/* Paso 8.70/8.72: desktop/laptop primero — sidebar + header + main en
   grid, con un breakpoint razonable de tablet. */
#app {
  display: grid;
  grid-template-columns: 220px 1fr;
  grid-template-rows: 56px 1fr;
  grid-template-areas:
    "sidebar header"
    "sidebar main";
  min-height: 100vh;
}

#sidebar {
  grid-area: sidebar;
  background: var(--surface);
  border-right: 1px solid var(--surface-border);
  padding: var(--space-4) var(--space-3);
}

#sidebar .brand {
  font-weight: 700;
  margin-bottom: var(--space-5);
  color: var(--brand-primary);
}

#sidebar nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

#sidebar nav a {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  text-decoration: none;
}

#sidebar nav a:hover,
#sidebar nav a[aria-current="page"] {
  background: var(--surface-alt);
  color: var(--brand-primary);
}

#header {
  grid-area: header;
  background: var(--surface);
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
}

#header .user-name {
  color: var(--text-secondary);
  font-size: 13px;
}

#page-root {
  grid-area: main;
  padding: var(--space-5);
  overflow: auto;
}

@media (max-width: 900px) {
  #app {
    grid-template-columns: 72px 1fr;
  }

  #sidebar .brand,
  #sidebar nav a span.label {
    display: none;
  }
}