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var(--border);overflow-x:auto;flex-shrink:0;position:sticky;top:0;z-index:11;scrollbar-width:none}.section-strip::-webkit-scrollbar{display:none}.section-strip-item{font-family:'Space Mono',monospace;font-size:9px;letter-spacing:.12em;padding:5px 11px;border:1px solid var(--border);border-radius:20px;cursor:pointer;color:var(--text-muted);white-space:nowrap;transition:color .2s,border-color .2s,background .2s;flex-shrink:0;text-transform:uppercase;user-select:none}.section-strip-item:hover{color:var(--floor-color,var(--accent));border-color:var(--floor-color,var(--accent))}.section-strip-item.ss-done{background:rgba(255,255,255,.03)}.section-strip-item.ss-active{font-weight:500}.section-sticky-header{position:sticky;top:0;z-index:20;background:var(--surface);border-bottom:1px solid var(--border)}.section-sticky-header .section-progress-dots{padding:6px 24px 10px;border-top:1px solid 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clamp(1.25rem,3vw,1.75rem);margin:28px 0;border-radius:0 10px 10px 0;transition:box-shadow .3s ease,transform .3s ease;backdrop-filter:blur(10px)}.callout.focus{border-image:linear-gradient(180deg,var(--accent2),rgba(126,184,200,0.3)) 1;background:radial-gradient(ellipse 60% 80% at 0 50%,rgba(126,184,200,.06) 0,transparent 70%),rgba(126,184,200,.03)}.callout.warning{border-image:linear-gradient(180deg,#c87e7e,rgba(200,126,126,0.3)) 1;background:radial-gradient(ellipse 60% 80% at 0 50%,rgba(200,126,126,.06) 0,transparent 70%),rgba(200,126,126,.03)}.callout-label{font-family:'Space Mono',monospace;font-size:9px;letter-spacing:3px;color:var(--accent);margin-bottom:10px;text-transform:uppercase}.callout.focus .callout-label{color:var(--accent2)}.callout.warning .callout-label{color:var(--floor3)}.callout-text{font-size:14px;line-height:1.8;color:var(--text-dim)}.callout-icon-row{display:flex;align-items:center;gap:8px;margin-bottom:10px}.callout-icon{font-size:16px;line-height:1;flex-shrink:0}.callout-icon-row+.callout-text{margin-top:0}.callout-icon-row .callout-label{margin-bottom:0}.section-progress-dots{display:flex;gap:5px;padding:16px 24px 4px;justify-content:center;flex-wrap:wrap}.spd-dot{width:7px;height:7px;border-radius:50%;border:1.5px solid var(--border);background:0 0;cursor:pointer;transition:all .2s ease;flex-shrink:0;padding:8px;margin:-5px;background-clip:content-box;box-sizing:content-box}.spd-dot:hover{border-color:var(--floor-color,var(--accent));transform:scale(1.3)}.spd-dot.spd-done{background:rgba(74,222,128,.35);background-clip:content-box;border-color:rgba(74,222,128,.6)}.spd-dot.spd-current{background:var(--floor-color,var(--accent));background-clip:content-box;border-color:var(--floor-color,var(--accent));transform:scale(1.4);box-shadow:0 0 6px var(--floor-color,var(--accent))}.section-slide-in{animation:sectionSlideInFromRight .3s cubic-bezier(.4,0,.2,1) both}.section-slide-in-left{animation:sectionSlideInFromLeft .3s cubic-bezier(.4,0,.2,1) both}.section-slide-out-left{animation:sectionSlideOutToLeft .22s cubic-bezier(.4,0,.2,1) both;pointer-events:none}.section-slide-out-right{animation:sectionSlideOutToRight .22s cubic-bezier(.4,0,.2,1) both;pointer-events:none}.code-block{background:#050505;border:1px solid rgba(212,170,106,.1);border-radius:8px;margin:28px 0;overflow:hidden;box-shadow:0 16px 48px rgba(0,0,0,.6),0 4px 12px rgba(0,0,0,.4),inset 0 1px 0 rgba(255,255,255,.04),inset 0 0 0 1px rgba(212,170,106,.04)}.code-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid rgba(212,170,106,.08);background:rgba(212,170,106,.04)}.code-dots{display:flex;gap:6px}.code-dot{width:10px;height:10px;border-radius:50%;background:var(--border)}.code-lang{font-family:'Space Mono',monospace;font-size:10px;letter-spacing:2px;color:var(--text-muted)}.code-body{padding:20px;font-family:'Space Mono','IBM Plex Mono','Fira Code',monospace;font-size:13px;line-height:1.8;overflow-x:auto;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-variant-ligatures:none;font-feature-settings:"calt" 0,"liga" 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.quiz-opt-icon{display:none}.quiz-label{font-family:'Space Mono',monospace;font-size:9px;letter-spacing:3px;color:var(--floor-color,var(--accent));margin-bottom:16px}.quiz-question{font-size:16px;font-weight:700;color:var(--text);margin-bottom:20px;line-height:1.5}.quiz-options{display:flex;flex-direction:column;gap:10px}.quiz-option{background:rgba(255,255,255,.02);border:1px solid rgba(255,255,255,.07);border-radius:10px;box-shadow:inset 0 1px 0 rgba(255,255,255,.04),0 2px 8px rgba(0,0,0,.2);padding:16px 20px;text-align:left;cursor:pointer;font-size:14px;color:var(--text-dim);width:100%;font-family:'Space Grotesk',sans-serif;display:flex;align-items:center;transition:border-color .2s ease,box-shadow .2s ease,transform .15s ease,background .2s ease,opacity .3s ease}.quiz-block[data-quiz-state=unanswered] .quiz-option{animation:quizOptIn .32s ease both;animation-delay:calc(var(--i, 0) * .07s)}@keyframes 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