@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:400;font-display:swap;src:url(../media/04c5164763c40239-s.0h-nw9_c8d~-_.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:400;font-display:swap;src:url(../media/26f284dcc38c84c0-s.10hk62x1-0d9n.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:400;font-display:swap;src:url(../media/7e7f32a39836f228-s.0bmyfaahigzds.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:400;font-display:swap;src:url(../media/fa39153a3fc630ba-s.0-0ft90hthv3~.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:400;font-display:swap;src:url(../media/6a5386fd6038edbe-s.16fk0g~ypa53a.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:400;font-display:swap;src:url(../media/051742360c26797e-s.p.0f97p8c3305p~.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:500;font-display:swap;src:url(../media/04c5164763c40239-s.0h-nw9_c8d~-_.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:500;font-display:swap;src:url(../media/26f284dcc38c84c0-s.10hk62x1-0d9n.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:500;font-display:swap;src:url(../media/7e7f32a39836f228-s.0bmyfaahigzds.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:500;font-display:swap;src:url(../media/fa39153a3fc630ba-s.0-0ft90hthv3~.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:500;font-display:swap;src:url(../media/6a5386fd6038edbe-s.16fk0g~ypa53a.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:500;font-display:swap;src:url(../media/051742360c26797e-s.p.0f97p8c3305p~.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:700;font-display:swap;src:url(../media/04c5164763c40239-s.0h-nw9_c8d~-_.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:700;font-display:swap;src:url(../media/26f284dcc38c84c0-s.10hk62x1-0d9n.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:700;font-display:swap;src:url(../media/7e7f32a39836f228-s.0bmyfaahigzds.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:700;font-display:swap;src:url(../media/fa39153a3fc630ba-s.0-0ft90hthv3~.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:700;font-display:swap;src:url(../media/6a5386fd6038edbe-s.16fk0g~ypa53a.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:JetBrains Mono;font-style:normal;font-weight:700;font-display:swap;src:url(../media/051742360c26797e-s.p.0f97p8c3305p~.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:JetBrains Mono Fallback;src:local(Arial);ascent-override:75.79%;descent-override:22.29%;line-gap-override:0.0%;size-adjust:134.59%}.jetbrains_mono_e46a20e9-module__a_YADW__className{font-family:JetBrains Mono,JetBrains Mono Fallback;font-style:normal}.jetbrains_mono_e46a20e9-module__a_YADW__variable{--font-mono:"JetBrains Mono", "JetBrains Mono Fallback"}
:root{--bg:#141211;--surface:#1a1816;--surface-2:#22201d;--surface-3:#2a2824;--border:#272421;--border-strong:#3a3632;--text:#b8b0a4;--text-bright:#e6dfd6;--text-dim:#8a8278;--text-muted:#5c564f;--accent:#c47a50;--green:#6e9468;--blue:#7d9ab8;--yellow:#b8965e;--red:#c45b54;--shadow:0 20px 60px #00000047;--surface2:var(--surface-2);--surface3:var(--surface-3);--accent2:#d79b73;--allow:var(--green);--deny:var(--red);--ask:var(--yellow);--warn:var(--yellow);--orange:#d18b4f;--purple:#8e82ad;--flag:#7d9ab8;--policy:#f49b96;--project:#b695f2;--local:#79b89a;--remote:#7db4c6;--user:#7ec0ee;--muted:var(--text-muted);--radius:18px;--planMode:var(--blue);--autoAccept:var(--green)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;min-height:100%}body{background:radial-gradient(circle at top, #c47a501f, transparent 28%), linear-gradient(180deg, #181513 0%, var(--bg) 30%);min-height:100vh;color:var(--text);font-family:var(--font-ui), sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}button,input,textarea,select{font:inherit}a{color:inherit;text-decoration:none}.app-body{min-height:100vh}.mono{font-family:var(--font-mono), monospace}.course-home{min-height:100vh}.course-shell{width:min(1120px,100% - 2rem);margin:0 auto;padding:1rem 0 5rem}.topbar{z-index:20;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);align-items:center;gap:1rem;padding:1rem 0;display:flex;position:sticky;top:0}.topbar:before{content:"";z-index:-1;background:#141211cc;border-bottom:1px solid #272421e6;position:absolute;inset:0 -1rem}.topbar__brand{color:var(--text-dim);letter-spacing:.08em;text-transform:uppercase;font-size:.75rem;font-family:var(--font-mono), monospace}.topbar__spacer{flex:1}.topbar__meta{color:var(--text-muted);font-size:.75rem;font-family:var(--font-mono), monospace}.hero{grid-template-columns:minmax(0,1.5fr) minmax(260px,.8fr);gap:1.5rem;padding:3rem 0 2rem;display:grid}.hero__panel,.chapter-card,.meta-card,.lesson-nav-card,.lesson-source{border:1px solid var(--border);box-shadow:var(--shadow);background:linear-gradient(#1a1816f5,#12100ff5);border-radius:16px}.hero__panel{padding:2rem}.hero__eyebrow,.section-eyebrow,.chapter-badge,.meta-kicker{border:1px solid color-mix(in srgb, var(--accent) 28%, transparent);color:var(--accent);font-family:var(--font-mono), monospace;letter-spacing:.08em;text-transform:uppercase;border-radius:999px;align-items:center;gap:.45rem;padding:.2rem .55rem;font-size:.7rem;display:inline-flex}.hero h1{color:var(--text-bright);letter-spacing:-.04em;margin-top:1rem;font-size:clamp(2.4rem,5vw,4.8rem);line-height:.95}.hero h1 span{color:var(--text);display:block}.hero p{max-width:44rem;color:var(--text-dim);margin-top:1rem;font-size:1rem;line-height:1.8}.hero__stats{gap:1rem;padding:1.5rem;display:grid}.stat-block{border:1px solid var(--border);background:#22201db8;border-radius:14px;padding:1rem}.stat-block__value{color:var(--text-bright);font-size:1.8rem;font-weight:600;display:block}.stat-block__label{color:var(--text-muted);font-family:var(--font-mono), monospace;letter-spacing:.08em;text-transform:uppercase;margin-top:.35rem;font-size:.72rem}.chapter-section{margin-top:1.5rem}.section-head{justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1rem;display:flex}.section-head h2{color:var(--text-bright);font-size:1.4rem}.chapter-grid{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:1rem;display:grid}.chapter-card{flex-direction:column;min-height:100%;padding:1.5rem;display:flex}.chapter-card__header{justify-content:space-between;align-items:flex-start;gap:1rem;margin-bottom:1rem;display:flex}.chapter-card h3{color:var(--text-bright);font-size:1.2rem}.chapter-card__count{color:var(--text-muted);font-size:.72rem;font-family:var(--font-mono), monospace;letter-spacing:.08em;text-transform:uppercase}.lesson-list{flex-direction:column;gap:.35rem;display:flex}.lesson-link{color:var(--text-dim);border:1px solid #0000;border-radius:12px;grid-template-columns:auto 1fr auto;align-items:center;gap:.75rem;padding:.9rem .95rem;transition:border-color .16s,background .16s,color .16s,transform .16s;display:grid}.lesson-link:hover{color:var(--text-bright);border-color:var(--border-strong);background:#22201db3;transform:translateY(-1px)}.lesson-link__num,.lesson-link__arrow{font-family:var(--font-mono), monospace;color:var(--text-muted);font-size:.78rem}.tag-arch{color:var(--accent)}.tag-tools{color:var(--green)}.tag-agents,.tag-net{color:var(--blue)}.tag-ui,.tag-meta{color:var(--yellow)}.tag-infra{color:var(--text-dim)}.tag-leak{color:var(--red)}.lesson-page{min-height:100vh}.lesson-wrap{width:min(920px,100% - 2rem);margin:0 auto;padding:1.25rem 0 5rem}.lesson-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem;margin:1rem 0 1.5rem;display:flex}.lesson-toolbar__crumbs{color:var(--text-dim);font-family:var(--font-mono), monospace;flex-wrap:wrap;align-items:center;gap:.6rem;font-size:.76rem;display:flex}.lesson-toolbar__crumbs a:hover,.lesson-source a:hover,.lesson-nav-card:hover{color:var(--text-bright)}.lesson-source{color:var(--text-dim);font-family:var(--font-mono), monospace;align-items:center;gap:.5rem;padding:.7rem .95rem;font-size:.76rem;display:inline-flex}.lesson-content{padding:0 0 1rem;font-size:15px;line-height:1.75}.lesson-content .header,.lesson-content header{border:1px solid var(--border);background:linear-gradient(#1a1816f5,#22201deb);border-radius:16px;margin-bottom:2rem;padding:2rem}.lesson-content .header h1,.lesson-content header h1{color:var(--text-bright);letter-spacing:-.03em;font-size:clamp(1.9rem,4vw,3rem);line-height:1.08}.lesson-content .header p,.lesson-content header p{color:var(--text-dim);margin-top:.8rem;font-size:1rem}.lesson-content .lesson-tag{background:var(--accent);color:var(--bg);letter-spacing:.08em;text-transform:uppercase;font-size:.72rem;font-weight:700;font-family:var(--font-mono), monospace;border-radius:999px;margin-bottom:1rem;padding:.2rem .55rem;display:inline-flex}.lesson-content p,.lesson-content li,.lesson-content td{color:var(--text)}.lesson-content p,.lesson-content ul,.lesson-content ol,.lesson-content table,.lesson-content details,.lesson-content .callout,.lesson-content .diagram-wrap,.lesson-content .phase-grid,.lesson-content pre{margin:1rem 0}.lesson-content h2,.lesson-content h3,.lesson-content h4{color:var(--text-bright);line-height:1.3}.lesson-content h3{margin-top:1.8rem;font-size:1.1rem}.lesson-content h4{color:var(--text);margin-top:1.1rem;font-size:.95rem}.lesson-content .section-title{border-bottom:1px solid var(--border);color:var(--text-bright);align-items:center;gap:.6rem;margin:2.4rem 0 1rem;padding-bottom:.55rem;font-size:1.2rem;font-weight:600;display:flex}.lesson-content .section-title .num,.lesson-content .section-title .icon,.lesson-content .phase-num,.lesson-content .callout-label{color:var(--accent);font-family:var(--font-mono), monospace;letter-spacing:.08em;text-transform:uppercase;font-size:.76rem}.lesson-content code{border:1px solid var(--border);color:var(--accent);font-family:var(--font-mono), monospace;background:#22201de6;border-radius:6px;padding:.1rem .35rem;font-size:.82rem}.lesson-content pre{border:1px solid var(--border);background:#1a1816f5;border-radius:16px;padding:1rem 1.1rem;overflow-x:auto}.lesson-content pre code{color:var(--text);background:0 0;border:none;padding:0;font-size:.79rem;line-height:1.75}.lesson-content .cm{color:var(--text-muted);font-style:italic}.lesson-content .kw,.lesson-content .fn,.lesson-content .ty{color:var(--blue)}.lesson-content .op,.lesson-content .num{color:var(--yellow)}.lesson-content .str{color:#8aab7c}.lesson-content .callout{border:1px solid var(--border);background:#1a1816f5;border-left-width:3px;border-radius:14px;padding:1rem 1.1rem}.lesson-content .callout.info{border-left-color:var(--blue)}.lesson-content .callout.tip{border-left-color:var(--green)}.lesson-content .callout.warn,.lesson-content .callout.warning{border-left-color:var(--yellow)}.lesson-content .callout.error,.lesson-content .callout.danger{border-left-color:var(--red)}.lesson-content .phase-grid{border:1px solid var(--border);border-radius:14px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1px;display:grid;overflow:hidden}.lesson-content .phase-card{border-top:3px solid var(--border);background:#1a1816f5;padding:1rem}.lesson-content .phase-card.p1{border-top-color:var(--accent)}.lesson-content .phase-card.p2{border-top-color:var(--green)}.lesson-content .phase-card.p3{border-top-color:var(--blue)}.lesson-content .phase-card.p4{border-top-color:var(--yellow)}.lesson-content .phase-card.p5{border-top-color:var(--text-dim)}.lesson-content .phase-card.p6{border-top-color:#6e8a9a}.lesson-content .diagram-wrap,.lesson-content .quiz-section,.lesson-content .quiz-container{border:1px solid var(--border);background:#1a1816f5;border-radius:16px;padding:1.2rem;overflow-x:auto}.lesson-content details{border:1px solid var(--border);background:#1a1816d1;border-radius:14px;padding:1rem 1.1rem}.lesson-content details summary{cursor:pointer;color:var(--text-bright);font-weight:600}.lesson-content details .details-body{margin-top:.9rem}.lesson-content table{border-collapse:collapse;width:100%;font-size:.88rem}.lesson-content th,.lesson-content td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;padding:.75rem .85rem}.lesson-content th{color:var(--text-bright);letter-spacing:.08em;text-transform:uppercase;font-size:.72rem;font-family:var(--font-mono), monospace;background:#22201dc2}.lesson-content ul,.lesson-content ol{padding-left:1.4rem}.lesson-content strong{color:var(--text-bright)}.lesson-content em{color:var(--yellow)}.lesson-content a{color:var(--accent);-webkit-text-decoration:underline #c47a504d;text-decoration:underline #c47a504d}.lesson-content a:hover{-webkit-text-decoration-color:var(--accent);text-decoration-color:var(--accent)}.lesson-content hr{border:none;border-top:1px solid var(--border)}.lesson-content .page,.lesson-content .page-wrapper,.lesson-content .container{flex-direction:column;gap:1.4rem;display:flex}.lesson-content section{scroll-margin-top:6rem}.lesson-content .lesson-header,.lesson-content .hero,.lesson-content>.page>h1:first-child,.lesson-content>.page-wrapper>h1:first-child{margin-bottom:0}.lesson-content .page>h1:first-child,.lesson-content .page-wrapper>h1:first-child{color:var(--text-bright);letter-spacing:-.03em;font-size:clamp(2rem,4vw,3rem);line-height:1.08}.lesson-content .lesson-header,.lesson-content .hero{border:1px solid var(--border);box-shadow:var(--shadow);background:linear-gradient(#1c1917f5,#12100feb);border-radius:20px;flex-direction:column;gap:1rem;padding:1.8rem;display:flex}.lesson-content .breadcrumb,.lesson-content .lesson-label,.lesson-content .subtitle,.lesson-content .lesson-meta,.lesson-content .lesson-num{color:var(--text-dim)}.lesson-content .breadcrumb,.lesson-content .lesson-label,.lesson-content .lesson-num,.lesson-content .section-label{font-family:var(--font-mono), monospace;letter-spacing:.08em;text-transform:uppercase;font-size:.76rem}.lesson-content .breadcrumb{flex-wrap:wrap;align-items:center;gap:.5rem;display:flex}.lesson-content .lesson-label,.lesson-content .lesson-num{border:1px solid color-mix(in srgb, var(--accent) 28%, transparent);width:fit-content;color:var(--accent);background:#c47a5014;border-radius:999px;margin-top:.9rem;padding:.25rem .65rem;display:inline-flex}.lesson-content .subtitle,.lesson-content .lesson-meta{font-size:1rem;line-height:1.8}.lesson-content .progress-bar-wrap{background:#ffffff0a;border-radius:999px;height:.45rem;margin-top:1.2rem;overflow:hidden}.lesson-content .progress-bar{border-radius:inherit;background:linear-gradient(90deg, var(--accent), var(--yellow));width:min(38%,15rem);height:100%}.lesson-content .toc,.lesson-content .card,.lesson-content .tool-card,.lesson-content .col-card,.lesson-content .compare-col,.lesson-content .mode-card,.lesson-content .layer-card,.lesson-content .chip,.lesson-content .cat-card,.lesson-content .transport-card,.lesson-content .species-card,.lesson-content .stack-layer,.lesson-content .vbadge{border:1px solid var(--border);background:linear-gradient(#1c1917e6,#141211e0);border-radius:18px}.lesson-content .toc,.lesson-content .card,.lesson-content .tool-card,.lesson-content .col-card,.lesson-content .compare-col,.lesson-content .mode-card,.lesson-content .layer-card,.lesson-content .chip,.lesson-content .cat-card,.lesson-content .transport-card,.lesson-content .species-card{padding:1.1rem 1.15rem}.lesson-content .toc h3,.lesson-content .toc h4{margin-bottom:.8rem}.lesson-content .toc ol,.lesson-content .toc ul{margin:0;padding-left:1.2rem}.lesson-content .toc li+li{margin-top:.45rem}.lesson-content .card-grid,.lesson-content .tool-grid,.lesson-content .two-col,.lesson-content .compare,.lesson-content .validator-grid,.lesson-content .priority-stack{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.9rem;display:grid}.lesson-content .stack-layer,.lesson-content .vbadge{align-items:flex-start;gap:.9rem;padding:1rem 1.05rem;display:flex}.lesson-content .stack-rank,.lesson-content .takeaway-num,.lesson-content .cat-num{width:1.9rem;height:1.9rem;font-family:var(--font-mono), monospace;border-radius:999px;flex:none;justify-content:center;align-items:center;font-size:.82rem;font-weight:700;display:inline-flex}.lesson-content .badge,.lesson-content .event-badge,.lesson-content .kb-ctx,.lesson-content .file-tag{border:1px solid color-mix(in srgb, var(--border-strong) 78%, transparent);font-family:var(--font-mono), monospace;letter-spacing:.06em;text-transform:uppercase;background:#22201dcc;border-radius:999px;align-items:center;gap:.35rem;padding:.22rem .55rem;font-size:.7rem;display:inline-flex}.lesson-content .takeaways{border:1px solid var(--border);background:linear-gradient(#1c1917f5,#12100feb);border-radius:20px;padding:1.2rem}.lesson-content .takeaway-item{border-top:1px solid #ffffff0d;grid-template-columns:auto 1fr;align-items:flex-start;gap:.9rem;padding:.95rem 0;display:grid}.lesson-content .takeaway-item:first-of-type{border-top:none}.lesson-content .quiz-q{border-bottom:1px solid #ffffff0f;margin-bottom:1.7rem;padding-bottom:1.7rem}.lesson-content .quiz-q:last-of-type{border-bottom:none;margin-bottom:0;padding-bottom:0}.lesson-content .q-text,.lesson-content .question-text,.lesson-content .quiz-card>.quiz-q,.lesson-content .quiz-card>h4{color:var(--text-bright);margin-bottom:1rem;font-size:1.08rem;font-weight:700;line-height:1.55}.lesson-content .q-num,.lesson-content .opt-letter,.lesson-content .opt-key{font-family:var(--font-mono), monospace;font-size:.88rem}.lesson-content .options{gap:.7rem;display:grid}.lesson-content .quiz,.lesson-content .quiz-options{gap:1.7rem;display:grid}.lesson-content .quiz-card{border-bottom:1px solid #ffffff0f;padding-bottom:1.7rem}.lesson-content .quiz-card:last-child{border-bottom:none;padding-bottom:0}.lesson-content .option-label,.lesson-content .quiz-opt{width:100%;color:var(--text);cursor:pointer;background:#181614b8;border:1px solid #ffffff14;border-radius:18px;align-items:flex-start;gap:.8rem;padding:1rem 1.05rem;transition:border-color .16s,background .16s,transform .16s,box-shadow .16s;display:flex}.lesson-content .quiz-opt{appearance:none;text-align:left}.lesson-content .option-label input{appearance:none;background:0 0;border:1.5px solid #ffffffd1;border-radius:999px;flex:none;width:1rem;height:1rem;margin-top:.22rem;transition:border-color .16s,box-shadow .16s,background .16s;box-shadow:inset 0 0 #fff0}.lesson-content .option-label:hover,.lesson-content .quiz-opt:hover:not(:disabled){background:#22201dd1;border-color:#ffffff24;transform:translateY(-1px);box-shadow:0 18px 36px #0000002e}.lesson-content .quiz-opt.is-selected{border-color:color-mix(in srgb, var(--accent) 42%, var(--border));background:#25201ceb}.lesson-content .option-label:has(input:checked){border-color:color-mix(in srgb, var(--accent) 42%, var(--border));background:#25201ceb}.lesson-content .option-label input:checked{border-color:var(--accent);background:var(--accent);box-shadow:inset 0 0 0 3px #181614f0}.lesson-content .opt-letter,.lesson-content .opt-key{color:var(--text-dim);min-width:1.1rem}.lesson-content .option-label.reveal-correct,.lesson-content .quiz-opt.reveal-correct{border-color:color-mix(in srgb, var(--green) 52%, var(--border));background:#6e946814}.lesson-content .option-label.selected-correct,.lesson-content .quiz-opt.selected-correct{border-color:var(--green);color:#a8c79f;background:#6e946824}.lesson-content .option-label.selected-wrong,.lesson-content .quiz-opt.selected-wrong{border-color:var(--red);color:#db908c;background:#c45b5424}.lesson-content .quiz-btn,.lesson-content .check-btn{color:var(--text);cursor:pointer;background:#161412e6;border:1px solid #ffffff1f;border-radius:999px;margin-top:1rem;padding:.72rem 1.1rem;font-size:.92rem;font-weight:500;transition:border-color .16s,color .16s,background .16s}.lesson-content .quiz-btn:hover:not(:disabled),.lesson-content .check-btn:hover:not(:disabled){border-color:var(--accent);color:var(--text-bright);background:#1e1b18f2}.lesson-content .quiz-btn:disabled,.lesson-content .check-btn:disabled{opacity:.8;cursor:default}.lesson-content .quiz-feedback,.lesson-content .feedback-msg{border:1px solid var(--border);border-radius:14px;margin-top:.9rem;padding:.95rem 1rem;font-size:.92rem;line-height:1.7;display:none}.lesson-content .quiz-feedback.show,.lesson-content .feedback-msg.show{display:block}.lesson-content .quiz-feedback.correct,.lesson-content .feedback-msg.correct{border-color:var(--green);color:#a8c79f;background:#6e94681f}.lesson-content .quiz-feedback.wrong,.lesson-content .feedback-msg.wrong{border-color:var(--red);color:#db908c;background:#c45b541f}.lesson-content .quiz-score{text-align:center;background:linear-gradient(#1c1917f0,#12100feb);border:1px solid #ffffff14;border-radius:18px;margin-top:1.5rem;padding:1.25rem;display:none}.lesson-content .quiz-score.show{display:block}.lesson-content .score-big{color:var(--accent);font-size:clamp(2rem,4vw,2.8rem);font-weight:700;font-family:var(--font-mono), monospace;display:block}.lesson-content .quiz-section{background:0 0;border:none;padding:0;overflow:visible}.lesson-content .quiz-section>h2{margin-bottom:.9rem}.lesson-content .quiz-section>p{color:var(--text-dim);margin:0 0 1.1rem}.lesson-content .mermaid svg{max-width:100%;height:auto}.lesson-nav{grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;margin-top:2rem;display:grid}.lesson-nav-card{min-height:100%;padding:1rem;transition:border-color .16s,transform .16s,color .16s}.lesson-nav-card:hover{border-color:var(--border-strong);transform:translateY(-2px)}.lesson-nav-card--empty{opacity:.35}.lesson-nav-card__label{color:var(--text-muted);font-family:var(--font-mono), monospace;letter-spacing:.08em;text-transform:uppercase;font-size:.72rem}.lesson-nav-card__title{color:var(--text-bright);margin-top:.45rem;font-weight:600;display:block}.lesson-nav-card__meta{color:var(--text-dim);margin-top:.4rem;font-size:.86rem;display:block}@media (max-width:900px){.hero,.lesson-nav{grid-template-columns:1fr}}@media (max-width:640px){.course-shell,.lesson-wrap{width:min(100% - 1rem,100%)}.hero__panel,.chapter-card{padding:1.2rem}.lesson-content .header,.lesson-content header,.lesson-content .diagram-wrap,.lesson-content .quiz-container,.lesson-content pre,.lesson-content .lesson-header,.lesson-content .hero,.lesson-content .toc,.lesson-content .card,.lesson-content .tool-card,.lesson-content .col-card,.lesson-content .compare-col,.lesson-content .mode-card,.lesson-content .layer-card,.lesson-content .chip,.lesson-content .takeaways,.lesson-content .quiz-score{border-radius:14px;padding:1rem}.lesson-content .option-label,.lesson-content .quiz-opt{border-radius:16px;padding:.9rem}.lesson-content .card-grid,.lesson-content .tool-grid,.lesson-content .two-col,.lesson-content .compare,.lesson-content .validator-grid,.lesson-content .priority-stack{grid-template-columns:1fr}}