Create App.css

frontend/src/App.css

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+/* frontend/src/App.css */
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 20px;
+}
+
+.container {
+  width: 100%;
+  max-width: 600px;
+  margin: 0 auto;
+}
+
+.card {
+  background: white;
+  border-radius: 20px;
+  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
+  padding: 40px;
+  animation: slideUp 0.5s ease;
+}
+
+@keyframes slideUp {
+  from {
+    opacity: 0;
+    transform: translateY(30px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+.header {
+  text-align: center;
+  margin-bottom: 30px;
+}
+
+.header h1 {
+  color: #333;
+  font-size: 2rem;
+  margin-bottom: 10px;
+}
+
+.header p {
+  color: #666;
+  font-size: 1rem;
+}
+
+.form {
+  margin-bottom: 20px;
+}
+
+.input-group {
+  margin-bottom: 20px;
+}
+
+.input-group label {
+  display: block;
+  color: #333;
+  font-weight: 600;
+  margin-bottom: 8px;
+  font-size: 0.95rem;
+}
+
+.input {
+  width: 100%;
+  padding: 12px 16px;
+  border: 2px solid #e1e8ed;
+  border-radius: 10px;
+  font-size: 1rem;
+  transition: all 0.3s ease;
+  font-family: monospace;
+}
+
+.input:focus {
+  outline: none;
+  border-color: #667eea;
+  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
+}
+
+.input:disabled {
+  background: #f5f5f5;
+  cursor: not-allowed;
+}
+
+.input-group small {
+  display: block;
+  color: #999;
+  font-size: 0.85rem;
+  margin-top: 5px;
+}
+
+.button {
+  width: 100%;
+  padding: 14px 24px;
+  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  color: white;
+  border: none;
+  border-radius: 10px;
+  font-size: 1rem;
+  font-weight: 600;
+  cursor: pointer;
+  transition: all 0.3s ease;
+  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
+}
+
+.button:hover:not(:disabled) {
+  transform: translateY(-2px);
+  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
+}
+
+.button:active:not(:disabled) {
+  transform: translateY(0);
+}
+
+.button:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+.button.loading {
+  position: relative;
+  color: transparent;
+}
+
+.button.loading::after {
+  content: '';
+  position: absolute;
+  width: 20px;
+  height: 20px;
+  top: 50%;
+  left: 50%;
+  margin-left: -10px;
+  margin-top: -10px;
+  border: 3px solid white;
+  border-radius: 50%;
+  border-top-color: transparent;
+  animation: spin 0.8s linear infinite;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}
+
+.pairing-code {
+  background: #f8f9fa;
+  border-radius: 12px;
+  padding: 20px;
+  margin-bottom: 20px;
+  animation: fadeIn 0.5s ease;
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+
+.pairing-code h3 {
+  color: #333;
+  margin-bottom: 15px;
+  font-size: 1.1rem;
+}
+
+.code-display {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin-bottom: 15px;
+}
+
+.code {
+  flex: 1;
+  background: white;
+  padding: 15px 20px;
+  border-radius: 8px;
+  font-family: 'Courier New', monospace;
+  font-size: 1.8rem;
+  font-weight: bold;
+  color: #667eea;
+  text-align: center;
+  letter-spacing: 3px;
+  border: 2px dashed #667eea;
+}
+
+.copy-btn {
+  background: #667eea;
+  color: white;
+  border: none;
+  border-radius: 8px;
+  padding: 12px 16px;
+  font-size: 1.2rem;
+  cursor: pointer;
+  transition: all 0.3s ease;
+}
+
+.copy-btn:hover {
+  background: #5568d3;
+  transform: scale(1.1);
+}
+
+.instructions {
+  background: white;
+  padding: 15px;
+  border-radius: 8px;
+  border-left: 4px solid #667eea;
+}
+
+.instructions p {
+  color: #333;
+  font-weight: 600;
+  margin-bottom: 10px;
+}
+
+.instructions ol {
+  margin-left: 20px;
+  color: #666;
+}
+
+.instructions li {
+  margin-bottom: 8px;
+  line-height: 1.5;
+}
+
+.status {
+  padding: 12px 16px;
+  border-radius: 8px;
+  margin-bottom: 20px;
+  font-weight: 500;
+  animation: fadeIn 0.3s ease;
+}
+
+.status.success {
+  background: #d4edda;
+  color: #155724;
+  border: 1px solid #c3e6cb;
+}
+
+.status.error {
+  background: #f8d7da;
+  color: #721c24;
+  border: 1px solid #f5c6cb;
+}
+
+.logs {
+  background: #f8f9fa;
+  border-radius: 12px;
+  padding: 20px;
+  margin-top: 20px;
+}
+
+.logs h3 {
+  color: #333;
+  margin-bottom: 15px;
+  font-size: 1.1rem;
+}
+
+.log-container {
+  max-height: 300px;
+  overflow-y: auto;
+  background: white;
+  border-radius: 8px;
+  padding: 10px;
+}
+
+.log-entry {
+  padding: 8px 12px;
+  margin-bottom: 5px;
+  border-radius: 6px;
+  font-size: 0.9rem;
+  display: flex;
+  gap: 10px;
+  animation: slideIn 0.3s ease;
+}
+
+@keyframes slideIn {
+  from {
+    opacity: 0;
+    transform: translateX(-10px);
+  }
+  to {
+    opacity: 1;
+    transform: translateX(0);
+  }
+}
+
+.log-entry.info {
+  background: #e7f3ff;
+  border-left: 3px solid #2196f3;
+}
+
+.log-entry.success {
+  background: #e8f5e9;
+  border-left: 3px solid #4caf50;
+}
+
+.log-entry.error {
+  background: #ffebee;
+  border-left: 3px solid #f44336;
+}
+
+.log-time {
+  color: #999;
+  font-size: 0.85rem;
+  font-family: monospace;
+  min-width: 80px;
+}
+
+.log-message {
+  color: #333;
+  flex: 1;
+}
+
+.footer {
+  text-align: center;
+  margin-top: 30px;
+  padding-top: 20px;
+  border-top: 1px solid #e1e8ed;
+}
+
+.footer p {
+  color: #999;
+  font-size: 0.85rem;
+  margin-bottom: 5px;
+}
+
+/* Scrollbar styling */
+.log-container::-webkit-scrollbar {
+  width: 8px;
+}
+
+.log-container::-webkit-scrollbar-track {
+  background: #f1f1f1;
+  border-radius: 4px;
+}
+
+.log-container::-webkit-scrollbar-thumb {
+  background: #667eea;
+  border-radius: 4px;
+}
+
+.log-container::-webkit-scrollbar-thumb:hover {
+  background: #5568d3;
+}
+
+/* Responsive */
+@media (max-width: 640px) {
+  .card {
+    padding: 25px;
+  }
+  
+  .header h1 {
+    font-size: 1.5rem;
+  }
+  
+  .code {
+    font-size: 1.4rem;
+    letter-spacing: 2px;
+  }
+}