/* ── SHARED SIDEBAR STYLES ── */
.sidebar {
  width: var(--sidebar-w); background: var(--sidebar-bg); display: flex; flex-direction: column;
  flex-shrink: 0; transition: width 250ms ease; overflow: hidden; position: relative; z-index: 100;
}
.sidebar.collapsed { width: var(--sidebar-collapsed); }

/* Header */
.sidebar-header {
  display: flex; align-items: center; gap: 10px; padding: 0 16px;
  height: 64px; flex-shrink: 0; border-bottom: 1px solid rgba(255,255,255,0.08);
  position: relative;
}
.att-logo { flex-shrink: 0; display: flex; align-items: center; gap: 10px; overflow: hidden; }
.att-logo-globe { flex-shrink: 0; width: 32px; height: 32px; }
.att-logo-wordmark { color: white; font-weight: 700; font-size: 18px; letter-spacing: 0.5px;
  white-space: nowrap; opacity: 1; transition: opacity 200ms, width 200ms; }
.sidebar.collapsed .att-logo-wordmark { opacity: 0; width: 0; overflow: hidden; }

/* Toggle button */
.sidebar-toggle {
  position: absolute; top: 50%; transform: translateY(-50%); right: -13px;
  width: 26px; height: 26px; background: #fff; border: none; border-radius: 6px;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  color: #0052CC; z-index: 101; box-shadow: 0 1px 4px rgba(0,0,0,0.25);
  transition: background 150ms;
}
.sidebar-toggle:hover { background: #f0f4ff; }
.sidebar-toggle svg { transition: transform 250ms; flex-shrink: 0; }
.sidebar.collapsed .sidebar-toggle svg { transform: scaleX(-1); }

/* Nav */
.sidebar-nav { flex: 1; overflow-y: auto; overflow-x: hidden; padding: 8px 0; }
.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 0 14px; height: 42px;
  color: var(--sidebar-text); cursor: pointer; white-space: nowrap; transition: background 150ms;
  text-decoration: none; font-size: 13px; font-weight: 500; position: relative; border: none;
  background: none; width: 100%; text-align: left; font-family: var(--font);
}
.nav-item:hover { background: rgba(255,255,255,0.06); }
.nav-item.active { background: rgba(0,82,204,0.18); border-left: 3px solid #0052CC; padding-left: 11px; color: #0052CC; }
.nav-item.section-active { background: rgba(0,82,204,0.10); }

.nav-item-icon {
  width: 20px; height: 20px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  color: rgba(235,235,235,0.6);
}
.nav-item.active .nav-item-icon { color: #0052CC; }
.nav-item.section-active .nav-item-icon { color: rgba(235,235,235,0.85); }

.nav-item-text { flex: 1; transition: opacity 200ms; white-space: nowrap; }
.sidebar.collapsed .nav-item-text { opacity: 0; width: 0; overflow: hidden; }

.nav-chevron {
  width: 14px; height: 14px; flex-shrink: 0;
  transition: transform 250ms, opacity 200ms; color: var(--sidebar-sub);
}
.sidebar.collapsed .nav-chevron { opacity: 0; }
.nav-item.open .nav-chevron { transform: rotate(90deg); }

/* Submenu */
.nav-submenu { overflow: hidden; max-height: 0; transition: max-height 300ms ease; }
.nav-submenu.open { max-height: 400px; }
.sidebar.collapsed .nav-submenu { max-height: 0; }

.nav-sub-item {
  display: flex; align-items: center; padding: 0 14px 0 44px; height: 34px;
  color: var(--sidebar-sub); cursor: pointer; white-space: nowrap; font-size: 12px;
  font-weight: 500; text-decoration: none; transition: background 150ms, color 150ms;
}
.nav-sub-item:hover { background: rgba(255,255,255,0.04); color: var(--sidebar-text); }
.nav-sub-item.active { color: #0052CC; background: rgba(0,82,204,0.1); }
.sidebar.collapsed .nav-sub-item { display: none; }

/* Submenu group label */
.nav-sub-label {
  display: flex; align-items: center; padding: 6px 14px 2px 44px;
  color: rgba(130,139,145,0.7); font-size: 10px; font-weight: 600;
  text-transform: none; letter-spacing: 0.3px; white-space: nowrap;
}
.sidebar.collapsed .nav-sub-label { display: none; }
.nav-sub-item--child { padding-left: 56px; }

/* Nested sub-toggle (Reports Management, User Management) */
.nav-sub-toggle {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; user-select: none;
  padding-right: 14px;
}
.nav-sub-toggle:hover { background: rgba(255,255,255,0.06); }
.nav-sub-chevron {
  width: 12px; height: 12px; flex-shrink: 0;
  transition: transform 0.2s;
}
.nav-sub-toggle.open .nav-sub-chevron { transform: rotate(90deg); }

/* Nested sub-submenu */
.nav-sub-submenu { display: none; }
.nav-sub-submenu.open { display: block; }
.sidebar.collapsed .nav-sub-toggle,
.sidebar.collapsed .nav-sub-submenu { display: none; }

/* Footer */
.sidebar-footer { border-top: 1px solid rgba(255,255,255,0.08); padding: 8px 0; }