:root{--ink:#182b31;--teal:#145e54;--paper:#f6f5ed;--line:#d6ded5;--gold:#efbd69}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 system-ui,sans-serif}a{color:var(--teal)}button,a{touch-action:manipulation}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #cf8739;outline-offset:4px}header{max-width:1120px;margin:auto;padding:25px 24px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);gap:15px}.brand{font:12px monospace;letter-spacing:.08em;text-decoration:none;color:var(--ink)}header div{display:flex;gap:20px;align-items:center}header button,#restart{border:1px solid var(--line);background:transparent;border-radius:8px;padding:7px 14px}main{max-width:1120px;margin:auto;padding:0 24px}.intro{max-width:750px;padding:48px 0 24px}.eyebrow{font:11px/1.5 monospace;letter-spacing:.12em;color:var(--teal)}h1{font-size:clamp(36px,5vw,60px);line-height:1.08;letter-spacing:-.055em;font-weight:550;margin:18px 0}h1 em{font-style:normal;color:var(--teal)}.intro>p:not(.eyebrow){color:#52676c;max-width:600px}.meta{display:flex;justify-content:space-between;font-size:12px;margin:25px 0 8px}#counter{font-family:monospace}progress{width:100%;height:7px;border:0;border-radius:8px;overflow:hidden;accent-color:var(--teal)}progress::-webkit-progress-bar{background:#dce3d9}progress::-webkit-progress-value{background:var(--teal)}.missions{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:14px 0 25px}.missions button{min-height:82px;padding:13px;text-align:left;border:1px solid var(--line);background:#fff9;border-radius:10px;color:var(--ink);font-size:13px}.missions button span{font:11px monospace;display:block;margin-bottom:6px;color:var(--teal)}.missions button[aria-current=step]{background:var(--teal);color:white;border-color:var(--teal)}.missions button[aria-current=step] span{color:#c8eee0}.missions button.done:after{content:' ✓';color:#d49132;font-weight:bold}.workbench{display:grid;grid-template-columns:1.1fr 1fr;min-height:430px;border-radius:16px;overflow:hidden;border:1px solid var(--line);box-shadow:0 15px 45px #193c3010}.mission-copy{padding:32px;background:#172a31;color:#eff3ec;min-width:0}.mission-copy .eyebrow{color:var(--gold)}h2{font-size:28px;line-height:1.2;letter-spacing:-.025em;margin:10px 0 20px}.mission-copy>p:not(.eyebrow){font-size:14px;color:#bdd0d2}.answer-panel{padding:32px;background:#fffdf7;min-width:0}h3{font-size:20px;line-height:1.4;font-weight:550;margin:12px 0 22px}.record{border:1px solid #48606a;border-radius:9px;padding:12px;margin:8px 0;display:flex;justify-content:space-between;gap:15px;font-size:12px}.record code{color:var(--gold);white-space:nowrap}.record span{overflow-wrap:anywhere}.record.origin{border-color:#8dbeaf}.answer{display:block;width:100%;text-align:left;padding:14px 16px;border:1px solid #cbd8cd;border-radius:9px;background:white;color:var(--ink);font-size:14px;margin:9px 0;min-height:52px}.answer:hover{border-color:var(--teal);background:#edf3eb}.answer.correct{border:2px solid var(--teal);background:#e1efe1}.answer.retry{border-color:#b5843b;background:#fff2dd}.answer:disabled{cursor:default}.primary{display:inline-block;border:0;border-radius:8px;padding:12px 18px;background:var(--teal);color:white;text-decoration:none;font:14px system-ui,sans-serif}.primary[hidden]{display:none}#feedback{font-size:14px;min-height:40px;color:#52676c}#feedback.success{color:var(--teal)}details{font-size:12px;margin-top:22px}summary{cursor:pointer;color:#d6e8e1}#sources{overflow-wrap:anywhere}#sources a{color:#c7e6d8}#sources p{margin:8px 0;font-size:11px}pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:11px;max-height:200px;overflow:auto}#experiment button{background:#e4ede3;color:var(--ink);border:0;padding:9px 12px;margin:8px 8px 0 0;border-radius:6px;font-size:12px}#experiment-output{font:12px/1.5 monospace;color:var(--gold);margin-top:12px;overflow-wrap:anywhere}#finish{margin:28px 0;padding:30px;border-radius:14px;background:#e5edde;border:1px solid #bed0bd}#finish .primary{margin-right:12px}footer{padding:25px 0 40px;font-size:11px;color:#617175;max-width:860px}#revision{font:10px monospace;overflow-wrap:anywhere}@media(max-width:750px){.workbench{grid-template-columns:1fr}.missions{gap:6px}.missions button{padding:9px;font-size:11px}.mission-copy,.answer-panel{padding:23px}.intro{padding-top:30px}header{padding:18px}.brand{font-size:10px}main{padding:0 18px}}@media(max-width:420px){.missions{grid-template-columns:repeat(3,1fr)}.missions button{min-height:64px}.record{flex-wrap:wrap;gap:4px}.meta{gap:15px}header div{gap:10px}header a{font-size:12px}}