:root{--text:#4b5563;--text-h:#111827;--bg:#f9fafb;--card-bg:#fff;--border:#e5e7eb;--code-bg:#f3f4f6;--accent:#6366f1;--accent-hover:#4f46e5;--accent-bg:#6366f114;--accent-border:#6366f14d;--shadow:0 4px 6px -1px #0000000d, 0 2px 4px -1px #00000008;--shadow-lg:0 10px 15px -3px #00000014, 0 4px 6px -2px #0000000a;--sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--heading:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;--mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--success:#10b981;--success-bg:#10b9811a;--danger:#ef4444;--danger-bg:#ef44441a;--warning:#f59e0b;--warning-bg:#f59e0b1a;font-family:var(--sans);letter-spacing:-.01em;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--text:#9ca3af;--text-h:#f3f4f6;--bg:#0b0f19;--card-bg:#111827;--border:#1f2937;--code-bg:#1f2937;--accent:#818cf8;--accent-hover:#6366f1;--accent-bg:#818cf81a;--accent-border:#818cf866;--shadow:0 4px 6px -1px #0000004d, 0 2px 4px -1px #0003;--shadow-lg:0 10px 15px -3px #0006, 0 4px 6px -2px #0003}}body{background-color:var(--bg);margin:0;padding:0}#root{flex-direction:column;min-height:100vh;display:flex}.container{box-sizing:border-box;width:100%;max-width:1200px;margin:0 auto;padding:24px}.header{text-align:center;margin-bottom:32px;padding-top:24px}.header h1{color:var(--text-h);letter-spacing:-.025em;background:linear-gradient(135deg, var(--accent) 0%, #ec4899 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin:0 0 12px;font-size:2.5rem;font-weight:800}.header p{color:var(--text);max-width:600px;margin:0 auto;font-size:1.1rem}.tabs-container{justify-content:center;margin-bottom:32px;display:flex}.tabs{background-color:var(--card-bg);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:12px;padding:6px;display:inline-flex}.tab-btn{color:var(--text);cursor:pointer;background:0 0;border:none;border-radius:8px;align-items:center;gap:8px;padding:10px 24px;font-size:1rem;font-weight:600;transition:all .2s;display:flex}.tab-btn:hover{color:var(--text-h)}.tab-btn.active{background-color:var(--accent);color:#fff;box-shadow:0 4px 12px #6366f140}.dropzone{border:2px dashed var(--border);background-color:var(--card-bg);text-align:center;cursor:pointer;box-shadow:var(--shadow);border-radius:16px;flex-direction:column;justify-content:center;align-items:center;padding:48px 24px;transition:all .2s;display:flex}.dropzone:hover{border-color:var(--accent);background-color:var(--accent-bg)}.dropzone-active{border-color:var(--accent);background-color:var(--accent-bg);transform:scale(1.01)}.dropzone-icon{color:var(--accent);margin-bottom:16px;transition:transform .2s}.dropzone:hover .dropzone-icon{transform:translateY(-4px)}.dropzone h3{color:var(--text-h);margin:0 0 8px;font-size:1.25rem;font-weight:600}.dropzone p{color:var(--text);margin:0;font-size:.9rem}.file-input{display:none}.card{background-color:var(--card-bg);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:16px;margin-bottom:24px;padding:24px}.card-title{color:var(--text-h);justify-content:space-between;align-items:center;margin:0 0 16px;font-size:1.25rem;font-weight:600;display:flex}.btn{cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:.95rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--accent-hover);box-shadow:0 4px 12px #6366f133}.btn-secondary{background-color:var(--code-bg);color:var(--text-h);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background-color:var(--border)}.btn-danger{background-color:var(--danger-bg);color:var(--danger);border:1px solid #ef444433}.btn-danger:hover:not(:disabled){background-color:var(--danger);color:#fff}.btn:disabled{opacity:.5;cursor:not-allowed}.file-list{flex-direction:column;gap:12px;margin-bottom:24px;display:flex}.file-item{background-color:var(--card-bg);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:12px;justify-content:space-between;align-items:center;padding:12px 16px;transition:all .2s;display:flex}.file-item:hover{border-color:var(--accent-border)}.file-info{align-items:center;gap:12px;min-width:0;display:flex}.file-name{color:var(--text-h);white-space:nowrap;text-overflow:ellipsis;max-width:300px;font-weight:500;overflow:hidden}.file-meta{color:var(--text);font-size:.8rem}.file-actions{align-items:center;gap:8px;display:flex}.action-icon-btn{color:var(--text);cursor:pointer;background:0 0;border:none;border-radius:6px;justify-content:center;align-items:center;padding:6px;transition:all .2s;display:flex}.action-icon-btn:hover{background-color:var(--code-bg);color:var(--text-h)}.action-icon-btn.delete:hover{background-color:var(--danger-bg);color:var(--danger)}.thumbnail-canvas-container{border:1px solid var(--border);aspect-ratio:1/1.414;box-shadow:var(--shadow);background-color:#f3f4f6;border-radius:8px;justify-content:center;align-items:center;display:flex;position:relative;overflow:hidden}.thumbnail-canvas-container canvas{object-fit:contain;width:100%;height:100%}.page-grid{border:1px solid var(--border);background-color:var(--bg);border-radius:12px;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:16px;max-height:500px;margin-top:16px;padding:8px;display:grid;overflow-y:auto}.page-card{cursor:pointer;background-color:var(--card-bg);border:2px solid #0000;border-radius:10px;transition:all .2s;position:relative;overflow:hidden}.page-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.page-card.selected{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-border)}.page-badge{color:#fff;z-index:10;background-color:#111827d9;border-radius:20px;padding:2px 8px;font-size:.75rem;font-weight:600;position:absolute;top:8px;left:8px}.page-checkbox{z-index:10;width:18px;height:18px;accent-color:var(--accent);border-radius:4px;position:absolute;top:8px;right:8px}.alert{border-radius:8px;align-items:center;gap:12px;margin-bottom:20px;padding:12px 16px;font-size:.9rem;display:flex}.alert-danger{background-color:var(--danger-bg);color:var(--danger);border:1px solid #ef444433}.alert-success{background-color:var(--success-bg);color:var(--success);border:1px solid #10b98133}.alert-info{background-color:var(--accent-bg);border:1px solid var(--accent-border);color:var(--accent)}.split-controls{flex-direction:column;gap:16px;display:flex}.control-group{flex-direction:column;gap:8px;display:flex}.control-label{color:var(--text-h);font-size:.95rem;font-weight:600}.input-text{border:1px solid var(--border);background-color:var(--card-bg);color:var(--text-h);box-sizing:border-box;border-radius:8px;width:100%;padding:10px 12px;font-size:.95rem;transition:all .2s}.input-text:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-border);outline:none}.split-options{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-bottom:16px;display:grid}.split-option-card{border:1px solid var(--border);cursor:pointer;background-color:var(--card-bg);box-shadow:var(--shadow);border-radius:12px;flex-direction:column;gap:8px;padding:16px;transition:all .2s;display:flex}.split-option-card:hover{border-color:var(--accent-border)}.split-option-card.active{border-color:var(--accent);background-color:var(--accent-bg)}.split-option-title{color:var(--text-h);font-size:1rem;font-weight:600}.split-option-desc{color:var(--text);font-size:.8rem}.spinner{border:3px solid #ffffff4d;border-top:3px solid var(--accent);border-radius:50%;width:24px;height:24px;animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.progress-container{background-color:var(--code-bg);border-radius:8px;width:100%;height:8px;margin-top:16px;overflow:hidden}.progress-bar{background-color:var(--accent);height:100%;transition:width .3s}.footer{text-align:center;border-top:1px solid var(--border);color:var(--text);margin-top:auto;padding:24px;font-size:.85rem}.page-previews-row{gap:8px;margin-top:8px;padding:8px 0;display:flex;overflow-x:auto}.preview-thumbnail-container{border:1px solid var(--border);width:60px;height:85px;box-shadow:var(--shadow);border-radius:4px;flex-shrink:0;position:relative;overflow:hidden}.preview-badge{color:#fff;z-index:1;background-color:#0009;border-radius:3px;padding:0 4px;font-size:.6rem;position:absolute;bottom:2px;right:2px}.file-item-drag{opacity:.7;border:2px dashed var(--accent)}.topbar{background-color:var(--card-bg);border-bottom:1px solid var(--border);z-index:100;justify-content:space-between;align-items:center;padding:14px 24px;display:flex;position:sticky;top:0;box-shadow:0 1px 3px #0000000d}.brand{color:var(--text-h);background:linear-gradient(135deg, var(--accent) 0%, #ec4899 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;align-items:center;gap:8px;font-size:1.25rem;font-weight:850;text-decoration:none;display:flex}.nav-links{align-items:center;gap:6px;display:flex}.nav-btn{color:var(--text);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:6px;align-items:center;gap:6px;padding:8px 14px;font-size:.88rem;font-weight:600;transition:all .2s;display:flex}.nav-btn:hover{color:var(--text-h);background-color:var(--code-bg)}.nav-btn.active{background-color:var(--accent-bg);color:var(--accent);border-color:var(--accent-border)}@media (width<=768px){.topbar{flex-direction:column;gap:12px;padding:12px}.nav-links{flex-wrap:wrap;justify-content:center;width:100%}.nav-btn{padding:6px 10px;font-size:.8rem}}