:root {
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-bg-glass: rgba(255, 255, 255, 0.8);
  --color-bg-glass-dark: rgba(0, 0, 0, 0.05);

  --color-surface-dark: #f8fafc;
  --color-text-primary: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-text-accent: #00c6ff;
  --color-border-hover: rgba(0, 198, 255, 0.3);
  --color-bg: #ffffff,
  --color-bg-glass: rgba(255,255,255,0.9);
  --color-surface: #f8f9fa;
  --color-text: #212529;
  --color-text-muted: #6c757d;
  --color-border: #dee2e6;

  --gradient-primary: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%);        
  --gradient-secondary: linear-gradient(135deg, #f7971e 0%, #ffd200 100%);     
  --gradient-accent: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);        
  --gradient-error: linear-gradient(135deg, #d31027 0%, #ea384d 100%);
  --gradient-dark: linear-gradient(135deg, #0f2027 0%, #203a43 50%, #2c5364 100%);
  --gradient-ai: linear-gradient(135deg, #00F5A0 0%, #00D9F5 50%, #0061FF 100%);
  --gradient-user: linear-gradient(135deg, #ff512f 0%, #f09819 50%, #ffb75e 100%);

  --gradient-user-bubble: linear-gradient(135deg, #f7bb4d, #d86827);
  --gradient-assistant-bubble: linear-gradient(135deg, #42c7f4fd, #1ed3bb);
  --gradient-input: linear-gradient(135deg, #eef2f3 0%, #dfe9f3 100%);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px rgba(20, 184, 166, 0.3);

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2rem;
  --spacing-3xl: 2.5rem;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.7rem;
  --font-size-sm: 0.8rem;
  --font-size-base: 0.9rem;
  --font-size-lg: 1rem;
  --font-size-xl: 1.1rem;
  --font-size-2xl: 1.3rem;
  --font-size-3xl: 1.6rem;
  --font-size-4xl: 1.9rem;

  --sidebar-width: 280px;
  --header-height: 64px;
  --input-height: 120px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
}

*,
*::before,
*::after { 
  box-sizing: border-box; 
  margin: 0;
  padding: 0;
}

html { 
  font-size: 16px; 
  scroll-behavior: smooth; 
  height: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: #ffffff;
  background: linear-gradient( 270deg, #f5fad5, #c5eff5);
  height:100%;
  overflow: visible;
  overflow-y: auto;
  scroll-behavior: smooth; 
  position: relative;
}

@keyframes backgroundShift {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.1) rotate(1deg); }
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: transparent;
  border-radius: 4px;
  transition: var(--transition-normal);
}

   @keyframes glow {
    0%, 100% { box-shadow: 0 0 5px rgba(139, 92, 246, 0.3); }
    50% { box-shadow: 0 0 20px rgba(139, 92, 246, 0.6); }
  }
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes hoverPop {
  0% { transform: scale(1); }
  60% { transform: scale(1.08); }
  100% { transform: scale(1.06); }
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

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

@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transform: translate3d(0,0,0);
  }
  40%, 43% {
    transform: translate3d(0, -30px, 0);
  }
  70% {
    transform: translate3d(0, -15px, 0);
  }
  90% {
    transform: translate3d(0, -4px, 0);
  }
}

.sidebar {
  width: var(--sidebar-width);
  height:100%;
  overflow-y:auto;
  background: rgba(240, 234, 234, 0.596);
  backdrop-filter: blur(20px);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  position: fixed;
  left: 0;
  top: 0;
  z-index: var(--z-fixed);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition-normal) var(--transition-bounce);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  color:#0b1220;
  border-right: 2px solid rgba(255, 255, 255, 0.1);
}

.sidebar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.sidebar.show {
  transform: translateX(0);
}

@media (max-width: 768px) {
  .sidebar.show::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
  }

  .sidebar {
    width: 85vw;
    max-width: 320px;
  }

  .sidebar {
    touch-action: pan-y;
  }
}

.sidebar-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(135deg, #f5576c,#f093fb);
  position: relative;
  overflow: hidden;
  color:white;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.sidebar-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, rgba(255,255,255,0), rgba(255,255,255,0.08), rgba(255,255,255,0));
  opacity: 0.5;
  animation: shimmer 4s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: white;
  margin-bottom: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.logo i {
  font-size: var(--font-size-2xl);
  background: linear-gradient(135deg, #00F5A0 0%, #00D9F5 50%, #0061FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: logoGlow 2s ease-in-out infinite alternate;
}

@keyframes logoGlow {
  from { filter: drop-shadow(0 0 6px rgba(20, 184, 166, 0.5)); }
  to { filter: drop-shadow(0 0 16px rgba(0, 114, 255, 0.8)); }
}

.new-chat-btn {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.new-chat-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.new-chat-btn:hover::before {
  left: 100%;
}

.new-chat-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.chat-history {
  flex: 1;
  overflow-y: auto;
  background-color: #ffffff04;
  padding: var(--spacing-md);
}

.chat-history-item {
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-xl);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  transform: translateX(0);
  backdrop-filter: blur(15px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.chat-history-item::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left var(--transition-slow);
}

.chat-history-item:hover::after {
  left: 100%;
}

.chat-history-item:hover {
  opacity: 1;
  transform: scale(1);
}

.chat-history-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--gradient-primary);
  transform: scaleY(0);
  transition: transform var(--transition-normal);
}

.chat-history-item:hover {
  background-color: #5fa4b574;
  border-color: rgba(0, 198, 255, 0.2);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.chat-history-item:hover::before {
  transform: scaleY(1);
}

.chat-history-item:hover .chat-item-title {
  color: var(--color-text-accent);
}

.chat-history-item:hover .chat-item-preview {
  color: var(--color-text-primary);
}

.chat-history-item.active {
  background:var(--gradient-primary);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
  transform: translateX(4px) scale(1.02);
  color: white;
}

.chat-history-item.active::before {
  transform: scaleY(1);
  background: var(--color-text-accent);
}

.chat-history-item.active::after {
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.chat-history-item.active .chat-item-title {
  color: white;
  font-weight: 700;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.chat-history-item.active .chat-item-preview {
  color: rgba(255, 255, 255, 0.9);
}

.chat-history-item.active .chat-item-meta {
  color: rgba(255, 255, 255, 0.7);
}

.chat-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xs);
}

.chat-item-title {
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: inherit;
}

.chat-item-actions {
  display: flex;
  gap: var(--spacing-xs);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.chat-history-item:hover .chat-item-actions {
  opacity: 1;
}

.chat-item-preview {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.4;
}

.chat-item-meta {
  display: flex;
  justify-content: space-between;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.sidebar-footer {
  padding: var(--spacing-sm);
  border-top: 1px solid var(--color-border);
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.1);
}

.settings-btn,
.profile-btn {
  width: 100%;
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.15);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.settings-btn:hover,
.profile-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.main-content {
  flex: 1;
  margin-left: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  transition: margin-left var(--transition-normal);
}

@media (min-width: 768px) {
  .sidebar {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: var(--sidebar-width);
  }
}

.main-header {
  height: var(--header-height);
  background: linear-gradient(135deg, rgba(32, 58, 67, 0.9), rgba(44, 83, 100, 0.9));
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-lg);
  position: relative;
  z-index: var(--z-sticky);
  box-shadow: var(--shadow-md);
}

.sidebar-toggle {
  border: none;
  border-radius: var(--border-radius);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  cursor: pointer;
  transition: all var(--transition-normal);
  margin-right: var(--spacing-md);
}

.sidebar-toggle:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.header-title {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.header-title h1 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: white;
  margin: 0;
  transition: color var(--transition-normal);
}

.header-title h1.active-chat {
  color: var(--color-text-accent);
  text-shadow: 0 0 10px rgba(20, 184, 166, 0.3);
}

.chat-meta {
  display: flex;
  gap: var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
}

.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
  position: relative;
}

.chat-header {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-glass);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
  align-items: center;
  margin: calc(-1 * var(--spacing-md)) calc(-1 * var(--spacing-md)) var(--spacing-sm) calc(-1 * var(--spacing-md));
}

.current-model-display {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.model-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.model-indicator i {
  font-size: var(--font-size-xs);
  opacity: 0.8;
}

.model-indicator {
  cursor: pointer;
  transition: all var(--transition-normal);
}

.model-indicator:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  background: var(--gradient-primary-hover);
}

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

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

.chat-container::-webkit-scrollbar-thumb {
  background:transparent;
  border-radius: 3px;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  align-items: stretch; 
}

.welcome-message {
  text-align: center;
  max-width: 500px;
  margin: auto;
  padding: var(--spacing-s);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-xl);
  backdrop-filter: blur(20px);
  animation: welcomeSlideIn 0.6s ease-out;
}

@keyframes welcomeSlideIn {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.welcome-message h2 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xl);
  background: linear-gradient(135deg, #66d2ea, #084475);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 30px rgba(102, 126, 234, 0.5);
  letter-spacing: -0.5px;
}

.welcome-message p {
  font-size: var(--font-size-xl);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.7;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 500;
  opacity: 0.9;
}

.quick-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 2fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.quick-action-btn {
  padding:10px;
  background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 50%, #fecfef 100%);
  color: #333;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--border-radius-xl);
  font-size: var(--font-size-sm);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 25px rgba(255, 154, 158, 0.3);
}

.quick-action-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.quick-action-btn:hover::before {
  left: 100%;
}

.quick-action-btn:hover {
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 12px 35px rgba(255, 154, 158, 0.4);
}

.quick-action-btn:active {
  transform: translateY(-1px) scale(0.98);
}

.quick-action-btn i {
  font-size: var(--font-size-2xl);
  color: inherit;
  transition: transform var(--transition-normal);
}

.quick-action-btn:hover i {
  transform: scale(1.1);
}

.input-area {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-border);
  padding: 5px;
  position: relative;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

.input-container {
  max-width: 800px;
  margin: 0 auto;
}

.input-wrapper {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-lg);
  display: flex;
  align-items: flex-end;
  gap: var(--spacing-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(20px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.input-wrapper:focus-within {
  border-color: #4facfe;
  box-shadow: 0 12px 40px rgba(79, 172, 254, 0.3);
  transform: translateY(-2px);
}

#userInput {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  resize: none;
  min-height: 34px;
  max-height: 100px;
  font-family: inherit;
  box-shadow: none;
  cursor: text;
  user-select: text;
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
}

#userInput::selection {
  background: var(--gradient-primary);
  color: white;
}

#userInput::placeholder {
  color: var(--color-text-muted);
}

.input-actions {
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-end;
}

.input-action-btn {
  background: var(--color-bg-glass);
  border: none;
  border-radius: 30px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 200ms ease, filter 200ms ease, background 300ms ease;
  background-size: 200% 200%;
}

.input-action-btn:hover {
  color: white;
  border-color: transparent;
  transform: translateY(-1px) scale(1.08);
  box-shadow: 0 8px 22px rgba(0,0,0,0.18), var(--shadow-glow);
  animation: gradientShift 1.2s ease infinite alternate;
}

.send-btn {
  background: var(--gradient-primary);
  background-size: 100% 100%;
  border: none;
  border-radius: var(--border-radius);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 200ms ease, filter 200ms ease, background 300ms ease;
  background-size: 200% 200%;
  position: relative;
  overflow: hidden;
}

.send-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(22, 48, 100, 0.229);

  transform: translate(-50%, -50%);
  transition: all var(--transition-normal);
}

.send-btn:hover::before {
  width: 100%;
  height: 100%;
}

.send-btn:hover:not(:disabled) {
  transform: translateY(-1px) scale(1.08);
  box-shadow: 0 10px 24px rgba(0,0,0,0.2), var(--shadow-glow);
  animation: gradientShift 1.2s ease infinite alternate;
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.input-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.char-counter {
  font-weight: 600;
  color: #f6f9fc;

  font-size: var(--font-size-xs);
  transition: all var(--transition-normal);

}

.char-counter.warning {
  color: #f59e0b;
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.3);
}

.char-counter.danger {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
}

.btn, .action-btn, .input-action-btn {
  position: relative;
  overflow: hidden;
}

.btn::before, .action-btn::before, .input-action-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.3s ease;
}

.btn:hover::before, .action-btn:hover::before, .input-action-btn:hover::before {
  width: 100%;
  height: 100%;
}

.chat-history-item, .quick-action-btn {
  position: relative;
  overflow: hidden;
}

.chat-history-item::after, .quick-action-btn::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
  transition: left 0.5s ease;
}

.chat-history-item:hover::after, .quick-action-btn:hover::after {
  left: 100%;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  box-shadow: 0 0 0 2px rgba(0, 198, 255, 0.3);
  animation: pulse 0.3s ease;

}

select option:disabled {
  color: var(--color-text-muted);
  font-style: italic;
  background-color: var(--color-bg-tertiary);
}

.message {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  animation: messageSlideIn 0.4s ease-out;
  position: relative;
  padding: 0 var(--spacing-lg); 
  animation: slideIn .3s var(--transition) forwards;
}
@keyframes slideIn{
  from{opacity:0;transform:translateY(12px);}
  to{opacity:1;transform:translateY(0);}
}
.message:hover {
  transition: all var(--transition-normal);
  transform: translateX(5px) scale(1.012);
}

.user-message {
  display: flex;
  flex-direction: row-reverse;
  align-items: flex-start;
  justify-content: flex-end;
  gap: var(--spacing-md);
  max-width: 100%;
  padding: 0 var(--spacing-lg); 
  background: transparent;
  margin-left: auto;  
  margin-right: 0;
}

.ai-message {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  justify-content: flex-start;
  gap: var(--spacing-md);
  max-width: 100%;
  padding: 0 var(--spacing-lg); 
  margin-right: auto; 
  margin-left: 0;
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes chatSwitch {
  from {
    opacity: 0.8;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.chat-container.switching {
  animation: chatSwitch 0.3s ease-out;
}

.ai-message {

  border: none;
  border-radius: var(--border-radius-lg);
  box-shadow: none;
}

.ai-message .content {
  background: var(--gradient-assistant-bubble);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-lg) var(--spacing-xl);
  padding-block: clamp(12px, 1.5vh, 20px);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(15px);
  text-align: left;
  font-style: normal;
  color: #ffffff;
  max-width: 720px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.ai-message.streaming .content {
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  animation: streamingPulse 2s ease-in-out infinite;
}

.ai-message .content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.ai-message .content pre,
.user-message .content pre {
  background: #0b1220;
  color: #e5e7eb;
  border-radius: 10px;
  padding: 13px 14px;
  overflow: auto;
  border: 1px solid rgba(255,255,255,0.08);
}

.ai-message .content code,
.user-message .content code {
  background: rgba(0,0,0,0.2);
  padding: 4px 6px;
  border-radius: 6px;
}

.ai-message .content em,
.ai-message .content i {
  font-style: normal !important;
}

.user-message {
  background: transparent;
  box-shadow: none;
}

.user-message .content {
  background: var(--gradient-user-bubble);
  color: white;
  padding: var(--spacing-lg) var(--spacing-xl);
  padding-block: clamp(12px, 1.5vh, 20px);
  border-radius: var(--border-radius-xl);
  max-width: 720px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.user-message .content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

@keyframes shimmerEffect {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  color: white;
  position: relative;
  flex-shrink: 0;
}

.ai-message .avatar {
  background: var(--gradient-ai);
  animation: avatarPulse 3s ease-in-out infinite;
  box-shadow: var(--shadow-glow);
  border: 2px solid rgba(255, 255, 255, 0.2);
}

@keyframes avatarPulse {
  0%, 100% { 
    transform: scale(1);
    box-shadow: 0 0 10px rgba(0, 245, 160, 0.3);
  }
  50% { 
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(0, 217, 245, 0.5);
  }
}

.user-message .avatar {
  background: var(--gradient-user);
  box-shadow: var(--shadow-md);
  border: 2px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-normal);
}

.user-message .avatar:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.user-message .avatar {
  background: var(--gradient-user);
}

.content-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.content {
  line-height: 1.6;
  color: var(--color-text-primary);
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
}

.message-metadata {
  display: flex;
  gap: var(--spacing-lg);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-sm);
}

.message-actions {
  display: grid;
  grid-template-columns: repeat(3, 32px);
  grid-auto-rows: 32px;
  gap: 4px;
  opacity: 0;
  transition: opacity var(--transition-normal);
  justify-content: end;
  justify-items: end;
  align-content: end;
  align-items: end;
}

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

.message.long .message-actions {
  grid-template-columns: repeat(2, 32px);
  grid-auto-rows: 32px;
  justify-content: end;
  align-content: end;
  right: -10px;
}

.action-btn {
  background: transparent;
  border-radius:30px;
  width: 32px;
  height: 32px;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 200ms ease, filter 200ms ease, background 300ms ease;
  background-size: 200% 200%;
  font-size: var(--font-size-sm);
}

.header-actions .action-btn {
  width: 36px;
  height: 36px;
}

.action-btn:hover {
  color: white;
  border-color: transparent;
  transform: translateY(-1px) scale(1.08);
  box-shadow: 0 8px 22px rgba(0,0,0,0.18), var(--shadow-glow);
  animation: gradientShift 1.2s ease infinite alternate;
}

#attachFileBtn {
  background: linear-gradient(135deg, #f54ea2 0%, #ff7676 100%);
  border: none;
}
#attachFileBtn:hover { background: linear-gradient(135deg, #ff6a88 0%, #ff99ac 100%); }

#voiceBtn {
  background: linear-gradient(135deg, #2193b0 0%, #6dd5ed 100%);
  border: none;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

#voiceBtn:hover { 
  background: linear-gradient(135deg, #1c92d2 0%, #f2fcfe 100%); 
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

#voiceBtn.listening {
  background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
  color: white;
  animation: voiceListeningPulse 1.2s ease-in-out infinite;
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(255, 107, 107, 0.4);
}

#voiceBtn.listening::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255, 107, 107, 0.3) 0%, transparent 70%);
  transform: translate(-50%, -50%);
  animation: voiceRipple 2s ease-out infinite;
  border-radius: 50%;
}

#voiceBtn.listening #voiceIcon {
  animation: voiceIconBounce 0.6s ease-in-out infinite;
}

@keyframes voiceListeningPulse {
  0%, 100% { 
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 107, 107, 0.4);
  }
  50% { 
    transform: scale(1.1);
    box-shadow: 0 0 30px rgba(255, 107, 107, 0.6);
  }
}

@keyframes voiceRipple {
  0% {
    transform: translate(-50%, -50%) scale(0);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scale(2);
    opacity: 0;
  }
}

@keyframes voiceIconBounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.2); }
}

#voiceBtn:disabled {
  background: linear-gradient(135deg, #94a3b8 0%, #64748b 100%);
  cursor: not-allowed;
  opacity: 0.6;
}

#voiceBtn:disabled:hover {
  transform: none;
  box-shadow: none;
}

#voiceBtn.error {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  animation: voiceErrorShake 0.5s ease-in-out;
}

@keyframes voiceErrorShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

#sendBtn {
  background: linear-gradient(135deg, #0bab64 0%, #3bb78f 100%);
  border: none;
}
#sendBtn:hover { background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%); }

#clearChatBtn { background: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%); border: none; }
#exportChatBtn { background: linear-gradient(135deg, #f2994a 0%, #f2c94c 100%); border: none; }
#shareChatBtn { background: linear-gradient(135deg, #00c6ff 0%, #0072ff 100%); border: none; }

#clearChatBtn:hover { background: linear-gradient(135deg, #ff758c 0%, #ff7eb3 100%); }
#exportChatBtn:hover { background: linear-gradient(135deg, #f6d365 0%, #fda085 100%); }
#shareChatBtn:hover { background: linear-gradient(135deg, #8ec5fc 0%, #e0c3fc 100%); }

.chat-history-item .delete-btn{
  background: linear-gradient(135deg, #d23d4f 0%, #7e1606 100%); border: none;
  border-radius:30px;
  width: 32px;
  height: 32px;
  border: none;
  color: white;
  cursor: pointer;

  margin-left: auto;
  margin-right: 0;

  font-size: var(--font-size-sm);
  border-color: transparent;

  box-shadow: 0 8px 22px rgba(0,0,0,0.18), var(--shadow-glow);
  animation: gradientShift 1.2s ease infinite alternate;
}
.chat-history-item .delete-btn:hover {
  transform: scale(1);
  transition: transform var(--transition-normal);
  cursor: pointer;
  border-color: transparent;
  transform: translateY(-1px) scale(1.08);
  box-shadow: 0 8px 22px rgba(0,0,0,0.18), var(--shadow-glow);
  animation: gradientShift 1.2s ease infinite alternate;
}

.message .action-btn.copy-btn { background: linear-gradient(135deg, #06beb6 0%, #48b1bf 100%); border: none; }
.message .action-btn.delete-btn { background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%); border: none; }
.message .action-btn.edit-btn { background: linear-gradient(135deg, #f2994a 0%, #f2c94c 100%); border: none; }
.message .action-btn.speak-btn { background: linear-gradient(135deg, #7F7FD5 0%, #91EAE4 100%); border: none; }
.message .action-btn.speak-btn.speaking { 
  background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%); 
  animation: pulse 1s ease-in-out infinite;
}
.message .action-btn.regenerate-btn { background: linear-gradient(135deg, #4b6cb7 0%, #182848 100%); border: none; }
.message .action-btn.feedback-good { background: linear-gradient(135deg, #2b8a3e 0%, #7bc96f 100%); border: none; }
.message .action-btn.feedback-bad { background: linear-gradient(135deg, #d31027 0%, #ea384d 100%); border: none; }

.message .action-btn:hover { filter: brightness(1.02); }

.action-btn i, .input-action-btn i, .send-btn i { color: #fff; }

.typing-indicator{
  display:flex; gap:.3rem; align-items:center;
}
.typing-indicator span{
  width:.6rem; height:.6rem;
  border-radius:50%; opacity:.5;
  animation:bounce 1.4s infinite, glowDot 1.8s ease-in-out infinite;
}
.typing-indicator span:nth-child(2){animation-delay:.2s;}
.typing-indicator span:nth-child(3){animation-delay:.4s;}
@keyframes bounce{
  0%,80%,100%{transform:scale(.6);opacity:.5;}
  40%{transform:scale(1);opacity:1;}
}

@keyframes glowDot {
  0%, 100% { box-shadow: 0 0 6px rgba(20, 184, 166, 0.4); }
  50% { box-shadow: 0 0 16px rgba(0, 114, 255, 0.6); }
}

.typing-dots {
  display: flex;
  gap: var(--spacing-xs);
  justify-content: center;
}

.typing-dots span {
  width: 8px;
  height: 8px;
  background: var(--gradient-primary);
  border-radius: 50%;
  animation: bounce 1.4s ease-in-out infinite;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }
.typing-dots span:nth-child(3) { animation-delay: 0s; }

.message.streaming {
  
}

.message.completed {
  animation: completionGlow 0.5s ease-out;
}

.message.error {
  animation: errorShake 0.5s ease-in-out;
}

@keyframes streamingPulse {
  0%, 100% { 
    box-shadow: var(--shadow-lg), 0 0 10px rgba(0, 245, 160, 0.3);
  }
  50% { 
    box-shadow: var(--shadow-lg), 0 0 20px rgba(0, 217, 245, 0.6);
  }
}

@keyframes completionGlow {
  0% { 
    box-shadow: var(--shadow-md), 0 0 0 rgba(67, 233, 123, 0.3);
  }
  50% { 
    box-shadow: var(--shadow-md), 0 0 30px rgba(67, 233, 123, 0.8);
  }
  100% {
    box-shadow: var(--shadow-md), 0 0 0 rgba(67, 233, 123, 0);
  }
}

@keyframes errorShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.error-message {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(220, 38, 38, 0.1) 100%);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--border-radius-lg);
  color: var(--color-text-primary);
}

.error-icon {
  font-size: var(--font-size-xl);
  color: #ef4444;
  flex-shrink: 0;
}

.error-content h4 {
  margin: 0 0 var(--spacing-sm) 0;
  color: #ef4444;
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.error-content p {
  margin: 0 0 var(--spacing-sm) 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.error-details {
  background: rgba(0, 0, 0, 0.1);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius);
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.retry-btn {
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  margin-top: var(--spacing-sm);
}

.retry-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.voice-btn.listening {
  background: var(--gradient-error);
  color: white;
  animation: listeningPulse 1s ease-in-out infinite;
}

@keyframes listeningPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  color:#0b1220;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--color-bg-secondary);
  border-radius: var(--border-radius-xl);
  max-width: 600px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9) translateY(20px);
  transition: all var(--transition-normal);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(20px);
}

.modal.show .modal-content {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  color:rgb(0, 0, 0);
  border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
}

.modal-header h2 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: rgb(0, 0, 0);
  margin: 0;
}

.modal-close {
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.modal-close:hover {
  background: var(--gradient-error);
  color: white;
  border-color: transparent;
  transform: scale(1.1);
}

.modal-body {
  padding: var(--spacing-xl);
}

.setting-group {
  margin-bottom: var(--spacing-2xl);
}

.setting-group:last-child {
  margin-bottom: 0;
}

.setting-group h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--gradient-primary);
  position: relative;
}

.setting-group h3::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 50px;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
}

.setting-item {
  margin-bottom: var(--spacing-lg);
}

.setting-item:last-child {
  margin-bottom: 0;
}

.setting-item label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.current-model-info {
  margin-top: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.current-model-info .model-badge {
  background: var(--gradient-primary);
  color: white;
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.current-model-info .model-description {
  font-size: 12px;
  color: var(--color-text-muted);
  font-style: italic;
}

.voice-help {
  margin-top: var(--spacing-md);
}

.voice-help .btn-sm {
  font-size: var(--font-size-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all var(--transition-normal);
}

.voice-help .btn-sm:hover {
  background: var(--gradient-primary);
  color: white;
  border-color: transparent;
}

.voice-help-text {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--color-bg-tertiary);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--gradient-primary);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.voice-help-text p {
  margin-bottom: var(--spacing-sm);
}

.voice-help-text ul {
  margin-left: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.voice-help-text li {
  margin-bottom: var(--spacing-xs);
}

.setting-item input,
.setting-item textarea {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  transition: all var(--transition-normal);
}

.setting-item input:focus,
.setting-item textarea:focus {
  outline: none;
  border-color: var(--color-text-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.setting-item textarea {
  resize: vertical;
  min-height: 100px;
}

.setting-help {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
  font-style: italic;
  line-height: 1.4;
}

#refreshChatTitlesBtn {
  width: 100%;
  margin-bottom: var(--spacing-sm);
}

.range-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.range-container input[type="range"] {
  flex: 1;
  height: 6px;
  background: var(--color-bg-glass);
  border-radius: 3px;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

.range-container input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--gradient-primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.range-container input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: var(--shadow-lg);
}

.range-value {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  min-width: 40px;
  text-align: center;
  background: var(--color-bg-glass);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
}

.modal-footer {
  padding: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  background: var(--color-bg-secondary);
  border-radius: 0 0 var(--border-radius-xl) var(--border-radius-xl);
}

.profile-avatar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-xl);
  background: var(--color-bg-glass);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--color-border);
}

.avatar-preview {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-4xl);
  color: white;
  border: 4px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.avatar-preview:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

.avatar-preview::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, transparent 50%);
  pointer-events: none;
}

.avatar-upload-btn {
  background: var(--gradient-secondary);
  color: white;
  border: none;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-md);
}

.avatar-upload-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: var(--gradient-accent);
}

.avatar-upload-btn i {
  font-size: var(--font-size-lg);
}

.btn {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left var(--transition-slow);
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  border-radius: 20px;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  transform: scale(1.05);
}

.btn-secondary {
  background: var(--gradient-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
  background: var(--gradient-secondary);
  transform: scale(1.05);
  border-color: transparent;
  box-shadow: var(--shadow-lg);
}

.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  min-width: 320px;
  max-width: 400px;
  box-shadow: var(--shadow-xl);
  transform: translateX(100%);
  opacity: 0;
  transition: all var(--transition-normal) var(--transition-bounce);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
  border-left: 4px solid transparent;
}

.toast::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
}

.toast-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--gradient-primary);
  width: 100%;
  transform-origin: left;
  animation: toastProgress 3s linear;
  border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

.toast-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 20px;
  height: 20px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  transition: all var(--transition-fast);
  opacity: 0.7;
}

.toast-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-primary);
  opacity: 1;
  transform: scale(1.1);
}

.toast-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
  min-width: 0;
}

.toast-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.toast-message {
  flex: 1;
  min-width: 0;
  word-wrap: break-word;
  line-height: 1.4;
}

@keyframes toastProgress {
  from { transform: scaleX(1); }
  to { transform: scaleX(0); }
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
  animation: toastSlideIn 0.4s var(--transition-bounce);
}

.toast.show::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.1) 50%, transparent 70%);
  animation: toastShimmer 2s ease-in-out infinite;
  pointer-events: none;
}

@keyframes toastShimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

@keyframes toastSlideIn {
  0% {
    transform: translateX(100%) scale(0.8);
    opacity: 0;
  }
  50% {
    transform: translateX(-10px) scale(1.05);
    opacity: 0.8;
  }
  100% {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

.toast.success {
  border-left-color: #10b981;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
}

.toast.error {
  border-left-color: #ef4444;
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(239, 68, 68, 0.05) 100%);
}

.toast.warning {
  border-left-color: #f59e0b;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(245, 158, 11, 0.05) 100%);
}

.toast.info {
  border-left-color: #3b82f6;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(59, 130, 246, 0.05) 100%);
}

.fab {
  position: fixed;
  width: 56px;
  height: 56px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  color: white;
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  z-index: var(--z-fixed);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  backdrop-filter: blur(15px);
  border: 2px solid rgba(255, 255, 255, 0.2);
  animation: fabFloat 3s ease-in-out infinite;
}

@keyframes fabFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-5px); }
}

.fab:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  background: var(--gradient-secondary);
}

.fab:active {
  transform: scale(0.95);
}

@keyframes fabSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.8);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.fab.visible {
  opacity: 1;
  pointer-events: auto;
}

.fab.hidden {
  opacity: 0;
  pointer-events: none;
}

* {
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

button:active {
  transform: scale(0.95);
}

.input-wrapper:focus-within {
  transform: translateY(-1px);
}

.message:hover .avatar {
  transform: scale(1.1);
  animation: bounce 0.6s ease;
}

.sidebar-toggle:hover {
  animation: pulse 0.6s ease infinite;
}

.logo:hover i {
  animation: bounce 0.6s ease;
}

.new-chat-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.sidebar.collapsed {
  transform: translateX(-100%);
}
@media (min-width: 768px) {
  .sidebar.collapsed + .main-content {
    margin-left: 0;
  }
}

.quick-action-btn:hover i {
  animation: bounce 0.6s ease;
}

.send-btn:hover {
  animation: pulse 0.6s ease infinite;
}

.fab:hover {
  animation: bounce 0.6s ease;
}

.modal.show .modal-content {
  animation: slideInUp 0.4s ease-out;
}

.toast.show {
  animation: slideInRight 0.3s ease-out;
}

.error-message {
  animation: slideInUp 0.4s ease-out;
}

.typing-indicator {
  animation: slideInUp 0.3s ease-out;
}

.context-menu {
  position: fixed;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(20px);
  z-index: 99999;
  min-width: 180px;
  max-width: 300px;
  padding: var(--spacing-xs);
  animation: contextMenuSlideIn 0.2s ease-out;
  border: 1px solid var(--color-border);
}

@keyframes contextMenuSlideIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-5px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.context-menu-item {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: hidden;
  user-select: none;
}

.context-menu-item:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateX(2px);
}

.context-menu-item.danger {
  color: #ef4444;
}

.context-menu-item.danger:hover {
  background: var(--gradient-error);
  color: white;
}

.context-menu-separator {
  height: 1px;
  background: var(--color-border);
  margin: var(--spacing-xs) 0;
  opacity: 0.5;
}

.context-menu-item[data-icon]::before {
  content: attr(data-icon);
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  width: 16px;
  text-align: center;
  margin-right: var(--spacing-sm);
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .sidebar-toggle {
    display: flex;
  }
  
  .main-header {
    padding:45px 10px;
  }
  
  .header-title h1 {
    font-size: var(--font-size-lg);
    
  }
  
  .chat-meta {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .input-area {
    padding: var(--spacing-lg);
  }
  
  .modal-content {
    width: 95%;
    margin: var(--spacing-lg);
  }
  
  .toast {
    min-width: 280px;
    max-width: 90vw;
    padding: var(--spacing-md);
  }
  
  .fab {
    width: 45px;
    height: 45px;
    font-size: var(--font-size-base);
  }

  .sidebar:not(.show) {
    transform: translateX(-100%);
  }

  body.sidebar-open {
    overflow: hidden;
  }

  .context-menu {
    min-width: 200px;
    max-width: 90vw;
    font-size: var(--font-size-base);
  }
  
  .context-menu-item {
    padding: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .message {
    gap: var(--spacing-sm);
    max-width: 95%;
  }
  
  .message.user,
  .message.assistant {
    max-width: 85%;
  }
  
  .ai-message .content {
    padding-left: 16px;
    padding-right: 12px;
  }
  
  .welcome-message {
    padding: var(--spacing-xl) var(--spacing-lg);
  }
  
  .welcome-icon {
    width: 60px;
    height: 60px;
    font-size: var(--font-size-2xl);
  }
  
  .welcome-message h2 {
    font-size: var(--font-size-2xl);
  }
  
  .input-wrapper {
    padding: var(--spacing-md);
  }
  
  .input-actions {
    gap: var(--spacing-xs);
  }
  
  .input-action-btn,
  .send-btn {
    width: 36px;
    height: 36px;
  }
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid rgba(0, 198, 255, 0.6);
  outline-offset: 2px;

}

.compact-mode .message { gap: var(--spacing-sm); }
.compact-mode .ai-message .content,
.compact-mode .user-message .content { padding: 8px 10px; }
.compact-mode .message-metadata { gap: var(--spacing-sm); }
.compact-mode .chat-container { padding: var(--spacing-sm); }
.compact-mode .input-wrapper { padding: var(--spacing-sm); }
.compact-mode .action-btn { width: 28px; height: 28px; }

@media print {
  .sidebar,
  .input-area,
  .fab,
  .modal,
  .toast-container {
    display: none !important;
  }
  
  .main-content {
    margin-left: 0 !important;
  }
  
  .chat-container {
    overflow: visible !important;
  }
}

.attachments-row {
  display: none;
  gap: 8px;
  padding-top: 8px;
  flex-wrap: wrap;
}

.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-surface, #ffffff);
  border: 1px solid var(--color-border, rgba(0,0,0,0.1));
  border-radius: 10px;
  padding: 6px 8px;
  box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.05));
}

.attachment-thumb {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--color-border, rgba(0,0,0,0.1));
}

.attachment-name {
  max-width: 160px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-text-primary, #111827);
  font-size: 12px;
}

.attachment-remove {
  background: transparent;
  border: none;
  color: var(--color-text-muted, #6b7280);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
}

.message-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.message-attachments .attachment-thumb {
  max-width: 200px;
  max-height: 150px;
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  object-fit: cover;
}

.message-attachments .attachment-file-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
}

.message-attachments .attachment-icon {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.message-attachments .attachment-name {
  font-weight: 500;
  color: var(--color-text);
}

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

#avatarPreview {
  background-size: cover;
  background-position: center;
}

#inputArea.drag-over .input-wrapper {
  outline: 2px dashed var(--color-text-accent, #8b5cf6);
  outline-offset: 6px;
  background: rgba(139, 92, 246, 0.06);
}

.attachment-pdf-icon {
  display: inline-flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: #ef4444;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: 6px;
}
.attachment-pdf-icon i { font-size: 18px; }

.attachment-pdf-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-surface, #ffffff);
  border: 1px solid var(--color-border, rgba(0,0,0,0.1));
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--color-text-primary, #111827);
  text-decoration: none;
}
.attachment-pdf-link:hover { filter: brightness(0.98); }

.sidebar-close-btn {
  background: transparent;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  cursor: pointer;
  margin-left: auto;
  border:none;
  margin-right: 0.5rem;
  transition: all var(--transition-normal);
  position: relative;
  z-index: 2;
}
.sidebar-close-btn:hover,
.sidebar-close-btn:focus {
  background:transparent;
  color: #fff;
  border-color: transparent;
}
@media (min-width: 768px) {
  .sidebar-close-btn {
    display: none;
  }
}

.setting-item select {
  padding: 10px 12px;
  font-size: 14px;
  color: #1c1919;

  border-radius: 12px;
  outline: none;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.3s ease;
  appearance: none;
  cursor: pointer;
  box-shadow: inset 0 0 10px rgba(255,255,255,0.05);
  background: rgba(213, 222, 225, 0.753);
  border:none;
}

.setting-item select:hover,
.setting-item select:focus {
  border-color: rgba(45, 75, 75, 0.8);
  box-shadow: 0 0 12px rgba(52, 102, 102, 0.395);
  background: rgba(116, 137, 137, 0.1);
  color:#0b1220;
  border:none;
}

.setting-item select option {
  background: #fbfafa;
  color: #000000;
  padding: 8px;
  border-radius: 20px;
  border:none;
}