body.overflow-hidden {
  overflow: hidden;
}

#side-menu {
  display: none;
  position: fixed;
  width: 300px;
  top: 0;
  right: -300px;
  height: 100%;
  overflow-y: auto;
  z-index: 1035;
  background: #fff;
  padding: 20px;
  box-shadow: -2px 0 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.4s ease;
}

body.side-menu-visible #side-menu {
  transform: translateX(-300px);
}

#side-menu.side-menu-left {
  right: auto;
  left: -300px;
}

body.side-menu-visible #side-menu.side-menu-left {
  transform: translateX(300px);
}

#side-menu .close {
  position: absolute;
  top: 20px;
  left: 20px;
  font-size: 32px;
  background: none;
  border: none;
  cursor: pointer;
}

#side-menu .contents {
  margin-top: 80px;
}

#side-menu .nav-link {
  display: block;
  font-size: 18px;
  font-weight: 600;
  color: #333;
  padding: 12px 20px;
  text-align: right;
  transition: background 0.2s;
}

#side-menu .nav-link:hover {
  background: #f5f5f5;
}

.side-menu-overlay {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: 1000;
  display: none;
  opacity: 0;
  transition: opacity 0.3s;
}

body.side-menu-visible .side-menu-overlay {
  display: block;
  opacity: 1;
}