/* Sticky header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 1000; /* above content */
  background: var(--color-surface, #0c1220);
}

/* Layout container uses CSS grid */
.app-container {
  display: grid;
  grid-template-columns: auto 1fr; /* sidebar + content */
  gap: 0;
  min-height: calc(100vh - 64px); /* adjust if header height differs */
  background: lime;
}

/* Sticky sidebar */
.sidebar {
  position: sticky;
  top: var(--header-height, 64px);
  align-self: start;
  height: calc(100vh - var(--header-height, 64px));
  overflow: auto;            /* sidebar scrolls independently if long */
  padding-bottom: var(--space-6);
  z-index: 999;
  background: var(--color-surface, #0c1220);
  border-right: 1px solid var(--color-border, rgba(255,255,255,0.08));
}

/* Main content scrolls; prevents whole-page scroll jumps */
.main-content {
  height: calc(100vh - var(--header-height, 64px));
  overflow: auto;
  padding: var(--space-6);
}

/* Optional: make bottom mobile nav stay above content */
.bottom-nav {
  position: sticky;
  bottom: 0;
  z-index: 1000;
}