/**
 * AI Chat Panel - Styles
 *
 * Design Principles:
 * - CSS Variables: Centralized theme management
 * - Explicit Modes: Light and dark themes treated equally
 * - Mobile-first: Responsive design with breakpoints
 * - Accessibility: Clear contrast, readable font sizes
 *
 * Structure:
 * - Variables (theme-independent, light mode, dark mode)
 * - Layout (panel, header, messages, input)
 * - Responsive (tablet, mobile)
 * - Animations (loading dots, transitions)
 */

/* CSS Variables for theming */
:root {
  /* Common constants (theme-independent) */
  --chat-primary: #007bff;
  --chat-primary-rgb: 0, 123, 255;
  --chat-primary-hover: #0056b3;
  --chat-danger: #dc3545;
  --chat-danger-rgb: 220, 53, 69;
  --chat-danger-hover: #c82333;
  --chat-delete-hover: #f44336;
  --chat-success: #28a745;
  --chat-success-hover: #218838;
  --chat-secondary: #6c757d;

  /* Toggle button - muted gray for both themes */
  --chat-toggle-bg: #6c757d;
  --chat-toggle-bg-rgb: 108, 117, 125;
  --chat-toggle-hover: #5a6268;
}

/* Light mode variables */
body:not(.quarto-dark) {
  /* Backgrounds */
  --chat-bg: white;
  --chat-bg-secondary: #fafafa;
  --chat-bg-header: #f8f9fa;
  --chat-bg-dropdown: #f0f0f0;
  --chat-bg-code: #282c34;
  --chat-bg-input: white;

  /* Borders */
  --chat-border: #e0e0e0;
  --chat-border-light: #ddd;
  --chat-border-lighter: #f0f0f0;

  /* Text */
  --chat-text: #333;
  --chat-text-muted: #666;
  --chat-text-light: #999;
  --chat-text-code: #abb2bf;

  /* Messages */
  --chat-message-assistant-bg: white;

  /* Info/Warning/Error boxes */
  --chat-info-bg: #d1ecf1;
  --chat-info-text: #0c5460;
  --chat-warning-bg: #fff3cd;
  --chat-warning-text: #856404;
  --chat-warning-border: #ffc107;
  --chat-error-bg: #f8d7da;
  --chat-error-text: #721c24;

  /* Hover states */
  --chat-hover-light: #f8f8f8;
  --chat-hover-lighter: #e8e8e8;
  --chat-session-active-light: #e3f2fd;
}

/* Dark mode variables */
.quarto-dark {
  /* Backgrounds */
  --chat-bg: #2b3e50;
  --chat-bg-secondary: #1f2d3a;
  --chat-bg-header: #1f2d3a;
  --chat-bg-dropdown: #3a4f5f;
  --chat-bg-code: #1a252f;
  --chat-bg-input: #1f2d3a;

  /* Borders */
  --chat-border: #3a4f5f;
  --chat-border-light: #3a4f5f;
  --chat-border-lighter: #3a4f5f;

  /* Text */
  --chat-text: #ddd;
  --chat-text-muted: #bbb;
  --chat-text-light: #ccc;
  --chat-text-code: #abb2bf;

  /* Messages */
  --chat-message-assistant-bg: #2b3e50;

  /* Info/Warning/Error boxes */
  --chat-info-bg: #1e3a52;
  --chat-info-text: #a8c5d8;
  --chat-warning-bg: #3a3020;
  --chat-warning-text: #d4c090;
  --chat-warning-border: #c9a050;
  --chat-error-bg: #3a1f1f;
  --chat-error-text: #f8b4b4;

  /* Hover states - overridden for dark mode */
  --chat-hover-light: #3a4f5f;
  --chat-hover-lighter: #4a5f6f;
  --chat-session-active-light: #1e3a52;
}

#chat-panel {
  position: fixed;
  right: 10px;
  top: 70px;
  bottom: 80px;  /* Reserve space for button height + margin */
  width: 500px;
  max-width: 90vw;  /* Don't exceed 90% of screen width */
  background: var(--chat-bg);
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
  transform: translateX(calc(100% + 50px));
  z-index: 1000;
  display: flex;
  flex-direction: column;
  border-radius: 8px 0 0 8px;
}

#chat-panel.open {
  transform: translateX(0);
}

#chat-panel.resizing {
  transition: none;
}

.chat-resize-handle {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 8px;
  cursor: ew-resize;
  background: transparent;
  z-index: 1002;
}

.chat-resize-handle:hover,
.chat-resize-handle:active {
  background: rgba(var(--chat-primary-rgb), 0.1);
}

.chat-toggle-btn {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 1001;
  padding: 12px 20px;
  background: var(--chat-toggle-bg);
  color: white;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  font-size: 0.95rem;
  box-shadow: 0 4px 12px rgba(var(--chat-toggle-bg-rgb), 0.3);
  transition: all 0.2s;
}

.chat-toggle-btn:hover {
  background: var(--chat-toggle-hover);
  box-shadow: 0 6px 16px rgba(var(--chat-toggle-bg-rgb), 0.4);
  transform: translateY(-2px);
}

.chat-toggle-btn.open {
  background: var(--chat-toggle-hover);
}

.chat-toggle-btn.open:hover {
  background: var(--chat-toggle-bg);
}

.chat-header {
  padding: 15px;
  border-bottom: 1px solid var(--chat-border);
  background: var(--chat-bg-header);
  border-radius: 8px 0 0 0;
}

.chat-header-top {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
}

.chat-icon {
  font-size: 1.2rem;
}

.chat-session-dropdown-btn {
  background: var(--chat-bg-dropdown);
  border: 1px solid var(--chat-border-light);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.8rem;
  color: var(--chat-text);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px;
  transition: background 0.2s;
}

.chat-session-dropdown-btn:hover {
  background: var(--chat-hover-lighter);
}

.chat-session-dropdown {
  position: absolute;
  top: 60px;
  left: 0;
  right: 0;
  margin: 0 15px;
  background: var(--chat-bg);
  border: 1px solid var(--chat-border-light);
  border-radius: 4px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
  max-height: 350px;
  display: flex;
  flex-direction: column;
  z-index: 1001;
}

.chat-session-list {
  flex: 1;
  overflow-y: auto;
  max-height: 300px;
}

.chat-session-dropdown.hidden {
  display: none;
}

.chat-session-item {
  display: flex;
  align-items: center;
  padding: 8px;
  border-bottom: 1px solid var(--chat-border-lighter);
  cursor: pointer;
  transition: background 0.2s;
}

.chat-session-item:hover {
  background: var(--chat-hover-light);
}

.chat-session-item.active {
  background: var(--chat-session-active-light);
}

.chat-session-info {
  flex: 1;
  min-width: 0;
}

.chat-session-date {
  font-size: 0.7rem;
  color: var(--chat-text-light);
}

.chat-session-title {
  font-size: 0.85rem;
  color: var(--chat-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-session-page {
  font-size: 0.7rem;
  color: var(--chat-text-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}

.chat-session-delete {
  background: none;
  border: none;
  color: var(--chat-text-light);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0 4px;
  margin-left: 8px;
  transition: color 0.2s;
}

.chat-session-delete:hover {
  color: var(--chat-delete-hover);
}

.chat-session-delete-all-wrapper {
  padding: 8px;
  border-top: 1px solid var(--chat-border-light);
  background: var(--chat-bg-secondary);
}

.chat-session-delete-all-btn {
  width: 100%;
  padding: 6px 12px;
  background: transparent;
  color: var(--chat-text-muted);
  border: 1px solid var(--chat-border-light);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s;
}

.chat-session-delete-all-btn:hover {
  background: var(--chat-hover-light);
  color: var(--chat-danger);
  border-color: var(--chat-danger);
}

.chat-current-model {
  font-size: 0.75rem;
  color: var(--chat-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 200px;
  margin-right: auto;
}

.chat-settings:not(.hidden) {
  margin-top: 10px;
}

.chat-header-buttons {
  display: flex;
  gap: 4px;
}

.chat-new-btn,
.chat-export-btn,
.chat-settings-toggle {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s;
  color: var(--chat-text);
}

.chat-new-btn:hover,
.chat-export-btn:hover,
.chat-settings-toggle:hover {
  background: var(--chat-hover-light);
}

.chat-settings {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chat-settings.hidden {
  display: none;
}

.chat-settings label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--chat-text-muted);
}

.chat-settings select,
.chat-settings input {
  padding: 6px;
  border: 1px solid var(--chat-border-light);
  border-radius: 4px;
  font-size: 0.85rem;
  background: var(--chat-bg-input);
  color: var(--chat-text);
}

.chat-settings-buttons {
  display: flex;
  gap: 8px;
}

.chat-settings-save,
.chat-settings-remove {
  flex: 1;
  padding: 6px 12px;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s;
}

.chat-settings-save {
  background: var(--chat-success);
}

.chat-settings-save:hover {
  background: var(--chat-success-hover);
}

.chat-settings-save:disabled {
  background: var(--chat-secondary);
  cursor: not-allowed;
}

.chat-settings-remove {
  background: var(--chat-danger);
}

.chat-settings-remove:hover {
  background: var(--chat-danger-hover);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 15px;
  background: var(--chat-bg-secondary);
}

.chat-message {
  margin-bottom: 15px;
}

.chat-message.user {
  text-align: right;
}

.chat-message-content {
  display: inline-block;
  max-width: 85%;
  padding: 10px 12px;
  border-radius: 8px;
  text-align: left;
  font-size: 0.9rem;
  line-height: 1.5;
}

.chat-message.user .chat-message-content {
  background: var(--chat-primary);
  color: white;
}

.chat-message.assistant .chat-message-content {
  background: var(--chat-message-assistant-bg);
  color: var(--chat-text);
  border: 1px solid var(--chat-border);
}

.chat-message-content pre {
  background: var(--chat-bg-code);
  color: var(--chat-text-code);
  padding: 8px;
  border-radius: 4px;
  overflow-x: auto;
  margin: 8px 0;
  font-size: 0.85rem;
}

.chat-message-content code {
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
}

.chat-message-content p {
  margin: 6px 0;
}

.chat-message-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 12px 0;
  font-size: 0.85rem;
  overflow-x: auto;
  display: block;
}

.chat-message-content th,
.chat-message-content td {
  padding: 8px 12px;
  border: 1px solid var(--chat-border-light);
  text-align: left;
}

.chat-message-content th {
  font-weight: 600;
  color: var(--chat-text);
  background: var(--chat-bg-secondary);
}

.chat-message-content td {
  color: var(--chat-text);
}

.chat-message-content tbody tr:hover {
  background: var(--chat-hover-light);
}

/* KaTeX math rendering */
.chat-message-content .katex-display {
  overflow-x: auto;
}

.chat-input-area {
  padding: 12px;
  border-top: 1px solid var(--chat-border);
  background: var(--chat-bg);
}

.chat-input-group {
  display: flex;
  gap: 8px;
}

.chat-input-group input,
.chat-input-group textarea {
  flex: 1;
  padding: 8px;
  border: 1px solid var(--chat-border-light);
  border-radius: 4px;
  font-size: 0.9rem;
  font-family: inherit;
  background: var(--chat-bg-input);
  color: var(--chat-text);
}

.chat-input-group textarea {
  resize: vertical;
  min-height: 38px;
  max-height: 150px;
  line-height: 1.4;
}

.chat-input-group button {
  padding: 8px 16px;
  background: var(--chat-primary);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
}

.chat-input-group button:hover {
  background: var(--chat-primary-hover);
}

.chat-input-group button:disabled {
  background: var(--chat-secondary);
  cursor: not-allowed;
}

.chat-loading-dots::after {
  content: '...';
  display: inline-block;
  width: 1.5em;
  animation: loading-dots 1.4s steps(3, end) infinite;
}

@keyframes loading-dots {
  0% { content: '.  '; }
  33% { content: '.. '; }
  66% { content: '...'; }
}

.chat-error {
  background: var(--chat-error-bg);
  color: var(--chat-error-text);
  padding: 10px;
  border-radius: 4px;
  margin: 10px 0;
  font-size: 0.85rem;
}

.chat-info {
  background: var(--chat-info-bg);
  color: var(--chat-info-text);
  padding: 10px;
  border-radius: 4px;
  margin: 12px 0;
  text-align: left;
  font-size: 0.85rem;
}

.chat-resize-hint {
  background: var(--chat-warning-bg);
  color: var(--chat-warning-text);
  padding: 8px 10px;
  border-radius: 4px;
  margin: 8px 0;
  text-align: left;
  font-size: 0.8rem;
  border-left: 3px solid var(--chat-warning-border);
}

.chat-setup-wrapper {
  text-align: center;
  padding: 20px 15px;
  color: var(--chat-text-muted);
  background: var(--chat-bg-secondary);
}

.chat-setup-wrapper.hidden {
  display: none;
}

.chat-setup-text {
  font-size: 0.9rem;
  margin: 10px 0;
}

.chat-setup-text a {
  color: var(--chat-primary);
  text-decoration: none;
  font-weight: 500;
}

.chat-setup-text a:hover {
  text-decoration: underline;
}

/* Tablet responsive */
@media (max-width: 1024px) {
  #chat-panel {
    width: 450px;
  }
}

/* Mobile responsive */
@media (max-width: 768px) {
  #chat-panel {
    right: -100%;
    width: calc(100vw - 20px);
    max-width: none;
    top: 60px;
    bottom: 70px;  /* Reserve space above button on mobile too */
  }

  #chat-panel.open {
    right: 10px;
  }

  .chat-toggle-btn {
    padding: 10px 16px;
    font-size: 0.9rem;
  }
}

/* Dark mode support (synced with Quarto dark theme) */
/* Most colors are now handled by CSS variables defined at the top */

.quarto-dark #chat-panel {
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.5);
}