@charset "UTF-8";
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:root[data-theme=dark]{--bg:#111e19;--surface:#1b2b23;--ink:#e7eee3;--text:#d0ddcf;--muted:#a5b3a6;--line:#35483b;--green:#a7d1a7;--green-dark:#9ec49a;--mint:#293f30;--peach:#44372e;--lavender:#343442;--subtle:#22332a;--display:#0d1c15;--display-ink:#e4f5d5;--shadow:none;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 "Segoe UI",Arial,sans-serif;-webkit-font-smoothing:antialiased}button,input,textarea{font:inherit}button,a,input,textarea,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button{color:inherit}a{color:inherit;text-decoration:none}button:disabled{cursor:not-allowed;opacity:.45}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--green);outline-offset:4px}input:focus,textarea:focus{outline:2px solid var(--green);outline-offset:2px}button{transition:background .16s,border-color .16s,transform .16s}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{color:var(--ink)}h1,h2{font-weight:600;letter-spacing:-1.8px;line-height:1.12}h2{font-size:34px}h3{font-size:18px;font-weight:600;letter-spacing:-.3px}h4{font-size:17px;line-height:1.4}em{font-family:Georgia,"Times New Roman",serif;font-weight:400}button 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22px;display:flex;flex-direction:column}.notebook-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:17px}.notebook-header h3{font-size:14px}.notebook-header>span{color:var(--muted);font-size:19px}.notebook-tabs{display:flex;gap:19px;border-bottom:1px solid var(--line)}.notebook-tabs button{border:0;background:transparent;padding:0 0 10px;font-size:10px;color:var(--muted);border-bottom:2px solid transparent}.notebook-tabs .selected{color:var(--green);border-color:var(--green);font-weight:650}.notebook-tabs button span{display:inline-block;margin-left:3px;padding:0 5px;background:var(--subtle);border-radius:4px;font-size:8px}.notebook-illustration{margin:28px auto 19px;width:180px;height:110px;position:relative;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:18px 18px;opacity:.85}.notebook-illustration>span{position:absolute;top:2px;left:51px;font:italic 26px 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0}.workspace-footnote{margin-top:16px;text-align:center;font-size:9px;color:var(--muted)}.workspace-footnote a{color:var(--green);margin-left:7px;text-decoration:underline;text-underline-offset:3px}.section-space{margin-top:91px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:30px}.section-heading .eyebrow{margin-bottom:12px}.section-heading>p{font-size:12px;color:var(--muted);line-height:1.8}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.tool-card{position:relative;text-align:left;padding:25px 26px 22px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.tool-card:hover{transform:translateY(-3px);border-color:var(--green)}.tool-symbol{display:grid;place-items:center;border-radius:11px;width:45px;height:45px;font:24px Georgia;color:var(--ink)}.mint{background:var(--mint)}.peach{background:var(--peach)}.lavender{background:var(--lavender)}.tool-arrow{position:absolute;right:25px;top:30px;color:var(--muted);font-size:19px}.tool-card h3{margin-top:21px;font-size:17px}.tool-card p{font-size:12px;color:var(--muted);line-height:1.9;margin-top:7px;max-width:30ch}.tool-meta{font-size:8px;letter-spacing:1.4px;color:var(--muted);display:block;margin-top:24px}.how-section{background:var(--mint);border:1px solid var(--line);border-radius:16px;padding:43px 48px;display:grid;grid-template-columns:1.1fr 1fr;gap:60px}.how-intro h2{font-size:33px;line-height:1.3;margin-top:15px}.how-intro>a{display:inline-flex;align-items:center;gap:30px;background:var(--surface);padding:9px 17px;font-size:11px;border-radius:6px;margin-top:26px;color:var(--green);border:1px solid var(--line)}.how-steps{list-style:none;padding:0;margin:0;display:grid;gap:24px}.how-steps li{display:flex;gap:19px}.how-steps li>span{font:italic 22px 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h3{font-size:18px;line-height:1.4;margin-top:10px}.learn-body p{font-size:12px;color:var(--muted);line-height:1.9;margin-top:12px}.learn-body button{display:flex;justify-content:space-between;width:100%;padding:18px 0 0;border:0;border-top:1px solid var(--line);background:transparent;color:var(--green);font-size:11px;margin-top:23px}.faq-section{display:grid;grid-template-columns:1fr 1.65fr;gap:90px;margin-bottom:90px}.faq-section h2{font-size:43px;line-height:1.2;margin-top:16px}.faq-section>div>p:last-child{color:var(--muted);font-size:12px;margin-top:19px;line-height:1.9}.faq-list details{border-bottom:1px solid var(--line)}.faq-list summary{list-style:none;display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:13px;font-weight:500;color:var(--ink);padding:20px 0;cursor:pointer}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary>span{font-size:18px;font-weight:400;color:var(--muted);transition:transform .16s}.faq-list details[open] summary>span{transform:rotate(45deg)}.faq-list details>p{font-size:12px;line-height:1.9;padding:0 25px 20px 0;color:var(--muted)}.site-footer{border-top:1px solid var(--line);background:var(--surface)}.footer-top{display:flex;align-items:center;gap:35px;padding-block:34px}.footer-top .brand{font-size:19px}.footer-top>p{color:var(--muted);font:italic 13px Georgia}.footer-top>a:last-child{margin-left:auto;font-size:11px;color:var(--green)}.footer-bottom{border-top:1px solid var(--line);padding-block:20px;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:9px}.footer-bottom>div{display:flex;gap:20px}.footer-bottom button{padding:0;background:transparent;border:0;font-size:9px}.footer-bottom a:hover,.footer-bottom button:hover{color:var(--green)}dialog{width:min(520px,calc(100% - 36px));max-height:calc(100dvh - 40px);border:1px solid var(--line);border-radius:18px;background:var(--surface);color:var(--text);padding:27px;box-shadow:0 25px 100px #0003}dialog::backdrop{background:#13281ec9;backdrop-filter:blur(5px)}.dialog-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:14px}dialog h2{font-size:29px;letter-spacing:-1px}.tool-formula{font:12px/1.8 Consolas,monospace;color:var(--muted);margin-top:12px}.tool-fields{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-block:23px}.tool-fields label{font-size:11px;color:var(--muted)}.tool-fields input{display:block;width:100%;padding:10px;border-radius:7px;border:1px solid var(--line);background:var(--bg);color:var(--ink);margin-top:6px;font-size:16px}.tool-result{background:var(--mint);border:1px solid var(--line);padding:18px;border-radius:8px;margin-top:15px;font:25px Consolas,monospace;overflow-wrap:anywhere;color:var(--ink)}.dialog-note{font-size:10px;color:var(--muted);margin-top:15px}#info-content{font-size:14px;line-height:1.9;margin-top:18px}.toast{position:fixed;z-index:100;bottom:25px;left:50%;transform:translateX(-50%);max-width:calc(100% - 30px);border:1px solid var(--line);border-radius:10px;background:var(--green-dark);color:var(--surface);padding:12px 22px;font-size:12px;box-shadow:0 8px 35px #0002}
@media(min-width:1450px){.hero{padding-top:66px;padding-bottom:53px}.workspace{grid-template-columns:300px 1fr 300px}.keypad button{height:52px}}
@media(max-width:1100px){.container,.header-inner{width:calc(100% - 48px)}.header-inner{gap:20px}#main-nav{gap:19px}.free-label{display:none}.hero{gap:30px}h1{font-size:52px}.hero-notes{gap:12px;font-size:9px}.hero-examples{padding-left:0}.workspace{grid-template-columns:250px 1fr}.notebook-panel{grid-column:1/-1;min-height:0}.notebook-tabs{max-width:300px}.notebook-illustration{float:left;margin:20px 35px 15px 0}#notes-empty{min-height:130px;padding-top:20px}#notes-empty h4{padding-top:12px}.tip{margin-top:12px}#notes-answer{padding-top:18px}#notes-steps{display:flex;gap:30px}#notes-steps li{flex:1}#history-list{display:grid;grid-template-columns:1fr 1fr;gap:0 25px}.tool-card{padding:22px}.learn-body{padding:20px}.how-section{gap:40px;padding:35px}.faq-section{gap:55px}}
@media(max-width:800px){#main-nav{gap:15px;font-size:11px}.brand{font-size:19px}.header-actions{gap:8px}.hero{gap:25px}h1{font-size:46px}.hero-notes{flex-wrap:wrap;gap:7px 15px}.equation{font-size:24px}.mini-equations button{padding:14px 12px}.mini-equations strong{font-size:15px}.hero-examples{padding-right:0}.hero-description{font-size:12px}.section-heading{align-items:start}.section-heading h2{font-size:29px}.section-heading>p{font-size:11px}.tool-grid{grid-template-columns:repeat(2,1fr)}.learn-grid{gap:12px}.learn-body h3{font-size:16px}.learn-body{padding:16px}.formula-art{height:155px;padding:20px}.formula-art>span:first-child{font-size:20px}.formula-art svg{width:85px;right:10px;bottom:20px}.formula-art>b{font-size:44px}.how-intro h2{font-size:28px}.footer-top{gap:20px}.footer-top>p{font-size:11px}.footer-top>a:last-child{font-size:10px}}
@media(max-width:680px){html{scroll-padding-top:85px}.container,.header-inner{width:calc(100% - 36px)}.site-header{height:66px}.header-inner{gap:10px}.brand{font-size:20px}.brand-mark{height:33px;width:33px}.menu-toggle{display:grid}#main-nav{display:none;position:absolute;left:0;top:65px;width:100%;padding:14px 22px;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:0 14px 18px #0000000a}#main-nav.open{display:flex;flex-direction:column;align-items:stretch;gap:0}#main-nav a{padding:12px;font-size:14px}#main-nav .current:after{display:none}.hero{grid-template-columns:1fr;padding-top:35px;padding-bottom:35px;gap:27px}.hero .eyebrow{font-size:8px;letter-spacing:1.2px}h1{font-size:49px;line-height:1.08;letter-spacing:-2px}.hero-description{font-size:12px;margin-top:14px}.hero-notes{margin-top:18px;font-size:9px;gap:10px}.hero-examples{padding:0;max-width:none}.hero-equation{padding:16px 21px}.equation{font-size:26px}.mini-equations button{min-height:88px;padding:15px 18px}.mini-equations strong{font-size:18px}.hero-footnote{font-size:11px}.example-heading{font-size:8px;margin-bottom:8px}.section-bar h2{font-size:14px}.section-bar{margin-bottom:12px}.workspace-status{font-size:8px}.section-bar>div{gap:8px}.workspace{grid-template-columns:1fr;gap:15px}.calculator-panel{grid-row:1;padding:16px 16px 0}.prompt-panel{grid-row:2;padding:22px}.notebook-panel{grid-row:3;grid-column:auto;padding:22px}.keypad button{height:53px}.calculator-toolbar{margin-bottom:14px}.display{min-height:143px}.panel-description br{display:none}.suggestions{margin-top:12px}.suggestions button{padding-block:11px;font-size:12px}.local-note{padding-top:20px}.notebook-illustration{float:none;margin:25px auto 20px}#notes-empty{padding-top:0}#notes-empty h4{padding-top:0}.tip{margin-top:22px}#notes-steps{display:block}#history-list{display:block}.workspace-footnote{font-size:9px;text-align:left;line-height:1.9;margin-top:13px}.workspace-footnote a{margin-left:0;display:block}.section-space{margin-top:55px}.section-heading{display:block;margin-bottom:22px}.section-heading h2{font-size:32px}.section-heading>p{margin-top:14px;font-size:12px}.section-heading .eyebrow{font-size:9px}.tool-grid{gap:12px}.tool-card{padding:18px 16px}.tool-symbol{height:38px;width:38px;font-size:22px}.tool-arrow{right:15px;top:20px;font-size:16px}.tool-card h3{font-size:15px;line-height:1.4;margin-top:16px}.tool-card p{font-size:11px;line-height:1.8}.tool-meta{font-size:7px;letter-spacing:.8px;margin-top:19px}.how-section{grid-template-columns:1fr;padding:26px;gap:32px}.how-intro h2{font-size:30px}.how-intro>a{margin-top:20px}.how-steps{gap:23px}.learn-grid{grid-template-columns:1fr;gap:18px}.formula-art{height:170px;padding:27px 32px}.formula-art>span:first-child{font-size:25px}.formula-art svg{width:120px;right:24px;bottom:25px}.learn-body{padding:24px}.learn-body h3{font-size:20px}.learn-body p{font-size:12px}.faq-section{grid-template-columns:1fr;gap:22px;margin-bottom:55px}.faq-section h2{font-size:37px}.faq-section>div>p:last-child{display:none}.faq-list summary{font-size:13px}.footer-top{flex-wrap:wrap;gap:17px;padding-block:26px}.footer-top .brand{font-size:20px}.footer-top>p{width:100%;order:3}.footer-top>a:last-child{font-size:10px;max-width:110px;text-align:right}.footer-bottom{flex-direction:column;gap:14px;font-size:9px}.footer-bottom>div{gap:18px;flex-wrap:wrap}.tool-fields{gap:15px}.tool-fields label{font-size:10px}.dialog-note{font-size:9px}dialog{padding:22px}.desktop-break{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}

.catalog-browse{display:flex;justify-content:center;margin-top:24px}.catalog-browse a{padding:14px 25px;border:1px solid var(--line);border-radius:8px;font-size:13px}.catalog-browse a:hover{background:var(--mint)}#tool-full-page{font-size:12px;text-decoration:underline;text-underline-offset:4px}

.footer-content-links{display:flex;flex-wrap:wrap;gap:14px 25px;font-size:12px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.footer-content-links a:hover{text-decoration:underline}

.guided-workspace{display:grid;gap:12px;font-size:12px;overflow-wrap:anywhere}.guided-workspace h3{font-size:16px}.guided-workspace p{font-size:11px;color:var(--muted);line-height:1.7}.guided-workspace form{display:grid;gap:12px}.guided-workspace label{display:grid;gap:5px}.guided-workspace input,.guided-workspace select{width:100%;min-width:0;padding:9px;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--ink);font-size:14px}.guided-workspace a{text-decoration:underline;text-underline-offset:3px}.guided-workspace+button{margin-top:12px}#live-preview{font-size:10px;color:var(--muted);min-height:15px}.guided-workspace [hidden]{display:none}

.history-item small{font-size:9px;color:var(--muted)}
.text-button{background:transparent;border:0;color:var(--green);font-size:12px;text-decoration:underline;text-underline-offset:4px;padding:0;cursor:pointer}

.guided-workspace .secondary-button{padding:10px 12px;text-align:left;background:var(--surface);color:var(--green);border:1px solid var(--line);border-radius:7px;font-size:12px}