:root{--bg: #272d2a;--text: #fffcbd;--accent: #0000ff;--accent-light: #4444ff;--muted: #bebe8c;--surface: #343a36;--surface-border: #4a524d;--sidebar-width: 260px;--content-max-width: 800px;--radius: 8px;--radius-sm: 4px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:Inter,sans-serif;background:var(--bg);color:var(--muted);line-height:1.6;min-height:100vh}#app{display:flex;min-height:100vh}#sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-width);background:var(--surface);border-right:1px solid var(--surface-border);display:flex;flex-direction:column;z-index:100;overflow-y:auto}.sidebar-header{display:flex;align-items:center;gap:12px;padding:20px 20px 16px;border-bottom:1px solid var(--surface-border)}.logo-link{display:flex;align-items:center;text-decoration:none}.logo{width:36px;height:36px}.sidebar-title{font-size:.85rem;font-weight:600;color:var(--text);text-transform:uppercase;letter-spacing:.08em}.sidebar-nav{list-style:none;padding:12px 0;flex:1}.nav-link{display:flex;align-items:center;gap:10px;padding:10px 20px;color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:500;transition:background .15s,color .15s;border-left:3px solid transparent}.nav-link:hover{background:#fffcbd0d;color:var(--text)}.nav-link.active{color:var(--text);background:#fffcbd14;border-left-color:var(--accent-light)}.nav-icon{font-size:1rem;width:20px;text-align:center;flex-shrink:0}.progress-badge{margin-left:auto;font-size:.7rem;font-family:JetBrains Mono,monospace;background:#fffcbd14;color:var(--muted);padding:2px 8px;border-radius:10px;font-weight:500}.progress-badge.complete{background:#00f3;color:var(--accent-light)}#sidebar-toggle{display:none;position:fixed;top:12px;left:12px;z-index:200;background:var(--surface);border:1px solid var(--surface-border);color:var(--text);font-size:1.2rem;width:40px;height:40px;border-radius:var(--radius-sm);cursor:pointer;align-items:center;justify-content:center}#content{margin-left:var(--sidebar-width);flex:1;padding:40px 32px 80px;min-height:100vh}.content-inner{max-width:var(--content-max-width);margin:0 auto}h1,h2,h3,h4{color:var(--text);font-weight:700;line-height:1.3}h1{font-size:2rem;margin-bottom:8px}h2{font-size:1.5rem;margin-top:48px;margin-bottom:16px}h3{font-size:1.15rem;margin-top:32px;margin-bottom:12px}p{margin-bottom:12px}ul,ol{margin-bottom:12px;padding-left:24px}li{margin-bottom:6px}a{color:var(--accent-light);text-decoration:none}a:hover{text-decoration:underline}strong{color:var(--text);font-weight:600}.overview-header{text-align:center;padding:40px 0 32px}.overview-header h1{font-size:2.4rem;margin-bottom:12px}.overview-subtitle{font-size:1.1rem;color:var(--muted);max-width:520px;margin:0 auto}.block-cards{display:grid;gap:20px;margin:32px 0}.block-card{background:var(--surface);border:1px solid var(--surface-border);border-radius:var(--radius);padding:24px;cursor:pointer;transition:border-color .2s,transform .15s,box-shadow .2s;text-decoration:none;color:inherit;display:block}.block-card:hover{border-color:var(--accent-light);transform:translateY(-2px);box-shadow:0 4px 20px #0000ff1a;text-decoration:none}.block-card-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.block-card-number{font-family:JetBrains Mono,monospace;font-size:.75rem;color:var(--accent-light);text-transform:uppercase;letter-spacing:.05em}.block-card-time{font-size:.75rem;color:var(--muted);font-family:JetBrains Mono,monospace}.block-card h3{margin:4px 0 8px;font-size:1.2rem}.block-card p{font-size:.9rem;color:var(--muted);margin-bottom:12px}.block-card-footer{display:flex;align-items:center;justify-content:space-between}.block-card-exercises{font-size:.8rem;font-family:JetBrains Mono,monospace;color:var(--muted)}.block-card-progress{height:4px;background:var(--surface-border);border-radius:2px;flex:1;margin-left:16px;overflow:hidden}.block-card-progress-fill{height:100%;background:var(--accent-light);border-radius:2px;transition:width .3s ease}.prereq-note{background:var(--surface);border:1px solid var(--surface-border);border-left:3px solid var(--accent-light);border-radius:var(--radius);padding:16px 20px;margin-top:24px;font-size:.9rem}.prereq-note strong{display:block;margin-bottom:4px}.prereq-note code{background:#fffcbd14;padding:1px 6px;border-radius:var(--radius-sm);font-family:JetBrains Mono,monospace;font-size:.85em;color:var(--text)}.block-header{border-bottom:1px solid var(--surface-border);padding-bottom:20px;margin-bottom:32px}.block-meta{display:flex;align-items:center;gap:16px;font-size:.8rem;font-family:JetBrains Mono,monospace;color:var(--muted);margin-bottom:8px}.block-meta-tag{background:#0000ff26;color:var(--accent-light);padding:2px 10px;border-radius:10px}.block-header h1{font-size:1.8rem}.block-header .block-subtitle{color:var(--muted);font-size:1rem;margin-top:4px}.callout{border-radius:var(--radius);padding:16px 20px;margin:20px 0;font-size:.9rem}.callout-goal{background:#0000ff14;border:1px solid rgba(0,0,255,.2);border-left:3px solid var(--accent-light)}.callout-goal strong{color:var(--accent-light)}.callout-demo{background:#fffcbd0d;border:1px solid rgba(255,252,189,.12);border-left:3px solid var(--text);display:none}.presenter-mode .callout-demo{display:block}.callout-demo strong{color:var(--text)}.callout-tip{background:#bebe8c14;border:1px solid rgba(190,190,140,.15);border-left:3px solid var(--muted)}.exercise{background:var(--surface);border:1px solid var(--surface-border);border-radius:var(--radius);padding:24px;margin:24px 0}.exercise-header{display:flex;align-items:flex-start;gap:12px;margin-bottom:16px}.exercise-checkbox{position:relative;flex-shrink:0;margin-top:2px}.exercise-checkbox input[type=checkbox]{-moz-appearance:none;appearance:none;-webkit-appearance:none;width:22px;height:22px;border:2px solid var(--surface-border);border-radius:var(--radius-sm);background:transparent;cursor:pointer;transition:all .15s;display:block}.exercise-checkbox input[type=checkbox]:hover{border-color:var(--accent-light)}.exercise-checkbox input[type=checkbox]:checked{background:var(--accent);border-color:var(--accent-light)}.exercise-checkbox input[type=checkbox]:checked:after{content:"✓";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:var(--text);font-size:14px;font-weight:700}.exercise-title{flex:1}.exercise-title h3{margin:0;font-size:1.05rem}.exercise-time{font-size:.75rem;font-family:JetBrains Mono,monospace;color:var(--muted);margin-top:2px}.exercise-body{padding-left:34px}.exercise-body ul{list-style:disc}.exercise-body li{margin-bottom:8px;line-height:1.5}.checkpoint{display:flex;align-items:center;gap:8px;margin-top:14px;padding-top:12px;border-top:1px solid var(--surface-border);font-size:.85rem;color:var(--accent-light);font-weight:500}.checkpoint:before{content:"✓";display:flex;align-items:center;justify-content:center;width:18px;height:18px;border-radius:50%;background:#0000ff26;font-size:.7rem;flex-shrink:0}code{font-family:JetBrains Mono,monospace;font-size:.85em}:not(pre)>code{background:#fffcbd14;padding:2px 7px;border-radius:var(--radius-sm);color:var(--text)}pre{background:#1e2320;border:1px solid var(--surface-border);border-radius:var(--radius);padding:16px 20px;margin:12px 0 16px;overflow-x:auto;position:relative}pre:before{content:attr(data-lang);position:absolute;top:8px;right:12px;font-size:.65rem;font-family:JetBrains Mono,monospace;color:var(--surface-border);text-transform:uppercase;letter-spacing:.05em}pre code{color:var(--text);font-size:.82rem;line-height:1.6}pre.terminal{border-color:#00f3}pre.terminal:before{content:"terminal"}pre.terminal code .prompt{color:var(--accent-light)}.block-nav{display:flex;justify-content:space-between;align-items:center;margin-top:48px;padding-top:24px;border-top:1px solid var(--surface-border)}.block-nav a{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;background:var(--surface);border:1px solid var(--surface-border);border-radius:var(--radius);color:var(--text);font-size:.9rem;font-weight:500;text-decoration:none;transition:border-color .2s,background .2s}.block-nav a:hover{border-color:var(--accent-light);background:#0000ff0d;text-decoration:none}.block-nav .spacer{flex:1}@media(max-width:768px){#sidebar{transform:translate(-100%);transition:transform .25s ease}#sidebar.open{transform:translate(0)}#sidebar-toggle{display:flex}#content{margin-left:0;padding:60px 20px 80px}.overview-header h1{font-size:1.6rem}.block-cards{gap:14px}.block-card,.exercise{padding:18px}.exercise-body{padding-left:0}.block-nav{flex-direction:column;gap:12px}.block-nav a{width:100%;justify-content:center}.block-nav .spacer{display:none}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--surface-border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--muted)}.option-list{list-style:none;padding-left:0}.option-list li{padding:8px 12px;background:#fffcbd08;border:1px solid var(--surface-border);border-radius:var(--radius-sm);margin-bottom:8px}.option-list li strong{color:var(--text)}.repo-link{display:inline-block;margin-top:8px;font-family:JetBrains Mono,monospace;font-size:.95rem;color:var(--accent-light);text-decoration:none}.repo-link:hover{text-decoration:underline}.site-credit{position:fixed;bottom:8px;right:16px;font-family:JetBrains Mono,monospace;font-size:11px;color:var(--muted);opacity:.5;z-index:100}.site-credit a{color:var(--text);text-decoration:none}.site-credit a:hover{text-decoration:underline}