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.nav-link-number{color:var(--text-main)}@media(max-width:1024px){.floating-exercise-nav{display:none}}.exercise-section{min-height:auto;display:flex;align-items:flex-start;border-bottom:1px solid var(--accent-line);padding:var(--space-2xl) 0}.bg-light{background-color:#f0ebe6}.exercise-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:var(--space-xl);align-items:flex-start}.exercise-grid.reverse{grid-template-columns:1.2fr 1fr;gap:var(--space-xl)}.exercise-grid.reverse .exercise-content{order:2}.exercise-content{max-width:800px;margin-left:auto;margin-right:auto}.exercise-content .badge{display:block;text-align:center;margin-bottom:var(--space-md)}.exercise-content h2{font-size:var(--text-4xl);margin-bottom:var(--space-md);margin-top:0;line-height:1.2;word-break:normal;-webkit-hyphens:none;hyphens:none;text-align:center}.exercise-content p{font-size:var(--text-base);color:var(--text-muted);line-height:var(--leading-relaxed);margin-bottom:var(--space-md);text-align:center;max-width:100%;margin-left:auto;margin-right:2%}.exercise-content p:last-of-type{margin-bottom:0}.interaction-hint{display:flex;align-items:center;gap:var(--space-sm);margin-top:var(--space-xl);margin-left:auto;margin-right:auto;font-size:var(--text-sm);color:var(--text-main);font-weight:var(--weight-medium);padding:var(--space-sm) var(--space-md);border:1px solid var(--accent-line);border-radius:var(--radius-full);width:fit-content}.demo-container{background:#fff;border-radius:var(--radius-lg);padding:0;box-shadow:0 30px 60px #00000014;border:1px solid var(--accent-line);position:relative;overflow:hidden;width:100%}.controls{padding:var(--space-lg);display:flex;flex-direction:column;align-items:center;gap:var(--space-xs);background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);width:100%;border-top:1px solid var(--accent-line)}input[type=range].slider{-webkit-appearance:none;appearance:none;width:100%;max-width:400px;height:4px;background:var(--accent-line);border-radius:var(--radius-full);outline:none;margin:var(--space-md) 0}input[type=range].slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:24px;height:24px;background:var(--text-main);border:2px solid white;border-radius:50%;cursor:pointer;box-shadow:var(--shadow-md);transition:transform .2s ease}input[type=range].slider::-webkit-slider-thumb:hover{transform:scale(1.1)}.controls label{font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);font-weight:var(--weight-medium)}.relativity-box{width:100%;height:550px;background:#888;display:flex;align-items:center;justify-content:center;transition:background .1s linear;position:relative}.relativity-controls{position:absolute;bottom:var(--space-md);left:50%;transform:translate(-50%);z-index:10;width:80%;max-width:400px;background:#fffc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-full);border:1px solid var(--accent-line);display:flex;flex-direction:column;align-items:center}.relativity-controls .slider{margin:5px 0}.center-square{width:180px;height:180px;background:#888;box-shadow:0 10px 30px #0000001a}#demo-dress{background:#f5f5f5;padding:var(--space-2xl)}.dress-photo-container{position:relative;width:100%;max-width:450px;margin:0 auto}.dress-photo{width:100%;height:auto;display:block;border-radius:var(--radius-md);box-shadow:0 20px 50px #00000026}#demo-albers{max-width:900px;width:100%}.albers-experiment{display:flex;width:100%;height:550px;position:relative;border-radius:var(--radius-md);overflow:hidden}.albers-controls{position:absolute;bottom:var(--space-md);left:50%;transform:translate(-50%);z-index:10;width:80%;max-width:400px;background:#fffc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-full);border:1px solid var(--accent-line);display:flex;flex-direction:column;align-items:center}.albers-controls .slider{margin:5px 0}.albers-panel{flex:1;position:relative;display:flex;align-items:center;justify-content:center}.albers-panel.left{background:#f33}.albers-panel.right{background:#33f}.albers-square{width:180px;height:180px;background:#969;border-radius:var(--radius-sm);transition:transform .1s ease-out;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:0 0 20px #0000001a;z-index:2}#demo-troxler{background:#fff;display:flex;justify-content:center;align-items:center;min-height:550px;max-width:900px;margin:0 auto;position:relative;border:1px solid var(--accent-line);border-radius:var(--radius-lg)}.troxler-circle{position:absolute;top:0;left:0;width:100%;height:100%}.troxler-blur{width:100%;height:100%;background:radial-gradient(circle at 50% 50%,#ff9aa2,#ffb7b2,#ffdac1,#e2f0cb,#b5ead7,#c7ceea 75%,#dec3f0 85%,#fff);filter:blur(70px);opacity:.6}.fixation-cross{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:2.5rem;font-weight:700;color:#000;z-index:2;text-shadow:0 0 2px rgba(255,255,255,.8);line-height:1}#demo-gelb{max-width:900px;width:100%;padding:0;background:#000;border:1px solid var(--accent-line)}.gelb-room{width:100%;height:600px;background:#050505;position:relative;display:flex;align-items:center;justify-content:center;overflow:hidden;transition:background 1.2s cubic-bezier(.4,0,.2,1);box-shadow:inset 0 0 100px #000c}.gelb-object{width:240px;height:240px;background:#444;border-radius:50%;position:relative;z-index:2}.gelb-spotlight{position:absolute;top:0;left:0;width:100%;height:100%;background:radial-gradient(circle at center,rgba(255,255,255,.05) 0%,transparent 70%);opacity:1;transition:opacity 1.2s ease;pointer-events:none}.gelb-room.active{background:#fff}.gelb-room.active .gelb-spotlight{opacity:0}.gelb-controls{position:absolute;bottom:var(--space-lg);left:50%;transform:translate(-50%);z-index:10}#gelb-toggle{margin-top:0;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#fff;padding:var(--space-sm) var(--space-xl);border-radius:var(--radius-full);font-weight:var(--weight-medium);transition:all .3s ease}.gelb-room.active #gelb-toggle{background:#0000000d;border-color:#0000001a;color:#000}#gelb-toggle:hover{background:#fff3;transform:translateY(-2px)}.gelb-room.active #gelb-toggle:hover{background:#0000001a}#gelb-toggle{margin-top:var(--space-lg)}#demo-constancy{max-width:900px;width:100%;padding:0;overflow:hidden;background:#fdfbf7}.scene{position:relative;width:100%;height:500px;display:flex;justify-content:center;align-items:center;gap:var(--space-2xl);background:#e8e2da;transition:background .8s ease;padding:var(--space-xl)}.lighting-overlay{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:5;transition:background .8s ease;mix-blend-mode:multiply}.fruit{width:160px;height:160px;border-radius:50%;position:relative;z-index:2;box-shadow:0 20px 40px #0000001a;background-image:radial-gradient(circle at 30% 30%,rgba(255,255,255,.2) 0%,transparent 60%)}.fruit.red{background-color:#ff3b30}.fruit.green{background-color:#4cd964}.fruit.yellow{background-color:#fc0}.constancy-controls{position:absolute;bottom:var(--space-lg);left:50%;transform:translate(-50%);z-index:10;display:flex;gap:var(--space-sm);background:#fffc;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding:6px;border-radius:var(--radius-full);border:1px solid var(--accent-line)}.filter-btn{padding:var(--space-xs) var(--space-lg);border:none;background:transparent;cursor:pointer;border-radius:var(--radius-full);font-size:var(--text-sm);font-weight:var(--weight-medium);transition:all .3s ease;color:var(--text-muted)}.filter-btn.active{background:var(--text-main);color:#fff;box-shadow:var(--shadow-md)}.scene[data-light=daylight]{background:#e8e2da}.scene[data-light=daylight] .lighting-overlay{background:transparent}.scene[data-light=sunset]{background:#d4a373}.scene[data-light=sunset] .lighting-overlay{background:#ff963266}.scene[data-light=blue]{background:#2c3e50}.scene[data-light=blue] .lighting-overlay{background:#0032c84d}#demo-fading{max-width:900px;width:100%;min-height:520px;position:relative;overflow:hidden;background:#eee;max-height:none}.fading-pattern{width:100%;height:100%;min-height:500px;background-image:radial-gradient(circle,#666 1.5px,transparent 1.5px),radial-gradient(circle,#666 1.5px,transparent 1.5px);background-size:30px 30px;background-position:0 0,15px 15px;opacity:.3;transition:opacity 4s cubic-bezier(.4,0,1,1);position:relative}#demo-fading .caption{position:absolute;bottom:var(--space-md);left:50%;transform:translate(-50%);font-size:var(--text-sm);color:var(--text-muted);text-align:center;z-index:2;background:#ffffffe6;padding:var(--space-xs) var(--space-md);border-radius:var(--radius-full)}.controls{margin-top:var(--space-lg);width:100%;display:flex;flex-direction:column;align-items:center;gap:var(--space-md)}.control-group{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs);width:100%}.control-group label{font-size:var(--text-sm);color:var(--text-muted);margin-bottom:var(--space-xs)}.toggle-btn{min-width:180px}.slider{width:100%;accent-color:var(--text-main)}@media(max-width:1024px){.exercise-grid,.exercise-grid.reverse{grid-template-columns:1fr;gap:var(--space-lg)}.exercise-grid.reverse .exercise-content{order:0}.exercise-section{min-height:auto;padding:var(--space-2xl) 0}.demo-container{min-height:280px}}@media(max-width:768px){.exercise-content h2{font-size:var(--text-3xl)}.relativity-box{width:400px;height:450px}.center-square{width:150px;height:150px}.albers-experiment{height:450px}.albers-square{width:100px;height:100px}.gelb-room{height:400px}.gelb-object{width:160px;height:160px}.scene{padding:var(--space-md);gap:var(--space-md);flex-wrap:wrap;justify-content:center}.fruit{width:120px;height:120px}.dress-photo-container{max-width:450px}.controls{width:90%}.filter-btn{padding:var(--space-xs) var(--space-sm);font-size:var(--text-xs);margin:var(--space-xs)}}@media(max-width:480px){.demo-container{padding:var(--space-md);min-height:240px}.relativity-box{width:300px;height:350px}.center-square{width:110px;height:110px}.albers-experiment{height:350px}.albers-square{width:80px;height:80px}.gelb-room{height:300px}.gelb-object{width:120px;height:120px}.scene{gap:var(--space-sm)}.fruit{width:100px;height:100px}.dress-photo-container{max-width:350px}.interaction-hint{font-size:var(--text-xs);padding:var(--space-xs) var(--space-sm)}}.contrast-stage{position:relative;width:100%;height:500px;display:flex;justify-content:center;align-items:center;overflow:hidden;background-color:#f8fafc}.contrast-bg-noise{position:absolute;inset:0;opacity:.05;pointer-events:none;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");z-index:0}.contrast-artboard{position:relative;width:100%;height:100%;display:flex;align-items:center;justify-content:center}.contrast-side{position:absolute;width:50%;height:100%;display:flex;align-items:center;justify-content:center}.contrast-side.left{left:0;z-index:30}.contrast-side.right{right:0;z-index:10}.contrast-word-wrapper{display:flex;flex-direction:column;align-items:center;transition:transform 1s cubic-bezier(.4,0,.2,1)}.contrast-word{font-family:Amiri,serif;font-size:8rem;line-height:1;color:#f4c430;-webkit-user-select:none;user-select:none;transition:transform .7s ease;text-shadow:0 4px 12px rgba(0,0,0,.1)}@media(min-width:768px){.contrast-word{font-size:10rem}}.contrast-label-group{margin-top:1rem;display:flex;flex-direction:column;align-items:center;opacity:0;transition:opacity .5s ease}.contrast-sub{font-size:.75rem;letter-spacing:.3em;text-transform:uppercase;color:#94a3b8}.contrast-desc{font-size:10px;letter-spacing:.1em;color:#64748b;margin-top:.25rem;text-transform:uppercase}#demo-contrast.pattern-active .contrast-label-group{opacity:1}.contrast-pattern-layer{position:absolute;inset:0;z-index:20;pointer-events:none;opacity:0;transition:opacity 1s ease}.mashrabiya-pattern{width:100%;height:100%;background-color:transparent;background-image:linear-gradient(90deg,transparent 50%,#1e1b4b 50%);background-size:8px 100%;opacity:.9}#demo-contrast.pattern-active .contrast-pattern-layer{opacity:1}#demo-contrast.compare-mode .left-word{transform:translate(25%)}#demo-contrast.compare-mode .right-word{transform:translate(-25%)}@media(max-width:768px){.contrast-stage{height:350px}.contrast-word{font-size:5rem}#demo-contrast.compare-mode .left-word{transform:translateY(20%)}#demo-contrast.compare-mode .right-word{transform:translateY(-20%)}}.contrast-overlay-controls{position:absolute;bottom:2rem;left:50%;transform:translate(-50%);z-index:50;width:auto;display:flex;flex-direction:column;align-items:center;gap:.5rem}.feature-list{list-style:none;padding:0;margin:var(--space-lg) 0}.feature-list li{margin-bottom:var(--space-sm);padding-left:var(--space-lg);position:relative;color:var(--text-muted)}.feature-list li:before{content:"•";position:absolute;left:0;color:var(--text-main);font-weight:700}.book-spread{display:flex;background:#fff;box-shadow:var(--shadow-xl);border-radius:var(--radius-sm);overflow:hidden;aspect-ratio:3/2;transform:perspective(1000px) rotateY(-5deg);transition:transform var(--transition-smooth)}.book-spread:hover{transform:perspective(1000px) rotateY(0) scale(1.02)}.page{flex:1;padding:var(--space-lg);border:1px solid #eee;background:#fff;position:relative}.left-page{border-right:1px solid #ddd;background:linear-gradient(to right,#fff 95%,#eee)}.right-page{border-left:none;background:linear-gradient(to left,#fff 95%,#eee)}.page-content{height:100%;display:flex;flex-direction:column;gap:var(--space-md)}.preview-text h2{font-size:var(--text-5xl);margin-bottom:var(--space-lg);line-height:1.1}.preview-text p{font-size:var(--text-base);color:var(--text-muted);line-height:var(--leading-relaxed);margin-bottom:var(--space-md)}.content-breakdown h2{font-size:var(--text-5xl);margin-bottom:var(--space-2xl);line-height:1.1}.content-breakdown .card h4{font-size:var(--text-2xl);margin-bottom:var(--space-md);line-height:1.2}.content-breakdown .card p{font-size:var(--text-base);color:var(--text-muted);line-height:var(--leading-relaxed)}.page-content h3{font-size:var(--text-lg);margin-bottom:var(--space-sm)}.page-image{width:100%;height:120px;background:#f5f5f5;border-radius:var(--radius-sm)}.page-text{width:100%;height:10px;background:#f5f5f5;margin-bottom:5px}.page-text:last-child{width:80%}@media(max-width:1024px){.preview-section .grid-2{grid-template-columns:1fr;gap:var(--space-2xl)}.preview-gallery{order:1}.preview-text{order:2}}@media(max-width:768px){.preview-text h2,.content-breakdown h2{font-size:var(--text-3xl)}.preview-section .grid-2{gap:var(--space-xl)}.book-spread{flex-direction:column;aspect-ratio:auto;transform:perspective(1000px) rotateY(0)}.book-spread:hover{transform:perspective(1000px) rotateY(0) scale(1.01)}.page{padding:var(--space-md)}.left-page{border-right:none;border-bottom:1px solid #ddd;background:linear-gradient(to bottom,#fff 95%,#eee)}.right-page{background:linear-gradient(to top,#fff 95%,#eee)}.page-image{height:100px}.content-breakdown .card h4{font-size:var(--text-xl)}.preview-text .btn{width:100%}}@media(max-width:480px){.page{padding:var(--space-sm)}.page-content h3{font-size:var(--text-base)}.page-image{height:80px}.feature-list li{font-size:var(--text-sm)}}