/* ===================================
   Apiction Chat Application
   Professional Theme - Light Mode
   =================================== */

/* CSS Custom Properties */
:root {
  /* Neutral Colors - Clean & Professional */
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-300: #d4d4d4;
  --color-neutral-400: #a3a3a3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;
  --color-neutral-950: #0a0a0a;
  
  /* Accent Color - Subtle Blue */
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-accent-muted: rgba(59, 130, 246, 0.17);
  
  /* Semantic Colors */
  --color-success: #22c55e;
  --color-warning: #eab308;
  --color-error: #ef4444;
  
  /* Light Theme Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f5f5f5;
  --bg-elevated: #ffffff;
  --bg-settings: #393939;
  --bg-overlay: rgba(0, 0, 0, 0.5);
  
  --text-primary: #171717;
  --text-secondary: #525252;
  --text-tertiary: #737373;
  --text-muted: #a3a3a3;
  --text-inverse: #fafafa;
  --settings-label: #a6a6a6;
  
  --border-primary: #b6b4b5;
  --border-secondary: #d4d4d4;
  --border-focus: var(--color-accent);
  
  /* Message Colors */
  --bg-user-message: #f5f5f5;
  --border-message: #e5e5e5;
  
  /* Code Block */
  --bg-code: #1e1e1e;
  --text-code: #d4d4d4;
  
  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.06), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-overlay: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;
  
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  
  --text-xs: 0.8rem;
  --text-sm: 0.9rem;
  --text-base: 0.95rem;
  --text-lg: 1rem;
  --text-xl: 1.125rem;
  
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  
  /* Transitions */
  --transition-fast: 100ms ease;
  --transition-base: 150ms ease;
  --transition-slow: 250ms ease;
  
  /* Layout */
  --app-max-width: 900px;
  --settings-panel-height: auto;
  --header-height: 44px;
  
  /* Z-index */
  --z-base: 0;
  --z-dropdown: 50;
  --z-sticky: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-toast: 400;
}

/* ===================================
   Reset & Base
   =================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* Focus Styles */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent);
  color: var(--text-inverse);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  z-index: var(--z-modal);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

/* ===================================
   App Header (Info/FAQ Panel)
   =================================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  max-width: var(--app-max-width);
  margin: 0 auto;
  background-color: var(--bg-primary);
  border-left: 1px solid var(--border-primary);
  border-right: 1px solid var(--border-primary);
}

.app-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 44px;
  padding: 0 var(--space-4);
  background-color: var(--bg-secondary);
}

.app-header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  color: #676767;
  font-weight: 700;
  font-size: 1rem;
}

.app-header-logo {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.app-header-title::first-letter {
  color: orangered;
}

.app-header-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: var(--radius-md);
  background-color: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.app-header-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.app-header-toggle .icon-close {
  display: none;
}

.app-header-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.app-header-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

.app-header-content {
  display: none;
  max-height: 60vh;
  overflow-y: auto;
  border-top: 1px solid var(--border-secondary);
  background-color: var(--bg-primary);
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.app-header-content::-webkit-scrollbar {
  width: 6px;
}

.app-header-content::-webkit-scrollbar-track {
  background: transparent;
}

.app-header-content::-webkit-scrollbar-thumb {
  background-color: var(--border-primary);
  border-radius: 3px;
}

.app-header-content::-webkit-scrollbar-thumb:hover {
  background-color: var(--border-secondary);
}

.app-header-content[aria-hidden="false"] {
  display: block;
}

.info-card {
  padding: var(--space-6);
  max-width: 720px;
  margin: 0 auto;
}

.info-title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.info-subtitle {
  margin: 0 0 var(--space-6);
  font-size: var(--text-base);
  color: var(--text-secondary);
}

.info-section {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--border-secondary);
}

.info-section:last-of-type {
  border-bottom: none;
}

.info-section h3 {
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
}

.info-section p {
  margin: 0 0 var(--space-3);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.info-section p:last-child {
  margin-bottom: 0;
}

.info-link {
  display: inline-block;
  color: var(--color-accent);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
}

.info-link:hover {
  text-decoration: underline;
}

.info-list {
  margin: 0;
  padding-left: var(--space-5);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.info-list li {
  margin-bottom: var(--space-2);
}

.info-list li:last-child {
  margin-bottom: 0;
}

.info-list code,
.info-section code,
.info-dl code {
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--text-primary);
}

.info-dl {
  margin: 0;
  font-size: var(--text-sm);
}

.info-dl dt {
  margin-top: var(--space-4);
  font-weight: 600;
  color: var(--text-primary);
}

.info-dl dt:first-child {
  margin-top: 0;
}

.info-dl dd {
  margin: var(--space-2) 0 0 0;
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.info-footer {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-secondary);
  text-align: center;
}

.info-footer p {
  margin: 0 0 var(--space-1);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.info-footer p:last-child {
  margin-bottom: 0;
}

.info-footer a {
  color: var(--color-accent);
  text-decoration: none;
}

.info-footer a:hover {
  text-decoration: underline;
}

/* ===================================
   App Container
   =================================== */
.app-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 44px); /* Account for header bar height */
  max-width: var(--app-max-width);
  margin: 0 auto;
  background-color: var(--bg-primary);
  border-left: 1px solid var(--border-primary);
  border-right: 1px solid var(--border-primary);
}

/* ===================================
   Tab Bar
   =================================== */
.tab-bar {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: var(--header-height);
  padding: 0 var(--space-3);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  overflow-x: auto;
  flex-shrink: 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.tab-bar::-webkit-scrollbar {
  height: 0;
}

.tab-list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border-secondary) transparent;
  padding-bottom: 4px;
}

.tab-list::-webkit-scrollbar {
  height: 6px;
}

.tab-list::-webkit-scrollbar-track {
  background: transparent;
}

.tab-list::-webkit-scrollbar-thumb {
  background-color: var(--border-secondary);
  border-radius: 3px;
}

.tab-list::-webkit-scrollbar-thumb:hover {
  background-color: var(--border-primary);
}

.tab-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 32px;
  padding: 0 var(--space-3);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  max-width: 180px;
  min-width: 100px;
  flex-shrink: 0;
}

.tab-item:hover {
  background-color: var(--bg-tertiary);
}

.tab-item.active,
.tab-item[aria-selected="true"] {
  background-color: var(--bg-primary);
  border-color: var(--border-primary);
  box-shadow: var(--shadow-xs);
}

.tab-name {
  flex: 1;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 0;
  min-width: 0;
}

.tab-item.active .tab-name,
.tab-item[aria-selected="true"] .tab-name {
  color: var(--text-primary);
}

.tab-name:focus {
  outline: none;
}

.tab-name[contenteditable="true"] {
  cursor: text;
  background-color: var(--bg-secondary);
  padding: 2px 4px;
  border-radius: var(--radius-sm);
  margin: -2px -4px;
}

.tab-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.tab-item:hover .tab-close,
.tab-item.active .tab-close {
  opacity: 1;
}

.tab-close:hover {
  background-color: var(--color-error);
  color: var(--text-inverse);
}

.tab-add {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  background-color: transparent;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.tab-add:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-secondary);
}

/* ===================================
   Tab Panels
   =================================== */
.tab-panels {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

.tab-panel {
  display: none;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

.tab-panel.active,
.tab-panel[aria-hidden="false"] {
  display: flex;
}

/* ===================================
   Settings Toolbar (persistent slim bar)
   =================================== */
.settings-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-3);
  height: 44px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-primary);
  flex-shrink: 0;
}

/* Theme toggle button icon visibility */
[data-action="toggle-theme"] .theme-icon-moon { display: inline-flex; }
[data-action="toggle-theme"] .theme-icon-sun { display: none; }
[data-action="toggle-theme"][data-theme-active="dark"] .theme-icon-moon { display: none; }
[data-action="toggle-theme"][data-theme-active="dark"] .theme-icon-sun { display: inline-flex; }

.settings-gear-btn {
  position: relative;
}

.settings-gear-btn.has-missing-fields::after {
  content: '';
  position: absolute;
  top: 4px;
  right: 4px;
  width: 6px;
  height: 6px;
  background-color: var(--color-error);
  border-radius: 50%;
  border: 1px solid var(--bg-primary);
}

/* ===================================
   Settings Modal Overlay
   =================================== */
.settings-modal-overlay {
  position: absolute;
  inset: 0;
  z-index: var(--z-modal);
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
}

.settings-modal-overlay.active {
  display: flex;
}

.settings-modal-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-overlay);
  width: min(560px, 92%);
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.settings-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-primary);
  flex-shrink: 0;
}

.settings-modal-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: 0;
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
}

.settings-modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.settings-modal-body::-webkit-scrollbar {
  width: 6px;
}

.settings-modal-body::-webkit-scrollbar-track {
  background: transparent;
}

.settings-modal-body::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 3px;
}

/* ===================================
   Settings Fieldsets (inside modal)
   =================================== */
.settings-fieldset {
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin: 0 0 var(--space-4) 0;
}

.settings-fieldset:last-child {
  margin-bottom: 0;
}

.settings-legend {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0 var(--space-2);
}

.settings-fieldset.disabled {
  opacity: 0.5;
  pointer-events: none;
  user-select: none;
}

/* Uniform widths inside modal */
.settings-modal-card .settings-group input[type="text"],
.settings-modal-card .settings-group input[type="password"],
.settings-modal-card .settings-group input[type="number"],
.settings-modal-card .settings-group textarea,
.settings-modal-card .settings-group select {
  width: 100%;
}

.settings-display-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* ===================================
   Thinking Block
   =================================== */
.thinking-block {
  margin-bottom: var(--space-3);
  border-left: 2px solid var(--color-accent-muted);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--bg-tertiary);
  overflow: hidden;
}

.thinking-block-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
}

.thinking-block-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-family: inherit;
  padding: 0;
  transition: color var(--transition-fast);
}

.thinking-block-toggle:hover {
  color: var(--text-primary);
}

.thinking-block-toggle svg {
  width: 12px;
  height: 12px;
  transition: transform var(--transition-fast);
}

.thinking-block.open .thinking-block-toggle svg {
  transform: rotate(180deg);
}

.thinking-block-label {
  font-weight: 500;
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
  flex: 1;
}

.thinking-block-content {
  display: none;
  padding: 0 var(--space-3) var(--space-3);
  font-weight: 300;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  max-height: 180px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.thinking-block-content::-webkit-scrollbar {
  width: 4px;
}

.thinking-block-content::-webkit-scrollbar-track {
  background: transparent;
}

.thinking-block-content::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 2px;
}

.thinking-block.open .thinking-block-content {
  display: block;
}

.thinking-block-streaming .thinking-block-label::after {
  content: ' ...';
  animation: thinking-pulse 1.2s infinite;
}

@keyframes thinking-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ===================================
   Message Footer (copy button + stats)
   =================================== */
.message-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding-top: var(--space-2);
  min-height: 0;
}

.message-footer:empty {
  display: none;
}

/* Copy button positioned absolutely inside message-content */
.message-content > .copy-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 2;
}

.message:hover .message-content > .copy-btn,
.message-content > .copy-btn:focus {
  opacity: 1;
}

.message-stats {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.72em;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.message-stat {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  white-space: nowrap;
}

.message-stat-label {
  font-weight: 500;
  color: var(--text-tertiary);
}

.message-stat-value {
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

/* Preset Selector */
.preset-selector-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-3);
  border-bottom: 1px solid var(--border-primary);
}

.preset-select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23737373' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-2) center;
  padding-right: var(--space-8);
}

.preset-select:hover {
  border-color: var(--border-secondary);
  background-color: var(--bg-tertiary);
}

.preset-select:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-primary);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
  outline: none;
}

.preset-select option {
  padding: var(--space-2);
  background-color: #ffffff;
  color: var(--text-primary);
}

.preset-select optgroup {
  font-weight: 600;
  font-style: normal;
  color: var(--text-secondary);
  background-color: #e8e8e8;
  padding: var(--space-2) 0;
}

.preset-select option:disabled {
  color: var(--text-muted);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.settings-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.settings-group.full-width {
  grid-column: 1 / -1;
}

.settings-group.span-2 {
  grid-column: span 2;
}

.settings-label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--settings-label);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Required field indicator */
.required-indicator {
  color: var(--color-error);
  font-weight: 600;
}

/* Input Wrapper */
.input-wrapper {
  position: relative;
  display: flex;
  align-items: stretch;
}

.input-wrapper input,
.input-wrapper textarea {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  padding-right: 32px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.input-wrapper input:hover,
.input-wrapper textarea:hover {
  border-color: var(--border-secondary);
}

.input-wrapper input:focus,
.input-wrapper textarea:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-primary);
  box-shadow: 0 0 0 5px var(--color-accent-muted);
}

.input-wrapper input::placeholder,
.input-wrapper textarea::placeholder {
  color: var(--text-muted);
}

.input-wrapper textarea {
  min-height: 72px;
  resize: vertical;
  line-height: var(--leading-relaxed);
}

/* Unified Copy Buttons */
[data-copy-enabled] {
  position: relative;
}

.copy-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  color: var(--color-accent);
  transform: scale(1.1);
}

.copy-btn:active {
  transform: scale(0.95);
}

.copy-btn.copied {
  opacity: 1;
  color: var(--color-success);
}

.copy-btn svg {
  width: 14px;
  height: 14px;
}

/* Copy button inside input wrappers — positioned to the right */
.input-wrapper > .copy-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0;
  z-index: 1;
}

.input-wrapper:hover > .copy-btn,
.input-wrapper > .copy-btn:focus {
  opacity: 1;
}

/* Copy button inside chat input container — positioned to the right */
.chat-input-container > .copy-btn {
  position: absolute;
  right: 8px;
  top: 8px;
  opacity: 0;
  z-index: 1;
}

.chat-input-container:hover > .copy-btn,
.chat-input-container > .copy-btn:focus {
  opacity: 1;
}

.copy-inline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.copy-inline .copy-btn {
  position: static;
  opacity: 0;
}

/* Password Input */
.input-wrapper input[type="password"] {
  padding-right: 56px;
}

.input-toggle-password {
  position: absolute;
  right: 32px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.input-toggle-password:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

.advanced-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  align-items: center;
}

.range-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.range-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.range-value {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

input[type="range"] {
  width: 100%;
  height: 4px;
  background: var(--border-primary);
  border-radius: var(--radius-full);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--color-accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

input[type="number"] {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

input[type="number"]:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-primary);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

/* Theme Toggle */
.theme-toggle-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.theme-toggle-label {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.theme-toggle {
  position: relative;
  width: 36px;
  height: 20px;
  background-color: var(--border-primary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-base);
}

.theme-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.theme-toggle-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background-color: var(--bg-primary);
  border-radius: 50%;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.theme-toggle-slider svg {
  width: 10px;
  height: 10px;
  color: var(--text-tertiary);
}

.theme-toggle input:checked + .theme-toggle-slider {
  left: 18px;
}

/* Settings Toggle Button */
.settings-toggle-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: transparent;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.settings-toggle-btn:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

/* ===================================
   Chat Area
   =================================== */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-primary);
  min-height: 0;
  position: relative;
}

.chat-messages {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-4);
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: var(--radius-full);
}

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

/* Empty State */
.chat-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  padding: var(--space-8);
}

.chat-empty-state-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  color: var(--text-muted);
  opacity: 0.5;
}

.chat-empty-state-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.chat-empty-state-description {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  max-width: 320px;
}

/* Message Styles */
.message {
  animation: message-fade-in 0.2s ease;
}

.message-user:not(:has(.debug-box)) {
  margin-bottom: var(--space-3);
}

.message-assistant {
  margin-bottom: var(--space-4);
}

@keyframes message-fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-header {
  padding: 0 4px;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.message-avatar {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: 600;
  background-color: var(--color-accent);
  color: var(--text-inverse);
}

.message-assistant .message-avatar {
  background-color: #d77937;
}

.message-role {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
}

.message-time {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.message-content {
  position: relative;
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  line-height: var(--leading-relaxed);
  font-size: var(--text-sm);
  background-color: var(--bg-user-message);
  border: 1px solid var(--border-message);
}

/* Message Images Container */
.message-images {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.message-images:empty {
  display: none;
}

.message-images .attached-image {
  max-width: 200px;
  max-height: 200px;
  border-radius: var(--radius-md);
  object-fit: cover;
}

/* Message Text Container */
.message-text {
  overflow-wrap: break-word;
  word-wrap: break-word;
}


/* Message Content Typography */
.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
  font-weight: 600;
  color: var(--text-primary);
  line-height: var(--leading-tight);
}

.message-content h1:first-child,
.message-content h2:first-child,
.message-content h3:first-child,
.message-content h4:first-child {
  margin-top: 0;
}

.message-content h1 { font-size: 1.25em; }
.message-content h2 { font-size: 1.125em; }
.message-content h3 { font-size: 1em; }

.message-content p {
  margin-bottom: var(--space-3);
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content ul,
.message-content ol {
  margin-bottom: var(--space-3);
  padding-left: var(--space-5);
}

.message-content li {
  margin-bottom: var(--space-2);
}

.message-content li:last-child {
  margin-bottom: 0;
}

.message-content blockquote {
  margin: var(--space-4) 0;
  padding-left: var(--space-3);
  border-left: 2px solid var(--border-secondary);
  color: var(--text-secondary);
}

/* Horizontal Rule */
.message-content hr {
  margin: var(--space-4) 0;
  border: none;
  border-top: 1px solid var(--border-secondary);
}

/* Line breaks (br) - add some spacing for readability */
.message-content br {
  content: "";
  display: block;
  margin-bottom: var(--space-2);
}

.message-content a {
  color: var(--color-accent);
  text-decoration: none;
}

.message-content a:hover {
  text-decoration: underline;
}

.message-content strong {
  font-weight: 600;
}

/* Inline Code */
.message-content code:not(pre code) {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 2px 5px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875em;
}

/* Code Blocks */
.code-block-wrapper {
  position: relative;
  margin: var(--space-4) 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-primary);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-neutral-800);
  border-bottom: 1px solid var(--color-neutral-700);
}

.code-block-language {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-neutral-400);
  text-transform: lowercase;
}

/* Code block copy button — always visible */
.code-block-header .copy-btn {
  opacity: 1;
  color: var(--color-neutral-400);
}

.code-block-header .copy-btn:hover {
  color: var(--color-neutral-200);
}


.code-block-wrapper pre {
  margin: 0;
  padding: var(--space-3);
  background-color: var(--bg-code);
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.code-block-wrapper pre::-webkit-scrollbar {
  height: 6px;
}

.code-block-wrapper pre::-webkit-scrollbar-track {
  background: transparent;
}

.code-block-wrapper pre::-webkit-scrollbar-thumb {
  background-color: var(--border-primary);
  border-radius: 3px;
}

.code-block-wrapper pre::-webkit-scrollbar-thumb:hover {
  background-color: var(--border-secondary);
}

.code-block-wrapper code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
  color: var(--text-code);
}

/* Tables */
.message-content .table-wrapper {
  overflow-x: auto;
  margin: var(--space-4) 0;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.message-content .table-wrapper::-webkit-scrollbar {
  height: 6px;
}

.message-content .table-wrapper::-webkit-scrollbar-track {
  background: transparent;
}

.message-content .table-wrapper::-webkit-scrollbar-thumb {
  background-color: var(--border-primary);
  border-radius: 3px;
}

.message-content .table-wrapper::-webkit-scrollbar-thumb:hover {
  background-color: var(--border-secondary);
}

.message-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  min-width: max-content;
}

.message-content th,
.message-content td {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-primary);
  text-align: left;
}

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

/* Math (KaTeX) */
.message-content .katex-display {
  margin: var(--space-3) 0;
  overflow-x: auto;
  padding: var(--space-2) 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.message-content .katex-display::-webkit-scrollbar {
  height: 6px;
}

.message-content .katex-display::-webkit-scrollbar-track {
  background: transparent;
}

.message-content .katex-display::-webkit-scrollbar-thumb {
  background-color: var(--border-primary);
  border-radius: 3px;
}

.message-content .katex-display::-webkit-scrollbar-thumb:hover {
  background-color: var(--border-secondary);
}

/* ===================================
   Chat Input Area
   =================================== */
.chat-input-area {
  padding: var(--space-3) var(--space-4);
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-primary);
  flex-shrink: 0;
}

.chat-input-wrapper {
  display: flex;
  gap: var(--space-2);
}

.chat-input-container {
  flex: 1;
  position: relative;
}

.chat-input {
  width: 100%;
  min-height: 40px;
  max-height: 160px;
  padding: var(--space-2) 36px var(--space-2) var(--space-3);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--text-primary);
  resize: none;
  transition: all var(--transition-fast);
  line-height: var(--leading-normal);
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.chat-input:focus {
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

.chat-input:focus-visible {
  outline: 1px solid var(--color-accent);
  outline-offset: 0;
}

.chat-input::placeholder {
  color: var(--text-muted);
}


.chat-send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background-color: var(--color-accent);
  border: none;
  border-radius: var(--radius-lg);
  color: var(--text-inverse);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.chat-send-btn:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
}

.chat-send-btn:disabled {
  background-color: var(--border-primary);
  cursor: not-allowed;
}

.chat-send-btn svg {
  width: 18px;
  height: 18px;
}

/* ===================================
   Action Buttons (Clear, Export)
   =================================== */
.action-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.action-btn:hover {
  background-color: var(--bg-secondary);
  border-color: var(--border-secondary);
  color: var(--text-primary);
}

.action-btn svg {
  width: 14px;
  height: 14px;
}

/* Icon-only action buttons */
.action-btn-icon {
  padding: var(--space-1);
  width: 28px;
  height: 28px;
  justify-content: center;
}

.action-btn-icon svg {
  width: 16px;
  height: 16px;
}

.action-btn-danger {
  color: var(--color-error);
  border-color: rgba(239, 68, 68, 0.3);
}

.action-btn-danger:hover {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--color-error);
  color: var(--color-error);
}

/* ===================================
   File Attachment
   =================================== */
.file-input-hidden {
  display: none;
}

.attach-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.attach-btn:hover {
  background-color: var(--bg-secondary);
  border-color: var(--border-secondary);
  color: var(--color-accent);
}

.attach-btn svg {
  width: 18px;
  height: 18px;
}

.attachments-preview {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2);
  margin-bottom: var(--space-2);
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-primary);
}

.attachment-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--bg-primary);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  border: 1px solid var(--border-primary);
  max-width: 200px;
}

.attachment-icon {
  display: flex;
  color: var(--text-tertiary);
}

.attachment-icon svg {
  width: 14px;
  height: 14px;
}

.attachment-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-secondary);
}

.attachment-remove {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-xs);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.attachment-remove:hover {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-error);
}

.attachment-remove svg {
  width: 12px;
  height: 12px;
}

/* ===================================
   Error Message in Chat
   =================================== */
.message-error {
  background-color: rgba(239, 68, 68, 0.05);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin: var(--space-2) 0;
}

.message-error .message-header {
  color: var(--color-error);
}

.message-error .error-avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background-color: rgba(239, 68, 68, 0.1);
  border-radius: 50%;
  color: var(--color-error);
}

.message-error .error-avatar svg {
  width: 16px;
  height: 16px;
}

.message-error .error-content {
  color: var(--color-error);
  font-size: var(--text-sm);
}

/* ===================================
   Retry Button
   =================================== */
.message-retry-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  margin-left: auto;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: all var(--transition-fast);
}

.message:hover .message-retry-btn,
.message-retry-btn:focus {
  opacity: 1;
}

.message-retry-btn:hover {
  background-color: var(--bg-tertiary);
  color: var(--color-accent);
}

.message-retry-btn svg {
  width: 14px;
  height: 14px;
}

/* ===================================
   Debug Boxes
   =================================== */
.debug-box {
  font-size: var(--text-xs);
  overflow: hidden;
}

.debug-box-header-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-content: flex-end;
}

.debug-box-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  text-align: left;
  transition: background var(--transition-fast);
}

.debug-box-header:hover {
  background: var(--bg-secondary);
}


.debug-box-arrow {
  font-size: 10px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.debug-box-title {
  font-weight: 500;
}

.debug-box-content {
  max-height: 300px;
  overflow: auto;
  margin: 0 var(--space-2) var(--space-2);
  padding: var(--space-2);
  background: var(--bg-code);
  border-radius: var(--radius-sm);
  scrollbar-width: thin;
  scrollbar-color: var(--border-primary) transparent;
}

.debug-box-content::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.debug-box-content::-webkit-scrollbar-track {
  background: transparent;
}

.debug-box-content::-webkit-scrollbar-thumb {
  background: var(--border-primary);
  border-radius: 4px;
}

.debug-box-content pre {
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-code);
}

/* JSON syntax highlighting */
.debug-box-content .json-key {
  color: #9cdcfe;
}

.debug-box-content .json-string {
  color: #ce9178;
}

.debug-box-content .json-number {
  color: #b5cea8;
}

.debug-box-content .json-boolean {
  color: #569cd6;
}

.debug-box-content .json-null {
  color: #569cd6;
}

.debug-box-content .json-bracket {
  color: #d4d4d4;
}

.debug-box-content .json-truncated {
  opacity: 0.7;
}


.debug-full-value {
  display: none !important;
}

/* Error report button */
.error-report-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  margin-left: auto;
  background: transparent;
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-sm);
  color: var(--color-error);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.error-report-btn:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--color-error);
}

.error-report-btn svg {
  width: 12px;
  height: 12px;
}

/* Mobile adjustments for debug boxes */
@media (max-width: 768px) {
  .debug-box-content {
    max-height: 200px;
    margin: 0 var(--space-1) var(--space-1);
  }
  
  .debug-box-content pre {
    font-size: 11px;
  }
}

/* ===================================
   Toast Notifications
   =================================== */
.toast-container {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: toast-slide-in 0.2s ease;
}

@keyframes toast-slide-in {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast-success {
  border-left: 3px solid var(--color-success);
}

.toast-error {
  border-left: 3px solid var(--color-error);
}

.toast-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.toast-success .toast-icon {
  color: var(--color-success);
}

.toast-error .toast-icon {
  color: var(--color-error);
}

.toast-message {
  font-size: var(--text-sm);
  color: var(--text-primary);
}

/* ===================================
   Loading / Typing Indicator
   =================================== */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: var(--space-3);
}

.typing-indicator span {
  width: 6px;
  height: 6px;
  background-color: var(--text-muted);
  border-radius: 50%;
  animation: typing-bounce 1.2s infinite ease-in-out both;
}

.typing-indicator span:nth-child(1) { animation-delay: -0.24s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.12s; }

@keyframes typing-bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

/* ===================================
   Utility Classes
   =================================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  .settings-grid {
    grid-template-columns: 1fr;
  }
  
  .settings-group.span-2 {
    grid-column: 1;
  }
  
  .advanced-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .app-container {
    border-left: none;
    border-right: none;
    border-radius: 0;
  }
}

@media (max-width: 480px) {
  html, body {
    overflow-x: hidden;
  }

  .app-container {
    width: 100%;
    max-width: 100vw;
    height: calc(100dvh - 44px);
    min-height: calc(100dvh - 44px);
    max-height: calc(100dvh - 44px);
  }

  .advanced-grid {
    grid-template-columns: 1fr;
  }
  
  .tab-bar {
    padding: 0 var(--space-2);
    gap: var(--space-1);
  }
  
  .tab-item {
    padding: 0 var(--space-2);
    min-width: 80px;
  }

  .tab-name {
    max-width: 60px;
  }
  
  .preset-selector-wrapper {
    padding-bottom: var(--space-2);
    margin-bottom: var(--space-2);
  }
  
  .chat-area {
    min-height: 0;
    flex: 1;
  }

  .chat-input-area {
    padding: var(--space-2);
    padding-bottom: calc(var(--space-2) + env(safe-area-inset-bottom, 0px));
  }

  .chat-input {
    min-height: 36px;
    padding: var(--space-2);
    padding-right: 32px;
    font-size: 16px; /* Prevent zoom on iOS */
  }

  .chat-send-btn,
  .attach-btn {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
  }

  .attachments-preview {
    padding: var(--space-1);
    gap: var(--space-1);
  }

  .attachment-item {
    max-width: 150px;
  }
  
  .toast-container {
    left: var(--space-2);
    right: var(--space-2);
    bottom: calc(var(--space-2) + env(safe-area-inset-bottom, 0px));
  }

  .message {
    padding: var(--space-2);
  }

  .message-content {
    font-size: var(--text-sm);
    padding: var(--space-2);
  }

  /* Compact horizontal padding on mobile */
  .message-content p {
    margin-bottom: var(--space-2);
  }

  .message-content ul,
  .message-content ol {
    padding-left: var(--space-4);
    margin-bottom: var(--space-2);
  }

  .message-content blockquote {
    margin: var(--space-3) 0;
    padding-left: var(--space-2);
  }

  .message-content .table-wrapper {
    margin: var(--space-3) calc(-1 * var(--space-2));
    padding: 0 var(--space-2);
  }

  .message-content th,
  .message-content td {
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
  }

  .message-images .attached-image {
    max-width: 150px;
    max-height: 150px;
  }

  .code-block-wrapper {
    margin: var(--space-2) calc(-1 * var(--space-2));
    border-radius: 0;
  }
}

/* ===================================
   Continue Button (for truncated responses)
   =================================== */
.continue-wrapper {
  display: flex;
  justify-content: center;
  padding: var(--space-2) var(--space-4);
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
}

.continue-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-accent-muted);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-full);
  color: var(--color-accent);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.continue-btn:hover {
  background-color: var(--color-accent);
  color: var(--text-inverse);
}

.continue-btn svg {
  width: 14px;
  height: 14px;
}

/* ===================================
   Info Tooltips
   =================================== */
.info-tooltip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: var(--space-1);
  color: var(--text-muted);
  cursor: help;
  vertical-align: middle;
}

.info-tooltip:hover {
  color: var(--text-secondary);
}

.info-tooltip svg {
  width: 14px;
  height: 14px;
}

/* ===================================
   Toggle Label (for checkboxes)
   =================================== */
.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.toggle-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.setting-hint {
  margin-top: var(--space-1);
  margin-bottom: 0;
  color: var(--text-muted);
  font-size: var(--text-xs);
}

/* ===================================
   Generated Images
   =================================== */
.generated-image {
  max-width: 100%;
  max-height: 400px;
  border-radius: var(--radius-lg);
  margin: var(--space-4) 0;
  box-shadow: var(--shadow-md);
  object-fit: contain;
}

.message-content .generated-image {
  display: block;
}

/* ===================================
   Attached Images (User uploads)
   =================================== */

.attached-image {
  max-width: 200px;
  max-height: 200px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  object-fit: cover;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.attached-image:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

/* ===================================
   Tools List (MCP Servers)
   =================================== */
.tools-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.tool-entry {
  display: grid;
  grid-template-columns: 1fr 1.5fr auto auto;
  gap: var(--space-2);
  align-items: center;
  padding: var(--space-2);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast);
}

.tool-entry:hover {
  border-color: var(--border-secondary);
}

.tool-entry input[type="text"] {
  width: 100%;
  padding: var(--space-1) var(--space-2);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: var(--text-xs);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.tool-entry input[type="text"]:focus {
  border-color: var(--border-focus);
  outline: none;
  box-shadow: 0 0 0 2px var(--color-accent-muted);
}

.tool-entry input[type="text"]::placeholder {
  color: var(--text-muted);
}

.tool-entry .tool-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-entry .tool-toggle input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-accent);
  cursor: pointer;
}

.tool-remove-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tool-remove-btn:hover {
  color: var(--color-error);
  background: var(--bg-tertiary);
}

.tool-remove-btn svg {
  width: 14px;
  height: 14px;
}

.tools-add-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  margin-top: var(--space-2);
  background: none;
  border: 1px dashed var(--border-secondary);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tools-add-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-muted);
}

.tools-add-btn svg {
  width: 14px;
  height: 14px;
}

.tools-list:empty + .tools-add-btn {
  margin-top: 0;
}

@media (max-width: 480px) {
  .tool-entry {
    grid-template-columns: 1fr auto auto;
  }

  .tool-entry input[data-tool-field="name"] {
    grid-column: 1 / -1;
  }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
  .tab-bar,
  .chat-input-area,
  .copy-btn,
  .continue-wrapper {
    display: none !important;
  }
  
  .app-container {
    height: auto;
    border: none;
  }
  
  .chat-messages {
    overflow: visible;
  }
}

/* ===================================
   Reduced Motion
   =================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===================================
   Test Configuration Toggle
   =================================== */
.test-config-wrapper {
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-3);
}

.test-config-wrapper .toggle-label {
  font-weight: 500;
  font-size: var(--text-sm);
}

.test-config-wrapper .setting-hint {
  margin-left: calc(16px + var(--space-2)); /* Align with label text after checkbox */
  margin-top: var(--space-1);
  margin-bottom: 0;
}

/* Disabled state for settings when test config is on */
.preset-selector-wrapper.disabled,
.settings-grid.disabled {
  opacity: 0.5;
  pointer-events: none;
  user-select: none;
}

.preset-selector-wrapper.disabled select,
.settings-grid.disabled input,
.settings-grid.disabled textarea,
.settings-grid.disabled select {
  background: var(--bg-tertiary);
  cursor: not-allowed;
}

/* ===================================
   Model Type Select (styled like preset)
   =================================== */
.settings-group select[data-field="model-type"] {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23737373' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-2) center;
  padding-right: var(--space-8);
}

.settings-group select[data-field="model-type"]:hover {
  border-color: var(--border-secondary);
  background-color: var(--bg-tertiary);
}

.settings-group select[data-field="model-type"]:focus {
  border-color: var(--border-focus);
  background-color: var(--bg-primary);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
  outline: none;
}