/**
 * Chat Application Styles - MVC with CRUD
 * Clean, modern design with focus on usability
 */

/* CSS Variables for easy theming */
:root {
  --primary-color: #4a90e2;
  --primary-hover: #357abd;
  --secondary-color: #6c757d;
  --secondary-hover: #5a6268;
  --danger-color: #dc3545;
  --danger-hover: #c82333;
  --success-color: #28a745;
  --user-message-bg: #4a90e2;
  --bot-message-bg: #e9ecef;
  --text-dark: #333;
  --text-light: #6c757d;
  --border-color: #dee2e6;
  --bg-light: #f8f9fa;
  --white: #ffffff;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --border-radius: 8px;
  --border-radius-sm: 4px;
  --transition: all 0.3s ease;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-dark);
  background: linear-gradient(135deg, #4a90e2 0%, #2e5c8a 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-lg);
}

/* Chat Application Container */
.chat-app {
  max-width: 800px;
  width: 100%;
  height: 80vh;
  margin: 0 auto;
  background: var(--white);
  border-radius: var(--border-radius);
  box-shadow: 0 10px 40px var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
.chat-header {
  background: linear-gradient(135deg, var(--primary-color), #357abd);
  color: var(--white);
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-content h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.subtitle {
  font-size: 0.875rem;
  opacity: 0.9;
}

.chat-info {
  font-size: 0.875rem;
  background: rgba(255, 255, 255, 0.2);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-sm);
}

/* Chat Controls */
.chat-controls {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--bg-light);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  align-items: center;
}

/* AI Service Selector */
.ai-selector-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-right: auto;
}

.ai-selector-label {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-dark);
}

.ai-selector {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-family: inherit;
  background: var(--white);
  cursor: pointer;
  transition: var(--transition);
  min-width: 200px;
}

.ai-selector:hover {
  border-color: var(--primary-color);
}

.ai-selector:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

/* Messages Container */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  background: var(--white);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

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

.messages::-webkit-scrollbar-track {
  background: var(--bg-light);
}

.messages::-webkit-scrollbar-thumb {
  background: var(--secondary-color);
  border-radius: var(--border-radius-sm);
}

.messages::-webkit-scrollbar-thumb:hover {
  background: var(--secondary-hover);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-light);
  font-style: italic;
}

/* Message Styles */
.message {
  display: flex;
  margin-bottom: var(--spacing-md);
  animation: slideIn 0.3s ease;
}

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

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

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

.message-content {
  max-width: 70%;
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  position: relative;
}

.message.user .message-content {
  background: var(--user-message-bg);
  color: var(--white);
  border-bottom-right-radius: var(--spacing-xs);
}

.message.bot .message-content {
  background: var(--bot-message-bg);
  color: var(--text-dark);
  border-bottom-left-radius: var(--spacing-xs);
}

.message-text {
  margin: 0;
  word-wrap: break-word;
}

/* Edited Indicator */
.edited-indicator {
  display: block;
  font-size: 0.75rem;
  margin-top: var(--spacing-xs);
  opacity: 0.7;
  font-style: italic;
}

/* Message Actions */
.message-actions {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
  opacity: 0;
  transition: var(--transition);
}

.message:hover .message-actions {
  opacity: 1;
}

.btn-edit,
.btn-delete {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  border: none;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
}

.btn-edit {
  background: rgba(255, 255, 255, 0.9);
  color: var(--primary-color);
}

.btn-edit:hover {
  background: var(--white);
  transform: translateY(-1px);
}

.btn-delete {
  background: rgba(255, 255, 255, 0.9);
  color: var(--danger-color);
}

.btn-delete:hover {
  background: var(--danger-color);
  color: var(--white);
  transform: translateY(-1px);
}

/* Input Area */
.input-area {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  background: var(--bg-light);
  border-top: 1px solid var(--border-color);
}

#messageInput {
  flex: 1;
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition);
}

#messageInput:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

/* Buttons */
.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--primary-color);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--secondary-color);
  color: var(--white);
}

.btn-secondary:hover {
  background: var(--secondary-hover);
}

.btn-danger {
  background: var(--danger-color);
  color: var(--white);
}

.btn-danger:hover {
  background: var(--danger-hover);
}

.btn-icon {
  font-size: 1rem;
}

/* Footer */
.app-footer {
  max-width: 800px;
  width: 100%;
  margin: var(--spacing-lg) auto 0;
  padding: var(--spacing-md);
  text-align: center;
  color: var(--white);
  font-size: 0.875rem;
  line-height: 1.6;
}

.app-footer p {
  margin-bottom: var(--spacing-sm);
}

.architecture-note {
  opacity: 0.9;
}

/* Responsive Design */
@media (max-width: 768px) {
  body {
    padding: var(--spacing-sm);
  }

  .chat-app {
    height: 90vh;
  }

  .chat-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .chat-controls {
    flex-direction: column;
  }

  .chat-controls .btn {
    width: 100%;
    justify-content: center;
  }

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

  .app-footer {
    font-size: 0.75rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* Focus Visible for Keyboard Navigation */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Loading Indicator - NEW FOR LAB 8 */
.loading-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Error Toast - NEW FOR LAB 8 */
.error-toast {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  background: var(--danger-color);
  color: var(--white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  opacity: 0;
  transform: translateX(100%);
  transition: all 0.3s ease;
  z-index: 9998;
  max-width: 400px;
}

.error-toast.show {
  opacity: 1;
  transform: translateX(0);
}

/* AI Badge - NEW FOR LAB 8 LLM */
.ai-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
}

.ai-badge:hover {
  background: rgba(255, 255, 255, 0.3);
}

.ai-name {
  font-weight: 600;
}

.ai-type {
  opacity: 0.8;
  font-size: 0.7rem;
}

/* Print Styles */
@media print {
  body {
    background: var(--white);
  }

  .chat-app {
    box-shadow: none;
    height: auto;
  }

  .chat-controls,
  .input-area,
  .message-actions,
  .app-footer {
    display: none;
  }

  .messages {
    overflow: visible;
  }

  .loading-indicator,
  .error-toast {
    display: none;
  }
}