#pdf-merger-app{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;max-width:960px;margin:2rem auto;background:#fff;border-radius:12px;box-shadow:0 8px 25px rgb(0 0 0 / .08);padding:2rem}.upload-area{border:2px dashed #ccc;border-radius:12px;padding:3rem;text-align:center;transition:border-color 0.3s}.upload-area.dragover{border-color:#2563eb;background:#f0f7ff}.upload-icon{font-size:3rem}.btn{padding:.6rem 1.5rem;border:none;border-radius:8px;cursor:pointer;font-size:1rem;transition:background 0.2s}.btn-select{background:#2563eb;color:#fff}.btn-select:hover{background:#1d4ed8}.btn-add{background:#10b981;color:#fff;margin-left:auto}.btn-add:hover{background:#059669}.btn-merge{background:#f59e0b;color:#fff}.btn-merge:hover{background:#d97706}.btn-clear{background:#ef4444;color:#fff}.btn-download{background:#6366f1;color:#fff;text-decoration:none;display:inline-block}.btn-new{background:#8b5cf6;color:#fff}.hidden{display:none!important}.progress-container{margin-top:1.5rem;text-align:center}.progress-bar{width:100%;height:8px;background:#e5e7eb;border-radius:10px;overflow:hidden;margin:.5rem 0}.progress-fill{height:100%;width:0%;background:#2563eb;transition:width 0.2s}.progress-fill.indeterminate{width:100%;background:repeating-linear-gradient(90deg,#2563eb 0,#2563eb 12px,transparent 12px,transparent 24px);animation:progress-move 0.8s linear infinite}@keyframes progress-move{0%{background-position:0 0}100%{background-position:24px 0}}.file-list{margin-top:2rem}.list-header{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-bottom:1.5rem}.file-items{display:flex;flex-wrap:wrap;gap:1.5rem}.file-card{border:1px solid #e5e7eb;border-radius:12px;background:#fff;width:calc(25% - 1.125rem);min-width:180px;box-shadow:0 1px 3px rgb(0 0 0 / .05);transition:box-shadow 0.2s;display:flex;flex-direction:column;overflow:hidden}.file-card:hover{box-shadow:0 4px 12px rgb(0 0 0 / .1)}.file-preview-wrap{position:relative;width:100%;height:150px;background:#f9fafb;border-bottom:1px solid #e5e7eb}.file-preview-wrap iframe{width:100%;height:100%;border:0}.file-size-badge{position:absolute;bottom:6px;right:6px;background:rgb(0 0 0 / .65);color:#fff;font-size:.7rem;padding:2px 6px;border-radius:4px;opacity:0;transform:translateY(4px);transition:opacity 0.2s,transform 0.2s;pointer-events:none}.file-card:hover .file-size-badge{opacity:1;transform:translateY(0)}.file-info{padding:.8rem;flex:1}.file-name{font-size:.85rem;font-weight:500;word-break:break-word;margin-bottom:.4rem}.file-meta{font-size:.75rem;color:#6b7280;display:flex;align-items:center;gap:8px;margin-bottom:.6rem}.file-actions{display:flex;gap:.5rem;padding:.5rem .8rem .8rem;justify-content:flex-end}.btn-remove-text{padding:.4rem .8rem;font-size:.8rem;border:1px solid #d1d5db;background:#fff;border-radius:6px;cursor:pointer;color:#4b5563;transition:background 0.2s,border-color 0.2s,color 0.2s}.btn-remove-text:hover{background:#fee2e2;border-color:#fca5a5;color:#ef4444}.remove-btn:hover{background:#fee2e2;border-color:#fca5a5}.remove-btn:hover svg{stroke:#ef4444}#merge-actions{margin-top:1.5rem;display:flex;align-items:center;gap:1rem;flex-wrap:wrap}#result-area{margin-top:2rem}.result-actions{margin-top:1rem;display:flex;gap:1rem;flex-wrap:wrap}