:root{color-scheme:light;--bg:#f3f2ef;--panel:#fff;--ink:#1d2429;--muted:#5a6a74;--brand:#0b3c5d;--brand-2:#328cc1;--line:#d8dde1}*{box-sizing:border-box}body,html{margin:0;padding:0;background:radial-gradient(circle at 20% 10%,#fff,var(--bg) 60%);color:var(--ink);font-family:Segoe UI,Tahoma,sans-serif}a{color:var(--brand-2)}.shell{max-width:980px;margin:0 auto;padding:2rem 1rem 4rem}.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:0 10px 24px rgba(0,0,0,.05);padding:1rem}.btn{border:0;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;padding:.7rem 1rem;font-weight:600;cursor:pointer}.input{width:100%;border:1px solid var(--line);border-radius:8px;padding:.65rem .75rem;font-size:1rem}.muted{color:var(--muted)}