.calc-box { margin:18px 0 6px; padding:16px 18px; border:1px solid #dde3e8; border-radius:0; background:#fff; }
.calc-title { margin:0 0 10px; font-weight:800; }
.calc-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:12px; margin-bottom:12px; }
.calc-box label { font-size:.84rem; font-weight:700; }
.calc-box label span { display:block; margin-bottom:5px; }
.calc-box input { width:100%; padding:9px 11px; border:1px solid #b9c4cf; border-radius:6px; font:inherit; font-weight:700; font-variant-numeric:tabular-nums; }
.calc-box input:focus-visible { outline:3px solid #113e64; outline-offset:2px; }
.calc-result { margin:0 0 8px; padding:10px 12px; border-left:4px solid #2e7d5b; background:#f5f8fb; font-weight:800; font-size:1.05rem; }
.calc-result.calc-error { border-left-color:#a12820; color:#a12820; }
.calc-note { margin:0; color:#5c6c7d; font-size:.76rem; line-height:1.7; }
@media (max-width:640px) { .calc-grid { grid-template-columns:1fr; } }