px;
  font-size: 24px;
}

.welcome-message p {
  margin: 10px 0;
  font-size: 16px;
}

.welcome-message .hint {
  font-size: 14px;
  color: #999;
  font-style: italic;
}

.message {
  margin-bottom: 20px;
  display: flex;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.user {
  justify-content: flex-start;
}

.message.assistant {
  justify-content: flex-start;
}

.message-content {
  max-width: 70%;
  padding: 15px 20px;
  border-radius: 18px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.message.user .message-content {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-bottom-left-radius: 4px;
}

.message.assistant .message-content {
  background: white;
  color: #333;
  border-bottom-right-radius: 4px;
}

.message-header {
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 8px;
  opacity: 0.8;
}

.message-text {
  font-size: 15px;
  line-height: 1.8;
  word-wrap: break-word;
  text-align: right;
  direction: rtl;
}

.message-text.error {
  color: #d32f2f;
}

.message-text p {
  margin: 0 0 10px 0;
}

.message-text strong {
  font-weight: 700;
}

.message-text ul,
.message-text ol {
  padding-right: 20px;
  margin: 10px 0;
}

.message-text li {
  margin-bottom: 6px;
}

.typing-indicator {
  display: inline-block;
}

.typing-indicator::after {
  content: '...';
  animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
  0%, 20% {
    content: '.';
  }
  40% {
    content: '..';
  }
  60%, 100% {
    content: '...';
  }
}

.sources {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  font-size: 12px;
}

.message.user .sources {
  border-top-color: rgba(255, 255, 255, 0.3);
}

.sources strong {
  display: block;
  margin-bottom: 6px;
  opacity: 0.8;
}

.sources ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sources li {
  padding: 4px 0;
  opacity: 0.9;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.source-name {
  font-weight: 600;
  color: #333;
}

.source-actions {
  display: flex;
  gap: 10px;
}

.source-link {
  background: none;
  border: none;
  color: #4c6ef5;
  cursor: pointer;
  text-decoration: underline;
  font-size: 14px;
  font-weight: 600;
  padding: 0;
  direction: rtl;
  text-align: right;
}

.source-link:hover {
  color: #2a48c5;
}

.source-link.download {
  color: #2f9e44;
}

.source-link.download:hover {
  color: #1b6d2f;
}

.preview-panel {
  margin: 20px;
  padding: 15px;
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  background: #fdfdfd;
  max-height: 300px;
  overflow: auto;
  direction: rtl;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.preview-header h3 {
  margin: 0;
}

.preview-filename {
  font-size: 14px;
  color: #555;
}

.close-preview {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: #ff4d4f;
  font-weight: bold;
}

.close-preview:hover {
  color: #d9363e;
}

.preview-content pre {
  white-space: pre-wrap;
  direction: rtl;
  text-align: right;
  margin: 0;
  font-size: 14px;
  background: #f8f9fa;
  padding: 10px;
  border-radius: 8px;
}

.preview-content {
  min-height: 200px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.pdf-frame {
  width: 100%;
  height: 400px;
  border: none;
  border-radius: 8px;
  background: #fff;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.05);
}

.input-container {
  display: flex;
  padding: 20px;
  background: white;
  border-top: 1px solid #e0e0e0;
  gap: 10px;
}

.message-input {
  flex: 1;
  padding: 15px 20px;
  border: 2px solid #e0e0e0;
  border-radius: 25px;
  font-size: 15px;
  outline: none;
  transition: border-color 0.3s ease;
  text-align: right;
  direction: rtl;
}

.message-input:focus {
  border-color: #667eea;
}

.message-input:disabled {
  background: #f5f5f5;
  cursor: not-allowed;
}

.send-button {
  padding: 15px 30px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 25px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.send-button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.send-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Scrollbar styling */
.messages-container::-webkit-scrollbar {
  width: 8px;
}

.messages-container::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 10px;
}

.messages-container::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: 10px;
}

.messages-container::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* Responsive design */
@media (max-width: 768px) {
  .chat-container {
    height: 100vh;
    border-radius: 0;
  }

  .message-content {
    max-width: 85%;
  }

  .chat-header h1 {
    font-size: 24px;
  }
}