:root{--container-sm: 640px;--container-md: 960px;--container-lg: 1200px;--shell-max: var(--container-lg);--card-max: 480px;--h-pad: 16px;--header-h: 0px;--safe-top: env(safe-area-inset-top);--safe-right: env(safe-area-inset-right);--safe-bottom: env(safe-area-inset-bottom);--safe-left: env(safe-area-inset-left);--fs-14: 14px;--fs-16: 16px}