{{-- Public-landing stylesheet — self-contained, no CDN, no build. Every colour and surface reads from CSS variables so the three skins (config/landing_templates .php `vars`) share ONE stylesheet: switching a skin only swaps the variables the wrapper stamps on :root. Brand tints/hovers derive from --lp-brand with color-mix(), so a panel re-brand recolours the whole page with no rebuild. Everything is prefixed .lp / .lp-* and scoped to the .lp page wrapper. --}}