.pdf-gallery{padding:20px 0}.pdf-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:30px;margin-top:30px}.pdf-item{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.08);transition:all .3s cubic-bezier(.4,0,.2,1);border:1px solid #f0f0f0}.pdf-item:hover{transform:translateY(-8px);box-shadow:0 12px 40px rgba(0,0,0,.15)}.pdf-thumbnail{position:relative;overflow:hidden;aspect-ratio:4/3;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%)}.pdf-thumbnail img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}.pdf-item:hover .pdf-thumbnail img{transform:scale(1.1)}.pdf-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.4);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s ease}.pdf-item:hover .pdf-overlay{opacity:1}.pdf-play-icon{width:60px;height:60px;background:rgba(255,255,255,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#333;transform:scale(.8);transition:transform .3s ease}.pdf-item:hover .pdf-play-icon{transform:scale(1)}.pdf-play-icon svg{width:24px;height:24px}.pdf-info{padding:20px}.pdf-title{margin:0 0 8px;font-size:18px;font-weight:600;line-height:1.4}.pdf-title a{color:#333;text-decoration:none;transition:color .3s ease}.pdf-title a:hover{color:#667eea}.pdf-description{margin:0;color:#666;font-size:14px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.message.info.empty{text-align:center;padding:60px 20px;background:#f8f9fa;border-radius:8px;margin-top:30px}.message.info.empty span{font-size:18px;color:#666}@media (max-width:768px){.pdf-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}.pdf-info{padding:15px}.pdf-title{font-size:16px}}