:root{color-scheme:light dark;--page:#f3f1eb;--surface:#fffefa;--surface-2:#eeece5;--ink:#18201d;--muted:#66706b;--line:#b8b9b2;--accent:#166b55;--accent-soft:#dcebe4;--blocked:#a42d36;--inactive:#818984}*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--ink);font:14px/1.45 system-ui,sans-serif;user-select:text}button{font:inherit}main{width:min(1420px,calc(100% - 24px));margin:auto;padding:18px 0 36px}.access-state{margin:20vh auto;max-width:480px;text-align:center;color:var(--muted)}.lesson-head{display:flex;align-items:end;justify-content:space-between;gap:28px;margin-bottom:12px}.lesson-head>p{max-width:570px;margin:0;color:var(--muted)}.eyebrow{margin:0;color:var(--muted);font:700 11px/1.2 ui-monospace,monospace;text-transform:uppercase;letter-spacing:.09em}h1{max-width:720px;margin:3px 0 0;font-size:clamp(25px,4vw,42px);line-height:1.04;letter-spacing:-.04em}h2{margin:0;font-size:16px}.scenario-tabs{display:flex;overflow:auto;border:1px solid var(--line);background:var(--surface)}.scenario-tabs button{min-width:max-content;flex:1;border:0;border-right:1px solid var(--line);padding:9px 13px;background:transparent;color:var(--ink);cursor:pointer;font-weight:700}.scenario-tabs button:last-child{border-right:0}.scenario-tabs button[aria-pressed="true"]{background:var(--accent);color:#fff}.scenario-tabs button:focus-visible,.node:focus-visible{outline:3px solid #e7952d;outline-offset:2px}.runtime,.meaning,.boundary{margin-top:12px;border:1px solid var(--line);background:var(--surface);padding:14px}.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:20px}.section-head p{margin:0;color:var(--muted)}.path{display:grid;grid-template-columns:repeat(9,minmax(36px,1fr));align-items:center;gap:8px;min-height:250px;margin-top:10px;padding:20px;border:1px solid var(--line);background:linear-gradient(90deg,var(--surface-2),var(--surface))}.node{min-width:0;padding:14px 10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);overflow-wrap:anywhere;text-align:center;cursor:pointer}.node strong,.node small{display:block}.node small{margin-top:3px;color:var(--muted)}.node.active{border-color:var(--accent);box-shadow:inset 0 0 0 2px var(--accent)}.node.skipped{border-style:dashed;color:var(--inactive);background:var(--surface-2)}.node.blocked{border-color:var(--blocked);color:var(--blocked)}.edge{height:2px;background:var(--accent);position:relative}.edge::after{content:"";position:absolute;right:-2px;top:-4px;border:5px solid transparent;border-left-color:var(--accent)}.edge.skipped{background:var(--inactive)}.edge.skipped::after{border-left-color:var(--inactive)}.detail{min-height:86px;margin-top:10px;padding:11px 13px;border-left:4px solid var(--accent);background:var(--accent-soft)}.detail h3{margin:0 0 3px}.detail p{margin:0}.definitions{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin-top:10px}.definitions article{padding:10px;border-top:3px solid var(--accent);background:var(--surface-2)}.definitions h3{margin:0 0 4px;font-size:14px}.definitions p{margin:0;color:var(--muted)}.table-scroll{overflow:auto;margin-top:10px;border:1px solid var(--line)}table{width:100%;border-collapse:collapse}th,td{padding:9px 11px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);text-align:left;vertical-align:top}thead th{background:var(--surface-2);color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.05em}tbody th{min-width:180px}.conclusion{margin:12px 0 0;padding:10px 12px;background:var(--accent-soft)}.sources{padding:13px 3px 0;color:var(--muted);font-size:12px}.sources a{color:var(--accent)}@media(max-width:900px){.definitions{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-head{align-items:start;flex-direction:column;gap:6px}.section-head{align-items:start;flex-direction:column;gap:3px}}@media(max-width:680px){main{width:calc(100% - 14px);padding-top:8px}.path{display:flex;min-height:0;flex-direction:column;align-items:stretch}.edge{width:2px;height:22px;align-self:center}.edge::after{right:-4px;top:auto;bottom:-5px;border-left-color:transparent;border-top-color:var(--accent)}.edge.skipped::after{border-left-color:transparent;border-top-color:var(--inactive)}.definitions{grid-template-columns:1fr}}
@media(prefers-color-scheme:dark){:root{--page:#101512;--surface:#19211c;--surface-2:#222c26;--ink:#edf3ef;--muted:#aeb9b2;--line:#5b685f;--accent:#83d0aa;--accent-soft:#213a2e;--blocked:#ffaaa7;--inactive:#9ba59f}.scenario-tabs button[aria-pressed="true"]{color:#102018}}