:root{--paper:#f8f9f5;--ink:#203e36;--muted:#768078;--line:#e6e9e2;--green:#234d40;--lime:#deedc6;--white:#fff;--shadow:0 8px 35px #203e3606;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button{color:inherit}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #84a96b;outline-offset:3px}input:focus,textarea:focus,select:focus{outline:2px solid #83aa75;outline-offset:2px}button:disabled{opacity:.5;cursor:default}[hidden]{display:none!important}.site-header{max-width:1160px;margin:auto;height:94px;display:flex;align-items:center;justify-content:space-between;padding:0 36px;border-bottom:1px solid var(--line)}.brand{font-size:26px;font-weight:750;letter-spacing:-1.1px;display:flex;align-items:center;gap:9px}.brand-icon{position:relative;font-size:38px;line-height:1;letter-spacing:-4px;transform:rotate(-15deg);margin-right:5px}.brand-icon span{font-size:23px;position:absolute;right:-11px;top:-2px}.brand-dot{color:#90a86f;margin-left:-9px}nav{display:flex;gap:34px;font-size:13px;color:#69756c;align-self:stretch}nav a{display:flex;align-items:center;position:relative}nav a.active{color:var(--ink)}nav a.active:after{content:'';position:absolute;bottom:24px;width:17px;height:2px;background:var(--ink);left:calc(50% - 8px)}.free-badge{font-size:11px;border:1px solid #dde6d4;padding:9px 12px;border-radius:30px;background:#f0f4e8;display:flex;align-items:center;gap:7px}.free-badge>span,.green-dot{width:5px;height:5px;background:#789456;border-radius:50%;display:inline-block}main{max-width:1088px;margin:auto;padding:0 28px}.hero{padding:53px 0 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var(--line);border-radius:7px;font-size:22px;width:34px;height:34px;display:grid;place-items:center}.calc-tabs{display:flex;border-bottom:1px solid var(--line);gap:26px;margin-top:22px;margin-bottom:20px}.calc-tabs button{background:none;border:0;padding:0 1px 12px;font-size:11px;color:#828b80;position:relative}.calc-tabs button[aria-selected=true]{color:#294b3e;font-weight:700}.calc-tabs button[aria-selected=true]:after{position:absolute;content:'';height:2px;background:var(--green);bottom:-1px;left:0;right:0}.display{border:1px solid #dce5cf;border-radius:9px;background:#f2f6e9;padding:13px 17px 11px;min-height:172px}.display-status{display:flex;justify-content:space-between;gap:8px;color:#7b8b6d;font-size:8px;letter-spacing:.7px;font-weight:700}.display-status>span:last-child{font-weight:400;font-size:7px}.previous-expression{font:12px 'Courier New',monospace;text-align:right;color:#8b967f;margin-top:18px;min-height:17px;overflow:auto;white-space:nowrap}.display 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9px}.keypad{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px}.key{height:48px;background:#f3f4f0;border:1px solid #e9ece4;border-bottom:2px solid #e2e6db;border-radius:7px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;transition:background .12s,transform .12s;font-size:16px;font-weight:500}.key:hover{background:#e6ecdf}.key:active{transform:translateY(1px)}.key .secondary{font:8px Arial,sans-serif;color:#89977e;min-height:9px}.key.number{background:#fff;border-color:#e4e8de;font-size:21px}.key.operator{background:#eaf0e1;border-color:#e2e9d9;color:#3f5c34;font-size:23px}.key.enter{background:var(--green);border-color:var(--green);color:white;font-size:13px;grid-column:span 2}.key.enter 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var(--line);padding:15px 0}.guide-accordions details:first-child{padding-top:0}.guide-accordions summary{font-size:12px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;line-height:1.5}.guide-accordions summary:after{content:'+';font-size:18px;color:#8a997c}.guide-accordions details[open] summary:after{content:'−'}.guide-accordions p{font-size:11px;color:#88927f;margin:11px 0 1px}.guide-accordions p a{text-decoration:underline}code{font-size:11px;background:#edf0e5;padding:2px 4px;border-radius:3px}footer{max-width:1088px;margin:auto;border-top:1px solid var(--line);padding:25px 28px;display:flex;gap:20px;align-items:center;flex-wrap:wrap}footer .brand{font-size:21px}footer p{font-size:10px;color:#98a08e;flex:1}footer>div{display:flex;gap:22px;font-size:10px;color:#8f9885}footer button{background:none;border:0;font-size:10px;padding:0;color:inherit}footer>small{width:100%;font-size:8px;color:#a1a995;line-height:1.6}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.tool-intro h3{font-size:21px;font-weight:500;margin:8px 0}.tool-intro p,.form-hint{font-size:11px;color:#84917c}.tool-intro{margin-bottom:24px}.list-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}label{display:flex;flex-direction:column;gap:7px;font-size:11px;color:#6d7f61;margin-bottom:14px}label input,label select,label textarea{width:100%;min-width:0;padding:10px;border:1px solid #dfe6d7;border-radius:6px;background:#fbfcf8;color:var(--ink);font-size:13px}label textarea{resize:vertical;font:13px 'Courier New',monospace}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:0 13px}.primary-button,.secondary-button{border:0;background:var(--green);color:white;border-radius:6px;padding:12px 18px;font-size:12px}.secondary-button{background:#e8efdf;color:var(--green)}.list-formula{margin:23px 0;font-size:12px}.list-formula summary{cursor:pointer;margin-bottom:15px}.result-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:22px}.stat-result{background:#f2f6e9;border:0;border-radius:6px;padding:11px;display:flex;justify-content:space-between;gap:10px;font-size:11px}.stat-result strong{font-family:'Courier New',monospace}table{border-collapse:collapse;width:100%;font-size:12px;margin-top:20px;text-align:right}td,th{padding:12px;border-bottom:1px solid var(--line)}th{background:#eef3e6;color:#6a7f5b;font-weight:500}.inline-error{color:#a05239;font-size:12px;line-height:1.6}.dialog-header{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:22px}dialog{border:1px solid #dfe6d7;border-radius:14px;width:min(550px,calc(100% - 32px));max-height:85vh;padding:26px;color:var(--ink);box-shadow:0 25px 100px #14332830}dialog::backdrop{background:#183e3566;backdrop-filter:blur(4px)}#dialog-body p{font-size:13px;color:#7e8d75}.menu-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px;margin:14px 0 24px}.menu-grid button{border:1px solid #e1e7d9;border-radius:6px;background:#f4f7ee;padding:11px 7px;font-size:12px}.menu-group{font-size:10px;letter-spacing:1px;color:#879b76;text-transform:uppercase;margin-top:18px}.memory-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:11px 0;border-bottom:1px solid var(--line);font-size:13px}.memory-row button{border:0;background:#eff4e6;padding:7px;border-radius:4px;font-size:10px}.memory-row strong{flex:1;overflow-wrap:anywhere;font-family:monospace}.shortcut-list{display:grid;grid-template-columns:1fr 1fr;gap:15px;font-size:12px}.shortcut-list span{display:flex;justify-content:space-between}.focus-view .hero,.focus-view .guide-section,.focus-view footer{display:none}.focus-view .workspace{padding-top:30px}.math-preview{display:flex;justify-content:flex-end;gap:6px;align-items:center;overflow:auto;min-height:34px;color:#60734e;font:20px Georgia,serif;margin:5px 0}.math-frac{display:inline-flex;flex-direction:column;text-align:center;vertical-align:middle;font-size:.8em;line-height:1.3;margin:0 3px}.math-frac>span:first-child{border-bottom:1px solid;padding:0 5px}.math-frac>span:last-child{padding:0 5px}.math-rad{border-top:1px solid;padding:0 4px}
@media(min-width:1200px){.key{height:49px}}@media(max-width:850px){.workspace{grid-template-columns:minmax(0,1fr) 245px;gap:16px}.calculator-card{padding:18px}.keypad{gap:6px}.key{height:46px}.key .secondary{font-size:7px}.guide-section{gap:30px}.site-header{padding:0 28px}}@media(max-width:680px){.site-header{height:74px;padding:0 20px}.brand{font-size:23px}.brand-icon{font-size:32px}nav{gap:20px;font-size:11px}nav a.active:after{bottom:17px}.free-badge{display:none}main{padding:0 16px}.hero{padding:35px 4px 29px}h1{font-size:43px;letter-spacing:-1.8px}.hero>p{font-size:12px}.workspace{grid-template-columns:1fr}.calculator-card{padding:18px;border-radius:12px}.key{height:51px}.key .secondary{font-size:8px}.study-sidebar{display:grid;grid-template-columns:1fr 1fr;gap:12px}.history-card{grid-column:1/-1}.history-list{height:145px}.empty-history{padding:10px}.empty-history>span{display:none}.history-row{padding:10px 0}.tip-card{padding:16px}.tip-card h3{font-size:15px}.tip-card p{font-size:10px}.tip-card a{font-size:8px}.ad-slot{height:auto;min-height:150px;text-align:center;padding:12px}.guide-section{grid-template-columns:1fr;gap:27px;padding:20px 0 35px}.guide-section h2{font-size:29px}.guide-accordions summary{font-size:12px}footer{padding:24px 20px;gap:15px}footer p{font-size:9px}footer>div{width:100%}.display-status>span:last-child{font-size:6px}.menu-grid{grid-template-columns:repeat(2,1fr)}.result-grid{grid-template-columns:1fr 1fr}.stat-result{font-size:10px}.shortcut-list{grid-template-columns:1fr}dialog{padding:20px}.desktop-break{display:none}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

.legal-page{max-width:720px;padding:58px 0 75px}.legal-page h1{font-size:46px}.legal-page h2{margin-top:28px;font-size:21px}.legal-page p{color:#63755c;font-size:15px}.legal-page p a{text-decoration:underline}.ad-live{height:auto;min-height:250px;padding:16px 0;display:block;text-align:center}.ad-live .adsbygoogle{display:block;min-height:220px;margin-top:10px}.hero>p,.guide-accordions p,.guide-section>div>p,.tip-card p,.tool-intro p,.form-hint{color:#68755f}.small-label,.eyebrow,.entry-hint,.keypad-foot,.key .secondary,.history-footer{color:#6b7b5b}.entry-hint{font-size:9px}.history-footer{font-size:9px}.key .secondary{font-size:9px}.display-status{color:#63794e}.history-row span{color:#657b59}.calc-tabs button,.calc-utility button{color:#68765e}.previous-expression{color:#728464}.history-row strong{line-height:1.25}@media(max-width:680px){.key .secondary{font-size:8px}.legal-page{padding:35px 4px}.legal-page h1{font-size:38px}}

.key .secondary{max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding:0 2px}
/* Calculator-first layout */
.site-header{height:68px}nav a.active:after{bottom:14px}.calculator-hero{padding:25px 0 22px}.calculator-hero h1{font-size:36px;line-height:1.15;letter-spacing:-1px;margin:8px 0}.calculator-hero>p{font-size:13px;max-width:780px}.workspace{grid-template-columns:minmax(0,1fr) 300px}.calculator-card{padding:20px}.calculator-heading h2{font-size:18px}.calc-tabs{margin-top:16px;margin-bottom:15px}.key{height:43px}.display{min-height:144px;padding:11px 15px}.previous-expression{margin-top:9px}.display input{font-size:22px}.answer{font-size:28px;min-height:33px}.keypad-foot{margin-top:13px}.editor-navigation{display:flex;justify-content:space-between;align-items:center;margin-top:9px;gap:10px}.editor-navigation>span{font-size:10px;color:#768369}.editor-navigation>div{display:flex;gap:5px}.editor-navigation button{background:#f3f6ec;border:1px solid #e2e9d8;border-radius:5px;width:36px;height:29px;font-size:17px;color:#49643c}.editor-navigation button:hover{background:#e5eed7}.history-list{height:315px}.quick-reference{padding:18px}.reference-row{display:flex;align-items:center;gap:12px;margin:15px 0;font-size:11px;color:#637456}.reference-row kbd{min-width:37px;text-align:center;font-size:11px;line-height:18px}.quick-reference a{margin-top:20px}.calculator-note{font-size:10px;color:#6e7b62;margin:17px 0 0}.guide-section{border-top:1px solid var(--line);padding:27px 0 38px;margin-top:30px;gap:48px}.guide-section h2{font-size:26px}.guide-accordions details{padding:13px 0}.calc-utility{margin:9px 0}.focus-view .calculator-note{display:none}.focus-view .workspace{padding-top:20px}
@media(max-width:850px){.workspace{grid-template-columns:minmax(0,1fr) 245px;gap:16px}.calculator-card{padding:17px}.key{height:43px}.calculator-hero>p{max-width:660px}}
@media(max-width:680px){.site-header{height:62px}.calculator-hero{padding:21px 4px 18px}.calculator-hero h1{font-size:31px}.calculator-hero>p{font-size:12px;line-height:1.6}.workspace{grid-template-columns:1fr}.calculator-card{padding:15px}.key{height:46px}.display{min-height:142px}.editor-navigation button{width:36px;height:30px}.history-list{height:160px}.quick-reference{grid-column:1/-1;padding:16px}.reference-row{display:inline-flex;margin:12px 10px 4px 0;font-size:10px}.reference-row kbd{min-width:33px}.quick-reference a{margin-top:17px}.study-sidebar{grid-template-columns:1fr}.ad-slot{min-height:95px}.calculator-note{font-size:9px}.guide-section{margin-top:24px;grid-template-columns:1fr;gap:24px}.guide-section h2{font-size:25px}.calc-utility button{font-size:9px}.small-label{font-size:8px}}/* Directional controls arranged like a handheld calculator's navigation pad. */
.control-strip{display:grid;grid-template-columns:minmax(0,1fr) 100px;align-items:center;gap:18px;margin:12px 0}
.control-strip .calc-utility{gap:12px;margin:0;justify-content:flex-start;flex-wrap:wrap}
.control-strip .calc-utility button{padding:8px 9px}
.control-strip .editor-navigation{display:block;margin:0;justify-self:end}
.editor-navigation .direction-pad{display:grid;grid-template-columns:repeat(3,30px);grid-template-rows:repeat(3,30px);gap:0;padding:4px;border-radius:50%;background:#eef2e6;border:1px solid #dce5d1;box-shadow:inset 0 1px 3px #244d4010}
.direction-pad button{width:30px;height:30px;margin:0;border:1px solid #d7e1ca;background:#f9fbf4;color:#3e5b33;font-size:19px;line-height:1;border-bottom-width:2px;box-shadow:0 1px 2px #234d4010}
.direction-pad [data-navigation=up]{grid-area:1/2;border-radius:12px 12px 5px 5px}
.direction-pad [data-navigation=left]{grid-area:2/1;border-radius:12px 5px 5px 12px}
.direction-pad [data-navigation=right]{grid-area:2/3;border-radius:5px 12px 12px 5px}
.direction-pad [data-navigation=down]{grid-area:3/2;border-radius:5px 5px 12px 12px}
.direction-center{grid-area:2/2;width:16px;height:16px;align-self:center;justify-self:center;background:#dce5d0;border-radius:50%;box-shadow:inset 0 1px 2px #3e5b3315}
.direction-pad button:hover{background:#dfeacf}.direction-pad button:active{transform:translateY(1px)}
@media(max-width:680px){.control-strip{gap:12px;grid-template-columns:minmax(0,1fr) 100px;margin:10px 0}.control-strip .calc-utility{display:grid;grid-template-columns:1fr 1fr;gap:7px}.control-strip .calc-utility button{padding:8px 5px;text-align:left;font-size:10px}.control-strip .calc-utility button:last-child{justify-self:start;padding:6px 10px;text-align:center}.direction-pad button{width:30px;height:30px}}/* Fill the space alongside the pad with two rows of scientific keys. */
.compact-utility{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:9px 0 7px}
.compact-utility button{padding:5px 7px;min-height:28px}
.control-strip{gap:12px;margin:0 0 8px;grid-template-columns:minmax(0,1fr) 100px}
.upper-keypad{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;align-content:center}
.upper-keypad .key{height:45px}
@media(max-width:680px){.compact-utility{margin:8px 0 6px;gap:4px}.compact-utility button{font-size:9px;padding:5px 4px}.control-strip{gap:10px;margin:0 0 8px}.upper-keypad .key{height:45px}.upper-keypad{gap:8px}}/* Five-column functional layout, with the handheld's scientific and numeric rows. */
.workspace{grid-template-columns:minmax(0,480px) minmax(240px,300px);justify-content:center;gap:24px}.calculator-hero,.guide-section,.calculator-note{max-width:804px;margin-left:auto;margin-right:auto}.control-strip{grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:8px}.upper-keypad{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.keypad:not(.upper-keypad){grid-template-columns:repeat(5,minmax(0,1fr))}.key.enter{grid-column:auto}.control-strip .editor-navigation{justify-self:center}.compact-utility{justify-content:flex-end;gap:16px;margin:6px 0}.upper-keypad .key{height:44px}.key{height:44px}.key.number{font-size:21px}.key.operator{background:#dfe9d2}.key .secondary{font-size:9px}.display{font-family:'Courier New',monospace}.calculator-menu-tabs{display:flex;gap:12px;border-bottom:1px solid var(--line);margin-bottom:12px}.calculator-menu-tabs button{border:0;background:none;padding:9px 12px;font:13px 'Courier New',monospace}.calculator-menu-tabs button.selected{background:#eef3e4;border-bottom:2px solid var(--green)}.calculator-menu-items{display:grid;gap:5px}.calculator-menu-items button{border:1px solid transparent;background:none;text-align:left;border-radius:5px;padding:11px 12px;font:14px 'Courier New',monospace}.calculator-menu-items button.selected,.calculator-menu-items button:focus{background:#edf3e3;border-color:#d6e4c9}.powered-off .display input,.powered-off .previous-expression,.powered-off .answer,.powered-off #math-preview{visibility:hidden}.powered-off .key:not([aria-label=on]){opacity:.6}
@media(max-width:850px){.workspace{grid-template-columns:minmax(0,480px) 245px;gap:16px}.key .secondary{font-size:8px}}
@media(max-width:680px){.workspace{grid-template-columns:minmax(0,480px);justify-content:center}.control-strip{grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:8px}.key{height:46px}.upper-keypad .key{height:45px}.compact-utility{gap:16px}.key .secondary{font-size:8px}.key.enter{font-size:11px}}
/* Finishing details: aligned numeric block and clearly labelled MultiView display. */
.display{padding:12px 14px;min-height:180px}.display-status{font-size:10px;letter-spacing:0}.display-status>span:last-child{display:none}.previous-expression{display:none}.display-history{border-bottom:1px solid #dce5cf;margin:10px 0 8px;padding-bottom:6px}.display-history-row{display:flex;justify-content:space-between;gap:14px;width:100%;border:0;background:none;padding:4px 0;text-align:left;font:12px 'Courier New',monospace;color:#63765c}.display-history-row span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.display-history-row strong{white-space:nowrap;font-weight:500}.entry-label,.result-caption{display:block;font:10px Arial,sans-serif;color:#66765d;margin-top:9px;letter-spacing:.3px}.display input{font-size:20px;margin-top:0}.display input::placeholder{font:14px Arial,sans-serif;color:#86917f}.result-caption{border-top:1px solid #e0e8d7;padding-top:7px;margin-top:5px}.answer{font-size:27px;min-height:31px}.entry-hint{font-size:10px;line-height:1.5;letter-spacing:0}.key{height:48px;border-radius:7px}.key .secondary{font-size:11px;line-height:14px;color:#53654a;letter-spacing:0}.key.number,.key[data-action=negate],.key[data-action="."]{background:#fff;font-size:21px}.key.operator{background:#dfe9d2;font-size:22px}.key.enter{background:var(--green);color:white;font-size:15px}.key-help{min-height:30px;margin-top:9px;font-size:11px;line-height:1.4;color:#687764}.upper-keypad .key{height:48px}.editor-navigation .direction-pad{grid-template-columns:repeat(3,28px);grid-template-rows:repeat(3,28px);padding:3px}.direction-pad button{width:28px;height:28px;font-size:18px}.control-strip{margin:9px 0}.powered-off .display-history,.powered-off .entry-label,.powered-off .result-caption{visibility:hidden}
@media(max-width:680px){.keypad,.upper-keypad{gap:6px}.key,.upper-keypad .key{height:48px}.key .secondary{font-size:10px}.calculator-card{padding:13px}.calc-tabs{margin-top:15px;margin-bottom:13px}.display-history-row{font-size:11px}.key-help{font-size:10px}.calculator-hero{padding-top:17px;padding-bottom:15px}.control-strip{gap:6px}.direction-pad button{min-width:28px;min-height:28px}}

/* Compact scientific screen: history, active math entry, and answer share one surface. */
.display{position:relative;min-height:150px;padding:10px 13px 8px;border-radius:7px;color:#344a2e}.display-status{font:10px 'Courier New',monospace;min-height:15px;align-items:center;border-bottom:1px solid #dce5cf;padding-bottom:5px}.display-status>span:first-child{font-weight:bold}.entry-label,.result-caption{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);margin:0;padding:0;border:0}.display-history{margin:5px 0 3px;padding:0;border:0;max-height:100px;overflow:auto;scrollbar-width:thin}.display-history-row{font:14px 'Courier New',monospace;padding:3px 0;align-items:center;color:#66795b;gap:12px}.display-history-row>span{min-width:0;overflow:auto;text-overflow:clip;scrollbar-width:none}.display-history-row strong{font-size:15px}.display input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none;padding:0;margin:0}.display .math-preview{display:block;margin:3px 0 0;padding:6px 0;min-height:34px;max-width:100%;overflow-x:auto;overflow-y:hidden;white-space:nowrap;text-align:left;font:20px 'Courier New',monospace;cursor:text;scrollbar-width:thin;border-top:1px dotted #d0dcc2}.math-line,.math-group{display:inline-flex;align-items:center;vertical-align:middle;white-space:nowrap}.math-token{display:inline-block;position:relative;min-width:.05em}.math-fraction{display:inline-flex;flex-direction:column;align-items:stretch;text-align:center;vertical-align:middle;margin:0 .17em;font-size:.88em;line-height:1.15}.math-fraction>span:first-child{border-bottom:1px solid currentColor;padding:0 .16em .08em}.math-fraction>span:last-child{padding:.08em .16em 0}.math-power{display:inline-flex;align-self:flex-start;font-size:.7em;transform:translateY(-.35em);margin-left:.05em}.math-root{display:inline-flex;align-items:center}.math-radicand{border-top:1px solid currentColor;padding:0 .08em}.math-root-index{font-size:.55em;align-self:flex-start;margin-right:-.2em}.math-caret:before{content:'';position:absolute;left:-1px;top:0;bottom:0;border-left:2px solid #345c2a;animation:math-blink 1.1s steps(1) infinite}.math-selected{background:#d0dfbd;outline:1px solid #879f70}.history-selection{background:#e5edda}.answer{font:22px 'Courier New',monospace;min-height:28px;margin:0;padding:1px 0;text-align:right;letter-spacing:0}.answer:not(.error):before{content:'= ';font-size:15px;color:#75866a}.answer.error{padding:6px 0}.entry-hint{border:0;margin-top:3px;padding-top:3px;font-size:9px;line-height:1.3;color:#738568}.powered-off .math-preview{visibility:hidden}@keyframes math-blink{50%{opacity:0}}@media(prefers-reduced-motion:reduce){.math-caret:before{animation:none}}@media(max-width:680px){.display{padding:9px 11px 7px}.display .math-preview{font-size:19px}.display-history-row{font-size:12px}.display-history-row strong{font-size:14px}.answer{font-size:21px}}

/* Quiet empty entry, paired history rows, and an optional dedicated key guide. */
.display{min-height:120px}.display .math-preview{padding-left:3px}.math-caret{min-height:1em}.history-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;text-align:left;padding:12px 0}.history-row>span{text-align:left;overflow-wrap:anywhere;min-width:0;font-size:12px}.history-row>strong{text-align:right;white-space:nowrap;font-size:17px;margin:0}.key-guide{margin-top:8px;border:1px solid var(--line);border-radius:6px;background:#f8faf4;padding:7px 10px;font-size:11px;color:#63745b}.key-guide summary{cursor:pointer;list-style-position:inside}.key-guide .key-help{margin-top:7px;min-height:0;line-height:1.5}.key-guide[open]{padding-bottom:9px}
/* DATA / STAT / TABLE use the existing LCD surface and keypad. */
.lcd-app #display-history,.lcd-app #answer,.lcd-app #previous-expression{display:none!important}.lcd-app{min-height:180px}.lcd-menu #math-preview{display:none!important}.lcd-title{font-weight:bold;font-size:12px;padding:5px 0}.lcd-list,.lcd-table{display:grid;gap:2px;font:14px 'Courier New',monospace;min-width:0}.lcd-list{grid-template-columns:repeat(3,minmax(0,1fr))}.lcd-table{grid-template-columns:repeat(2,minmax(0,1fr))}.lcd-list button,.lcd-table button,.lcd-tabs button,.lcd-menu-item{border:0;border-radius:2px;background:transparent;color:inherit;font:inherit;min-width:0;cursor:pointer}.lcd-cell{min-height:27px;padding:3px 4px;overflow-x:auto;text-align:right;white-space:nowrap;scrollbar-width:thin}.lcd-cell.selected,.lcd-menu-item.selected,.lcd-tabs .selected{background:#d0dfbd;outline:1px solid #879f70}.lcd-list>button:nth-child(-n+3){font-weight:bold;border-bottom:1px solid #bdcbb1}.lcd-table>strong{text-align:right;font-weight:normal;border-bottom:1px solid #bdcbb1}.lcd-author{font:12px 'Courier New',monospace;padding-top:5px;overflow-wrap:anywhere}.lcd-menu-item{display:block;width:100%;text-align:left;padding:5px 3px;min-height:29px;font:13px 'Courier New',monospace;overflow-wrap:anywhere}.lcd-tabs{display:flex;gap:9px;font:12px 'Courier New',monospace;margin-bottom:4px}.lcd-tabs button{padding:3px}.lcd-error{color:#8c4030;font:12px 'Courier New',monospace;padding:5px 0;overflow-wrap:anywhere}.powered-off #lcd-workspace{visibility:hidden}@media(max-width:680px){.lcd-list,.lcd-table{font-size:12px}.lcd-cell{min-height:28px}.lcd-menu-item{font-size:12px}}
.calculator-body{margin-top:15px}

/* Original handheld housing; presentation only, shared by every LCD workflow. */
.workspace{grid-template-columns:minmax(0,380px) minmax(240px,300px);gap:24px}
.calculator-card{background:#d7dbdc;border:1px solid #a9b1b4;border-radius:22px 22px 30px 30px;padding:17px 16px 13px;box-shadow:inset 0 1px 0 #f3f5f5,0 3px 0 #aeb6b8;color:#263136}
.calculator-heading{min-height:38px;align-items:center;gap:10px;padding:0 3px 9px;border-bottom:1px solid #bbc2c4}
.calculator-heading .small-label{font:700 9px Arial,sans-serif;letter-spacing:1.3px;color:#47575d}
.calculator-heading h2{font:700 15px Arial,sans-serif;letter-spacing:-.2px;margin:4px 0 0;color:#263136}
.calculator-heading .icon-button{border-color:#aeb8bd;background:#e6e9e9;color:#34434a;width:30px;height:30px;border-radius:5px}
.calculator-body{margin-top:11px}
.calculator-card .display{background:#dce2cb;color:#253021;border:5px solid #626e72;border-radius:5px;padding:7px 9px;min-height:112px;box-shadow:inset 0 1px 3px #33403925}
.calculator-card .display-status{color:#33412b;font-size:10px;min-height:16px;padding-bottom:3px;border-color:#b5bea4}
.calculator-card .display-history{margin:3px 0 1px;max-height:82px}
.calculator-card .display-history-row{color:#46513c;font-size:13px;padding:2px 0}
.calculator-card .display-history-row strong{font-size:14px}
.calculator-card .display .math-preview{font-size:19px;min-height:29px;padding:4px 0 4px 3px;margin-top:2px;border-color:#b5bea4}
.calculator-card .answer{font-size:21px;min-height:25px;padding:0}
.calculator-card .answer:not(.error):before{color:#56634a}
.calculator-card .lcd-app{min-height:180px}
.calculator-card .lcd-cell,.calculator-card .lcd-menu-item{color:#253021}
.calculator-card .entry-hint{font:10px/1.4 Arial,sans-serif;color:#47575d;min-height:14px;margin:7px 2px 0;padding:0}
.calculator-card .compact-utility{margin:5px 0;gap:10px}
.calculator-card .compact-utility button{background:transparent;color:#37494f;font-size:10px;padding:3px 5px;min-height:24px;border-radius:4px}
.calculator-card .control-strip{grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:5px;margin:5px 0 6px;align-items:center}
.calculator-card .keypad,.calculator-card .upper-keypad{gap:6px}
.calculator-card .key{height:44px;border-radius:6px;background:#374147;border:1px solid #232c31;color:#f7f9fa;font:17px Arial,sans-serif;box-shadow:inset 0 1px 0 #647078,0 1px 0 #8f999d;padding:3px 1px}
.calculator-card .key .secondary{color:#edf0a9;font:10px/13px Arial,sans-serif;letter-spacing:0;white-space:nowrap}
.calculator-card .key.number,.calculator-card .key[data-action=negate],.calculator-card .key[data-action="."]{background:#f1f2ed;color:#202b30;border-color:#a6adb0;font-size:21px;box-shadow:inset 0 1px 0 #fff,0 1px 0 #959ea2}
.calculator-card .key.number .secondary,.calculator-card .key[data-action=negate] .secondary,.calculator-card .key[data-action="."] .secondary{color:#3c575c}
.calculator-card .key.operator,.calculator-card .key.enter{background:#4c656d;border-color:#354b53;color:#fff;box-shadow:inset 0 1px 0 #748c94,0 1px 0 #929da2}
.calculator-card .key.operator{font-size:22px}.calculator-card .key.enter{font-size:14px}
.calculator-card .key.second{background:#b5c76b;color:#263019;border-color:#87964f;box-shadow:inset 0 1px 0 #d5e3a1,0 1px 0 #959ea2}
.calculator-card .key:hover{filter:brightness(1.09)}.calculator-card .key:active{transform:translateY(1px);box-shadow:inset 0 1px 2px #16242a40}
.calculator-card .key.active-secondary{outline:2px solid #b3c767;outline-offset:0}
.calculator-card .key .secondary{white-space:normal;line-height:11px;overflow-wrap:normal;text-wrap:balance;flex-shrink:0}
.calculator-card .key[data-action=scientific]{gap:0;padding:1px}
.skip-link{position:fixed;top:8px;left:8px;z-index:1000;padding:12px 16px;background:#fff;color:#203e36;border:2px solid #234d40;transform:translateY(-180%)}.skip-link:focus{transform:none}
.independent-brand{font-size:20px;letter-spacing:-.5px;gap:5px;flex-wrap:wrap}.independent-brand>span{font-size:12px;letter-spacing:0}
.independent-notice{font-size:12px;line-height:1.6;color:#41564a;margin-top:18px}.independent-notice a{text-decoration:underline}
.compatibility-source{font:13px/1.6 'Courier New',monospace;white-space:pre-wrap;overflow-wrap:anywhere;color:#324c40}
.ad-region{height:286px;min-height:286px;padding:8px 0;border:1px solid #d6dcd5;text-align:center;color:#5d6b60;background:#f7f8f4;overflow:visible}
.ad-region>span{display:block;font:10px/14px Arial,sans-serif;letter-spacing:1px}.ad-content{width:250px;height:250px;margin:4px auto 0}.ad-below{max-width:804px;margin:24px auto}
[data-privacy-settings]{border:1px solid #bcc7bb;border-radius:4px;background:transparent;padding:8px 10px;font-size:12px}
@media(min-width:681px) and (max-width:1000px){[data-ad-region=sidebar]{display:none}}
@media(max-width:680px){.study-sidebar .ad-region{grid-column:1/-1}.ad-below{margin-top:18px}}
footer>div{flex-wrap:wrap;row-gap:10px}.legal-page a{text-decoration:underline}
@media(max-width:680px){.site-header .independent-brand{font-size:17px;max-width:145px}.independent-brand>span{font-size:11px}.independent-notice{font-size:12px}}
.calculator-card .direction-pad{background:#b9c1c4;border:1px solid #929ea3;box-shadow:inset 0 1px 1px #f1f4f4;grid-template-columns:repeat(3,32px);grid-template-rows:repeat(3,32px);padding:2px}
.calculator-card .direction-pad button{width:32px;height:32px;min-width:32px;min-height:32px;background:#46565e;color:#fff;border-color:#33444b;font:20px Arial,sans-serif;box-shadow:inset 0 1px 0 #75858c}
.calculator-card .direction-pad button:hover{background:#5b707b}.calculator-card .direction-center{background:#89989f;box-shadow:none}
.calculator-card .key-guide{border-color:#b0b9bd;background:#e2e6e6;color:#3d5057;margin-top:8px;font-size:10px;padding:6px 8px}
.calculator-card .key-help,.calculator-card .keypad-foot,.calculator-card .keypad-foot button{color:#3d5057;font-size:10px}
.calculator-card .keypad-foot{margin-top:8px;padding:0 2px}
@media(max-width:850px){.workspace{grid-template-columns:minmax(0,380px) minmax(220px,245px);gap:16px}}
@media(max-width:680px){.workspace{grid-template-columns:minmax(0,380px);justify-content:center}.calculator-card{padding:14px 11px 12px}.calculator-card .keypad,.calculator-card .upper-keypad{gap:5px}.calculator-card .key{height:46px}.calculator-card .key .secondary{font-size:10px}.calculator-card .direction-pad{grid-template-columns:repeat(3,34px);grid-template-rows:repeat(3,34px)}.calculator-card .direction-pad button{width:34px;height:34px;min-width:34px;min-height:34px}.calculator-card .display{padding:7px 8px}.calculator-card .display .math-preview{font-size:18px}.calculator-card .key.enter{font-size:13px}}