h1.thing-title {
  --line-height: 1.33;
  /* Keep the visual gap below the title constant as line-height shrinks */
  margin-bottom: calc(4px + (1.25 - var(--line-height)) * 0.5em);
  line-height: var(--line-height);
}

/* Let the bookmark toggle flow inline as the last "word" of the title so it
   wraps with the text. turbo-frame and button_to's form are block by default,
   so pull the whole chain into the inline flow. */
h1.thing-title turbo-frame,
h1.thing-title .bookmark-toggle form {
  display: inline;
}

h1.thing-title .bookmark-toggle button {
  display: inline-block;
  vertical-align: middle;
}