.arsa-calc{background:#fff;border:1px solid #dcd7c9;border-radius:12px;padding:20px;margin:0 0 20px;box-sizing:border-box}
.arsa-calc h3{margin:0 0 4px;font-size:1.25rem}
.arsa-calc .arsa-desc{color:#5b6b61;margin:0 0 14px;font-size:.93rem}
.arsa-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin-bottom:12px}
.arsa-calc label{display:block;font-size:.85rem;font-weight:600;margin-bottom:4px}
.arsa-calc input{width:100%;padding:10px;border:1px solid #dcd7c9;border-radius:8px;font-size:1rem;background:#fcfbf8;box-sizing:border-box}
.arsa-btn{background:#1f5f3b;color:#fff;padding:11px 20px;border-radius:8px;font-weight:700;border:0;cursor:pointer;font-size:1rem}
.arsa-btn:hover{background:#2e7d4f}
.arsa-result{margin-top:14px;background:#eaf3ed;border-radius:8px;padding:12px 14px;display:none}
.arsa-result b{color:#1f5f3b}
.arsa-result div{margin:2px 0}