:root{--text: #1c2024;--muted: #5b6570;--accent: #2f6fed;--surface: #ffffff;--bg: #f6f7f9;font-family:-apple-system,Segoe UI,Roboto,sans-serif}body{margin:0;background:var(--bg);color:var(--text);line-height:1.5}main{max-width:42rem;margin:0 auto;padding:1.5rem 1rem 4rem}button{font:inherit;min-height:3rem;padding:0 1.5rem;border:none;border-radius:.75rem;background:var(--accent);color:#fff;cursor:pointer}button[disabled]{opacity:.6;cursor:default}input[type=text]{font:inherit;width:100%;min-height:3rem;padding:0 .75rem;border:1px solid #c8cdd4;border-radius:.75rem;box-sizing:border-box}section{background:var(--surface);border-radius:1rem;padding:1rem;margin:1rem 0}.muted{color:var(--muted)}.error{color:#b3261e}