.ai-black-friday{min-height:100vh;background:linear-gradient(180deg,#f9fafb,#ffffff)}.scroll-progress-bar{position:fixed;top:0;left:0;right:0;height:4px;background:rgba(0,0,0,.1);z-index:1000}.scroll-progress-fill{height:100%;background:linear-gradient(90deg,#10b981,#3b82f6);transition:width .1s ease}.animated-hero{position:relative;background:linear-gradient(135deg,#667eea,#764ba2);padding:80px 20px 100px;overflow:hidden;margin-bottom:60px}.hero-background{position:absolute;top:0;left:0;right:0;bottom:0;overflow:hidden}.particle{position:absolute;width:4px;height:4px;background:rgba(255,255,255,.5);border-radius:50%;animation:float 10s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0) translateX(0);opacity:0}50%{opacity:1}to{transform:translateY(-100vh) translateX(20px)}}.hero-content{position:relative;z-index:1;max-width:1200px;margin:0 auto;color:white;text-align:center}.hero-nav{margin-bottom:40px;display:flex;justify-content:flex-start;padding:0 1rem}.back-link{display:inline-flex;align-items:center;gap:8px;color:rgba(255,255,255,.9);text-decoration:none;font-size:14px;font-weight:500;padding:8px 16px;border-radius:8px;background:rgba(255,255,255,.1);backdrop-filter:blur(10px);transition:all .3s ease}.back-link:hover{background:rgba(255,255,255,.2);transform:translateX(-4px)}.back-arrow{width:16px;height:16px}.hero-main-title{font-size:clamp(32px,5vw,56px);font-weight:800;line-height:1.2;margin-bottom:32px;display:flex;flex-direction:column;gap:8px;animation:fadeInUp .8s ease .2s forwards;opacity:0}.title-line{display:block}.title-highlight{display:block;background:linear-gradient(90deg,#fff,#e0e7ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-catchy-stat{margin:24px auto 32px;padding:20px 40px;background:rgba(255,255,255,.95);border-radius:16px;box-shadow:0 4px 20px rgba(0,0,0,.1);max-width:900px;animation:fadeInUp .8s ease .3s forwards;opacity:0;border:2px solid rgba(102,126,234,.2)}.catchy-stat-text{font-size:1.125rem;font-weight:500;color:#374151;text-align:center;display:block;line-height:1.6;letter-spacing:.01em}@keyframes fadeInUp{to{opacity:1;transform:translateY(0)}0%{opacity:0;transform:translateY(20px)}}.hero-stats{display:flex;flex-wrap:wrap;gap:32px;align-items:center;justify-content:center;animation:fadeInUp .8s ease .4s forwards;opacity:0}.stat-item{text-align:center}.stat-value{font-size:clamp(32px,4vw,48px);font-weight:800;line-height:1;margin-bottom:8px}.stat-label{font-size:.75rem;opacity:.8;font-weight:500;text-transform:uppercase;letter-spacing:.05em}.stat-divider{font-size:32px;opacity:.5;font-weight:300}.toc-wrapper{padding:2.5rem 2rem;background:#f9fafb;position:relative;z-index:2;margin-top:-1rem;margin-bottom:-1.5rem;border-radius:20px 20px 0 0}.table-of-contents{max-width:1200px;margin:0 auto;background:white;border-radius:12px;border:1px solid #e5e7eb;box-shadow:0 4px 16px rgba(0,0,0,.08);overflow:hidden}.toc-toggle-button{width:100%;background:#f9fafb;padding:1.25rem 1.5rem;border:none;border-bottom:1px solid #e5e7eb;cursor:pointer;transition:all .2s}.toc-toggle-button:hover{background:#f3f4f6}.toc-toggle-content{display:flex;justify-content:space-between;align-items:center}.toc-header-title{font-size:1.5rem;font-weight:700;color:#111827}.toc-toggle-indicator{display:flex;align-items:center;gap:.5rem}.toc-toggle-text{font-size:.8125rem;color:#6b7280}.toc-chevron{width:1.125rem;height:1.125rem;color:#6b7280}.toc-content{padding:1.5rem;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.toc-nav-grid{gap:1.5rem}.toc-category,.toc-nav-grid{display:flex;flex-direction:column}.toc-category{gap:.75rem}.toc-links-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:.75rem}.toc-nav-item{display:flex;align-items:flex-start;gap:.875rem;padding:.875rem 1rem;border-radius:10px;border:1px solid #e5e7eb;text-decoration:none;transition:all .2s;background:white}.toc-nav-item:hover{border-color:#667eea;background:rgba(102,126,234,.05);transform:translateX(4px)}.toc-item-number{width:1.75rem;height:1.75rem;background:linear-gradient(90deg,#667eea,#764ba2);border-radius:6px;display:flex;align-items:center;justify-content:center;color:white;font-weight:700;font-size:.8125rem;flex-shrink:0;transition:transform .2s}.toc-nav-item:hover .toc-item-number{transform:scale(1.05)}.toc-item-content{flex:1;min-width:0}.toc-item-title{font-size:.9375rem;font-weight:600;color:#111827;transition:color .2s}.toc-nav-item:hover .toc-item-title{color:#667eea}.chart-section-wrapper{padding:60px 20px}.chart-section{max-width:1200px;margin:0 auto}.chart-container{background:white;border-radius:16px;padding:40px;box-shadow:0 1px 3px rgba(0,0,0,.1)}.chart-header{margin-bottom:40px;text-align:center}.chart-title{font-size:clamp(24px,3vw,32px);font-weight:700;color:#111827;margin-bottom:16px;line-height:1.3}.chart-subtitle{font-size:15px;color:#6b7280;line-height:1.6}.study-info-section{margin-top:40px;padding:40px;background:#ecfdf5;border-radius:12px;border:1px solid #a7f3d0}.study-info-title{font-size:1.25rem;font-weight:700;color:#111827;margin-bottom:16px;display:flex;align-items:center;gap:10px}.study-info-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px}.study-info-item{display:flex;align-items:flex-start;gap:14px;padding:14px 18px;background:white;border-radius:10px;border:1px solid #a7f3d0;transition:all .3s ease}.study-info-item:hover{background:#d1fae5;border-color:#10b981;transform:translateX(4px);box-shadow:0 4px 12px rgba(16,185,129,.1)}.info-bullet{width:8px;height:8px;background:#10b981;border-radius:50%;flex-shrink:0;margin-top:8px;box-shadow:0 0 0 3px rgba(16,185,129,.2)}.study-info-item:hover .info-bullet{background:#059669;box-shadow:0 0 0 4px rgba(16,185,129,.3)}.info-text{font-size:1rem;line-height:1.6;color:#374151;flex:1}.info-text strong{color:#047857;font-weight:600}.chart-actions-wrapper{margin-top:32px;padding-top:32px;border-top:1px solid #e5e7eb}.chart-actions-wrapper [data-chart-actions]{justify-content:center}.legend-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}@media (max-width:768px){.animated-hero{padding:60px 20px 80px}.hero-catchy-stat{margin:20px auto 28px;padding:16px 24px}.catchy-stat-text{font-size:1rem}.hero-stats{gap:20px}.stat-divider{display:none}.legend-grid{grid-template-columns:1fr;gap:12px}.toc-wrapper{padding:1.5rem 1rem}.toc-toggle-button{padding:1rem 1.25rem}.toc-header-title{font-size:1.25rem}.toc-toggle-text{display:none}.toc-content{padding:1rem}.toc-links-grid{grid-template-columns:1fr}.toc-nav-item{padding:.75rem .875rem}.toc-item-title{font-size:.875rem}.chart-container,.study-info-section{padding:24px}}