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.page-wrapper{padding-bottom:5rem}.content-card{padding:20px;border-radius:12px}h1{font-size:2.25rem}h2{font-size:1.75rem;margin-top:30px}h3{font-size:1.4rem;margin-top:25px}h4{font-size:1.15rem}table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;font-size:.9rem}th,td{padding:.75rem}.fun-facts,.did-you-know,.fact-card,.experiment-box{padding:15px 20px;margin:20px 0}.quiz-box{padding:20px}.quiz-option{padding:12px}}@media (max-width: 480px){.page-wrapper{padding:0}.promo-hidden .page-wrapper{padding-bottom:4rem}.container{max-width:100%}.content-card{padding:15px;border-radius:8px}h1{font-size:1.75rem}h2{font-size:1.4rem;margin-top:25px}h3{font-size:1.2rem;margin-top:20px}h4{font-size:1.05rem}p{font-size:.95rem}table{font-size:.85rem}th,td{padding:.5rem}.fun-facts,.did-you-know,.fact-card,.experiment-box{padding:12px 15px;margin:15px 0}.fun-facts h3:before,.did-you-know h3:before{font-size:1.2rem;margin-right:10px}.quiz-box{padding:15px}.quiz-option{padding:10px;font-size:.9rem}}.preview-toolbar{position:fixed;top:0;left:0;right:0;z-index:9999;background:linear-gradient(135deg,#1e293b,#0f172a);box-shadow:0 4px 20px #00000026}.preview-toolbar__inner{max-width:100%;margin:0 auto;padding:12px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}.preview-toolbar__left{display:flex;align-items:center;gap:12px}.preview-toolbar__badge{background:#fbbf24;color:#1e293b;font-size:11px;font-weight:700;padding:4px 10px;border-radius:100px;text-transform:uppercase;letter-spacing:.5px}.preview-toolbar__title{color:#f1f5f9;font-size:14px;font-weight:500}.preview-toolbar__actions{display:flex;gap:10px;align-items:center}.preview-btn{border:none;border-radius:8px;padding:10px 20px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s 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