:root {
  --nav-width: 250px;
  --button-width: 50px;
  --transition-speed: 0.3s;
  --bg-color: #1e1e2f;
  --highlight-color: #4fc3f7;
  --text-color: #fff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  height: 100vh;
  overflow: hidden;
  display: flex;
}

#nav-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: calc(var(--nav-width) + var(--button-width));
  display: flex;
  transition: transform var(--transition-speed);
  z-index: 2;
}

#nav-wrapper.collapsed {
  transform: translateX(calc(-1 * var(--nav-width)));
}

#main-nav {
  position: relative;
  display: flex;
  flex-direction: column;
  width: var(--nav-width);
  background-color: var(--bg-color);
  color: var(--text-color);
  padding: 1em;
  overflow: hidden;
}

#main-nav h1 {
  margin-top: 0;
  margin-bottom: 0;
  padding-left: 0.25em;
}

#main-nav span {
  padding-left: 0.7em;
  font-size: 0.8em;
}

#main-nav ul {
  list-style: none;
  padding-left: 0.5em;
}

#main-nav li {
  margin: 0.5em 0;
  cursor: pointer;
}

#main-nav a {
  color: var(--text-color);
  text-decoration: none;
}

#main-nav a:hover {
  color: var(--highlight-color);
}

#button-container {
  width: var(--button-width);
  background: transparent;
  display: flex;
  flex-direction: column;
  justify-content: start;
  align-items: stretch;
  padding-top: 10px;
  gap: 5px;
}

#toggle-button,
#refresh-button {
  width: var(--button-width);
  height: 40px;
  background-color: var(--highlight-color);
  border: none;
  color: #000;
  font-weight: bold;
  cursor: pointer;
  border-radius: 0 6px 6px 0;
  transition: background-color var(--transition-speed);
}

#toggle-button:hover,
#refresh-button:hover {
  background-color: #81d4fa;
}

main {
  flex: 1;
  display: flex;
  align-items: stretch;
  z-index: 1;
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
}

#menu-content {
  flex: 1;
  overflow-y: auto;
  margin-top: 1em;
  margin-bottom: 3em; /* Platz für Footer */
}

.menu-footer {
  position: absolute;
  bottom: 1em;
  left: 1em;
  right: 1em;
  font-size: 0.75em;
  color: #aaa;
  text-align: center;
  border-top: 1px solid #444;
  padding-top: 1em;
  background-color: var(--bg-color);
}

.menu-toggle {
  font-weight: bold;
  cursor: pointer;
  padding: 0.25em;
  transition: background-color 0.2s ease;
}

.menu-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

#main-nav li > ul {
  display: none;
  margin-left: 1em;
}

#main-nav li.open > ul {
  display: block;
}

#main-nav li.open > .menu-toggle::after {
  content: " ▼";
}

#main-nav li > .menu-toggle::after {
  content: " ▶";
  font-size: 0.8em;
}