.lab-wrap{width:min(1400px,calc(100% - 80px));margin-inline:auto}.lab-intro{display:grid;grid-template-columns:1.1fr 1fr;align-items:end;gap:50px;padding:56px 0 42px}.lab-intro h1{font-size:clamp(45px,5.3vw,73px)}.lab-intro .eyebrow{margin-bottom:18px}.intro-note{max-width:510px}.intro-note>p:first-child{font-size:17px;color:var(--text);line-height:1.6;margin-bottom:12px}.intro-note>p:nth-child(2){font-size:12px;color:var(--muted);margin-bottom:14px}.model-label{display:block;color:var(--green);font-size:9px;letter-spacing:.075em}.control-panel{border:1px solid var(--line);border-left:3px solid var(--green);padding:16px 18px;display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--panel)}.execution-buttons{display:flex;gap:8px}.lab-button{display:inline-flex;align-items:center;justify-content:center;gap:15px;min-height:40px;padding:9px 15px;border:1px solid var(--line);background:transparent;color:var(--text);font-size:11px;line-height:1.5;transition:border-color .15s,background .15s}.lab-button.primary{background:var(--green);border-color:var(--green);color:var(--bg)}.lab-button:hover:not(:disabled){border-color:var(--green)}.lab-button:disabled{cursor:default}.speed-control{display:flex;align-items:center;gap:13px;font-size:9px;color:var(--muted);letter-spacing:.08em}.speed-control input{width:100px;accent-color:var(--green)}.speed-control output{width:77px;color:var(--text);letter-spacing:0}.execution-state{display:grid;gap:2px;text-align:right;font-size:9px;color:var(--muted)}#run-state{color:var(--green);letter-spacing:.13em}.execution-state b{font-weight:normal;color:var(--text)}.status-line{min-height:24px;margin:10px 0 20px;color:var(--muted);font-size:11px}.machine-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:20px}.panel{border:1px solid var(--line);background:var(--panel);min-width:0}.panel-title{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:15px 18px;border-bottom:1px solid var(--line)}.panel-title h2{font-size:14px;letter-spacing:-.02em}.panel-title>span{font-size:8px;color:var(--muted);letter-spacing:.08em;white-space:nowrap}.register-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}.register{position:relative;padding:13px 12px 11px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);min-width:0}.register:nth-child(4n){border-right:0}.register:nth-last-child(-n+2){grid-column:span 2;border-bottom:0}.register:nth-last-child(1){border-right:0}.register-top{display:flex;justify-content:space-between;gap:5px;align-items:baseline}.register-name{color:var(--muted);font-size:10px}.register-value{font-size:18px;letter-spacing:-.02em;line-height:1.2}.register-bits{display:flex;justify-content:space-between;margin-top:10px;font-size:9px;line-height:1.2;color:#7f8c79;letter-spacing:-.06em}.register-bits span{min-width:5px}.register:nth-last-child(-n+2) .register-bits{justify-content:flex-start;gap:7px}.register.changed{animation:state-flash .65s ease-out}.register.changed .register-name{color:var(--green)}.changed-bit{color:var(--green)!important;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px;font-weight:bold}.register-change{display:block;color:var(--green);min-height:14px;font-size:8px;margin-top:7px;line-height:1.4;overflow-wrap:anywhere}.flag-heading{padding:12px 15px 8px;display:flex;justify-content:space-between;align-items:center}.flag-heading h3{font-size:10px;color:var(--muted);letter-spacing:.1em}.flag-heading span{font-size:8px;color:var(--muted)}.flags-grid{display:grid;grid-template-columns:repeat(8,1fr);padding:0 15px;gap:5px}.flag{padding:6px 0;text-align:center;border:1px solid var(--line);font-size:9px;color:var(--muted)}.flag strong{font-weight:normal;color:var(--text);margin-left:5px}.flag.changed{border-color:var(--green);animation:state-flash .65s ease-out}.flag.changed strong{text-decoration:underline;color:var(--green)}.bit-legend{font-size:8px;color:var(--muted);padding:12px 15px;margin:0}.legend-bit{color:var(--green);text-decoration:underline;text-underline-offset:3px;margin-right:5px}.preset-control{display:flex;align-items:center;gap:13px;padding:13px 17px 0}.preset-control label{font-size:8px;letter-spacing:.1em;color:var(--muted)}select{color:var(--text);background:var(--raised);border:1px solid var(--line);padding:7px;min-width:0;width:100%;font-size:10px}.lesson{font-size:10px;color:var(--muted);padding:10px 18px 13px;margin:0;line-height:1.7;min-height:74px}.listing-heading{display:grid;grid-template-columns:33px 87px 1fr;gap:8px;font-size:8px;letter-spacing:.05em;color:var(--muted);padding:7px 17px;background:var(--raised);border-block:1px solid var(--line)}.program-listing{max-height:270px;min-height:230px;overflow:auto;scrollbar-width:thin;scrollbar-color:var(--line) var(--panel)}.instruction-row{display:grid;grid-template-columns:33px 87px minmax(0,1fr);align-items:center;gap:8px;padding:9px 17px;border-bottom:1px solid #29312980;font-size:10px;position:relative}.instruction-row.current{background:#b8ff4010;box-shadow:inset 3px 0 var(--green)}.instruction-row.executed{color:var(--code)}.instruction-row.current .instruction-location{color:var(--green)}.breakpoint{height:22px;width:22px;padding:0;border:1px solid var(--line);background:transparent;border-radius:50%;line-height:1;font-size:11px;color:var(--green)}.breakpoint[aria-pressed=true]{background:var(--green);color:var(--bg);border-color:var(--green)}.instruction-location{font-size:9px;color:var(--muted)}.instruction-data{min-width:0}.instruction-data strong{display:block;font-weight:normal;line-height:1.4}.instruction-data small{display:block;font-size:8px;color:var(--muted);letter-spacing:.06em;margin-top:3px}.listing-note{font-size:8px;line-height:1.6;color:var(--muted);padding:12px 18px;margin:0}.listing-note em{font-style:normal;color:var(--text)}.trace-panel{margin-top:20px}.instruction-flow{display:grid;grid-template-columns:minmax(0,1fr) 30px minmax(0,1fr) 30px minmax(0,1fr);padding:18px 22px;align-items:center;gap:14px}.instruction-flow>div{min-width:0}.flow-label{display:block;font-size:8px;color:var(--muted);letter-spacing:.08em;margin-bottom:9px}.instruction-flow strong{display:block;font-size:15px;font-weight:normal;line-height:1.3;overflow-wrap:anywhere}.instruction-flow small{display:block;font-size:8px;color:var(--muted);margin-top:6px}.flow-arrow{font-size:23px;color:var(--muted);text-align:center}.current-instruction strong{color:var(--green)}.pointer-change{margin:0;padding:10px 22px;border-top:1px solid var(--line);color:var(--code);font-size:10px}.changes{padding:0 22px 13px;margin:0;font-size:10px;color:var(--muted);overflow-wrap:anywhere}.memory-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);gap:20px;margin-top:20px}.stack-address{display:flex;justify-content:space-between;gap:10px;font-size:9px;padding:15px 18px;color:var(--muted);flex-wrap:wrap}.stack-address strong{font-weight:normal;color:var(--green);margin-left:10px}.stack-grid{padding:0 18px;display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.stack-word{display:flex;align-items:center;justify-content:space-between;gap:8px;border-bottom:1px solid var(--line);font-size:10px;padding:7px 0}.stack-word>span{color:var(--muted);font-size:8px}.stack-word>strong{font-weight:normal}.stack-word em{font-style:normal;font-size:9px;margin-left:6px;color:var(--code)}.stack-word:first-child>span{color:var(--green)}.stack-word.changed{animation:state-flash .65s ease-out}.stack-byte.changed-bit{padding-bottom:2px}.panel-note{font-size:8px;color:var(--muted);padding:12px 18px 16px;margin:0;line-height:1.7}.memory-form{display:flex;gap:10px;align-items:end;padding:14px 18px 9px}.memory-form label{display:flex;align-items:center;gap:12px;font-size:8px;letter-spacing:.06em;color:var(--muted)}.memory-form input{font:inherit;font-size:11px;width:105px;padding:10px;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:0}.memory-form button{font-size:9px;min-height:37px}.memory-jumps{display:flex;align-items:center;gap:7px;padding:0 18px 12px;flex-wrap:wrap}.memory-jumps button{font-size:8px;color:var(--code);background:transparent;border:1px solid var(--line);padding:3px 8px;min-height:25px}.memory-jumps>span{margin-left:auto;font-size:8px;color:var(--muted)}.memory-grid{display:grid;grid-template-columns:repeat(16,minmax(0,1fr));gap:3px;padding:0 18px}.memory-byte{display:flex;justify-content:center;align-items:center;min-height:28px;background:var(--raised);font-size:9px;color:var(--muted);border:1px solid transparent}.memory-byte.program-byte{color:var(--text)}.memory-byte.current-byte{border-color:var(--green);color:var(--green)}.memory-byte.changed-bit{animation:state-flash .65s ease-out}.editor-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:20px;margin-top:20px}.editor-panel textarea{display:block;width:calc(100% - 36px);height:174px;resize:vertical;min-height:120px;margin:18px 18px 12px;padding:13px;line-height:1.9;font:inherit;font-size:11px;letter-spacing:.08em;background:var(--bg);color:var(--code);border:1px solid var(--line);border-radius:0}.editor-actions{display:flex;gap:10px;padding:0 18px;flex-wrap:wrap}.import-label{cursor:pointer;position:relative;overflow:hidden}.import-label input{position:absolute;inset:0;opacity:0;width:100%;cursor:pointer}.import-label:focus-within{outline:2px solid var(--green);outline-offset:3px}#editor-status{margin:0;padding:0 18px 14px;font-size:10px;color:var(--green)}.output-panel h3{font-size:9px;color:var(--muted);letter-spacing:.07em;padding:17px 18px 8px}.output-panel pre{margin:0 18px;min-height:54px;padding:10px 13px;border:1px solid var(--line);background:var(--bg);color:var(--green);font-size:12px}.model-details{margin:28px 0 48px;border-block:1px solid var(--line);font-size:11px}.model-details summary{padding:18px 0;cursor:pointer;color:var(--text)}.model-details p{color:var(--muted);max-width:1000px;font-size:10px}.model-details kbd{border:1px solid var(--line);padding:1px 4px;font:inherit;color:var(--text)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.error{color:#ffc087!important}.footer{margin-top:0}.footer p{font-size:10px}.panel,.instruction-row,.register,.flag{transition:background .2s}.control-panel.is-running{border-color:var(--green)}@keyframes state-flash{0%{background:#b8ff4029}100%{background:transparent}}@media(min-width:1550px){.lab-intro h1{font-size:80px}}@media(max-width:1050px){.lab-wrap{width:calc(100% - 48px)}.control-panel{flex-wrap:wrap;gap:14px}.execution-state{margin-left:auto}.machine-layout{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:14px}.register{padding-inline:9px}.register-bits{font-size:8px}.flags-grid{grid-template-columns:repeat(4,1fr)}.memory-layout,.editor-layout{gap:14px}.memory-grid{grid-template-columns:repeat(8,minmax(0,1fr))}.stack-grid{grid-template-columns:1fr}.stack-word:nth-child(n+5){display:none}.lesson{min-height:92px}.instruction-row,.listing-heading{grid-template-columns:25px 76px minmax(0,1fr);padding-inline:12px;gap:6px}.instruction-location{font-size:8px}}@media(max-width:760px){.lab-wrap{width:calc(100% - 32px)}.header{padding:22px 0;align-items:start}.header .brand{font-size:20px;gap:8px}.header .version{font-size:8px;margin-left:0}.header nav{gap:12px;font-size:9px;flex-wrap:wrap;justify-content:end;max-width:180px}.header nav .github-link{padding:4px 7px}.lab-intro{grid-template-columns:1fr;gap:22px;padding:35px 0 27px}.lab-intro h1{font-size:56px}.lab-intro .eyebrow{font-size:8px}.intro-note>p:first-child{font-size:14px}.intro-note>p:nth-child(2){font-size:11px}.model-label{font-size:8px;line-height:1.6}.control-panel{padding:13px 12px;gap:12px}.execution-buttons{width:100%;gap:6px}.execution-buttons .lab-button{flex:1;gap:9px;padding:8px 7px;font-size:10px}.speed-control{gap:9px;font-size:8px}.speed-control input{width:80px}.speed-control output{width:67px}.execution-state{font-size:8px}.status-line{font-size:10px;margin-bottom:14px}.machine-layout,.memory-layout,.editor-layout{grid-template-columns:1fr;gap:14px}.panel-title{padding:13px 14px}.panel-title h2{font-size:12px}.panel-title>span{font-size:7px}.register-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.register{padding:12px 8px 9px}.register-name{font-size:9px}.register-value{font-size:16px}.register-bits{font-size:7px;letter-spacing:-.1em}.register-bits span{min-width:3px}.register-change{font-size:7px}.register:nth-last-child(-n+2) .register-bits{gap:5px}.flags-grid{grid-template-columns:repeat(8,1fr);padding-inline:10px;gap:3px}.flag{font-size:8px}.flag strong{display:block;margin-left:0}.flag-heading{padding-inline:10px}.flag-heading span{font-size:7px}.bit-legend{padding-inline:10px;font-size:7px}.program-listing{min-height:180px;max-height:270px}.lesson{min-height:0}.instruction-row,.listing-heading{grid-template-columns:30px 90px minmax(0,1fr);padding-inline:14px}.instruction-location{font-size:9px}.trace-panel,.memory-layout,.editor-layout{margin-top:14px}.instruction-flow{grid-template-columns:minmax(0,1fr);padding:15px 16px;gap:11px}.instruction-flow>div{padding-bottom:10px;border-bottom:1px solid var(--line)}.instruction-flow>div:last-child{border-bottom:0;padding-bottom:0}.flow-arrow{display:none}.instruction-flow strong{font-size:13px}.flow-label{margin-bottom:5px}.current-instruction{border-left:2px solid var(--green);padding-left:10px}.pointer-change,.changes{padding-inline:16px;font-size:9px}.stack-grid{grid-template-columns:1fr 1fr;padding-inline:14px;gap:0 15px}.stack-word:nth-child(n+5){display:flex}.memory-form{padding-inline:14px}.memory-form label{font-size:7px;gap:8px}.memory-form input{width:88px}.memory-grid{padding-inline:14px}.memory-jumps{padding-inline:14px}.panel-note{padding-inline:14px}.editor-panel textarea{width:calc(100% - 28px);margin-inline:14px;font-size:9px;letter-spacing:.04em;padding:10px}.editor-actions{padding-inline:14px;gap:7px}.editor-actions .lab-button{font-size:9px;padding-inline:11px}.model-details{margin-bottom:30px}.model-details summary{font-size:10px}.footer{gap:16px}.footer>div{font-size:8px}}@media(max-width:360px){.lab-wrap{width:calc(100% - 24px)}.header .brand svg{width:23px;height:23px}.header .version{display:none}.header nav{max-width:158px;gap:8px}.lab-intro h1{font-size:48px}.execution-buttons .lab-button{gap:5px;font-size:9px}.speed-control{gap:5px}.speed-control input{width:64px}.speed-control output{width:59px}.execution-state{font-size:7px}.register{padding-inline:6px}.register-value{font-size:14px}.register-bits{font-size:6px}.register-change{font-size:6px}.stack-grid{grid-template-columns:1fr}.stack-word:nth-child(n+5){display:none}.memory-form{gap:7px}.memory-form label{gap:6px}.memory-form input{width:75px}.memory-jumps>span{width:100%;margin-left:0}.panel-title>span{letter-spacing:0}.flag-heading span{font-size:6px}.instruction-row,.listing-heading{grid-template-columns:25px 76px minmax(0,1fr);gap:7px}.instruction-location{font-size:8px}}@media(prefers-reduced-motion:reduce){.register.changed,.flag.changed,.stack-word.changed,.memory-byte.changed-bit{animation:none}*{transition:none!important}}
.program-listing{position:relative}
.register{display:block}
.header nav a:first-child{display:block}
.instruction-row.current{animation:pointer-arrive .45s ease-out}
@keyframes pointer-arrive{from{box-shadow:inset 8px 0 var(--green);background:#b8ff402a}to{box-shadow:inset 3px 0 var(--green);background:#b8ff4010}}
@media(prefers-reduced-motion:reduce){.instruction-row.current{animation:none}}
@media(max-width:760px){.register-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.register:nth-child(2n){border-right:0}.register:nth-last-child(-n+2){grid-column:auto}.register{padding-inline:10px}.register-value{font-size:18px}.register-bits{font-size:9px;letter-spacing:0}.register-bits span{min-width:5px}.register:nth-last-child(-n+2) .register-bits{justify-content:space-between;gap:0}.register-change{font-size:8px}.stack-word:nth-child(n+5){display:flex}}
.execution-buttons{flex-wrap:wrap}.history-note{margin:18px 0 28px;font-size:11px;color:var(--muted)}.history-note strong{color:var(--green)}@media(max-width:650px){.execution-buttons .lab-button{flex:1 1 calc(33.333% - 6px)}}
.timeline-panel{margin-bottom:24px;padding:20px;min-width:0}.timeline-panel label{display:block;font-size:11px;color:var(--muted)}.timeline-panel output{display:block;margin-block:8px;color:var(--green);overflow-wrap:anywhere}.timeline-panel input{width:100%;accent-color:var(--green);margin-block:12px}
.hex-label{display:block;color:var(--green);font-size:11px;padding:20px 18px 8px}#hex-editor{min-height:100px;height:100px}
#timeline-steps{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:6px;font-size:10px}#timeline-steps li{padding:6px 8px;border:1px solid var(--line);overflow-wrap:anywhere}#timeline-steps .selected{border-color:var(--green);color:var(--green);text-decoration:underline}#timeline-steps .future{border-style:dashed;color:var(--muted)}
#program-link{width:calc(100% - 40px);min-width:0;margin:8px 20px 0;padding:10px;background:var(--bg);border:1px solid var(--line);color:var(--text);font:11px var(--mono)}@media(max-width:760px){#program-link{width:calc(100% - 28px);margin-inline:14px}}