.merge-root{max-width:980px;margin:20px auto;padding:16px}.tool-title{font-size:22px;margin-bottom:2px}.upload-zone{padding:20px}.upload-icon{font-size:36px}.subtext{font-size:13px;color:#6b7280;margin-top:6px}.pdf-list{margin-top:12px;display:flex;flex-direction:column;gap:10px}.pdf-card{gap:12px;align-items:center;padding:10px;border-radius:10px;border:1px solid #eee}.pdf-left{width:140px;display:flex;gap:8px;align-items:center}.drag-handle{cursor:grab;padding:6px}.thumb-wrapper{width:98px;height:70px;overflow:hidden;border-radius:6px;border:1px solid #f0f0f0;display:flex;align-items:center;justify-content:center;background:#fafafa}.thumb-embed{width:100%;height:100%;object-fit:cover}.thumb{font-weight:600;color:#555}.pdf-mid{flex:1;min-width:0}.pdf-name{font-weight:600}.icon-btn{background:transparent;border:none;font-size:16px}.progress-modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.36);z-index:999}.progress-card{background:#fff;padding:18px;border-radius:8px;width:min(480px,95%);text-align:center}.progress-bar{height:10px;background:#eef2ff;border-radius:999px;margin:10px 0;overflow:hidden}.progress-inner{height:100%;width:0;background:#2563eb;transition:width .2s linear}.result-card{padding:12px;border-radius:8px;border:1px solid #eee;display:flex;justify-content:space-between;align-items:center;margin-top:12px}.result-title{font-weight:700}.result-meta{color:#6b7280;margin-top:6px}.result-actions{display:flex;gap:8px}.merge-hero{margin-bottom:50px}.tool-title{font-size:44px;letter-spacing:-.6px}.pdf-card,.pdf-card-horiz{position:relative}.merge-root{max-width:1200px;margin:0 auto;padding:30px 20px 100px;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial}.merge-hero{text-align:center;margin-bottom:40px}.tool-title{font-size:32px;font-weight:700;color:#0f172a;margin-bottom:4px}.tool-sub{color:#6b7280;margin-bottom:14px}.upload-zone{border:2px dashed #e5e7eb;padding:18px;border-radius:10px;display:flex;justify-content:center;align-items:center;gap:12px;background:#fff}.upload-zone.drag-over{border-color:#2563eb;background:rgba(37,99,235,.03)}.upload-inner{display:flex;gap:12px;align-items:center}.cta-btn{background:#2563eb;color:#fff;border:none;padding:10px 16px}.cta-btn,.small-btn{border-radius:8px;cursor:pointer}.small-btn{padding:8px 10px;border:1px solid #e5e7eb;background:#fff}.pdf-list{margin-top:16px;display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));align-items:start}@media (min-width:1600px){.pdf-list{grid-template-columns:repeat(5,1fr)}}@media (min-width:1200px) and (max-width:1599px){.pdf-list{grid-template-columns:repeat(4,1fr)}}@media (min-width:900px) and (max-width:1199px){.pdf-list{grid-template-columns:repeat(3,1fr)}}@media (max-width:899px){.pdf-list{grid-template-columns:repeat(2,1fr)}}@media (max-width:480px){.pdf-list{grid-template-columns:1fr}}.pdf-card{position:relative;display:flex;flex-direction:column;gap:10px;padding:12px;border-radius:12px;background:#fff;border:1px solid #eef2f7;box-shadow:0 6px 18px rgba(28,35,50,.04);min-height:220px;overflow:visible}.pdf-card.is-dragging{opacity:.6;transform:translateY(-4px) scale(.995);box-shadow:0 14px 30px rgba(0,0,0,.1);cursor:grabbing}.card-actions{position:absolute;right:8px;top:8px;display:flex;gap:6px;z-index:5}.icon-btn{width:32px;height:32px;border-radius:50%;border:1px solid #e6eef6;background:#fff;font-size:14px;box-shadow:0 2px 6px rgba(0,0,0,.04)}.icon-btn:hover,.thumb-area{background:#f8fafc}.thumb-area{height:160px;display:flex;align-items:center;justify-content:center;border-radius:8px;overflow:visible;padding:6px}.thumb-area img{max-width:100%;max-height:100%;object-fit:contain;transform-origin:center center;display:block}.thumb-placeholder{width:220px;height:140px;display:flex;align-items:center;justify-content:center;border-radius:8px;background:#fff;color:#64748b;font-weight:600;padding:8px;text-align:center}.pdf-info{padding:0 2px;min-width:0}.pdf-name{font-weight:700;font-size:14px;color:#0f172a;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pdf-meta{font-size:13px;color:#6b7280;margin-top:6px}.action-bar{position:sticky;bottom:12px;margin-top:16px;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px;border-radius:10px;border:1px solid #eee;background:#fff}.primary{background:#2563eb;color:#fff;padding:8px 12px;border-radius:8px;text-decoration:none}.muted{background:transparent;border:1px solid #e5e7eb;padding:8px 10px;border-radius:8px;cursor:pointer}.empty{padding:18px;color:#94a3b8;text-align:center;border:1px dashed #e6eef6;border-radius:8px}@media (max-width:768px){.mobile-merge-bar{position:fixed;bottom:0;left:0;right:0;z-index:50;padding:12px;background:#ffffff;box-shadow:0 -8px 24px rgba(0,0,0,.08)}.mobile-merge-btn{width:100%;padding:16px;font-size:17px;font-weight:700;border-radius:14px;border:none;background:#79ffc3;color:#ffffff}.mobile-merge-btn:disabled{opacity:.6}}@media (min-width:769px){.mobile-merge-bar{display:none}}.desktop-organize-header{position:-webkit-sticky;position:sticky;top:0;z-index:1100;display:flex;align-items:center;justify-content:space-between;padding:10px 16px;margin:6px 0 12px;background:#ffffff;border-radius:12px;border:1px solid #e5e7eb;box-shadow:0 6px 18px rgba(2,6,23,.03);transition:box-shadow .16s ease,transform .12s ease;backdrop-filter:blur(2px)}@media (min-width:1600px){.desktop-organize-header{box-shadow:0 10px 30px rgba(2,6,23,.05)}}.left-tools{display:flex;gap:10px}.icon-btn{height:40px;width:40px;border-radius:10px;border:1px solid #e5e7eb;background:#f9fafb;cursor:pointer;font-size:18px;display:inline-flex;align-items:center;justify-content:center;padding:0}.icon-btn svg{display:block}.icon-btn:hover{background:#f1f5f9}.merge-btn{padding:10px 18px;border-radius:10px;border:none;background:#46E5BD;color:#ffffff;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;box-shadow:0 8px 22px rgba(15,118,110,.08);transition:transform .12s ease,box-shadow .12s ease,opacity .12s ease}.merge-btn:active{transform:translateY(1px)}.merge-btn[disabled]{opacity:.5;cursor:not-allowed;pointer-events:none;box-shadow:none}@media (max-width:1023px){.desktop-organize-header{display:none!important}}