:root{--bg:#f3f4f6;--surface:#ffffff;--border:#e5e7eb;--text:#1e293b;--text-muted:#6b7280;--accent:#6366f1;--accent-hover:#4f46e5;--red:#dc2626;--red-bg:#fee2e2}*{box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,segoe ui,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);margin:0;min-height:100vh;display:flex;flex-direction:column}.center-wrap{flex:1;display:flex;align-items:center;justify-content:center}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:2.5rem 3rem;text-align:center;box-shadow:0 1px 3px rgba(0,0,0,6%);max-width:24rem}h1{margin:0 0 .5rem;font-size:1.3rem;letter-spacing:-.02em}p{color:var(--text-muted);margin:0 0 1.5rem;font-size:.9rem}.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:.7rem 1.5rem;border-radius:8px;font-weight:600;font-size:.9rem;transition:background .15s}.btn:hover{background:var(--accent-hover)}.error{margin-top:1.25rem;padding:.6rem .8rem;border-radius:8px;background:var(--red-bg);color:var(--red);font-size:.82rem;text-align:left}.about-link{display:block;margin-top:1rem;font-size:.8rem;color:var(--text-muted);text-decoration:none}.about-link:hover{color:var(--accent);text-decoration:underline}.app-footer-disclaimer{max-width:42rem;margin:1.25rem auto 0;padding:0 1rem;font-size:.7rem;line-height:1.4;color:var(--text-muted);opacity:.8;text-align:center}