.calculator{max-width:420px;margin:0 auto;padding:2rem;background:#fff;border-radius:1rem;box-shadow:0 .5rem 1rem rgba(0,0,0,.1);font-family:sans-serif}.calculator h2{font-size:1.5rem;color:#1c1c1e;text-align:center;margin-bottom:.8rem}.tab-container{display:flex;gap:.5rem;margin-bottom:.8rem}.btn-active{flex:1;padding:.75rem !important;border:none !important;border-radius:.75rem !important;font-size:1rem !important;font-weight:600 !important;cursor:pointer;background:#007aff !important;color:#fff !important;transition:background .2s;margin:0 !important}.btn-inactive{flex:1;padding:.75rem !important;border:none !important;border-radius:.75rem !important;font-size:1rem !important;font-weight:600 !important;cursor:pointer;background:#e5e5ea !important;color:#3a3a3c !important;transition:background .2s;margin:0 !important}.calculator label{display:block;font-weight:600;color:#3a3a3c;margin:.5rem 0 .2rem !important;font-size:.95rem}.calculator input[type=number]{width:100% !important;box-sizing:border-box !important;padding:.55rem 1rem !important;border:1px solid #ccc !important;border-radius:.75rem !important;font-size:1.1rem !important;font-weight:600 !important;text-align:center !important;background:#f9f9f9 !important;height:auto !important;margin:0 0 .4rem !important;box-shadow:none !important}.calc-btn{margin-top:.8rem !important;width:100% !important;padding:.85rem !important;background:#007aff !important;color:#fff !important;border:none !important;border-radius:.75rem !important;font-size:1.1rem !important;font-weight:600 !important;cursor:pointer}#result-gas,#result-ev{margin-top:.8rem;text-align:left}