/* CSS - Optimized with critical CSS first */
.image-converter{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;max-width:100%;width:100%;padding:15px;box-sizing:border-box;display:flex;flex-direction:column;gap:15px}.header-actions{display:flex;justify-content:flex-end;margin-bottom:10px}.clear-btn{background:#ff6b6b;color:#fff;border:none;padding:8px 16px;border-radius:6px;font-size:14px;cursor:pointer;transition:background .2s}.clear-btn:hover{background:#ff5252}.clear-btn:disabled{background:#ccc;cursor:not-allowed}.upload-area{width:100%;border:2px dashed #ccc;border-radius:10px;padding:25px 15px;text-align:center;transition:all .3s ease;background-color:#f9f9f9}.upload-area:hover,.upload-area.dragover{border-color:#4a89dc;background-color:#f0f7ff}.upload-label{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;cursor:pointer}.upload-icon{width:40px;height:40px;fill:#4a89dc}.file-info{color:#666;font-size:13px;margin-top:6px}.controls{display:flex;flex-direction:column;gap:12px;background:#fff;padding:15px;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,.05)}.control-group{display:flex;flex-direction:column;gap:4px}label{font-weight:500;color:#333;font-size:13px}.format-select,.dimension-input{padding:8px 10px;border:1px solid #ddd;border-radius:6px;font-size:14px;background:#fff}.quality-slider{width:100%;height:6px;-webkit-appearance:none;background:#ddd;border-radius:3px;outline:none;margin:8px 0}.quality-slider::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;background:#4a89dc;border-radius:50%;cursor:pointer}.preview-area{display:flex;flex-direction:column;gap:12px}.preview-area.hidden{display:none}.preview-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}.preview-header h3{margin:0;font-size:16px;color:#333}.preview-container{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:10px}.preview-item{position:relative;border-radius:6px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.1);aspect-ratio:1/1;background:#f5f5f5}.preview-image{width:100%;height:100%;object-fit:contain;display:block}.preview-info{position:absolute;bottom:0;left:0;right:0;background:rgba(0,0,0,.7);color:#fff;padding:5px;font-size:10px;display:flex;justify-content:space-between}.preview-actions{position:absolute;top:0;right:0;display:flex;gap:5px;padding:5px}.preview-btn{width:24px;height:24px;background:rgba(0,0,0,.6);color:#fff;border:none;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:12px}.download-btn{background:#4a89dc;color:#fff;border:none;padding:8px 12px;border-radius:6px;font-size:13px;font-weight:500;cursor:pointer;transition:background .2s}.download-btn:hover{background:#3a70c2}.action-buttons{display:flex;gap:8px;flex-wrap:wrap}.total-stats{display:flex;justify-content:space-between;background:#f5f5f5;padding:10px;border-radius:6px;font-size:13px;flex-wrap:wrap;gap:8px}.total-stats p{margin:0;color:#555}.hidden{display:none!important}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media (max-width:768px){.action-buttons{flex-direction:column;width:100%}.download-btn{width:100%;margin-bottom:8px}.preview-header{flex-direction:column;align-items:flex-start}.preview-header h3{margin-bottom:10px}}