style.css

/* Global light-mode baseline */
:root {
  --radius: 0.75rem;
}

/* Simple scrollbar for messages area */
#messages::-webkit-scrollbar {
  width: 10px;
}
#messages::-webkit-scrollbar-thumb {
  background: #e5e7eb;
  border-radius: 9999px;
}
#messages {
  scrollbar-width: thin;
  scrollbar-color: #e5e7eb transparent;
}

/* Message bubbles */
.message {
  display: flex;
  gap: 12px;
  max-width: 860px;
}
.message .avatar {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  color: white;
}
.message.user .avatar {
  background: linear-gradient(135deg, #0ea5e9, #6366f1);
}
.message.assistant .avatar {
  background: linear-gradient(135deg, #22c55e, #14b8a6);
}
.message .bubble {
  border: 1px solid #e5e7eb;
  background: white;
  padding: 12px 14px;
  border-radius: 14px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}
.message.assistant .bubble {
  background: #f8fafc;
}

/* Mobile sidebar overlay */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  z-index: 40;
}
.mobile-sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 80%;
  max-width: 320px;
  background: white;
  z-index: 50;
  transform: translateX(-100%);
  transition: transform 0.25s ease-in-out;
}
.mobile-sidebar.open {
  transform: translateX(0);
}
@media (min-width: 768px) {
  .mobile-overlay, .mobile-sidebar {
    display: none !important;
  }
}

/* Buttons subtle hover */
.btn {
  transition: background 120ms ease-in-out, border-color 120ms ease-in-out;
}

/* Small utilities */
.small-muted {
  font-size: 12px;
  color: #6b7280;
}