:root{--page-background:linear-gradient(180deg, #f4f4f5 0%, #fafaf9 100%);--surface:#fffffff0;--border:#18181b1f;--ink:#18181b;--muted:#52525b}*{box-sizing:border-box}body{background:var(--page-background);min-height:100vh;color:var(--ink);margin:0;font:16px/1.5 IBM Plex Sans,system-ui,sans-serif}main{width:min(1100px,100vw - 32px);margin:0 auto;padding:32px 0 48px}header{border:1px solid var(--border);background:var(--surface);border-radius:20px;margin-bottom:24px;padding:24px}h1,h2{margin:0 0 8px}p{color:var(--muted);margin:0}section{border:1px solid var(--border);background:var(--surface);border-radius:20px;margin-top:20px;padding:20px}.stack{gap:20px;display:grid}