*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:#1a1a1a;color:#e0e0e0;padding:2rem;min-height:100vh}.container{max-width:800px;margin:0 auto}h1{margin-bottom:.5rem;color:#fff}.subtitle{color:#888;margin-bottom:2rem}.converter-box{background:#2a2a2a;border-radius:8px;padding:2rem;margin-bottom:1rem}.file-input-area{border:2px dashed #444;border-radius:8px;padding:2rem;text-align:center;margin-bottom:1.5rem;cursor:pointer;transition:border-color .3s}.file-input-area:hover{border-color:#666}.file-input-area.dragover{border-color:#06c;background:#1a2a3a}input[type=file]{display:none}.format-selector{margin-bottom:1.5rem}label{display:block;margin-bottom:.5rem;color:#bbb;font-weight:500}select{width:100%;padding:.75rem;background:#1a1a1a;color:#e0e0e0;border:1px solid #444;border-radius:4px;font-size:1rem}button{background:#06c;color:#fff;border:none;padding:.75rem 2rem;border-radius:4px;font-size:1rem;cursor:pointer;transition:background .3s;width:100%}button:hover:not(:disabled){background:#0052a3}button:disabled{background:#444;cursor:not-allowed}.status{margin-top:1rem;padding:1rem;background:#1a1a1a;border-radius:4px;display:none}.status.show{display:block}.status.error{background:#3a1a1a;color:#ff6b6b}.status.success{background:#1a3a1a;color:#51cf66}.status.info{background:#1a2a3a;color:#4dabf7}.file-info{margin-bottom:1rem;padding:1rem;background:#1a1a1a;border-radius:4px;display:none}.file-info.show{display:block}.progress-bar{width:100%;height:4px;background:#1a1a1a;border-radius:2px;overflow:hidden;margin-top:1rem;display:none}.progress-bar.show{display:block}.progress-fill{height:100%;background:#06c;width:0%;transition:width .3s}