@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;600;700&display=swap');
*{box-sizing:border-box}body{margin:0;background:#f4f3ee;color:#283b3b;font-family:'DM Sans','Noto Sans TC',sans-serif}button,input{font:inherit}button{cursor:pointer}header{margin:0 5%;height:100px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #daddd5}header a{color:inherit;text-decoration:none;font-size:25px;font-weight:700;letter-spacing:3px}header a span{font-size:12px;letter-spacing:1px;margin-left:24px;font-weight:400}.tag,.eyebrow{font-size:10px;letter-spacing:2px;color:#667a72}main{max-width:1300px;margin:58px auto 65px;padding:0 40px;display:grid;grid-template-columns:1fr 390px 250px;gap:55px;align-items:start}.intro{padding-top:50px}h1{font-size:40px;letter-spacing:-1px;line-height:1.45;margin:24px 0}p{font-size:14px;line-height:2;color:#78827a}.tips{font-size:12px;margin:35px 0}.dot{display:inline-block;width:7px;height:7px;background:#418974;border-radius:50%;margin-right:7px}details{font-size:12px;max-width:270px;margin-bottom:65px}summary{cursor:pointer}small{font-size:10px;line-height:1.9;color:#8a918a}.calculator{background:linear-gradient(130deg,#34414c,#222c36);border:1px solid #56616a;border-radius:25px 25px 38px 38px;padding:25px 23px 16px;box-shadow:0 25px 35px #26383026,0 6px 0 #17202a, inset 0 2px 2px #ffffff22}.brand{color:#f4f2e9;font-size:20px;font-weight:700;display:flex;align-items:center;gap:12px}.brand i{font-size:13px;font-weight:400;color:#c3ccd2}.brand>span{margin-left:auto;font-size:7px;letter-spacing:1px;color:#a5b2ba}.screen{background:#c8d2bb;border:6px solid #1d2730;border-radius:9px;margin-top:20px;padding:8px 12px 12px;color:#28382b;box-shadow:inset 0 3px 6px #32433135}.status{display:flex;align-items:center;height:20px;font:10px monospace;gap:15px}.status button{border:0;background:none;color:inherit;font:inherit;padding:0}.solar{margin-left:auto;color:#6b7960}input{width:100%;border:none;background:none;outline:none;text-align:left;font:21px monospace;color:#28382b;margin-top:14px}output{display:block;overflow-x:auto;text-align:right;font:32px monospace;min-height:49px;padding-top:11px;white-space:nowrap}.controls{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:19px 0 14px}.controls button{border-radius:20px;border:1px solid #60717e;background:#465665;color:#dce5e7;height:29px;font-size:11px;box-shadow:0 3px #15202a}.controls button:first-child{color:#edc878}.controls button.active{background:#b88d35;color:#fff}.keys{display:grid;grid-template-columns:repeat(6,1fr);gap:12px 9px}.key-wrap{padding-top:12px;position:relative}.hint{position:absolute;top:-2px;left:0;right:0;text-align:center;color:#e8bd70;font-size:9px}.keys button{width:100%;height:31px;border:0;border-radius:6px 6px 9px 9px;background:#17232e;color:#e9ebed;font-size:12px;box-shadow:0 3px #101820,inset 0 1px #ffffff19}.numbers{margin-top:20px;display:grid;grid-template-columns:repeat(5,1fr);gap:13px 11px}.numbers button{height:43px;background:#e5e8e8;border:0;border-radius:7px 7px 11px 11px;color:#26333f;font-size:21px;box-shadow:0 4px #9da8ad,inset 0 1px #fff}.numbers button.orange{background:#c89568;box-shadow:0 4px #826042;color:#fff;font-size:15px}.numbers button.equals{background:#8bb7a9;box-shadow:0 4px #4b8073}.numbers button:active,.keys button:active{transform:translateY(2px);box-shadow:none}button:focus-visible{outline:2px solid #c4a05e;outline-offset:3px}.foot{margin-top:22px;font-size:7px;letter-spacing:2px;color:#778993;display:flex;justify-content:space-between}.foot span{color:#9eafa8}aside{padding-top:30px}.history-title{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #d9ded5;padding-bottom:13px}h2{font-size:14px;font-weight:500}.history-title button{border:0;background:none;color:#829087;font-size:11px}.empty{font-size:12px;line-height:2;color:#6e7d73;padding:27px 0 90px}.empty span{font-size:11px;color:#9ba39b}.record{width:100%;border:0;border-bottom:1px solid #dde2d9;background:none;text-align:left;padding:15px 0;color:#778078;font-family:monospace}.record strong{display:block;text-align:right;margin-top:8px;color:#345c4e;font-size:18px}#history{max-height:310px;overflow:auto}.example{margin-top:30px}.example>span{font-size:10px;color:#929c92;letter-spacing:1px}.example button{display:block;width:100%;margin-top:12px;background:#e9ede5;border:1px solid #dce3d7;border-radius:6px;text-align:left;padding:12px;color:#4d685b;font-family:monospace}.example b{float:right;font-weight:400}footer{margin:0 5%;border-top:1px solid #daddd5;padding:25px 0;display:flex;justify-content:space-between;font-size:10px;color:#939c92}footer span{font-size:9px;letter-spacing:2px}@media(max-width:1100px){main{grid-template-columns:1fr 370px;gap:35px}aside{grid-column:1/-1;max-width:750px;width:100%;display:none}}@media(max-width:700px){header{height:70px}header a span{font-size:10px;margin-left:12px}.tag{display:none}main{display:flex;flex-direction:column;align-items:center;margin:24px auto;padding:0 15px;gap:25px}.intro{padding:0;width:100%;text-align:center}.eyebrow,h1,.intro p,.tips,.intro small{display:none}details{margin:0 auto}.calculator{width:100%;max-width:390px}aside{display:block;max-width:390px;padding:15px}.empty{padding-bottom:10px}footer{margin-top:30px}footer span{display:none}}

.variables{margin-top:22px;border-top:1px solid #51606a;padding-top:16px}.variable-actions{display:flex;gap:8px}.variable-actions button{background:#465665;color:#e7eceb;border:1px solid #61737e;border-radius:6px;padding:7px 10px;font-size:11px}.variable-actions button.active{background:#b88d35;color:white}.variables p{font-size:11px;line-height:1.6;color:#d0d9d8;margin:10px 0}.variables small{display:block;color:#aab9bc;font-size:9px;margin-top:10px}#variableGrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}#variableGrid button{min-width:0;text-align:left;border:1px solid #4f646d;border-radius:6px;background:#1e3039;color:#e7bd79;padding:7px 8px;font-size:12px}#variableGrid span{display:block;color:#dce8df;font:12px monospace;overflow:auto;margin-top:4px}#cancelVariable[hidden]{display:none}
/* Silver handheld layout inspired by the reference hardware. */
.calculator{background:linear-gradient(105deg,#a4a7ac 0%,#e5e5e3 11%,#d1d2d1 70%,#a5a7ac);border:4px solid #42454c;border-radius:35px 35px 58px 58px;padding:22px 20px 23px;box-shadow:0 22px 35px #26383025,inset 0 2px 3px #fff}.brand{color:#282b2d}.brand i,.brand>span{color:#4d5154}.screen{background:#d1ded9;border:4px solid #a6adae;border-radius:8px;margin-top:18px}.controls{grid-template-columns:1fr 1fr 1.8fr 1fr 1fr;gap:6px;margin:20px 0 0;align-items:start;height:75px}.controls>button{background:#858a91;color:#25282b;border:1px solid #5b6068;height:32px;font-size:10px;margin-top:8px;box-shadow:0 2px #53585e}.controls>button:first-child{color:#69501c}.controls>#alpha{color:#9d392d}.controls small{font-size:7px;color:#735b30}.controls .active{background:#edd094!important}.replay{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:22px 22px 22px;border-radius:50%;background:#90949c;border:2px solid #737880;box-shadow:0 2px #555a62;padding:1px}.replay button{background:transparent;border:0;box-shadow:none;height:auto;padding:0;color:#4d5359;font-size:10px}.replay span{font-size:7px;align-self:center;justify-self:center}.replay #up{grid-column:2}.replay #left{grid-row:2;grid-column:1}.replay span{grid-row:2;grid-column:2}.replay #right{grid-row:2;grid-column:3}.replay #down{grid-row:3;grid-column:2}.special{display:grid;grid-template-columns:1fr 1fr 1.8fr 1fr 1fr;gap:8px;margin-bottom:17px}.special button{background:#51565f;color:white;border:0;border-radius:7px 7px 12px 12px;height:29px;box-shadow:0 2px #373c45;font-size:12px}.special button:disabled{background:#bd9775;color:#eee;cursor:not-allowed;opacity:.7}.keys{gap:14px 8px}.keys button{background:#535862;box-shadow:0 3px #353a44}.hint{color:#79632e;font-size:9px;text-align:left;padding-left:3px}.hint em{float:right;color:#ad4337;font-style:normal;font-weight:700;padding-right:3px}.numbers{gap:14px 10px}.numbers button{background:#353a43;color:#f7f8f8;box-shadow:0 3px #1f242d,inset 0 1px #777e86;height:42px}.numbers button.orange{background:#454950;color:#db9153;box-shadow:0 3px #272c34}.numbers button.equals{background:#353a43;color:#fff;box-shadow:0 3px #1f242d;font-size:18px}.variables{max-width:none;margin-bottom:0;border-color:#a0a5a7}.variables summary{color:#47545a;font-size:11px}.variables p{color:#4c575c}.variables small{color:#606c71}.variable-actions{margin-top:12px}.foot{color:#666f75;align-items:center}.foot button{font-size:10px;border:0;border-radius:4px;background:#b8c1c1;color:#3a4e4b;padding:5px 8px}.foot span{color:#63766b}#settings{padding:10px;border:1px solid #8a9698;border-radius:6px;background:#e1e6e1;font-size:11px;margin-bottom:12px}#settings button{margin:10px 4px 0 0;padding:6px;font-size:11px}#settings p{font-size:10px;line-height:1.6;color:#5b6964}#settings[hidden]{display:none}

.special button,.numbers button{position:relative}.special button small,.numbers button small{position:absolute;top:-13px;left:0;right:0;font-size:9px;color:#79632e;font-weight:400}.special{margin-top:8px}
/* Larger Latin type for the physical keys and display. */
.calculator button,.calculator input,.calculator output{font-family:'Arial','Helvetica Neue',sans-serif;font-weight:700}.screen input{font-size:26px;letter-spacing:.4px;min-height:34px}.screen output{font-size:36px;min-height:55px}.keys button{font-size:16px;height:37px}.hint{font-family:Arial,sans-serif;font-weight:700;font-size:11px;top:-4px}.numbers button{font-size:25px;height:47px}.numbers button.equals{font-size:20px}.numbers button.orange{font-size:18px}.special button{font-size:16px;height:32px}.controls>button{font-size:11px}.controls small{font-size:8px}.replay button{font-size:14px}.replay span{font-size:8px}.special button small,.numbers button small{font-size:11px}.screen{position:relative}.status{min-height:24px}.status #errorInfo{margin-left:auto;font-family:Arial,'Noto Sans TC',sans-serif;font-size:11px;font-weight:500;white-space:nowrap;color:#394c3e}.status #errorInfo[hidden],#errorReason[hidden]{display:none}#errorReason{position:absolute;z-index:3;top:28px;left:8px;right:8px;padding:12px;background:#f0f3dc;border:1px solid #6b7c60;border-radius:5px;color:#34402e;font-size:12px;line-height:1.6;box-shadow:0 4px 9px #26383030}.error-mode .screen input{font-size:27px;font-weight:700}.error-mode .status> :not(#errorInfo){visibility:hidden}.error-mode button:disabled{opacity:.25;filter:grayscale(1);cursor:default}.error-mode .hint{opacity:.25}.error-mode .variables{opacity:.3;pointer-events:none}.error-mode .replay{outline:3px solid #c38d35;outline-offset:3px;box-shadow:0 0 14px #e2ae5777;background:#c9c6b5}.error-mode .replay span{font:700 12px Arial,'Noto Sans TC',sans-serif;color:#503b12;white-space:nowrap}.error-mode #ac,.error-mode #on{background:#e9ca8f;color:#483719;opacity:1;font-family:Arial,'Noto Sans TC',sans-serif}.error-mode #on{font-size:13px}@media(max-width:380px){.calculator{padding-left:13px;padding-right:13px}.keys{gap:14px 6px}.keys button{font-size:15px}.screen input{font-size:24px}}
.formula-editor{position:relative;overflow:hidden;margin-top:14px;min-height:38px}.screen .formula-editor input,#formulaPaint{font-family:'DejaVu Sans Mono','Menlo','Consolas',monospace;font-weight:700;font-size:26px;letter-spacing:0;line-height:38px;margin:0;padding:0;border:0;white-space:pre}.screen .formula-editor input{position:relative;z-index:1;color:transparent;caret-color:#28382b;width:100%;background:transparent}.screen .formula-editor input::selection{background:#99b8cc77;color:transparent}#formulaPaint{position:absolute;left:0;top:0;pointer-events:none;color:#28382b;min-width:100%}.memory-token{color:#b5393e}.constant-token{color:#216cba}.constant-token:where(span,em){font-weight:800;font-style:italic}.exponent-token{display:inline-block;font-size:.72em;width:1.389ch;vertical-align:baseline}.incomplete-token{color:#89908b}.error-mode .formula-editor input{color:transparent;font-size:26px}.error-mode #formulaPaint{color:#28382b}#suggestions{display:flex;gap:5px;flex-wrap:wrap;padding-top:8px}#suggestions[hidden],#constants[hidden]{display:none}#suggestions button{border:1px solid #8b9e87;border-radius:5px;background:#e8efe0;color:#344b38;font-size:11px;padding:5px 7px;line-height:1.5}#constants{margin:10px 0;padding:12px;background:#dce5e8;border:1px solid #92aab8;border-radius:7px;font-size:12px}#constants button{display:block;width:100%;margin-top:8px;border:1px solid #91a7ba;border-radius:5px;padding:10px 5px;color:#216cba;background:#f0f4f7;font-size:13px}#constants small{display:block;margin-top:10px;font-size:10px}#constants a{color:#42657c}.hint .constant-token{color:#216cba}.screen #result{font-family:'Menlo','Consolas',monospace}

.euler-token{font-family:Georgia,serif;font-style:italic;font-weight:900;display:inline-block;width:1ch;font-size:1em}.formula-editor:has(input.composing) #formulaPaint{visibility:hidden}.screen .formula-editor input.composing{color:#28382b}

.euler-token{font-family:inherit;width:1ch}.euler-token i{font-family:Georgia,serif;font-weight:900;font-style:italic}
.formula-editor{min-height:38px}.formula-editor:has(.function-note){min-height:48px}.function-note{position:absolute;top:31px;left:50%;transform:translateX(-50%);font:500 9px/16px Arial,'Noto Sans TC',sans-serif;letter-spacing:0;color:#687b69;white-space:nowrap;pointer-events:none}#formulaPaint>span{position:relative}#formulaPaint .short-minus{display:inline-block;width:1ch;color:transparent}#formulaPaint .short-minus::after{content:'';position:absolute;top:19px;left:30%;width:32%;height:2px;background:#28382b}#formulaPaint .long-minus{font-weight:900;display:inline-block;width:1ch;transform:scaleX(1.12)}.incomplete-symbol{text-decoration-line:underline;text-decoration-color:#28382b;text-decoration-thickness:2px;text-underline-offset:5px}.value-placeholder{display:inline-block;width:16px;height:23px;margin-left:6px;vertical-align:-3px;background:#9aa29a;border-radius:1px}.mode-badge{display:inline-flex;align-items:center;justify-content:center;background:#354a39;color:#d1ded9;font:800 12px Arial,sans-serif;width:18px;height:18px;border-radius:1px}.hint .alpha-letter{color:#ad4337!important}.result-row{display:flex;align-items:center;gap:10px}.result-row output{flex:1;min-width:0}.result-row #formulaPrompt{font:700 25px Georgia,serif;color:#28382b;white-space:nowrap}.result-row #formulaPrompt sup{font-size:13px}.result-row #formulaPrompt sub{font-size:15px}.result-row #formulaPrompt[hidden],#formulaArrows[hidden],#formulaHelp[hidden]{display:none}#formulaArrows{position:absolute;right:0;top:0;z-index:2;background:#d1ded9;font-size:18px;color:#536853;line-height:35px;padding-left:4px}#formulaHelp{font-size:10px;line-height:1.65;color:#61715f;margin:5px 0 0}.formula-editor:has(#formulaArrows:not([hidden])){padding-right:20px}dialog#constants{position:fixed;inset:0;margin:auto;width:min(340px,90vw);max-height:80vh;padding:24px;border:1px solid #91a7ba;box-shadow:0 15px 55px #152a4444;color:#293d4b;background:#eef3f5}dialog#constants::backdrop{background:#18252c88;backdrop-filter:blur(3px)}dialog#constants #constantClose{position:absolute;right:8px;top:5px;width:auto;padding:3px 9px;margin:0;background:transparent;border:0;font-size:24px;color:#435d6c}#fmla{background:#c58c52}.error-mode .mode-badge{visibility:hidden}
.keys button{height:48px;line-height:20px;padding:4px 1px}.keys button .key-description{display:block;font:500 9px/13px Arial,'Noto Sans TC',sans-serif;color:#c6cdd3;white-space:nowrap;letter-spacing:0}.function-note{opacity:.9}

/* Keep the answer close to the expression, with room for function captions. */
.screen .result-row output{padding-top:2px;min-height:44px;line-height:42px}

#replayStatus{font:16px/20px Arial,sans-serif}#replayStatus[hidden]{display:none}

/* Text triangles share the fixed right edge of the formula row. */
.formula-editor :is(#replayStatus,#formulaArrows){position:absolute;right:0;top:0;z-index:2;display:flex;align-items:center;justify-content:center;white-space:pre;text-align:center;width:20px;height:38px;padding:0;background:#d1ded9;color:#000;font:900 12px/13px Arial,sans-serif;pointer-events:none}
.formula-editor :is(#replayStatus,#formulaArrows)[hidden]{display:none}
.formula-editor:has(.navigation-triangles:not([hidden])){padding-right:22px}

.formula-editor :is(#replayStatus,#formulaArrows){top:1px;width:13px;height:20px;font:900 9px/9px Arial,sans-serif;align-items:flex-start}
.formula-editor:has(.navigation-triangles:not([hidden])){padding-right:15px}
.keys button{height:37px;line-height:25px;padding:4px 1px;touch-action:manipulation;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
#keyHelp{position:fixed;z-index:20;bottom:24px;left:50%;transform:translateX(-50%);max-width:90vw;padding:12px 18px;border-radius:8px;background:#202b32;color:#fff;font:600 14px/1.6 Arial,'Noto Sans TC',sans-serif;box-shadow:0 4px 18px #0004;pointer-events:none;white-space:nowrap}#keyHelp[hidden]{display:none}

/* Suggestions float beside the caret without changing the LCD height. */
.formula-editor,.formula-editor:has(.function-note){min-height:38px}
#suggestions{position:absolute;z-index:10;display:flex;flex-direction:column;gap:2px;width:max-content;max-width:calc(100% - 16px);max-height:230px;overflow:auto;padding:5px;background:#f2f4ee;border:1px solid #a3afa4;border-radius:7px;box-shadow:0 5px 14px #26383030}
#suggestions button{display:flex;align-items:center;justify-content:flex-start;gap:9px;width:100%;border:0;background:transparent;border-radius:4px;padding:6px 8px;text-align:left;white-space:nowrap}
#suggestions button:hover,#suggestions button:focus-visible{background:#dfe8dc}
#suggestions .suggestion-command{font:italic 600 14px/1.4 Menlo,Consolas,monospace;color:#293b31;min-width:4ch}
#suggestions kbd{display:inline-block;border:1px solid #929d96;border-radius:5px;padding:2px 5px;min-width:26px;text-align:center;color:#28382b;background:#e1e5df;font:700 13px/1.3 Arial,sans-serif}
#suggestions .suggestion-explanation{font:400 11px/1.5 Arial,'Noto Sans TC',sans-serif;color:#7a827c;white-space:normal}

#formulaPaint .incomplete-symbol,#formulaPaint .incomplete-token{text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:#2876d2;text-decoration-thickness:1.5px;text-underline-offset:5px}
#formulaPaint .syntax-issue{pointer-events:auto;cursor:help;z-index:2}
#formulaPaint .leading-placeholder{width:16px;margin-left:0;margin-right:6px}
#formulaPaint .syntax-issue:focus-visible{outline:1px solid #2876d2;outline-offset:2px}
#syntaxHelp{position:absolute;z-index:12;left:8px;right:8px;padding:12px 32px 12px 12px;background:#f5f8fc;border:1px solid #8eb4e3;border-radius:7px;box-shadow:0 5px 15px #26383030;color:#334863;font:13px/1.6 Arial,'Noto Sans TC',sans-serif}
#syntaxHelp[hidden]{display:none}#syntaxClose{position:absolute;right:5px;top:3px;border:0;background:transparent;color:#496482;font-size:21px;padding:0 5px}

/* Fixed LCD rows: status, expression/caption, answer, formula description. */
.screen{height:172px;min-height:172px;max-height:172px;overflow:visible;display:grid;grid-template-rows:24px 55px 44px 21px;padding:8px 12px;border-width:4px;gap:0;min-width:0}
.formula-editor,.formula-editor:has(.function-note){height:55px;min-height:55px;max-height:55px;margin:0;grid-row:2}
.status{grid-row:1;min-width:0}.result-row{grid-row:3;min-height:44px;height:44px;overflow:hidden}.screen #result{white-space:pre;overflow-x:auto;overflow-y:hidden;height:44px;min-height:44px;max-height:44px}
#formulaHelp{grid-row:4;margin:0;height:21px;line-height:21px;overflow-x:auto;overflow-y:hidden;white-space:nowrap;font-size:10px;min-width:0}
#formulaPaint{z-index:3;pointer-events:none}.screen .formula-editor input{z-index:1;max-height:38px}.function-note{left:0;transform:none;top:34px;font-size:9px;line-height:14px;max-width:130px;overflow:hidden;text-overflow:ellipsis;color:#687b69;pointer-events:none}
#formulaPaint .syntax-issue{position:relative;z-index:4;pointer-events:auto;touch-action:manipulation}
.formula-editor :is(#formulaArrows,#replayStatus){z-index:5}
.memory-token{color:#b5393e}.constant-token{color:#216cba}.function-token{color:#bb641c}
#suggestions .memory-token :is(.suggestion-command,kbd){color:#b5393e}#suggestions .constant-token :is(.suggestion-command,kbd){color:#216cba}#suggestions .function-token :is(.suggestion-command,kbd){color:#bb641c}
.suggestion-heading{font:600 11px/1.5 Arial,'Noto Sans TC',sans-serif;padding:3px 8px;text-align:left}
.calculator button.shift-available{outline:2px solid #df8a25;outline-offset:2px}.calculator button.alpha-available{outline:2px solid #c84141;outline-offset:2px}
.error-mode button.shift-available,.error-mode button.alpha-available{outline:none}
.info-circle{display:inline-flex;width:16px;height:16px;align-items:center;justify-content:center;border:1.5px solid currentColor;border-radius:50%;font:700 12px/1 Georgia,serif}.status #errorInfo{width:20px;height:20px;padding:0;flex-shrink:0}
.formula-editor:has(input.composing) #formulaPaint{visibility:visible}.screen .formula-editor input.composing{color:transparent}
#syntaxHelp,#suggestions,#errorReason{max-height:230px;overflow:auto}

#errorReason{z-index:15}

#errorReason{top:94px;margin:0}
.calculator button:is(.shift-available,.alpha-available){outline:none;filter:brightness(1.28)}
.calculator button:is(.shift-available,.alpha-available):focus-visible{outline:2px solid #c4a05e;outline-offset:3px}
.error-mode button:is(.shift-available,.alpha-available){filter:grayscale(1)}

#formulaPaint .function-token,#formulaPaint .function-close{color:#bb641c}
#formulaPaint .pending-function{background:#efc77e80;border-radius:3px;box-shadow:inset 0 -2px #c58c52}
/* Consistent scientific notation and a centered fraction separator. */
#formulaPaint .exponent-token{font-size:1em;width:1ch;transform:scale(.72);transform-origin:center baseline}
#formulaPaint .fraction-token{display:inline-block;width:1ch;text-align:center;text-indent:.35em}
.calculator .keys button,.calculator .numbers button,.calculator .special button{font-family:'DM Sans','Helvetica Neue',Arial,sans-serif;font-weight:600;letter-spacing:0}
.keys{gap:14px 9px}.key-wrap{padding-top:17px}.keys button{height:41px;font-size:19px;line-height:29px}
.hint{font:600 12px/16px 'DM Sans',Arial,sans-serif;top:-1px}.hint em{font-size:13px}
.special button{font-size:18px}.special button small,.numbers button small{font-size:12px;line-height:15px}
.numbers{gap:12px 9px}.numbers button{font-size:26px;height:49px}.numbers button:nth-child(9),.numbers button:nth-child(10),.numbers button:nth-child(14),.numbers button:nth-child(15){font-size:32px;font-weight:500}
.controls button{font-family:'DM Sans',Arial,sans-serif;font-weight:700}#shift,#alpha{font-size:12px}
#graphButton{position:absolute;right:0;top:0;z-index:6;width:27px;height:27px;padding:3px;border:1px solid #829487;border-radius:5px;background:#d1ded9;color:#354a39}#graphButton svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}#graphButton[hidden]{display:none}.formula-editor:has(#graphButton:not([hidden])){padding-right:30px}
#formulaModal{position:fixed;inset:0;margin:auto;width:min(620px,calc(100vw - 28px));max-height:85dvh;overflow:auto;padding:28px;border:1px solid #abb8bd;border-radius:18px;background:#f3f6f7;color:#25363f;box-shadow:0 24px 90px #10202d55;font-family:'DM Sans',Arial,sans-serif}#formulaModal[hidden]{display:none}#formulaModal::backdrop{background:#18252c99;backdrop-filter:blur(3px)}#formulaModalClose{position:absolute;right:12px;top:10px;border:0;background:transparent;color:#405866;font-size:28px;width:36px;height:36px}#formulaModal h2{margin:0 35px 24px 0;font-size:18px}#formulaModal p{font-size:14px;line-height:1.8}#formulaModal small{font-size:12px;color:#687c86}.original-formula{font:600 21px/1.8 'DM Sans',Arial,sans-serif;margin:18px 0;overflow-x:auto;white-space:nowrap}.quadratic-plot{display:block;width:100%;height:auto}.graph-roots{display:flex;flex-wrap:wrap;gap:24px;margin:18px 0;font-size:18px;color:#b5393e}.graph-equation{overflow-wrap:anywhere}
/* Compact keypad, with larger legends and a baseline-aligned EXP marker. */
#formulaPaint .exponent-token{transform:scale(.72);transform-origin:50% 80%;text-align:center;vertical-align:baseline}
.calculator{padding:18px 20px 17px}.screen{margin-top:13px}
.controls{margin-top:12px;height:62px;gap:5px}.controls>button{margin-top:5px;height:29px}.replay{grid-template-rows:18px 18px 18px}
.special{margin-top:5px;margin-bottom:12px;gap:7px}.special button{height:29px}
.keys{gap:8px 7px}.key-wrap{padding-top:16px}.keys button{height:33px;line-height:25px;padding:3px 1px;font-size:19px}
.hint{top:0;font-size:13px;line-height:15px;padding-left:1px}.hint em{font-size:14px;padding-right:1px}
.special button small,.numbers button small{font-size:13px;line-height:14px;top:-14px}
.numbers{margin-top:17px;gap:8px 7px}.calculator .numbers button{height:40px;font-size:29px;line-height:36px;padding:0 1px}.calculator .numbers button.orange,.calculator .numbers button.equals{font-size:24px}.calculator .numbers button:is(:nth-child(9),:nth-child(10),:nth-child(14),:nth-child(15)){font-size:34px}.calculator .numbers button:nth-child(18){font-size:24px}.calculator .numbers button:nth-child(19){font-size:25px}
.variables{margin-top:15px;padding-top:11px}.foot{margin-top:13px}#shift,#alpha{font-size:13px}.mode-badge{width:20px;height:20px;font-size:14px}
#formulaPaint .radical-content::before{content:'';position:absolute;left:0;right:0;top:calc(4px + (var(--radical-level,1) - 1)*3px);height:1.5px;background:#bb641c;pointer-events:none}#formulaPaint .radical-start::before{left:.8ch}#formulaPaint .value-placeholder.radical-content::before{top:-6px;left:-6px}
.keys .root-key{position:relative}.keys .root-key::after{content:'';position:absolute;width:9px;height:1.5px;left:50%;top:8px;background:currentColor}
#formulaPaint .exponent-token{transform:none}#formulaPaint .exponent-glyph{display:inline-block;width:1ch;transform:scale(.72);transform-origin:50% 80%;text-align:center}
#formulaPaint .exponent-token.radical-content::before{top:calc(8px + (var(--radical-level,1) - 1)*3px)}
/* Center the visible corner, not the font's full-width punctuation box. */
#formulaPaint .fraction-token,#result .fraction-token{position:relative;display:inline-block;width:1ch;height:1em;vertical-align:-.12em;line-height:1;text-indent:0;transform:none;color:transparent;text-align:center}
#formulaPaint .fraction-token::after,#result .fraction-token::after{content:'';position:absolute;left:50%;top:50%;width:.46ch;height:.58em;border-right:1.7px solid #28382b;border-bottom:1.7px solid #28382b;transform:translate(-50%,-50%)}
/* One continuous bar over a root, regardless of the spans inside it. */
#formulaPaint .radical-content::before,.keys .root-key::after{content:none}
.root-vector{position:relative;display:inline-block;width:1em;height:1.15em;vertical-align:-.17em;color:transparent;line-height:1;flex:none}
.root-vector::after{content:'';position:absolute;inset:0;background:currentColor;color:inherit;mask:url('root.svg') center/100% 100% no-repeat;-webkit-mask:url('root.svg') center/100% 100% no-repeat}
.keys .root-vector::after,.special .root-vector::after{background:#e9ebed}.hint .root-vector::after,.special small .root-vector::after{background:#79632e}.root-index{position:absolute;left:-.03em;top:-.1em;font:700 .52em/1 Arial,sans-serif;color:#79632e}
#formulaPaint .root-vector{width:1ch;height:1em;vertical-align:-.1em}#formulaPaint .root-vector::after{background:#bb641c}#formulaPaint .root-index{color:#bb641c}#formulaPaint .root-overbar{position:absolute;height:1.6px;background:#bb641c;pointer-events:none}
#suggestions .root-vector::after{background:#bb641c}
.keys button{display:flex;align-items:center;justify-content:center;padding:0 1px}.keys .root-vector{width:22px;height:26px}.hint .root-vector,.special small .root-vector{width:15px;height:17px;vertical-align:-3px}.hint .root-index{font-size:9px;top:0}
.fraction-key-label{display:inline-flex;align-items:center;justify-content:center;width:2ch;gap:0;font-family:Menlo,Consolas,monospace;font-size:22px;line-height:1}.fraction-key-label>span:first-child{width:1ch;font-size:1em}.fraction-key-label .bc-label{display:inline-block;width:2.2ch;font-size:.46em;letter-spacing:-.08em;white-space:nowrap}
.comma-vector,.dms-vector{display:inline-block;position:relative;color:transparent;height:24px;line-height:24px}.comma-vector{width:18px}.dms-vector{width:40px}.comma-vector::after,.dms-vector::after{content:'';position:absolute;inset:0;background:#e9ebed;mask-position:center;mask-size:contain;mask-repeat:no-repeat;-webkit-mask-position:center;-webkit-mask-size:contain;-webkit-mask-repeat:no-repeat}.comma-vector::after{mask-image:url('comma.svg');-webkit-mask-image:url('comma.svg')}.dms-vector::after{mask-image:url('dms.svg');-webkit-mask-image:url('dms.svg')}
.numbers{row-gap:15px;column-gap:9px}.numbers button small{top:-14px;height:13px;line-height:13px;font-size:12px}.keys{row-gap:5px}.hint{top:-1px}.special{margin-bottom:10px}
#formulaPaint .fraction-token,#result .fraction-token{width:1em}#formulaPaint .fraction-token::after,#result .fraction-token::after{width:.42em}
#formulaPaint .root-vector{height:1.25em}
#formulaPaint .root-vector{height:1em;transform:translateY(-6px)}
/* Balanced mixed-fraction key and a dedicated, centered LCD separator. */
.fraction-key-label{width:2ch;gap:2px;font-family:'DM Sans',Arial,sans-serif;font-size:20px;font-weight:600;line-height:1;align-items:center}
.fraction-key-label>span:first-child{width:auto;font-size:20px;line-height:1}
.fraction-key-label .bc-label{display:grid;grid-template-rows:1fr 1fr;width:11px;font-size:11px;line-height:11px;letter-spacing:0;text-align:center;font-weight:600}
.bc-label>span:first-child{border-bottom:1.2px solid currentColor;padding-bottom:1px}.bc-label>span:last-child{padding-top:1px}
#formulaPaint .fraction-token::after,#result .fraction-token::after{inset:0;width:100%;height:100%;transform:none;border:0;background:#28382b;mask:url('fraction-separator.svg?v=25') center/contain no-repeat;-webkit-mask:url('fraction-separator.svg?v=25') center/contain no-repeat}
#formulaPaint .fraction-token,#result .fraction-token{vertical-align:0}

.fraction-key-label{width:auto;gap:0;align-items:baseline;font-size:19px;line-height:1;white-space:nowrap}.fraction-key-label>span:first-child{font-size:19px;width:auto}.fraction-key-label .bc-label{display:inline;width:auto;font-size:16px;line-height:1;letter-spacing:0;font-weight:600}

/* Fine alignment of the fraction symbols. */
#formulaPaint .fraction-token::after,#result .fraction-token::after{transform:translateY(2px)}
.fraction-key-label>span:first-child{font-size:21px;transform:translateY(-1px)}
.fraction-key-label .bc-label{font-size:15px;transform:translateY(1.5px)}

#formulaPaint .fraction-token::after,#result .fraction-token::after{transform:translateY(3.5px)}

#formulaPaint .completion-pending{color:#89908b;text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:#d4434b;text-decoration-thickness:1.5px;text-underline-offset:5px}

#suggestions.variant-suggestions{background:#edf0fc;border-color:#a4aed7;box-shadow:0 5px 14px #343b6730}
#suggestions.variant-suggestions button:hover,#suggestions.variant-suggestions button:focus-visible{background:#dce2f6}
#suggestions.variant-suggestions .suggestion-heading{color:#636e9b}
#suggestions .suggestion-shortcut{margin-left:auto;min-width:22px;color:#59658e;background:#e1e6f6;border-color:#b4bedb;flex-shrink:0;font-size:12px}

#suggestions .suggestion-shortcuts{display:flex;align-items:center;gap:4px;margin-left:auto;color:#bb641c;white-space:nowrap}#suggestions .suggestion-shortcut{margin-left:0;border:1px solid currentColor;background:transparent;color:inherit}#formulaPaint .euler-token.constant-token{color:#216cba;font-style:italic;font-weight:800}

/* Keep the caret cell intact while placing the power base lower. */
#formulaPaint .power-ten-base{display:inline-block;width:2ch;font-size:1em;transform:translateY(5px) scale(.86);transform-origin:left center}
#formulaPaint .euler-glyph{font-family:Georgia,'Times New Roman',serif;font-style:italic;font-weight:900}
#formulaPaint .euler-glyph.constant-token{color:#216cba}
/* Draw the fraction corner directly, without an external image mask. */
#formulaPaint .fraction-token,#result .fraction-token{width:1ch;height:1em;vertical-align:baseline}
#formulaPaint .fraction-token::after,#result .fraction-token::after{inset:auto;left:50%;top:50%;width:.29em;height:.29em;box-sizing:border-box;border:0;border-right:3px solid #28382b;border-bottom:3px solid #28382b;background:none;mask:none;-webkit-mask:none;transform:translate(-50%,-50%) translateY(3.5px)}

#touchCaret{position:absolute;z-index:4;top:5px;height:29px;width:2px;background:#28382b;pointer-events:none;animation:touch-caret-blink 1s step-end infinite}#touchCaret[hidden]{display:none}@keyframes touch-caret-blink{50%{opacity:0}}@media(prefers-reduced-motion:reduce){#touchCaret{animation:none}}

#suggestions button.automatic-suggestion{background:#f5dfbd;box-shadow:inset 3px 0 #bd6b27}#suggestions button.automatic-suggestion:hover,#suggestions button.automatic-suggestion:focus-visible{background:#efd1a5}

#suggestions button.memory-token.automatic-suggestion{background:#f4dadd;box-shadow:inset 3px 0 #b5393e}#suggestions button.constant-token.automatic-suggestion{background:#d9e9f8;box-shadow:inset 3px 0 #216cba}#suggestions button.function-token.automatic-suggestion{background:#f5dfbd;box-shadow:inset 3px 0 #bb641c}
#suggestions .suggestion-status{margin-left:auto;font:600 10px/1.4 Arial,sans-serif;white-space:nowrap;color:inherit}#suggestions button.memory-token .suggestion-status{color:#b5393e}#suggestions button.constant-token .suggestion-status{color:#216cba}#suggestions button.function-token .suggestion-status{color:#bb641c}
#suggestions.reciprocal-suggestions{background:#edf7e9;border-color:#9ab895}#suggestions.reciprocal-suggestions button.function-token.automatic-suggestion{background:#cfe8c6;box-shadow:inset 3px 0 #548747}#suggestions.reciprocal-suggestions :is(.suggestion-heading,.suggestion-command,kbd,.suggestion-status){color:#548747!important}

/* A shared visual caret follows painted glyphs rather than hidden input widths. */
.screen .formula-editor input{caret-color:transparent}#formulaPaint{z-index:2}#touchCaret{z-index:20}
#formulaPaint .incomplete-token,#formulaPaint .completion-pending{color:#28382b}#formulaPaint .completion-pending{text-decoration-color:#d4434b}
#completionGhost{position:absolute;z-index:3;top:0;pointer-events:none;white-space:pre;color:#89908b;font:700 26px/38px 'DejaVu Sans Mono',Menlo,Consolas,monospace}#completionGhost[hidden]{display:none}
#formulaPaint .value-placeholder{margin-left:6px;margin-right:0;background:none;height:28px;width:16px;vertical-align:-5px;text-decoration:none}
#formulaPaint .value-placeholder::after{content:'';position:absolute;left:0;top:1px;width:16px;height:23px;border-radius:1px;background:#9aa29a}
#formulaPaint .value-placeholder.syntax-issue::before{content:'';position:absolute;left:-6px;right:0;top:auto;bottom:-2px;height:4px;background:none;border:0;border-bottom:1.5px solid #2876d2;mask:none;text-decoration:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='4' viewBox='0 0 8 4'%3E%3Cpath d='M0 2Q2 -1 4 2T8 2' fill='none' stroke='%232876d2' stroke-width='1.5'/%3E%3C/svg%3E");border-bottom:0;background-repeat:repeat-x}
#formulaPaint .leading-placeholder{margin-left:6px;margin-right:6px}
#formulaPaint .pending-function{background:#dce2f6;color:#636094;border-radius:3px;box-shadow:inset 0 -2px #a19ac7}
#suggestions.variant-suggestions button.automatic-suggestion{background:#dce2f6;box-shadow:inset 3px 0 #8b83b8}#suggestions.variant-suggestions button.automatic-suggestion .suggestion-status{color:#71679c}

#formulaPaint .pending-function{color:#bb641c}
#formulaPaint .value-placeholder,#formulaPaint .leading-placeholder{width:1ch;height:28px;margin:0 0 0 2px;vertical-align:-5px}
#formulaPaint .value-placeholder::after{width:100%;height:23px}
#touchCaret.rewrite-caret{top:29px;height:3px;border-radius:0}
#formulaPaint .syntax-issue:not(.completion-pending){text-decoration:none}
#formulaPaint .value-placeholder.syntax-issue::before{display:none}
#syntaxWaves{position:absolute;z-index:5;left:0;right:0;top:32px;height:4px;pointer-events:none}
.continuous-syntax-wave{position:absolute;top:0;height:4px;background-repeat:repeat-x;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='4' viewBox='0 0 8 4'%3E%3Cpath d='M0 2Q2 -1 4 2T8 2' fill='none' stroke='%232876d2' stroke-width='1.5'/%3E%3C/svg%3E")}