:root{--bg: #08090a;--bg-soft: #0d0e10;--panel: #141517;--panel-2: #1b1d21;--border: rgba(255, 255, 255, .1);--border-soft: rgba(255, 255, 255, .06);--text: #f7f8f8;--muted: #8a8f98;--faint: #62666d;--accent: #5e6ad2;--accent-strong: #5e6ad2;--accent-hover: #6b76e0;--accent-soft: rgba(94, 106, 210, .16);--accent-2: #54c8ff;--good: #4cc38a;--warn: #f2b455;--bad: #ff6369;--on-accent: #f7f8f8;--on-accent-dark: #0b0c10;--r-sm: 8px;--r: 12px;--r-lg: 18px;--r-xl: 22px;--shadow: 0 18px 50px -22px rgba(0, 0, 0, .85), 0 1px 0 0 rgba(255, 255, 255, .03) inset;--shadow-lg: 0 44px 100px -46px rgba(0, 0, 0, .92), 0 1px 0 0 rgba(255, 255, 255, .04) inset;--glow: none;--mono: "JetBrains Mono", ui-monospace, "SF Mono", "Fira Code", Menlo, Consolas, monospace;--sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;--display: "Inter Tight", "Inter", system-ui, sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:15px;line-height:1.55;letter-spacing:-.011em;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}::selection{background:#5e6ad266;color:#fff}.topo{position:fixed;top:0;right:0;bottom:0;left:0;width:100%;height:100%;z-index:0;pointer-events:none;opacity:.4;-webkit-mask-image:radial-gradient(120% 120% at 78% 6%,#000 0%,transparent 62%),radial-gradient(120% 120% at 8% 92%,#000 0%,transparent 60%);mask-image:radial-gradient(120% 120% at 78% 6%,#000 0%,transparent 62%),radial-gradient(120% 120% at 8% 92%,#000 0%,transparent 60%)}.topo-field path{fill:none;stroke:#ffffff0e;stroke-width:1;vector-effect:non-scaling-stroke}.topo-field-tint path{stroke:#ffffff0d}.sidebar,.content{position:relative;z-index:1}*{scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.14) transparent}*::-webkit-scrollbar{width:10px;height:10px}*::-webkit-scrollbar-thumb{background:#ffffff1f;border:2px solid transparent;background-clip:padding-box;border-radius:999px}*::-webkit-scrollbar-thumb:hover{background:#ffffff38;background-clip:padding-box}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}a{color:inherit;text-decoration:none}h1,h2,h3,h4{font-family:var(--display);line-height:1.15;margin:0 0 .4em;font-weight:700;letter-spacing:-.022em}em{color:var(--accent);font-style:normal}.app-shell{display:grid;grid-template-columns:272px 1fr;min-height:100vh;transition:grid-template-columns .18s ease}.app-shell-collapsed{grid-template-columns:68px 1fr}.sidebar{position:sticky;top:0;align-self:start;height:100vh;display:flex;flex-direction:column;gap:6px;padding:20px 14px;background:var(--bg-soft);border-right:1px solid var(--border-soft)}.sidebar-top{display:flex;align-items:flex-start;gap:4px}.brand{display:flex;align-items:center;gap:12px;padding:8px 10px 16px;font-weight:800;font-size:17px;flex:1;min-width:0}.sidebar-toggle{flex:none;width:26px;height:26px;margin-top:10px;display:grid;place-items:center;font:inherit;font-size:14px;font-weight:700;color:var(--faint);background:var(--bg-soft);border:1px solid var(--border-soft);border-radius:7px;cursor:pointer;transition:color .15s,border-color .15s}.sidebar-toggle:hover{color:var(--text);border-color:var(--accent)}.brand small{display:block;font-weight:500;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--faint)}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--accent);color:var(--on-accent);font-size:20px;box-shadow:none}.nav{display:flex;flex-direction:column;gap:3px;overflow-y:auto}.nav-section{display:flex;flex-direction:column;gap:1px;margin:16px 10px 6px;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--faint)}.nav-section-num{font-size:9.5px;letter-spacing:.16em;color:var(--accent);opacity:.75}.nav-link{display:flex;align-items:center;gap:11px;padding:9px 11px;border-radius:var(--r-sm);color:var(--muted);font-weight:600;transition:background .15s,color .15s}.nav-link:hover{background:var(--panel);color:var(--text)}.nav-link-active{background:var(--panel-2);color:var(--text);box-shadow:inset 0 0 0 1px var(--border)}.nav-icon{font-size:16px;width:18px;text-align:center}.nav-text{display:flex;flex-direction:column;gap:5px;flex:1;min-width:0}.minibar{display:block;height:4px;border-radius:4px;background:var(--border-soft);overflow:hidden}.minibar-fill{display:block;height:100%;background:var(--accent);transition:width .4s ease}.sidebar-foot{margin-top:auto;padding:12px 10px 4px;font-size:11px;color:var(--faint)}.content{padding:36px clamp(20px,4vw,56px) 80px;max-width:1560px;width:100%}.page{display:flex;flex-direction:column;gap:28px}.hero h1{font-size:clamp(32px,4.6vw,56px);letter-spacing:-.028em;max-width:16ch}.hero-sub{color:var(--muted);font-size:17px;max-width:58ch;margin:10px 0 22px}.eyebrow{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:11.5px;font-weight:500;letter-spacing:.22em;text-transform:uppercase;color:var(--muted)}.eyebrow:before{content:"";width:16px;height:1px;background:var(--accent)}.eyebrow:has(svg):before{display:none}.eyebrow svg{color:var(--accent)}.hero-split{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);align-items:center;gap:clamp(28px,4vw,64px);padding:clamp(8px,3vw,32px) 0 12px}.hero-lead{display:flex;flex-direction:column;align-items:flex-start;gap:20px}.hero-lead h1{font-size:clamp(40px,5.2vw,74px);line-height:1.02;letter-spacing:-.035em;max-width:13ch;margin:0}.hero-lead .hero-sub{margin:0;max-width:46ch;font-size:clamp(15px,1.3vw,17px)}.hero-cta{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.btn-lg{padding:12px 22px;font-size:15px;border-radius:10px}.hero-link{font:inherit;font-weight:600;font-size:14px;color:var(--muted);background:none;border:none;cursor:pointer;transition:color .15s}.hero-link:hover{color:var(--text)}.hero-split .hero-progress{width:100%;max-width:520px;margin-top:2px}.hero-stage{position:relative}.hero-stage:before{content:"";position:absolute;top:-14%;right:-8%;bottom:-14%;left:-8%;background:none;z-index:-1}.sim{position:relative;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--panel);box-shadow:var(--shadow-lg);padding:18px 18px 16px;overflow:hidden}.sim:after{content:"";position:absolute;inset:0 0 auto 0;height:1px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.18),transparent)}.sim-bar{display:flex;align-items:center;gap:9px;margin-bottom:16px;font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint)}.sim-dot{width:9px;height:9px;border-radius:999px;background:var(--accent)}.sim-live{margin-left:auto;display:inline-flex;align-items:center;gap:6px;font-size:10.5px;letter-spacing:.1em;color:var(--accent)}.sim-live:before{content:"";width:6px;height:6px;border-radius:999px;background:var(--accent)}.sim-grid{display:flex;flex-direction:column;gap:9px}.sim-lane{display:flex;align-items:center;gap:11px}.sim-lane-label{width:36px;flex:none;font-family:var(--mono);font-size:10.5px;letter-spacing:.04em;color:var(--faint)}.sim-cells{flex:1;display:grid;grid-auto-flow:column;grid-auto-columns:1fr;gap:4px}.sim-cell{height:20px;border-radius:4px;background:#ffffff09;box-shadow:inset 0 0 0 1px var(--border-soft);transition:background .28s ease,box-shadow .28s ease}.sim-cell-on{background:color-mix(in srgb,var(--accent) 55%,transparent);box-shadow:none}.sim-cell-active{background:var(--accent);box-shadow:0 0 0 1px #ffffff38}.sim-status{display:flex;align-items:center;gap:11px;margin-top:18px;font-family:var(--mono);font-size:11.5px;color:var(--muted)}.sim-status b{color:var(--accent);font-weight:600}.sim-status .sim-sep{width:1px;height:11px;background:var(--border)}.sim-status .num{font-variant-numeric:tabular-nums;color:var(--text)}.hero-progress{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.bigbar{flex:1;min-width:200px;max-width:420px;height:10px;border-radius:10px;background:var(--panel-2);overflow:hidden;box-shadow:inset 0 0 0 1px var(--border-soft)}.bigbar-fill{height:100%;background:var(--accent);transition:width .5s ease}.hero-progress-label{color:var(--muted);font-size:13px;font-weight:600}.link-reset{background:none;border:none;color:var(--faint);cursor:pointer;font-size:13px;text-decoration:underline}.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:18px}.module-card{display:flex;flex-direction:column}.module-card-title{display:flex;align-items:center;gap:10px}.module-card-icon{font-size:20px}.module-card-sum{color:var(--muted);margin:0 0 12px}.module-card-outcomes{margin:0 0 16px;padding-left:18px;color:var(--faint);font-size:13px;display:flex;flex-direction:column;gap:3px}.module-card .btn{margin-top:auto;align-self:flex-start}.references h2{font-size:22px}.references-intro{color:var(--muted);max-width:70ch;margin-top:-6px}.reference-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}.reference{display:flex;flex-direction:column;gap:4px;padding:16px;border-radius:var(--r);background:var(--panel);border:1px solid var(--border-soft);transition:transform .15s,border-color .15s}.reference:hover{transform:translateY(-2px);border-color:var(--accent)}.reference-authors{font-size:12px;color:var(--accent)}.reference-note{font-size:13px;color:var(--muted)}.card{background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-lg);padding:20px 22px;box-shadow:var(--shadow)}.card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:16px}.card-title{font-size:18px;margin:0}.card-sub{margin:4px 0 0;color:var(--muted);font-size:13.5px}.btn{font:inherit;font-weight:650;cursor:pointer;border-radius:var(--r-sm);padding:9px 16px;border:1px solid var(--border);background:var(--panel-2);color:var(--text);transition:transform .08s,background .15s,border-color .15s,opacity .15s}.btn:hover{border-color:var(--accent)}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:transparent;color:#fff;box-shadow:inset 0 1px #ffffff1f}.btn-primary:hover{background:var(--accent-hover);border-color:transparent}.btn-ghost{background:transparent}.btn-danger{background:transparent;border-color:var(--bad);color:var(--bad)}.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:12px}.slider{display:flex;flex-direction:column;gap:6px;min-width:160px}.slider-label{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}.slider-label b{color:var(--text);font-variant-numeric:tabular-nums}input[type=range]{-webkit-appearance:none;-moz-appearance:none;appearance:none;height:5px;border-radius:5px;background:var(--border);outline:none}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--accent);cursor:pointer;box-shadow:0 0 0 4px var(--accent-soft)}input[type=range]::-moz-range-thumb{width:16px;height:16px;border:none;border-radius:50%;background:var(--accent);cursor:pointer}.select{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}.select select{font:inherit;color:var(--text);background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-sm);padding:8px 10px;cursor:pointer}.tabs{display:inline-flex;gap:4px;padding:4px;background:var(--bg-soft);border:1px solid var(--border-soft);border-radius:10px}.tab{font:inherit;font-weight:600;border:none;background:none;color:var(--muted);padding:7px 14px;border-radius:7px;cursor:pointer;transition:background .15s,color .15s}.tab:hover{color:var(--text)}.tab-active{background:var(--panel-2);color:var(--text);box-shadow:inset 0 0 0 1px var(--border)}.badge{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:700;padding:3px 9px;border-radius:999px;border:1px solid var(--border);color:var(--muted)}.badge-good{color:var(--good);border-color:#3ddc8466;background:#3ddc8414}.badge-warn{color:var(--warn);border-color:#ffb45466;background:#ffb45414}.badge-bad{color:var(--bad);border-color:#ff6b6b66;background:#ff6b6b14}.badge-accent{color:var(--accent);border-color:#5e6ad266;background:#5e6ad21a}.stat-row{display:flex;flex-wrap:wrap;gap:12px}.stat{display:flex;flex-direction:column;gap:2px;padding:12px 16px;border-radius:var(--r);background:var(--bg-soft);border:1px solid var(--border-soft);min-width:110px}.stat-value{font-size:22px;font-weight:800;font-variant-numeric:tabular-nums;color:var(--text)}.stat-label{font-size:12px;color:var(--muted)}.stat-hint{font-size:11px;color:var(--faint)}.legend{display:flex;flex-wrap:wrap;gap:14px;font-size:12.5px;color:var(--muted)}.legend-item{display:inline-flex;align-items:center;gap:6px}.legend-swatch{width:12px;height:12px;border-radius:4px;display:inline-block}.callout{display:flex;gap:12px;padding:14px 16px;border-radius:var(--r);background:var(--bg-soft);border:1px solid var(--border-soft);border-left:3px solid var(--accent)}.callout-tip{border-left-color:var(--good)}.callout-warn{border-left-color:var(--warn)}.callout-icon{font-size:16px}.callout-title{display:block;margin-bottom:2px}.callout-body{color:var(--muted);font-size:14px}.code-editor{display:flex;flex-direction:column;gap:10px}.code-caption{font-size:13px;color:var(--muted)}.code-editor textarea{width:100%;resize:vertical;font-family:var(--mono);font-size:13px;line-height:1.6;color:#dfe3ea;background:#0b0c0f;border:1px solid var(--border);border-radius:var(--r);padding:14px 16px;-moz-tab-size:2;tab-size:2}.code-editor textarea:focus{outline:none;border-color:var(--accent)}.code-actions{display:flex;gap:10px}.lesson-check{display:inline-flex;align-items:center;gap:9px;font:inherit;font-weight:650;cursor:pointer;padding:9px 16px;border-radius:var(--r-sm);border:1px solid var(--border);background:var(--panel-2);color:var(--text);transition:border-color .15s,background .15s}.lesson-check:hover{border-color:var(--good)}.lesson-check-done{border-color:#3ddc8480;background:#3ddc841a;color:var(--good)}.lesson-check-box{display:grid;place-items:center;width:18px;height:18px;border-radius:5px;border:1.5px solid currentColor;font-size:12px}.inline-code{font-family:var(--mono);font-size:.88em;background:var(--panel-2);border:1px solid var(--border-soft);border-radius:5px;padding:1px 6px}.module-header{display:flex;flex-direction:column;gap:8px;margin-bottom:6px}.module-header h1{font-size:clamp(24px,3vw,34px)}.module-header .lede{color:var(--muted);font-size:16px;max-width:70ch}.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}.row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}.col{display:flex;flex-direction:column;gap:12px}.muted{color:var(--muted)}.mono{font-family:var(--mono)}.spacer{flex:1}.empty-state{display:flex;flex-direction:column;gap:12px;align-items:flex-start;padding:60px 0}.part-section{display:flex;flex-direction:column;gap:16px}.part-head{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:6px 16px;margin:8px 0 0;padding-bottom:10px;border-bottom:1px solid var(--border-soft)}.part-title{display:flex;align-items:baseline;gap:12px;font-family:var(--mono);font-size:11.5px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--faint);margin:0}.part-num{color:var(--accent);font-size:11px;letter-spacing:.18em}.part-meta{font-size:12px;color:var(--faint);font-variant-numeric:tabular-nums}.hero-continue{margin-top:18px}.crumbs{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-bottom:18px;font-size:12.5px;font-weight:600;color:var(--faint)}.crumbs a:hover{color:var(--text)}.crumbs-sep{opacity:.5}.crumbs-here{color:var(--accent)}.chapter-nav{display:flex;justify-content:space-between;gap:14px;margin-top:40px;padding-top:18px;border-top:1px solid var(--border-soft)}.chapter-nav-link{display:flex;flex-direction:column;gap:2px;max-width:46%;padding:12px 16px;border-radius:var(--r);border:1px solid var(--border-soft);background:var(--panel);color:var(--muted);font-size:13.5px;font-weight:600;transition:border-color .15s,color .15s}.chapter-nav-link:hover{border-color:var(--accent);color:var(--text)}.chapter-nav-next{text-align:right;margin-left:auto}.chapter-nav-dir{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint)}.module-loading{display:flex;align-items:center;gap:10px;padding:60px 0;color:var(--muted);font-weight:600}.module-loading-icon{font-size:22px}.app-shell-collapsed .sidebar{padding:20px 10px}.app-shell-collapsed .sidebar-top{flex-direction:column;align-items:center;gap:8px}.app-shell-collapsed .brand{padding:0;justify-content:center}.app-shell-collapsed .brand-text,.app-shell-collapsed .nav-text,.app-shell-collapsed .nav-section-num,.app-shell-collapsed .nav-section-title,.app-shell-collapsed .sidebar-foot-text{display:none}.app-shell-collapsed .sidebar-toggle{margin-top:0}.app-shell-collapsed .nav-link{justify-content:center;padding:9px 0}.app-shell-collapsed .nav-section{height:1px;margin:12px 8px 8px;background:var(--border-soft)}.nav-group{display:flex;flex-direction:column;gap:2px}.nav-title-row{display:flex;align-items:center;gap:8px}.nav-ch{display:inline-grid;place-items:center;min-width:20px;height:18px;padding:0 5px;border-radius:5px;font-size:10.5px;font-weight:800;color:var(--faint);background:var(--bg-soft);border:1px solid var(--border-soft)}.nav-link-active .nav-ch{color:var(--accent);border-color:var(--border)}.book-switch{display:flex;flex-direction:column;gap:4px;padding:4px 6px 10px;margin-bottom:4px;border-bottom:1px solid var(--border-soft)}.book-chip{display:flex;align-items:center;gap:9px;padding:7px 9px;border-radius:var(--r-sm);border:1px solid transparent;color:var(--muted);font-weight:600;font-size:13px;cursor:pointer;transition:background .15s,color .15s,border-color .15s}.book-chip:hover{background:var(--panel);color:var(--text)}.book-chip-active{background:var(--panel-2);box-shadow:inset 0 0 0 1px var(--border)}.book-chip-icon{font-size:16px;width:18px;text-align:center;flex:none}.book-chip-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.app-shell-collapsed .book-chip-text{display:none}.app-shell-collapsed .book-switch{align-items:center}.app-shell-collapsed .book-chip{justify-content:center;padding:7px 0;width:100%}.book-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(340px,1fr));gap:22px}.book-card{display:grid;grid-template-columns:96px 1fr;gap:18px;padding:20px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow);transition:border-color .18s,transform .18s;text-decoration:none;color:var(--text);cursor:pointer}.book-card:hover{border-color:var(--book-accent, var(--accent));transform:translateY(-2px)}.book-card-cover{position:relative;display:grid;place-items:center;border-radius:var(--r);border:1px solid var(--border-soft);min-height:132px;overflow:hidden}.book-card-icon{font-size:44px}.book-card-spine{position:absolute;left:0;top:0;bottom:0;width:3px;opacity:.95}.book-card-glyph{position:relative;display:grid;place-items:center;width:44px;height:44px}.book-card-glyph-icon{grid-area:1 / 1;display:grid;place-items:center;transition:transform .5s cubic-bezier(.33,0,.2,1),opacity .42s ease}.book-card-glyph-arrow{opacity:0;transform:translate(-48px);color:var(--book-accent, var(--accent))}.book-card:hover .book-card-glyph-book{opacity:0;transform:translate(48px)}.book-card:hover .book-card-glyph-arrow{opacity:1;transform:translate(0)}.book-card-part-more{color:var(--faint);font-variant-numeric:tabular-nums}.book-card-body{display:flex;flex-direction:column;gap:10px;min-width:0}.book-card-title{font-size:19px;line-height:1.25}.book-card-by{margin:0;font-size:12.5px;color:var(--faint)}.book-card-tagline{margin:0;color:var(--muted);font-size:14px}.book-card-parts{display:flex;flex-wrap:wrap;gap:6px}.book-card-part{font-size:11px;padding:3px 8px;border-radius:999px;color:var(--muted);background:var(--bg-soft);border:1px solid var(--border-soft)}.book-card-meta{display:flex;gap:8px;margin-top:auto;padding-top:12px}.book-card-meta .badge{font-weight:600;color:var(--muted);background:var(--bg-soft);border-color:var(--border-soft)}.book-card-meta .badge-accent{color:var(--accent)}.book-card-progress{display:flex;align-items:center;gap:10px;margin:4px 0 2px}.book-card-progress .bigbar{flex:1;min-width:0}.book-card-progress-label{font-size:12px;color:var(--faint);white-space:nowrap}.lld-outcomes,.lld-points{margin:6px 0 0;padding-left:18px;display:flex;flex-direction:column;gap:4px}.lld-outcomes li,.lld-points li{color:var(--muted)}.lld-video{margin-top:16px}.lld-video-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:8px}.lld-video-head .card-title{display:flex;align-items:center;gap:10px;margin:0}.lld-video-num{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:8px;font-size:13px;font-weight:800;color:var(--on-accent-dark);background:var(--warn);flex:none}.lld-watch{font-size:13px;font-weight:700;color:var(--accent);padding:5px 11px;border:1px solid var(--border);border-radius:999px;white-space:nowrap;transition:border-color .15s,color .15s}.lld-watch:hover{border-color:var(--accent);color:var(--text)}.lld-summary{margin:0 0 10px;color:var(--text)}.lld-points{margin-bottom:12px}.lld-video-foot{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.oop-outcomes{margin:6px 0 0;padding-left:18px;display:flex;flex-direction:column;gap:4px}.oop-outcomes li{color:var(--muted)}.oop-concept{margin-top:16px}.oop-summary{margin:0 0 12px;color:var(--text);max-width:80ch}.oop-points{margin:0 0 12px;padding-left:18px;display:flex;flex-direction:column;gap:4px}.oop-points li{color:var(--muted)}.oop-code{margin:0 0 12px;padding:14px 16px;background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--r);overflow-x:auto;font-size:12.5px;line-height:1.55;color:var(--text);white-space:pre}.oop-code code{font-family:var(--mono)}.oop-concept-foot{display:flex;align-items:center;gap:12px;flex-wrap:wrap}@media (max-width: 980px){.hero-split{grid-template-columns:1fr;gap:30px}.hero-lead h1{font-size:clamp(34px,8vw,54px)}}@media (max-width: 860px){.app-shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;flex-direction:row;flex-wrap:wrap;align-items:center;border-right:none;border-bottom:1px solid var(--border-soft)}.nav{flex-direction:row;flex-wrap:wrap}.nav-section,.sidebar-foot,.sidebar-toggle{display:none}.sidebar-top{display:contents}.book-switch{flex-direction:row;flex-wrap:wrap;border-bottom:none;padding:0;margin:0}.book-card{grid-template-columns:1fr}.book-card-cover{min-height:96px}.nav-text{flex-direction:row;align-items:center;gap:8px}.minibar{width:40px}}@media (prefers-reduced-motion: reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}.book-card-glyph-icon{transition:transform .5s cubic-bezier(.33,0,.2,1),opacity .42s ease!important}}