/* ===========================
   SIDEBAR 
   =========================== */
.sidebar {
  position: fixed;
  top: 60px;
  left: 0;
  width: 250px;
  height: calc(100% - 60px);
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  z-index: 999;
  background-color: var(--sidebar-bg);
  color: var(--link-color); /* text */
  padding: 20px;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.2);
  overflow-y: auto;
}
.sidebar.visible {
  transform: translateX(0);
}
.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sidebar li {
  margin: 12px 0;
  padding: 0;
}
.sidebar li:first-child {
  margin-top: -4px;
}
.sidebar a {
  display: block;
  padding: 12px 16px;
  background-color: var(--box-bg);
  border-radius: 8px;
  text-decoration: none;
  color: var(--sidebar-text);
  font-size: 1rem;
  line-height: 1.5;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
  transition: background-color 0.2s ease, transform 0.2s ease;
}
.sidebar a:hover,
.sidebar a:focus {
  background-color: var(--hover-bg);
  transform: translateX(2px);
}
.sidebar a.active {
  background-color: var(--hover-bg);
  font-weight: bold;
  border-left: 4px solid var(--hover-bg);
}

/* ===========================
   SIDEBAR OVERLAY
   =========================== */
#sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.4);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(4px); /* Optional*/
}
.sidebar.visible + #sidebar-overlay {
  opacity: 1;
  visibility: visible;
}