.concrete-hero{align-items:start}.concrete-card{border:1px solid #c8d8f6;border-radius:28px;background:#fff;box-shadow:0 24px 60px #0f172a1f;overflow:hidden}.concrete-card-head{display:flex;justify-content:space-between;gap:20px;padding:22px 24px;color:#fff;background:linear-gradient(135deg,#173b72,#2c69d1)}.concrete-card-head strong{font-size:21px}.concrete-card-head span{font-size:13px;opacity:.82}.concrete-form{padding:24px}.concrete-preferences{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:18px;padding:14px;border-radius:15px;background:#f1f6ff}.concrete-preferences label{display:grid;min-width:190px;gap:6px;color:#334155;font-size:12px;font-weight:800}.concrete-preferences select{min-height:42px;padding:7px 34px 7px 10px;border:1px solid #bdcce1;border-radius:10px;background:#fff;color:#0f172a;font:inherit}.concrete-measurement-guide{display:block;margin:28px 0 30px;padding:26px 28px 18px;border:1px solid #bed2f3;border-radius:28px;background:linear-gradient(145deg,#f8fbff,#edf4ff 62%,#f7f1ff);box-shadow:0 22px 55px #1839701f;overflow:hidden}.concrete-measurement-guide figcaption span{display:block;color:#2563eb;font-size:12px;font-weight:900;letter-spacing:.16em;text-transform:uppercase}.concrete-measurement-guide figcaption strong{display:block;margin-top:7px;color:#173b72;font-size:clamp(22px,2vw,29px);line-height:1.15;letter-spacing:-.025em}.concrete-measurement-guide figcaption small{display:block;margin-top:7px;color:#5f708a;font-size:15px;line-height:1.5}.concrete-slab-diagram{display:block;width:100%;height:auto;min-width:0;min-height:300px;margin-top:8px;overflow:visible}.concrete-dimension-line path{fill:none;stroke:#9bb0ca;stroke-width:1.5;stroke-dasharray:4 5;vector-effect:non-scaling-stroke}.concrete-dimension-line .concrete-dimension-arrow{stroke:#2563eb;stroke-width:2;stroke-dasharray:none}.concrete-dimension-badge rect{fill:#fff;stroke:#b7cdf2;stroke-width:1.5}.concrete-dimension-badge text{fill:#64748b;font:800 9px/1 -apple-system,BlinkMacSystemFont,SF Pro Text,Helvetica Neue,Arial,sans-serif;letter-spacing:.08em;text-anchor:middle}.concrete-dimension-badge text:last-child{fill:#173b72;font-size:14px;letter-spacing:0}.concrete-field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.concrete-field label{display:block;margin-bottom:7px;color:#334155;font-size:13px;font-weight:800}.concrete-input-wrap{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;border:1px solid #cbd5e1;border-radius:13px;background:#fff;overflow:hidden}.concrete-input-wrap:focus-within{border-color:#2563eb;box-shadow:0 0 0 3px #2563eb1f}.concrete-input-wrap input{width:100%;min-width:0;padding:13px 14px;border:0;outline:0;color:#0f172a;background:transparent;font:inherit}.concrete-input-wrap span{padding:0 13px;color:#64748b;font-size:13px;font-weight:800}.concrete-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:22px}.concrete-result{min-height:92px;padding:16px;border:1px solid #d9e3f2;border-radius:16px;background:#f8fbff}.concrete-result span{display:block;color:#64748b;font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.07em}.concrete-result strong{display:block;margin-top:8px;color:#173b72;font-size:24px;line-height:1.1}.concrete-result.primary{border-color:#8ab2ff;background:linear-gradient(135deg,#edf4ff,#f8fbff)}.concrete-actions{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:18px}.concrete-actions button{padding:10px 14px;border:0;color:#2456aa;background:transparent;font:inherit;font-weight:800;cursor:pointer}.concrete-actions small{color:#64748b;line-height:1.5}.formula-table td:first-child{font-weight:800;color:#0f172a}.worked-example{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.worked-example div{padding:20px;border:1px solid #d9e3f2;border-radius:18px;background:#fff}.worked-example strong{display:block;color:#2563eb;font-size:24px}.worked-example span{display:block;margin-top:6px;color:#64748b;font-size:13px}@media (max-width: 860px){.concrete-field-grid,.concrete-results{grid-template-columns:1fr}.worked-example{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width: 560px){.concrete-form,.concrete-card-head{padding:18px}.concrete-card-head span{display:none}.concrete-measurement-guide{padding:20px 14px 12px;border-radius:22px}.concrete-slab-diagram{min-height:210px;margin-top:4px}.concrete-actions{align-items:flex-start;flex-direction:column}.worked-example{grid-template-columns:1fr}}