html,
body {
  height: 100%;
  margin: 0;
  display: flex;
  flex-direction: column;
  font-size: 10px; /* base font size */
  background: #fefefe;
  color: #222;
  font-family: "Open Sans", sans-serif;
}

.page {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 745px;
  width: 100%;
  margin: 0 auto;
  padding: 0 20px;
  background: #fefefe;
}

main {
  flex: 1; /* pushes footer to bottom when space available */
}

/*  Navbar - only applies to <nav class="page-nav">  */

nav.page-nav {
  background-color: #f5f5f5;
  padding: 10px 0;
  border-bottom: 1px solid #ddd;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

nav.page-nav ul {
  list-style: none;
  margin: 0;
  padding: 0 20px;
  display: flex;
  justify-content: space-around;
  align-items: center;
}

nav.page-nav li {
  margin: 0;
}

nav.page-nav a {
  font-size: 14px;
  padding: 8px 12px;
  color: #333;
  text-decoration: none;
  border-radius: 4px;
  transition: background 0.2s ease;
}

nav.page-nav a:hover {
  background-color: #e0e0e0;
}

nav.page-nav a.active {
  background-color: #dde8ff; /* soft blue-grey */
  color: #000;
  font-weight: bold;
}

@media (max-width: 600px) {
  nav.page-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5em;
  }

  nav.page-nav a {
    display: block;
    width: 100%;
    padding: 10px 12px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 22px;
  }

  pre.sourceCode {
    font-size: 14px;
  }

  p,
  li {
    font-size: 15px;
    letter-spacing: 0.5px;
  }
}

/*  Footer  */
footer {
  text-align: center;
  padding: 10px;
  border-top: 1px solid black;
  font-size: 13px;
}

footer p {
  font-size: inherit;
  margin: 0;
}

h1 {
  font-size: 35px;
  text-align: center;
}

h2 {
  font-size: 30px;
  text-align: center;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

p,
li {
  font-size: 16px;
  line-height: 2;
  letter-spacing: 1px;
  padding: 5px;
}

li {
  margin: 0;
  padding: 0;
}

img {
  display: block;
  margin: 0 auto;
  max-width: 100%;
}

pre.sourceCode {
  background-color: #f6f8fa;
  padding: 1em;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.9em;
  font-size: 16px;
}

/* Optional for better alignment with KaTeX spacing */
.math.display {
  display: block;
  text-align: center;
  margin: 1.5em 0;
}

.copy-button {
  background: #e0e0e0;
  border: none;
  border-radius: 4px;
  font-size: 0.75em;
  padding: 0.25em 0.5em;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity 0.2s ease-in-out;
  font-size: 12px;
}
.copy-button:hover {
  opacity: 1;
}

figcaption {
  text-align: center;
  font-size: 14px;
  color: #666;
  margin-top: 0.5em;
}

/*  math stuff  */

.math.display {
  display: block;
  text-align: center;
  max-width: 110%;
}

/*  overflow on mobiles  */
@media (max-width: 768px) {
  .math.display {
    overflow-x: auto;
    max-width: 100%;
    padding: 0.5em;
  }

  .math.display > .katex-display {
    overflow-x: auto;
    max-width: 100%;
  }
}