:root{--primary-color:#000;--bg-color:#fafafa;--border-color:#e5e5e5;--text-color:#333}body{background-color:var(--bg-color);color:var(--text-color);margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.container{max-width:900px;margin:0 auto;padding:40px 20px}header{text-align:center;margin-bottom:40px}h1{margin-bottom:10px;font-size:2.5rem}.subtitle{color:#666;font-size:1.1rem}.tabs{border-bottom:1px solid #0000;justify-content:center;gap:30px;margin-bottom:40px;display:flex}.tabs button{cursor:pointer;color:#666;background:0 0;border:none;padding:10px 0;font-size:1rem;font-weight:500;transition:all .2s;position:relative}.tabs button.active{color:#000;font-weight:600}.tabs button.active:after{content:"";background-color:#000;width:100%;height:2px;position:absolute;bottom:-5px;left:0}.tabs button:hover{color:#000}.upload-area{border:2px dashed var(--border-color);text-align:center;cursor:pointer;background:#fff;border-radius:12px;padding:60px;transition:all .2s}.upload-area:hover{background:#fdfdfd;border-color:#999}.upload-content svg{color:#999;margin-bottom:16px}.support-text{color:#999;margin-top:8px;font-size:.9rem;display:block}.pdf-workspace{background:#fff;border-radius:12px;flex-direction:column;align-items:center;padding:30px;display:flex;box-shadow:0 2px 10px #0000000d}.pdf-actions{flex-wrap:wrap;justify-content:center;gap:15px;margin-bottom:20px;display:flex}.btn-pill{cursor:pointer;border:none;border-radius:20px;padding:8px 20px;font-size:.9rem;font-weight:500;transition:all .2s}.btn-pill:disabled{opacity:.5;cursor:not-allowed}.btn-black{color:#fff;background:#000}.btn-black:hover{background:#333}.btn-white{color:#333;background:#fff;border:1px solid #ddd}.btn-white:hover{background:#f5f5f5}.btn-red{color:#fff;background:#ff4d4f}.btn-red:hover{background:#ff7875}.pdf-pagination{align-items:center;gap:15px;margin-bottom:20px;display:flex}.btn-icon{color:#666;cursor:pointer;background:#f0f0f0;border:none;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:1rem;transition:all .2s;display:flex}.btn-icon:hover:not(:disabled){background:#e0e0e0}.btn-icon:disabled{opacity:.5;cursor:not-allowed}.page-indicator{color:#333;font-size:1rem;font-weight:500}.pdf-preview-container{background:#f5f5f5;border-radius:8px;justify-content:center;width:100%;min-height:500px;padding:20px;display:flex;position:relative}.canvas-wrapper{position:relative;box-shadow:0 4px 12px #0000001a}canvas{max-width:100%;height:auto;display:block}.loading-overlay{color:#333;background:#fffc;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;display:flex;position:absolute;top:0;left:0}.spinner{border:3px solid #f3f3f3;border-top-color:#000;border-radius:50%;width:30px;height:30px;margin-bottom:10px;animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.download-section{margin-top:20px}.file-list{background:#fff;border-radius:12px;padding:20px;box-shadow:0 2px 8px #0000000d}.actions{border-bottom:1px solid var(--border-color);justify-content:flex-end;gap:12px;margin-bottom:20px;padding-bottom:20px;display:flex}.btn{cursor:pointer;border:none;border-radius:6px;padding:10px 20px;font-size:1rem;font-weight:500;transition:all .2s}.btn-primary{background:var(--primary-color);color:#fff;text-decoration:none}.btn-primary:hover{opacity:.9}.btn-secondary{color:#333;background:#f0f0f0}.file-item{border-bottom:1px solid #f0f0f0;padding:20px 0}.file-info{justify-content:space-between;margin-bottom:16px;display:flex}.preview-area{gap:20px;margin-top:10px;display:flex}.preview-box{text-align:center;background:#f9f9f9;border-radius:8px;flex:1;padding:10px}.preview-box img,.preview-box video{border-radius:4px;max-width:100%;max-height:300px}.btn-download{color:#fff;background:#333;border-radius:4px;margin-top:10px;padding:6px 16px;font-size:.9rem;text-decoration:none;display:inline-block}