:root{--bg:#0d161d;--panel:#14232c;--line:#2b3e48;--ink:#edf4f4;--muted:#9bb0ba;--mint:#b9efc9;--amber:#f1c486;--red:#ffa79b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px 'DM Sans',Segoe UI,sans-serif}a{color:inherit;text-decoration:none}button,select,input{font:inherit}button{cursor:pointer}button:disabled{opacity:.4;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--mint);outline-offset:4px}header{padding:25px 4.5%;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:25px}.brand{font:600 23px 'Space Grotesk',sans-serif;display:flex;align-items:center;gap:12px;letter-spacing:-.7px}.brand-mark{display:grid;place-items:center;width:39px;height:39px;background:var(--mint);color:#173025;border-radius:8px;position:relative;font-size:26px}.brand-mark>span{font-size:14px;position:absolute;right:4px;top:2px}.brand-sub{font:8px Consolas,monospace;letter-spacing:1.8px;border-left:1px solid #43535d;padding-left:20px;margin-left:8px;color:var(--muted)}nav{display:flex;align-items:center;gap:24px}nav button,footer button{border:0;background:transparent;color:var(--muted);font-size:11px}nav button:hover,footer button:hover{color:var(--mint)}.edition{font:9px Consolas,monospace;letter-spacing:1px;color:#7e98a6;border:1px solid var(--line);padding:9px;border-radius:3px}main{max-width:1450px;padding:45px 4.5% 70px;margin:auto}h1,h2,h3{font-family:'Space Grotesk',sans-serif;font-weight:500}h1{font-size:clamp(37px,4.2vw,61px);letter-spacing:-2.4px;line-height:1.09;margin:0 0 23px}h1 em{font-style:normal;color:var(--mint)}h2{font-size:29px;letter-spacing:-.9px;margin:0}h3{font-size:20px;margin:0 0 12px;letter-spacing:-.4px}p{color:var(--muted);line-height:1.75}.eyebrow{display:flex;align-items:center;gap:10px;font-size:9px;font-weight:600;letter-spacing:1.6px;text-transform:uppercase;color:var(--mint);margin-bottom:24px;line-height:1.6}.eyebrow:before{content:'';width:25px;height:1px;background:var(--mint);flex-shrink:0}.hero{display:grid;grid-template-columns:1fr 1.05fr;gap:50px;align-items:center;padding:10px 0 40px}.lead{font-size:15px;max-width:465px;margin:0 0 25px}.hero-art{border:1px solid #3b535b;border-radius:13px;overflow:hidden;background:#12232b}.hero-art svg{width:100%;height:auto;display:block}.scene-caption{border-top:1px solid #324b57;padding:15px 19px;font:8px Consolas,monospace;letter-spacing:1px;color:#9eb8bd;display:flex;align-items:center;gap:9px}.live-dot{display:inline-block;height:6px;width:6px;background:var(--mint);border-radius:50%;flex-shrink:0}.hero-buttons{display:flex;align-items:center;gap:15px}.primary{background:var(--mint);color:#173125;border:1px solid var(--mint);font-weight:700;padding:13px 18px;border-radius:5px;font-size:12px;display:inline-flex;align-items:center;justify-content:center;gap:25px}.primary:hover{background:#d8ffe2}.secondary{background:transparent;border:1px solid #506570;color:#d5e6ea;padding:11px 15px;border-radius:5px;font-size:12px}.secondary:hover{background:#213741}.quiet{background:transparent;border:0;color:var(--muted);font-size:11px;padding:10px 0}.quiet:hover{color:var(--mint)}.hero-meta{display:flex;gap:15px;color:#859ca8;font-size:9px;margin-top:25px;flex-wrap:wrap}.hero-meta>span+span{border-left:1px solid var(--line);padding-left:15px}.path-strip{display:flex;justify-content:space-between;align-items:center;gap:15px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:25px 0;margin:0 0 47px}.path-strip>div{display:flex;gap:14px;align-items:center}.path-strip span{font:12px Consolas,monospace;color:var(--mint);border:1px solid #426253;width:32px;height:32px;display:grid;place-items:center;border-radius:50%}.path-strip b{font-size:12px;font-weight:500;color:#c9dce0}.path-strip i{font-style:normal;color:#536b77}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:26px}.section-heading .eyebrow{margin-bottom:10px}.completion{font:9px Consolas,monospace;color:var(--muted);line-height:1.5;text-align:right}.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:25px}.filters button{padding:9px 13px;background:transparent;border:1px solid var(--line);border-radius:5px;color:#a7bec8;font-size:11px}.filters button.active{background:#263d34;color:var(--mint);border-color:#547a60}.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.module-card{border:1px solid var(--line);border-radius:8px;padding:23px;background:var(--panel);display:flex;flex-direction:column;min-height:290px}.module-card.available{background:linear-gradient(140deg,#233c34,#15252d 75%);border-color:#537562}.card-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:22px}.module-icon{font-size:28px;color:#a3c6cf;line-height:1}.available .module-icon{color:var(--mint)}.badge{font:8px Consolas,monospace;padding:5px 7px;border:1px solid #455c68;border-radius:3px;letter-spacing:.7px;color:#8ea7b5;line-height:1.4;white-space:nowrap}.badge.ready{color:var(--mint);border-color:#4f705d}.category{font-size:8px;letter-spacing:1.3px;text-transform:uppercase;color:#91aab5;margin-bottom:9px}.module-card h3{font-size:29px;margin:0 0 6px;letter-spacing:-1px}.module-full{font-size:11px;color:#9bb4bd;margin:0 0 18px;min-height:20px}.story-title{font:15px 'Space Grotesk',sans-serif;color:#d2e3e5;margin:0 0 24px}.card-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px;border-top:1px solid var(--line);padding-top:17px;margin-top:auto}.card-bottom>span{font:8px Consolas,monospace;color:#7f9ba9}.card-button{background:var(--mint);color:#173125;border:0;border-radius:4px;padding:9px 11px;font-size:10px;font-weight:600}.editorial{display:flex;align-items:center;gap:28px;border-top:1px solid var(--line);margin-top:38px;padding-top:32px}.editorial>span{font-size:52px;color:var(--amber);font-weight:400}.editorial h3{font-size:20px;margin:0 0 8px}.editorial p{font-size:12px;max-width:850px;margin:0}.muted{color:var(--muted)}footer{padding:24px 4.5%;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;color:#a9bec7;font-size:10px}footer a{font-size:10px;color:#819ca9}.lesson-top{display:flex;align-items:center;gap:24px;margin-bottom:25px}.lesson-label{font-size:10px;color:var(--muted);flex:1}.lesson-title{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:30px}.lesson-title h1{font-size:39px;letter-spacing:-1.4px;line-height:1.15;max-width:750px;margin:0}.lesson-title .eyebrow{margin-bottom:12px}.lesson-title .secondary{flex-shrink:0}.lesson-grid{display:grid;grid-template-columns:205px minmax(0,1fr);gap:38px}.chapter-rail{border-right:1px solid var(--line);padding-right:22px}.small-label{font-size:9px;text-transform:uppercase;letter-spacing:1.2px;color:#9cb4bf;display:block;line-height:1.6}.chapter-rail>.small-label{margin-bottom:20px}.chapter-rail>button{display:flex;width:100%;align-items:center;gap:10px;padding:13px 8px;border:1px solid transparent;background:transparent;color:#8ca7b5;text-align:left;border-radius:5px;margin-bottom:5px}.chapter-rail>button>span{font:10px Consolas,monospace;color:#698894}.chapter-rail>button>b{font-size:11px;font-weight:500;line-height:1.5}.chapter-rail>button.current{background:#253c33;color:var(--mint);border-color:#496b57}.chapter-rail>button.current>span,.chapter-rail>button.past>span{color:var(--mint)}.context-card{border-top:1px solid var(--line);padding-top:25px;margin-top:25px}.context-card>span{font-size:8px;letter-spacing:1px;color:#7e9aa8}.context-card>b{display:block;margin:10px 0;font-size:13px;font-weight:500}.context-card p{font-size:11px;margin:0}.story-heading{margin:0 0 23px}.scene-number{font:9px Consolas,monospace;letter-spacing:1px;color:var(--mint);display:block;margin-bottom:12px}.story-heading h2{font-size:27px;margin:0 0 9px}.story-heading p{font-size:13px;max-width:850px;margin:0}.simulation{border:1px solid #3a5360;border-radius:9px;overflow:hidden;background:#13232d}.simulation-top{display:flex;justify-content:space-between;gap:15px;padding:14px 18px;border-bottom:1px solid #2c444f;color:#a6c1ca;font:8px Consolas,monospace;letter-spacing:1px}.simulation-top>span:first-child{display:flex;align-items:center;gap:8px}.simulation-top>span:last-child{color:#789ba8;font-size:8px;letter-spacing:0}.flow-scene{display:block;width:100%;height:auto}.flow-scene [role=button]{cursor:pointer}.flow-scene [role=button]:hover{filter:brightness(1.25)}.simulation-result{display:flex;align-items:center;gap:16px;padding:18px 22px;border-top:1px solid #3a5360;background:#1d362f}.simulation-result>span{font-size:30px;color:var(--mint);width:30px;text-align:center;flex-shrink:0}.simulation-result b{font-size:13px;font-weight:500;color:#d8efdf}.simulation-result p{font-size:11px;line-height:1.6;margin:5px 0 0;color:#a6c2b4}.simulation-result.block{background:#39292d}.simulation-result.block>span{color:var(--red)}.simulation-result.block b,.simulation-result.block p{color:#f2c4bd}.simulation-result.warn{background:#3a3020}.simulation-result.warn>span{color:var(--amber)}.simulation-result.warn b,.simulation-result.warn p{color:#e5cca4}.simulation-result.observe{background:#243340}.simulation-result.observe>span{color:#a9c8eb}.simulation-result.observe b,.simulation-result.observe p{color:#b6cede}.experiment-panel{padding:23px;margin-top:20px;border:1px solid var(--line);background:#13222b;border-radius:8px}.experiment-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:18px}.fine{font-size:10px;line-height:1.7;color:#8faab6}.document-preview{border:1px solid #3d535e;background:#0f1d26;padding:18px;border-radius:6px}.document-preview>div{display:flex;align-items:center;gap:12px}.document-preview>div>span{font-size:24px;color:var(--amber)}.document-preview b{font-size:12px;font-weight:500}.document-preview small{font:8px Consolas,monospace;color:#bf9f73;display:block;margin-top:4px}.document-preview p{font:11px Consolas,monospace;color:#adc3cd;line-height:1.9;margin-bottom:0}mark{background:#4c3b24;color:#ebc18d;padding:3px}.control-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}fieldset{min-width:0;margin:0;border:1px solid #36505d;border-radius:6px;padding:18px}legend{padding:0 8px;font-size:11px;color:#c4d9dd}.toggle-label{display:flex;align-items:center;gap:10px;font-size:11px;color:#c2d6db;line-height:1.6;margin-bottom:17px}.toggle-label input{accent-color:var(--mint);height:15px;width:15px;flex-shrink:0}.control-grid fieldset:nth-child(2) .toggle-label{margin:17px 0 0}select{width:100%;background:#0f1c25;border:1px solid #49606c;color:#d2e5e9;border-radius:4px;padding:10px;font-size:11px;margin-top:8px}.policy-explanation{margin-top:18px;border-left:2px solid var(--mint);padding-left:14px}.policy-explanation>span,.payload>span{font:8px Consolas,monospace;letter-spacing:1px;color:#a3c1b2}.policy-explanation p{font-size:12px;margin:7px 0}.payload{border-top:1px solid var(--line);margin-top:17px;padding-top:17px}.payload>span{color:#87a5b6}.payload p{font:11px Consolas,monospace;line-height:1.8;color:#bdd1dc;margin:9px 0 0}.warning-button{padding:11px 14px;background:#443722;border:1px solid #806a43;border-radius:5px;color:var(--amber);margin-top:18px;font-size:11px}.story-navigation{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:25px;padding-top:22px;border-top:1px solid var(--line)}.story-navigation>span{font:10px Consolas,monospace;color:#7c9aa8}.source-note{margin-top:23px;font-size:11px;color:var(--muted)}summary{cursor:pointer;padding:10px 0;color:#a7c3cd;font-size:11px}details a,.source-link{color:var(--mint);font-size:11px}details p{font-size:11px}.learning-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:24px 0}.learning-grid article{background:#172b33;border:1px solid #35505a;border-radius:7px;padding:21px}.learning-grid article:nth-child(2){background:#252c2f;border-color:#57594b}.learning-grid article>span{font:8px Consolas,monospace;letter-spacing:1px;color:var(--mint)}.learning-grid article:nth-child(2)>span{color:var(--amber)}.learning-grid h3{font-size:18px;margin:13px 0 9px}.learning-grid p{font-size:12px;margin:0}.knowledge-check{border:1px solid #3b5262;border-radius:7px;padding:23px;background:#14232f}.knowledge-check h3{font-size:19px;margin:12px 0 18px}.answer-options{display:flex;flex-direction:column;gap:9px}.answer-options button{background:#1b2e3c;border:1px solid #3b5363;border-radius:5px;padding:13px;display:flex;align-items:center;gap:13px;color:#c8dce7;text-align:left;font-size:12px;line-height:1.5}.answer-options button>span{font:10px Consolas,monospace;background:#2a4355;padding:5px 8px;border-radius:3px}.answer-options button:hover{border-color:var(--mint)}.answer-options button.correct{background:#254637;border-color:#5e9873}.answer-options button.incorrect{background:#422f32;border-color:#935e58}.quiz-feedback{font-size:12px;padding:12px;border-left:2px solid var(--mint)}.quiz-feedback.correct{color:#bbdfc6}.quiz-feedback.incorrect{color:#efb6aa;border-color:var(--red)}.takeaway{border-left:2px solid var(--mint);padding-left:19px;margin-top:27px}.takeaway b{font-size:11px;color:var(--mint);text-transform:uppercase;letter-spacing:1px}.takeaway p{font-size:15px;color:#cfe1d8;margin:9px 0 17px}dialog{width:calc(100% - 35px);max-width:660px;max-height:88vh;overflow:auto;padding:35px;border:1px solid #4c7064;border-radius:10px;background:#15272f;color:var(--ink)}dialog::backdrop{background:#050b10d9;backdrop-filter:blur(4px)}dialog p,dialog li{font-size:13px;line-height:1.8;color:#a9c0c9}dialog h2{font-size:28px;margin-bottom:18px}dialog h3{font-size:19px}dialog a{color:var(--mint)}.close{float:right;padding:4px;font-size:18px}.script-preview{border-left:2px solid #759b84;padding-left:18px;margin:23px 0}.script-preview p{font-size:12px}.stream{animation:flow 2s linear infinite}.beacon{animation:blink 2.5s ease-in-out infinite}@keyframes flow{to{stroke-dashoffset:-48}}@keyframes blink{50%{opacity:.3}}@media(max-width:1100px){.hero{gap:25px}.hero h1{font-size:43px}.brand-sub{display:none}.module-grid{grid-template-columns:repeat(2,1fr)}.lesson-grid{grid-template-columns:170px minmax(0,1fr);gap:22px}.chapter-rail{padding-right:15px}.lesson-title h1{font-size:32px}.path-strip b{font-size:10px}.simulation-top>span:last-child{display:none}}@media(max-width:740px){header{padding:20px}.brand{font-size:21px}nav{gap:15px}nav button{font-size:10px}nav button:nth-child(2),.edition{display:none}main{padding:30px 20px 45px}.hero{grid-template-columns:1fr;padding-top:0;gap:30px}.hero h1{font-size:43px}.hero .eyebrow{font-size:8px}.hero-meta{font-size:8px}.hero-buttons{gap:15px}.hero-buttons .primary{font-size:10px;gap:15px}.path-strip{align-items:start;padding:20px 0;margin-bottom:30px;gap:9px}.path-strip>div{display:block;flex:1}.path-strip span{margin-bottom:9px;width:27px;height:27px;font-size:10px}.path-strip b{font-size:10px;line-height:1.6;display:block}.path-strip i{margin-top:7px}.section-heading{display:block}.section-heading h2{font-size:27px}.completion{display:block;margin-top:15px;text-align:left}.filters{gap:6px}.filters button{font-size:10px;padding:8px 10px}.module-grid{grid-template-columns:1fr}.module-card{min-height:250px}.module-full{min-height:0}.editorial{align-items:start;gap:18px}.editorial h3{font-size:18px}.editorial p{font-size:11px}footer{flex-wrap:wrap;padding:22px 20px;gap:15px;font-size:9px}footer>span{width:100%;line-height:1.8}footer a{margin-left:auto}.lesson-top{flex-wrap:wrap;gap:10px;margin-bottom:18px}.lesson-label{display:none}.lesson-top>.badge{margin-left:auto;font-size:7px}.lesson-title{display:block;margin-bottom:22px}.lesson-title h1{font-size:31px}.lesson-title .secondary{margin-top:18px;font-size:10px}.lesson-grid{grid-template-columns:1fr;gap:20px}.chapter-rail{padding-right:0;border:0;display:flex;gap:5px;overflow:auto}.chapter-rail>.small-label,.context-card{display:none}.chapter-rail>button{display:block;flex:1;min-width:68px;text-align:center;padding:9px 5px;border:1px solid var(--line);margin:0}.chapter-rail>button>span{display:block;font-size:9px;margin-bottom:7px}.chapter-rail>button>b{font-size:8px;line-height:1.4;display:block}.story-heading h2{font-size:23px}.story-heading p{font-size:12px}.simulation-top{padding:12px;font-size:7px}.simulation-result{padding:14px;gap:10px}.simulation-result b{font-size:12px}.simulation-result p{font-size:10px}.simulation-result>span{font-size:24px;width:23px}.control-grid{grid-template-columns:1fr;gap:12px}.experiment-panel{padding:17px}.experiment-heading{display:block}.experiment-heading>.fine{display:block;margin-top:5px}fieldset{padding:15px}.story-navigation{gap:10px}.story-navigation .primary{font-size:10px;padding:11px 13px;gap:8px}.story-navigation .secondary{font-size:10px;padding:10px 12px}.learning-grid{grid-template-columns:1fr}.knowledge-check{padding:17px}.knowledge-check h3{font-size:17px}.answer-options button{font-size:11px}.takeaway p{font-size:13px}.flow-scene{min-height:170px}dialog{padding:26px}dialog h2{font-size:25px}.hero-art{border-radius:8px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;scroll-behavior:auto!important}.moving-packet{display:none}}@media print{header,footer,.chapter-rail,.story-navigation,.source-note,.filters,.hero-buttons{display:none}.lesson-grid{display:block}body{background:white;color:black}p{color:#333}.simulation{break-inside:avoid}.learning-grid{display:block}.learning-grid article{background:white;color:black}.takeaway p{color:black}}