:root{--ink:#17211b;--muted:#5a6b60;--line:#d7e0d9;--accent:#1f6f43;--error:#a3301f;--bg:#fff;color:var(--ink);background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;font-size:17px;line-height:1.5}.shell{max-width:34rem;margin:0 auto;padding:1.5rem 1.25rem 3rem}h1{margin:0 0 .25rem;font-size:1.6rem}h2{margin:0 0 .5rem;font-size:1.05rem}.muted{color:var(--muted);margin:0 0 1.25rem}.panel{border:1px solid var(--line);border-radius:10px;margin:1.5rem 0;padding:1rem}label{margin-bottom:.35rem;font-weight:600;display:block}input{border:1px solid var(--line);border-radius:8px;width:100%;padding:.85rem .75rem;font-size:1rem}input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}button{color:#fff;background:var(--accent);border:1px solid var(--accent);cursor:pointer;border-radius:8px;width:100%;margin-top:1rem;padding:.9rem 1rem;font-size:1rem;font-weight:600}button:disabled{opacity:.5;cursor:default}button.secondary{color:var(--muted);border-color:var(--line);background:0 0}.error{color:var(--error);margin:.75rem 0 0}