/* Safer defaults for varied EPUB engines (Kindle, iBooks, KOReader, etc.) */

html, body {
  margin: 0;
  padding: 0.8em;
  line-height: 1.55;
  widows: 2;
  orphans: 2;
}

/* Avoid fonts that may not exist on the device */
body {
  font-family: serif;
  color: #111;
}

/* Headings */
h1, h2, h3 {
  font-family: serif;
  font-weight: 700;
  margin: 1.2em 0 0.5em 0;
}

h1 { font-size: 1.6em; }
h2 { font-size: 1.3em; }
h3 { font-size: 1.1em; }

/* Lists and paragraphs */
p { margin: 0.7em 0; }
ul, ol { margin: 0.7em 0 0.7em 1.2em; }

/* Images */
img { max-width: 100%; height: auto; }

/* Page breaks for supported readers */
section[epub|type="titlepage"] {
  break-after: page;
  page-break-after: always; /* fallback */
}
section#pubmeta {
  break-after: page;
  page-break-after: always;
}

/* Callouts (match HTML look, keep it minimal for EPUB) */
.callout-established,
.callout-proposed,
.callout-speculative {
  padding: 0.6em;
  margin: 0.7em 0;
  border-left: 0.35em solid;
  background: #fefefe;
}

.callout-established { border-color: #3a8d3a; background: #e8f7e8; }
.callout-proposed    { border-color: #3b6dd8; background: #e8f0ff; }
.callout-speculative { border-color: #8b2be2; background: #f7e8ff; }

/* First bold line inside a callout = title */
.callout-established p:first-child strong,
.callout-proposed p:first-child strong,
.callout-speculative p:first-child strong {
  display: block;
  margin-bottom: 0.3em;
}

/* Math (MathML) spacing */
.math.display { margin: 0.8em 0; }

/* Blockquotes */
blockquote {
  border-left: 0.25em solid #bbb;
  padding-left: 0.8em;
  color: #444;
}