/* --- Base Variables and Setup --- */
:root {
  /* Color Palette (Modern & Vibrant) */
  --primary-hue: 230; /* Base hue for blues */
  --secondary-hue: 170; /* Base hue for teals/greens */
  --accent-hue: 0; /* Base hue for reds/pinks */

  --primary: hsl(var(--primary-hue), 70%, 60%); /* #5c67f2 */
  --primary-light: hsl(var(--primary-hue), 70%, 75%);
  --primary-dark: hsl(var(--primary-hue), 60%, 45%);
  --primary-ultra-light: hsl(var(--primary-hue), 70%, 96%);

  --secondary: hsl(var(--secondary-hue), 65%, 50%); /* #2db89e */
  --secondary-light: hsl(var(--secondary-hue), 65%, 70%);
  --secondary-dark: hsl(var(--secondary-hue), 55%, 35%);

  --accent: hsl(var(--accent-hue), 100%, 65%); /* #ff4d4d */
  --accent-light: hsl(var(--accent-hue), 100%, 75%);
  --accent-dark: hsl(var(--accent-hue), 80%, 50%);

  --success: #2ecc71;
  --warning: #f39c12;
  --error: #e74c3c;

  /* Grayscale & Backgrounds */
  --gray-900: #1a1d24;
  --gray-800: #252a33;
  --gray-700: #3c4250;
  --gray-600: #5a6170;
  --gray-500: #858c99;
  --gray-400: #adb5bd;
  --gray-300: #ced4da;
  --gray-200: #e9ecef;
  --gray-100: #f1f3f5;
  --gray-50: #f8f9fa;

  --bg-light: var(--gray-50);
  --bg-dark: var(--gray-900);
  --bg-sidebar-light: #ffffff;
  --bg-sidebar-dark: var(--gray-800);
  --bg-header-light: linear-gradient(100deg, var(--primary), hsl(var(--primary-hue), 70%, 65%));
  --bg-header-dark: linear-gradient(100deg, var(--primary-dark), var(--primary));
  --bg-input-light: #ffffff;
  --bg-input-dark: var(--gray-800);

  /* Text Colors */
  --text-light: var(--gray-100);
  --text-dark: var(--gray-800);
  --text-muted-light: var(--gray-600);
  --text-muted-dark: var(--gray-400);
  --text-primary: var(--primary);
  --text-on-primary: #ffffff;
  --text-on-dark: var(--gray-200);

  /* Bubbles */
  --user-bubble-bg: var(--primary);
  --user-bubble-text: var(--text-on-primary);
  --bot-bubble-bg-light: var(--gray-100);
  --bot-bubble-bg-dark: var(--gray-700);
  --bot-bubble-text-light: var(--text-dark);
  --bot-bubble-text-dark: var(--text-on-dark);

  /* Shadows (Subtle & Layered) */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow: 0 4px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 6px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
  --shadow-inset: inset 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-focus: 0 0 0 3px hsla(var(--primary-hue), 70%, 60%, 0.25);

  /* Borders */
  --border-light: 1px solid var(--gray-200);
  --border-dark: 1px solid var(--gray-700);
  --border-primary: 1px solid var(--primary-light);

  /* Layout & Sizing */
  --sidebar-width: 300px;
  --header-height: 65px;
  --border-radius-sm: 6px;
  --border-radius: 12px;
  --border-radius-lg: 18px;
  --border-radius-pill: 50px;
  --border-radius-circle: 50%;
  --bubble-radius: 16px;

  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-norm: 0.25s ease-out;
  --transition-slow: 0.4s ease-out;
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Typography */
  --font-primary: 'Vazirmatn', sans-serif;
  --font-secondary: 'Estedad', sans-serif;
  --line-height-base: 1.65;
  --line-height-heading: 1.3;
}

/* --- Dark Theme --- */
.dark-theme {
  --bg-light: var(--bg-dark);
  --bg-sidebar-light: var(--bg-sidebar-dark);
  --bg-header-light: var(--bg-header-dark);
  --bg-input-light: var(--bg-input-dark);

  --text-dark: var(--text-light);
  --text-muted-light: var(--text-muted-dark);

  --bot-bubble-bg-light: var(--bot-bubble-bg-dark);
  --bot-bubble-text-light: var(--bot-bubble-text-dark);

  --border-light: var(--border-dark);
  --shadow-focus: 0 0 0 3px hsla(var(--primary-hue), 70%, 75%, 0.25);

  /* Invert specific elements if needed */
  .model-avatar, .welcome-icon {
    filter: brightness(0.9);
  }
  .logo-icon {
     filter: brightness(0.95);
  }

  /* PrismJS Dark Theme adjustments */
  .token.operator, .token.entity, .token.url, .language-css .token.string, .style .token.string {
      background: none;
  }
}

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

html {
  font-size: 16px; /* Base font size */
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-light);
  color: var(--text-dark);
  min-height: 100vh;
  overflow: hidden;
  transition: background-color var(--transition-norm), color var(--transition-norm);
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background-color: var(--gray-300);
  border-radius: var(--border-radius-pill);
  border: 2px solid var(--bg-light); /* Match body background */
}
::-webkit-scrollbar-thumb:hover {
  background-color: var(--gray-400);
}
.dark-theme ::-webkit-scrollbar-thumb {
  background-color: var(--gray-600);
  border-color: var(--bg-dark);
}
.dark-theme ::-webkit-scrollbar-thumb:hover {
  background-color: var(--gray-500);
}

/* Selection Style */
::selection {
  background-color: hsla(var(--primary-hue), 70%, 60%, 0.2);
  color: var(--text-dark);
}
.dark-theme ::selection {
  background-color: hsla(var(--primary-hue), 70%, 75%, 0.25);
  color: var(--text-light);
}

/* --- App Layout --- */
.app-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

.main-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-light);
  transition: background-color var(--transition-norm);
  position: relative; /* Needed for overlay */
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar-light);
  border-left: var(--border-light);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  transition: background-color var(--transition-norm), border-color var(--transition-norm), transform var(--transition-norm);
  z-index: 100;
  box-shadow: var(--shadow);
  flex-shrink: 0;
  position: relative; /* For close button positioning */
}

.logo-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding: 0 0.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  object-fit: contain; /* Or 'cover' depending on logo */
  border-radius: var(--border-radius-sm);
}

.logo-text {
  font-family: var(--font-secondary);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  /* Optional Gradient */
  /* background: linear-gradient(45deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; */
}

.sidebar-close-btn {
  display: none; /* Hidden by default, shown via JS */
  background: none;
  border: none;
  color: var(--text-muted-light);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--border-radius-circle);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}
.sidebar-close-btn:hover {
  color: var(--text-dark);
  background-color: var(--gray-100);
}
.dark-theme .sidebar-close-btn:hover {
  color: var(--text-light);
  background-color: var(--gray-700);
}

.sidebar-nav {
  flex-grow: 1;
  overflow-y: auto;
  padding: 0 0.25rem; /* Space for scrollbar */
  margin-bottom: 1rem;
}

.nav-section {
  margin-bottom: 0.75rem;
}

.section-header, .nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
  border: none;
  background: none;
  text-align: right;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted-light);
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}
.section-header i:first-child, .nav-link i:first-child {
   margin-left: 0.75rem;
   width: 1.2em; /* Ensure consistent icon spacing */
   text-align: center;
   color: var(--gray-500);
   transition: color var(--transition-fast);
}
.section-header:hover, .nav-link:hover {
  background-color: var(--primary-ultra-light);
  color: var(--text-primary);
}
.section-header:hover i, .nav-link:hover i {
  color: var(--text-primary);
}
.dark-theme .section-header:hover, .dark-theme .nav-link:hover {
  background-color: var(--gray-700);
  color: var(--primary-light);
}
.dark-theme .section-header:hover i, .dark-theme .nav-link:hover i {
   color: var(--primary-light);
}

.collapse-icon {
  font-size: 0.8rem;
  transition: transform var(--transition-norm);
}
.section-header[aria-expanded="false"] .collapse-icon {
  transform: rotate(-90deg);
}

.section-content {
  padding: 0.75rem 1rem 0;
  overflow: hidden;
  max-height: 500px; /* Adjust as needed */
  opacity: 1;
  transition: max-height var(--transition-slow), opacity var(--transition-norm), padding var(--transition-slow);
}
.section-content[hidden] {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
  margin-top: -0.75rem; /* Collapse margin */
}

.setting-item {
  margin-bottom: 1.25rem;
}
.setting-item:last-child {
  margin-bottom: 0.5rem; /* Reduced margin for last item */
}
.setting-item label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-muted-light);
}

/* Custom Select */
.custom-select-wrapper {
  position: relative;
}
.setting-control {
  width: 100%;
  padding: 0.65rem 2.5rem 0.65rem 1rem; /* Space for arrow */
  border: var(--border-light);
  border-radius: var(--border-radius-sm);
  background-color: var(--bg-input-light);
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text-dark);
  appearance: none; /* Remove default arrow */
  -webkit-appearance: none;
  -moz-appearance: none;
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: var(--shadow-inset);
}
.setting-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--shadow-focus);
}
.select-arrow {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-500);
  pointer-events: none; /* Allows clicking the select */
}
.dark-theme .setting-control {
   background-color: var(--gray-700);
}

/* Range Slider */
.range-with-value {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.setting-range {
  flex-grow: 1;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background-color: var(--gray-200);
  border-radius: var(--border-radius-pill);
  outline: none;
  cursor: pointer;
  background-image: linear-gradient(var(--primary), var(--primary));
  background-size: 50% 100%; /* Default */
  background-repeat: no-repeat;
  transition: background-color var(--transition-norm);
}
.dark-theme .setting-range {
  background-color: var(--gray-600);
}
.setting-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background-color: var(--primary);
  border-radius: var(--border-radius-circle);
  border: 2px solid var(--bg-sidebar-light);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.dark-theme .setting-range::-webkit-slider-thumb {
  border-color: var(--bg-sidebar-dark);
}
.setting-range::-moz-range-thumb { /* Firefox */
  width: 16px;
  height: 16px;
  background-color: var(--primary);
  border-radius: var(--border-radius-circle);
  border: 2px solid var(--bg-sidebar-light);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.setting-range:hover::-webkit-slider-thumb,
.setting-range:focus::-webkit-slider-thumb {
  transform: scale(1.15);
  box-shadow: var(--shadow-md);
}
.range-value {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-on-primary);
  background-color: var(--primary);
  padding: 0.15rem 0.5rem;
  border-radius: var(--border-radius-sm);
  min-width: 2.5em;
  text-align: center;
  box-shadow: var(--shadow-sm);
}
.setting-info {
  font-size: 0.75rem;
  color: var(--text-muted-light);
  margin-top: 0.3rem;
}

.placeholder-text {
  font-size: 0.9rem;
  color: var(--text-muted-light);
  text-align: center;
  padding: 1rem 0;
}

.sidebar-footer {
  border-top: var(--border-light);
  padding: 1rem 0.5rem 0;
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
}

.footer-btn {
  flex: 1;
  padding: 0.65rem 0.75rem;
  border-radius: var(--border-radius);
  border: var(--border-light);
  background-color: transparent;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: var(--text-muted-light);
  transition: all var(--transition-fast);
}
.footer-btn:hover {
  background-color: var(--gray-100);
  border-color: var(--gray-300);
  color: var(--text-dark);
}
.footer-btn i {
  font-size: 1rem;
}
.dark-theme .footer-btn {
  border-color: var(--gray-700);
}
.dark-theme .footer-btn:hover {
  background-color: var(--gray-700);
  border-color: var(--gray-600);
  color: var(--text-light);
}

/* --- Chat Header --- */
.chat-header {
  height: var(--header-height);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-header-light);
  color: var(--text-on-primary);
  flex-shrink: 0;
  box-shadow: var(--shadow);
  z-index: 10;
  position: relative;
  transition: background var(--transition-norm);
}

.chat-title {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.model-avatar-wrapper {
  position: relative;
}
.model-avatar {
  width: 42px;
  height: 42px;
  border-radius: var(--border-radius-circle);
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.3);
  background-color: rgba(255, 255, 255, 0.2); /* Fallback */
  box-shadow: var(--shadow-sm);
}
.status-dot {
  position: absolute;
  bottom: 1px;
  right: 1px;
  width: 10px;
  height: 10px;
  border-radius: var(--border-radius-circle);
  background-color: var(--gray-400); /* Default: offline */
  border: 2px solid var(--bg-input-light); /* Match header bg */
  transition: background-color var(--transition-norm);
}
.status-dot.online {
  background-color: var(--success);
}
.dark-theme .status-dot {
   border-color: var(--bg-input-dark);
}

.title-info {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
#modelNameHeader {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0;
}
.model-status {
  font-size: 0.75rem;
  opacity: 0.8;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.header-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--border-radius-circle);
  border: none;
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--text-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  font-size: 1.1rem;
}
.header-btn:hover {
  background-color: rgba(255, 255, 255, 0.25);
  transform: scale(1.05);
}
.header-btn.active, /* For toggles like web search */
#webSearchToggle.active {
  background-color: rgba(255, 255, 255, 0.3);
  box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
}

/* --- Chat Area --- */
.chat-container {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-area {
  flex-grow: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem; /* Spacing between messages */
}

/* --- Welcome Message --- */
.welcome-container {
  padding: 2rem 1.5rem;
  margin: 1rem auto; /* Center horizontally */
  max-width: 800px; /* Limit width */
  background-color: var(--bg-input-light);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  border: var(--border-light);
  animation: fadeInScaleUp 0.5s var(--transition-bounce) forwards;
  opacity: 0;
  transform: scale(0.95);
}
.dark-theme .welcome-container {
   background-color: var(--bg-input-dark);
}

@keyframes fadeInScaleUp {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.welcome-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  justify-content: center;
  text-align: center;
}
.welcome-icon {
  width: 50px;
  height: 50px;
  object-fit: contain;
  border-radius: var(--border-radius);
}
.welcome-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}
.welcome-text {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 1.05rem;
  color: var(--text-muted-light);
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}
.capability-card {
  background-color: var(--primary-ultra-light);
  padding: 1.25rem 1rem;
  border-radius: var(--border-radius);
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border: 1px solid transparent;
}
.dark-theme .capability-card {
   background-color: var(--gray-800);
}
.capability-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}
.card-icon {
  font-size: 1.75rem;
  color: var(--primary);
  margin-bottom: 0.75rem;
  display: block;
}
.capability-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.3rem 0;
  color: var(--text-dark);
}
.dark-theme .capability-card h3 {
   color: var(--text-light);
}
.capability-card p {
  font-size: 0.85rem;
  color: var(--text-muted-light);
  margin: 0;
  line-height: 1.5;
}

.prompt-suggestions {
  margin-top: 1.5rem;
  text-align: center;
}
.prompt-suggestions h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted-light);
  margin-bottom: 1rem;
}
.suggestions-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}
.suggestion-chip {
  background-color: var(--gray-100);
  border: var(--border-light);
  border-radius: var(--border-radius-pill);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--text-muted-light);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.dark-theme .suggestion-chip {
   background-color: var(--gray-700);
   border-color: var(--gray-600);
}
.suggestion-chip:hover {
  background-color: var(--primary-ultra-light);
  border-color: var(--primary-light);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.dark-theme .suggestion-chip:hover {
   background-color: var(--gray-600);
   border-color: var(--primary);
}
.suggestion-chip i {
  font-size: 0.8rem;
}

/* --- Messages --- */
.message {
  display: flex;
  max-width: 75%;
  margin-bottom: 0.5rem; /* Space below each message block */
  opacity: 0; /* Start hidden for animation */
  transform: translateY(10px);
  animation: messageFadeIn 0.4s ease-out forwards;
}

@keyframes messageFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-content {
  padding: 0.8rem 1.2rem;
  border-radius: var(--bubble-radius);
  position: relative;
  line-height: var(--line-height-base);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast);
}
.message-content:hover {
    box-shadow: var(--shadow);
}

.message-time {
  font-size: 0.7rem;
  opacity: 0.6;
  display: block;
  margin-top: 0.5rem;
  text-align: left; /* Consistent time alignment */
}

/* User Message */
.user-message {
  align-self: flex-end;
  margin-left: auto; /* Push to right */
}
.user-message .message-content {
  background: var(--user-bubble-bg);
  color: var(--user-bubble-text);
  border-bottom-right-radius: 5px; /* Tail effect */
}
.user-message .message-time {
   color: hsla(0, 0%, 100%, 0.7);
}

/* Bot Message */
.bot-message {
  align-self: flex-start;
  margin-right: auto; /* Push to left */
}
.bot-message .message-content {
  background-color: var(--bot-bubble-bg-light);
  color: var(--bot-bubble-text-light);
  border-bottom-left-radius: 5px; /* Tail effect */
}
.dark-theme .bot-message .message-content {
   background-color: var(--bot-bubble-bg-dark);
   color: var(--bot-bubble-text-dark);
}
.bot-message .message-time {
   color: var(--text-muted-light); /* Matches general muted text */
}

/* Message Content Styling (Markdown, Code etc.) */
.message-content p:last-child {
  margin-bottom: 0; /* Remove extra margin below last paragraph */
}
.message-content strong {
  font-weight: 600;
}
.message-content a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid hsla(var(--primary-hue), 70%, 60%, 0.3);
  transition: border-color var(--transition-fast);
}
.message-content a:hover {
  border-bottom-color: var(--primary);
}
.dark-theme .message-content a {
   color: var(--primary-light);
   border-bottom-color: hsla(var(--primary-hue), 70%, 75%, 0.3);
}
.dark-theme .message-content a:hover {
   border-bottom-color: var(--primary-light);
}

/* Code Blocks */
.message-content pre {
  background-color: var(--gray-800) !important; /* Override Prism */
  color: var(--gray-100) !important;
  border-radius: var(--border-radius-sm);
  padding: 1rem !important;
  margin: 1rem 0;
  overflow-x: auto;
  font-family: 'Courier New', Courier, monospace; /* Consistent mono font */
  font-size: 0.9em;
  position: relative; /* For copy button */
  box-shadow: var(--shadow-inset);
}
.message-content pre code {
  background: none !important;
  color: inherit !important;
  font-size: inherit !important;
  padding: 0 !important;
  text-shadow: none !important;
}
.dark-theme .message-content pre {
    background-color: var(--gray-900) !important;
    color: var(--gray-200) !important;
}

/* Copy Code Button */
.copy-code-btn {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem; /* RTL positioning */
  background-color: var(--gray-600);
  color: var(--gray-100);
  border: none;
  border-radius: var(--border-radius-sm);
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  cursor: pointer;
  opacity: 0; /* Hidden by default */
  transition: opacity var(--transition-fast), background-color var(--transition-fast);
}
.message-content pre:hover .copy-code-btn {
  opacity: 1; /* Show on hover */
}
.copy-code-btn:hover {
  background-color: var(--gray-500);
}
.copy-code-btn.copied {
  background-color: var(--success);
  color: white;
}
.copy-code-btn.copied i {
   margin-left: 0.3rem;
}

/* Inline Code */
.message-content code:not(pre > code) {
  background-color: var(--gray-200);
  color: var(--accent-dark);
  padding: 0.15em 0.4em;
  border-radius: var(--border-radius-sm);
  font-size: 0.9em;
}
.dark-theme .message-content code:not(pre > code) {
  background-color: var(--gray-600);
  color: var(--accent-light);
}

/* Lists */
.message-content ul, .message-content ol {
  padding-right: 1.5rem; /* RTL padding */
  margin: 0.75rem 0;
}
.message-content li {
  margin-bottom: 0.3rem;
}

/* Blockquotes */
.message-content blockquote {
  border-right: 3px solid var(--primary-light); /* RTL border */
  padding-right: 1rem;
  margin: 1rem 0;
  color: var(--text-muted-light);
  font-style: italic;
}
.dark-theme .message-content blockquote {
   border-right-color: var(--primary);
}

/* Tables */
.message-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9em;
  box-shadow: var(--shadow-sm);
  border-radius: var(--border-radius-sm);
  overflow: hidden; /* Ensure radius applies to borders */
}
.message-content th, .message-content td {
  border: var(--border-light);
  padding: 0.6rem 0.8rem;
  text-align: right;
}
.message-content th {
  background-color: var(--gray-100);
  font-weight: 600;
}
.dark-theme .message-content th {
  background-color: var(--gray-700);
}
.message-content tr:nth-child(even) {
  background-color: var(--primary-ultra-light);
}
.dark-theme .message-content tr:nth-child(even) {
  background-color: hsla(var(--primary-hue), 10%, 30%, 0.2); /* Subtle dark row */
}

/* --- Typing Indicator --- */
.typing-indicator {
  display: flex; /* Use flex on the outer message container */
  align-items: center;
  padding: 0.8rem 1.2rem; /* Match message padding */
  background-color: var(--bot-bubble-bg-light);
  border-radius: var(--bubble-radius);
  border-bottom-left-radius: 5px; /* Tail effect */
  box-shadow: var(--shadow-sm);
}
.dark-theme .typing-indicator {
  background-color: var(--bot-bubble-bg-dark);
}
.typing-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--border-radius-circle);
  background-color: var(--gray-400);
  margin: 0 3px;
  animation: typingBounce 1.4s infinite ease-in-out;
}
.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }
.typing-dot:nth-child(3) { animation-delay: 0s; }

@keyframes typingBounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1.0); }
}

/* --- Input Area --- */
.input-container {
  padding: 1rem 1.5rem 1.25rem;
  background-color: var(--bg-input-light);
  border-top: var(--border-light);
  transition: background-color var(--transition-norm), border-color var(--transition-norm);
  z-index: 5;
  box-shadow: 0 -3px 10px rgba(0, 0, 0, 0.03);
}
.dark-theme .input-container {
  box-shadow: 0 -3px 10px rgba(0, 0, 0, 0.1);
}

/* Image Preview */
.image-preview-container {
  margin-bottom: 0.75rem;
  position: relative;
  width: fit-content; /* Size to image */
  max-width: 150px; /* Limit preview size */
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow);
  animation: fadeInScaleUp 0.3s ease-out; /* Reuse animation */
}
.preview-image {
  display: block;
  width: 100%;
  height: auto;
}
.remove-image-btn {
  position: absolute;
  top: 5px;
  right: 5px; /* RTL position */
  background-color: rgba(0, 0, 0, 0.6);
  color: white;
  border: none;
  border-radius: var(--border-radius-circle);
  width: 24px;
  height: 24px;
  font-size: 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
}
.remove-image-btn:hover {
  background-color: rgba(0, 0, 0, 0.8);
}

.input-area {
  display: flex;
  position: relative;
  background-color: var(--bg-input-light); /* Match container */
  border: var(--border-light);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  overflow: hidden; /* Clip buttons */
}
.input-area:focus-within {
  border-color: var(--primary);
  box-shadow: var(--shadow-focus);
}
.dark-theme .input-area {
   background-color: var(--gray-700); /* Slightly different for contrast */
}

#userInput {
  flex-grow: 1;
  padding: 0.9rem 1rem;
  padding-left: 7rem; /* Space for buttons */
  border: none;
  background: none;
  resize: none;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-dark);
  min-height: 54px; /* Consistent height */
  max-height: 150px; /* Limit expansion */
  overflow-y: auto;
  line-height: 1.5;
}
#userInput:focus {
  outline: none;
}
#userInput::placeholder {
  color: var(--text-muted-light);
  opacity: 0.8;
}

.input-buttons {
  position: absolute;
  left: 0.5rem; /* RTL position */
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  gap: 0.3rem; /* Small gap between buttons */
}
.action-btn {
  background: none;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: var(--border-radius-circle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 1.1rem;
  cursor: pointer;
  transition: color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}
.action-btn:hover {
  color: var(--primary);
  background-color: var(--primary-ultra-light);
}
.dark-theme .action-btn:hover {
  color: var(--primary-light);
  background-color: var(--gray-600);
}
.action-btn:disabled {
   opacity: 0.5;
   cursor: not-allowed;
   background-color: transparent !important;
}
.send-btn {
  background-color: var(--primary);
  color: var(--text-on-primary);
}
.send-btn:hover {
  background-color: var(--primary-dark);
  color: var(--text-on-primary); /* Ensure color stays */
  transform: scale(1.05);
}
.send-btn:disabled {
   background-color: var(--gray-300) !important;
   color: var(--gray-500) !important;
   transform: none !important;
}
.dark-theme .send-btn {
  background-color: var(--primary);
}
.dark-theme .send-btn:hover {
  background-color: var(--primary-light);
}
.dark-theme .send-btn:disabled {
   background-color: var(--gray-600) !important;
   color: var(--gray-400) !important;
}

/* Voice Input Specific */
.voice-btn.recording {
  background-color: var(--accent);
  color: white;
  animation: pulseAnimation 1.5s infinite;
}
.voice-btn.recording:hover {
   background-color: var(--accent-dark);
   color: white;
}

@keyframes pulseAnimation {
  0% { box-shadow: 0 0 0 0 rgba(var(--accent-hue), 100%, 65%, 0.5); }
  70% { box-shadow: 0 0 0 8px rgba(var(--accent-hue), 100%, 65%, 0); }
  100% { box-shadow: 0 0 0 0 rgba(var(--accent-hue), 100%, 65%, 0); }
}

/* --- Loading Indicator --- */
.loading-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted-light);
  animation: fadeIn 0.3s ease-out;
}
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--primary-light);
  border-top-color: var(--primary);
  border-radius: var(--border-radius-circle);
  animation: spin 1s linear infinite;
}
.dark-theme .spinner {
   border-color: var(--primary);
   border-top-color: var(--primary-light);
}

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

/* --- Utility Classes --- */
.mobile-only { display: none !important; } /* Hide on desktop */
.desktop-only { display: block !important; } /* Show on desktop */

/* --- Toast Notification (for copy/export) --- */
.toast-notification {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: hsla(var(--gray-900), 0.9);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-pill);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  z-index: 1001;
  opacity: 0;
  transition: opacity var(--transition-norm), transform var(--transition-norm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.toast-notification.show {
  opacity: 1;
  transform: translateX(-50%) translateY(-10px);
}
.toast-notification i {
  color: var(--success); /* Or dynamic based on type */
}

/* --- Mobile Responsiveness --- */
@media (max-width: 992px) {
  :root {
    --sidebar-width: 280px;
  }
  .message { max-width: 85%; }
  .capabilities-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
}

@media (max-width: 768px) {
  .mobile-only { display: flex !important; } /* Show mobile buttons */
  .desktop-only { display: none !important; }

  .sidebar {
    position: fixed;
    top: 0;
    right: 0;
    height: 100%;
    transform: translateX(100%);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-slow), background-color var(--transition-norm), border-color var(--transition-norm);
    /* Add backdrop blur for iOS */
    /* -webkit-backdrop-filter: blur(10px); */
    /* backdrop-filter: blur(10px); */
  }
  .sidebar.open {
    transform: translateX(0);
  }

  .overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
  }
  .overlay.show {
    opacity: 1;
    visibility: visible;
  }

  .main-content {
    /* Optional: Slightly shift content when sidebar opens */
    /* transition: transform var(--transition-slow); */
  }
  /* body.sidebar-open .main-content {
     transform: translateX(calc(-1 * var(--sidebar-width) / 2)); // Example shift
  } */

  .chat-header { padding: 0 1rem; }
  .chat-area { padding: 1rem; }
  .input-container { padding: 0.75rem 1rem 1rem; }
  .message { max-width: 90%; }
  #modelNameHeader { font-size: 1.15rem; }
  .model-avatar { width: 36px; height: 36px; }
  .status-dot { width: 8px; height: 8px; bottom: 0; right: 0; border-width: 1.5px;}
  .header-btn { width: 34px; height: 34px; font-size: 1rem; }
  #userInput { padding-left: 6.5rem; min-height: 50px; }
  .action-btn { width: 34px; height: 34px; font-size: 1rem; }

  .welcome-container { max-width: 95%; padding: 1.5rem 1rem; }
  .welcome-header h2 { font-size: 1.5rem; }
  .capabilities-grid { grid-template-columns: 1fr 1fr; } /* 2 columns on medium screens */
  .suggestion-chip { font-size: 0.8rem; padding: 0.4rem 0.8rem;}
}

@media (max-width: 576px) {
  :root {
     /* Adjust sidebar width for small screens if needed */
     /* --sidebar-width: 260px; */
  }
  .capabilities-grid { grid-template-columns: 1fr; } /* 1 column on small screens */
  .chat-title { gap: 0.75rem; }
  #modelNameHeader { font-size: 1.05rem; }
  .header-actions { gap: 0.25rem; }
  .suggestions-list { gap: 0.5rem; }
}

/* --- Fade Out Animation --- */
.fade-out {
  opacity: 0 !important;
  transform: scale(0.9) !important;
  transition: opacity 0.3s ease-out, transform 0.3s ease-out !important;
}