#splitPdfTool{--primary:#0d6efd;--primary-hover:#0b5ed7;--primary-light:#e7f1ff;--bg2:#f8fafc;--text:#0f172a;--muted:#475569;--border:#cbd5e1;--err:#dc2626;--ok:#16a34a;
font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;color:var(--text);max-width:960px;margin:0 auto;padding:16px;line-height:1.6;box-sizing:border-box}
#splitPdfTool *{box-sizing:border-box}
#splitPdfTool .text-muted{color:var(--muted)}
#splitPdfTool h2{margin:0 0 10px;font-weight:700;color:var(--text)}
#splitPdfTool .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;font-size:1rem;font-weight:600;border-radius:8px;border:1px solid transparent;cursor:pointer;transition:.2s;text-decoration:none;line-height:1.4}
#splitPdfTool .btn:disabled{opacity:.55;cursor:not-allowed}
#splitPdfTool .btn-primary{background:var(--primary);color:#fff}
#splitPdfTool .btn-primary:hover:not(:disabled){background:var(--primary-hover)}
#splitPdfTool .btn-outline{background:transparent;border-color:var(--border);color:var(--text)}
#splitPdfTool .btn-outline:hover:not(:disabled){border-color:var(--primary);color:var(--primary);background:var(--primary-light)}
#splitPdfTool .btn-sm{padding:8px 14px;font-size:.88rem}
#splitPdfTool .btn-block{width:100%;font-size:1.1rem;padding:15px}
#splitPdfTool .btn-text{background:none;border:none;padding:4px 8px;color:var(--err);cursor:pointer;font-size:.9rem;font-weight:600}
#splitPdfTool .app-container{background:#fff;border-radius:16px;box-shadow:0 10px 25px -5px rgba(0,0,0,.1);border:1px solid var(--border);overflow:hidden}
#splitPdfTool .app-body{padding:28px}
@media(max-width:640px){#splitPdfTool .app-body{padding:16px}}
#splitPdfTool .notice{padding:14px 18px;border-radius:12px;margin-bottom:20px;background:#fee2e2;color:#991b1b;border:1px solid #fca5a5;font-weight:500}
#splitPdfTool .notice.hidden{display:none!important}
#splitPdfTool .upload-area{border:2px dashed var(--primary);border-radius:12px;padding:50px 20px;background:#fff;cursor:pointer;transition:.25s;position:relative;text-align:center}
#splitPdfTool .upload-area:hover,#splitPdfTool .upload-area.dragover{background:var(--primary-light);border-color:var(--primary-hover)}
#splitPdfTool .upload-area input[type=file]{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer;z-index:5}
#splitPdfTool .upload-icon{width:60px;height:60px;color:var(--primary);margin-bottom:12px;pointer-events:none}
#splitPdfTool .upload-title{font-size:1.3rem;font-weight:700;margin-bottom:6px;pointer-events:none}
#splitPdfTool .upload-area p,#splitPdfTool .upload-area .btn{pointer-events:none}
#splitPdfTool .upload-area p{margin:0 0 16px}
#splitPdfTool .file-info-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--bg2);border:1px solid var(--border);border-radius:8px;padding:12px 16px;margin-bottom:20px}
#splitPdfTool .file-details{overflow:hidden}
#splitPdfTool .file-name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#splitPdfTool .file-meta{font-size:.85rem;color:var(--muted)}
#splitPdfTool .split-modes{display:flex;gap:10px;margin-bottom:22px;background:var(--bg2);padding:6px;border-radius:12px}
#splitPdfTool .mode-tab{flex:1;text-align:center;padding:10px;border-radius:8px;cursor:pointer;font-weight:600;color:var(--muted);border:2px solid transparent}
#splitPdfTool .mode-tab.active{background:#fff;color:var(--primary);border-color:var(--primary)}
#splitPdfTool .range-input-wrapper{margin-bottom:18px}
#splitPdfTool label{display:block;font-weight:600;margin-bottom:8px}
#splitPdfTool .custom-input{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:8px;font-size:.95rem;font-family:inherit;background:#fff;color:var(--text)}
#splitPdfTool .custom-input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(13,110,253,.15)}
#splitPdfTool .view-controls{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--border);flex-wrap:wrap;gap:10px}
#splitPdfTool .selection-stats{font-weight:600}
#splitPdfTool .thumbnail-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:14px;max-height:480px;overflow-y:auto;padding:12px;background:var(--bg2);border-radius:12px;border:1px solid var(--border);margin-bottom:22px}
#splitPdfTool .thumbnail-card{background:#fff;border:2px solid var(--border);border-radius:8px;padding:8px;cursor:pointer;transition:.2s;position:relative;display:flex;flex-direction:column;align-items:center;user-select:none}
#splitPdfTool .thumbnail-card:hover{border-color:#93c5fd}
#splitPdfTool .thumbnail-card.selected{border-color:var(--primary);background:var(--primary-light)}
#splitPdfTool .canvas-wrapper{width:100%;height:150px;display:flex;align-items:center;justify-content:center;margin-bottom:8px;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.08);border-radius:4px;overflow:hidden}
#splitPdfTool .thumbnail-card canvas{max-width:100%;max-height:100%;object-fit:contain}
#splitPdfTool .page-fallback-icon{display:flex;flex-direction:column;align-items:center;color:var(--muted);gap:4px}
#splitPdfTool .page-label{font-size:.85rem;font-weight:600}
#splitPdfTool .check-indicator{position:absolute;top:6px;left:6px;width:22px;height:22px;border-radius:50%;background:#fff;border:2px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:transparent;z-index:2}
#splitPdfTool .thumbnail-card.selected .check-indicator{background:var(--primary);border-color:var(--primary);color:#fff}
#splitPdfTool .output-options{background:var(--bg2);padding:18px;border-radius:12px;margin-bottom:22px;border:1px solid var(--border)}
#splitPdfTool .option-group{margin-bottom:14px}
#splitPdfTool .option-group:last-child{margin-bottom:0}
#splitPdfTool .processing-state,#splitPdfTool .success-state{text-align:center;padding:40px 16px}
#splitPdfTool .progress-wrapper{width:100%;height:10px;background:var(--border);border-radius:5px;margin:20px 0;overflow:hidden}
#splitPdfTool .progress-bar{height:100%;background:var(--primary);width:0;transition:width .3s}
#splitPdfTool .success-icon{color:var(--ok);width:60px;height:60px;margin-bottom:12px}
#splitPdfTool .action-buttons{display:flex;gap:14px;justify-content:center;margin-top:22px;flex-wrap:wrap}