body {
  max-width: 40em;          /* comfortable reading width */
  margin: 0 auto;           /* center the content */
  padding: 2.5em 2.5em;       /* top/bottom 2.5em, left/right 2em */
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h4 {
  margin-bottom: 0;   /* very small space under the title */
  padding-bottom: 0;
}
h4 + p {
  margin-top: 0;           /* remove the default top margin of the paragraph */
  padding-top: 0;
}

section.level5 {
  margin: 1em 0;                  /* ← the fix: blank-line gap between h5 groups */
}
section.level5 h5 {
  display: inline;                /* keep run-in: title flows into body    */
  margin: 0;
  font-size: inherit;
  font-weight: bold;
}
section.level5 h5::after {
  content: "：";             /* keep the "：" + thin space separator   */
  /*content: "：\2009";             /* keep the "：" + thin space separator   */
}
section.level5 h5 + p {
  display: inline;                /* keep body on the same line as title   */
  margin-right: 0;
}

div.inline-note { font-size: 0.9em; color: #444; margin: 0.3em 0 0.2em 1.5em; }
div.inline-note p { margin: 0; }