.rp-tool{--rp-ink:#102e3b;--rp-muted:#506571;--rp-border:#c5d5dc;--rp-blue:#075f78;--rp-soft:#f0f6f8;color:var(--rp-ink);margin-block:2rem;max-width:100%;line-height:1.55}
.rp-tool *{box-sizing:border-box}
.rp-tool [hidden]{display:none!important}
.rp-tool h2,.rp-tool h3{color:var(--rp-ink);line-height:1.25}
.rp-tool h2{font-size:clamp(1.5rem,3vw,2rem);margin-block:0 1rem}
.rp-tool h3{font-size:1.1rem;margin-block:0 .6rem}
.rp-tool p{margin-block:.65rem}
.rp-tool a{color:#075d78;text-decoration:underline;text-underline-offset:.2em;overflow-wrap:anywhere}
.rp-tool-intro{font-size:1.08rem;max-width:70ch}
.rp-method{padding:1.25rem;border:1px solid var(--rp-border);border-left:4px solid var(--rp-blue);border-radius:.35rem;background:var(--rp-soft);margin-block:1.25rem 1.5rem}
.rp-method p{font-size:.94rem}
.rp-source-list{padding-left:1.25rem;margin-block:.75rem}
.rp-source-list li{margin-block:.25rem}
.rp-version{color:var(--rp-muted);font-size:.8rem!important}
.rp-input-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.25rem}
.rp-calculator{margin-block:1.5rem}
.rp-field{display:flex;flex-direction:column;gap:.4rem;min-width:0}
.rp-field label,.rp-export>label{font-weight:650;font-size:.95rem}
.rp-field input,.rp-field select,.rp-field textarea,.rp-export-text{display:block;width:100%;min-height:46px;border:1px solid #8babb9;border-radius:.3rem;padding:.65rem .75rem;background:#fff;color:var(--rp-ink);font:inherit;line-height:1.4}
.rp-field textarea{min-height:6rem;resize:vertical}
.rp-field input[aria-invalid=true]{border:2px solid #a62323}
.rp-field-hint{font-size:.85rem;line-height:1.45;color:var(--rp-muted)}
.rp-tool :is(input,select,textarea,button,a,summary,[tabindex]):focus-visible{outline:3px solid #9b5b00;outline-offset:3px}
.rp-tool-actions{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem;margin-block:1.5rem 1rem}
.rp-tool .rp-button{display:inline-flex;justify-content:center;align-items:center;gap:.4rem;min-height:46px;padding:.65rem 1.05rem;border:1px solid var(--rp-blue);border-radius:.3rem;background:var(--rp-blue);color:#fff;font:inherit;font-weight:650;line-height:1.35;text-decoration:none;cursor:pointer}
.rp-tool .rp-button:hover{background:#05475c;color:#fff}
.rp-tool .rp-button-secondary{background:#fff;color:var(--rp-blue)}
.rp-tool .rp-button-secondary:hover{background:#e7f1f5;color:#043f53}
.rp-tool .rp-button:disabled{opacity:.5;cursor:not-allowed}
.rp-results{display:block;padding:1.15rem 1.3rem;border:1px solid #aac7b9;border-radius:.35rem;background:#f0f8f3;color:#163d2a;font-size:1.06rem;overflow-wrap:anywhere;white-space:pre-line}
.rp-result-line{display:block;margin-block:.3rem}
.rp-error{padding:1rem;border:1px solid #b44242;border-radius:.3rem;background:#fff1f0;color:#801919;font-weight:600}
.rp-prefill{padding:1rem 1.2rem;margin:0 0 1.5rem;border:1px solid var(--rp-border);border-radius:.3rem}
.rp-prefill legend,.rp-layer legend{padding-inline:.4rem;font-weight:650}
.rp-prefill .rp-field{max-width:36rem}
.rp-diagram{margin:1rem auto 1.5rem;max-width:36rem}
.rp-diagram svg{display:block;width:100%;height:auto;border:1px solid var(--rp-border);border-radius:.3rem;background:#fff}
.rp-diagram figcaption{color:var(--rp-muted);font-size:.8rem;margin-top:.4rem;text-align:center}
.rp-substrate{fill:#d5e7ef;stroke:#7eabba;stroke-width:1}
.rp-copper{fill:#a96322;stroke:#754110;stroke-width:1}
.rp-svg-text{fill:#183b49;font-family:system-ui,sans-serif;font-size:14px}
.rp-material-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}
.rp-material-card{padding:1.25rem;border:1px solid var(--rp-border);border-radius:.4rem;background:#fff;min-width:0}
.rp-material-choice{display:flex;align-items:center;gap:.6rem;font-weight:700;font-size:1.03rem;cursor:pointer;min-height:44px}
.rp-material-choice input{width:1.15rem;height:1.15rem;flex-shrink:0;accent-color:var(--rp-blue)}
.rp-material-metric{display:flex;flex-direction:column;gap:.25rem;margin-block:.85rem;overflow-wrap:anywhere}
.rp-material-metric span{font-size:.85rem;color:var(--rp-muted)}
.rp-material-links{font-size:.9rem}
.rp-compare{margin-block:1.5rem 2rem;padding:1.25rem;background:var(--rp-soft);border:1px solid var(--rp-border);border-radius:.4rem}
.rp-table-scroll{overflow-x:auto;max-width:100%}
.rp-compare-table{width:100%;border-collapse:collapse;background:#fff;font-size:.9rem}
.rp-compare-table caption{text-align:left;padding-block:.5rem;color:var(--rp-muted)}
.rp-compare-table th,.rp-compare-table td{text-align:left;vertical-align:top;border:1px solid var(--rp-border);padding:.8rem;min-width:12rem}
.rp-compare-table th:first-child{min-width:8rem}
.rp-compare-table th{background:#e5eef2}
.rp-exclusions{margin-top:1.5rem;border-top:1px solid var(--rp-border);padding-top:1rem}
.rp-exclusions summary{font-weight:650;cursor:pointer;min-height:44px;padding:.5rem 0}
.rp-exclusions li{margin-block:.6rem}
.rp-empty{padding:1rem;background:var(--rp-soft);border:1px solid var(--rp-border)}
.rp-layer{border:1px solid var(--rp-border);border-radius:.35rem;padding:1rem;margin-block:0 1.1rem}
.rp-layer-grid{display:grid;grid-template-columns:1fr 1.5fr 1fr;gap:1rem;margin-bottom:1rem}
.rp-stack-sketch{margin-block:1.25rem;display:grid;gap:3px}
.rp-stack-band{font-size:.88rem;padding:.55rem .9rem;overflow-wrap:anywhere;border:1px solid #8cabb8}
.rp-stack-copper{color:#fff;background:#86501b;border-color:#754110}
.rp-stack-dielectric{color:#163b4b;background:#d5e7ef}
.rp-export{margin-block:1.5rem;padding:1.1rem;background:var(--rp-soft);border:1px solid var(--rp-border);border-radius:.4rem}
.rp-export-text{margin-top:.6rem;white-space:pre-wrap;font-size:.9rem;resize:vertical;min-height:12rem}
.rp-copy-status{font-size:.9rem;color:var(--rp-muted)}
@media(max-width:640px){.rp-input-grid,.rp-material-grid,.rp-layer-grid{grid-template-columns:1fr}.rp-method,.rp-compare,.rp-material-card{padding:1rem}.rp-tool-actions{align-items:stretch}.rp-tool-actions>.rp-button{flex:1 1 10rem}.rp-prefill{padding:1rem}.rp-diagram{margin-inline:0}}
@media(prefers-reduced-motion:reduce){.rp-tool *{scroll-behavior:auto}}