/* App Shell */
#app    { display: flex; min-height: 100vh; }
#main   { flex: 1; margin-left: 220px; display: flex; flex-direction: column; }
#content { padding: 24px; flex: 1; max-width: 1100px; }

/* Topbar */
#topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Sidebar */
#sidebar {
  width: 220px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  z-index: 100;
}
.sidebar-logo    { padding: 16px; font-size: 17px; font-weight: 700; color: var(--primary); border-bottom: 1px solid var(--border); }
.sidebar-section { padding: 12px 8px 4px; font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); font-weight: 600; }
.sidebar-bottom  { margin-top: auto; padding: 12px; border-top: 1px solid var(--border); }

.nav-item { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: var(--radius); cursor: pointer; color: var(--text); font-size: 14px; margin: 1px 8px; }
.nav-item:hover  { background: var(--bg); }
.nav-item.active { background: #eff6ff; color: var(--primary); font-weight: 500; }

.user-info          { font-size: 13px; padding: 4px 0 8px; color: var(--text-muted); }
.user-info strong   { color: var(--text); display: block; }