:root{color-scheme:light;--paper:#f6efe4;--ink:#2c2620;--copper:#b3562a;--copper-edge:#8f3f1c;--line:#ddd2bf;--sage:#4f7a56;--brick:#a6352e;--tunnel:#476b7a}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.5 system-ui,-apple-system,sans-serif}main{width:min(1160px,100% - 48px);margin:auto;padding:42px 0 30px}header{display:flex;align-items:end;justify-content:space-between;gap:30px;border-bottom:2px solid var(--ink);padding-bottom:24px;margin-bottom:24px}h1{font:600 clamp(40px,6vw,72px)/.95 Georgia,serif;letter-spacing:-3px;margin:0}h1 span{color:var(--copper)}header p{max-width:290px;margin:0}h2,h3{margin:0 0 12px;font-family:Georgia,serif;line-height:1.18}h2{font-size:27px}p{margin:0 0 18px}button,summary,a{touch-action:manipulation}button{font:600 16px/1.2 system-ui;min-height:48px;border:1px solid var(--line);border-radius:10px;background:transparent;color:inherit;padding:12px 18px;cursor:pointer;transition:transform .16s}button:hover{background:#ece2cf}button:active{transform:scale(.96)}button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #227b9d;outline-offset:4px}button:disabled{opacity:.42;cursor:default;transform:none}.lab{display:grid;grid-template-columns:1fr 1.05fr;gap:48px}.trace{min-width:0}.trace-heading{display:flex;align-items:start;justify-content:space-between;gap:10px}#progress{white-space:nowrap;font:600 14px system-ui;padding-top:6px}#ticket{border-left:4px solid var(--copper);background:#efe3cc;padding:14px 12px;margin:20px 0;font:14px/1.5 ui-monospace,monospace;overflow-wrap:anywhere;min-height:48px}.save-notice{font:600 12px system-ui;color:#6d6255;margin:-10px 0 16px}.actions{display:flex;gap:12px}.primary{background:var(--copper);border-color:var(--copper-edge);color:white;box-shadow:0 4px 0 var(--copper-edge)}.primary:hover{background:#c66535}.quiet{border:0;text-decoration:underline}.explanation{min-width:0;padding-left:30px;border-left:1px solid var(--line)}.explanation>p{max-width:55ch;min-height:80px}.choices{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0 18px}.choices button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:white}#verdict{min-height:0;color:var(--sage);font-weight:600}#verdict[data-correct=false]{color:var(--brick)}#verdict:empty{display:none}#diagram{margin:24px 0;padding:20px 0;border-block:1px solid var(--line)}#diagram svg{width:100%;height:auto;display:block}.building{fill:#fbf7ec;stroke:var(--ink);stroke-width:2}.addressbar{fill:#e5dbc6;stroke:none}.pageline{stroke:var(--sage);stroke-width:3;stroke-linecap:round;fill:none}.station-label{font:600 12px system-ui;fill:var(--ink)}.hop{fill:none;stroke:var(--tunnel);stroke-width:2}.hop.reply{stroke:var(--sage)}.hop.faint-hop{stroke:var(--line)}.hop-label{font:600 11px ui-monospace,monospace;fill:var(--tunnel)}.env-body{fill:#fffdf6;stroke:var(--copper);stroke-width:2}.env-flap{fill:none;stroke:var(--copper);stroke-width:1.6}.env-mark{font:700 10px ui-monospace,monospace;fill:var(--copper)}.lock rect{fill:var(--tunnel)}.lock path{fill:none;stroke:var(--tunnel);stroke-width:2}.lock.big rect{fill:var(--tunnel)}.slip-body{fill:#efe3cc;stroke:var(--line)}.slip-text{font:600 9.5px ui-monospace,monospace;fill:var(--ink)}.slip.faint{opacity:.55}.question{font:700 13px ui-monospace,monospace;fill:var(--copper)}.caption{font:600 12px system-ui;fill:#6d6255}.faint-text{font:600 11px system-ui;fill:#a99c89}.url-text{font:600 14px ui-monospace,monospace;fill:var(--ink)}.road{fill:none;stroke:var(--line);stroke-width:2;stroke-dasharray:5 6}.road.faint{stroke:#e4dac7}.wall{stroke:var(--brick);stroke-width:3;stroke-dasharray:6 6}.tube rect{fill:#dce7ea;stroke:var(--tunnel);stroke-width:2}.cross{stroke:var(--brick);stroke-width:3;stroke-linecap:round}.crack{fill:none;stroke:var(--brick);stroke-width:3;stroke-linejoin:round}.door.unwell .building{fill:#f0e9db;stroke:#b3a892}.door.unwell .station-label{fill:var(--brick)}.stage-label{font:600 11px system-ui;fill:var(--ink)}.noise{font:700 13px ui-monospace,monospace;fill:#a99c89}footer{margin-top:32px}.reference{border-bottom:0}.reference>summary{display:inline-block;min-height:44px;padding:10px 16px;border:1px solid var(--line);border-radius:10px}details{border-bottom:1px solid var(--line)}summary{padding:18px 0;cursor:pointer;font-weight:600;min-height:48px}details p{max-width:78ch}#sources{display:grid;gap:12px;padding-bottom:20px}a{color:var(--sage);font-weight:600;min-height:44px;display:inline-flex;align-items:center}#predictionQuestion{font-weight:600}button[data-answer]{min-width:125px}[hidden]{display:none!important}@media(max-width:750px){main{width:calc(100% - 32px);padding-top:28px}header{display:block;margin-bottom:18px;padding-bottom:20px}h1{letter-spacing:-2px}header p{margin-top:14px;max-width:100%;font-size:16px}.lab{grid-template-columns:1fr;gap:28px}.explanation{padding:0;border:0}.trace-heading h2{font-size:25px}#ticket{margin:12px 0 18px}.primary{flex:1}.explanation>p{min-height:0}#diagram{margin:20px 0}footer{margin-top:25px}}@media(orientation:landscape) and (max-height:500px){main{padding-top:18px}.lab{grid-template-columns:1fr 1fr;gap:25px}header{display:flex}header p{max-width:290px}h1{font-size:44px}.explanation{padding-left:20px;border-left:1px solid var(--line)}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
