.heater-layout{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.heater-result{position:static}
.heater-result h2{font-size:clamp(1.65rem,3vw,2.25rem);margin:6px 0 10px;color:var(--primary)}
.heater-result .heater-summary{margin:0 0 18px;color:var(--muted);line-height:1.65}
.heater-chart{margin:0;padding:10px 8px 4px;border:1px solid var(--line);border-radius:16px;background:var(--surface);overflow:hidden}
.heater-chart svg{display:block;width:100%;height:auto;overflow:visible}
.heater-result .heater-chart-note{font-size:.8rem;line-height:1.6;color:var(--muted);margin:10px 0 20px}
.heater-shop{margin-top:20px}
.heater-shopee{display:flex;align-items:center;justify-content:center;gap:10px;min-height:54px;padding:12px 16px;border:1px solid #ee4d2d;border-radius:12px;background:#ee4d2d;color:#fff;font-size:1.2rem;font-weight:750;line-height:1.5;text-align:center;text-decoration:none;transition:background .15s}
.heater-shopee:hover{background:#d93d20;border-color:#d93d20;color:#fff;text-decoration:none}
.heater-shopee:focus-visible,.heater-cost-link:focus-visible{outline:3px solid var(--primary);outline-offset:4px}
.heater-shopee svg{flex:none}
.heater-shop small{display:block;text-align:center;color:var(--muted);font-size:.76rem;margin-top:8px;line-height:1.6}
.heater-cost-link{display:block;text-align:center;font-weight:650;font-size:.93rem;margin-top:16px;padding:6px}
.heater-method{border-top:1px solid var(--line);margin-top:18px;padding-top:14px;font-size:.86rem}
.heater-method summary{cursor:pointer;font-weight:650;color:var(--muted)}
.heater-method p{font-size:.85rem}
.heater-result [hidden]{display:none}
@media(max-width:760px){.heater-layout{grid-template-columns:1fr}.heater-form .form-grid{grid-template-columns:1fr 1fr}.heater-form .field:first-child{grid-column:1/-1}.heater-form small{font-size:.76rem}.heater-chart{padding:8px 3px 0}.heater-shopee{font-size:1.2rem;padding:12px 8px}}
@media(max-width:360px){.heater-form .form-grid{grid-template-columns:1fr}.heater-form,.heater-result{padding:16px}.heater-shopee{gap:7px}}