#side-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  height: 100dvh;
  width: var(--sidebar-width); /* Narrow state */
  background: var(--bg-paper);
  border-right: 1px solid var(--glass-border);
  box-shadow: var(--paper-shadow);
  transition:
    width 0.3s cubic-bezier(0.4, 0, 0.2, 1),
    top 0.3s cubic-bezier(0.4, 0, 0.2, 1),
    height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 200000; /* High priority (Ads are 99999) */
  display: flex;
  flex-direction: column;
  overflow: visible; /* Allow dropdowns to pop out */
  will-change: top, height, width;
}

#side-sidebar.expanded {
  width: var(--sidebar-expanded-width);
}

/* Toggle Buttons (Shared logic) */
.sidebar-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.2s;
  z-index: 30001;
}

.sidebar-toggle:hover {
  background: var(--bg-secondary);
}

.sidebar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: all 0.3s;
}

/* Hamburger Animation (Linked to body state) */
body.sidebar-expanded .sidebar-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
body.sidebar-expanded .sidebar-toggle span:nth-child(2) {
  opacity: 0;
}
body.sidebar-expanded .sidebar-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Container Logic */
.desktop-toggle-container {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  width: var(--sidebar-width);
  height: var(--header-height-condensed);
}

/* Sidebar Body (Content Area) */
.sidebar-content {
  flex: 1;
  padding: calc(var(--header-height-condensed) + 10px) 0 10px; /* Clear fixed toggle */
  display: flex;
  flex-direction: column;
}

.sidebar-section-label {
  padding: 0 10px;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  margin-bottom: 10px;
  font-weight: 700;
  opacity: 0;
  transition: opacity 0.2s;
}

#side-sidebar.expanded .sidebar-section-label {
  opacity: 1;
}

.sidebar-nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-item {
  display: flex;
  align-items: center;
  height: 50px;
  padding: 0 10px;
  cursor: pointer;
  transition: background 0.2s;
  gap: 10px;
  width: 100%;
  overflow: hidden; /* Clip hover background and hidden labels */
}

.nav-item:hover {
  background: var(--bg-secondary);
}

.nav-icon {
  font-size: 1.4rem;
  min-width: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.nav-label {
  font-weight: 500;
  font-size: 1rem;
  opacity: 0;
  transform: translateX(-10px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  pointer-events: none;
  /* Don't affect parent width when collapsed */
  width: 0;
  display: inline-block;
}

#side-sidebar.expanded .nav-label {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
  width: auto;
}

/* Sidebar Footer */
.sidebar-footer {
  margin-top: auto; /* Push to bottom */
  padding-bottom: 20px;
  position: relative; /* Context for nested dropdowns to align to footer bottom */
}

.sidebar-footer .dropdown-divider {
  margin: 10px 0; /* Full width with padding handled by the sidebar itself */
  width: 100%;
  border-top: 1px solid var(--glass-border);
  box-sizing: border-box;
}

/* Dark Mode override if needed (most handled by vars) */
body.dark-mode #side-sidebar {
  background: var(--bg-paper);
}

/* Sidebar Overlay (Backdrop) - MOBILE ONLY */
#sidebar-overlay {
  display: none; /* Hidden on Desktop */
}
.mobile-toggle-container {
  display: none; /* Hide mobile-header toggle on Desktop */
}

@media (max-width: 768px) {
  :root {
    --sidebar-expanded-width: 280px; /* Wider for better mobile touch/reading and Account menu fit */
  }

  #sidebar-overlay {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100dvh;
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(2px);
    z-index: 199999; /* Below sidebar but above ads (99999) */
    transition:
      opacity 0.3s,
      visibility 0.3s;
  }

  #sidebar-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }

  #side-sidebar {
    width: var(--sidebar-expanded-width);
    transform: translateX(-100%);
    box-shadow: none;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1); /* Dedicated transform transition */
  }

  #side-sidebar.expanded {
    transform: translateX(0);
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.2);
  }

  .mobile-toggle-container {
    display: flex; /* Show the top header toggle when on mobile! */
  }
  .desktop-toggle-container {
    display: none; /* Hide the sidebar toggle when on mobile to avoid duplication */
  }
}