:root{color-scheme:dark;font-family:'Segoe UI',system-ui,sans-serif;background:#080d17;color:#edf3ff;--accent:#76edda;--muted:#aabbd1}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 65% 0,#19334c66,transparent 65%),#080d17;min-height:100vh}header{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:22px 38px;border-bottom:1px solid #233147}.brand{font-size:20px;font-weight:700;letter-spacing:-.5px;color:#edf3ff;text-decoration:none}.demo-label{font:10px/1.5 Consolas,monospace;color:var(--accent);letter-spacing:.8px}.layout{display:grid;grid-template-columns:minmax(0,1fr) 438px;gap:70px;max-width:1100px;margin:0 auto;padding:34px 30px 24px}.instruction{align-self:center;padding-bottom:26px}.eyebrow{font:11px/1.5 Consolas,monospace;color:var(--accent);letter-spacing:1.5px}progress{display:block;width:150px;height:4px;accent-color:var(--accent);margin:15px 0 28px}progress::-webkit-progress-bar{background:#26364e;border-radius:10px}progress::-webkit-progress-value{background:var(--accent);border-radius:10px}h1{font-size:39px;font-weight:650;letter-spacing:-1.5px;line-height:1.12;margin:0 0 16px}.copy{font-size:17px;line-height:1.65;color:var(--muted);margin:0;max-width:440px}.direction{font-size:13px;color:#ffa7ba;margin:24px 0}.navigation{display:flex;gap:10px;margin:24px 0 0}button{font:600 13px/1.4 'Segoe UI',sans-serif;padding:11px 16px;border-radius:7px;border:1px solid #35465f;background:#152135;color:#d9e5f6;cursor:pointer;min-height:42px}button:hover{border-color:var(--accent)}button.next{background:var(--accent);border-color:var(--accent);color:#092521}button:disabled{opacity:.3;cursor:default}.example{padding:8px;background:#0d1421;border:1px solid #2b3e56;border-radius:13px;box-shadow:0 22px 65px #0005;min-width:0;align-self:start}.example-label{font:10px/1.4 Consolas,monospace;color:#a6bbd3;letter-spacing:.7px;padding:3px 8px;margin:0 0 8px}iframe{display:block;width:420px;max-width:100%;height:590px;border:0;border-radius:7px;background:#090c14}.help{margin-top:32px;border-top:1px solid #233147;padding-top:15px}.help summary{cursor:pointer;font-size:12px;color:var(--muted)}.help p{font-size:12px;line-height:1.7;color:var(--muted)}.help-actions{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}.help-actions button{font-size:12px}a{color:var(--accent)}.finished{max-width:720px;margin:90px auto;padding:0 28px}.finished p{color:var(--muted);font-size:16px;line-height:1.7}.finished .eyebrow{color:var(--accent);font-size:11px}.finished .fine{font-size:12px;margin-top:35px}[hidden]{display:none!important}:focus-visible{outline:2px solid var(--accent);outline-offset:4px}@media(max-width:900px){header{padding:18px 22px}.layout{grid-template-columns:1fr;max-width:560px;gap:24px;padding:25px 20px}.instruction{padding:0}h1{font-size:32px}.copy{font-size:16px}.example{width:438px;max-width:100%;justify-self:center}.help{margin-top:18px}.navigation{margin-top:16px}.direction{margin:15px 0}.demo-label{font-size:9px;max-width:175px;text-align:right}progress{margin-bottom:20px}.finished{margin-top:45px}}@media(max-width:420px){.layout{padding:22px 12px;gap:20px}header{padding:16px 14px}.brand{font-size:17px}.demo-label{max-width:140px;font-size:8px}h1{font-size:29px}.copy{font-size:15px}.example{padding:5px}.example-label{font-size:9px}iframe{height:590px}}