*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background:linear-gradient(135deg,#1a1a2e,#16213e);min-height:100vh;color:#fff;padding:20px}.container{max-width:500px;margin:0 auto}h1{text-align:center;font-size:1.8rem;margin-bottom:10px;background:linear-gradient(90deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{text-align:center;color:#888;margin-bottom:30px;font-size:.9rem}.upload-area{border:2px dashed #667eea;border-radius:16px;padding:40px 20px;text-align:center;cursor:pointer;transition:all .3s ease;background:rgba(102,126,234,.1)}.upload-area.dragover,.upload-area:hover{border-color:#764ba2;background:rgba(118,75,162,.2)}.upload-icon{font-size:3rem;margin-bottom:15px}.upload-text{font-size:1.1rem;margin-bottom:8px}.upload-hint{color:#888;font-size:.85rem}.file-info{display:none;background:hsla(0,0%,100%,.1);border-radius:12px;padding:15px;margin-top:20px}.file-info.visible{display:block}.file-name{font-weight:600;word-break:break-all;margin-bottom:5px}.file-size{color:#888;font-size:.85rem}.progress-container{display:none;margin-top:20px}.progress-container.visible{display:block}.progress-bar{height:8px;background:hsla(0,0%,100%,.1);border-radius:4px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#667eea,#764ba2);width:0;transition:width .3s ease}.progress-text{text-align:center;margin-top:10px;color:#888;font-size:.9rem}.convert-btn{width:100%;padding:16px;border:none;border-radius:12px;background:linear-gradient(90deg,#667eea,#764ba2);color:#fff;font-size:1.1rem;font-weight:600;cursor:pointer;margin-top:20px;transition:transform .2s ease,opacity .2s ease}.convert-btn:hover{transform:translateY(-2px)}.convert-btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.download-section{display:none;margin-top:25px}.download-section.visible{display:block}.download-title{font-size:1.1rem;margin-bottom:15px;text-align:center}.download-buttons{display:flex;gap:12px}.download-btn{flex:1 1;padding:14px;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:transform .2s ease;text-decoration:none;text-align:center;display:block}.download-btn:hover{transform:translateY(-2px)}.download-btn.mp3{background:#1db954;color:#fff}.download-btn.wav{background:#ff6b35;color:#fff}.error-message{display:none;background:rgba(255,82,82,.2);border:1px solid #ff5252;border-radius:12px;padding:15px;margin-top:20px;color:#ff5252;text-align:center}.error-message.visible{display:block}.reset-btn{width:100%;padding:12px;border:2px solid hsla(0,0%,100%,.3);border-radius:12px;background:transparent;color:#fff;font-size:.95rem;cursor:pointer;margin-top:15px;transition:border-color .2s ease}.reset-btn:hover{border-color:hsla(0,0%,100%,.6)}.loading-spinner{display:inline-block;width:20px;height:20px;border-radius:50%;border:2px solid hsla(0,0%,100%,.3);border-top-color:#fff;animation:spin 1s linear infinite;margin-right:8px;vertical-align:middle}@keyframes spin{to{transform:rotate(1turn)}}@media (max-width:380px){h1{font-size:1.5rem}.download-buttons{flex-direction:column}}