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70%);content:"";height:200%;position:absolute;right:-50%;top:-50%;width:200%}.formulae-intro .cta-title{font-size:2.2rem;font-weight:700;margin-bottom:20px;position:relative;z-index:1}.formulae-intro .cta-text{font-size:1.1rem;margin:0 auto 30px;max-width:600px;opacity:.9;position:relative;z-index:1}.formulae-intro .bookmark-btn{background:hsla(0,0%,100%,.15);border:2px solid hsla(0,0%,100%,.3);border-radius:50px;color:#fff;cursor:pointer;display:inline-block;font-size:1.1rem;font-weight:600;overflow:hidden;padding:18px 35px;position:relative;text-decoration:none;transition:all .4s ease;z-index:1}.formulae-intro .bookmark-btn:before{background:hsla(0,0%,100%,.1);content:"";height:100%;left:-100%;position:absolute;top:0;transition:left .4s ease;width:100%}.formulae-intro .bookmark-btn:hover:before{left:100%}.formulae-intro .bookmark-btn:hover{background:hsla(0,0%,100%,.25);box-shadow:0 12px 30px rgba(0,0,0,.2);transform:translateY(-3px)}.applications-section,.formulae-intro .concepts-section{margin:60px 0}.applications-grid,.formulae-intro .concepts-grid{display:grid;gap:25px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));margin-top:30px}.application-card,.formulae-intro .concept-card{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:linear-gradient(145deg,hsla(0,0%,100%,.95),rgba(248,250,255,.9));border-left:5px solid #29b95f;border-radius:16px;box-shadow:0 4px 15px rgba(30,60,114,.08);cursor:pointer;padding:25px;transition:all .4s ease}.application-card:hover,.formulae-intro .concept-card:hover{border-left-color:#309255;box-shadow:0 12px 30px rgba(30,60,114,.15);transform:translateY(-5px)}.application-card h4,.formulae-intro .concept-card h4{color:#1e3c72;font-size:1.1rem;margin-bottom:10px}.application-card p,.formulae-intro .concept-card p{color:#6c757d;line-height:1.5}.formulae-intro .app-icon{font-size:2rem;margin-bottom:15px}.formulae-intro .tips-section{background:linear-gradient(145deg,rgba(248,250,255,.6),rgba(240,245,255,.4));border-radius:20px;margin:60px 0;padding:40px}.formulae-intro .tips-container{display:grid;gap:25px;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));margin-top:30px}.formulae-intro .tip-card{align-items:flex-start;background:#fff;border-radius:15px;box-shadow:0 4px 15px rgba(30,60,114,.08);display:flex;gap:20px;padding:25px;transition:all .3s ease}.formulae-intro .tip-card:hover{box-shadow:0 8px 25px rgba(30,60,114,.12);transform:translateY(-3px)}.formulae-intro .tip-number{align-items:center;background:linear-gradient(135deg,#29b95f,#309255);border-radius:50%;color:#fff;display:flex;flex-shrink:0;font-weight:700;height:40px;justify-content:center;width:40px}.formulae-intro .tip-content h4{color:#1e3c72;font-size:1.1rem;margin-bottom:8px}.formulae-intro .tip-content p{color:#6c757d;line-height:1.5}.formulae-intro .quick-reference{margin:60px 0;text-align:center}.formulae-intro .reference-intro{color:#5a6c7d;font-size:1.1rem;line-height:1.6;margin:0 auto 30px;max-width:800px}.formulae-intro .reference-highlights{display:flex;flex-wrap:wrap;gap:30px;justify-content:center;margin-top:30px}.formulae-intro .highlight-item{background:linear-gradient(135deg,#29b95f,#309255);border-radius:50px;box-shadow:0 4px 15px rgba(30,60,114,.2);color:#fff;font-size:.95rem;padding:15px 25px}@media (max-width:768px){.formulae-intro h1{font-size:2.5rem}.formulae-intro .hero,.formulae-intro .main-content{padding:40px 20px}.formulae-intro .categories-grid{grid-template-columns:1fr}.formulae-intro .categories-grid.masonry-js{-moz-columns:1;column-count:1}.formulae-intro .stats-grid{grid-template-columns:repeat(2,1fr)}.formulae-intro .category-card{padding:25px}.formulae-intro .category-icon{font-size:1.5rem;height:60px;width:60px}.applications-grid,.formulae-intro .concepts-grid,.formulae-intro .tips-container{grid-template-columns:1fr}.formulae-intro .reference-highlights{align-items:center;flex-direction:column}}@media (max-width:480px){.formulae-intro h1{font-size:2rem}.formulae-intro .stats-grid{grid-template-columns:1fr}}.formulae-body-nosplit{display:flex;justify-content:space-around;position:relative}.formulae-body-nosplit .formulae-wrapper{padding:20px}.formulae-footer{min-height:30px}