.shell {
  position: relative;
  height: 100dvh;
  display: flex;
  background: var(--color-bg);
}

.main {
  flex: 1;
  min-width: 0;
  overflow-y: auto;
}

/* The bottom bar overlays the last 94 px of the screen (plus the safe area),
   so the scroll area reserves at least 100 px beneath its content. */
.mobile .main {
  padding: 0 20px;
  padding-bottom: calc(100px + env(safe-area-inset-bottom));
}

.tablet .main,
.desktop .main {
  padding: 32px 36px;
}

/* An upright tablet (820 px wide) leaves 724 px beside the rail; slimmer side
   padding gives the page a little more of it. */
.tablet.portrait .main {
  padding: 32px 28px;
}