:root{color-scheme:light;--page:#f5f6f2;--surface:#fff;--header:#fafbf8;--input:#fcfdfa;--blocks:#fafcf8;--result:#fcfdf9;--hover:#edf3ee;--chip:#eaf0e8;--badge:#edf1e7;--ink:#233d36;--button:#28473d;--brand:#183e32;--input-ink:#253e33;--muted:#738377;--border:#dce3da;--accent:#244e3e;--accent-hover:#183b2d;--error:#a33324;--focus:#a78c45;--cursor:#327057;--on-accent:#fff}:root[data-theme=dark]{color-scheme:dark;--page:#181818;--surface:#222222;--header:#1c1c1c;--input:#1c1c1c;--blocks:#1c1c1c;--result:#202020;--hover:#303030;--chip:#303030;--badge:#303030;--ink:#e0e0e0;--button:#d6d6d6;--brand:#e0e0e0;--input-ink:#e0e0e0;--muted:#ababab;--border:#404040;--accent:#d0d0d0;--accent-hover:#e6e6e6;--error:#ffac9e;--focus:#e0e0e0;--cursor:#d0d0d0;--on-accent:#181818}:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--ink);background:var(--page);font-synthesis:none;font-size:14px}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button{cursor:pointer;border:1px solid var(--border);border-radius:7px;background:var(--surface);color:var(--button);padding:11px 15px;transition:background .15s}button:hover{background:var(--hover)}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--focus);outline-offset:3px}[hidden]{display:none!important}header{height:84px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 max(5vw,24px);background:var(--header)}.brand{display:flex;align-items:center;gap:6px;text-decoration:none;color:var(--brand);font-size:20px;font-weight:700;letter-spacing:-.7px}.brand>span:last-child{font-weight:400}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:#224c3e;color:#fff;font-size:25px;margin-right:7px}.local{font-size:12px;color:var(--muted)}main{max-width:1220px;margin:auto;padding:50px 28px 20px}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;color:var(--muted)}.intro h1{font-size:clamp(30px,4vw,44px);letter-spacing:-1.8px;font-weight:600;margin:13px 0}.intro p{color:var(--muted);margin:0;font-size:15px}.workspace{display:grid;grid-template-columns:1.3fr 1fr;gap:24px;margin-top:36px}.card{background:var(--surface);border:1px solid var(--border);border-radius:13px;padding:26px;box-shadow:0 4px 14px #233d3603}.card-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:25px}h2{font-size:16px;font-weight:600;margin:0}.number{font-size:11px;color:var(--muted);margin-right:12px;font-weight:400}.subtle{border:0;background:transparent;color:var(--muted);padding:7px}.card-heading .subtle{font-size:12px}label{display:block;font-size:12px;color:var(--muted);margin-bottom:9px}form{display:flex;gap:8px}input,textarea{border:1px solid var(--border);border-radius:7px;padding:12px;background:var(--input);color:var(--input-ink);min-width:0}input{flex:1}textarea{width:100%;resize:vertical;line-height:1.7;font-family:ui-monospace,monospace}form button{font-size:12px}form button span:not([data-i18n]){margin-left:15px;color:var(--muted)}.blocks{min-height:106px;border:1px solid var(--border);border-radius:7px;background:var(--blocks);padding:15px 10px;margin-top:15px;display:flex;align-content:center;align-items:center;flex-wrap:wrap;gap:3px}.block{padding:6px 8px;background:var(--chip);border-color:var(--border);font-family:ui-monospace,monospace;font-size:14px;max-width:100%;overflow-wrap:anywhere}.slot{padding:3px 0;width:8px;border:0;background:transparent;color:transparent}.slot.selected{color:var(--cursor)}.hint{font-size:11px;line-height:1.6;color:var(--muted)}.keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:19px 0}.keypad button{font-size:11px;padding:11px 6px;text-align:left}.keypad small{float:right;color:var(--muted)}.preview{border-top:1px solid var(--border);padding-top:19px;margin-top:21px;overflow-wrap:anywhere}.preview #plain{font-family:ui-monospace,monospace;font-size:12px;color:var(--muted);margin:13px 0 7px}.algebra{font-family:Georgia,serif;font-size:23px;line-height:1.6;overflow-wrap:anywhere}.actions{display:flex;align-items:center;gap:15px;margin-top:21px}.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.primary:hover{background:var(--accent-hover)}.actions .primary{flex:1;text-align:left;padding:14px 17px}.primary span:not([data-i18n]){float:right}.secondary-actions{display:flex;gap:10px;margin-top:11px}.secondary-actions button{flex:1;font-size:12px}.error{font-size:12px;color:var(--error);margin-top:12px;overflow-wrap:anywhere}.error:empty{display:none}.result-card{display:flex;flex-direction:column;background:var(--result)}.badge{font-size:8px;letter-spacing:1px;background:var(--badge);color:var(--muted);border-radius:4px;padding:6px 7px}.result-card .card-heading{flex-wrap:wrap}#empty-result{flex:1;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px}.empty-symbol{font-family:Georgia,serif;font-size:58px;color:var(--muted);line-height:1;margin-bottom:20px}h3{font-size:17px;font-weight:500;margin:12px 0}#empty-result p{font-size:13px;line-height:1.8;color:var(--muted);max-width:255px;margin-top:0}#result{flex:1;padding:35px 0;overflow-wrap:anywhere}#result-plain{font-family:ui-monospace,monospace;font-size:20px;line-height:1.6;margin:16px 0}#result-algebra{font-size:30px;margin:12px 0}.copy{font-size:11px;padding:6px 10px;background:transparent}.result-divider{border-top:1px solid var(--border);margin:28px 0}#simplified-circuit{width:100%;text-align:left}#simplified-circuit span:not([data-i18n]){float:right}.result-card>.hint{text-align:center;margin-bottom:0}.examples{display:flex;align-items:center;gap:12px;margin:24px 0 34px;flex-wrap:wrap}.examples>.eyebrow{margin-right:auto}.examples button{font-size:11px;background:transparent;padding:10px 13px}.examples button span:not([data-i18n]){margin-left:15px;color:var(--muted)}footer{border-top:1px solid var(--border);padding:23px 0;display:flex;justify-content:space-between;gap:18px;font-size:10px;color:var(--muted)}footer>span:first-child{font-weight:600}#steps-section{margin-bottom:30px}#steps{padding:0;list-style:none;display:grid;gap:10px}#steps button{width:100%;text-align:left;display:grid;gap:9px;padding:18px}#steps strong{font-size:12px}#steps span{font:22px Georgia,serif;overflow-wrap:anywhere}#steps small{color:var(--muted);overflow-wrap:anywhere}dialog{width:min(1050px,94vw);max-height:90vh;border:1px solid var(--border);border-radius:14px;padding:25px;color:var(--ink)}dialog::backdrop{background:#102b24aa;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}dialog h2{margin-top:8px}#diagram-expression{font:20px Georgia,serif;overflow-wrap:anywhere}#diagram-scroll{overflow:auto;max-height:55vh;border:1px solid var(--border);border-radius:8px;background:#fff}#diagram-scroll svg{display:block;margin:auto;max-width:none}.diagram-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:20px}.toast:not(:empty){position:fixed;bottom:25px;left:50%;transform:translate(-50%);background:var(--accent);color:#fff;padding:12px 22px;border-radius:8px}@media(max-width:760px){header{height:68px;padding:0 20px}.local{font-size:10px}.brand{font-size:17px}main{padding:32px 16px 14px}.workspace{grid-template-columns:1fr;gap:16px;margin-top:27px}.card{padding:20px}.intro h1{letter-spacing:-1px}.keypad{gap:6px}.keypad button{font-size:10px}#empty-result{min-height:210px}.examples{gap:8px}.examples>.eyebrow{width:100%;margin-bottom:4px}footer{flex-direction:column;gap:8px}.badge{font-size:7px}dialog{padding:18px}.diagram-bottom{flex-wrap:wrap}}.primary,.toast:not(:empty){color:var(--on-accent)}dialog{background:var(--surface)}input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}.header-actions{display:flex;align-items:center;gap:20px}#theme-toggle{font-size:12px;white-space:nowrap}:root[data-theme=dark] #diagram-scroll{background:#202020}:root[data-theme=dark] #diagram-scroll svg{filter:invert(1) hue-rotate(180deg)}@media(max-width:760px){.header-actions{gap:8px}.local{display:none}#theme-toggle{padding:9px 11px}}:root[data-theme=dark] .brand-mark{background:var(--chip);color:var(--ink)}:root[data-theme=dark] .card{box-shadow:0 4px 14px #00000018}:root[data-theme=dark] dialog::backdrop{background:#000a}#language{font:inherit;font-size:12px;padding:10px;border:1px solid var(--border);border-radius:7px;background:var(--surface);color:var(--button);max-width:140px}#language:focus-visible{outline:3px solid var(--focus);outline-offset:3px}@media(max-width:1000px){.local{display:none}}@media(max-width:600px){header{height:auto;min-height:68px;flex-wrap:wrap;gap:12px;padding:15px 20px}.header-actions{flex-wrap:wrap}.keypad{grid-template-columns:repeat(2,minmax(0,1fr))}.card-heading h2{line-height:1.5}.actions .primary{min-width:0}}.feature-menu-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}.feature-menu-heading h1{font-size:24px;font-weight:600;margin:0}.feature-link{display:flex;align-items:center;gap:26px;text-decoration:none;color:var(--ink);padding:32px;transition:background .15s,border-color .15s}.feature-link:hover{background:var(--hover);border-color:var(--muted)}.feature-icon{display:grid;place-items:center;flex-shrink:0;width:72px;height:72px;border:1px solid var(--border);border-radius:16px;background:var(--chip);font:40px Georgia,serif}.feature-content{flex:1;min-width:0}.feature-content h3{font-size:26px;font-weight:600;margin:10px 0}.feature-content p{color:var(--muted);line-height:1.8;max-width:660px;margin:0}.feature-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:19px}.feature-tags span{font-size:11px;background:var(--chip);color:var(--button);padding:6px 10px;border-radius:5px}.feature-arrow{font-size:28px;color:var(--muted)}.future-note{display:flex;gap:12px;align-items:center;margin:26px 0 55px;font-size:12px;color:var(--muted)}.future-note>span:first-child{font-size:20px}.back-link{display:inline-flex;gap:8px;color:var(--muted);text-decoration:none;margin-bottom:28px;font-size:12px}.back-link:hover{color:var(--ink)}#landing-title:focus,#workbench-title:focus{outline:none}@media(max-width:760px){.feature-menu-heading{align-items:flex-start;flex-direction:column;gap:5px}.feature-link{padding:22px;gap:16px;align-items:flex-start;flex-wrap:wrap}.feature-icon{width:46px;height:46px;font-size:28px}.feature-content{flex-basis:calc(100% - 62px)}.feature-content h3{font-size:22px}.feature-arrow{display:none}.future-note{line-height:1.7;margin-bottom:35px}}