.pdf-merge{background:var(--background);color:var(--foreground);font-family:var(--font-sans);padding:40px 0}.container{flex-direction:column;gap:16px;max-width:1200px;margin:0 auto;padding:0 20px;display:flex}.top-row{grid-template-columns:1fr 280px;gap:16px;display:grid}.upload-area{border:2px dashed var(--border);cursor:pointer;background:var(--light);border-radius:12px;flex-direction:column;gap:12px;min-height:240px;padding:16px;transition:background-color .3s,border-color .3s;display:flex}.upload-area:hover{background:var(--border)}.upload-hint{color:var(--secondary);align-items:center;gap:8px;margin-bottom:12px;display:inline-flex}.empty-state{text-align:center;justify-content:center;align-items:center;display:flex}.hidden-input{display:none}.file-list .list-header{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}.file-list .list-header .actions{align-items:center;gap:8px;display:inline-flex}.file-list .empty{color:var(--secondary);padding:12px}.file-list ul{flex-direction:column;gap:8px;max-height:260px;margin:0;padding:0;list-style:none;display:flex;overflow:auto}.file-item{background:var(--background);border:1px solid var(--border);border-radius:8px;justify-content:space-between;align-items:center;padding:10px 12px;display:flex}.file-item .meta .name{font-weight:600}.file-item .meta .info{color:var(--secondary);font-size:12px}.item-actions{gap:8px;display:flex}.list-summary{color:var(--secondary);margin-top:8px;font-size:12px}.actions-area{flex-direction:column;gap:12px;display:flex}.btn{border:1px solid var(--primary);color:#fff;background:var(--primary);cursor:pointer;border-radius:6px;padding:8px 12px;transition:background-color .3s,color .3s,border-color .3s}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{border-color:var(--border);color:var(--foreground);background:var(--light)}.btn-danger{border-color:var(--danger);color:#fff;background:var(--danger)}.btn-large{padding:12px 16px}.btn-small{padding:4px 8px;font-size:12px}.bottom.preview-area{background:var(--background);border:1px solid var(--border);border-radius:12px;min-height:360px;max-height:70vh;padding:12px;overflow:hidden}.preview-header{margin-bottom:8px;font-weight:600}.preview-empty{color:var(--secondary);padding:12px}.pdf-preview{flex-direction:column;gap:12px;max-height:70vh;display:flex;overflow:auto}.preview-pages{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px;display:grid}.preview-page{background:var(--background);border:1px solid var(--border);border-radius:8px;margin:0;padding:12px;box-shadow:0 1px 3px #00000014}.preview-page .page-header{color:var(--secondary);margin-bottom:8px;font-size:12px}.preview-page img{width:100%;height:auto}.processing-overlay{z-index:1000;background:#00000059;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.processing-content{background:var(--background);border:1px solid var(--border);border-radius:12px;width:360px;padding:16px;box-shadow:0 12px 32px #0003}.processing-text{color:var(--foreground);margin-bottom:12px}.progress-bar-container{background:var(--border);border-radius:100px;width:100%;height:8px;overflow:hidden}.progress-bar{background:var(--primary);width:0%;height:100%}.progress-percentage{color:var(--secondary);text-align:right;margin-top:8px;font-size:12px}@media (max-width:960px){.top-row{grid-template-columns:1fr}}.dark .upload-area{background:var(--background)}.dark .btn-secondary{background:var(--border);color:var(--foreground)}