:root{color-scheme:dark;--bg:#141619;--panel:#1c1f23;--panel2:#22262b;--line:#343940;--text:#f2f0e9;--muted:#b0b6bf;--accent:#f5a48f;--ok:#a3d5b0;--bad:#ffaaa5;--r:14px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:15px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.6}a{color:inherit;text-decoration-thickness:1px;text-underline-offset:4px}button,input,textarea,select{font:inherit}button,a.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:43px;padding:10px 16px;border:1px solid var(--line);border-radius:9px;background:var(--panel2);color:var(--text);cursor:pointer;font-weight:650;text-decoration:none}button:hover,a.button:hover{border-color:var(--muted)}button:disabled{cursor:not-allowed;opacity:.45}button.primary,a.primary{background:var(--accent);color:#211712;border-color:var(--accent)}button.quiet{background:transparent}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.topbar{height:86px;padding:0 34px;display:flex;align-items:center;gap:28px;border-bottom:1px solid var(--line);background:#141619;position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:210px}.brand b{background:var(--accent);color:#211712;border-radius:10px;padding:6px 10px;font-size:25px;letter-spacing:-2px}.brand span{font-weight:750;font-size:12px;letter-spacing:2px}.brand small{display:block;font-size:9px;color:var(--muted);letter-spacing:1.5px;font-weight:500}.topbar nav{display:flex;gap:8px;flex:1}.topbar nav button{background:none;border-color:transparent;color:var(--muted)}.topbar nav button.active{background:var(--panel2);color:var(--text)}.layout{display:grid;grid-template-columns:268px minmax(0,1fr);max-width:1680px;margin:auto}.sidebar{padding:28px 18px;border-right:1px solid var(--line);min-height:calc(100vh - 86px);position:sticky;top:86px;align-self:start;max-height:calc(100vh - 86px);overflow:auto}.sidehead{display:flex;align-items:center;justify-content:space-between;padding:0 10px 20px;font-size:11px;color:var(--muted)}.eyebrow{color:var(--accent);letter-spacing:2px;font-size:11px;font-weight:750}.unit-link{display:flex;align-items:center;gap:12px;width:100%;background:transparent;border:1px solid transparent;text-align:left;justify-content:flex-start;margin:3px 0;padding:11px 10px}.unit-link .num{font-size:12px;color:var(--muted);min-width:23px;font-weight:400}.unit-link .unitname{flex:1;font-size:13px;line-height:1.4}.unit-link .unitdone{color:var(--ok)}.unit-link.active{background:var(--panel2);border-color:var(--line)}.unit-link.active .num{color:var(--accent)}.sidefoot{margin:25px 10px 0;padding-top:22px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.sidefoot b{color:var(--text)}main{padding:22px 42px 70px;min-width:0}.save-status{font-size:11px;letter-spacing:.4px;color:var(--muted);text-align:right;min-height:26px}.hero{display:flex;align-items:flex-start;justify-content:space-between;gap:30px;margin:28px 0}.hero h1{font-size:clamp(32px,4vw,52px);line-height:1.1;letter-spacing:-1.8px;margin:12px 0 16px}.hero p{color:var(--muted);max-width:580px;margin:0;font-size:16px}.hero .edition{border:1px solid var(--line);border-radius:50%;width:94px;height:94px;min-width:94px;display:grid;place-content:center;text-align:center;color:var(--accent);font-size:24px;margin-top:16px}.edition small{font-size:10px;letter-spacing:1px;color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:26px 0}.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px}.stat strong{font-size:26px;display:block;line-height:1.2}.stat span{font-size:11px;color:var(--muted)}.progress-track{height:5px;background:var(--panel2);border-radius:9px;overflow:hidden;margin:6px 0 22px}.progress-track i{height:100%;display:block;background:var(--accent)}.section-head{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:30px 0 14px}.section-head h2{font-size:20px;margin:0;letter-spacing:-.5px}.section-head p{margin:3px 0 0;color:var(--muted);font-size:12px}.actions{display:flex;align-items:center;flex-wrap:wrap;gap:9px}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 22px;padding-bottom:16px;border-bottom:1px solid var(--line)}.tabs button{background:transparent;color:var(--muted);border-color:transparent}.tabs button.active{color:var(--text);background:var(--panel2);border-color:var(--line)}.card{padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r);margin:14px 0}.card h2,.card h3{margin:0 0 10px;line-height:1.3}.card p{color:var(--muted);margin:10px 0}.theory-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.theory-grid .card{margin:0}.theory-grid h3{font-size:17px}.tag{display:inline-flex;font-size:10px;letter-spacing:1px;text-transform:uppercase;border:1px solid var(--line);border-radius:5px;padding:3px 7px;color:var(--muted);line-height:1.5}.tag.ok{color:var(--ok);border-color:#42624c}.tag.warn{color:var(--accent);border-color:#795146}.tag.fail{color:var(--bad);border-color:#855351}.small,.muted{color:var(--muted);font-size:12px}.notice{border-left:3px solid var(--accent);padding:12px 16px;background:var(--panel2);border-radius:0 8px 8px 0;font-size:13px;color:var(--muted);margin:15px 0}.task-list{display:grid;grid-template-columns:1fr 1fr;gap:12px}.task-card{padding:20px;margin:0;display:flex;flex-direction:column;align-items:flex-start}.task-card h3{font-size:17px;margin:13px 0 4px}.task-card p{font-size:13px;flex:1}.task-card .taskmeta{display:flex;gap:7px;flex-wrap:wrap}.task-card button{margin-top:10px;width:100%}.workspace{display:grid;grid-template-columns:minmax(250px,.9fr) minmax(330px,1.1fr);gap:20px;align-items:start}.workspace .card{margin:0 0 14px;padding:21px}.workspace h2{font-size:24px}.requirements{padding-left:19px;color:var(--muted);font-size:13px}.requirements li{margin:10px 0}.requirements li::marker{color:var(--accent)}pre,code{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace}pre{background:#101215;color:#dce0e5;padding:15px;border:1px solid var(--line);border-radius:8px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;font-size:12px;line-height:1.7}code{font-size:.88em}textarea.code{width:100%;min-height:360px;resize:vertical;background:#101215;color:#e9e8e2;font:13px/1.75 "SFMono-Regular",Consolas,monospace;tab-size:4;border:1px solid var(--line);padding:16px;border-radius:9px;white-space:pre;overflow-wrap:normal}textarea.notes{min-height:120px}textarea,input,select{background:#101215;color:var(--text);border:1px solid var(--line);border-radius:7px;padding:11px 12px;width:100%}label{display:block;font-size:12px;color:var(--muted);margin:12px 0 6px}.editor-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;font-size:12px}.editor-top span{color:var(--muted)}.checkline{display:flex;align-items:flex-start;gap:10px;cursor:pointer;margin:12px 0;line-height:1.6}.checkline input{width:17px;min-width:17px;margin:4px 0}.result-row{border-top:1px solid var(--line);padding:13px 0}.result-row:first-child{border-top:0}.result-row strong{font-size:13px}.result-row pre{max-height:170px;overflow:auto}.good{color:var(--ok)}.error{color:var(--bad)}fieldset{border:0;padding:0;margin:0 0 20px;min-width:0}legend{font-size:16px;font-weight:650;line-height:1.5;padding:0;margin:0 0 12px;white-space:pre-wrap}.option{display:flex;align-items:flex-start;gap:12px;padding:11px 14px;border:1px solid var(--line);border-radius:8px;background:var(--panel2);cursor:pointer;font-size:13px;color:var(--text);margin:7px 0}.option input{width:17px;min-width:17px;margin-top:3px}.option.selected{border-color:var(--accent)}.quiz-feedback{padding:12px;border-radius:7px;background:var(--panel2);font-size:13px}.timeline{border-left:1px solid var(--line);margin-left:8px;padding-left:24px}.event{margin:22px 0;position:relative}.event:before{position:absolute;content:"";left:-30px;top:8px;width:10px;height:10px;border:2px solid var(--bg);background:var(--accent);border-radius:50%}.event h3{font-size:14px;margin:0}.event p{font-size:12px;color:var(--muted);margin:5px 0}.skill-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.skill-grid .card{margin:0}.skill-row{display:flex;justify-content:space-between;gap:10px;padding:10px 0;border-bottom:1px solid var(--line);font-size:12px}.skill-row:last-child{border:0}.skill-dots{letter-spacing:3px;color:var(--accent);white-space:nowrap}.setup-step{display:grid;grid-template-columns:40px 1fr;gap:15px}.setup-step .stepnum{font-size:26px;color:var(--accent)}details{margin:15px 0;font-size:12px}summary{cursor:pointer;color:var(--accent)}iframe.preview{width:100%;min-height:430px;border:1px solid var(--line);border-radius:9px;background:#fff;margin-top:15px}dialog{max-width:560px;width:calc(100vw - 32px);max-height:90vh;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:18px;padding:30px;overflow:auto}dialog::backdrop{background:#000a}.close{float:right;min-height:30px;padding:0 10px;font-size:22px}#loginForm button{margin-top:18px}.skip{position:absolute;top:-100px;left:15px;z-index:30;background:var(--accent);color:#111;padding:10px}.skip:focus{top:10px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--text);color:#141619;padding:13px 22px;border-radius:10px;font-size:13px;z-index:30;max-width:90vw;box-shadow:0 10px 50px #0007}button.linkbtn{padding:0;min-height:30px;border:0;background:transparent;color:var(--accent);font-weight:500;text-decoration:underline;text-underline-offset:4px}h1,h2,h3{overflow-wrap:anywhere}.empty{padding:38px 25px;text-align:center;color:var(--muted)}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.print-only{display:none}[hidden]{display:none!important}@media(min-width:1400px){main{padding-left:56px;padding-right:56px}}@media(max-width:1100px){.layout{grid-template-columns:222px minmax(0,1fr)}main{padding:20px 25px 55px}.workspace{grid-template-columns:1fr}.brand{min-width:175px}.topbar{padding:0 22px}.hero .edition{display:none}}@media(max-width:760px){.topbar{height:auto;min-height:75px;padding:14px 16px;gap:10px;flex-wrap:wrap}.brand{min-width:0;flex:1}.topbar nav{order:3;flex-basis:100%;gap:6px}.topbar nav button{flex:1;padding:7px;min-height:37px}.layout{display:block}.sidebar{position:static;max-height:none;min-height:0;padding:14px 15px 8px;border-right:0;border-bottom:1px solid var(--line)}.sidehead{padding-bottom:6px}.sidefoot{display:none}#unitNav{display:flex;overflow:auto;gap:6px;padding-bottom:6px}.unit-link{min-width:145px;max-width:190px;flex-shrink:0;padding:10px}.unit-link .unitname{font-size:11px}.unit-link .num{min-width:17px}.unitdone{display:none}main{padding:14px 17px 45px}.save-status{text-align:left}.hero{margin:20px 0}.hero h1{font-size:36px}.hero p{font-size:14px}.stats{grid-template-columns:1fr 1fr;gap:9px;margin:20px 0}.stat{padding:14px}.stat strong{font-size:23px}.theory-grid,.task-list,.skill-grid{grid-template-columns:1fr}.section-head{align-items:flex-start;flex-direction:column}.card{padding:20px}.workspace .card{padding:18px}.tabs{gap:3px}.tabs button{font-size:12px;padding:8px 12px}.actions button,.actions a.button{font-size:12px}.workspace{display:block}textarea.code{font-size:13px;min-height:300px}.topbar{position:static}dialog{padding:22px}}@media print{.topbar,.sidebar,.save-status,.tabs,.actions,button,.progress-track{display:none!important}.layout,.workspace,.theory-grid,.task-list,.skill-grid{display:block}body{background:white;color:black}main{padding:0}.card{break-inside:avoid;border-color:#aaa;background:white;color:black}.card p,.requirements,.muted{color:#333}pre{background:#fff;color:#111;border-color:#aaa}.print-only{display:block}.hero h1{font-size:28px}}

/* Guided-course navigation also contains application links. */
@media(max-width:1150px){.topbar{height:auto;min-height:86px;flex-wrap:wrap;padding-top:12px;padding-bottom:12px}.topbar nav{flex-wrap:wrap;gap:4px}.topbar nav .button{font-size:12px;padding:8px 10px}}
@media(max-width:760px){.topbar nav .button,.topbar nav button{flex:1 1 auto;font-size:11px;min-height:34px}.topbar nav{order:3;flex-basis:100%}}