/* PASS 2A — concrete cluster */
.concrete-tool .calculator-box{overflow:visible}.concrete-intro{max-width:820px}.unit-toggle{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 6px}.unit-toggle button,.zone-remove,.zone-add{border:1px solid #aebdb2;background:#fff;color:#173b2b;border-radius:10px;padding:8px 12px;font-weight:800;cursor:pointer}.unit-toggle button[aria-pressed="true"]{background:#173b2b;color:#fff;border-color:#173b2b}.zone-list{display:grid;gap:14px;margin:18px 0}.pour-zone{border:1px solid #d4ddd6;border-radius:18px;padding:17px;background:#fbfcfa}.zone-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:13px}.zone-head h3{margin:0;font-size:1.05rem}.zone-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.zone-fields .field{margin:0}.zone-remove{padding:6px 10px;font-size:.84rem;color:#7b2e22;border-color:#dfbbb2}.zone-add{margin-top:2px}.result-major{grid-column:1/-1;background:rgba(242,184,75,.15);border-color:rgba(242,184,75,.55)}.result-note{grid-column:1/-1;color:#e7efe9;font-size:.83rem;margin:1px 3px 2px}.result-warning{grid-column:1/-1;background:#fff1dc;color:#4b3721;border:1px solid #efd7a7;border-radius:12px;padding:11px 13px}.tool-subsection{margin-top:24px;border-top:1px solid #d8dfda;padding-top:22px}.switch-row{display:flex;align-items:center;gap:10px;margin:10px 0 18px}.switch-row input{width:20px;height:20px}.calc-error{margin:14px 0 0;padding:12px 14px;border-radius:12px;background:#fff0ed;border:1px solid #e6b8ad;color:#7b2e22;font-weight:700}.diagram-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px;margin:22px 0}.calc-diagram{background:#f8f2e6;border:1px solid #dfd3c2;border-radius:16px;padding:15px}.calc-diagram svg{width:100%;height:auto}.calc-diagram strong{display:block;color:#173b2b;margin-top:8px}.layer-diagram{position:relative;border:1px solid #cfd8d1;border-radius:18px;background:#fff;padding:20px;margin:24px 0}.layer{padding:12px 16px;text-align:center;font-weight:850;border:1px solid rgba(23,59,43,.18)}.layer.concrete{background:#d7dbd8}.layer.subbase{background:#ddd0b9}.layer.ground{background:#c9b08a}.layer-labels{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px;font-size:.78rem;color:#58665e;text-align:center}.buying-table{width:100%;border-collapse:collapse;margin:16px 0}.buying-table th,.buying-table td{padding:10px 12px;border-bottom:1px solid #d9e0da;text-align:left}.buying-table th{background:#173b2b;color:white}.source-box{background:#eef3ef;border:1px solid #ccd8cf;border-radius:16px;padding:18px 20px;margin:24px 0}.source-box h3{margin-top:0}.legacy-box{max-width:780px;margin:24px auto 70px;background:#fff;border:1px solid #d5ded7;border-radius:24px;padding:30px;box-shadow:var(--shadow-sm)}.legacy-box .btn{margin-top:8px}.inline-result{font-weight:850;color:#173b2b}.calc-actions .zone-add{background:#fff;color:#173b2b}.calc-actions .zone-add:hover{background:#edf2ed}
@media(max-width:760px){.zone-fields,.diagram-grid{grid-template-columns:1fr}.zone-head{align-items:flex-start}.layer-labels{grid-template-columns:1fr;text-align:left}.buying-table{font-size:.9rem}.buying-table th,.buying-table td{padding:9px 8px}.concrete-tool .calculator-box{padding-inline:16px}.unit-toggle button{flex:1 1 120px}}