.platform-shell {
  min-height: 100vh;
  background: var(--bg);
}

.platform-topbar-spacer {
  height: var(--topbar-height);
}

.platform-main {
  width: min(var(--shell-max-width), calc(100% - 24px));
  margin: 0 auto;
  padding: 12px 0 20px;
}

.hub-shell {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

@media (max-width: 980px) {
  .hub-shell {
    grid-template-columns: 1fr;
  }
}