:root{color-scheme:light dark;font-family:system-ui,sans-serif;line-height:1.65;background:light-dark(#f6f7fa,#11161f);color:light-dark(#202a39,#e4eaf3)}*{box-sizing:border-box}body{margin:0}main{max-width:52rem;padding:clamp(1.25rem,5vw,3rem);margin:auto}h1{line-height:1.15;font-size:clamp(2rem,5vw,2.75rem);margin:.4rem 0 1rem}h2{line-height:1.3;font-size:1.2rem;margin:0}h3{line-height:1.35}.eyebrow{font-size:.85rem;letter-spacing:.08em;text-transform:uppercase}.hint,.intro{color:light-dark(#46546a,#b6c3d5)}.expandable{margin:1.5rem 0;border:1px solid light-dark(#bac9db,#42516a);border-radius:.8rem;overflow:hidden;background:light-dark(#fff,#192332)}.expandable header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem;padding:1rem 1.25rem}.preview{padding:0 1.25rem 1rem}.preview>:first-child{margin-top:.5rem}button{font:inherit;font-weight:600;padding:.5rem .9rem;min-height:44px;border:1px solid light-dark(#405c86,#89addd);border-radius:.4rem;background:light-dark(#eaf1fb,#253b5c);color:inherit;cursor:pointer}button:hover{background:light-dark(#dae7fa,#304d76)}a:focus-visible,button:focus-visible{outline:3px solid light-dark(#375fad,#9abfff);outline-offset:4px}a{color:light-dark(#245a9d,#a9cdff);text-underline-offset:.18em}nav{display:flex;gap:.7rem 1.5rem;flex-wrap:wrap;margin-top:1.5rem}[hidden]{display:none!important}