@charset "UTF-8";
:root{color-scheme:light;--paper:#eeeae1;--ink:#363b35;--muted:#797c73;--accent:#b25b3e;--line:#d8d5cb;--mono:'Cascadia Code','Consolas','Courier New',monospace;--sans:'Segoe UI',Arial,sans-serif}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font:14px/1.5 var(--sans);min-width:320px}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #b96549;outline-offset:5px}button:disabled{cursor:default;opacity:.32}a{color:inherit}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.skip{position:fixed;left:12px;top:-80px;z-index:10;background:#fff;padding:12px}.skip:focus{top:12px}
.page-header{max-width:1120px;margin:0 auto;padding:27px 35px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.wordmark{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:23px;font-weight:600;letter-spacing:-.9px}.brand-icon{display:grid;place-content:center;width:34px;height:34px;border:1px solid var(--ink);border-radius:8px;font:italic 30px/.8 Georgia,serif;padding:0 3px 5px 0}.edition{border-left:1px solid #c8c7bc;margin-left:10px;padding-left:19px;font:10px var(--mono);letter-spacing:1.5px;color:var(--muted)}.header-actions{display:flex;gap:26px}.text-button{border:0;background:none;color:#5f645b;display:flex;align-items:center;gap:8px;font-size:12px;padding:8px 0}.text-button:hover{color:var(--accent)}.status-dot{height:5px;width:5px;border-radius:50%;background:#a6a79c;margin-left:2px}.text-button[aria-pressed=true] .status-dot{background:#b06343}.help-icon{font:12px var(--mono);border:1px solid currentColor;width:18px;height:18px;display:grid;place-content:center;border-radius:50%}
main{max-width:1010px;margin:0 auto;padding:42px 35px 0}.intro{display:flex;justify-content:space-between;align-items:flex-end;margin:0 0 30px}.eyebrow{font:9px/1.5 var(--mono);letter-spacing:1.7px;margin:0 0 13px;color:var(--muted)}h1{font:400 39px/1.1 Georgia,'Times New Roman',serif;letter-spacing:-.9px;margin:0}h1 em{font-weight:400;color:#777e6f}.intro-note{font-size:12px;line-height:1.7;color:var(--muted);margin:0 0 2px;padding-right:25px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 308px;gap:54px;align-items:start}.device-space{position:relative;padding:24px 28px 0;background:radial-gradient(ellipse at 50% 62%,#d3d0c344,transparent 70%);min-width:0}.desk-label{position:absolute;top:3px;left:4px;display:flex;flex-direction:column;font:7px/1.7 var(--mono);letter-spacing:1.5px;color:#92968a;transform:rotate(-90deg) translateX(-100%);transform-origin:0 0;white-space:nowrap}
.calculator{background:linear-gradient(120deg,#d4d5c8 0,#c5c8b9 45%,#b4b8a7 100%);padding:25px 23px 14px;border-radius:21px 21px 27px 27px;border:1px solid #dce0d0;box-shadow:inset 2px 2px 3px #f4f5e9b0,inset -2px -3px 3px #6d766259,0 7px 0 #8e9480,0 9px 0 #737b68,0 19px 23px #4a49352e,0 40px 45px -24px #524f4550;max-width:425px;margin:auto;position:relative}.calculator:focus{outline:none}.machine-top{display:flex;justify-content:space-between;align-items:center;padding:1px 2px 17px}.machine-brand{font:italic 24px Georgia,serif;letter-spacing:-1px;color:#424a3d}.machine-brand span{display:block;font:7px var(--mono);letter-spacing:1.2px;margin-top:5px;font-style:normal;color:#737b67}.grooves{display:flex;gap:4px;padding:0 3px}.grooves i{display:block;width:3px;height:22px;background:#848e7650;box-shadow:1px 0 0 #e6eadd8c;transform:skew(-16deg);border-radius:2px}.screen-bezel{padding:11px 12px 13px;background:linear-gradient(150deg,#343a31,#474d3f);border-radius:8px;box-shadow:0 1px 1px #ebf0dfaa,inset 0 2px 4px #0006}.screen{height:110px;padding:9px 13px 5px;background:radial-gradient(ellipse at 60% 5%,#453824,#201e16 80%);border-radius:3px;box-shadow:inset 0 3px 6px #0009;display:flex;flex-direction:column;color:#efb56d;position:relative;overflow:hidden}.screen:after{content:'';position:absolute;inset:0;pointer-events:none;background:linear-gradient(125deg,#ffffff05,transparent 45%)}.screen-meta{display:flex;align-items:center;min-height:17px;gap:10px;font:9px var(--mono);color:#e4b471a1}.screen-meta #memory-indicator{opacity:.12;font-weight:700;min-width:7px}.screen-meta #memory-indicator.active{opacity:1}.screen-meta #expression{flex:1;text-align:right;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}#error-indicator{font-size:9px;color:#ed9273}#display{font:49px/1.15 var(--mono);font-variant-numeric:tabular-nums;letter-spacing:-2px;text-align:right;color:#ffc576;text-shadow:0 0 12px #f6a84b38;display:block;flex:1;white-space:nowrap}#display.medium{font-size:37px;letter-spacing:-1.5px}#display.small{font-size:28px;letter-spacing:-1px}.screen-bottom{display:flex;justify-content:space-between;font:6px var(--mono);letter-spacing:1.4px;opacity:.36;padding-top:4px}.utility-row{display:flex;justify-content:space-between;align-items:center;padding:11px 3px 12px}.model-label{font:6px var(--mono);letter-spacing:1.3px;color:#77806c}.power-button{background:linear-gradient(#c5caba,#b8bfac);color:#515d47;border:1px solid #9ca68e;border-radius:15px;display:flex;align-items:center;gap:6px;padding:4px 8px;box-shadow:0 1px 0 #e4e8d9;font:7px var(--mono)}.power-button svg{width:12px;height:12px}.power-led{width:4px;height:4px;background:#ac633b;box-shadow:0 0 5px #ce9652;border-radius:50%}.calculator.off .power-led{background:#7e8475;box-shadow:none}.calculator.off .screen>*{visibility:hidden}
.keypad{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));grid-template-rows:34px repeat(5,47px);gap:10px 9px;padding:1px 2px 7px}.key{border:0;border-top:1px solid #64685f;border-radius:7px;background:linear-gradient(145deg,#4d5249,#3e443a);color:#f1f0df;box-shadow:0 3px 0 #292f26,0 5px 3px #53604770,inset 1px 1px 1px #777b7155;font:20px var(--sans);position:relative;transition:background .12s,transform .08s,box-shadow .08s;touch-action:manipulation;user-select:none}.key:hover{background:linear-gradient(145deg,#606557,#4b5343)}.key:active,.key.pressed{transform:translateY(3px);box-shadow:0 0 0 #292f26,0 2px 2px #53604760,inset 1px 1px 1px #777b7155}.key.memory-key{font:10px var(--mono);background:linear-gradient(145deg,#777c6a,#646c5a);border-top-color:#8b917c;box-shadow:0 2px 0 #4f5945,0 4px 2px #53604755}.key.function-key{font-size:14px;background:linear-gradient(145deg,#68705e,#565e4d);border-top-color:#7a826d}.key.clear-key{background:linear-gradient(145deg,#a66b4b,#90563a);border-top-color:#bf8b66;color:#fff5dd;font-size:17px;box-shadow:0 3px 0 #6d412a,0 5px 3px #53604770}.key.operator-key{background:linear-gradient(145deg,#7b816b,#6b735d);border-top-color:#939981;font-size:24px;color:#f6f4dd}.key.equals-key{background:linear-gradient(145deg,#c47b46,#ad663b);border-top-color:#e0a36d;font-size:27px;color:#fff4dd;box-shadow:0 3px 0 #854a29,0 5px 3px #53604770}.key.operator-key.selected{outline:1px solid #efbf7e;outline-offset:-4px}.key.tall-key[data-key='+']{grid-column:5;grid-row:4/6}.key.tall-key[data-key='=']{grid-column:4/6;grid-row:6}.key.zero-key{grid-column:1/3}.machine-foot{display:flex;justify-content:space-between;padding:12px 5px 0;color:#737e67;font:6px var(--mono);letter-spacing:1.7px}.machine-foot span:last-child{font-size:4px;letter-spacing:3px}.under-device{max-width:425px;margin:25px auto 0;display:flex;justify-content:space-between;align-items:center;color:#777e70;font-size:9px;gap:10px}.under-device>span{display:flex;gap:6px;align-items:center}.tiny-key{display:inline-flex;align-items:center;justify-content:center;border:1px solid #c5c8ba;padding:0 4px;border-radius:3px;font:9px var(--mono);color:#7e8575}.quiet-button{background:transparent;border:0;padding:3px 0;color:#6c7563;font-size:10px;white-space:nowrap}.quiet-button:hover{color:var(--accent)}.feedback{max-width:425px;margin:5px auto 0;min-height:19px;color:#a3563d;font-size:10px;text-align:center}
.tape{background:#faf8f1;filter:drop-shadow(2px 8px 7px #625e5011);position:relative;margin-top:25px;padding:22px 22px 25px;min-height:510px;display:flex;flex-direction:column}.tape:before{content:'';position:absolute;inset:-5px 0 auto;height:9px;background:linear-gradient(135deg,transparent 5px,#faf8f1 0) 0 0/10px 10px repeat-x}.tape:after{content:'';position:absolute;inset:auto 0 -7px;height:9px;background:linear-gradient(45deg,transparent 5px,#faf8f1 0) 0 0/10px 10px repeat-x;transform:rotate(180deg)}.tape-top{display:flex;justify-content:space-between;align-items:center}.tape-heading{display:flex;gap:9px;align-items:center}.tape-heading svg{width:19px;height:19px;color:#7e8675}.tape h2{font-size:15px;font-weight:500;letter-spacing:-.3px;margin:0}.icon-button{background:none;border:none;color:#828779;display:grid;place-content:center;min-height:28px;min-width:28px;padding:3px;font-size:24px}.icon-button:hover:enabled{color:var(--accent)}.icon-button svg{width:16px;height:16px}.tape-date{display:flex;justify-content:space-between;padding:18px 0 12px;border-bottom:1px dashed #d1d3c4;color:#8d9285;font:7px var(--mono);letter-spacing:1.1px}.history{max-height:342px;overflow:auto;scrollbar-width:thin;scrollbar-color:#c5caba transparent;flex:1}.empty-tape{text-align:center;padding:69px 5px 45px;color:#969b8d}.empty-symbol{display:block;font:43px/1 Georgia,serif;margin-bottom:20px;color:#b1b7a6}.empty-tape h3{font-size:12px;font-weight:500;margin:0 0 8px;color:#7d8573}.empty-tape p{font-size:10px;line-height:1.8;margin:0}.empty-dashes{display:block;font:8px var(--mono);letter-spacing:5px;margin-top:30px;color:#b2b8a8}.history-row{border-bottom:1px dashed #e2e3d7;padding:13px 0 11px;display:flex;flex-direction:column;align-items:flex-end;gap:5px}.history-expression{font:10px/1.4 var(--mono);color:#8a917f;overflow-wrap:anywhere;max-width:100%}.history-result{font:21px/1.3 var(--mono);color:#49563d;background:none;border:0;padding:0 0 0 10px;text-align:right;overflow-wrap:anywhere;max-width:100%}.history-result:hover{color:#b16c43}.tape-bottom{border-top:1px dashed #d1d3c4;padding:14px 0 0;display:flex;gap:7px;align-items:flex-start;margin-top:18px;color:#9a9f91}.tape-bottom p{font-size:8px;line-height:1.7;margin:0}.privacy-dot{width:4px;height:4px;border-radius:50%;background:#9ba88a;margin-top:5px;flex-shrink:0}.desk-bottom{display:flex;align-items:center;gap:8px;font-size:9px;color:#8c9185;border-top:1px solid var(--line);padding:17px 0;margin-top:26px}.live-dot{width:5px;height:5px;border-radius:50%;background:#929e7f}.bottom-rule{flex:1}.desk-bottom>span:last-child{font:7px var(--mono);letter-spacing:1px}footer{text-align:center;color:#91958b;font-size:10px;padding:16px 20px 26px}footer a{text-decoration:none;border-bottom:1px solid #b7bbae;margin-left:2px;color:#6b7363}footer a:hover{color:var(--accent)}.heart{font-size:9px;color:#bd8d7f;margin:0 2px}
dialog{border:1px solid #d7dbcd;border-radius:15px;background:#f6f4ec;color:var(--ink);max-width:570px;width:calc(100% - 36px);padding:30px;box-shadow:0 25px 100px #252b3540}dialog::backdrop{background:#23291e80;backdrop-filter:blur(5px)}.dialog-heading{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}.dialog-heading h2{font:27px/1.2 Georgia,serif;margin:0 0 15px}.dialog-heading .eyebrow{margin-bottom:8px}dialog p{font-size:12px;line-height:1.8;color:#737b69}.shortcuts{display:grid;grid-template-columns:1fr 1.6fr;gap:10px 18px;font-size:11px;margin:24px 0}.shortcuts dt{font-family:var(--mono);color:#8c5839}.shortcuts dd{margin:0;color:#6c7562}.help-note{border-top:1px dashed #ccd2bf;padding-top:15px}.dialog-done{border:0;border-radius:6px;background:#555f49;color:#fffef1;padding:11px 15px;font-size:11px;margin-top:12px;width:100%;display:flex;justify-content:space-between}
@media(min-width:1500px){main{padding-top:55px}.intro{margin-bottom:42px}.workspace{gap:75px}.calculator{max-width:435px}.device-space{padding:24px 20px 0}.tape{min-height:525px}.desk-bottom{margin-top:40px}}
@media(max-width:850px){.page-header{padding:22px 25px}main{padding:30px 25px 0}.intro-note{display:none}.workspace{gap:25px;grid-template-columns:minmax(0,1fr) 270px}.device-space{padding:20px 0 0}.desk-label{display:none}.calculator{padding:23px 18px 14px}.keypad{gap:10px 8px}.tape{padding:20px 18px}.under-device{font-size:8px}h1{font-size:35px}}
@media(max-width:690px){.page-header{padding:19px 20px}.wordmark{font-size:21px}.edition{font-size:8px;padding-left:12px;margin-left:3px}.header-actions{gap:18px}.header-actions .text-button>span:not(.help-icon):not(.status-dot){display:none}main{padding:26px 20px 0;max-width:470px}.intro{margin-bottom:16px}.eyebrow{font-size:7px;letter-spacing:1.2px;margin-bottom:10px}h1{font-size:30px;line-height:1.1}h1 br{display:none}h1 em{display:block}.workspace{display:flex;flex-direction:column;gap:18px}.device-space{width:100%;padding:18px 4px 0}.calculator{padding:22px 19px 13px;border-radius:19px 19px 25px 25px}.keypad{grid-template-rows:32px repeat(5,45px);gap:10px 8px}.screen{height:105px}.under-device{font-size:8px;margin-top:23px;gap:5px}.quiet-button{font-size:9px}.tape{width:100%;min-height:290px;margin-top:0}.empty-tape{padding:28px 5px 18px}.empty-symbol{font-size:30px;margin-bottom:10px}.empty-dashes{margin-top:15px}.tape-bottom p{font-size:9px}.history{max-height:300px}.desk-bottom{margin-top:27px;font-size:8px}.desk-bottom>span:last-child{font-size:6px}footer{font-size:9px;padding-bottom:22px}.shortcuts{gap:9px 12px;font-size:10px}dialog{padding:23px}.dialog-heading h2{font-size:24px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;scroll-behavior:auto!important}}
@media(min-width:691px) and (max-height:850px){.page-header{padding-top:17px;padding-bottom:17px}main{padding-top:24px}.intro{margin-bottom:15px}h1{font-size:30px}h1 br{display:none}h1 em{margin-left:9px}.intro-note{font-size:11px}.device-space{padding-top:15px}.calculator{padding-top:20px;padding-bottom:12px}.machine-top{padding-bottom:11px}.machine-brand{font-size:22px}.machine-brand span{font-size:6px}.screen{height:90px}#display{font-size:42px}.screen-bezel{padding:9px 10px 10px}.utility-row{padding-top:8px;padding-bottom:9px}.keypad{grid-template-rows:28px repeat(5,38px);gap:9px 8px}.tape{margin-top:16px;min-height:455px}.empty-tape{padding-top:50px}.under-device{margin-top:20px}.desk-bottom{margin-top:15px}}
.site-nav{display:flex;gap:23px;align-items:center;margin-left:auto;margin-right:30px}.site-nav a{font-size:12px;text-decoration:none;color:#65705c}.site-nav a:hover{color:var(--accent)}.menu-toggle{display:none}.intro{gap:20px;align-items:flex-end}.intro-description{font-size:12px;color:#737e68;margin:12px 0 0;line-height:1.7}.result-actions{display:flex;gap:15px;justify-content:flex-end;align-items:center;flex-wrap:wrap;margin-bottom:4px}.result-actions .quiet-button{font-size:11px;padding:7px 0}.result-actions .quiet-button span{margin-left:2px}.mini-function{font:12px var(--mono);border:1px solid #9ca68e;border-radius:4px;color:#505d44;background:#c4cab8;padding:2px 7px;margin-left:auto;margin-right:12px}.mini-function:hover{background:#d8dfcb}.under-device{justify-content:center}.history-kind{font:6px var(--mono);letter-spacing:1px;color:#98a08b;align-self:flex-start}.pending-row{background:#eef0e43d;border-left:2px solid #ba8759;padding-left:9px;padding-right:5px}.pending-row .history-kind{color:#a3784d}.history-row{position:relative}.tape-bottom p{font-size:9px}.empty-tape p{font-size:11px}.history-expression{font-size:11px}.history-result{font-size:22px}.print-report{display:none}
.guide-section,.examples-section{scroll-margin-top:24px;margin-top:36px}.guide-section{background:#f7f5ee;border:1px solid #d5dacb;border-radius:12px;padding:24px 27px}.guide-section summary{list-style:none;display:flex;gap:20px;align-items:center;justify-content:space-between;cursor:pointer}.guide-section summary::-webkit-details-marker{display:none}.guide-section summary .eyebrow{display:block;margin-bottom:7px}.guide-section h2,.examples-section>h2{font:26px/1.25 Georgia,serif;font-weight:400;margin:0}.details-plus{font:28px var(--mono);color:#879478}#guide-details[open] .details-plus{transform:rotate(45deg)}.guide-content{border-top:1px dashed #d3d9c8;margin-top:22px;padding-top:12px}.guide-content p{font-size:13px;line-height:1.9;color:#626e57}.guide-content h3{font-size:15px;font-weight:600;margin-top:25px}.guide-columns{display:grid;grid-template-columns:1fr 1fr;gap:35px}.instruction-list{font-size:12px;line-height:1.9;color:#69755e;padding-left:18px}.instruction-list li{margin-bottom:9px}.instruction-list strong{color:#48553d}.table-scroll{overflow-x:auto}.shortcut-table{width:100%;border-collapse:collapse;font-size:11px}.shortcut-table th{text-align:left;color:#536046;font-weight:600;padding:9px 5px;border-bottom:1px solid #cfd7c2}.shortcut-table td{padding:8px 5px;border-bottom:1px solid #e1e5d8;color:#6a765e}.shortcut-table td:last-child{white-space:nowrap}kbd{font:10px var(--mono);background:#ecefe4;border:1px solid #d0d8c2;border-bottom-width:2px;border-radius:3px;padding:2px 4px;display:inline-block;color:#566448}.examples-section{padding:18px 0 0}.example-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:27px;margin:25px 0 36px}.example-grid article{border-top:1px solid #ccd3c0;padding-top:16px}.example-number{font:9px var(--mono);color:#a2aa96}.example-grid h3{font-size:15px;font-weight:500;margin:10px 0}.example-grid p{font-size:12px;color:#6f7a62;line-height:1.9;margin:0}.faq{border-top:1px solid #ccd3c0;padding-top:25px}.faq h2{font:24px Georgia,serif;margin:0 0 18px}.faq details{border-bottom:1px solid #d9dfd0;padding:14px 0}.faq summary{font-size:13px;color:#5b694d;cursor:pointer}.faq p{font-size:12px;line-height:1.9;color:#768268;max-width:750px}.guide-section .help-note{margin-top:23px;font-size:12px}footer{padding-top:30px}.site-nav a,.text-button,.result-actions button{min-height:32px}.result-actions button:disabled{opacity:.5}
@media(max-width:850px){.site-nav{gap:14px;margin-right:18px}.site-nav a{font-size:11px}.intro{align-items:flex-start;flex-direction:column;gap:8px}.result-actions{margin-top:0}.guide-columns{gap:22px}.guide-section{padding:22px}.example-grid{gap:20px}}
@media(max-width:690px){.page-header{flex-wrap:wrap;gap:15px}.menu-toggle{display:flex;margin-left:auto}.header-actions{gap:0}.site-nav{display:none;order:4;width:100%;margin:0;border-top:1px solid #d2d8c7;padding-top:10px}.menu-open .site-nav{display:flex;justify-content:space-between}.site-nav a{font-size:12px}.intro-description{font-size:12px;margin-top:10px}.result-actions{width:100%;justify-content:space-between;gap:10px}.result-actions .quiet-button{font-size:11px}.mini-function{margin-right:9px}.guide-section{margin-top:28px;padding:20px}.guide-section h2{font-size:22px}.guide-columns{grid-template-columns:1fr;gap:0}.guide-content p{font-size:12px}.instruction-list{font-size:12px}.example-grid{grid-template-columns:1fr;gap:24px}.examples-section>h2{font-size:24px}.tape-bottom p{font-size:10px}.history-kind{font-size:7px}.history-expression{font-size:12px}}
@media print{@page{size:A4;margin:17mm}body{background:#fff;color:#222;font:11pt/1.5 Arial,sans-serif;min-width:0}.page-header,main,body>footer,.skip{display:none!important}.print-report{display:block}.print-report h2{font:25pt Georgia,serif;color:#37402e;margin:0 0 8mm}.print-report p{font-size:10pt}.print-report table{width:100%;border-collapse:collapse;margin-top:9mm;font-size:10pt}.print-report th,.print-report td{padding:3mm 2mm;border-bottom:1px solid #ddd;text-align:left}.print-report th{background:#eee}.print-report td:nth-child(3){text-align:right}.print-report tr{break-inside:avoid}.print-report thead{display:table-header-group}.print-attribution{margin-top:12mm!important;font-size:8pt!important;color:#777}a:after{content:none!important}}