:root {
  --menu-width-collapsed: 80px;
  --menu-width-expanded: 260px;
  --bg-glass: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 0.2);
  --shadow: rgba(0, 0, 0, 0.5);
  --text: #fff;
  --hover: rgba(255, 255, 255, 0.15);
  --radius: 24px;
  --transition: 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}



/* Menü Container */
.menu {
  position: fixed;
  top: 20px;
  left: 20px;
  bottom: 20px;
  width: var(--menu-width-collapsed);
  background: var(--bg-glass);
  border-radius: var(--radius);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(15px) saturate(140%);
  box-shadow: 0 10px 40px var(--shadow), inset 0 1px 0 rgba(255,255,255,0.1);
  transition: width var(--transition), box-shadow var(--transition);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  z-index: 1000;
}

/* Menü aufklappen beim Hover */
.menu:hover {
  width: var(--menu-width-expanded);
  box-shadow: 0 20px 60px rgba(0,0,0,0.7);
}

.menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
  flex: 1;                /* nimmt die volle Höhe ein */
  display: flex;          /* macht es zu einem Flex-Container */
  flex-direction: column; /* Anordnung untereinander */
  justify-content: center;/* vertikal zentrieren */
  align-items: flex-start;/* horizontal links lassen (Icons/Text) */
}

.menu li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  margin: 8px;
  border-radius: 16px;
  cursor: pointer;
  color: var(--text);
  transition: background var(--transition), transform 0.3s ease;
  
}

.menu li:hover {
  background: var(--hover);
  transform: translateX(6px);
}

.menu li svg {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.menu li span {
  opacity: 0;
  white-space: nowrap;
  transition: opacity var(--transition);
}

.menu:hover li span {
  opacity: 1;
}

/* Aktiver Menüpunkt */
.menu li.active {
  background: rgba(255,255,255,0.25);
  font-weight: bold;
}

/* Desktop only */
@media(max-width: 1024px) {
  .menu { display: none; }
}