:root{--bg:#10161e;--panel:#151e29;--editor:#0c121a;--line:#334150;--text:#e5eaf0;--muted:#a7b5c5;--accent:#f4bd63;--danger:#ffc2b8;color-scheme:dark;font:15px/1.5 'Helvetica Neue',Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit;color:inherit}button,select,input:not([type=checkbox]):not([type=file]),.file-button{min-height:44px;border:1px solid #536173;border-radius:3px;background:#1d2936;padding:9px 13px;max-width:100%}button,.file-button,summary{cursor:pointer}button:hover:not(:disabled),.file-button:hover{border-color:var(--accent);background:#293543}button:disabled{opacity:.42;cursor:not-allowed}button.primary{background:var(--accent);color:#18202a;border-color:var(--accent);font-weight:700}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,a:focus-visible,.file-button:focus-within{outline:3px solid var(--accent);outline-offset:3px}header{padding:25px 32px 20px;display:flex;justify-content:space-between;gap:20px;align-items:center;border-bottom:1px solid var(--line)}.wordmark{display:flex;align-items:center;gap:18px}.mark{font:26px 'SFMono-Regular',Consolas,monospace;color:var(--accent)}h1{font-size:20px;letter-spacing:.15em;margin:0}header p{margin:3px 0 0;color:var(--muted);font-size:13px}.environment{font:11px/1.7 'SFMono-Regular',Consolas,monospace;letter-spacing:.08em;color:var(--accent)}.environment span{display:block;color:var(--muted);letter-spacing:0}.safety{padding:12px 32px;background:#1d2530;border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}.safety strong{color:var(--text)}main{max-width:1720px;margin:auto;padding:0 32px}.lessonbar{display:flex;align-items:center;gap:12px;padding:20px 0}.lessonbar>label{font-size:11px;color:var(--muted);letter-spacing:.12em}.lessonbar select{min-width:265px}.lessonbar>span{font-size:12px;color:var(--muted)}.toolbar{display:flex;align-items:center;gap:8px;padding:14px 0;border-top:1px solid var(--line)}.clock{display:grid;grid-template-columns:auto auto;column-gap:18px;margin-left:auto;font:13px 'SFMono-Regular',Consolas,monospace}.clock strong{font-size:20px;color:var(--accent);font-weight:500}.clock>span{align-self:center;color:var(--muted)}.clock small{grid-column:1/-1;font:11px/1.6 'Helvetica Neue',Arial,sans-serif;color:var(--muted)}.statusbar{background:#202a36;display:flex;justify-content:space-between;gap:12px;padding:8px 12px;font-size:12px;border:1px solid var(--line)}#status{font-weight:600;color:var(--accent)}#state-note{color:var(--muted)}.error{margin:0;padding:12px;border:1px solid var(--danger);color:var(--danger);background:#2c2226;white-space:pre-wrap;overflow-wrap:anywhere}.workbench{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(340px,1fr);border:1px solid var(--line);border-top:0;align-items:start}.editor-pane,.monitor-pane{min-width:0}.editor-pane{border-right:1px solid var(--line);background:var(--editor)}.pane-title{height:47px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line);gap:12px;background:var(--panel)}h2{font-size:11px;letter-spacing:.1em;margin:0;font-weight:600}.pane-title>span{font:11px 'SFMono-Regular',Consolas,monospace;color:var(--muted)}.editor{display:grid;grid-template-columns:48px minmax(0,1fr);height:365px}.editor pre{margin:0;padding:18px 10px 18px 0;overflow:hidden;text-align:right;color:#76879b;font:14px/1.7 'SFMono-Regular',Consolas,monospace;user-select:none;border-right:1px solid #202c3b}.editor textarea{min-width:0;width:100%;resize:none;border:0;border-radius:0;background:transparent;color:#e4d9c3;padding:18px 16px;white-space:pre;tab-size:4;outline-offset:-3px;font:14px/1.7 'SFMono-Regular',Consolas,monospace}.editor-footer{display:flex;justify-content:space-between;gap:12px;padding:9px 16px;border-top:1px solid #202c3b;font:10px/1.5 'SFMono-Regular',Consolas,monospace;color:var(--muted)}.instructions{padding:20px 22px;background:var(--panel);border-top:1px solid var(--line);font-size:13px}.instructions h3{font-size:16px;margin:0 0 8px}.instructions p{color:var(--muted);margin:0 0 14px}.instructions ol{margin:0;padding-left:22px}.instructions li{padding:0 0 10px 5px}.instructions li::marker{color:var(--accent)}.monitor-pane{background:var(--panel);height:100%}.monitor-help{padding:13px 18px;color:var(--muted);font-size:12px;border-bottom:1px solid var(--line)}.io-group{padding-bottom:8px}.io-heading{margin:0;padding:14px 18px 7px;font-size:10px;color:var(--muted);letter-spacing:.13em}.io-row{padding:10px 18px;border-bottom:1px solid #273341;display:grid;grid-template-columns:minmax(0,1fr) minmax(100px,auto);gap:8px 14px;align-items:center}.signal-name{font:13px 'SFMono-Regular',Consolas,monospace;overflow-wrap:anywhere}.signal-meta{display:block;font:10px/1.8 'SFMono-Regular',Consolas,monospace;color:var(--muted)}.io-value{font:13px/1.6 'SFMono-Regular',Consolas,monospace;display:flex;gap:9px;align-items:center;justify-content:flex-end;overflow-wrap:anywhere}.led{height:9px;width:9px;display:inline-block;border-radius:50%;background:#536070;flex-shrink:0}.led.on{background:var(--accent);box-shadow:0 0 0 3px #f4bd6320}.input-control{display:flex;justify-content:flex-end;align-items:center;gap:8px;font:12px 'SFMono-Regular',Consolas,monospace}.input-control label{display:flex;align-items:center;gap:8px;min-height:44px;cursor:pointer}.input-control input[type=checkbox]{appearance:none;width:40px;height:25px;border-radius:20px;background:#26313e;border:1px solid #637286;position:relative;margin:0}.input-control input[type=checkbox]:before{content:'';width:15px;height:15px;position:absolute;top:4px;left:4px;border-radius:50%;background:#a7b5c5}.input-control input[type=checkbox]:checked{background:var(--accent);border-color:var(--accent)}.input-control input[type=checkbox]:checked:before{background:#1a232e;left:19px}.input-control input[type=number]{width:125px;padding:8px}.snapshot{grid-column:1/-1;text-align:right;font:10px 'SFMono-Regular',Consolas,monospace;color:var(--muted)}.address-note{font-size:11px;color:var(--muted);padding:10px 18px;margin:0}.symbols,.reference{border-bottom:1px solid var(--line);padding:0 0 18px}summary{min-height:55px;padding:16px 0;font-size:12px;letter-spacing:.05em}summary span{float:right;color:var(--muted);font-size:11px}.symbols>p{font-size:13px;color:var(--muted)}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;font:12px 'SFMono-Regular',Consolas,monospace}th,td{text-align:left;padding:10px;border-bottom:1px solid var(--line)}th{color:var(--muted);font-weight:400}td button{font:12px 'Helvetica Neue',Arial,sans-serif;margin-right:5px}#symbol-form{display:flex;flex-wrap:wrap;gap:12px;align-items:end;margin-top:20px}#symbol-form label{display:grid;gap:5px;font-size:12px;flex:1 1 140px}#symbol-form input{width:100%}.project-tools{display:flex;flex-wrap:wrap;gap:12px;align-items:center;padding:18px 0;border-bottom:1px solid var(--line)}.project-tools>span{font-size:12px;color:var(--muted)}.project-tools>p{width:100%;margin:0;font-size:13px}.file-button{position:relative;display:inline-flex;align-items:center;overflow:hidden}.file-button input{position:absolute;inset:0;width:100%;opacity:0;cursor:pointer}.reference-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;font-size:13px;color:var(--muted)}.reference-grid h3{font-size:14px;color:var(--text);margin-top:0}.reference-grid p{margin-bottom:22px}footer{padding:22px 32px;font-size:10px;color:var(--muted);max-width:1720px;margin:auto}footer span{display:block;margin-top:8px}.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}.skip{position:absolute;left:16px;top:-100px;background:var(--accent);color:#10161e;padding:10px;z-index:2}.skip:focus{top:5px}[hidden]{display:none!important}@media(max-width:1000px){main{padding:0 18px}.toolbar{flex-wrap:wrap}.clock{margin-left:0}.lessonbar{flex-wrap:wrap}.lessonbar>span{width:100%}.workbench{grid-template-columns:minmax(0,1.1fr) minmax(310px,1fr)}.environment{display:none}}@media(max-width:720px){header{padding:18px}.safety{padding:12px 18px}main{padding:0 12px}.lessonbar{gap:8px}.lessonbar select{min-width:0;flex:1}.lessonbar>label{width:100%}.lessonbar>span{font-size:11px}.toolbar{gap:7px}.toolbar button{flex:1 1 90px}.toolbar .primary{flex-basis:100%}.clock{width:100%;padding:8px 2px;grid-template-columns:auto 1fr}.clock small{grid-column:2;grid-row:1/3;align-self:center;text-align:right}.clock span{grid-column:1}.statusbar{flex-direction:column;gap:3px}.workbench{grid-template-columns:minmax(0,1fr)}.editor-pane{border-right:0}.monitor-pane{border-top:1px solid var(--line)}.editor{height:340px;grid-template-columns:35px minmax(0,1fr)}.editor textarea,.editor pre{font-size:12px}.editor textarea{padding-left:10px}.editor-footer{font-size:9px;flex-wrap:wrap}.instructions{padding:18px}.reference-grid{grid-template-columns:1fr;gap:0}summary span{float:none;display:block;padding-top:5px}.pane-title{padding:0 12px}.pane-title>span{font-size:10px}.io-row{padding:10px 14px}footer{padding:18px}.project-tools>button,.file-button{flex:1 1 auto}.symbols td:first-child{overflow-wrap:anywhere}}
h1 small{font-size:12px;letter-spacing:0;color:var(--accent)}
button.primary:hover:not(:disabled){background:var(--accent);color:#18202a;border-color:var(--accent)}
.grammar{width:100%;table-layout:fixed;margin:16px 0;font-size:13px}
.grammar th:first-child,.grammar td:first-child{width:130px;font-weight:600}
.grammar td{vertical-align:top;white-space:normal;overflow-wrap:anywhere;padding:12px}
.grammar code{font:12px/1.6 'SFMono-Regular',Consolas,monospace;color:var(--accent)}
@media(max-width:720px){.grammar th:first-child,.grammar td:first-child{width:90px}.grammar td{padding:9px}.grammar{min-width:0}h1{font-size:18px}}