frontend/src/App.css

/* 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;
  }
}