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ease}.upload-button{background:linear-gradient(135deg,#3498db,#2ecc71);color:#fff;border:none;padding:1rem 2rem;border-radius:8px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .3s ease;width:100%}.upload-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #3498db4d}.upload-button:disabled{opacity:.6;cursor:not-allowed}.file-list-container{background:#fff;border-radius:12px;padding:2rem;box-shadow:0 4px 6px #0000001a}.file-list-container h2{margin-bottom:1.5rem;color:#2c3e50;border-bottom:2px solid #e74c3c;padding-bottom:.5rem}.loading{text-align:center;padding:2rem;color:#666;font-size:1.1rem}.no-files{text-align:center;color:#666;font-style:italic;padding:2rem}.file-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}.file-card{border:1px solid #b4ffff;border-radius:12px;padding:1.3rem;background:#fbffff;transition:all .3s cubic-bezier(.25,.8,.25,1);box-shadow:0 2px 4px 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#0000000d}.download-button:after,.delete-button:after{content:"";position:absolute;top:50%;left:50%;width:5px;height:5px;background:#ffffff80;opacity:0;border-radius:100%;transform:scale(1) translate(-50%);transform-origin:50% 50%}.download-button:hover:after,.delete-button:hover:after{animation:ripple .6s ease-out}@keyframes ripple{0%{transform:scale(0);opacity:.5}to{transform:scale(20);opacity:0}}.file-card:before{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:linear-gradient(90deg,#3498db,#2ecc71);opacity:.7;border-radius:12px 12px 0 0;border:1px solid linear-gradient(90deg,#3498db,#2ecc71)}.file-preview2{width:100%;height:160px;margin-bottom:12px;border-radius:8px;overflow:hidden;display:flex;align-items:center;justify-content:center;background-color:#f5f5f5;position:relative}.file-preview2 img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}.file-preview2:hover img{transform:scale(1.02)}.file-preview2-fallback{display:none;width:100%;height:100%;align-items:center;justify-content:center;font-size:48px}.file-icon-container{width:100%;height:80px;display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:48px;background-color:#f5f5f5;border-radius:8px}@media (min-width: 1200px){.file-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}}@media (max-width: 1024px){.file-grid{grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}}@media (max-width: 768px){.app-main{padding:1rem}.upload-container,.file-list-container{padding:1.5rem}.file-grid{grid-template-columns:1fr}.file-actions{flex-direction:column}.app-header h1{font-size:2rem}}