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0;border-radius:8px;margin-bottom:24px;padding:10px 16px;transition:all .3s}.back-btn:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-bg)}.speed-changer{flex-direction:column;gap:24px;max-width:800px;display:flex}.back-button{background:var(--card-bg);border:1px solid var(--border);color:var(--text);border-radius:6px;align-items:center;gap:6px;margin-bottom:12px;padding:8px 14px;font-size:13px;font-weight:600;text-decoration:none;transition:all .3s;display:inline-flex}.back-button:hover{background:var(--accent);color:#fff;border-color:var(--accent);transform:translate(-4px)}.speed-changer .page-header{text-align:center;margin-bottom:24px}.speed-changer .page-header h1{color:var(--text-h);margin:0 0 8px;font-size:32px}.speed-changer .page-header p{color:var(--text);margin:0;font-size:16px}.speed-changer .upload-area{border:2px dashed var(--border);text-align:center;cursor:pointer;background:var(--upload-bg);border-radius:16px;padding:48px 24px;transition:all .3s;position:relative}.speed-changer .upload-area:hover{border-color:var(--accent);background:var(--accent-bg)}.speed-changer .upload-label{cursor:pointer;flex-direction:column;align-items:center;gap:12px;display:flex}.speed-changer .upload-icon{font-size:48px}.speed-changer .upload-text{color:var(--text-h);font-size:18px;font-weight:600}.speed-changer .upload-subtext{color:var(--text);font-size:14px}.speed-changer .upload-input{display:none}.audio-panel{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:20px;padding:24px;display:flex}.player-section{flex-direction:column;gap:12px;display:flex}.player-section h3{color:var(--text-h);margin:0;font-size:16px}.audio-player{border-radius:8px;width:100%}.settings-panel{flex-direction:column;gap:16px;display:flex}.speed-display{background:var(--upload-bg);border-radius:8px;justify-content:space-between;align-items:center;padding:12px;display:flex}.speed-label{color:var(--text-h);font-weight:600}.speed-value{color:var(--accent);font-size:18px;font-weight:700}.range-input{background:var(--border);appearance:none;border-radius:3px;outline:none;width:100%;height:6px}.range-input::-webkit-slider-thumb{appearance:none;background:var(--accent);cursor:pointer;border-radius:50%;width:20px;height:20px;transition:all .2s;box-shadow:0 0 8px #aa3bff4d}.range-input::-webkit-slider-thumb:hover{box-shadow:0 0 12px var(--accent);transform:scale(1.2)}.range-input::-moz-range-thumb{background:var(--accent);cursor:pointer;border:none;border-radius:50%;width:20px;height:20px;transition:all .2s;box-shadow:0 0 8px #aa3bff4d}.range-input::-moz-range-thumb:hover{box-shadow:0 0 12px var(--accent);transform:scale(1.2)}.speed-presets{flex-wrap:wrap;gap:8px;display:flex}.preset-btn{border:2px solid var(--border);background:var(--upload-bg);cursor:pointer;color:var(--text);font-size:13px;font-weight:600;font-family:var(--sans);border-radius:6px;padding:8px 12px;transition:all .2s}.preset-btn:hover{border-color:var(--accent);background:var(--accent-bg)}.preset-btn.active{background:var(--accent);border-color:var(--accent);color:#fff}.btn{cursor:pointer;font-size:16px;font-weight:600;font-family:var(--sans);border:none;border-radius:8px;margin-top:12px;padding:12px 24px;transition:all .3s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 16px #aa3bff4d}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{background:var(--border);color:var(--text)}.btn-secondary:hover{background:var(--accent);color:#fff}.preview-section{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;flex-direction:column;align-items:center;gap:16px;padding:24px;display:flex}.preview-section h3{color:var(--text-h);margin:0;font-size:18px}@media (width<=768px){.speed-changer{gap:16px}.speed-changer .page-header h1{font-size:24px}.speed-changer .upload-area{padding:32px 16px}.speed-changer .upload-icon{font-size:36px}.audio-panel{padding:16px}.speed-presets{gap:6px}.preset-btn{padding:6px 10px;font-size:12px}}@media (width<=475px){.speed-changer .page-header h1{font-size:20px}.speed-changer .upload-text{font-size:16px}.settings-panel{gap:12px}.speed-presets{gap:4px}.preset-btn{padding:6px 8px;font-size:11px}}