:root{--ink:#071321;--navy:#081726;--panel:#102437;--line:#284359;--cyan:#7ee4f2;--blue:#348cf2;--white:#eff7ff;--muted:#a9bed1;--paper:#f7fafc;--body:#263c50}*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;background:var(--ink);color:var(--white)}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button,select,input,textarea{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,select:focus-visible,textarea:focus-visible,input:focus-visible{outline:3px solid #ffbf69;outline-offset:4px}[hidden]{display:none!important}.skip{position:absolute;left:-10000px}.skip:focus{left:20px;top:10px;background:white;color:black;padding:12px;z-index:20}.top{max-width:1600px;margin:auto;padding:20px 36px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #284359;gap:20px}.brand{display:flex;align-items:center;gap:12px}.brand img{width:46px;height:46px;object-fit:contain}.brand b{display:block;font-size:20px;letter-spacing:-.7px}.brand small{font-size:10px;letter-spacing:2.2px;color:var(--muted);display:block;margin-top:5px}.topnav{display:flex;align-items:center;gap:10px;font-size:12px}.pill{border:1px solid var(--line);border-radius:99px;padding:8px 12px;color:var(--cyan);font-size:11px;white-space:nowrap}.btn{padding:11px 16px;border:1px solid var(--line);border-radius:9px;background:#152c40;color:var(--white);font-size:12px;font-weight:bold;display:inline-flex;gap:8px;align-items:center;justify-content:center;min-height:40px}.btn:hover{background:#21435e}.btn.primary{background:var(--cyan);border-color:var(--cyan);color:#062035}.btn.primary:hover{background:#b3f4fa}.btn:disabled{opacity:.45;cursor:default}.hero{max-width:1600px;margin:auto;padding:32px 36px 28px;display:flex;justify-content:space-between;gap:35px;align-items:center;background:radial-gradient(ellipse at 75% 0%,#123750 0%,transparent 60%)}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;text-transform:uppercase;color:var(--cyan)}h1{font-size:clamp(30px,3vw,46px);letter-spacing:-1.8px;line-height:1.08;margin:12px 0 10px;max-width:620px}h1 span{color:var(--cyan)}.hero p{color:var(--muted);font-size:14px;line-height:1.6;margin:0;max-width:660px}.kitcard{flex:0 0 310px;padding:19px 22px;border:1px solid #32516b;border-radius:14px;background:linear-gradient(130deg,#17344d,#0e2235);display:flex;gap:16px;align-items:center;box-shadow:0 15px 45px #0003}.book{width:65px;height:87px;background:linear-gradient(145deg,#0b1828,#1d5580);border:1px solid #5a8dad;border-left:6px solid #396783;border-radius:3px 6px 6px 3px;transform:rotate(-7deg);padding:10px 6px;box-shadow:10px 10px 10px #0003;flex-shrink:0}.book img{width:20px}.book span{font-size:8px;line-height:1.3;display:block;margin-top:7px}.kitcard b{font-size:14px;display:block}.kitcard p{font-size:11px;margin:7px 0 12px}.kitcard a{font-size:11px;color:var(--cyan);}.workspace{max-width:1600px;margin:auto;padding:0 36px 30px;display:grid;grid-template-columns:190px minmax(340px,1fr) minmax(370px,1.08fr);gap:18px;align-items:start}.chapters{padding-top:8px;position:sticky;top:16px}.chapters .eyebrow{margin:12px 0 18px;color:var(--muted);font-size:9px}.chapter{width:100%;text-align:left;display:flex;gap:11px;align-items:center;padding:14px 10px;background:transparent;color:var(--muted);border:1px solid transparent;border-radius:10px;margin:4px 0}.chapter:hover{background:#102b40}.chapter[aria-current=step]{background:linear-gradient(105deg,#234565,#112d43);border-color:#39799a;color:white}.chapter .num{width:27px;height:27px;border:1px solid #45637b;border-radius:50%;display:grid;place-items:center;flex-shrink:0;font-size:10px}.chapter[aria-current=step] .num{background:var(--cyan);color:var(--ink);border-color:var(--cyan)}.chapter b{font-size:12px;line-height:1.4}.chapter small{display:block;font-size:10px;margin-top:4px;color:var(--muted)}.progressbox{border-top:1px solid var(--line);margin-top:20px;padding:18px 7px;color:var(--muted);font-size:11px;line-height:1.6}.progressbox progress{width:100%;height:5px;accent-color:var(--cyan);margin:10px 0}.local{font-size:10px;color:#91aabd;line-height:1.6}.chapter-notice{font-size:11px;line-height:1.6;color:var(--muted);margin-top:20px;border-left:2px solid #396783;padding-left:12px}.lesson{background:var(--paper);color:var(--body);border-radius:15px;overflow:hidden;min-width:0;box-shadow:0 18px 50px #0002}.lesson-head{padding:24px 25px 20px}.lesson-head .eyebrow{color:#276e92;font-size:9px}.lesson-head h2{font-size:27px;letter-spacing:-1px;line-height:1.16;margin:11px 0}.lesson-head p{font-size:13px;line-height:1.6;margin:0;color:#546c80}.tabs{display:flex;padding:0 25px;background:#e8f0f6;border-top:1px solid #d4e1eb;border-bottom:1px solid #d4e1eb}.tabs button{border:0;background:none;color:#526a7b;padding:15px 8px;font-size:11px;font-weight:bold;border-bottom:3px solid transparent;flex:1}.tabs button[aria-selected=true]{color:#0c527b;border-color:#187ba7}.content{padding:23px 25px}.content p{font-size:13px;line-height:1.7;margin:0 0 16px}.step{position:relative;padding-left:29px;margin-top:21px}.step .stepnum{position:absolute;left:0;top:0;font-size:10px;color:#3980a4;border:1px solid #b7cfdf;border-radius:50%;width:20px;height:20px;display:grid;place-items:center}.step h3{font-size:14px;margin:0 0 8px;letter-spacing:-.2px}.step p{font-size:12px;line-height:1.7}.callout{background:#e7f2f7;border:1px solid #c8dfe9;border-left:3px solid #1e93b7;padding:14px 16px;margin:18px 0;border-radius:0 8px 8px 0}.callout b{display:block;font-size:10px;letter-spacing:1px;text-transform:uppercase;color:#216080;margin-bottom:7px}.callout p{font-size:12px;line-height:1.6;margin:0}.callout.warm{background:#fff7e9;border-color:#ebd9b8;border-left-color:#b98c36}.callout.warm b{color:#7d5e23}.codehead{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:20px;font-size:11px;font-weight:bold}.codehead button{font-size:10px;border:1px solid #bfd0dd;background:white;color:#1b526f;padding:5px 8px;border-radius:5px}pre{background:#0b2032;color:#c6ebf7;border-radius:8px;padding:16px;font-size:10px;line-height:1.7;white-space:pre-wrap;overflow-wrap:anywhere;font-family:Consolas,monospace;margin:10px 0 16px}.reading{display:block;background:white;border:1px solid #cddde8;border-radius:8px;padding:13px;font-size:12px;line-height:1.5;margin:18px 0 0}.reading small{display:block;font-size:9px;letter-spacing:1px;color:#5b788e;margin-bottom:5px}.reading strong{color:#1a6285}.lesson-foot{padding:17px 25px;display:flex;justify-content:space-between;gap:10px;background:#e8f0f6;border-top:1px solid #d4e1eb}.lesson-foot .btn{color:#163c58;background:white;border-color:#b8cfdf}.lesson-foot .btn.primary{background:#123e5b;color:white}.controlcard{background:#e5eff7;border:1px solid #c7d8e6;border-radius:11px;padding:20px;margin-bottom:18px}.controlcard .controlid{font-size:27px;font-weight:bold;color:#176484;letter-spacing:-1px}.controlcard h3{font-size:14px;margin:8px 0 10px}.controlcard p{margin:0}.controlcard small{display:block;font-size:10px;color:#466884;margin-bottom:18px;text-transform:uppercase;letter-spacing:1px}.source-list{list-style:none;margin:14px 0 0;padding:0}.source-list li{font-size:11px;line-height:1.5;margin:10px 0}.source-list a{color:#235d7f;}.evidence-label{font-size:12px;font-weight:bold;display:block;margin-bottom:9px}.help{font-size:11px!important;color:#5a6f7f}.evidence-text{width:100%;min-height:140px;resize:vertical;background:white;border:1px solid #aec6d7;border-radius:8px;padding:12px;color:#263c50;font-size:12px;line-height:1.6}.checklist label{display:flex;align-items:flex-start;gap:9px;margin:15px 0;font-size:12px;line-height:1.5;cursor:pointer}.checklist input{accent-color:#0f7196;margin-top:2px;width:16px;height:16px;flex-shrink:0}.quiz{margin-top:25px;padding-top:20px;border-top:1px solid #cfdee8}.quiz h3{font-size:15px}.quiz .answer{display:block;width:100%;text-align:left;border:1px solid #c7d8e4;border-radius:7px;background:#fff;color:#324f65;padding:12px;margin:8px 0;font-size:12px;line-height:1.5}.quiz .answer.selected{border-color:#247b9a;background:#dceff5}.feedback{font-size:12px!important;padding:12px;background:#edf4e8;border-radius:7px}.quiz .feedback.wrong{background:#fff1dd}.evidence-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.evidence-actions .btn{font-size:11px;background:#164765}.evidence-actions label{cursor:pointer}.save-state{font-size:10px;color:#516f80;min-height:17px;margin-top:6px}.network{position:sticky;top:16px;min-width:0}.network-panel{border:1px solid #315069;border-radius:15px;overflow:hidden;background:#0c1d2e}.network-head{padding:19px 19px 14px;display:flex;justify-content:space-between;align-items:center;gap:10px}.network-head h2{font-size:16px;margin:5px 0 0;letter-spacing:-.3px}.network-head .eyebrow{font-size:8px}.network-head button{font-size:10px;padding:8px;min-height:32px}.viewbar{display:flex;gap:5px;padding:0 18px 13px}.viewbar button{border:1px solid #325269;border-radius:6px;color:#b7cbdc;background:transparent;padding:8px 10px;font-size:10px}.viewbar button[aria-pressed=true]{color:#d2fbff;background:#244860;border-color:#5087a1}.stage{height:325px;position:relative;background:radial-gradient(ellipse at center,#173347,#071626);touch-action:none}.stage canvas{display:block;width:100%;height:100%}.stage-top{position:absolute;left:17px;top:10px;right:17px;pointer-events:none;display:flex;justify-content:space-between;gap:10px;font-size:9px;color:#9cc1d4;letter-spacing:1px;text-transform:uppercase;z-index:2}.stage-tag{background:#0a1b2aca;border:1px solid #335a6e;padding:6px 8px;border-radius:5px}.stage-help{position:absolute;left:0;right:0;bottom:8px;text-align:center;font-size:9px;color:#8ba9c0;pointer-events:none}.fallback{padding:75px 20px;text-align:center;line-height:1.6}.system-buttons{display:flex;gap:7px;flex-wrap:wrap;padding:12px 17px;border-top:1px solid #25465c}.system-buttons button{border:1px solid #31526a;border-radius:7px;background:#102d42;color:#bfd7e8;font-size:9px;padding:8px 10px}.system-buttons button[aria-pressed=true]{color:var(--cyan);border-color:#6bb9c9}.network-caption{padding:4px 19px 17px}.network-caption p{color:#bfd1e0;font-size:12px;line-height:1.6;margin:6px 0 0;min-height:56px}.network-caption strong{font-size:11px;color:#7bdde9}.flow-controls{padding:13px 18px;background:#132a3c;display:flex;justify-content:space-between;gap:10px;align-items:center;border-top:1px solid #2d4b61}.flow-controls label{font-size:10px;color:#b8ccda}.flow-controls select{max-width:125px;border:1px solid #3c647e;border-radius:5px;background:#0e2539;color:white;padding:7px;font-size:10px}.flow-controls button{font-size:10px;padding:8px 12px;min-height:32px}.node-details{border-top:1px solid #28475e;padding:15px 19px}.node-details small{color:#89aabe;font-size:9px;letter-spacing:1px}.node-details h3{margin:7px 0;font-size:14px}.node-details p{font-size:11px;line-height:1.6;color:#acc6d7;margin:0}.media-card{border:1px solid #2c4860;border-radius:12px;padding:17px 18px;margin-top:14px;display:flex;gap:13px;align-items:center;background:linear-gradient(110deg,#122b40,#0b1c2d)}.media-icon{border:1px solid #47728c;border-radius:9px;width:44px;height:44px;display:grid;place-items:center;flex-shrink:0;color:#8db7d0;font-size:18px}.media-card small{color:var(--cyan);font-size:8px;letter-spacing:1.4px;text-transform:uppercase}.media-card h3{font-size:12px;margin:6px 0}.media-card p{font-size:10px;color:#a6bdcf;line-height:1.5;margin:0}.resource-link{margin-top:13px;display:block;color:#86ddeb;font-size:11px;text-align:right}.statusbar{padding:15px 36px;border-top:1px solid #223e54;max-width:1600px;margin:auto;color:#89a5ba;font-size:10px;display:flex;justify-content:space-between;gap:20px;line-height:1.6}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#d4f6fc;color:#07293b;border:1px solid #77d3e5;padding:12px 20px;border-radius:9px;font-size:12px;z-index:40;box-shadow:0 5px 25px #0005;max-width:90vw}.info{margin:22px 0 0;font-size:12px}.info summary{cursor:pointer;color:#47738e}.info p{font-size:11px;margin-top:9px}.configtable{width:100%;border-collapse:collapse;font-size:11px;margin:18px 0}.configtable td{padding:9px 6px;border-bottom:1px solid #d5e2ec}.configtable td:first-child{font-weight:bold}.complete-button{margin-top:16px;width:100%;background:#1b6c8b!important}.done-message{font-size:11px!important;margin-top:12px!important;color:#1c657c}.mobile-tools{display:none}.sbd-account-progress{max-width:1440px;margin:20px auto;padding:20px 24px;border:1px solid #284359;border-radius:14px;background:#102437;color:#eff7ff;font:14px/1.6 Arial,sans-serif}.sbd-account-progress p{margin:6px 0 12px}.sbd-account-progress button,.sbd-account-progress a{display:inline-block;min-height:44px;margin:4px 10px 4px 0;padding:10px 14px;border:1px solid #6cc7d8;border-radius:8px;background:transparent;color:#b8f2fb;font:inherit;text-decoration:none;cursor:pointer}.sbd-account-progress button:disabled{opacity:.6}.guide-pending .workspace{visibility:hidden}@media(min-width:1450px){.stage{height:370px}.lesson-head h2{font-size:30px}.content p{font-size:14px}.step p{font-size:13px}.workspace{grid-template-columns:205px minmax(420px,1fr) minmax(460px,1.05fr)}}@media(max-width:1120px){.top,.hero{padding-left:22px;padding-right:22px}.workspace{padding-left:22px;padding-right:22px;grid-template-columns:155px minmax(310px,1fr) minmax(300px,.95fr);gap:12px}.chapter{padding:12px 6px;gap:7px}.chapter b{font-size:11px}.lesson-head,.content{padding:21px}.stage{height:280px}.kitcard{flex-basis:260px}.network-head{padding:16px}.topnav .pill{display:none}}@media(max-width:930px){.workspace{grid-template-columns:165px 1fr}.network{position:static;grid-column:2;grid-row:2}.chapters{grid-row:1/3}.lesson{grid-column:2}.kitcard{display:none}.hero p{max-width:620px}.stage{height:365px}.network-panel{margin-top:4px}}@media(max-width:620px){.top{padding:15px 16px}.brand b{font-size:17px}.brand img{width:37px;height:37px}.brand small{font-size:8px;letter-spacing:1.5px}.topnav .btn{font-size:10px;padding:9px 11px}.topnav .journal{display:none}.hero{padding:23px 18px}.hero h1{font-size:34px}.hero p{font-size:12px}.hero .eyebrow{font-size:8px}.workspace{display:flex;flex-direction:column;padding:0 14px 22px;gap:13px}.chapters{position:static;width:100%;padding:0}.chapters>.eyebrow,.progressbox,.chapter-notice{display:none}#chapter-list{display:grid;grid-template-columns:repeat(5,1fr);gap:5px}.chapter{padding:9px 4px;flex-direction:column;gap:6px;margin:0;text-align:center}.chapter b{font-size:9px;line-height:1.3}.chapter small{display:none}.chapter .num{width:24px;height:24px}.lesson{width:100%;order:3}.network{width:100%;order:2}.stage{height:290px}.media-card{display:none}.network-caption p{min-height:0;font-size:11px}.node-details{display:none}.network-head{padding:14px 16px}.viewbar{padding-bottom:8px}.lesson-head h2{font-size:26px}.content{padding:22px}.lesson-head{padding:22px}.statusbar{padding:18px;display:block}.statusbar span{display:block}.resource-link{text-align:left;padding-left:3px}.topnav{gap:5px}.system-buttons{padding:10px 15px}.mobile-tools{display:block;font-size:10px;color:var(--muted);margin:10px 3px 0}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}@media print{body{background:white;color:black}.top,.hero,.chapters,.network,.lesson-foot,.tabs,.statusbar{display:none}.workspace{display:block;padding:0}.lesson{box-shadow:none}.content{padding:0}.lesson-head{padding:0 0 15px}.btn{display:none}pre{background:#eee;color:black}}
.foundation{margin:24px 0 28px;padding:20px;background:#fff;border:1px solid #d5e5ed;border-top:3px solid #77c8d8;border-radius:10px}.foundation>.eyebrow{color:#276e92;font-size:9px}.foundation h3{font-size:21px;line-height:1.2;margin:10px 0}.foundation h4{font-size:13px;line-height:1.5;margin:21px 0 6px}.foundation .foundation-summary{color:#526a7b}.foundation .callout{margin-bottom:12px}.book{background:linear-gradient(145deg,#fff,#eaf4f8);border-color:#9bb8c9;border-left-color:#173e56;color:#183b55}.book img{border-radius:3px}.model-link{margin:16px 0;padding:14px 16px;border:1px solid #9bd3e2;border-left:4px solid #1d7fa3;border-radius:8px;background:#eef9fc;color:#173e56}.model-link b{display:block;font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:#1d6f91}.model-link p{margin:6px 0 8px}.model-link a{font-weight:600;font-size:14px;color:#0d5f86}.wire{margin-top:28px;padding-top:18px;border-top:1px solid #d5e5ed}.configtable.ports{width:100%;font-size:13px}.configtable.ports caption{text-align:left;font-weight:bold;padding-bottom:8px}.configtable.ports th{text-align:left}@media(max-width:640px){.foundation{padding:16px}.stage-tag{font-size:8px}}
.brand small{text-transform:uppercase;font-size:11px;letter-spacing:1.6px}.top{flex-wrap:wrap;row-gap:14px}.topnav{flex-wrap:wrap;justify-content:flex-end}
@media(max-width:620px){.brand small{font-size:10px;letter-spacing:.9px}.topnav{width:100%;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}.topnav .btn{font-size:11px;padding:8px 6px;text-align:center;line-height:1.3}}

/* No underlines anywhere on the site (owner direction, 20 October 2026): links keep their color and weight. */
a,a:hover,a:focus,a:active,a:visited{text-decoration:none!important}
/* Course parts (course 1.1, 20 October 2026): a heading before each part's first lesson. */
.chapter-part{margin:16px 6px 6px;color:#7ee4f2;font:700 11px/1.3 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em;text-transform:uppercase}
.chapter-part:first-child{margin-top:4px}
/* Console checks (owner direction, 22 October 2026): the console steps lead; the command follows as an optional route. */
.console-check{margin:22px 0 14px;padding:18px 20px;border:1px solid #2b5b6d;border-left:4px solid #7ee4f2;border-radius:12px;background:#0e2638}
.console-check h3{margin:0 0 10px;color:#eaf8fb;font-size:1.05rem}
.console-tool{margin:12px 0 0}.console-tool b{display:block;color:#7ee4f2;font-size:.92rem}
.console-tool ol{margin:6px 0 0;padding-left:22px;color:#d7e9f1;line-height:1.55}
.console-tool li{margin:3px 0}
.console-note{margin:12px 0 0}.console-note b{color:#f7bd68}
.callout ul{margin:0;padding-left:18px;font-size:12px;line-height:1.6}.callout li+li{margin-top:4px}.callout.recap p{font-size:12px;margin:10px 0 0}.content .help{margin-top:8px}.info ul{font-size:12px;line-height:1.6;padding-left:18px;margin:10px 0}