.intro{margin-bottom:18px}.intro h1{font-size:clamp(1.75rem,3vw,2.45rem);line-height:1.2;margin:8px 0 10px}.eyebrow,.section-kicker{color:#17604f;font-size:.78rem;font-weight:700;letter-spacing:.12em;margin:0;text-transform:uppercase}.lead{line-height:1.8;margin:0;max-width:800px}.tool-shell{border:1px solid #aeb6b1;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);margin-top:20px}.calculator-panel,.visual-panel{min-width:0;padding:26px}.calculator-panel{border-right:1px solid #cbd0cd}.section-heading h2,.visual-heading-row h2{font-size:1.45rem;line-height:1.35;margin:8px 0 22px}.mode-fieldset{border:1px solid #cbd0cd;margin:0;padding:14px}.mode-fieldset legend{font-weight:700;padding:0 6px}.mode-options{display:flex;flex-wrap:wrap;gap:10px}.mode-option{align-items:center;border:1px solid #b7c0bb;cursor:pointer;display:flex;gap:8px;min-height:42px;padding:8px 12px}.mode-option:has(input:checked){background:#eaf3ef;border-color:#17604f}.mode-option input{accent-color:#17604f}.input-grid{display:grid;gap:16px;grid-template-columns:1fr 1fr;margin-top:18px}.field{display:grid;gap:7px;font-weight:700;min-width:0}.field-wide{grid-column:1/-1}.field textarea,.field input,.field select{background:#fff;border:1px solid #89958f;border-radius:0;box-sizing:border-box;color:#17211d;font:inherit;min-height:44px;padding:10px;width:100%}.field textarea{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;line-height:1.6;resize:vertical}.field input:focus,.field textarea:focus,.field select:focus{border-color:#17604f;box-shadow:0 0 0 3px rgba(23,96,79,.18);outline:0}.field small{color:#66716c;font-size:.8rem;font-weight:400;line-height:1.55}.unit-input{display:grid;grid-template-columns:minmax(0,1fr) 92px}.unit-input select{border-left:0}.solid-fields{display:grid;gap:16px;grid-template-columns:1fr 1fr}.form-error{background:#fff2ef;border-left:4px solid #a53a2d;color:#7d281e;font-weight:700;line-height:1.6;margin:16px 0 0;padding:12px}.form-actions{align-items:center;border-top:1px solid #d4d8d5;display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;padding-top:20px}.button{border:1px solid #17604f;border-radius:0;cursor:pointer;font-weight:700;min-height:46px;padding:10px 18px}.button-primary{background:#17604f;color:#fff}.button-secondary{background:#fff;color:#17604f}.button:focus-visible,.mode-option:has(input:focus-visible){outline:3px solid #17604f;outline-offset:3px}.result-box{border:1px solid #17604f;margin-top:16px;padding:18px}.result-box[data-state=waiting]{border-color:#9ba5a0}.result-box[data-state=error]{border-color:#a53a2d}.result-box[data-state=tntc]{border-color:#9c5d18}.result-box[data-state=zero]{border-color:#17604f}.result-label{color:#66716c;font-size:.8rem;margin:0}.result-value{display:block;font-size:clamp(1.8rem,4vw,2.7rem);font-weight:700;line-height:1.2;margin:14px 0;overflow-wrap:anywhere}.result-status{color:#4d5a54;line-height:1.6;margin:0}.result-details{display:grid;grid-template-columns:1fr 1fr;margin:20px 0 0}.result-details div{border:1px solid #cbd0cd;margin:-1px 0 0 -1px;padding:12px}.result-details .detail-wide{grid-column:1/-1}.result-details dt{color:#66716c;font-size:.78rem;margin-bottom:5px}.result-details dd{line-height:1.6;margin:0;overflow-wrap:anywhere}.visual-heading-row{align-items:flex-start;display:flex;gap:16px;justify-content:space-between}.status-badge{border:1px solid #17604f;color:#17604f;font-size:.78rem;padding:7px 10px;white-space:nowrap}.visual-metrics{display:grid;grid-template-columns:1fr 1fr;margin:0}.visual-metrics div{border:1px solid #cbd0cd;margin:-1px 0 0 -1px;padding:14px}.visual-metrics dt{color:#66716c;font-size:.78rem}.visual-metrics dd{font-size:1.05rem;font-weight:700;margin:7px 0 0}.plate-figure{background:#f0f4f1;border:1px solid #ccd3cf;margin:18px 0 0;padding:18px}.plate-list{display:grid;gap:10px;grid-template-columns:repeat(3,minmax(0,1fr))}.plate-card{background:#fff;border:1px solid #c3ccc7;min-width:0;padding:12px}.plate-card[data-range=ok]{border-top:4px solid #17604f}.plate-card[data-range=low]{border-top:4px solid #9c5d18}.plate-card[data-range=high]{border-top:4px solid #a53a2d}.plate-card[data-range=tntc]{border-top:4px solid #6c3c85}.plate-number{color:#66716c;font-size:.75rem}.plate-count{font-size:1.15rem;font-weight:700;margin-top:7px;overflow-wrap:anywhere}.plate-placeholder{color:#66716c;grid-column:1/-1;text-align:center}.plate-figure figcaption,.visual-description{color:#5d6963;font-size:.83rem;line-height:1.7}.plate-figure figcaption{margin-top:18px}.visual-description{margin:16px 0 0}.content-section{margin-top:46px}.formula-list{display:grid;grid-template-columns:1fr 1fr}.formula-list article{border:1px solid #cbd0cd;display:grid;gap:7px;margin:-1px 0 0 -1px;padding:18px}.formula-list strong{font-size:.95rem;overflow-wrap:anywhere}.formula-list span{color:#66716c;font-size:.84rem}.proof-guide{border:1px solid #cbd0cd;margin-top:20px;padding:20px}.proof-guide h3{margin:0 0 12px}.proof-guide li{line-height:1.8}.proof-guide ul{margin:0;padding-left:22px}.site-footer .footer-inner{align-items:center;display:flex;flex-wrap:wrap;gap:14px}.site-footer a{color:inherit}
@media(max-width:1040px){.tool-shell{grid-template-columns:1fr}.calculator-panel{border-bottom:1px solid #cbd0cd;border-right:0}.formula-list{grid-template-columns:1fr}}
@media(max-width:620px){.calculator-panel,.visual-panel{padding:20px 14px}.input-grid,.solid-fields{grid-template-columns:1fr}.field-wide{grid-column:auto}.result-details,.visual-metrics{grid-template-columns:1fr}.result-details .detail-wide{grid-column:auto}.form-actions{display:grid;grid-template-columns:1fr 1fr}.button{padding-inline:10px}.plate-list{grid-template-columns:1fr 1fr}.visual-heading-row{align-items:flex-start}.content-section{margin-top:34px}.site-footer .footer-inner{align-items:flex-start;flex-direction:column}}
@media(max-width:390px){.plate-list{grid-template-columns:1fr}.mode-options{display:grid;grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition-duration:.01ms!important}}