:root{color-scheme:dark;--bg:#0e0b14;--panel:#1d1925;--panel2:#2a2035;--border:#44394f;--text:#f5eff9;--muted:#b5a9bf;--accent:#a64de1}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 system-ui,-apple-system,sans-serif}a{color:#d9a8ff}button,input{font:inherit}button{cursor:pointer}header{background:#1b1722;border-bottom:1px solid var(--border);padding:18px max(20px,calc((100vw - 1100px)/2));display:flex;align-items:center;justify-content:space-between;gap:16px;position:sticky;top:0;z-index:2}.brand{font-size:22px;font-weight:800}.brand span{display:inline-grid;place-items:center;background:linear-gradient(135deg,#ddacff,#8940c5);color:#170c22;width:37px;height:37px;border-radius:12px;margin-right:10px}.back{font-size:14px;text-decoration:none;border:1px solid var(--border);padding:8px 12px;border-radius:12px;color:var(--text)}main{max-width:1100px;margin:auto;padding:34px 20px 90px}.eyebrow{font-size:12px;letter-spacing:3px;font-weight:800;color:#d5a9ee}h1{font-size:clamp(34px,6vw,54px);line-height:1.12;font-weight:600;letter-spacing:-2px;margin:10px 0}h2{line-height:1.2}p{color:var(--muted)}.hero{margin-bottom:30px}.meter{height:9px;background:#2b2433;border-radius:20px;overflow:hidden;margin:14px 0}.meter div{height:100%;width:0;background:linear-gradient(90deg,#8034bd,#ca77fa);transition:width .2s}.layout{display:grid;grid-template-columns:300px 1fr;gap:22px}.sidebar,.lesson{background:var(--panel);border:1px solid var(--border);border-radius:24px;padding:22px}.sidebar{align-self:start}.search{width:100%;background:#110e18;border:1px solid var(--border);color:var(--text);padding:13px;border-radius:12px;margin-bottom:12px}.lesson-link{display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:transparent;border:1px solid transparent;color:var(--muted);padding:12px;border-radius:12px;margin:4px 0}.lesson-link.active{background:var(--panel2);color:var(--text);border-color:#80529e}.lesson-link .num{width:27px;height:27px;flex-shrink:0;display:grid;place-items:center;border-radius:50%;background:#3a2b47;font-size:12px}.lesson-link.done .num{background:#4d825e;color:#fff}.lesson h2{font-size:32px;margin:0 0 10px}.lesson h3{margin-top:28px}.step{background:#16121d;border:1px solid #383041;border-radius:16px;padding:16px 18px;margin:12px 0}.step b{color:#eed6ff}.callout{border-left:4px solid var(--accent);background:#281d33;padding:15px 18px;border-radius:0 12px 12px 0;margin:24px 0}.callout p{margin:0}.screen-shot{display:block;width:100%;max-width:430px;height:auto;border:1px solid #574266;border-radius:20px;margin:24px 0}.mock{background:#100e17;border:1px solid #574266;border-radius:20px;padding:16px;margin:24px 0;max-width:430px}.mock-label{font-size:11px;letter-spacing:2px;color:#d9a8ff;font-weight:800;margin-bottom:8px}.mock-card{background:#211b2b;border:1px solid #4a3a55;border-radius:13px;padding:14px;margin:9px 0}.mock-row{display:flex;justify-content:space-between;gap:8px;align-items:center}.mock-pill{background:#4d2b66;border-radius:9px;padding:7px 12px;font-size:13px;color:#f2e4ff}.mock-small{color:#b4a8bd;font-size:13px}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.primary,.secondary{border:0;border-radius:12px;padding:13px 18px;font-weight:700}.primary{background:linear-gradient(110deg,#8340b5,#ad52e5);color:white}.secondary{background:#30253a;color:var(--text)}.check{display:flex;gap:12px;align-items:center;padding:14px 0;border-top:1px solid var(--border);font-weight:600}.check input{accent-color:var(--accent);width:21px;height:21px}.quiz{background:#15111b;padding:18px;border-radius:16px;border:1px solid var(--border);margin-top:24px}.quiz button{display:block;width:100%;text-align:left;background:#292135;border:1px solid #50405c;border-radius:10px;padding:11px;color:var(--text);margin-top:8px}.quiz button.correct{border-color:#83d69b;background:#20382b}.quiz button.wrong{border-color:#ff9292;background:#41252c}.feedback{min-height:25px;margin-top:8px;font-size:14px}.muted{color:var(--muted)}.hidden{display:none!important}@media(max-width:750px){header{padding:12px 16px}.brand{font-size:18px}.back{font-size:12px}main{padding:22px 14px 90px}.layout{display:block}.sidebar{margin-bottom:18px;padding:14px}.lesson{padding:20px 16px}.lesson h2{font-size:27px}.sidebar-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px}.lesson-link{font-size:12px;padding:9px;line-height:1.3}.lesson-link .num{width:23px;height:23px}.hero{margin-bottom:20px}}

.brand-sub{font-weight:400;color:#b7a8c4}.reset-btn{font-size:12px;padding:7px 10px}.learning-figure{margin:24px 0}.learning-caption{font-size:12px}

.walkthrough-action{margin-top:9px}.walkthrough-link{display:inline-flex;align-items:center;gap:7px;border:1px solid #7c568e;border-radius:9px;padding:7px 11px;color:#e3b9ff;background:rgba(166,77,225,.1);font-size:14px;font-weight:700;text-decoration:none}.walkthrough-link:hover,.walkthrough-link:focus-visible{background:rgba(166,77,225,.24);border-color:#c18ae7;text-decoration:underline}.walkthrough-link:focus-visible{outline:2px solid #d9a8ff;outline-offset:3px}