/* ============================================================
   Ventrilo Theme for LibreChat — 2026 Redesign
   Brand Identity: Amber (#F59E0B) + Blue (#3B82F6)
   Inspiration: Gemini 2026 (minimalist, Material You) + ChatGPT (whitespace)
   Injection: nginx sub_filter <head> -> <head><link ...>
   Variables: LibreChat ThemeDefinition compatible (--rgb-* prefixed)
   Dark Mode: Full coverage via .dark class
   ============================================================ */

/* 1. Global Resets & Typography */
:root {
  --ventrilo-font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ventrilo-gradient: linear-gradient(135deg, #F59E0B 0%, #3B82F6 100%);
  --ventrilo-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --ventrilo-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --ventrilo-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --ventrilo-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  --ventrilo-radius-sm: 6px;
  --ventrilo-radius-md: 12px;
  --ventrilo-radius-lg: 16px;
  --ventrilo-radius-xl: 24px;
  --ventrilo-radius-full: 9999px;

  --ventrilo-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --ventrilo-transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --ventrilo-transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: var(--ventrilo-font);
  font-size: 16px;
  line-height: 1.6;
  color: rgb(var(--rgb-text-primary));
  background: rgb(var(--rgb-surface-primary));
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--ventrilo-transition-slow), color var(--ventrilo-transition-slow);
}

/* 2. Input Bar — Clean, Rounded, Natural Flow (NOT fixed) */
.prompt-composer,
.chat-input-container,
form.chat-form {
  position: sticky;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  max-width: 768px;
  margin: 0 auto;
  padding: 16px 24px;
  background: rgb(var(--rgb-surface-primary) / 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid rgb(var(--rgb-border-light));
  box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.05);
  z-index: 40;
}

.prompt-composer textarea,
.chat-input-container textarea,
form.chat-form textarea {
  width: 100%;
  min-height: 52px;
  max-height: 200px;
  padding: 16px 20px;
  font-size: 1rem;
  line-height: 1.5;
  color: rgb(var(--rgb-text-primary));
  background: rgb(var(--rgb-surface-secondary));
  border: 1px solid rgb(var(--rgb-border-light));
  border-radius: var(--ventrilo-radius-xl);
  resize: none;
  outline: none;
  transition: border-color var(--ventrilo-transition-base), box-shadow var(--ventrilo-transition-base);
}

.prompt-composer textarea:focus,
.chat-input-container textarea:focus,
form.chat-form textarea:focus {
  border-color: rgb(var(--rgb-accent-primary));
  box-shadow: 0 0 0 3px rgb(var(--rgb-accent-primary) / 0.15);
}

.prompt-composer textarea::placeholder,
.chat-input-container textarea::placeholder,
form.chat-form textarea::placeholder {
  color: rgb(var(--rgb-text-muted));
}

/* 3. Model Selector Pill */
.model-selector-button,
.model-select {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgb(var(--rgb-text-primary));
  background: rgb(var(--rgb-surface-primary));
  border: 1px solid rgb(var(--rgb-border-light));
  border-radius: var(--ventrilo-radius-full);
  cursor: pointer;
  transition: all var(--ventrilo-transition-base);
}

.model-selector-button:hover,
.model-select:hover {
  background: rgb(var(--rgb-surface-hover));
  border-color: rgb(var(--rgb-accent-primary));
}

.model-selector-button:focus-visible,
.model-select:focus-visible {
  outline: 2px solid rgb(var(--rgb-accent-primary));
  outline-offset: 2px;
}

/* 4. Message Bubbles */
.message[data-role="user"],
.user-message {
  max-width: 768px;
  margin: 0 auto 24px;
  padding: 12px 16px;
  background: rgb(var(--rgb-brand-purple) / 0.06);
  border-radius: var(--ventrilo-radius-lg);
  animation: ventrilo-message-in 300ms ease-out both;
}

.message[data-role="assistant"],
.assistant-message {
  max-width: 768px;
  margin: 0 auto 24px;
  padding: 12px 0;
  background: transparent;
  animation: ventrilo-message-in 300ms ease-out both;
}

.message[data-role="user"] p,
.user-message p {
  margin: 0;
  line-height: 1.6;
}

.message[data-role="assistant"] p,
.assistant-message p {
  margin: 0 0 12px 0;
  line-height: 1.7;
}

.message[data-role="assistant"] p:last-child,
.assistant-message p:last-child {
  margin-bottom: 0;
}

/* 5. Code Blocks */
pre {
  position: relative;
  margin: 16px 0;
  padding: 16px;
  background: rgb(var(--rgb-surface-code-body));
  border: 1px solid rgb(var(--rgb-border-light));
  border-radius: var(--ventrilo-radius-md);
  overflow-x: auto;
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
}

code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 0.875em;
  padding: 2px 6px;
  background: rgb(var(--rgb-surface-secondary));
  border-radius: var(--ventrilo-radius-sm);
}

pre code {
  padding: 0;
  background: transparent;
  border-radius: 0;
}

/* 6. Sidebar Refinements */
.sidebar-nav,
.sidebar-aside {
  border-right: 1px solid rgb(var(--rgb-border-light));
  background: rgb(var(--rgb-surface-primary-alt));
}

.new-chat-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px 16px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: white;
  background: rgb(var(--rgb-brand-purple));
  border: none;
  border-radius: var(--ventrilo-radius-md);
  cursor: pointer;
  transition: all var(--ventrilo-transition-base);
}

.new-chat-button:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: var(--ventrilo-shadow-md);
}

.new-chat-button:active {
  transform: translateY(0);
}

.new-chat-button:focus-visible {
  outline: 2px solid rgb(var(--rgb-accent-primary));
  outline-offset: 2px;
}

.conversation-link,
.history-item {
  display: block;
  padding: 10px 12px;
  margin: 2px 8px;
  color: rgb(var(--rgb-text-primary));
  border-radius: var(--ventrilo-radius-md);
  text-decoration: none;
  transition: background-color var(--ventrilo-transition-fast);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.conversation-link:hover,
.history-item:hover {
  background: rgb(var(--rgb-surface-hover));
}

.conversation-link[aria-current="true"],
.history-item.active {
  background: rgb(var(--rgb-surface-active));
  border-left: 3px solid rgb(var(--rgb-brand-purple));
  font-weight: 500;
}

.conversation-link:focus-visible,
.history-item:focus-visible {
  outline: 2px solid rgb(var(--rgb-accent-primary));
  outline-offset: 2px;
}

/* 7. Typing Indicator Animation */
@keyframes ventrilo-typing-pulse {
  0%, 100% {
    transform: scale(0.8);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.2);
    opacity: 1;
  }
}

.typing-indicator span,
.loading-dots span {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin: 0 2px;
  background: rgb(var(--rgb-brand-purple));
  border-radius: 50%;
  animation: ventrilo-typing-pulse 1.4s ease-in-out infinite;
}

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

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

/* 8. Send Button */
.send-button,
button[type="submit"].chat-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: rgb(var(--rgb-brand-purple));
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--ventrilo-transition-base);
  flex-shrink: 0;
}

.send-button:hover:not(:disabled),
button[type="submit"].chat-submit:hover:not(:disabled) {
  filter: brightness(1.1);
  transform: scale(1.05);
  box-shadow: var(--ventrilo-shadow-md);
}

.send-button:active:not(:disabled),
button[type="submit"].chat-submit:active:not(:disabled) {
  transform: scale(0.95);
}

.send-button:disabled,
button[type="submit"].chat-submit:disabled {
  background: rgb(var(--rgb-surface-hover));
  color: rgb(var(--rgb-text-muted));
  cursor: not-allowed;
}

.send-button:focus-visible,
button[type="submit"].chat-submit:focus-visible {
  outline: 2px solid rgb(var(--rgb-accent-primary));
  outline-offset: 2px;
}

/* 9. Empty State / Landing Page */
.empty-state,
.landing-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
  text-align: center;
}

.empty-state-logo,
.landing-logo {
  width: 80px;
  height: 80px;
  margin-bottom: 24px;
  background: var(--ventrilo-gradient);
  border-radius: var(--ventrilo-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--ventrilo-shadow-lg);
  animation: ventrilo-logo-float 3s ease-in-out infinite;
}

@keyframes ventrilo-logo-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.empty-state-title,
.landing-title {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 12px 0;
  background: var(--ventrilo-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.empty-state-subtitle,
.landing-subtitle {
  font-size: 1.125rem;
  color: rgb(var(--rgb-text-secondary));
  margin: 0 0 32px 0;
  max-width: 480px;
}

.empty-state-suggestions,
.landing-suggestions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  max-width: 640px;
  width: 100%;
}

.suggestion-card {
  padding: 16px;
  background: rgb(var(--rgb-surface-secondary));
  border: 1px solid rgb(var(--rgb-border-light));
  border-radius: var(--ventrilo-radius-md);
  cursor: pointer;
  transition: all var(--ventrilo-transition-base);
  text-align: left;
}

.suggestion-card:hover {
  background: rgb(var(--rgb-surface-hover));
  border-color: rgb(var(--rgb-accent-primary));
  transform: translateY(-2px);
  box-shadow: var(--ventrilo-shadow-md);
}

.suggestion-card:focus-visible {
  outline: 2px solid rgb(var(--rgb-accent-primary));
  outline-offset: 2px;
}

/* 10. Mobile Responsive */
@media (max-width: 767px) {
  .prompt-composer,
  .chat-input-container,
  form.chat-form {
    padding: 12px 16px;
  }

  .message[data-role="user"],
  .user-message,
  .message[data-role="assistant"],
  .assistant-message {
    padding: 10px 14px;
  }

  .empty-state-title,
  .landing-title {
    font-size: 1.5rem;
  }

  .empty-state-subtitle,
  .landing-subtitle {
    font-size: 1rem;
  }

  .empty-state-suggestions,
  .landing-suggestions {
    grid-template-columns: 1fr;
  }

  /* Touch targets minimum 44px */
  button,
  a,
  [role="button"] {
    min-height: 44px;
    min-width: 44px;
  }

  .conversation-link,
  .history-item {
    min-height: 48px;
    padding: 12px;
  }

  .desktop-hint,
  .drag-drop-zone {
    display: none;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .prompt-composer,
  .chat-input-container,
  form.chat-form {
    max-width: 640px;
  }

  .message[data-role="user"],
  .user-message,
  .message[data-role="assistant"],
  .assistant-message {
    max-width: 640px;
  }
}

/* 11. Smooth Transitions & Animations */
@keyframes ventrilo-message-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes ventrilo-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

html.theme-transitioning,
html.theme-transitioning * {
  transition: background-color var(--ventrilo-transition-slow),
              color var(--ventrilo-transition-slow),
              border-color var(--ventrilo-transition-slow);
}

button:active,
[role="button"]:active {
  transform: scale(0.96);
}

/* 12. Dark Mode Overrides */
.dark body {
  color: rgb(var(--rgb-text-primary));
  background: rgb(var(--rgb-surface-primary));
}

.dark .prompt-composer,
.dark .chat-input-container,
.dark form.chat-form {
  background: rgb(var(--rgb-surface-primary) / 0.8);
  border-top-color: rgb(var(--rgb-border-light));
}

.dark .message[data-role="user"],
.dark .user-message {
  background: rgb(var(--rgb-brand-purple) / 0.08);
}

.dark .message[data-role="assistant"],
.dark .assistant-message {
  background: transparent;
}

.dark pre {
  background: rgb(var(--rgb-surface-code-body));
  border-color: rgb(var(--rgb-border-light));
}

.dark .sidebar-nav,
.dark .sidebar-aside {
  background: rgb(var(--rgb-surface-primary-alt));
  border-right-color: rgb(var(--rgb-border-light));
}

.dark .conversation-link,
.dark .history-item {
  color: rgb(var(--rgb-text-primary));
}

.dark .conversation-link[aria-current="true"],
.dark .history-item.active {
  background: rgb(var(--rgb-surface-active));
  border-left-color: rgb(var(--rgb-brand-purple));
}

.dark ::placeholder {
  color: rgb(var(--rgb-text-muted));
}

/* 13. Accessibility Focus States (WCAG AA) */
*:focus-visible {
  outline: 2px solid rgb(var(--rgb-accent-primary));
  outline-offset: 2px;
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid rgb(var(--rgb-accent-primary));
  outline-offset: 0;
}

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  padding: 8px 16px;
  background: rgb(var(--rgb-brand-purple));
  color: white;
  text-decoration: none;
  z-index: 10000;
  border-radius: 0 0 var(--ventrilo-radius-sm) 0;
}

.skip-link:focus {
  top: 0;
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
  .message[data-role="user"],
  .user-message {
    border: 2px solid rgb(var(--rgb-border-medium));
  }

  .send-button,
  button[type="submit"].chat-submit {
    border: 2px solid white;
  }
}