:root{--danger-color:#f44;--warning-color:#fa0;--info-color:#0af;--success-color:#0f8;--purple-color:#a855f7;--light-bg:#fffef9;--light-card:#eef4f0;--light-border:rgba(0,0,0,.08);--light-text:#1f2937;--light-muted:#24323f}.container{max-width:1200px;margin:0 auto;padding:0 20px}.article-container{padding-top:100px;padding-bottom:50px}.hero-section{text-align:center;margin-bottom:50px;position:relative;overflow:hidden}.age-badge-hero{display:inline-block;background:linear-gradient(45deg,var(--purple-color),var(--info-color));color:var(--white);padding:10px 30px;border-radius:30px;font-weight:700;font-size:1.2rem;margin-bottom:20px;animation:pulse-glow 2s ease-in-out infinite}@keyframes pulse-glow{0%,to{box-shadow:0 0 20px rgba(168,85,247,.5)}50%{box-shadow:0 0 40px rgba(168,85,247,.8)}}.main-title{font-size:3rem;color:var(--primary);margin-bottom:20px;text-shadow:0 0 20px rgba(0,255,0,.5);line-height:1.2}.subtitle{font-size:1.5rem;color:var(--text-color);opacity:.9}.brain-development-counter{background:linear-gradient(135deg,rgba(168,85,247,.1),rgba(0,170,255,.1));border:2px solid var(--purple-color);border-radius:20px;padding:30px;margin:40px auto;max-width:600px;text-align:center}.counter-number{font-size:4rem;color:var(--purple-color);font-weight:700;margin:10px 0;text-shadow:0 0 30px rgba(168,85,247,.8)}.counter-text{font-size:1.2rem}.section-card{background:linear-gradient(135deg,rgba(0,255,0,.05),rgba(0,255,0,.02));border:1px solid rgba(0,255,0,.2);border-radius:15px;padding:40px;margin-bottom:40px;position:relative;overflow:hidden}.section-card:before{content:"";position:absolute;top:0;left:0;width:5px;height:100%;background:linear-gradient(to bottom,var(--primary),var(--success-color))}.section-title{font-size:2rem;color:var(--primary);margin-bottom:30px;display:flex;align-items:center;gap:15px}.writing-comparison{display:grid;grid-template-columns:1fr 1fr;grid-gap:40px;gap:40px;margin:40px 0;text-align:center}.writing-box{background:rgba(0,0,0,.5);border-radius:15px;padding:30px;position:relative;transition:transform .3s ease}.writing-box:hover{transform:translateY(-5px)}.writing-manuscript{border:2px solid var(--success-color)}.writing-keyboard{border:2px solid var(--warning-color)}.writing-icon{font-size:5rem;margin-bottom:20px}.writing-manuscript .writing-icon{color:var(--success-color);animation:writing-pulse 2s ease-in-out infinite}@keyframes writing-pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.writing-keyboard .writing-icon{color:var(--warning-color);opacity:.7}.writing-stat{font-size:2rem;font-weight:700;margin:10px 0}.study-highlight{background:rgba(0,170,255,.1);border-left:4px solid var(--info-color);padding:20px;margin:30px 0;border-radius:0 10px 10px 0}.study-source{font-size:.9rem;color:var(--info-color);margin-top:10px;font-style:italic}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));grid-gap:30px;gap:30px;margin:40px 0}.stat-card{background:rgba(0,0,0,.5);border:1px solid rgba(0,255,0,.3);border-radius:15px;padding:30px;text-align:center;transition:all .3s ease;position:relative;overflow:hidden}.stat-card:hover{transform:translateY(-5px);border-color:var(--primary);box-shadow:0 10px 30px rgba(0,255,0,.3)}.stat-number{font-size:3rem;font-weight:700;background:linear-gradient(45deg,var(--primary),var(--success-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:10px}.stat-label{font-size:1.1rem;opacity:.9}.stat-detail{font-size:.9rem;color:var(--info-color);margin-top:10px}.timeline-container{position:relative;padding:60px 0;margin:40px 0}.timeline-line{position:absolute;top:30px;left:10%;right:10%;height:2px;background:linear-gradient(to right,var(--purple-color),var(--info-color));z-index:0}.timeline-items{display:flex;justify-content:space-between;position:relative;z-index:2}.timeline-item{text-align:center;flex:1 1;position:relative}.timeline-dot{width:30px;height:30px;background:var(--black);border:3px solid var(--purple-color);border-radius:50%;margin:0 auto 15px;position:relative;z-index:3;transition:all .3s ease;box-shadow:0 0 10px rgba(168,85,247,.5)}.timeline-item:hover .timeline-dot{background:var(--purple-color);transform:scale(1.3);box-shadow:0 0 20px rgba(168,85,247,.8)}.timeline-age{font-size:1.3rem;font-weight:700;color:var(--purple-color);margin-bottom:5px}.timeline-milestone{font-size:.9rem;opacity:.8;line-height:1.4}.activity-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));grid-gap:30px;gap:30px;margin:40px 0}.activity-card{background:linear-gradient(135deg,rgba(0,255,0,.05),rgba(168,85,247,.05));border:2px solid rgba(168,85,247,.3);border-radius:15px;padding:30px;text-align:center;transition:all .3s ease;cursor:pointer}.activity-card:hover{transform:translateY(-10px);border-color:var(--purple-color);background:linear-gradient(135deg,rgba(0,255,0,.1),rgba(168,85,247,.1));box-shadow:0 15px 40px rgba(168,85,247,.3)}.activity-icon{font-size:4rem;margin-bottom:20px;color:var(--purple-color)}.activity-title{font-size:1.3rem;color:var(--purple-color);margin-bottom:15px;font-weight:700}.checklist{background:rgba(168,85,247,.05);border-radius:15px;padding:30px;margin:40px 0}.checklist-item{display:flex;align-items:center;margin-bottom:20px;cursor:pointer;padding:15px;border-radius:10px;transition:all .3s ease}.checklist-item:hover{background:rgba(168,85,247,.1)}.checkbox{width:30px;height:30px;border:2px solid var(--purple-color);border-radius:5px;margin-right:20px;display:flex;align-items:center;justify-content:center;transition:all .3s ease;flex-shrink:0}.checkbox.checked{background:var(--purple-color);animation:check-pop .3s ease}@keyframes check-pop{0%{transform:scale(1)}50%{transform:scale(1.2)}to{transform:scale(1)}}.checkbox.checked:after{content:"✓";color:var(--white);font-weight:700;font-size:1.2rem}.checklist-text{font-size:1.1rem}.progress-container{margin-top:30px}.progress-bar{width:100%;height:20px;background:hsla(0,0%,100%,.1);border-radius:10px}.progress-bar,.progress-fill{overflow:hidden;position:relative}.progress-fill{height:100%;background:linear-gradient(90deg,var(--danger-color),var(--warning-color),var(--purple-color),var(--success-color));transition:width .5s ease}.progress-fill:after{content:"";position:absolute;top:0;left:0;bottom:0;right:0;background:linear-gradient(90deg,transparent,hsla(0,0%,100%,.3),transparent);animation:shimmer 2s infinite}@keyframes shimmer{0%{transform:translateX(-100%)}to{transform:translateX(100%)}}.progress-text{text-align:center;margin-top:15px;font-size:1.2rem;font-weight:700}.cta-section{background:linear-gradient(135deg,rgba(168,85,247,.1),rgba(0,255,0,.05));border-radius:20px;padding:50px;text-align:center;margin-top:60px;border:2px solid var(--purple-color)}.cta-button{display:inline-block;padding:15px 40px;background:linear-gradient(45deg,var(--purple-color),var(--info-color));color:var(--white);text-decoration:none;border-radius:30px;font-weight:700;font-size:1.2rem;transition:all .3s ease;margin-top:20px;box-shadow:0 5px 20px rgba(168,85,247,.5)}.cta-button:hover{transform:translateY(-3px);box-shadow:0 8px 30px rgba(168,85,247,.7)}.reference-link{color:var(--info-color);text-decoration:none;font-size:.9rem;transition:all .3s ease}.reference-link:hover{color:var(--primary);text-decoration:underline}@keyframes danger-pulse{0%,to{transform:scale(1);filter:brightness(1)}50%{transform:scale(1.05);filter:brightness(1.2)}}.danger-icon{animation:danger-pulse 2s ease-in-out infinite}.comparison-table{background:rgba(0,0,0,.5);border-radius:15px;padding:30px;margin:40px 0;overflow-x:auto}.comparison-table table{width:100%;border-collapse:collapse}.comparison-table th{background:rgba(168,85,247,.2);padding:15px;text-align:left;color:var(--purple-color);font-weight:700;border-bottom:2px solid var(--purple-color)}.comparison-table td{padding:15px;border-bottom:1px solid hsla(0,0%,100%,.1)}.comparison-table tr:hover{background:rgba(168,85,247,.05)}.good{color:var(--success-color)}.bad{color:var(--danger-color)}@media (max-width:767px){.article-container{padding-top:80px}.main-title{font-size:2rem}.writing-comparison{grid-template-columns:1fr}.timeline-container{padding:30px 0}.timeline-items{flex-direction:column;gap:40px}.timeline-line{top:0;bottom:0;left:50%;width:2px;height:auto;transform:translateX(-50%)}.timeline-dot{margin-bottom:10px}.section-card{padding:20px}.section-title{font-size:1.5rem}}[data-theme=light] .subtitle{color:var(--light-muted);opacity:1}[data-theme=light] .brain-development-counter{background:#f8f6ff;border-color:#d6b7ff;color:var(--light-text)}[data-theme=light] .section-card{background:var(--light-bg);border:1px solid var(--light-border);box-shadow:0 10px 24px rgba(0,0,0,.06)}[data-theme=light] .activity-card,[data-theme=light] .checklist,[data-theme=light] .comparison-table,[data-theme=light] .stat-card,[data-theme=light] .writing-box{background:var(--light-card);border:1px solid var(--light-border);box-shadow:0 6px 18px rgba(0,0,0,.05);color:var(--light-text)}[data-theme=light] .comparison-table th{background:#f5ecff;color:#6b21a8;border-bottom:2px solid #a855f7}[data-theme=light] .comparison-table td{border-bottom:1px solid rgba(0,0,0,.06)}[data-theme=light] .timeline-dot{background:#fff;border-color:#a855f7}[data-theme=light] .cta-section{background:#faf8ff;border-color:#d6b7ff}[data-theme=light] .cta-button{box-shadow:0 6px 20px rgba(168,85,247,.3)}[data-theme=light] .reference-link{color:#0ea5e9}[data-theme=light] .reference-link:hover{color:#166534}[data-theme=light] .main-title{color:#4c1d95;text-shadow:none}[data-theme=light] .section-title{color:#0f172a}[data-theme=light] .good{color:#15803d}[data-theme=light] .bad{color:#b91c1c}[data-theme=light] .counter-number{color:#6b21a8;text-shadow:none}[data-theme=light] .activity-icon,[data-theme=light] .activity-title,[data-theme=light] .timeline-age{color:#6b21a8}[data-theme=light] .section-card:before{background:linear-gradient(180deg,#16a34a,#22c55e)}[data-theme=light] .cta-button[style*="var(--info-color)"]{background:#2563eb!important;color:#fff!important}