:root{--bg:#f7f8fa;--surface:#fff;--text:#1f2937;--muted:#4b5563;--link:#345f8a;--border:#d7dee6;--focus:#20476a}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6}.site-shell{flex-direction:column;min-height:100vh;display:flex}.container{width:min(100%,1000px);margin:0 auto;padding:0 1.25rem}.site-header{padding-top:3rem;padding-bottom:1.5rem}h1{margin:0;font-size:clamp(1.85rem,3vw,2.4rem);line-height:1.2}.subheading{color:var(--muted);margin-top:.7rem;font-size:1.06rem}.site-main{flex:1;gap:1rem;padding-bottom:2rem;display:grid}section{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:1.2rem}.section-title{margin:0 0 .5rem;font-size:1.1rem}p{margin:.45rem 0}ul{margin:.4rem 0 0;padding-left:1.2rem}li+li{margin-top:.35rem}a{color:var(--link);text-underline-offset:2px;text-decoration:underline}a:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:2px}.site-footer{border-top:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;gap:.8rem;padding-top:1rem;padding-bottom:2rem;font-size:.95rem;display:flex}@media (max-width:640px){.site-header{padding-top:2rem}section{padding:1rem}.site-footer{flex-direction:column;align-items:flex-start}}