:root{--primary:#007bff;--success:#198754;--bg:#f0f2f5;--panel:#fff;--border:#d9dee5;--text:#212529;--muted:#6c757d}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);margin:0;padding:20px}.container{max-width:1000px;margin:0 auto;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:24px}.tabs{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap}.tab{width:auto;flex:0 0 auto;padding:10px 16px;border:1px solid var(--border);border-radius:8px;background:#fff;cursor:pointer;color:var(--text)}.tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}.panel{display:none}.panel.active{display:block}.desc{color:var(--muted)}input[type=file],select,button{width:100%;box-sizing:border-box;margin:10px 0;padding:10px;border-radius:8px;border:1px solid var(--border);background:var(--panel);color:var(--text)}button{background:var(--primary);color:#fff;border:none;cursor:pointer;font-weight:600}.row{display:grid;grid-template-columns:100px 1fr;gap:12px;align-items:center}.file-list,.preview-grid{display:grid;gap:12px;margin:14px 0}.file-item,.page-card{padding:12px;border:1px solid var(--border);border-radius:8px;background:rgba(0,0,0,0.02)}.page-card canvas{max-width:100%;height:auto;border-radius:6px;display:block}.page-card small{display:block;margin-top:8px;color:var(--muted)}body.dark-mode{--primary:#3d8bfd;--success:#20c997;--bg:#1e2128;--panel:#2a2e37;--border:#4a505f;--text:#e5e7eb;--muted:#9ca3af}.dark-mode .tab{background:#2a2e37}.dark-mode .file-item,.dark-mode .page-card{background:rgba(255,255,255,0.03)}@media(max-width:700px){body{padding:10px}.container{padding:16px}.row{grid-template-columns:1fr}}