/* Responsive design */
@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 30;
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }

  /* On mobile, collapse mode is ignored */
  .sidebar.is-collapsed {
    width: var(--sidebar-width);
  }
  
  .chat {
    width: 100%;
  }
  
  .btn.icon.sidebar-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
  }
  
  .sidebar-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 25;
  }
  
  .sidebar-backdrop.visible {
    display: block;
  }
  
  .message-column {
    padding: 0 var(--space-lg);
  }
  
  .composer {
    padding: var(--space-lg);
  }
  
  .hero-composer {
    padding: 0 var(--space-lg);
    max-width: none;
  }
}

@media (max-width: 600px) {
  .chat-header {
    padding: 0 var(--space-lg);
  }
  
  .message-column {
    padding: 0 var(--space-md);
  }
  
  .composer {
    padding: var(--space-md);
  }
  
  .hero-composer {
    padding: 0 var(--space-md);
  }
  
  .bubble {
    max-width: 95%;
  }
  
  .cards {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }
  
  .page-footer {
    flex-direction: column;
    gap: 0;
    padding: 8px 12px;
  }
  
  .footer-content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-sm);
    width: 100%;
  }
  
  .footer-disclaimer {
    flex: 0 1 auto;
    text-align: center;
    font-size: 11px;
    line-height: 1.4;
    order: 2;
  }
  
  .footer-version-mobile {
    display: block;
    font-size: 11px;
    order: 1;
    flex-shrink: 0;
  }
  
  .footer-about-link {
    display: inline;
    font-size: 11px;
  }
  
  /* Hide fixed version link on mobile */
  .version-link {
    display: none;
  }
  
  /* Hide registration button on mobile, keep only login button small */
  .header-auth-buttons a.btn.ghost.header-btn {
    display: none;
  }
  
  .header-auth-buttons a.btn.primary.header-btn {
    padding: 6px 12px;
    font-size: 13px;
  }
  
  /* Make "Тарифы" and "Как это работает" buttons smaller on mobile */
  .chat-header .left a.btn.ghost.header-btn {
    padding: 6px 12px;
    font-size: 13px;
  }
  
  /* Show compose icon in header on mobile */
  .header-compose-icon {
    display: inline-flex !important;
  }
  
  /* Make header compose icon same height as other header buttons on mobile */
  .chat-header .header-compose-icon.btn.icon {
    padding: 6px !important;
    min-height: auto !important;
    height: auto !important;
    margin-bottom: 0 !important;
    margin-top: 0 !important;
    align-items: center;
    line-height: 1;
  }
  
  .chat-header .header-compose-icon.btn.icon img {
    display: block;
    margin: 0;
  }
  
  /* Adjust spacing in header right section on mobile */
  .chat-header .right {
    gap: var(--space-sm);
  }
}