/* ============================================
   CSS Variables & Reset
   Концепция: Industrial Semi-Dark Theme
   ============================================ */
:root {
  /* Colors - Industrial Semi-Dark Theme */
  --bg-app: #0B1120;
  --bg-sidebar: #020617;
  --bg-card: #0F172A;
  --bg-input: #0F172A;
  
  --surface-card: rgba(15, 23, 42, 0.95);
  --surface-hover: rgba(30, 41, 59, 0.6);
  
  /* Borders - тонкие, аккуратные */
  --border-subtle: rgba(255, 255, 255, 0.04);
  --border-default: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.12);
  
  /* Primary Accent - Корпоративный красный */
  --accent-primary: #DC2626;
  --accent-primary-hover: #EF4444;
  --accent-primary-soft: rgba(220, 38, 38, 0.12);
  --accent-primary-border: rgba(220, 38, 38, 0.3);
  
  /* Secondary Accent - Сине-бирюзовый для AI */
  --accent-ai: #38BDF8;
  --accent-ai-soft: rgba(56, 189, 248, 0.12);
  --accent-ai-border: rgba(56, 189, 248, 0.3);
  
  /* Model Colors */
  --model-gpt: #10B981;
  --model-claude: #F59E0B;
  --model-gemini: #8B5CF6;
  --model-default: #38BDF8;
  
  /* Text */
  --text-primary: #E5E7EB;
  --text-secondary: #9CA3AF;
  --text-muted: #6B7280;
  
  /* Status */
  --success: #22C55E;
  --warning: #F59E0B;
  --error: #EF4444;
  --error-soft: rgba(239, 68, 68, 0.12);
  
  /* Shadows - аккуратные, без свечения */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
  
  /* Glow - только для CTA при hover */
  --glow-cta: 0 0 30px rgba(220, 38, 38, 0.4);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Transitions - оптимизированные тайминги */
  --transition-micro: 0.1s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Easing */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index */
  --z-sidebar: 40;
  --z-backdrop: 30;
  --z-modal: 60;
  --z-tooltip: 70;
  
  /* Sizes */
  --sidebar-width: 280px;
  --header-height: 52px;
  --composer-min-height: 140px;
}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-app);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

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

/* ============================================
   Grid Background Pattern
   ============================================ */
.grid-pattern {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
  opacity: 0.5;
}

/* ============================================
   Animations - Core Keyframes
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-16px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(16px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes scaleInBounce {
  0% {
    opacity: 0;
    transform: scale(0.9);
  }
  60% {
    transform: scale(1.02);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes typing {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  30% {
    transform: translateY(-3px);
    opacity: 1;
  }
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-4px); }
  20%, 40%, 60%, 80% { transform: translateX(4px); }
}

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

@keyframes pulseRing {
  0% {
    transform: scale(1);
    opacity: 0.6;
  }
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

@keyframes titlePulse {
  0% { color: var(--text-primary); }
  50% { 
    color: var(--accent-ai); 
    transform: scale(1.02); 
  }
  100% { 
    color: var(--text-primary); 
    transform: scale(1); 
  }
}

@keyframes notificationSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes chipPop {
  0% {
    opacity: 0;
    transform: scale(0.8);
  }
  60% {
    transform: scale(1.05);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes floatSubtle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* ============================================
   Animation Utility Classes
   ============================================ */
.animate-fade-in {
  animation: fadeIn 0.2s var(--ease-out-expo) forwards;
}

.animate-fade-in-up {
  opacity: 0;
  animation: fadeInUp 0.35s var(--ease-out-expo) forwards;
}

.animate-fade-in-down {
  opacity: 0;
  animation: fadeInDown 0.35s var(--ease-out-expo) forwards;
}

.animate-slide-in-left {
  opacity: 0;
  animation: slideInLeft 0.3s var(--ease-out-expo) forwards;
}

.animate-slide-in-right {
  opacity: 0;
  animation: slideInRight 0.3s var(--ease-out-expo) forwards;
}

.animate-scale-in {
  animation: scaleIn 0.2s var(--ease-out-expo) forwards;
}

.animate-scale-in-bounce {
  animation: scaleInBounce 0.35s var(--ease-out-expo) forwards;
}

.animate-message-in {
  opacity: 0;
  animation: messageSlideIn 0.3s var(--ease-out-expo) forwards;
}

.animate-shimmer {
  background: linear-gradient(
    90deg,
    var(--surface-hover) 25%,
    var(--bg-card) 50%,
    var(--surface-hover) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

.animate-shake {
  animation: shake 0.5s var(--ease-out-expo);
}

.animate-fade-out {
  animation: fadeOut 0.25s var(--ease-in-out) forwards;
}

.animate-float {
  animation: floatSubtle 3s ease-in-out infinite;
}

/* ============================================
   Login Page
   ============================================ */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  position: relative;
  overflow: hidden;
  background: var(--bg-sidebar);
}

.login-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.login-bg-gradient {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse at top left, rgba(220, 38, 38, 0.08) 0%, transparent 40%),
    radial-gradient(ellipse at bottom right, rgba(56, 189, 248, 0.06) 0%, transparent 40%),
    var(--bg-sidebar);
}

.login-bg-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.login-bg-glow {
  display: none;
}

.login-container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 400px;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-xl);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.login-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl), 0 0 40px rgba(56, 189, 248, 0.05);
}

.login-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.login-logo {
  height: 48px;
  margin-bottom: var(--spacing-md);
}

.login-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.login-subtitle {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-sm);
}

.login-models-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.25rem 0.75rem;
  background: var(--surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.login-models-badge span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.login-models-badge .dot-gpt { background: var(--model-gpt); }
.login-models-badge .dot-claude { background: var(--model-claude); }
.login-models-badge .dot-gemini { background: var(--model-gemini); }

.login-error {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--error-soft);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md);
  color: #FCA5A5;
  font-size: 0.875rem;
  margin-bottom: var(--spacing-lg);
}

.login-error-icon {
  flex-shrink: 0;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.login-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: 0.875rem var(--spacing-lg);
  background: var(--accent-primary);
  border: none;
  border-radius: var(--radius-lg);
  color: white;
  font-weight: 600;
  font-size: 0.95rem;
  transition: 
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-normal);
  overflow: hidden;
}

.login-btn:hover {
  background: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--glow-cta);
}

.login-btn:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
  transition: transform 0.1s;
}

/* Button shine effect */
.login-btn-shine,
.primary-btn-shine {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.15),
    transparent
  );
  transition: left 0.5s var(--ease-out-expo);
  pointer-events: none;
}

.login-btn:hover .login-btn-shine,
.primary-btn:hover .primary-btn-shine {
  left: 100%;
}

.login-footer {
  text-align: center;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8rem;
}

/* ============================================
   Form Elements
   ============================================ */
.form-group {
  position: relative;
}

.form-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.form-group:focus-within .form-label {
  color: var(--text-primary);
}

.required {
  color: var(--error);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: 
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-muted);
  transition: opacity var(--transition-fast);
}

.form-input:focus::placeholder,
.form-textarea:focus::placeholder {
  opacity: 0.6;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent-ai);
  box-shadow: 0 0 0 3px var(--accent-ai-soft);
  background: rgba(15, 23, 42, 0.8);
}

.form-input:hover:not(:focus),
.form-select:hover:not(:focus),
.form-textarea:hover:not(:focus) {
  border-color: var(--border-strong);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236B7280' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.password-wrapper {
  position: relative;
}

.password-toggle {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  padding: 0.25rem;
  transition: 
    color var(--transition-fast),
    transform var(--transition-fast);
}

.password-toggle:hover {
  color: var(--text-primary);
  transform: translateY(-50%) scale(1.1);
}

.password-toggle:active {
  transform: translateY(-50%) scale(0.95);
}

/* Checkbox */
.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  user-select: none;
}

.form-checkbox input {
  display: none;
}

.form-checkbox-box {
  width: 18px;
  height: 18px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
  flex-shrink: 0;
  background: var(--bg-input);
}

.form-checkbox:hover .form-checkbox-box {
  border-color: var(--accent-primary-border);
}

.form-checkbox:active .form-checkbox-box {
  transform: scale(0.9);
}

.form-checkbox-check {
  opacity: 0;
  transform: scale(0);
  color: white;
  font-size: 0.7rem;
  font-weight: bold;
  transition: 
    opacity var(--transition-fast),
    transform var(--transition-fast);
}

.form-checkbox input:checked + .form-checkbox-box {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.form-checkbox input:checked + .form-checkbox-box .form-checkbox-check {
  opacity: 1;
  transform: scale(1);
}

.form-checkbox-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.form-checkbox:hover .form-checkbox-label {
  color: var(--text-primary);
}

/* ============================================
   Buttons
   ============================================ */
.primary-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  background: var(--accent-primary);
  border: none;
  border-radius: var(--radius-lg);
  color: white;
  font-weight: 600;
  font-size: 0.9rem;
  transition: 
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-normal);
  overflow: hidden;
}

.primary-btn:hover {
  background: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--glow-cta);
}

.primary-btn:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
  transition: transform 0.1s;
}

.primary-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.65rem 1.25rem;
  background: transparent;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.875rem;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.secondary-btn:hover {
  background: var(--surface-hover);
  border-color: var(--border-strong);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.secondary-btn:active {
  transform: translateY(0) scale(0.98);
  transition: transform 0.1s;
}

/* ============================================
   Layout - ИСПРАВЛЕНО для мобильных
   ============================================ */
.layout {
  display: flex;
  height: 100vh;
  height: 100dvh; /* Dynamic viewport height - учитывает адресную строку */
  overflow: hidden;
  position: relative;
}

/* Fallback для старых браузеров */
@supports not (height: 100dvh) {
  .layout {
    height: -webkit-fill-available;
  }
}

/* ============================================
   Sidebar
   ============================================ */
.sidebar {
  width: var(--sidebar-width);
  max-width: 85vw;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  z-index: var(--z-sidebar);
  flex-shrink: 0;
  transition: transform var(--transition-smooth);
  will-change: transform;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.sidebar-header-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-logo {
  height: 24px;
  width: auto;
  transition: transform var(--transition-normal);
}

.sidebar-header:hover .sidebar-logo {
  transform: scale(1.02);
}

.sidebar-title {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.logout-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.75rem;
  transition: 
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.logout-link:hover {
  background: var(--surface-hover);
  color: var(--text-secondary);
  border-color: var(--border-default);
  transform: translateX(-2px);
}

.logout-link:active {
  transform: translateX(-2px) scale(0.95);
}

.sidebar-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  gap: var(--spacing-md);
  overflow: hidden;
  min-height: 0;
}

.btn-new-chat {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: 0.625rem var(--spacing-md);
  background: var(--accent-primary-soft);
  border: 1px solid var(--accent-primary-border);
  border-radius: var(--radius-md);
  color: var(--accent-primary-hover);
  font-weight: 500;
  font-size: 0.875rem;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-normal);
  flex-shrink: 0;
}

.btn-new-chat:hover {
  background: rgba(220, 38, 38, 0.2);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.15);
}

.btn-new-chat:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
  transition: transform 0.1s;
}

.btn-new-chat-icon {
  font-size: 1rem;
  transition: transform var(--transition-fast);
}

.btn-new-chat:hover .btn-new-chat-icon {
  transform: rotate(90deg);
}

/* ============================================
   Chat List - Scrollable Container
   ============================================ */
.chat-list {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 0;
  margin: 0 calc(-1 * var(--spacing-md));
  padding: 0 var(--spacing-md);
  scroll-behavior: smooth;
}

.chat-list::-webkit-scrollbar {
  width: 3px;
}

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

.chat-list::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

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

/* ============================================
   Chat List Items - Enhanced Hover
   ============================================ */
.chat-item-link {
  display: block;
  margin-bottom: 7px;
}

.chat-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
  cursor: pointer;
  background: transparent;
}

.chat-item:hover {
  background: rgba(56, 189, 248, 0.06);
  border-color: var(--border-default);
  transform: translateX(4px);
}

.chat-item.active {
  background: var(--bg-card);
  border-color: var(--accent-ai-border);
}

.chat-item.active:hover {
  background: rgba(15, 23, 42, 0.95);
  border-color: var(--accent-ai);
}

.chat-item-indicator {
  width: 3px;
  height: 20px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  background: var(--model-default);
  transition: 
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.chat-item:hover .chat-item-indicator {
  box-shadow: 0 0 8px currentColor;
  transform: scaleY(1.1);
}

.chat-item-indicator.model-gpt { background: var(--model-gpt); }
.chat-item-indicator.model-claude { background: var(--model-claude); }
.chat-item-indicator.model-gemini { background: var(--model-gemini); }

.chat-item-content {
  flex: 1;
  min-width: 0;
}

.chat-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition-fast);
}

.chat-item:hover .chat-title {
  color: #fff;
}

.chat-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.chat-model-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 1px 6px;
  background: var(--surface-hover);
  border-radius: var(--radius-sm);
  font-size: 0.65rem;
}

.chat-model-badge .model-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
}

.chat-model-badge.model-gpt .model-dot { background: var(--model-gpt); }
.chat-model-badge.model-claude .model-dot { background: var(--model-claude); }
.chat-model-badge.model-gemini .model-dot { background: var(--model-gemini); }

.chat-item-delete {
  opacity: 0;
  padding: var(--spacing-xs);
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  transition: 
    opacity var(--transition-fast),
    color var(--transition-fast),
    background var(--transition-fast),
    transform var(--transition-fast);
  transform: scale(0.8);
}

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

.chat-item-delete:hover {
  color: var(--error);
  background: var(--error-soft);
}

.chat-item-delete:active {
  transform: scale(0.9);
}

.chat-list-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  text-align: center;
  animation: fadeIn 0.4s var(--ease-out-expo);
}

.chat-list-empty-icon {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  opacity: 0.3;
}

.chat-list-empty-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.chat-list-empty-hint {
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: var(--spacing-xs);
}

.sidebar-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
}

.sidebar-footer-text {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

.sidebar-backdrop {
  display: none;
}

/* ============================================
   Main Content - ИСПРАВЛЕНО
   ============================================ */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0; /* Важно для flex overflow */
  background: var(--bg-app);
  position: relative;
}

.main::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top, rgba(56, 189, 248, 0.02) 0%, transparent 50%);
  pointer-events: none;
}

.main .grid-pattern {
  opacity: 0.3;
}

/* ============================================
   Chat Header - Компактный
   ============================================ */
.main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-card);
  flex-shrink: 0;
  min-height: var(--header-height);
  position: relative;
  z-index: 1;
}

.header-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.chat-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0;
  transition: color var(--transition-fast);
}

.chat-name.title-updated {
  animation: titlePulse 0.5s var(--ease-out-expo);
}

.chat-subtitle {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.model-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: var(--accent-ai-soft);
  border: 1px solid var(--accent-ai-border);
  border-radius: var(--radius-sm);
  color: var(--accent-ai);
  font-size: 0.7rem;
  font-weight: 500;
  transition: 
    background var(--transition-fast),
    transform var(--transition-fast);
}

.model-badge:hover {
  background: rgba(56, 189, 248, 0.18);
  transform: scale(1.02);
}

.thinking-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: var(--surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.7rem;
}

.web-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: var(--surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.7rem;
  opacity: 0.6;
  transition: 
    opacity var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.web-badge.active {
  background: rgba(34, 197, 94, 0.12);
  border-color: rgba(34, 197, 94, 0.3);
  color: var(--success);
  opacity: 1;
}

.header-separator {
  color: var(--text-muted);
  opacity: 0.4;
  font-size: 0.6rem;
}

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

.header-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
  cursor: pointer;
}

.header-btn:hover {
  background: var(--surface-hover);
  border-color: var(--border-default);
  color: var(--text-primary);
  transform: scale(1.05);
}

.header-btn:active {
  transform: scale(0.95);
  transition: transform 0.1s;
}

.header-model-switcher {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 4px 8px;
  background: var(--surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.model-icon-btn {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.8rem;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
  cursor: pointer;
}

.model-icon-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  transform: scale(1.05);
}

.model-icon-btn.active {
  background: var(--bg-card);
  border-color: var(--border-default);
  color: var(--text-primary);
}

.model-icon-btn.active.model-gpt { border-color: var(--model-gpt); color: var(--model-gpt); }
.model-icon-btn.active.model-claude { border-color: var(--model-claude); color: var(--model-claude); }
.model-icon-btn.active.model-gemini { border-color: var(--model-gemini); color: var(--model-gemini); }

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

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  background: var(--surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.header-badge.active {
  background: var(--accent-ai-soft);
  border-color: var(--accent-ai-border);
  color: var(--accent-ai);
}

.header-badge-icon {
  font-size: 0.75rem;
}

/* ============================================
   Messages - ИСПРАВЛЕНО для мобильных
   ============================================ */
.messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-lg);
  scroll-behavior: smooth;
  position: relative;
  z-index: 1;
  min-height: 0; /* Критично для правильного flex overflow */
  -webkit-overflow-scrolling: touch; /* Плавная прокрутка на iOS */
}

.messages::-webkit-scrollbar {
  width: 5px;
}

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

.messages::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

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

.message {
  display: flex;
  gap: var(--spacing-md);
  max-width: 850px;
  margin: 0 auto var(--spacing-md) auto;
}

.message.user {
  flex-direction: row-reverse;
}

.avatar {
  position: relative;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.85rem;
  transition: transform var(--transition-fast);
}

.message:hover .avatar {
  transform: scale(1.05);
}

.avatar-ai {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  color: var(--accent-ai);
}

.avatar-user {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
}

.avatar-pulse {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--accent-ai);
  animation: pulseRing 2s ease-out infinite;
  pointer-events: none;
}

.message-body {
  flex: 1;
  min-width: 0;
}

.bubble {
  position: relative;
  padding: var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  font-size: 0.9rem;
  line-height: 1.7;
  transition: 
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.message:hover .bubble {
  border-color: var(--border-default);
}

.message.assistant .bubble {
  background: var(--bg-sidebar);
  padding-left: calc(var(--spacing-md) + 4px);
}

.message.assistant .bubble::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent-ai);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  transition: box-shadow var(--transition-fast);
}

.message.assistant:hover .bubble::before {
  box-shadow: 0 0 8px var(--accent-ai);
}

.message.assistant.model-gpt .bubble::before { background: var(--model-gpt); }
.message.assistant.model-claude .bubble::before { background: var(--model-claude); }
.message.assistant.model-gemini .bubble::before { background: var(--model-gemini); }

.message.user .bubble {
  background: #111827;
  border-color: rgba(255, 255, 255, 0.06);
}

.bubble-content {
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

/* Markdown content styling */
.bubble-content p {
  margin: 0 0 0.75rem 0;
}

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

.bubble-content h1,
.bubble-content h2,
.bubble-content h3,
.bubble-content h4 {
  margin: 1rem 0 0.5rem 0;
  font-weight: 600;
  color: var(--text-primary);
}

.bubble-content h1 { font-size: 1.2rem; }
.bubble-content h2 { font-size: 1.1rem; }
.bubble-content h3 { font-size: 1rem; }

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

.bubble-content ul,
.bubble-content ol {
  margin: 0.5rem 0 0.75rem 1.25rem;
  padding: 0;
}

.bubble-content li {
  margin-bottom: 0.25rem;
}

.bubble-content code {
  font-family: 'JetBrains Mono', 'SF Mono', Monaco, Consolas, monospace;
  font-size: 0.8em;
  padding: 0.15em 0.4em;
  background: var(--surface-hover);
  border-radius: var(--radius-sm);
  color: var(--accent-ai);
}

.bubble-content pre {
  margin: 0.75rem 0;
  padding: var(--spacing-md);
  background: var(--bg-sidebar);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.bubble-content pre code {
  padding: 0;
  background: transparent;
  color: var(--text-primary);
  display: block;
  white-space: pre;
}

.bubble-content blockquote {
  margin: 0.75rem 0;
  padding-left: var(--spacing-md);
  border-left: 2px solid var(--accent-ai);
  color: var(--text-secondary);
  font-style: italic;
}

.bubble-content a {
  color: var(--accent-ai);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.bubble-content a:hover {
  color: var(--accent-primary-hover);
}

.bubble-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.75rem 0;
  font-size: 0.85rem;
}

.bubble-content th,
.bubble-content td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-default);
  text-align: left;
}

.bubble-content th {
  background: var(--surface-hover);
  font-weight: 600;
}

.bubble-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Code block wrapper */
.code-block {
  position: relative;
  margin: 0.75rem 0;
}

.code-block pre {
  margin: 0;
  padding-right: 4rem;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  padding: 0.2rem 0.6rem;
  background: var(--surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.7rem;
  cursor: pointer;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.copy-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  transform: scale(1.05);
}

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

.copy-btn.copied {
  background: rgba(34, 197, 94, 0.15);
  border-color: var(--success);
  color: var(--success);
}

/* Table block wrapper */
.table-block {
  position: relative;
  margin: 0.75rem 0;
  overflow-x: auto;
}

.table-block .copy-btn {
  position: static;
  display: inline-flex;
}

/* Attachments */
.attachments-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-subtle);
}

.attachment-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.2rem 0.6rem;
  background: var(--surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.attachment-chip:hover {
  background: var(--bg-card);
  border-color: var(--border-default);
  transform: translateY(-1px);
}

.attachment-icon {
  font-size: 0.85rem;
}

.attachment-chip a {
  color: var(--accent-ai);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.attachment-chip a:hover {
  text-decoration: underline;
}

.attachment-size {
  color: var(--text-muted);
  font-size: 0.7rem;
}

.attachment-pending {
  opacity: 0.6;
  border-style: dashed;
}

.attachment-pending a {
  pointer-events: none;
  color: var(--text-muted);
}

.attachment-chip.attachment-media {
  border-color: var(--warning);
  background: rgba(245, 158, 11, 0.1);
}

.attachment-chip.attachment-error {
  border-color: var(--error);
  background: var(--error-soft);
  opacity: 0.7;
}

.attachment-chip.attachment-error a {
  text-decoration: line-through;
  color: var(--text-muted);
}

/* Message meta */
.message-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.status-text {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.status-loading {
  color: var(--accent-ai);
}

.status-error {
  color: var(--error);
}

.status-done {
  color: var(--success);
}

.status-classifying {
  color: var(--warning);
}

.status-classifying .typing-indicator span {
  background: var(--warning);
}

/* Typing indicator */
.typing-indicator {
  display: inline-flex;
  gap: 3px;
}

.typing-indicator span {
  width: 4px;
  height: 4px;
  background: var(--accent-ai);
  border-radius: 50%;
  animation: typing 1.4s infinite;
}

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

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

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

.empty-state-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.3;
  transition: transform var(--transition-normal);
}

.empty-state:hover .empty-state-icon {
  transform: scale(1.1) rotate(5deg);
}

.empty-state-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.empty-state-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ============================================
   Chat Controls
   ============================================ */
.chat-controls {
  padding: var(--spacing-xs) var(--spacing-lg);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-card);
  flex-shrink: 0;
}

.chat-controls-inner {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
  max-width: 850px;
  margin: 0 auto;
  flex-wrap: wrap;
}

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

.control-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.control-select {
  padding: 0.25rem 1.75rem 0.25rem 0.5rem;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.75rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' fill='%236B7280' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  transition: 
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.control-select:focus {
  border-color: var(--accent-ai);
  box-shadow: 0 0 0 2px var(--accent-ai-soft);
  outline: none;
}

.control-select:hover:not(:focus) {
  border-color: var(--border-default);
}

.control-checkbox-inline {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.control-checkbox-inline:hover {
  color: var(--text-primary);
}

.control-checkbox-inline input {
  display: none;
}

.control-checkbox-box {
  width: 14px;
  height: 14px;
  border: 1px solid var(--border-default);
  border-radius: 3px;
  position: relative;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
  background: var(--bg-input);
}

.control-checkbox-inline:hover .control-checkbox-box {
  border-color: var(--accent-ai-border);
}

.control-checkbox-inline:active .control-checkbox-box {
  transform: scale(0.9);
}

.control-checkbox-inline input:checked + .control-checkbox-box {
  background: var(--accent-ai);
  border-color: var(--accent-ai);
}

.control-checkbox-inline input:checked + .control-checkbox-box::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 9px;
  font-weight: bold;
}

/* ============================================
   Composer - ИСПРАВЛЕНО для мобильных
   ============================================ */
.composer {
  padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
  padding-bottom: max(var(--spacing-lg), env(safe-area-inset-bottom));
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-card);
  flex-shrink: 0;
  position: relative;
  z-index: 10;
  transition: border-color var(--transition-fast);
}

.composer.dragover {
  border-top-color: var(--accent-ai);
}

.composer-form {
  max-width: 850px;
  margin: 0 auto;
}

.composer-main {
  display: flex;
  gap: var(--spacing-md);
}

.textarea-wrapper {
  position: relative;
  flex: 1;
}

.textarea-wrapper textarea {
  width: 100%;
  min-height: 44px;
  max-height: 180px;
  padding: 0.625rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.5;
  resize: none;
  outline: none;
  transition: 
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast);
}

.textarea-wrapper textarea::placeholder {
  color: var(--text-muted);
  transition: opacity var(--transition-fast);
}

.textarea-wrapper textarea:focus::placeholder {
  opacity: 0.6;
}

.textarea-wrapper textarea:focus {
  border-color: var(--accent-ai);
  box-shadow: 0 0 0 3px var(--accent-ai-soft);
  background: rgba(15, 23, 42, 0.8);
}

.send-btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  min-width: 100px;
  padding: 0 var(--spacing-lg);
  background: var(--accent-primary);
  border: none;
  border-radius: var(--radius-lg);
  color: white;
  font-weight: 600;
  font-size: 0.85rem;
  transition: 
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-normal);
  overflow: hidden;
}

.send-btn:hover:not(:disabled) {
  background: var(--accent-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--glow-cta);
}

.send-btn:active:not(:disabled) {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
  transition: transform 0.1s;
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.send-btn.loading {
  pointer-events: none;
}

.send-btn.loading .send-btn-icon,
.send-btn.loading .send-btn-text {
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.send-btn.loading .send-btn-loader {
  opacity: 1;
}

.send-btn-icon svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.send-btn:hover:not(:disabled) .send-btn-icon svg {
  transform: translateX(2px) translateY(-2px);
}

.send-btn-loader {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.composer-bottom {
  margin-top: var(--spacing-md);
}

.file-upload-area {
  margin-bottom: var(--spacing-sm);
}

.file-input-label {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.4rem 0.875rem;
  background: transparent;
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  transition: 
    border-color var(--transition-fast),
    color var(--transition-fast),
    background var(--transition-fast),
    transform var(--transition-fast);
}

.file-input-label:hover {
  border-color: var(--accent-ai-border);
  color: var(--accent-ai);
  transform: translateY(-1px);
}

.file-input-label:active {
  transform: translateY(0) scale(0.98);
}

.file-input-label.dragover {
  border-color: var(--accent-ai);
  background: var(--accent-ai-soft);
  color: var(--accent-ai);
}

.file-input-icon {
  font-size: 0.9rem;
  transition: transform var(--transition-fast);
}

.file-input-label:hover .file-input-icon {
  transform: rotate(-10deg);
}

.file-input-hidden {
  display: none;
}

.selected-files {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.selected-file-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.3rem 0.65rem;
  background: var(--surface-hover);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  animation: chipPop 0.25s var(--ease-out-back);
}

.selected-file-chip.media-file {
  border-color: var(--warning);
  background: rgba(245, 158, 11, 0.1);
}

.file-media-badge {
  font-size: 0.85rem;
}

.selected-file-name {
  max-width: 140px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-secondary);
}

.selected-file-size {
  color: var(--text-muted);
  font-size: 0.7rem;
}

.selected-file-remove {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 0;
  cursor: pointer;
  border-radius: 50%;
  transition: 
    background var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.selected-file-remove:hover {
  background: var(--error-soft);
  color: var(--error);
  transform: scale(1.1);
}

.selected-file-remove:active {
  transform: scale(0.9);
}

/* Upload progress */
.upload-progress {
  display: none;
  margin-top: var(--spacing-md);
}

.upload-progress.active {
  display: block;
  animation: fadeIn 0.2s var(--ease-out-expo);
}

.upload-progress-bar {
  height: 3px;
  background: var(--surface-hover);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

.upload-progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-ai);
  border-radius: var(--radius-full);
  transition: width 0.15s var(--ease-out-expo);
}

.upload-progress-text {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ============================================
   New Chat Page
   ============================================ */
.new-chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  padding-bottom: max(var(--spacing-xl), env(safe-area-inset-bottom));
  gap: var(--spacing-lg);
  overflow-y: auto;
  position: relative;
  z-index: 1;
  min-height: 0;
  -webkit-overflow-scrolling: touch;
}

.new-chat-card {
  position: relative;
  width: 100%;
  max-width: 460px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: 
    transform var(--transition-normal),
    box-shadow var(--transition-normal),
    border-color var(--transition-fast);
}

.new-chat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-default);
}

.new-chat-card-glow {
  position: absolute;
  top: -1px;
  left: 20%;
  right: 20%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
  border-radius: var(--radius-full);
  opacity: 0.4;
  transition: opacity var(--transition-normal);
}

.new-chat-card:hover .new-chat-card-glow {
  opacity: 0.7;
}

.new-chat-card-glow-special {
  background: linear-gradient(90deg, transparent, var(--accent-ai), transparent);
}

.new-chat-card-special {
  border-style: dashed;
  border-color: var(--accent-primary-border);
  background: linear-gradient(135deg, rgba(220, 38, 38, 0.03), rgba(56, 189, 248, 0.02));
}

.new-chat-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.new-chat-card-icon {
  font-size: 1.25rem;
  color: var(--accent-ai);
  transition: transform var(--transition-normal);
}

.new-chat-card:hover .new-chat-card-icon {
  transform: scale(1.1) rotate(5deg);
}

.new-chat-card-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.new-chat-card-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.new-chat-card-notice {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--surface-hover);
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  transition: border-color var(--transition-fast);
}

.new-chat-card:hover .new-chat-card-notice {
  border-color: var(--border-strong);
}

.notice-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

.notice-content {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.notice-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.new-chat-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* ============================================
   Tool Button
   ============================================ */
.tool-button {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--accent-ai-soft);
  border: 1px solid var(--accent-ai-border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.9rem;
  text-align: left;
  overflow: hidden;
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-normal);
  cursor: pointer;
}

.tool-button:hover {
  background: rgba(56, 189, 248, 0.18);
  border-color: var(--accent-ai);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.15);
}

.tool-button:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
  transition: transform 0.1s;
}

.tool-button-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.tool-button:hover .tool-button-icon {
  transform: scale(1.1);
}

.tool-button-text {
  flex: 1;
}

.tool-button-arrow {
  font-size: 1.1rem;
  color: var(--text-muted);
  transition: 
    color var(--transition-fast),
    transform var(--transition-fast);
}

.tool-button:hover .tool-button-arrow {
  color: var(--accent-ai);
  transform: translateX(4px);
}

.tool-button-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at var(--mouse-x, 50%) var(--mouse-y, 50%), 
    rgba(56, 189, 248, 0.1), 
    transparent 50%
  );
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.tool-button:hover .tool-button-glow {
  opacity: 1;
}

/* ============================================
   Modal
   ============================================ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.8);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  z-index: var(--z-modal);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal-backdrop.active {
  display: flex;
  opacity: 1;
}

.modal-dialog {
  width: 100%;
  max-width: 440px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-xl);
  animation: scaleInBounce 0.3s var(--ease-out-expo);
}

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

.modal-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1rem;
  font-weight: 600;
}

.modal-title-icon {
  font-size: 1.1rem;
  color: var(--accent-ai);
}

.modal-close {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  border-radius: var(--radius-sm);
  transition: 
    background var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.modal-close:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
  transform: scale(1.1);
}

.modal-close:active {
  transform: scale(0.9);
}

.modal-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.modal-error {
  min-height: 1.25rem;
  color: var(--error);
  font-size: 0.8rem;
  margin-top: calc(-1 * var(--spacing-sm));
  margin-bottom: var(--spacing-sm);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

/* ============================================
   Error Banner
   ============================================ */
.error-banner {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  max-width: 800px;
  margin: var(--spacing-md) auto;
  padding: var(--spacing-md);
  background: var(--error-soft);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: var(--radius-md);
  color: #FCA5A5;
  font-size: 0.875rem;
}

.error-icon {
  font-size: 1rem;
}

/* ============================================
   Mobile Sidebar Toggle
   ============================================ */
.mobile-sidebar-toggle {
  display: none;
  position: fixed;
  top: var(--spacing-sm);
  right: var(--spacing-md);
  z-index: calc(var(--z-sidebar) + 1);
  width: 40px;
  height: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: 
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.mobile-sidebar-toggle:hover {
  background: var(--surface-hover);
  transform: scale(1.05);
}

.mobile-sidebar-toggle:active {
  transform: scale(0.95);
}

.hamburger {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 100%;
  height: 100%;
}

.hamburger span {
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: 
    transform var(--transition-normal),
    opacity var(--transition-fast);
}

.mobile-sidebar-toggle.active .hamburger span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.mobile-sidebar-toggle.active .hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.mobile-sidebar-toggle.active .hamburger span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ============================================
   Notifications
   ============================================ */
.notifications-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-width: 360px;
  pointer-events: none;
}

.notification {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: notificationSlideIn 0.35s var(--ease-out-expo);
}

.notification-info {
  border-left: 3px solid var(--accent-ai);
}

.notification-warning {
  border-left: 3px solid var(--warning);
}

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

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

.notification-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

.notification-text {
  flex: 1;
  font-size: 0.85rem;
  color: var(--text-primary);
  line-height: 1.5;
}

.notification-close {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: 
    background var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
  flex-shrink: 0;
}

.notification-close:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
  transform: scale(1.1);
}

.notification-close:active {
  transform: scale(0.9);
}

/* ============================================
   Responsive - ИСПРАВЛЕНО
   ============================================ */
@media (max-width: 900px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --sidebar-width: 100%;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    transform: translateX(-100%);
    transition: transform var(--transition-smooth);
  }

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

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(2, 6, 23, 0.7);
    backdrop-filter: blur(4px);
    z-index: var(--z-backdrop);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
  }

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

  .mobile-sidebar-toggle {
    display: flex;
  }

  .main-header {
    padding: var(--spacing-xs) var(--spacing-md);
    padding-right: 56px; /* Место для кнопки меню */
    min-height: 44px;
  }

  .chat-name {
    font-size: 0.85rem;
  }

  .chat-subtitle {
    display: none;
  }

  .header-badges {
    display: none;
  }

  .header-model-switcher {
    display: none;
  }

  .messages {
    padding: var(--spacing-md);
  }

  .chat-controls {
    padding: var(--spacing-xs) var(--spacing-md);
  }
  
  .chat-controls-inner {
    justify-content: center;
    gap: var(--spacing-sm);
  }
  
  .control-label {
    display: none;
  }
  
  .control-select {
    font-size: 0.7rem;
    padding: 0.2rem 1.5rem 0.2rem 0.4rem;
  }

  .composer {
    padding: var(--spacing-sm) var(--spacing-md);
    padding-bottom: max(var(--spacing-md), env(safe-area-inset-bottom));
  }
  
  .composer-main {
    gap: var(--spacing-sm);
  }
  
  .textarea-wrapper textarea {
    min-height: 40px;
    padding: 0.5rem 0.75rem;
    font-size: 16px; /* Предотвращает зум на iOS при фокусе */
  }

  .send-btn {
    min-width: 44px;
    padding: 0 var(--spacing-md);
  }

  .send-btn-text {
    display: none;
  }
  
  .send-btn-icon svg {
    width: 18px;
    height: 18px;
  }
  
  .composer-bottom {
    margin-top: var(--spacing-sm);
  }
  
  .file-input-label {
    padding: 0.35rem 0.7rem;
    font-size: 0.75rem;
  }
  
  .file-input-text {
    display: none;
  }
  
  .selected-file-chip {
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
  }
  
  .selected-file-name {
    max-width: 100px;
  }

  .new-chat-container {
    padding: var(--spacing-md);
    padding-bottom: max(var(--spacing-xl), env(safe-area-inset-bottom));
  }

  .new-chat-card {
    padding: var(--spacing-lg);
  }

  .logout-text {
    display: none;
  }

  .empty-state {
    padding: var(--spacing-lg);
  }
  
  .empty-state-icon {
    font-size: 2rem;
  }
  
  .empty-state-title {
    font-size: 1rem;
  }
  
  .empty-state-text {
    font-size: 0.85rem;
  }
}

/* Для очень маленьких экранов */
@media (max-width: 380px) {
  .composer {
    padding: var(--spacing-xs) var(--spacing-sm);
    padding-bottom: max(var(--spacing-sm), env(safe-area-inset-bottom));
  }
  
  .control-group {
    gap: var(--spacing-xs);
  }
  
  .control-select {
    max-width: 90px;
  }

  .message {
    gap: var(--spacing-sm);
  }

  .avatar {
    width: 28px;
    height: 28px;
    font-size: 0.8rem;
  }

  .bubble {
    padding: var(--spacing-sm) var(--spacing-md);
  }
}

/* ============================================
   iOS-specific fixes
   ============================================ */
@supports (-webkit-touch-callout: none) {
  /* Только для iOS Safari */
  .layout {
    height: -webkit-fill-available;
  }
  
  .main {
    /* Фикс для iOS keyboard */
    max-height: -webkit-fill-available;
  }
}

/* ============================================
   Scrollbar Global
   ============================================ */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-default) transparent;
}

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

button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
select:focus:not(:focus-visible),
textarea:focus:not(:focus-visible) {
  outline: none;
}

/* ============================================
   Utility Classes
   ============================================ */
.text-ai { color: var(--accent-ai); }
.text-gpt { color: var(--model-gpt); }
.text-claude { color: var(--model-claude); }
.text-gemini { color: var(--model-gemini); }

.bg-ai-soft { background: var(--accent-ai-soft); }
.border-ai { border-color: var(--accent-ai-border); }

/* GPU acceleration hints for animated elements */
.sidebar,
.modal-dialog,
.notification,
.chat-item,
.new-chat-card,
.tool-button,
.bubble {
  will-change: auto;
}

/* Active animation state */
.sidebar.open,
.modal-dialog,
.notification {
  will-change: transform, opacity;
}

/* ============ Processing indicator for PDF conversion ============ */

.upload-progress.processing .upload-progress-fill {
  animation: progress-pulse 1.5s ease-in-out infinite;
}

@keyframes progress-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.upload-progress.processing .upload-progress-text {
  color: var(--text-secondary);
}

.processing-indicator {
  display: inline-flex;
  gap: 4px;
  margin-right: 8px;
  vertical-align: middle;
}

.processing-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: processing-bounce 1.4s ease-in-out infinite;
}

.processing-dot:nth-child(1) { animation-delay: 0s; }
.processing-dot:nth-child(2) { animation-delay: 0.2s; }
.processing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes processing-bounce {
  0%, 80%, 100% { 
    transform: scale(0.8);
    opacity: 0.5;
  }
  40% { 
    transform: scale(1.2);
    opacity: 1;
  }
}

/* PDF file badge in file list */
.selected-file-chip.pdf-file {
  border-color: #e74c3c;
}

.selected-file-chip.pdf-file::before {
  content: '📄';
  margin-right: 4px;
}


/* ============================================
   KaTeX / Math Formulas
   ============================================ */

/* Блочные формулы */
.math-block {
  display: block;
  margin: 1rem 0;
  padding: 1rem;
  background: rgba(56, 189, 248, 0.05);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent-ai);
  border-radius: var(--radius-md);
  overflow-x: auto;
  overflow-y: hidden;
}

.math-block .katex-display {
  margin: 0;
  padding: 0;
}

.math-block .katex-display > .katex {
  text-align: left;
}

/* Inline формулы в тексте */
.bubble-content .katex {
  font-size: 1.05em;
  padding: 0 0.1em;
}

/* Fallback стили если KaTeX не загружен */
.math-fallback {
  font-family: 'JetBrains Mono', 'SF Mono', Monaco, Consolas, monospace;
  font-size: 0.9em;
  color: var(--accent-ai);
}

.math-inline.math-fallback {
  padding: 0.1em 0.4em;
  background: var(--surface-hover);
  border-radius: var(--radius-sm);
}

/* Ошибка рендеринга формулы */
.math-error {
  color: var(--warning);
  border-color: var(--warning) !important;
  background: rgba(245, 158, 11, 0.08) !important;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85em;
}

/* Адаптация цветов KaTeX к тёмной теме */
.katex {
  color: var(--text-primary);
}

.katex .mord,
.katex .mbin,
.katex .mrel,
.katex .mopen,
.katex .mclose,
.katex .mpunct,
.katex .minner,
.katex .mop {
  color: inherit;
}

/* Цвета для операторов и переменных */
.katex .katex-html {
  color: var(--text-primary);
}

/* Прокрутка для очень длинных формул */
.math-block .katex-html {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 0.25rem;
}

/* Скроллбар для формул */
.math-block::-webkit-scrollbar {
  height: 4px;
}

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

.math-block::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-full);
}

/* Мобильная адаптация */
@media (max-width: 768px) {
  .math-block {
    padding: 0.75rem;
    margin: 0.75rem 0;
  }
  
  .bubble-content .katex {
    font-size: 0.95em;
  }
}


/* ============================================
   GENERATED IMAGES (от моделей типа GPT-5.2)
   ============================================ */

.generated-image-container {
  position: relative;
  display: inline-block;
  max-width: 100%;
  margin: 12px 0;
  border-radius: 12px;
  overflow: hidden;
  background: #f0f0f0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.generated-image {
  display: block;
  max-width: 100%;
  max-height: 600px;
  width: auto;
  height: auto;
  cursor: zoom-in;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.generated-image:hover {
  transform: scale(1.01);
}

.generated-image-container:hover .image-actions {
  opacity: 1;
  transform: translateY(0);
}

.image-actions {
  position: absolute;
  bottom: 8px;
  right: 8px;
  display: flex;
  gap: 6px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.image-action-btn {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: background 0.2s ease, transform 0.1s ease;
  backdrop-filter: blur(4px);
}

.image-action-btn:hover {
  background: rgba(0, 0, 0, 0.8);
  transform: scale(1.1);
}

.image-error {
  padding: 20px;
  text-align: center;
  color: #666;
  background: #f5f5f5;
  border-radius: 8px;
  font-size: 14px;
}

/* Placeholder пока изображение генерируется */
.image-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 40px 20px;
  background: linear-gradient(135deg, #f0f4f8 0%, #e8ecf0 100%);
  border-radius: 12px;
  margin: 12px 0;
  color: #666;
  font-size: 14px;
}

.image-placeholder-spinner {
  width: 24px;
  height: 24px;
  border: 3px solid #e0e0e0;
  border-top-color: #3b82f6;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ============================================
   IMAGE VIEWER MODAL
   ============================================ */

.image-viewer-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
}

.image-viewer-modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
}

.image-viewer-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(4px);
}

.image-viewer-content {
  position: relative;
  max-width: 95vw;
  max-height: 95vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 1;
}

.image-viewer-close {
  position: absolute;
  top: -40px;
  right: -40px;
  width: 40px;
  height: 40px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-size: 28px;
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.image-viewer-close:hover {
  background: rgba(255, 255, 255, 0.2);
}

.image-viewer-img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.image-viewer-caption {
  margin-top: 12px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 14px;
  text-align: center;
  max-width: 600px;
  line-height: 1.4;
}

.image-viewer-actions {
  margin-top: 16px;
  display: flex;
  gap: 12px;
}

.image-viewer-btn {
  padding: 10px 20px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s ease;
}

.image-viewer-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Mobile */
@media (max-width: 768px) {
  .image-viewer-close {
    top: 10px;
    right: 10px;
  }
  
  .image-viewer-img {
    max-width: 95vw;
    max-height: 70vh;
  }
  
  .image-actions {
    opacity: 1;
    transform: translateY(0);
  }
  
  .generated-image {
    max-height: 400px;
  }
}

/* Dark mode (если используете) */
@media (prefers-color-scheme: dark) {
  .generated-image-container {
    background: #2a2a2a;
  }
  
  .image-placeholder {
    background: linear-gradient(135deg, #2a2a2a 0%, #1a1a1a 100%);
    color: #999;
  }
  
  .image-error {
    background: #2a2a2a;
    color: #999;
  }
}



/* ============================================
   Floating Stop Generation Button
   ============================================ */
.stop-generation-floating {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-bottom: 48px;
  z-index: 10;
  
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  
  transition: 
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    opacity var(--transition-normal);
  
  animation: floatButtonIn 0.3s var(--ease-out-expo);
}

@keyframes floatButtonIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(10px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }
}

.stop-generation-floating:hover {
  background: var(--surface-hover);
  border-color: var(--error);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(239, 68, 68, 0.15);
  transform: translateX(-50%) translateY(-2px);
}

.stop-generation-floating:active {
  transform: translateX(-50%) scale(0.98);
}

.stop-generation-floating:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: translateX(-50%);
}

.stop-generation-floating.stopping {
  pointer-events: none;
}

.stop-generation-floating.stopping .stop-btn-text::after {
  content: 'Останавливаю...';
}

.stop-generation-floating.stopping .stop-btn-text span {
  display: none;
}

.stop-generation-floating .stop-btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  background: var(--error);
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.7rem;
}

.stop-generation-floating .stop-btn-text {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.stop-generation-floating:hover .stop-btn-text {
  color: var(--text-primary);
}

/* Скрываем по умолчанию */
.stop-generation-floating.hidden {
  display: none;
}

/* Fade out animation */
.stop-generation-floating.fade-out {
  animation: floatButtonOut 0.25s var(--ease-in-out) forwards;
}

@keyframes floatButtonOut {
  from {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateX(-50%) translateY(10px) scale(0.95);
  }
}

/* Composer wrapper - нужен для позиционирования */
.composer-wrapper {
  position: relative;
}

/* Убираем старую кнопку из meta сообщения */
.stop-generation-btn {
  display: none !important;
}

/* Status cancelled */
.status-cancelled {
  color: var(--warning);
  font-style: italic;
}

/* Cancelled message styling */
.message[data-status="cancelled"] .bubble {
  border-color: rgba(245, 158, 11, 0.2);
}

.message[data-status="cancelled"] .bubble-content {
  opacity: 0.95;
}

/* Стилизация текста "генерация остановлена" */
.message[data-status="cancelled"] .bubble-content em:last-child,
.message[data-status="cancelled"] .bubble-content p:last-child em {
  display: block;
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px dashed var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Мобильная адаптация */
@media (max-width: 768px) {
  .stop-generation-floating {
    padding: 8px 16px;
    font-size: 0.8rem;
  }
  
  .stop-generation-floating .stop-btn-icon {
    width: 18px;
    height: 18px;
  }
}

/* ============================================
   MARKDOWN РАСШИРЕНИЯ
   ============================================ */

/* Чекбоксы в списках */
.task-list-item {
  list-style: none;
  margin-left: -1.5em;
}

.task-list-item input[type="checkbox"] {
  margin-right: 0.5em;
  width: 1em;
  height: 1em;
  vertical-align: middle;
  accent-color: var(--accent);
}

/* Зачёркнутый текст */
del {
  text-decoration: line-through;
  opacity: 0.7;
}

/* Сноски */
.footnote-ref a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.footnote-ref a:hover {
  text-decoration: underline;
}

.footnotes-sep {
  margin: 2rem 0 1rem;
  border-color: var(--border);
}

.footnotes {
  font-size: 0.9em;
  opacity: 0.85;
}

.footnotes-list {
  padding-left: 1.5em;
}

.footnote-item {
  margin-bottom: 0.5em;
}

.footnote-item p {
  margin: 0;
  display: inline;
}

.footnote-backref {
  color: var(--accent);
  text-decoration: none;
  margin-left: 0.3em;
}

.footnote-backref:hover {
  text-decoration: underline;
}

/* Details/Summary (спойлеры) */
.md-details {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 1em 0;
  background: var(--bg-secondary);
  overflow: hidden;
}

.md-summary {
  padding: 0.75em 1em;
  cursor: pointer;
  font-weight: 500;
  background: var(--bg-tertiary);
  user-select: none;
  display: flex;
  align-items: center;
  gap: 0.5em;
}

.md-summary::before {
  content: '▶';
  font-size: 0.7em;
  transition: transform 0.2s ease;
}

.md-details[open] .md-summary::before {
  transform: rotate(90deg);
}

.md-summary:hover {
  background: var(--bg-hover);
}

.md-details-content {
  padding: 1em;
  border-top: 1px solid var(--border);
}

/* KBD тег */
kbd {
  display: inline-block;
  padding: 0.2em 0.5em;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 2px 0 var(--border);
}

/* Mark (выделение) */
mark {
  background: rgba(255, 230, 0, 0.3);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

/* Underline */
u {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 2px;
}

/* Blockquote улучшения */
blockquote {
  margin: 1em 0;
  padding: 0.75em 1em;
  border-left: 4px solid var(--accent);
  background: var(--bg-secondary);
  border-radius: 0 8px 8px 0;
}

blockquote blockquote {
  margin: 0.75em 0 0 0;
  border-left-color: var(--text-muted);
}

blockquote p {
  margin: 0;
}

blockquote p + p {
  margin-top: 0.5em;
}

/* Вложенные списки */
ul ul,
ul ol,
ol ul,
ol ol {
  margin: 0.25em 0 0.25em 1.5em;
}

/* Таблицы — выравнивание */
table th[style*="text-align: center"],
table td[style*="text-align: center"] {
  text-align: center;
}

table th[style*="text-align: right"],
table td[style*="text-align: right"] {
  text-align: right;
}

/* Abbr (аббревиатуры) */
abbr[title] {
  text-decoration: underline dotted;
  cursor: help;
}



/* Тултип при копировании */
.copy-tooltip {
  position: fixed;
  background: var(--accent);
  color: white;
  padding: 0.4em 0.8em;
  border-radius: 6px;
  font-size: 0.85em;
  font-weight: 500;
  z-index: 10000;
  pointer-events: none;
  animation: tooltipIn 0.2s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.copy-tooltip.fade-out {
  animation: tooltipOut 0.3s ease forwards;
}

@keyframes tooltipIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

@keyframes tooltipOut {
  to {
    opacity: 0;
    transform: translateX(-50%) translateY(-10px);
  }
}

/* Курсор для кликабельного inline code */
code.copyable {
  cursor: pointer;
  transition: background 0.15s ease;
}

code.copyable:hover {
  background: var(--bg-hover);
}

code.copyable:active {
  transform: scale(0.98);
}

/* Курсор для формул */
.math-inline,
.math-block {
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.math-inline:hover,
.math-block:hover {
  opacity: 0.8;
}

/* Definition Lists */
.definition-list {
  margin: 1em 0;
}

.definition-list dt {
  font-weight: 600;
  margin-top: 0.75em;
  color: var(--text-primary);
}

.definition-list dt:first-child {
  margin-top: 0;
}

.definition-list dd {
  margin: 0.25em 0 0.25em 1.5em;
  padding-left: 0.5em;
  border-left: 2px solid var(--accent);
  color: var(--text-secondary);
}