:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color:#111827;background-color:#f8fafc}*{box-sizing:border-box}body{margin:0}.container{width:100%;max-width:1100px;margin:0 auto;padding:1rem}.stack{display:grid;gap:.75rem}.card{background:#fff;border:1px solid #e5e7eb;border-radius:.75rem;padding:1rem}.button-row{display:flex;gap:.5rem;flex-wrap:wrap}.field-label{font-size:.875rem;font-weight:600}.field-error{color:#dc2626;font-size:.8rem}@media(min-width:768px){.container{padding:1.25rem}}