/* Jiansuan · Framed sheet · seed 709801064 · local type + sage brand retained */
:root {
  color-scheme: light;
  --page:#f4f6f5;--surface:#f7f8f7;--canvas:#ffffff;--key:#f0f2f1;--key-number:#ffffff;
  --key-hover:#e4e9e6;--ink:#20322a;--ink-2:#46594f;--ink-3:#5d6c63;
  --accent:#285e49;--accent-hover:#194d38;--accent-soft:#e8efeb;--on-accent:#ffffff;
  --line:#e5eae7;--line-strong:#cbd5ce;--line-faint:#eef1ef;--error:#a13730;--error-soft:#fff0ee;
  --backdrop:rgba(16,30,23,.38);--modal-shadow:0 20px 64px rgba(16,30,23,.18);
  --font-ui:'Segoe UI','Microsoft YaHei','PingFang SC',system-ui,sans-serif;
  --font-math:'KaTeX_Main','Times New Roman',serif;
  --r:16px;--r-sm:6px;--white-space:transparent;
}
*{box-sizing:border-box}html{min-height:100%;scroll-behavior:smooth}body{margin:0;min-height:100dvh;background:var(--page);color:var(--ink);font-family:var(--font-ui);font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}
button,input,select{font:inherit;min-width:0}button,a{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button{border:0;color:inherit;cursor:pointer;white-space:nowrap;transition:background .12s ease,color .12s ease,transform .12s ease}button:disabled{cursor:default;color:var(--ink-3);opacity:.55}button:active:not(:disabled){transform:translateY(1px)}button,a,input,select{outline-offset:3px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--accent)}a{color:inherit}svg{width:18px;height:18px;display:block;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}img{max-width:100%;height:auto}[data-icon]{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}h1,h2,h3,p{margin:0}h1,h2,h3{min-width:0;overflow-wrap:anywhere}code,kbd{font:inherit;white-space:nowrap}kbd{font-variant-numeric:tabular-nums}
.skip-link{position:fixed;top:8px;left:8px;z-index:100;background:var(--accent);color:var(--on-accent);padding:12px 18px;border-radius:var(--r-sm);transform:translateY(-160%)}.skip-link:focus{transform:none}
/* 1280px frame = 992px work sheet + 24px gutter + 264px reference rail. */
.site-header,.workspace,.site-footer{width:calc(100% - 64px);max-width:1280px;margin-inline:auto}
.site-header{height:72px;display:flex;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}.brand img{width:32px;height:32px}.brand-name{font-size:21px;font-weight:650;letter-spacing:-.4px}.site-header nav{display:flex;align-items:center;gap:20px;margin-inline-start:auto}.text-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:0;background:transparent;color:var(--ink-2);font-size:13px}.text-button:hover{color:var(--accent)}.text-button svg{width:16px;height:16px}.support-button{display:flex;align-items:center;justify-content:center;gap:8px;min-height:40px;padding:0 14px;border:1px solid var(--line-strong);border-radius:var(--r-sm);background:transparent;font-size:13px}.support-button:hover{background:var(--key-hover)}.support-button svg{width:16px;height:16px}.language-picker{display:inline-flex;align-items:center;gap:6px;min-height:44px;color:var(--ink-2)}.language-picker svg{width:16px;height:16px}.language-picker select{border:0;background:transparent;color:var(--ink);font-size:13px;min-height:44px;max-width:126px;cursor:pointer}.language-picker option{color:var(--ink);background:var(--canvas)}
.workspace{padding-top:18px}.workspace-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.workspace-heading h1{font-size:24px;line-height:1.3;font-weight:600;letter-spacing:-.6px}.privacy-note{display:flex;align-items:center;gap:7px;color:var(--ink-3);font-size:12px}.privacy-note svg{width:15px;height:15px}.workspace-grid{display:grid;grid-template-columns:minmax(0,1fr) 264px;gap:24px;align-items:start}
.calculator{min-width:0;overflow:clip;background:var(--canvas);border:1px solid var(--line);border-radius:var(--r)}.calculator-topbar{min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 20px;border-bottom:1px solid var(--line-faint)}.calculator-title{display:flex;align-items:center;gap:9px}.calculator-title svg{width:17px;height:17px;color:var(--ink-3)}.calculator-title h2{font-size:14px;font-weight:600}.topbar-actions{display:flex;align-items:center;gap:4px}.saved-label{font-size:12px;color:var(--ink-3);margin-inline-end:8px}.icon-button{width:36px;min-width:36px;min-height:36px;display:inline-flex;align-items:center;justify-content:center;background:transparent;border-radius:var(--r-sm);color:var(--ink-2)}.icon-button:hover:not(:disabled){background:var(--key-hover)}.icon-button svg{width:16px;height:16px}
.expression-notebook{display:flex;flex-direction:column;padding-top:8px}.notebook-caption{min-height:44px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 20px;color:var(--ink-3);font-size:12px}.notebook-caption>span{min-width:0}.expression-list{max-height:340px;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent}.expression-row{position:relative;display:grid;grid-template-columns:28px minmax(0,1fr) 36px;align-items:start;min-height:112px;padding:8px 16px;border-bottom:1px solid var(--line-faint);border-inline-start:2px solid transparent}.expression-row.is-active{background:var(--surface);border-inline-start-color:var(--accent)}.expression-row:focus-within{background:var(--surface)}.row-number{font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums;padding-top:17px}.expression-content{min-width:0}.expression-input{direction:ltr;text-align:left}math-field.expression-input{display:block;width:100%;min-height:56px;padding:0;border:0;border-radius:0;background:transparent;color:var(--ink);font-family:var(--font-math);font-size:25px;line-height:1.5;--caret-color:var(--accent);--selection-background-color:var(--accent-soft);--selection-color:var(--ink);--contains-highlight-background-color:var(--accent-soft);--placeholder-color:var(--ink-3);--smart-fence-color:var(--ink-3);--horizontal-padding:0px;--vertical-padding:5px}math-field.expression-input::part(container){padding:6px 0;min-height:56px;border:0;outline:0}math-field.expression-input::part(content){padding:0}math-field.expression-input::part(virtual-keyboard-toggle),math-field.expression-input::part(menu-toggle){display:none}math-field.expression-input:focus,math-field.expression-input:focus-visible{outline:0}math-field.expression-input[aria-invalid=true]{color:var(--error)}math-field.expression-input[disabled]{opacity:.6;cursor:not-allowed}.math-loading{min-height:112px;padding:24px;color:var(--ink-3);font-size:13px;display:flex;align-items:center}.result-line{display:flex;align-items:center;gap:8px;min-height:32px;direction:ltr}.result-equals{font-size:18px;color:var(--ink-3)}.result-value{font-family:var(--font-ui);font-size:26px;line-height:1.3;font-weight:500;font-variant-numeric:tabular-nums;color:var(--accent);overflow-wrap:anywhere}.result-copy{width:32px;min-width:32px;min-height:32px;opacity:0}.result-copy svg{width:14px;height:14px}.row-remove{opacity:0;margin-top:7px}.row-remove svg{width:14px;height:14px}.expression-row:hover .result-copy,.expression-row:focus-within .result-copy,.result-copy:focus-visible,.expression-row:hover .row-remove,.expression-row:focus-within .row-remove,.row-remove:focus-visible{opacity:1}.row-error{color:var(--error);font-size:13px;line-height:1.7;overflow-wrap:anywhere}.empty-hint{font-size:12px;color:var(--ink-3);padding:2px 0 6px}.add-expression{display:flex;align-items:center;gap:8px;min-height:44px;margin:4px 16px 8px;padding:0 8px;text-align:start;font-size:13px;background:transparent;color:var(--ink-2);border-radius:var(--r-sm)}.add-expression:hover{background:var(--surface)}.add-expression svg{width:16px;height:16px}.shortcut-hint{margin-inline-start:auto;font-size:12px;color:var(--ink-3)}
.keypad-area{padding:8px 16px 0;background:var(--surface);border-top:1px solid var(--line)}.keypad-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:48px;margin-bottom:8px}.tabs{display:flex;align-items:center;gap:24px;min-width:0;overflow-x:auto;scrollbar-width:none}.tabs button{position:relative;min-height:44px;padding:0 2px;border-bottom:2px solid transparent;background:transparent;color:var(--ink-3);font-size:13px}.tabs button[aria-selected=true]{border-color:var(--ink);color:var(--ink);font-weight:600}.tabs button:hover{color:var(--ink)}.keypad-options{display:flex;align-items:center;gap:4px;flex-shrink:0}.angle-toggle{display:inline-flex;align-items:center;direction:ltr;background:var(--key);padding:3px;border-radius:var(--r-sm);flex-shrink:0}.angle-toggle button{min-height:30px;min-width:42px;padding:0 7px;border-radius:4px;background:transparent;color:var(--ink-3);font-size:11px}.angle-toggle button[aria-pressed=true]{color:var(--ink);background:var(--canvas);font-weight:600}.keypad{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:6px;direction:ltr}.key{display:flex;align-items:center;justify-content:center;gap:6px;min-height:52px;padding:6px 4px;background:var(--key);border:1px solid var(--line);border-radius:var(--r-sm);font-family:var(--font-math);font-size:21px;font-variant-numeric:tabular-nums;color:var(--ink)}.key.number{font-family:var(--font-ui);background:var(--key-number);font-size:22px;font-weight:500}.key.function{font-size:18px}.key.operator{background:var(--key-hover);font-family:var(--font-ui);font-size:23px}.key.small-label{font-family:var(--font-ui);font-size:14px}.key.clear{font-family:var(--font-ui);font-size:14px}.key:hover{background:var(--key-hover);border-color:var(--line-strong)}.key.enter{background:var(--ink);border-color:var(--ink);color:var(--on-accent);font-family:var(--font-ui);font-size:13px}.key.enter:hover{background:var(--accent-hover)}.key sup{font-size:.65em;align-self:baseline;margin-top:2px;margin-left:-4px}.key svg{width:20px;height:20px}.key.span-two{grid-column:span 2}.keypad.functions-layout,.keypad.variables-layout{grid-template-columns:repeat(6,minmax(0,1fr))}.variables-status{grid-column:1/-1;color:var(--ink-3);font-size:13px;line-height:1.8;white-space:normal;padding:4px 0 8px}.variable-chip{display:inline-block;padding:3px 8px;margin:0 6px 4px 0;border-radius:4px;background:var(--key-hover);color:var(--ink);font-variant-numeric:tabular-nums}.fraction-key{display:inline-flex;flex-direction:column;align-items:stretch;justify-content:center;min-width:16px;font-family:var(--font-math);font-size:16px;line-height:1.05;text-align:center}.fraction-key>span:first-child{border-bottom:1px solid currentColor;padding:0 4px 2px}.fraction-key>span:last-child{padding:2px 4px 0}.keypad-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:48px;font-size:12px;color:var(--ink-3)}.keypad-footer>span{display:flex;align-items:center;gap:6px}.status-dot{width:5px;height:5px;display:inline-block;border-radius:50%;background:currentColor;flex-shrink:0}.math-cursor-controls{display:flex;align-items:center;gap:4px;direction:ltr}.math-cursor-controls .icon-button{font-size:18px;min-height:40px}.keypad-footer .text-button{font-size:12px}
.side-notes{min-width:0;padding:4px 0 0}.examples-disclosure>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px;list-style:none;font-size:14px;font-weight:600;cursor:pointer}.examples-disclosure>summary::-webkit-details-marker{display:none}.examples-disclosure>summary svg{width:16px;height:16px;transition:transform .12s ease}.examples-disclosure[open]>summary svg{transform:rotate(180deg)}.aside-title{display:flex;justify-content:space-between;gap:8px;color:var(--ink-3);font-size:12px;margin:4px 0 12px}.example{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;min-height:82px;padding:12px 0;background:transparent;text-align:start;border-bottom:1px solid var(--line);border-radius:0}.example>span:first-child{min-width:0}.example-name{display:block;font-size:12px;color:var(--ink-3);margin-bottom:8px}.example-formula{display:block;direction:ltr;font-family:var(--font-math);font-size:16px;white-space:nowrap}.example svg{width:16px;height:16px;color:var(--ink-2)}.example:hover .example-formula{color:var(--accent)}.little-tip{display:flex;gap:10px;padding-top:24px;margin-top:4px}.little-tip>span{padding-top:3px;color:var(--ink-3)}.little-tip svg{width:16px;height:16px}.little-tip h3{font-size:14px;font-weight:600;margin-bottom:8px}.little-tip p{font-size:13px;line-height:1.8;color:var(--ink-2)}.below-calculator{display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:calc(100% - 288px);min-height:48px;color:var(--ink-3);font-size:12px}.below-calculator>span{display:flex;align-items:center;gap:7px}.below-calculator svg{width:14px;height:14px}.below-calculator .text-button{font-size:12px}.site-footer{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0 24px;color:var(--ink-3);font-size:12px}.site-footer>div{display:flex;align-items:center;gap:20px}.site-footer .text-button{font-size:12px}.footer-dot{color:var(--line-strong)}
dialog{width:min(550px,calc(100vw - 32px));max-height:calc(100dvh - 40px);overflow:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--canvas);color:var(--ink);padding:24px;box-shadow:var(--modal-shadow);font-size:14px;line-height:1.7}dialog::backdrop{background:var(--backdrop)}.dialog-header{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}.dialog-header h2{font-size:22px;font-weight:600;line-height:1.3}.dialog-header .icon-button{flex-shrink:0}.dialog-lead{color:var(--ink-2);font-size:14px;margin:8px 0 20px}.help-list{padding-top:4px}.help-list>div{display:grid;grid-template-columns:140px minmax(0,1fr);align-items:center;gap:16px;min-height:48px;padding:10px 0;border-bottom:1px solid var(--line-faint);font-size:13px}.help-list code,.help-list kbd{font-size:12px;color:var(--ink);white-space:normal;overflow-wrap:anywhere}.help-callout{margin-top:20px;padding:14px 16px;border-radius:var(--r-sm);background:var(--surface);color:var(--ink-2);font-size:13px;line-height:1.8}.fine-print{font-size:12px;color:var(--ink-3);line-height:1.8;margin-top:16px}#about-dialog p:not(.dialog-lead):not(.fine-print){margin:16px 0;color:var(--ink-2)}#donation-dialog{max-width:440px;text-align:center}#donation-dialog .dialog-header{justify-content:flex-end;margin-bottom:4px}#donation-title{font-size:23px;font-weight:600;line-height:1.35}#donation-dialog .dialog-lead{margin-bottom:20px}.payment-tabs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px;background:var(--surface);padding:4px;border:1px solid var(--line);border-radius:var(--r-sm);margin:16px 0}.payment-tab{min-height:44px;background:transparent;border-radius:4px;color:var(--ink-2);font-size:14px;padding:8px}.payment-tab[aria-selected=true]{background:var(--canvas);color:var(--ink);font-weight:600}.payment-tab:hover{background:var(--key-hover)}.payment-panel{text-align:center}.payment-qr-frame{display:flex;align-items:center;justify-content:center;width:244px;max-width:100%;min-height:240px;margin:auto;padding:12px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--canvas)}.payment-qr{display:block;width:218px;max-width:100%;height:auto;image-rendering:pixelated;user-select:auto}.payment-qr-error{font-size:13px;color:var(--ink-3)}.payment-panel [hidden]{display:none}.payment-instructions{font-size:13px;line-height:1.8;color:var(--ink-2);margin:12px auto 16px;max-width:310px}.payment-actions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.payment-save,.payment-open{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 14px;border-radius:var(--r-sm);text-decoration:none;font-size:13px;flex:1 1 120px}.payment-save{background:var(--surface);color:var(--ink);border:1px solid var(--line)}.payment-open,.primary-button,.donation-link{background:var(--ink);color:var(--on-accent)}.payment-open:hover,.primary-button:hover,.donation-link:hover{background:var(--accent-hover)}.payment-save:hover{background:var(--key-hover)}.share-button{display:inline-flex;align-items:center;gap:8px;min-height:44px;margin-top:16px;background:transparent;color:var(--ink-2);font-size:13px}.share-button svg{width:16px;height:16px}.dialog-actions{display:flex;justify-content:flex-end;gap:12px;margin-top:24px}.primary-button,.secondary-button,.donation-link{min-height:44px;padding:10px 16px;border-radius:var(--r-sm);font-size:13px;text-decoration:none}.secondary-button{background:var(--surface);color:var(--ink)}.donation-link{display:flex;justify-content:center;margin-top:16px}.donation-qr{display:block;max-width:218px;height:auto;margin:16px auto}.donation-status{font-size:14px;padding:16px;background:var(--surface);border-radius:var(--r-sm)}.donation-status small{display:block;font-size:12px;color:var(--ink-3);margin-top:6px}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,8px);opacity:0;pointer-events:none;background:var(--ink);color:var(--on-accent);font-size:13px;line-height:1.6;padding:12px 18px;border-radius:8px;max-width:calc(100vw - 32px);z-index:200;transition:opacity .12s ease,transform .12s ease;text-align:center}.toast.is-visible{opacity:1;transform:translate(-50%,0)}.noscript-note{margin:20px;padding:20px;background:var(--error-soft);color:var(--error)}
math-field.expression-input::part(placeholder){color:var(--ink-3);opacity:1;font-size:.8em}
.expression-list,.keypad,.angle-toggle,.example-formula,.help-list code,.help-list kbd{direction:ltr}.help-list code,.help-list kbd{unicode-bidi:isolate}[dir=rtl] .variables-status{direction:rtl;text-align:right}
@media(hover:none){.result-copy,.row-remove{opacity:1}}
@media(max-width:1100px){.workspace-grid{grid-template-columns:minmax(0,1fr) 232px}.below-calculator{max-width:calc(100% - 256px)}.keypad{gap:5px}.key{font-size:20px}.tabs{gap:16px}.example-formula{font-size:15px}}
@media(max-width:980px){.workspace-grid{display:flex;flex-direction:column;gap:16px}.calculator,.side-notes{width:100%}.side-notes{padding:0}.examples-disclosure{border-top:1px solid var(--line);padding-top:8px}.examples-content{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.aside-title{grid-column:1/-1;margin-bottom:0}.example{min-height:86px;align-self:start}.little-tip{grid-column:1/-1;padding-top:4px;margin:0}.below-calculator{max-width:none}.site-footer{padding-top:12px}.expression-list{max-height:300px}}
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