@layer legacy {
/* Viewport correctness is independent of the optional chat appearance layer. */
.app {
  position: fixed;
  inset: auto 0;
  top: var(--visual-top, 0px);
  width: 100%;
  height: var(--visual-vh, 100dvh);
  min-height: 0;
  overflow: hidden;
  transform: none;
}
.app .main { min-height: 0; overflow: hidden; }
.app .content { min-height: 0; flex: 1 1 0; scroll-padding-bottom: 24px; }
.app .main .composer-shell {
  position: relative;
  inset: auto;
  flex: 0 0 auto;
  width: 100%;
  padding-top: 10px;
  background: var(--bg);
}
.app .chat-stage, body.keyboard-open .app .chat-stage { padding-bottom: 24px; }
.app .chat-stage:has(.empty) { padding-block: 16px; }
.app .empty { min-height: min(560px, calc(var(--visual-vh, 100dvh) - 260px)); }
.app .prompt { max-height: min(160px, calc(var(--visual-vh, 100dvh) * .28)); overflow-y: auto; }
body.keyboard-open .app .topbar { height: 48px; flex-basis: 48px; }
body.keyboard-open .app .composer-shell { padding-top: 6px; padding-bottom: max(6px, env(safe-area-inset-bottom)); }
body.keyboard-open .app .composer { padding: 6px 8px; border-radius: 14px; }
body.keyboard-open .app .input-row { display: grid; grid-template-columns: 40px 40px minmax(0, 1fr) 40px; gap: 4px; align-items: end; }
body.keyboard-open .app .input-row .prompt { grid-row: 1; grid-column: 3; min-height: 40px; padding: 8px 4px; font-size: 16px; }
body.keyboard-open .app .input-row .attach { grid-row: 1; grid-column: 1; }
body.keyboard-open .app .input-row .web-search { grid-row: 1; grid-column: 2; }
body.keyboard-open .app .input-row .send { grid-row: 1; grid-column: 4; }
body.keyboard-open .app .circle-btn { width: 40px; height: 40px; min-width: 40px; min-height: 40px; }
body.keyboard-open .app .empty { min-height: 0; padding: 16px 0; }
.overlay { top: var(--visual-top, 0px); bottom: auto; height: var(--visual-vh, 100dvh); padding: 16px; box-sizing: border-box; }
.overlay .modal { min-height: 0; max-height: calc(var(--visual-vh, 100dvh) - 32px); min-width: 0; overscroll-behavior: contain; }
.modal input:not([type=checkbox]):not([type=radio]), .modal textarea, .modal select { font-size: 16px; }
.api-doc-endpoint code, .file-pill span, .profile-copy { min-width: 0; overflow-wrap: anywhere; }
@media (pointer: coarse) {
  .chat-menu { opacity: 1; width: 36px; height: 36px; }
  .history .chat-row { min-height: 44px; padding-right: 42px; }
  .icon-btn { min-width: 44px; min-height: 44px; }
}
@media (max-width: 760px) {
  .overlay { padding: 8px; }
  .overlay .modal { width: 100%; max-height: calc(var(--visual-vh, 100dvh) - 16px); }
  .app .chat-stage { width: 100%; padding-inline: 16px; }
  .app .message.assistant .bubble { min-width: 0; }
}

}