:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color-scheme:light}*{box-sizing:border-box}html,body{margin:0;padding:0;background:#f9fafb;color:#1f2937;min-height:100vh}.shell{max-width:960px;margin:0 auto;padding:2rem 1.25rem}.shell__header{border-bottom:1px solid #e5e7eb;padding-bottom:1.25rem}.shell__title{font-size:1.5rem;font-weight:600;margin:0 0 .25rem;letter-spacing:-.01em}.shell__subtitle{margin:0;color:#6b7280;font-size:.9375rem}