*,*::before,*::after{box-sizing:border-box}html,body{margin:0;min-height:100%}body{font-family:system-ui,sans-serif}.app-shell,.color-stage{min-height:100vh}.color-stage{display:grid;place-items:center;background:var(--stage-color, #ffcc88)}.control-panel{display:grid;gap:1rem;padding:1.25rem;border-radius:1rem;background:hsla(0,0%,100%,.75);backdrop-filter:blur(16px);box-shadow:0 1rem 3rem rgba(0,0,0,.16)}