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var(--border-color);background:var(--bg-secondary);border-radius:12px;grid-template-columns:repeat(4,1fr);gap:0;margin-bottom:56px;display:grid}@media (max-width:720px){.meta-strip{grid-template-columns:repeat(2,1fr)}}.meta-cell{border-right:1px solid var(--border-color);padding:16px 20px}@media (min-width:721px){.meta-cell:last-child{border-right:none}}@media (max-width:720px){.meta-cell:nth-child(2n){border-right:none}.meta-cell:nth-child(-n+2){border-bottom:1px solid var(--border-color)}}.meta-label{font-family:var(--font-mono);color:var(--text-muted);letter-spacing:.12em;text-transform:uppercase;align-items:center;gap:6px;margin-bottom:6px;font-size:10px;display:flex}.meta-value{font-family:var(--font-display);letter-spacing:-.01em;align-items:baseline;gap:4px;font-size:18px;font-weight:500;display:flex}.meta-value .unit{color:var(--text-muted);font-size:12px;font-weight:400;font-family:var(--font-body);letter-spacing:0}.meta-value.accent{color:var(--accent-primary)}.meta-progress{align-items:center;gap:10px;display:flex}.prose{color:var(--text-secondary);max-width:68ch;font-size:17px;line-height:1.65}.prose>*+*{margin-top:1.1em}.prose strong{font-weight:600}.prose em,.prose strong{color:var(--text-primary)}.prose em{font-style:italic}.prose code{font-family:var(--font-mono);background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);border-radius:5px;padding:2px 6px;font-size:.92em}.prose a{color:var(--accent-primary);border-bottom:1px solid var(--accent-primary)}@supports (color:color-mix(in lab,red,red)){.prose a{border-bottom:1px solid color-mix(in oklab,var(--accent-primary) 40%,transparent)}}.prose a:hover{border-bottom-color:var(--accent-primary)}.prose ol,.prose ul{color:var(--text-secondary);padding-left:1.5rem}.prose li{margin-bottom:6px}.prose blockquote{border-left:3px solid var(--accent-primary);color:var(--text-secondary);padding-left:18px;font-style:italic}.lesson-h2{font-family:var(--font-display);letter-spacing:-.02em;color:var(--text-primary);align-items:baseline;gap:12px;margin:64px 0 8px;scroll-margin-top:100px;font-size:clamp(26px,2.4vw,32px);font-weight:500;line-height:1.15;display:flex}.lesson-h2 .h2-num{font-family:var(--font-mono);color:var(--accent-primary);letter-spacing:.08em;flex-shrink:0;font-size:13px;font-weight:500}.h2-sub{color:var(--text-muted);margin-bottom:28px;font-size:15px}.lesson-h3{font-family:var(--font-display);letter-spacing:-.01em;color:var(--text-primary);margin:32px 0 8px;font-size:1.125rem;font-weight:500}.callout{border:1px solid var(--border-color);background:var(--bg-secondary);border-radius:12px;grid-template-columns:36px 1fr;gap:16px;margin:32px 0;padding:22px 24px 22px 22px;display:grid;position:relative}.callout:before{content:"";background:var(--accent-primary);border-radius:2px 0 0 2px;width:2px;position:absolute;top:0;bottom:0;left:0}.callout-title{font-family:var(--font-mono);color:var(--accent-primary);letter-spacing:.12em;text-transform:uppercase;margin-bottom:4px;font-size:11px;font-weight:600}.callout-body{color:var(--text-secondary);font-size:15px;line-height:1.55}.callout-body strong{color:var(--text-primary);font-weight:600}.codeblock{border:1px solid var(--border-color);background:var(--bg-secondary);border-radius:10px;margin:24px 0;overflow:hidden}.codeblock-head{border-bottom:1px solid var(--border-color);background:var(--bg-tertiary);font-family:var(--font-mono);color:var(--text-muted);letter-spacing:.08em;justify-content:space-between;align-items:center;padding:10px 14px;font-size:11px;display:flex}.codeblock pre{font-family:var(--font-mono);color:var(--text-primary);margin:0;padding:16px 18px;font-size:13px;line-height:1.6;overflow-x:auto}.codeblock pre code{font-size:inherit;color:inherit;background:0 0;border:none;border-radius:0;padding:0}.compare{border:1px solid var(--border-color);background:var(--bg-secondary);border-radius:12px;width:100%;margin:28px 0;overflow:hidden}.compare table{border-collapse:collapse;width:100%}.compare td,.compare th{text-align:left;border-bottom:1px solid var(--border-color);border-right:1px solid var(--border-color);color:var(--text-secondary);padding:14px 18px;font-size:14px}.compare td:last-child,.compare th:last-child{border-right:none}.compare tr:last-child td{border-bottom:none}.compare thead th{background:var(--bg-tertiary);font-family:var(--font-mono);color:var(--text-muted);letter-spacing:.1em;text-transform:uppercase;font-size:11px;font-weight:500}.compare td strong{color:var(--text-primary);font-weight:600}.compare code{font-family:var(--font-mono);background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);border-radius:4px;padding:2px 5px;font-size:.88em}.lesson-nav{border-top:1px solid var(--border-color);grid-template-columns:1fr 1fr;gap:16px;margin-top:56px;padding-top:32px;display:grid}@media (max-width:640px){.lesson-nav{grid-template-columns:1fr}}.nav-card{border:1px solid var(--border-color);background:var(--bg-secondary);border-radius:12px;padding:18px 22px;transition:border-color .2s,transform .2s;display:block}.nav-card:hover{border-color:var(--text-muted);transform:translateY(-2px)}.nav-card.next{text-align:right}.nav-card .nav-dir{font-family:var(--font-mono);color:var(--text-muted);letter-spacing:.12em;text-transform:uppercase;align-items:center;gap:6px;margin-bottom:6px;font-size:11px;display:flex}.nav-card.next .nav-dir{justify-content:flex-end}.nav-card .nav-title{font-family:var(--font-display);letter-spacing:-.01em;color:var(--text-primary);font-size:16px;font-weight:500}.toc-right{align-self:start;font-size:13px;position:sticky;top:96px}.toc-right .toc-label{font-family:var(--font-mono);color:var(--text-muted);letter-spacing:.14em;text-transform:uppercase;border-bottom:1px solid var(--border-soft);margin-bottom:14px;padding-bottom:12px;font-size:10px}.toc-right ul{flex-direction:column;gap:8px;list-style:none;display:flex}.toc-right a{color:var(--text-muted);border-left:1px solid #0000;margin-left:-12px;padding:2px 0 2px 12px;line-height:1.4;transition:color .2s,border-color .2s;display:block}.toc-right a.active,.toc-right a:hover{color:var(--text-primary)}.toc-right a.active{border-left-color:var(--accent-primary)}.levels-page{padding-top:96px;padding-bottom:80px}.levels-page-hero{margin-bottom:56px}.levels-page-title{font-family:var(--font-display);letter-spacing:-.035em;color:var(--text-primary);margin-block:0 24px;font-size:clamp(2.75rem,6vw,4rem);font-weight:600;line-height:1}.levels-page-sub{color:var(--text-secondary);max-width:680px;font-size:1.125rem;line-height:1.55}.levels-list{border-top:1px solid var(--border-color);flex-direction:column;display:flex}.level-row{border-bottom:1px solid var(--border-color);grid-template-columns:80px 1fr 1.4fr;align-items:start;gap:0 2rem;padding-block:40px;display:grid}.level-num-bg{font-family:var(--font-display);letter-spacing:-.04em;color:var(--accent-primary);opacity:.4;-webkit-user-select:none;user-select:none;font-size:3rem;font-weight:500;line-height:1}.level-meta-row{align-items:center;gap:8px;margin-bottom:10px;display:flex}.level-meta-label{font-family:var(--font-mono);color:var(--text-muted);font-size:.6875rem}.level-title{font-family:var(--font-display);letter-spacing:-.02em;color:var(--text-primary);margin-block:0 12px;font-size:1.875rem;font-weight:600;line-height:1.1}.level-desc{color:var(--text-secondary);margin-bottom:18px;font-size:.90625rem;line-height:1.6}.level-cta{font-size:.875rem}.level-lessons-panel{background:var(--border-color);border:1px solid var(--border-color);border-radius:6px;flex-direction:column;gap:1px;display:flex;overflow:hidden}.level-lesson-item{background:var(--bg-secondary);cursor:pointer;align-items:center;gap:14px;padding:10px 14px;font-size:.84375rem;transition:background .1s;display:flex}.level-lesson-item:hover{background:var(--bg-tertiary)}.lesson-num{font-family:var(--font-mono);color:var(--text-muted);min-width:1.5rem;font-size:.6875rem}.lesson-title-text{color:var(--text-primary);flex:1;line-height:1.35}.lesson-type-badge{font-family:var(--font-mono);letter-spacing:.05em;white-space:nowrap;border:1px solid #0000;border-radius:999px;padding:.2rem .5rem;font-size:.625rem;font-weight:600}.lesson-type-lesson{color:oklch(65% .14 240);background:oklch(55% .14 240/.14);border-color:oklch(55% .14 240/.28)}.lesson-type-simulation{color:oklch(68% .18 145);background:oklch(58% .18 145/.14);border-color:oklch(58% .18 145/.28)}.lesson-type-quiz{color:oklch(66% .15 300);background:oklch(56% .15 300/.14);border-color:oklch(56% .15 300/.28)}.lesson-type-dragdrop{color:oklch(67% .16 40);background:oklch(57% .16 40/.14);border-color:oklch(57% .16 40/.28)}.lesson-type-terminal{color:oklch(66% .12 150);background:oklch(56% .12 150/.14);border-color:oklch(56% .12 150/.28)}@media (max-width:960px){.level-row{grid-template-rows:auto auto;grid-template-columns:60px 1fr}.level-lessons-panel{grid-column:1/-1;margin-top:24px}}@media (max-width:600px){.level-row{grid-template-columns:1fr}.level-num-bg{display:none}}.osi-stack{border:1px solid var(--border-color);border-radius:14px;flex-direction:column;margin:28px 0 24px;display:flex;overflow:hidden}.osi-layer{background:var(--lc);grid-template-columns:52px 1fr auto;align-items:center;gap:0 20px;padding:14px 20px;display:grid}@supports (color:color-mix(in lab,red,red)){.osi-layer{background:color-mix(in oklab,var(--lc) 6%,var(--bg-secondary))}}.osi-layer{border-left:3px solid var(--lc);cursor:default;transition:background .15s}.osi-layer+.osi-layer{border-top:1px solid var(--border-soft)}.osi-layer:hover{background:var(--lc)}@supports (color:color-mix(in lab,red,red)){.osi-layer:hover{background:color-mix(in oklab,var(--lc) 13%,var(--bg-secondary))}}.osi-num{font:700 20px/1 var(--font-display);color:var(--lc);text-align:center}.osi-name{font:600 14px/1.2 var(--font-display);color:var(--text-primary);margin-bottom:3px}.osi-role{color:var(--text-muted);font-size:12.5px;line-height:1.4}.osi-protos{flex-wrap:wrap;justify-content:flex-end;gap:4px;max-width:200px;display:flex}.osi-protos .chip{font-family:var(--font-mono);padding:3px 7px;font-size:11px}.mnemonic{border:1px solid var(--border-color);background:var(--bg-secondary);border-radius:12px;margin:28px 0;padding:20px 24px}.mnemonic-label{font:600 10px/1 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);margin-bottom:12px}.mnemonic-phrase{font:700 20px/1.4 var(--font-display);color:var(--text-primary);letter-spacing:-.01em;margin-bottom:8px}.mnemonic-phrase .l{color:var(--lc,var(--accent-primary))}.mnemonic-map{font:400 12px/1.8 var(--font-mono);color:var(--text-secondary)}.encap-diagram{flex-direction:column;gap:4px;margin:28px 0 24px;display:flex}.encap-row{border:1px solid var(--border-color);border-radius:9px;align-items:stretch;min-height:40px;display:flex;overflow:hidden}.encap-label{width:80px;font:500 10px/1 var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);border-right:1px solid var(--border-soft);background:var(--bg-tertiary);flex-shrink:0;padding:0 12px}.encap-header,.encap-label{align-items:center;display:flex}.encap-header{font:700 11px/1 var(--font-mono);letter-spacing:.06em;white-space:nowrap;background:var(--hc);justify-content:center;padding:0 13px}@supports (color:color-mix(in lab,red,red)){.encap-header{background:color-mix(in oklab,var(--hc) 12%,var(--bg-secondary))}}.encap-header{color:var(--hc);border-right:1px solid var(--hc)}@supports (color:color-mix(in lab,red,red)){.encap-header{border-right:1px solid color-mix(in oklab,var(--hc) 22%,var(--border-color))}}.encap-data{color:var(--text-secondary);background:var(--bg-secondary);flex:1;padding:0 16px;font-size:13px}.encap-data,.encap-trailer{align-items:center;display:flex}.encap-trailer{font:700 11px/1 var(--font-mono);letter-spacing:.06em;white-space:nowrap;background:oklch(70% .19 25);justify-content:center;padding:0 13px}@supports (color:color-mix(in lab,red,red)){.encap-trailer{background:color-mix(in oklab,oklch(70% .19 25) 10%,var(--bg-secondary))}}.encap-trailer{color:oklch(70% .19 25);border-left:1px solid oklch(70% .19 25)}@supports (color:color-mix(in lab,red,red)){.encap-trailer{border-left:1px solid color-mix(in oklab,oklch(70% .19 25) 20%,var(--border-color))}}.concept-stack{flex-direction:column;gap:20px;margin:32px 0 24px;display:flex}.concept{border:1px solid var(--border-color);background:var(--bg-secondary);border-radius:14px;transition:border-color .25s,transform .25s;position:relative;overflow:hidden}.concept:before{content:"";background:var(--c,var(--accent-primary));width:3px;position:absolute;top:0;bottom:0;left:0}.concept:hover{border-color:var(--c,var(--accent-primary))}@supports (color:color-mix(in lab,red,red)){.concept:hover{border-color:color-mix(in oklab,var(--c,var(--accent-primary)) 50%,var(--border-color))}}.concept:hover{transform:translateY(-2px)}.concept-lan{--c:var(--scope-1)}.concept-wan{--c:var(--scope-2)}.concept-internet{--c:var(--scope-3)}.concept-inner{grid-template-columns:80px minmax(0,1fr);gap:24px;padding:28px 28px 26px;display:grid}.concept-icon{border:1px solid var(--c,var(--accent-primary));border-radius:12px;width:64px;height:64px}@supports (color:color-mix(in lab,red,red)){.concept-icon{border:1px solid color-mix(in oklab,var(--c,var(--accent-primary)) 35%,var(--border-color))}}.concept-icon{background:var(--c,var(--accent-primary))}@supports (color:color-mix(in lab,red,red)){.concept-icon{background:color-mix(in oklab,var(--c,var(--accent-primary)) 10%,var(--bg-tertiary))}}.concept-icon{color:var(--c,var(--accent-primary));flex-shrink:0;place-items:center;display:grid}.concept-head{flex-wrap:wrap;align-items:baseline;gap:14px;margin-bottom:6px;display:flex}.concept-abbrev{font-family:var(--font-display);letter-spacing:-.025em;color:var(--text-primary);font-size:28px;font-weight:500;line-height:1}.concept-fullname{font-family:var(--font-mono);color:var(--c,var(--accent-primary));letter-spacing:.08em;text-transform:uppercase;font-size:11px}.concept-def{color:var(--text-secondary);max-width:60ch;margin-bottom:22px;font-size:15px;line-height:1.6}.concept-def strong{color:var(--text-primary);font-weight:600}.concept-grid{border-top:1px solid var(--border-soft);grid-template-columns:1fr 1fr;align-items:center;gap:24px;padding-top:18px;display:grid}.concept-group-label{font-family:var(--font-mono);color:var(--text-muted);letter-spacing:.14em;text-transform:uppercase;margin-bottom:10px;font-size:10px}.chip-row{flex-wrap:wrap;gap:6px;display:flex}.chip{border:1px solid var(--border-color);background:var(--bg-tertiary);color:var(--text-secondary);border-radius:6px;padding:5px 10px;font-size:13px}.trait-list{flex-direction:column;gap:6px;list-style:none;display:flex}.trait-list li{color:var(--text-secondary);align-items:center;gap:8px;font-size:14px;display:flex}.trait-list li .pip{background:var(--c,var(--accent-primary));border-radius:50%;flex-shrink:0;width:5px;height:5px}.diagram{border:1px solid var(--border-color);background:var(--bg-secondary);border-radius:14px;margin:40px 0;padding:32px;position:relative;overflow:hidden}.diagram:after{content:"";background-image:radial-gradient(var(--grid-dot) 1px,transparent 1px);pointer-events:none;background-size:24px 24px;position:absolute;inset:0;-webkit-mask-image:linear-gradient(#0000,#000 20% 80%,#0000);mask-image:linear-gradient(#0000,#000 20% 80%,#0000)}.diagram-caption{font-family:var(--font-mono);color:var(--text-muted);letter-spacing:.1em;text-transform:uppercase;align-items:center;gap:8px;margin-bottom:20px;font-size:11px;display:flex;position:relative}.diagram-caption:before{content:"";background:var(--accent-primary);border-radius:2px;width:6px;height:6px}.diagram svg{width:100%;height:auto;position:relative}@media (max-width:640px){.concept-inner{grid-template-columns:1fr;gap:16px;padding:24px}.concept-grid{grid-template-columns:1fr;gap:14px}}.about-page{padding-top:120px;padding-bottom:80px;position:relative;overflow:hidden}.about-inner{z-index:2;position:relative}.about-hero{text-align:center;max-width:56ch;margin-inline:auto;padding-bottom:56px}.about-title{font:700 clamp(2.4rem,5.5vw,4rem)/1.12 var(--font-display);letter-spacing:-.025em;color:var(--text-primary);margin-block:12px 18px}.about-lede{color:var(--text-secondary);max-width:50ch;margin-inline:auto;font-size:1.0625rem;line-height:1.72}.about-principles{border-top:1px solid var(--border-color);grid-template-columns:repeat(3,1fr);gap:20px;padding-block:48px;display:grid}.about-card{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:16px;flex-direction:column;gap:12px;padding:28px;transition:border-color .2s,transform .2s;display:flex}.about-card:hover{border-color:var(--text-muted);transform:translateY(-2px)}.about-card-num{letter-spacing:.1em;color:var(--accent-primary);font-size:.72rem}.about-card-icon{color:var(--accent-primary);opacity:.9;margin-block:4px 2px}.about-card-title{font:700 1.05rem/1.3 var(--font-display);letter-spacing:-.01em;color:var(--text-primary);margin-top:4px}.about-card-body{color:var(--text-secondary);font-size:.9rem;line-height:1.7}.about-oss{border-top:1px solid var(--border-color);grid-template-columns:1fr auto;align-items:center;gap:40px;padding-block:48px;display:grid}.about-oss-title{font:700 clamp(1.4rem,2.8vw,2rem)/1.2 var(--font-display);letter-spacing:-.015em;color:var(--text-primary);margin-bottom:10px}.about-oss-body{color:var(--text-secondary);max-width:58ch;font-size:.9375rem;line-height:1.68}.about-oss-actions{flex-direction:column;flex-shrink:0;align-items:flex-end;gap:10px;display:flex}.about-oss-badge{letter-spacing:.08em;color:var(--text-muted);background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:100px;padding:4px 12px;font-size:.72rem}.about-stack{border-top:1px solid var(--border-color);flex-wrap:wrap;align-items:center;gap:8px;padding-block:32px;display:flex}.about-stack-label{letter-spacing:.1em;color:var(--text-muted);margin-right:4px;font-size:.72rem}@media (max-width:860px){.about-principles{grid-template-columns:1fr 1fr}.about-oss{grid-template-columns:1fr}.about-oss-actions{align-items:flex-start}}@media (max-width:540px){.about-principles{grid-template-columns:1fr}}@media (prefers-reduced-motion:reduce){*,:after,:before{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}