/* CSS Variables for Theme Management */
:root {
  /* Light Theme Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --accent-primary: #007bff;
  --accent-secondary: #6c757d;
  --success: #28a745;
  --info: #17a2b8;
  --warning: #ffc107;
  --danger: #dc3545;
  --border-color: #dee2e6;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  
  /* Message Colors */
  --message-user-bg: #007bff;
  --message-user-text: #ffffff;
  --message-assistant-bg: #e9ecef;
  --message-assistant-text: #212529;
  
  /* Animation Variables */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Sizing Variables */
  --border-radius: 0.375rem;
  --border-radius-lg: 0.5rem;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 3rem;
}

/* Dark Theme Colors */
[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #404040;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #808080;
  --accent-primary: #4a9eff;
  --accent-secondary: #6c757d;
  --success: #48c774;
  --info: #3298dc;
  --warning: #ffdd57;
  --danger: #f14668;
  --border-color: #404040;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.4);
  
  --message-user-bg: #4a9eff;
  --message-user-text: #ffffff;
  --message-assistant-bg: #2d2d2d;
  --message-assistant-text: #ffffff;
  
  color-scheme: dark;
}

/* Auto Theme Detection */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    --accent-primary: #4a9eff;
    --accent-secondary: #6c757d;
    --success: #48c774;
    --info: #3298dc;
    --warning: #ffdd57;
    --danger: #f14668;
    --border-color: #404040;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-hover: rgba(0, 0, 0, 0.4);
    
    --message-user-bg: #4a9eff;
    --message-user-text: #ffffff;
    --message-assistant-bg: #2d2d2d;
    --message-assistant-text: #ffffff;
  }
}

/* Base Styles */
* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.container {
  flex: 1 0 auto;
}

footer {
  flex-shrink: 0;
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  transition: background-color var(--transition-normal);
}

/* Navigation Bar */
.navbar {
  background-color: var(--accent-primary) !important;
  box-shadow: 0 2px 4px var(--shadow);
  transition: box-shadow var(--transition-normal);
}

.navbar:hover {
  box-shadow: 0 4px 8px var(--shadow-hover);
}

/* User Avatar in Navigation */
.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.theme-toggle:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--accent-primary);
}

/* Chat Container Styles */
.chat-container {
  height: calc(100vh - 280px);
  min-height: 400px;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 12px var(--shadow);
  transition: all var(--transition-normal);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  scroll-behavior: smooth;
}

/* Message Styles */
.message {
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-lg);
  max-width: 80%;
  position: relative;
  word-wrap: break-word;
  animation: messageSlideIn 0.3s ease-out;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.message:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

.message-user {
  align-self: flex-end;
  background-color: var(--message-user-bg);
  color: var(--message-user-text);
  margin-left: auto;
  border-bottom-right-radius: var(--spacing-xs);
}

.message-assistant {
  align-self: flex-start;
  background-color: var(--message-assistant-bg);
  color: var(--message-assistant-text);
  border-bottom-left-radius: var(--spacing-xs);
  border: 1px solid var(--border-color);
}

/* Message Header */
.message-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--spacing-xs);
  gap: var(--spacing-sm);
}

/* Avatar Styles */
.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  flex-shrink: 0;
}

.avatar-user {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.avatar-assistant {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
}

/* Timestamp Styles */
.message-timestamp {
  font-size: 0.75rem;
  color: var(--text-muted);
  opacity: 0.7;
}

/* Message Animations */
@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Typing Indicator */
.typing-indicator {
  margin-bottom: var(--spacing-md);
}

.typing-dots {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 0;
}

.typing-dots span {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--accent-primary);
  border-radius: 50%;
  animation: typing-pulse 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing-pulse {
  0%, 80%, 100% {
    opacity: 0.3;
    transform: scale(0.8);
  }
  40% {
    opacity: 1;
    transform: scale(1);
  }
}

/* Quick Reply Buttons */
.quick-replies {
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.quick-reply-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.quick-reply-btn:hover {
  background-color: var(--accent-primary);
  color: white;
  transform: translateY(-1px);
}

/* Message Reactions */
.message-reactions {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xs);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

.reaction-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2px 6px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.reaction-btn:hover {
  background-color: var(--bg-tertiary);
  transform: scale(1.1);
}

.reaction-btn.active {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

/* Chat Input */
.chat-input {
  padding: var(--spacing-md);
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.chat-input textarea {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.chat-input textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
  outline: none;
}

.input-help {
  margin-top: var(--spacing-xs);
}

/* Cards */
.card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 2px 8px var(--shadow);
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: 0 4px 16px var(--shadow-hover);
  transform: translateY(-2px);
}

.card-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

/* Buttons */
.btn {
  transition: all var(--transition-fast);
  border-radius: var(--border-radius);
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-outline-primary {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.btn-outline-primary:hover {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* Alerts */
.alert {
  border-radius: var(--border-radius);
  border: none;
  animation: slideInDown 0.3s ease-out;
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* List Groups */
.list-group-item {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border-color: var(--border-color);
  transition: all var(--transition-fast);
}

.list-group-item:hover {
  background-color: var(--bg-secondary);
  transform: translateX(4px);
}

/* Forms */
.form-control {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-color);
  transition: all var(--transition-fast);
}

.form-control:focus {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.form-select {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.form-label {
  color: var(--text-primary);
}

.form-text {
  color: var(--text-secondary);
}

.form-check-label {
  color: var(--text-primary);
}

.form-check-input {
  background-color: var(--bg-secondary);
  border-color: var(--border-color);
}

.form-check-input:checked {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}

/* Dark theme overrides */
[data-theme="dark"] .card-header {
  background-color: var(--bg-tertiary) !important;
  color: var(--text-primary) !important;
  border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3, 
[data-theme="dark"] h4, [data-theme="dark"] h5, [data-theme="dark"] h6 {
  color: var(--text-primary) !important;
}

[data-theme="dark"] .text-muted {
  color: var(--text-secondary) !important;
}

[data-theme="dark"] .alert-info {
  background-color: rgba(58, 149, 220, 0.1) !important;
  border-color: rgba(58, 149, 220, 0.3) !important;
  color: var(--text-primary) !important;
}

[data-theme="dark"] .bg-light {
  background-color: var(--bg-tertiary) !important;
  color: var(--text-primary) !important;
}

[data-theme="dark"] .border-bottom {
  border-color: var(--border-color) !important;
}

/* Auto theme for dark system preference */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .card-header {
    background-color: var(--bg-tertiary) !important;
    color: var(--text-primary) !important;
    border-bottom-color: var(--border-color) !important;
  }

  [data-theme="auto"] h1, [data-theme="auto"] h2, [data-theme="auto"] h3, 
  [data-theme="auto"] h4, [data-theme="auto"] h5, [data-theme="auto"] h6 {
    color: var(--text-primary) !important;
  }

  [data-theme="auto"] .text-muted {
    color: var(--text-secondary) !important;
  }

  [data-theme="auto"] .alert-info {
    background-color: rgba(58, 149, 220, 0.1) !important;
    border-color: rgba(58, 149, 220, 0.3) !important;
    color: var(--text-primary) !important;
  }

  [data-theme="auto"] .bg-light {
    background-color: var(--bg-tertiary) !important;
    color: var(--text-primary) !important;
  }

  [data-theme="auto"] .border-bottom {
    border-color: var(--border-color) !important;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .message {
    max-width: 90%;
  }
  
  .quick-replies {
    padding: var(--spacing-xs);
  }
  
  .quick-reply-btn {
    font-size: 0.75rem;
    padding: 4px 8px;
  }
  
  .chat-container {
    height: calc(100vh - 200px);
  }
}

/* Utility Classes */
.fade-in {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}