.content h1, h2, h3, h4, h5, h6 {
  line-height: 1em;
  margin-bottom: -0.5em;
}

h1 {
  color: var(--accent);
}

.content h1 {
  color: var(--accent);
  margin-top: 1.85em;
}

.menu, .submenu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 2px;
  padding-bottom: 2px;
  border-bottom: 1px solid;
  border-top: 1px solid;
}

.menu > li {
  position: relative;
}

.menu > li > a {
  text-decoration: none;
  font-weight: bold;
}

.menu > li:hover > a {color: var(--foreground)}

.menu > li:hover > .submenu {
  display: block;
}

.submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  color: var(--foreground);
  background-color: var(--background);
  box-shadow: 0 8px 12px var(--background);
  border: 1px solid;
  padding: 0.5em;
  white-space: nowrap;
  z-index: 100;    /* Ensure submenus are in the foreground. */
}

.submenu li {
  margin: 0;
}

.submenu a {
  display: block;
  padding: 0.3em 0.6em;
  text-decoration: none;
  color: var(--foreground);
}

.submenu a:hover {
  text-decoration: underline;
}

.menu > li > a.active, .submenu a.active {
  background-color: var(--accent);
  color: var(--background);
  padding: 0.2em 0.4em;
  border-radius: 0.3em;
}

footer {
  margin-top: 2rem;
  border-top: 1px solid var(--foreground);
  padding-top: 1rem;
  font-size: 0.9rem;
  text-align: center;
}

.site-map ul { list-style: none; padding-left: 1em; }
.site-map li::before { content: "› "; color: var(--accent); }
.site-map a { color: var(--accent); text-decoration: none; }
.site-map a:hover { text-decoration: underline; }


video {
  width: 100%;
  height: auto;
  display: block;
  z-index: 10;    /* Ensure videos are behind submenus. */
}