:root{--bg:#273e81;--cube-bg-rgb:255,212,0;--cube-alpha:0.70;--cube-text:#000;--face-padding:12px}*{box-sizing:border-box}body,html{height:100%;margin:0;background:var(--bg);overflow:hidden;font-family:var(--font-black-han-sans),var(--font-black-han-sans),system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans KR",Arial,sans-serif}