.fch-root{--fch-blue:#0b3563;--fch-ink:#172a43;--fch-soft:#f5f8fe;--fch-border:#d9e2ef;font:inherit;color:var(--fch-ink);max-width:1500px;margin:24px auto;line-height:1.5}.fch-root *{box-sizing:border-box}.fch-workspace{display:grid;grid-template-columns:minmax(0,1.06fr) minmax(430px,.94fr);align-items:start;gap:26px}.fch-left,.fch-science{min-width:0;background:#fff;border:1px solid var(--fch-border);border-radius:22px;box-shadow:0 14px 45px #0f2d4d0d}.fch-left{padding:24px}.fch-hub-top{margin-bottom:22px}.fch-hub-top h2{font-size:clamp(1.45rem,2.5vw,2rem);color:var(--fch-blue);margin:0}.fch-hub-top p{margin:3px 0 16px;color:#65758b}.fch-search{display:block;width:100%;max-width:390px;font:inherit;padding:11px 14px;border:1px solid #b7c7dc;border-radius:11px;background:#fff;color:var(--fch-ink)}.fch-left-layout{display:grid;grid-template-columns:185px minmax(0,1fr);gap:20px}.fch-side-nav{border-right:1px solid var(--fch-border);padding-right:14px;max-height:700px;overflow:auto}.fch-side-group{margin-bottom:16px}.fch-side-group h3{font-size:.76rem;text-transform:uppercase;letter-spacing:.07em;color:#677a92;margin:0 0 8px}.fch-nav-item{display:block;width:100%;text-align:left;border:0;background:transparent;color:#263e5b;border-radius:8px;padding:8px 10px;font:inherit;font-size:.88rem;cursor:pointer}.fch-nav-item:hover,.fch-nav-item.active{background:#e7f0ff;color:#064ca7;font-weight:700}.fch-panel{min-width:0}.fch-card{min-width:0}.fch-card h3{font-size:1.3rem;margin:0 0 7px;color:#07376c}.fch-help{margin:0 0 18px;color:#617084;font-size:.89rem}.fch-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.fch-field{margin:0 0 13px;min-width:0}.fch-field label{display:block;font-size:.88rem;font-weight:650;margin:0 0 6px;color:#243b56}.fch-field input,.fch-field select,.fch-field textarea{display:block;width:100%;min-height:43px;font:inherit;color:#152d4a;background:#fff;border:1px solid #adc1d8;border-radius:8px;padding:9px 10px}.fch-field textarea{min-height:92px;resize:vertical}.fch-field input::placeholder,.fch-field textarea::placeholder{color:#8290a0}.fch-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:7px}.fch-button{padding:10px 18px;border:1px solid #347c32;border-radius:8px;background:#388637;color:#fff;font:inherit;font-weight:700;cursor:pointer}.fch-button.fch-secondary{border-color:#bbc6d3;background:#f1f3f6;color:#31445d}.fch-button:disabled{opacity:.6;cursor:wait}.fch-result{margin-top:17px;border-left:4px solid #388637;background:#f1f9f0;border-radius:9px;padding:15px 18px;overflow-wrap:anywhere}.fch-result[hidden],.fch-history[hidden]{display:none}.fch-result p{margin:5px 0 0;font-size:.87rem}.fch-value{font-size:1.7rem;line-height:1.2;color:#173e1d}.fch-result .fch-error{color:#a11d20;font-weight:700}.fch-science{padding:22px;position:sticky;top:20px}.fch-science-head h3{margin:0 0 14px;color:#14263e;font-size:1.15rem}.fch-display{border:1px solid #d2d7dc;border-radius:20px;min-height:112px;position:relative;padding:15px 19px 13px 56px;display:flex;flex-direction:column;justify-content:flex-end}.fch-history-toggle{position:absolute;left:14px;top:17px;border:0;background:transparent;color:#697078;font-size:1.75rem;line-height:1;cursor:pointer}.fch-expression{width:100%;border:0!important;outline:0;background:transparent!important;font:inherit!important;font-size:1.08rem!important;min-height:30px!important;text-align:right;color:#485363!important;padding:0!important}.fch-science-value{display:block;text-align:right;font-size:2.15rem;line-height:1.3;color:#0a192d;min-height:42px;overflow-wrap:anywhere}.fch-science-error{color:#a11d20;font-size:.95rem}.fch-science-controls{display:flex;gap:8px;margin:14px 0 5px}.fch-angle{border:0;border-radius:20px;padding:5px 16px;background:#e5edfc;color:#073d8b;font:inherit;cursor:pointer}.fch-angle[aria-pressed=true]{background:#c8dafc}.fch-keypad{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:5px}.fch-key{min-width:0;min-height:54px;border:0;border-radius:99px;background:#e4ecff;color:#0c243d;font:inherit;font-weight:600;font-size:1.05rem;cursor:pointer}.fch-key-number{background:#f0f2f4;color:#39424b}.fch-key-equals{background:#3472ee;color:#fff}.fch-key:hover,.fch-angle:hover{filter:brightness(.95)}.fch-key:active{transform:scale(.96)}.fch-history{margin-top:12px;max-height:170px;overflow:auto;border-top:1px solid var(--fch-border);color:#506078;font-size:.85rem}.fch-history p{margin:8px 0}.fch-root :is(button,input,select,textarea,h3):focus-visible{outline:3px solid #ffaf3a;outline-offset:2px}@media(max-width:1100px){.fch-workspace{grid-template-columns:1fr}.fch-science{position:static;max-width:700px;width:100%;margin:auto}}@media(max-width:650px){.fch-root{margin:12px auto}.fch-left,.fch-science{padding:16px;border-radius:16px}.fch-left-layout{grid-template-columns:1fr}.fch-side-nav{border-right:0;border-bottom:1px solid var(--fch-border);max-height:160px;padding:0 0 10px;display:flex;gap:16px}.fch-side-group{min-width:145px}.fch-fields{grid-template-columns:1fr}.fch-keypad{gap:3px}.fch-key{min-height:44px;font-size:.85rem}.fch-display{min-height:100px}.fch-science-value{font-size:1.7rem}}@media(max-width:360px){.fch-key{font-size:.72rem;min-height:40px}.fch-science{padding:11px}}

@supports (container-type:inline-size){.fch-root{container-type:inline-size}@container (max-width:1080px){.fch-workspace{grid-template-columns:1fr}.fch-science{position:static;max-width:700px;width:100%;margin:auto}}@container (max-width:650px){.fch-left-layout{grid-template-columns:1fr}.fch-side-nav{border-right:0;border-bottom:1px solid var(--fch-border);max-height:160px;padding:0 0 10px;display:flex;gap:16px}.fch-side-group{min-width:145px}.fch-fields{grid-template-columns:1fr}}}
/* Version 1.2: visible category, calculator, and calculation-mode tabs. */
.fch-category-tabs{display:flex;gap:7px;overflow-x:auto;scrollbar-width:thin;padding:1px 1px 10px;margin:0 0 10px;border-bottom:1px solid var(--fch-border)}.fch-category-tab{flex:0 0 auto;border:1px solid #d3ddea;border-radius:10px 10px 4px 4px;background:#f4f7fb;color:#304963;padding:10px 14px;font:inherit;font-size:.85rem;font-weight:600;cursor:pointer}.fch-category-tab.active{background:#165fba;border-color:#165fba;color:#fff}.fch-tool-tabs{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0 23px}.fch-tool-tab{border:1px solid #c6d6e9;border-radius:99px;background:#fff;color:#24466d;padding:7px 12px;font:inherit;font-size:.86rem;cursor:pointer}.fch-tool-tab.active{background:#e8f2ff;border-color:#3976c9;color:#06468d;font-weight:700}.fch-mode-tabs{display:grid;grid-template-columns:repeat(auto-fit,minmax(135px,1fr));gap:8px;margin:17px 0 20px}.fch-mode-tab{border:1px solid #bfd0e5;border-radius:10px;background:#f3f7fc;color:#254363;padding:10px 12px;min-height:46px;font:inherit;font-size:.88rem;font-weight:600;text-align:center;cursor:pointer}.fch-mode-tab[aria-selected=true]{background:#1a65be;border-color:#1a65be;color:#fff;box-shadow:0 4px 12px #1a65be30}.fch-mode-tab:hover:not([aria-selected=true]),.fch-tool-tab:hover:not(.active),.fch-category-tab:hover:not(.active){background:#e6effb}.fch-root .fch-mode-tab:focus-visible,.fch-root .fch-category-tab:focus-visible,.fch-root .fch-tool-tab:focus-visible{outline:3px solid #ffaf3a;outline-offset:2px}@media(max-width:650px){.fch-mode-tabs{grid-template-columns:repeat(2,minmax(0,1fr))}.fch-category-tab{padding:9px 11px}.fch-tool-tabs{max-height:130px;overflow:auto}}