:root{--bg: #0b0f19;--surface: #131a2a;--surface-2: #182036;--border: #22304d;--text: #e6edf7;--muted: #8b9bb7;--accent: #4f8cff;--ok: #2ea36a;--err: #d8544f;color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}h1,h2,h3{margin:0;line-height:1.25}.muted{color:var(--muted)}.boot{min-height:100vh;display:grid;place-items:center;color:var(--muted)}.auth-shell{min-height:100vh;display:grid;place-items:center;padding:2rem}.auth-card{width:min(100%,24rem);background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:2.25rem;display:flex;flex-direction:column;gap:1rem}.eyebrow{margin:0;font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}.auth-card h1{font-size:1.6rem}.lede{margin:0;color:var(--muted);line-height:1.6}.field{display:flex;flex-direction:column;gap:.4rem;font-size:.85rem;color:var(--muted)}.field input{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.7rem .85rem;color:var(--text);font-size:.95rem;font-family:inherit}.field input:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:transparent}.btn-primary{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:.75rem 1rem;font-size:.95rem;font-weight:600;font-family:inherit;cursor:pointer;margin-top:.25rem}.btn-primary:disabled{opacity:.6;cursor:progress}.btn-ghost{background:transparent;color:var(--muted);border:1px solid var(--border);border-radius:8px;padding:.45rem .8rem;font-size:.85rem;font-family:inherit;cursor:pointer}.btn-ghost:hover{color:var(--text);border-color:var(--accent)}.form-error{margin:0;color:var(--err);font-size:.85rem;padding:.6rem .75rem;border:1px solid color-mix(in srgb,var(--err) 40%,transparent);border-radius:8px}.app-shell{min-height:100vh}.topbar{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.85rem 1.5rem;border-bottom:1px solid var(--border);background:var(--surface);flex-wrap:wrap}.brand{display:flex;align-items:center;gap:.7rem}.brand-mark{width:2rem;height:2rem;display:grid;place-items:center;border-radius:8px;background:var(--accent);color:#fff;font-weight:700}.brand div{display:flex;flex-direction:column;line-height:1.2}.brand-sub{font-size:.75rem;color:var(--muted)}.topbar-right{display:flex;align-items:center;gap:.9rem}.who{display:flex;align-items:center;gap:.5rem;font-size:.9rem}.role-chip{font-size:.7rem;padding:.15rem .5rem;border-radius:999px;background:color-mix(in srgb,var(--accent) 18%,transparent);color:var(--accent)}.content{max-width:68rem;margin:0 auto;padding:2rem 1.5rem 4rem;display:flex;flex-direction:column;gap:2rem}.content>h1{font-size:1.75rem}.section-head{display:flex;align-items:center;gap:.6rem;margin-bottom:.9rem}.section-head h2{font-size:1.05rem}.count{font-size:.75rem;color:var(--muted);background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:.1rem .5rem}.card-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,17rem),1fr));gap:1rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.1rem;display:flex;flex-direction:column;gap:.6rem}.card h3{font-size:1rem}.card .muted{font-size:.85rem;line-height:1.5}.meta{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:auto}.tag{font-size:.72rem;padding:.2rem .55rem;border-radius:999px;background:color-mix(in srgb,var(--accent) 16%,transparent);color:var(--accent);white-space:nowrap}.tag-quiet{background:var(--surface-2);color:var(--muted);border:1px solid var(--border)}.empty{color:var(--muted);border:1px dashed var(--border);border-radius:10px;padding:1.5rem;text-align:center;margin:0}.perm-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem}@media(max-width:40rem){.topbar{padding:.75rem 1rem}.content{padding:1.5rem 1rem 3rem}}.brand{text-decoration:none;color:inherit}.mainnav{display:flex;gap:.25rem;flex:1;margin-left:1rem}.mainnav a{padding:.4rem .7rem;border-radius:8px;color:var(--muted);text-decoration:none;font-size:.9rem}.mainnav a:hover{color:var(--text);background:var(--surface-2)}.mainnav a.active{color:var(--accent);background:color-mix(in srgb,var(--accent) 14%,transparent)}.searchbar input{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.45rem .7rem;color:var(--text);font-family:inherit;font-size:.85rem;width:14rem}.searchbar input:focus{outline:2px solid var(--accent);outline-offset:-1px}.page-head{display:flex;flex-direction:column;gap:.5rem}.page-head h1{font-size:1.75rem}.small{font-size:.8rem}.form-notice{margin:0;color:var(--ok);font-size:.85rem;padding:.6rem .75rem;border:1px solid color-mix(in srgb,var(--ok) 40%,transparent);border-radius:8px}.card-link a{text-decoration:none;color:inherit;display:flex;flex-direction:column;gap:.6rem;height:100%}.card-link:hover{border-color:var(--accent)}.stat-row{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,11rem),1fr));gap:1rem}.stat{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1rem;display:flex;flex-direction:column;gap:.25rem}.stat-label{font-size:.75rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}.stat-value{font-size:1.6rem;line-height:1.1}.stat-sub{font-size:.78rem;color:var(--muted)}.continue-card{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;padding:1.1rem 1.25rem;background:var(--surface);border:1px solid var(--accent);border-radius:12px;text-decoration:none;color:inherit;flex-wrap:wrap}.continue-card strong{display:block;font-size:1.05rem;margin-top:.2rem}.continue-progress{display:flex;flex-direction:column;gap:.35rem;min-width:10rem}.bar{height:6px;background:var(--surface-2);border-radius:999px;overflow:hidden}.bar-fill{height:100%;background:var(--accent)}.outline-module,.builder-module{border:1px solid var(--border);border-radius:12px;padding:1.1rem;margin-bottom:1rem;background:var(--surface)}.outline-week,.builder-week{margin:1rem 0 0 .5rem;padding-left:.9rem;border-left:2px solid var(--border)}.outline-day,.builder-day{margin:.9rem 0 0 .5rem}.outline-week h3{font-size:.95rem;display:flex;gap:.5rem;align-items:baseline}.week-title{color:var(--muted);font-weight:400}.outline-day h4,.builder-day h5{font-size:.88rem;color:var(--muted);display:flex;gap:.5rem;align-items:center}.lesson-list{list-style:none;margin:.5rem 0 0;padding:0;display:flex;flex-direction:column;gap:.35rem}.lesson-link{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.55rem .75rem;border-radius:8px;background:var(--surface-2);text-decoration:none;color:inherit;flex-wrap:wrap}.lesson-link:hover{background:color-mix(in srgb,var(--accent) 14%,var(--surface-2))}.lesson-title{font-size:.92rem}.tag-warn{background:color-mix(in srgb,#d9a11a 20%,transparent);color:#e3b23c}.lesson{display:flex;flex-direction:column;gap:1.5rem}.lesson-head{display:flex;flex-direction:column;gap:.5rem}.lesson-head h1{font-size:2rem}.tabs{display:flex;gap:.4rem;border-bottom:1px solid var(--border);flex-wrap:wrap}.tab{background:none;border:none;border-bottom:2px solid transparent;color:var(--muted);padding:.6rem .85rem;font-family:inherit;font-size:.9rem;cursor:pointer;display:flex;align-items:center;gap:.4rem}.tab:hover{color:var(--text)}.tab-on{color:var(--accent);border-bottom-color:var(--accent)}.lesson-section{display:flex;flex-direction:column;gap:.6rem}.lesson-section h2{font-size:1.2rem;padding-bottom:.4rem;border-bottom:1px solid var(--border)}.lesson-actions{padding-top:1rem;border-top:1px solid var(--border)}.prose{line-height:1.7}.prose>*+*{margin-top:.9rem}.prose h1,.prose h2,.prose h3,.prose h4{margin-top:1.6rem;line-height:1.3}.prose ul,.prose ol{padding-left:1.4rem}.prose li+li{margin-top:.35rem}.prose a{color:var(--accent)}.prose blockquote{margin:0;padding:.6rem 1rem;border-left:3px solid var(--accent);background:var(--surface-2);border-radius:0 8px 8px 0;color:var(--muted)}.code-inline{background:var(--surface-2);border:1px solid var(--border);border-radius:5px;padding:.1rem .35rem;font-size:.86em;font-family:ui-monospace,SF Mono,Menlo,Consolas,monospace}.code-block{position:relative;background:#0d1220;border:1px solid var(--border);border-radius:10px;padding:1.6rem 1rem 1rem;overflow-x:auto;font-size:.85rem;line-height:1.6;font-family:ui-monospace,SF Mono,Menlo,Consolas,monospace}.code-block code{background:none;border:none;padding:0}.code-lang{position:absolute;top:.4rem;right:.7rem;font-size:.68rem;text-transform:uppercase;letter-spacing:.09em;color:var(--muted)}.table-scroll{overflow-x:auto}.prose table,.data-table{border-collapse:collapse;width:100%;font-size:.88rem}.prose th,.prose td,.data-table th,.data-table td{border:1px solid var(--border);padding:.5rem .7rem;text-align:left}.prose th,.data-table th{background:var(--surface-2);font-weight:600}.data-table .num{text-align:right;font-variant-numeric:tabular-nums}.lab{display:flex;flex-direction:column;gap:.8rem}.lab h2{font-size:1.3rem}.lab h3{font-size:1rem;margin-top:.5rem}.lab-steps{padding-left:1.5rem;display:flex;flex-direction:column;gap:1rem}.expected{color:var(--muted);font-size:.85rem;margin:.4rem 0 0}.cleanup{border:1px solid color-mix(in srgb,#d9a11a 45%,transparent);background:color-mix(in srgb,#d9a11a 8%,transparent);border-radius:10px;padding:.9rem 1.1rem}.cleanup h3{margin-top:0;color:#e3b23c}.quiz{display:flex;flex-direction:column;gap:1.2rem}.quiz-question,.quiz-review{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.1rem}.quiz-review.right{border-color:color-mix(in srgb,var(--ok) 45%,transparent)}.quiz-review.wrong{border-color:color-mix(in srgb,var(--err) 45%,transparent)}.quiz-q{display:flex;gap:.6rem;margin:0 0 .8rem;line-height:1.5}.quiz-num{flex:0 0 1.5rem;height:1.5rem;display:grid;place-items:center;border-radius:999px;background:var(--surface-2);font-size:.75rem;color:var(--muted)}.quiz-options{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.45rem}.quiz-option{display:flex;align-items:center;gap:.6rem;padding:.6rem .8rem;border:1px solid var(--border);border-radius:8px;background:var(--bg);cursor:pointer;font-size:.9rem}label.quiz-option:hover{border-color:var(--accent)}.quiz-option.picked{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,var(--bg))}.quiz-option.is-correct{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 12%,var(--bg))}.quiz-option.is-wrong-pick{border-color:var(--err);background:color-mix(in srgb,var(--err) 12%,var(--bg))}.quiz-option .mark{width:1rem;color:var(--muted)}.quiz-explain{margin:.8rem 0 0;padding:.7rem .9rem;background:var(--surface-2);border-radius:8px;font-size:.88rem;line-height:1.6;color:var(--muted)}.quiz-submit{display:flex;align-items:center;justify-content:space-between;gap:1rem}.hint{color:var(--muted);font-size:.8rem;margin:0 0 .5rem}.quiz-score{display:flex;align-items:baseline;gap:1rem;padding:1.2rem;border-radius:12px;border:1px solid var(--border);flex-wrap:wrap}.quiz-score strong{font-size:2.2rem}.quiz-pass{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 10%,transparent)}.quiz-fail{border-color:var(--err);background:color-mix(in srgb,var(--err) 10%,transparent)}.revision{display:flex;flex-direction:column;gap:1rem}.card-counter{display:flex;align-items:center;gap:.6rem;color:var(--muted);font-size:.85rem}.flashcard{width:100%;min-height:11rem;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:1.5rem;cursor:pointer;text-align:left;color:inherit;font-family:inherit;display:flex;flex-direction:column;justify-content:space-between;gap:1rem}.flashcard:hover{border-color:var(--accent)}.flashcard.flipped{background:var(--surface-2);border-color:var(--accent)}.flashcard-hint{font-size:.75rem;color:var(--muted)}.deck-nav{display:flex;gap:.6rem}.interview-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.5rem}.interview-item{border:1px solid var(--border);border-radius:10px;background:var(--surface);overflow:hidden}.interview-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.85rem 1rem;background:none;border:none;color:inherit;font-family:inherit;font-size:.92rem;text-align:left;cursor:pointer;flex-wrap:wrap}.interview-q:hover{background:var(--surface-2)}.interview-a{padding:0 1rem 1rem;border-top:1px solid var(--border)}.inline-form{display:flex;gap:.5rem;flex-wrap:wrap;margin:.6rem 0}.inline-form input{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.5rem .7rem;color:var(--text);font-family:inherit;font-size:.85rem;flex:1 1 12rem}.inline-form.small input{font-size:.8rem;padding:.4rem .6rem}.field select{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.6rem .7rem;color:var(--text);font-family:inherit;font-size:.9rem}.builder-lesson{border:1px solid var(--border);border-radius:10px;padding:.8rem;margin:.5rem 0;background:var(--surface-2)}.builder-lesson-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.builder-lesson-head a{color:var(--text);text-decoration:none;font-size:.92rem}.builder-lesson-head a:hover{color:var(--accent)}.generate-row{display:flex;gap:.4rem;margin-top:.7rem;flex-wrap:wrap}.btn-generate{background:color-mix(in srgb,var(--accent) 16%,transparent);color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 40%,transparent);border-radius:999px;padding:.3rem .75rem;font-size:.78rem;font-family:inherit;cursor:pointer}.btn-generate:hover:not(:disabled){background:var(--accent);color:#fff}.btn-generate:disabled{opacity:.5;cursor:default}.result-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.4rem}.result-list a{display:flex;align-items:center;gap:.6rem;padding:.6rem .8rem;border-radius:8px;background:var(--surface);border:1px solid var(--border);text-decoration:none;color:inherit;flex-wrap:wrap}.result-list a:hover{border-color:var(--accent)}@media(max-width:60rem){.mainnav{order:3;width:100%;margin-left:0}.searchbar{order:2}.searchbar input{width:100%}}.note-form{display:flex;flex-direction:column;gap:.6rem}.note-form input,.note-form textarea{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.65rem .8rem;color:var(--text);font-family:inherit;font-size:.9rem}.note-form textarea{resize:vertical;line-height:1.6;font-family:ui-monospace,SF Mono,Menlo,monospace}.note-form input:focus,.note-form textarea:focus{outline:2px solid var(--accent);outline-offset:-1px}.note-form-actions{display:flex;gap:.6rem}.note-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.8rem}.note{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1rem 1.1rem;display:flex;flex-direction:column;gap:.6rem}.note.pinned{border-color:var(--accent)}.note-head{display:flex;align-items:center;justify-content:space-between;gap:1rem}.note-actions{display:flex;gap:.2rem}.btn-icon{background:none;border:1px solid transparent;border-radius:6px;color:var(--muted);padding:.2rem .45rem;font-size:.9rem;font-family:inherit;cursor:pointer}.btn-icon:hover{color:var(--text);border-color:var(--border);background:var(--surface-2)}.inline-bookmark{font-size:.72rem}.badge-row{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.6rem}.badge{display:flex;align-items:center;gap:.5rem;padding:.5rem .85rem;background:var(--surface);border:1px solid var(--border);border-radius:999px;font-size:.82rem}.badge-icon{font-size:1.1rem}.badge-title{color:var(--muted)}.lab-warning{border:1px solid color-mix(in srgb,#d9a11a 50%,transparent);background:color-mix(in srgb,#d9a11a 9%,transparent);border-radius:12px;padding:1.1rem 1.25rem}.lab-warning h2{font-size:1.05rem;color:#e3b23c;margin-bottom:.4rem}.lab-warning .lede{margin-bottom:.8rem}.lab-actions{display:flex;flex-direction:column;gap:.5rem;padding-top:.9rem;border-top:1px solid var(--border)}.checkline{display:flex;align-items:center;gap:.6rem;font-size:.88rem;cursor:pointer;color:var(--muted)}.checkline:hover{color:var(--text)}.syllabus-panel{border:1px solid var(--border);border-radius:10px;background:var(--surface-2);padding:1rem 1.15rem;margin-bottom:1.25rem}.syllabus-panel h3{font-size:1rem;margin-bottom:.35rem}.syllabus-panel .muted{margin:0 0 .85rem;font-size:.875rem;line-height:1.5}.syllabus-controls{display:flex;flex-wrap:wrap;align-items:flex-end;gap:.75rem}.syllabus-controls .field{margin:0;min-width:7rem}.syllabus-controls .field.grow{flex:1 1 18rem;min-width:12rem}.syllabus-controls button{flex:0 0 auto}.btn-danger{border:1px solid var(--err);background:color-mix(in srgb,var(--err) 18%,transparent);color:var(--text);border-radius:8px;padding:.6rem 1rem;font:inherit;font-weight:600;cursor:pointer}.btn-danger:hover:not(:disabled){background:color-mix(in srgb,var(--err) 30%,transparent)}.btn-danger:disabled{opacity:.6;cursor:default}.cost-estimate{margin:.9rem 0 0;padding:.7rem .85rem;border-left:3px solid var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent);border-radius:0 6px 6px 0;font-size:.9rem;line-height:1.55}.small{font-size:.85rem}.user-form{display:flex;flex-wrap:wrap;gap:.6rem}.user-form input,.user-form select{flex:1 1 12rem;min-width:9rem;padding:.6rem .7rem;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);font:inherit}.user-form button{flex:0 0 auto}.user-list,.role-list{list-style:none;margin:0;padding:0;display:grid;gap:.6rem}.user-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem;padding:.85rem 1rem;border:1px solid var(--border);border-radius:10px;background:var(--surface)}.user-row.inactive{opacity:.55}.user-main{min-width:14rem}.user-actions{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}.user-actions select{padding:.45rem .6rem;border-radius:8px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font:inherit}.user-actions select:disabled,.user-actions button:disabled{opacity:.45;cursor:not-allowed}.user-row .inline-form{flex:1 1 100%;margin-top:.3rem}.role-card{padding:.85rem 1rem;border:1px solid var(--border);border-radius:10px;background:var(--surface)}.role-card .muted{margin:.2rem 0 .5rem;font-size:.875rem}.lesson-summary{display:block;margin:.15rem 0 .3rem;font-size:.85rem;line-height:1.45;color:var(--muted)}.scenario{border:1px solid var(--border);border-radius:10px;background:var(--surface-2);padding:.75rem 1rem;margin-bottom:1.25rem}.scenario>summary{cursor:pointer;font-weight:600;color:var(--text)}.scenario>summary+*{margin-top:.75rem}.depends-on{border-left:3px solid var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent);border-radius:0 6px 6px 0;padding:.6rem .9rem;margin:.9rem 0}.depends-on h3{font-size:.95rem;margin:0 0 .3rem}.cleanup.keeps{border-left-color:var(--accent);background:color-mix(in srgb,var(--accent) 8%,transparent)}.cleanup.keeps .lede{font-size:.9rem;margin:.3rem 0 .6rem}.builder-module>summary{display:flex;align-items:center;gap:.6rem;cursor:pointer;padding:.7rem .9rem;border-radius:8px;background:var(--surface-2);list-style:none}.builder-module>summary::-webkit-details-marker{display:none}.builder-module>summary:before{content:"▸";color:var(--muted);transition:transform .15s ease}.builder-module[open]>summary:before{transform:rotate(90deg)}.builder-module>summary:hover{background:color-mix(in srgb,var(--accent) 12%,var(--surface-2))}.builder-module>summary strong{flex:1 1 auto}.count.done{color:var(--ok)}.builder-day-head{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.6rem;margin-bottom:.4rem}.btn-primary.small,.btn-ghost.small{padding:.35rem .7rem;font-size:.85rem}.generate-row{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:2.5rem;align-items:start}@media(min-width:68rem){.lesson-layout.with-toc{grid-template-columns:15rem minmax(0,1fr)}}.lesson-toc{display:none}@media(min-width:68rem){.with-toc .lesson-toc{display:block;position:sticky;top:5rem;max-height:calc(100vh - 7rem);overflow-y:auto;padding-right:.5rem}}.toc-title{margin:0 0 .6rem;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.lesson-toc ol{list-style:none;margin:0;padding:0;display:grid;gap:.15rem}.lesson-toc a{display:block;padding:.35rem .6rem;border-left:2px solid var(--border);color:var(--muted);text-decoration:none;font-size:.85rem;line-height:1.4}.lesson-toc a:hover{color:var(--text);border-left-color:var(--muted)}.lesson-toc a.active{color:var(--text);border-left-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent)}.read-progress{position:fixed;top:0;left:0;right:0;height:3px;background:transparent;z-index:20}.read-progress-fill{height:100%;background:var(--accent);transition:width .15s linear}.lesson{max-width:42rem}.lesson-section{margin-bottom:2.75rem}.lesson-section h2{font-size:1.3rem;line-height:1.3;margin-bottom:.9rem;padding-top:.5rem;scroll-margin-top:5rem}.lesson-section h3{font-size:1.05rem;margin:1.75rem 0 .6rem}.lesson-section p,.lesson-section li{font-size:1rem;line-height:1.75}.lesson-section p{margin:0 0 1.15rem}.lesson-section ul,.lesson-section ol{margin:0 0 1.15rem;padding-left:1.3rem}.lesson-section li{margin-bottom:.45rem}.lesson-section strong{color:#fff}.lesson-section pre,.lesson pre{max-width:none}.lesson-head h1{font-size:2rem;line-height:1.25;margin-bottom:.5rem}.lesson-head .lede{font-size:1.05rem;line-height:1.65;color:var(--muted);margin-bottom:1rem}.position{color:var(--muted)}.lesson-nav{display:grid;grid-template-columns:1fr;gap:.75rem;margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--border)}@media(min-width:40rem){.lesson-nav{grid-template-columns:1fr 1fr}}.lesson-nav-link{display:block;padding:.9rem 1.1rem;border:1px solid var(--border);border-radius:10px;background:var(--surface);text-decoration:none;color:var(--text)}.lesson-nav-link:hover{border-color:var(--accent);background:var(--surface-2)}.lesson-nav-link strong{display:block;margin-top:.2rem;line-height:1.4}.lesson-nav-link.next{text-align:right;border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}.lesson-nav-link.prev{opacity:.75}.lesson-nav-link.prev:hover{opacity:1}.code-wrap{position:relative}.code-copy{position:absolute;top:.5rem;right:.5rem;z-index:1;padding:.25rem .55rem;font-size:.72rem;font-family:inherit;border:1px solid var(--border);border-radius:6px;background:var(--surface-2);color:var(--muted);cursor:pointer;opacity:0;transition:opacity .12s ease}.code-wrap:hover .code-copy,.code-copy:focus-visible{opacity:1}.code-copy:hover{color:var(--text);border-color:var(--accent)}.lesson-layout:not(.with-toc)>.lesson{margin-inline:auto}.empty-lesson{border:1px dashed var(--border);border-radius:12px;padding:2rem 1.75rem;background:var(--surface)}.empty-lesson h2{font-size:1.1rem;margin:0 0 .6rem}.empty-lesson p{margin:0 0 .75rem;font-size:.95rem;line-height:1.65;color:var(--muted)}.empty-lesson p:last-child{margin-bottom:0}.empty-lesson a{color:var(--accent)}.paste-panel{margin-top:.6rem;padding:.85rem;border:1px solid var(--border);border-radius:10px;background:var(--surface-2);display:grid;gap:.6rem}.paste-controls{display:flex;flex-wrap:wrap;align-items:flex-end;gap:.6rem}.paste-controls .field{margin:0;min-width:9rem}.paste-panel textarea{width:100%;padding:.6rem .7rem;border-radius:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.8rem;line-height:1.5;resize:vertical}.paste-panel textarea:focus{outline:none;border-color:var(--accent)}
