:root{--ink:#2D3748;--background:#F7FAFC;--diagram-primary:#4A90D9;--diagram-secondary:#718096;--diagram-accent:#E53E3E;--diagram-muted:#A0AEC0;--diagram-surface:#EDF2F7;--font-display:"Space Grotesk",system-ui,-apple-system,sans-serif;--font-body:"Inter",system-ui,-apple-system,sans-serif;--duration-appear:400ms;--duration-draw:600ms;--duration-highlight:1000ms;--duration-state:300ms;--easing-default:cubic-bezier(0.4,0,0.2,1)}.brain-prediction-machine{background:var(--background);color:var(--ink);font-family:var(--font-body);min-height:100vh;line-height:1.7}.brain-prediction-machine *{box-sizing:border-box}.essay-header{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background:transparent;transition:background var(--duration-state) var(--easing-default),box-shadow var(--duration-state) var(--easing-default)}.essay-header.scrolled{background:rgba(247,250,252,.95);backdrop-filter:blur(8px);box-shadow:0 1px 3px rgba(0,0,0,.1)}.back-link{display:flex;align-items:center;gap:.5rem;color:var(--ink);text-decoration:none;font-family:var(--font-display);font-size:.875rem;font-weight:500;opacity:.7;transition:opacity var(--duration-state)}.back-link:hover{opacity:1}.header-meta{display:flex;align-items:center;gap:.5rem;font-size:.75rem;color:var(--diagram-muted)}.header-category{text-transform:uppercase;letter-spacing:.05em}.reading-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:101;background:var(--diagram-surface)}.reading-progress-fill{height:100%;background:var(--diagram-primary);transition:width .1s linear}.hero-section{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem;text-align:center;position:relative;overflow:hidden}.hero-background{position:absolute;inset:0;background:radial-gradient(ellipse at 30% 20%,rgba(74,144,217,.08) 0,transparent 50%),radial-gradient(ellipse at 70% 80%,rgba(74,144,217,.05) 0,transparent 40%)}.brain-prediction-machine .hero-content{position:relative;z-index:1;max-width:800px;display:flex;flex-direction:column;align-items:center;text-align:center;grid-template-columns:unset;gap:unset}.brain-prediction-machine .hero-eyebrow{font-family:var(--font-display);font-size:.875rem;text-transform:uppercase;letter-spacing:.15em;color:var(--diagram-primary);margin-bottom:1.5rem;opacity:0;animation:fadeInUp var(--duration-appear) var(--easing-default) forwards}.brain-prediction-machine .hero-title{font-family:var(--font-display);font-size:clamp(2.5rem,6vw,4rem);font-weight:700;line-height:1.1;margin:0 0 1.5rem;color:var(--ink);opacity:0;animation:fadeInUp var(--duration-appear) var(--easing-default) .1s forwards;background:none;-webkit-text-fill-color:currentColor;background-clip:border-box}.brain-prediction-machine .hero-subtitle{font-size:1.25rem;color:var(--diagram-secondary);max-width:600px;margin:0 auto 3rem;opacity:0;animation:fadeInUp var(--duration-appear) var(--easing-default) .2s forwards}.brain-prediction-machine .hero-thesis{background:white;border-left:4px solid var(--diagram-primary);padding:1.5rem 2rem;text-align:left;border-radius:0 8px 8px 0;box-shadow:0 4px 12px rgba(0,0,0,.05);max-width:600px;margin:0 auto;opacity:0;animation:fadeInUp var(--duration-appear) var(--easing-default) .3s forwards}.hero-thesis p{margin:0;font-size:1.125rem;font-weight:500;color:var(--ink)}.scroll-hint{position:absolute;bottom:2rem;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:.5rem;color:var(--diagram-muted);font-size:.75rem;opacity:0;animation:fadeInUp var(--duration-appear) var(--easing-default) .5s forwards,bounce 2s ease-in-out 1s infinite}.essay-section{padding:6rem 2rem;max-width:720px;margin:0 auto;opacity:0;transform:translateY(20px);transition:opacity var(--duration-appear) var(--easing-default),transform var(--duration-appear) var(--easing-default)}.essay-section.visible{opacity:1;transform:translateY(0)}.section-number{font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--diagram-primary);margin-bottom:.5rem}.section-number,.section-title{font-family:var(--font-display)}.section-title{font-size:clamp(1.75rem,4vw,2.25rem);font-weight:600;line-height:1.2;margin:0 0 1.5rem;color:var(--ink)}.section-content p{margin:0 0 1.5rem;font-size:1.125rem}.section-content p:last-child{margin-bottom:0}.key-sentence{font-weight:500;color:var(--ink)}.diagram-container{background:var(--diagram-surface);border-radius:12px;padding:2rem;margin:2.5rem 0;position:relative}.diagram-label{font-family:var(--font-display);font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;color:var(--diagram-muted);margin-bottom:1rem}.diagram-svg{width:100%;height:auto;display:block}.diagram-caption{font-size:.875rem;color:var(--diagram-secondary);text-align:center;margin-top:1rem}.diagram-svg text{font-family:var(--font-display);fill:var(--ink)}.diagram-svg .element-label{font-size:14px;font-weight:500;text-anchor:middle}.diagram-svg .process-rect{fill:white;stroke:var(--ink);stroke-width:2}.diagram-svg .model-rect{fill:var(--diagram-primary);stroke:var(--diagram-primary);stroke-width:2;rx:8;ry:8}.diagram-svg .model-rect text{fill:white}.diagram-svg .input-circle{fill:var(--diagram-secondary)}.diagram-svg .input-circle text{fill:white}.diagram-svg .output-circle{fill:var(--diagram-primary)}.diagram-svg .arrow-line{stroke:var(--ink);stroke-width:2;fill:none}.diagram-svg .arrow-head{fill:var(--ink)}.diagram-svg .arrow-dashed{stroke-dasharray:8,4}.diagram-svg .error-element{fill:var(--diagram-accent);stroke:var(--diagram-accent)}.diagram-svg .error-element text{fill:white;font-weight:600}.diagram-svg .error-pulse{animation:errorPulse var(--duration-highlight) ease-in-out infinite}@keyframes errorPulse{0%,to{opacity:1}50%{opacity:.7}}.scroll-lock-section{position:relative}.scroll-lock-content{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem}.scroll-lock-progress{position:fixed;bottom:2rem;left:50%;transform:translateX(-50%);width:200px;height:4px;background:var(--diagram-surface);border-radius:2px;overflow:hidden}.scroll-lock-progress-fill{height:100%;background:var(--diagram-primary);transition:width .1s linear}.skip-button{position:fixed;bottom:2rem;right:2rem;background:white;border:1px solid var(--diagram-muted);padding:.5rem 1rem;font-family:var(--font-display);font-size:.75rem;color:var(--ink);cursor:pointer;border-radius:4px;transition:all var(--duration-state)}.skip-button:hover{background:var(--diagram-surface);border-color:var(--diagram-primary)}.definition-callout{background:white;border:1px solid var(--diagram-surface);border-radius:8px;padding:1.5rem;margin:2rem 0}.definition-term{font-family:var(--font-display);font-size:1.125rem;font-weight:600;color:var(--diagram-primary);margin:0 0 .5rem}.definition-text{margin:0;color:var(--ink)}.quote-block{border-left:4px solid var(--diagram-primary);padding:1.5rem 2rem;margin:2.5rem 0;background:white;border-radius:0 8px 8px 0}.quote-text{font-size:1.25rem;font-style:italic;margin:0 0 .75rem;color:var(--ink)}.quote-attribution{font-size:.875rem;color:var(--diagram-secondary)}.misconception-block{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin:2rem 0}.misconception-right,.misconception-wrong{padding:1.5rem;border-radius:8px}.misconception-wrong{background:rgba(229,62,62,.05);border:1px solid rgba(229,62,62,.2)}.misconception-right{background:rgba(74,144,217,.05);border:1px solid rgba(74,144,217,.2)}.misconception-label{font-family:var(--font-display);font-size:.75rem;text-transform:uppercase;letter-spacing:.1em;margin-bottom:.5rem}.misconception-wrong .misconception-label{color:var(--diagram-accent)}.misconception-right .misconception-label{color:var(--diagram-primary)}.misconception-text{margin:0;font-weight:500}.final-section{background:linear-gradient(180deg,var(--background) 0,white 100%);padding:8rem 2rem;text-align:center}.final-content{max-width:600px;margin:0 auto}.final-thesis{font-family:var(--font-display);font-size:clamp(1.5rem,4vw,2rem);font-weight:600;line-height:1.4;color:var(--ink);margin:0 0 2rem}.essay-footer{padding:4rem 2rem;text-align:center;border-top:1px solid var(--diagram-surface)}.footer-back{display:inline-flex;align-items:center;gap:.5rem;color:var(--diagram-primary);text-decoration:none;font-family:var(--font-display);font-size:.875rem;margin-bottom:1rem}.footer-note{font-size:.75rem;color:var(--diagram-muted);margin:0}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes bounce{0%,to{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(-10px)}}@keyframes drawLine{0%{stroke-dashoffset:1000}to{stroke-dashoffset:0}}@media (prefers-reduced-motion:reduce){.hero-eyebrow,.hero-subtitle,.hero-thesis,.hero-title,.scroll-hint{animation:none;opacity:1}.essay-section{opacity:1;transform:none;transition:none}.diagram-svg .error-pulse,.scroll-hint{animation:none}}@media (max-width:768px){.essay-header{padding:.75rem 1rem}.hero-section{padding:1.5rem}.hero-thesis{padding:1rem 1.5rem}.essay-section{padding:4rem 1.5rem}.diagram-container{padding:1.5rem;margin:2rem -.5rem;border-radius:8px}.misconception-block{grid-template-columns:1fr}.scroll-lock-progress{width:150px;bottom:1rem}.skip-button{bottom:1rem;right:1rem;padding:.375rem .75rem;font-size:.625rem}}.naive-model-diagram .element{opacity:0;transition:opacity var(--duration-appear) var(--easing-default)}.naive-model-diagram.animated .element{opacity:1}.naive-model-diagram .element:first-child{transition-delay:0s}.naive-model-diagram .element:nth-child(2){transition-delay:.2s}.naive-model-diagram .element:nth-child(3){transition-delay:.4s}.naive-model-diagram .element:nth-child(4){transition-delay:.6s}.prediction-loop-diagram .loop-arrow{stroke-dasharray:300;stroke-dashoffset:300;transition:stroke-dashoffset var(--duration-draw) var(--easing-default)}.prediction-loop-diagram.animated .loop-arrow{stroke-dashoffset:0}.error-comparison-diagram .error-box{transform:scale(.8);opacity:0;transition:all var(--duration-appear) var(--easing-default)}.error-comparison-diagram.animated .error-box{transform:scale(1);opacity:1}.complete-loop-diagram .connection{stroke-dasharray:100;stroke-dashoffset:100}.complete-loop-diagram.animated .connection{animation:drawLine var(--duration-draw) var(--easing-default) forwards}.complete-loop-diagram .connection:first-child{animation-delay:0s}.complete-loop-diagram .connection:nth-child(2){animation-delay:.2s}.complete-loop-diagram .connection:nth-child(3){animation-delay:.4s}.complete-loop-diagram .connection:nth-child(4){animation-delay:.6s}.complete-loop-diagram .connection:nth-child(5){animation-delay:.8s}.sources-section{margin-top:5rem;padding:4rem 0;background:linear-gradient(180deg,var(--background) 0,var(--diagram-surface) 100%);border-top:1px solid rgba(74,144,217,.2)}.sources-header{text-align:center;max-width:640px;margin:0 auto 3rem;padding:0 1.5rem}.sources-title{font-size:2rem;font-weight:700;color:var(--ink);margin:0 0 1rem}.sources-description{font-size:1rem;color:var(--diagram-secondary);line-height:1.6;margin:0}.sources-content{max-width:800px;margin:0 auto;padding:0 1.5rem;display:flex;flex-direction:column;gap:2rem}.sources-block{background:white;border-radius:12px;padding:1.5rem;box-shadow:0 1px 3px rgba(0,0,0,.05);border:1px solid rgba(99,179,237,.1)}.sources-block--secondary{background:rgba(99,179,237,.03);border-style:dashed}.sources-block-title{display:flex;align-items:center;gap:.5rem;font-size:1rem;font-weight:600;color:var(--ink);margin:0 0 1rem;padding-bottom:.75rem;border-bottom:1px solid rgba(99,179,237,.15)}.sources-block-title--small{font-size:.9rem}.sources-icon{font-size:1rem}.sources-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.75rem}.sources-list--compact{gap:.5rem}.source-item{display:flex;flex-wrap:wrap;align-items:baseline;gap:.25rem .5rem;font-size:.875rem;line-height:1.5;padding:.5rem 0;border-bottom:1px solid rgba(0,0,0,.04)}.source-item:last-child{border-bottom:none;padding-bottom:0}.source-item--book{background:rgba(99,179,237,.03);padding:.75rem;border-radius:6px;border-bottom:none}.source-author{font-weight:600;color:var(--ink)}.source-year{color:var(--diagram-muted);font-size:.8125rem}.source-title{font-style:italic;color:var(--diagram-secondary);flex-basis:100%}.source-journal{font-size:.8125rem;color:var(--diagram-muted);flex-basis:100%}.source-publisher{font-size:.8125rem;color:var(--diagram-primary);font-weight:500}.source-note{font-size:.8125rem;color:var(--diagram-muted);flex-basis:100%}.sources-footer{max-width:800px;margin:2.5rem auto 0;padding:1.5rem;text-align:center;background:rgba(99,179,237,.05);border-radius:8px}.sources-verification{display:flex;flex-direction:column;align-items:center;gap:.5rem;margin:0 0 .75rem;font-size:.875rem;color:var(--diagram-secondary)}.sources-badge{display:inline-block;background:var(--diagram-primary);color:white;font-size:.75rem;font-weight:600;padding:.375rem .75rem;border-radius:100px}.sources-note{font-size:.8125rem;color:var(--diagram-muted);margin:0}@media (max-width:640px){.sources-section{margin-top:3rem;padding:3rem 0}.sources-title{font-size:1.5rem}.sources-block{padding:1rem}.source-item{font-size:.8125rem}}