*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:#f4f6f8;color:#111}a{color:#0d6efd}button{cursor:pointer;border:none;border-radius:8px;padding:12px 16px;font-size:1rem}input,select{width:100%;padding:10px 12px;border:1px solid #ccc;border-radius:8px;font-size:1rem}.card{background:#fff;border-radius:12px;padding:20px;box-shadow:0 2px 8px #0000000f;max-width:420px;margin:0 auto 16px}.btn-primary{background:#0d6efd;color:#fff;width:100%}.btn-danger{background:#dc3545;color:#fff}.btn-success{background:#198754;color:#fff}.balance{font-size:1.75rem;font-weight:700;color:#198754}.balance.negative{color:#dc3545}header{background:#0d6efd;color:#fff;padding:16px;text-align:center}.error{color:#dc3545;font-size:.9rem;margin-top:8px}.notice{border-radius:8px;padding:12px 14px;font-size:.95rem;line-height:1.45;margin-top:12px}.notice-success{background:#d1e7dd;border:1px solid #badbcc;color:#0f5132}.notice-warning{background:#fff3cd;border:1px solid #ffecb5;color:#664d03}.notice-danger{background:#f8d7da;border:1px solid #f5c2c7;color:#842029}