.split-container{max-width:800px;margin:30px auto;padding:10px;font-family:Segoe UI,sans-serif;color:#333}.split-alert{max-width:800px;margin:20px auto 0}.pdf-upload-box{border:2px dashed #1890ff;border-radius:12px;padding:40px 20px;text-align:center;background-color:#f0f8ff;transition:background-color .3s,border-color .3s;cursor:pointer}.pdf-upload-box:hover{background-color:#e6f7ff;border-color:#40a9ff}.upload-label{display:flex;flex-direction:column;align-items:center;cursor:pointer}.upload-icon{font-size:48px;margin-bottom:16px;color:#1890ff}.upload-text strong{display:block;font-size:18px;margin-bottom:6px;color:#0c2e8a}.upload-text span{font-size:14px;color:#555}.file-table-container{overflow-x:auto;margin:24px 0;border-radius:12px;box-shadow:0 6px 18px rgba(0,0,0,.08);background:#fff}.file-table{width:100%;border-collapse:separate;border-spacing:0}.file-table thead tr{background:#e6f7ff}.file-table td,.file-table th{padding:14px 18px;text-align:center;font-size:.95rem}.file-table td.file-name{text-align:left;display:flex;align-items:center;gap:10px}.pdf-icon{font-size:1.3rem;color:#e03e2d}.actions{gap:10px}.action-btn,.actions{display:flex;justify-content:center}.action-btn{border:none;padding:8px 12px;border-radius:8px;cursor:pointer;font-size:1rem;transition:all .2s;align-items:center}.action-btn.remove{background-color:#fff1f0;color:#f5222d}.action-btn:hover{transform:translateY(-2px);box-shadow:0 4px 10px rgba(0,0,0,.12)}.desktop-view{display:block}.mobile-view{display:none}.output-name-container,.range-input-wrap,.split-options{width:100%;margin-left:auto;margin-right:auto}.split-options{max-width:680px}.output-name-container,.range-input-wrap{max-width:500px}.preview-toggle-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}.preview-toggle-btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:10px 16px;border:1px solid #1890ff;border-radius:8px;background:#f0f8ff;color:#0c2e8a;font-weight:600;cursor:pointer;transition:background-color .2s,box-shadow .2s}.preview-toggle-btn:hover{background:#e6f7ff;box-shadow:0 4px 10px rgba(24,144,255,.14)}.preview-open-link{color:#1890ff;font-weight:600;text-decoration:none;white-space:nowrap}.preview-open-link:hover{color:#0c2e8a;text-decoration:underline}.pdf-preview-panel{width:100%;height:520px;margin:0 auto 22px;border:1px solid #d9ecff;border-radius:8px;overflow:hidden;background:#f7fbff;box-shadow:0 6px 18px rgba(0,0,0,.08)}.pdf-preview-frame{width:100%;height:100%;border:0;display:block}.split-mode-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:12px;gap:12px}.split-mode-card{display:flex;align-items:center;gap:10px;min-height:52px;padding:12px 14px;border:1px solid #d9ecff;border-radius:8px;background:#fff;color:#253858;cursor:pointer;transition:border-color .2s,box-shadow .2s,background-color .2s}.split-mode-card.active{border-color:#1890ff;background:#f0f8ff;box-shadow:0 4px 12px rgba(24,144,255,.14)}.split-mode-card input{flex:0 0 auto}.split-mode-card span{font-weight:600;line-height:1.25}.output-name-input{border-radius:8px;padding:10px 12px;font-size:1rem;width:100%;box-sizing:border-box;transition:all .2s}.output-name-input:focus{border-color:#52c41a;box-shadow:0 0 5px rgba(82,196,26,.5)}.merge-btn{background:#ff7b29;color:#fff;font-weight:600;font-size:1rem;padding:10px 20px;border-radius:8px;min-width:180px;border:none;cursor:pointer;transition:all .2s}.merge-btn:hover:not(:disabled){background-color:#45a049;box-shadow:0 4px 8px rgba(0,0,0,.2)}.merge-btn:disabled{opacity:.6;cursor:not-allowed}.merge-btn-container{width:100%;display:flex;justify-content:center}.pdf-split.seo-content{max-width:900px;margin:50px auto;padding:24px;background:#fff;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,.08);line-height:1.7;font-size:1rem}.pdf-split.seo-content h2{font-size:1.8rem;margin-bottom:16px;color:#222}.pdf-split.seo-content h3{font-size:1.4rem;margin:24px 0 12px;color:#333}.pdf-split.seo-content p{margin-bottom:16px;color:#555}.pdf-split.seo-content ol{padding-left:20px;margin-bottom:16px}.pdf-split.seo-content li{margin-bottom:8px}.pdf-split.seo-content .features-list{list-style:none;padding:0;margin:0 0 16px}.pdf-split.seo-content .features-list li{margin-bottom:8px;font-weight:500;color:#333}.alert-box{background-color:#fff4f4;color:#c00;border:1px solid #f5c2c2;padding:12px 16px;border-radius:8px;margin-bottom:16px;display:flex;justify-content:space-between;align-items:center;font-weight:500}.alert-box .close-btn{background:transparent;border:none;font-size:18px;cursor:pointer;color:#c00}@media (max-width:768px){.split-container{margin:20px auto;padding:10px 14px}.split-container h2{font-size:1.45rem;line-height:1.3}.pdf-upload-box{padding:30px 15px}.upload-icon{font-size:40px}.upload-text strong{font-size:16px}.upload-text span{font-size:13px}.desktop-view{display:none}.mobile-view{display:block}.file-card{border:1px solid #f0f0f0;border-radius:12px;padding:12px 16px;margin-bottom:16px;background:#fff;box-shadow:0 2px 6px rgba(0,0,0,.05)}.file-top-row{justify-content:space-between}.file-name,.file-top-row{display:flex;align-items:center;gap:10px}.file-name{font-weight:500;overflow:hidden;flex:1 1}.file-name span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.actions{flex-shrink:0;gap:6px}.file-details{display:flex;gap:16px;font-size:.85rem;color:#555;margin-top:4px}.pdf-split.seo-content{padding:18px;font-size:.95rem}.pdf-split.seo-content h2{font-size:1.5rem}.pdf-split.seo-content h3{font-size:1.2rem}.pdf-preview-panel{height:460px}}@media (max-width:576px){.preview-toggle-row{align-items:stretch;flex-direction:column}.preview-open-link,.preview-toggle-btn{width:100%;text-align:center}.preview-open-link{padding:8px 0}.pdf-preview-panel{height:380px}.split-mode-grid{grid-template-columns:1fr}.output-name-input{font-size:.95rem;padding:8px 10px}.merge-btn{font-size:.95rem;padding:8px 15px;min-width:150px}}@media (max-width:480px){.pdf-upload-box{padding:25px 10px}.upload-icon{font-size:36px}.upload-text strong{font-size:15px}.upload-text span{font-size:12px}.pdf-split.seo-content{padding:14px;font-size:.9rem}.pdf-split.seo-content h2{font-size:1.3rem}}