:root{--brand: #2563eb;--bg: #0b1020;--text: #121212}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:#f7f7fb}.app-shell{display:grid;grid-template-rows:64px 1fr;min-height:100%}.header{display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:#fff;border-bottom:1px solid #e5e7eb}.logo{display:flex;align-items:center;gap:10px;font-weight:700}.nav{display:flex;gap:10px}.nav a{padding:8px 12px;border-radius:8px;text-decoration:none;color:#374151}.nav a.active{background:#eef2ff;color:#1f2937}.container{padding:16px;max-width:1100px;margin:0 auto}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:12px}.card h3{margin:0 0 8px;font-size:16px}.btn{background:var(--brand);color:#fff;border:none;border-radius:10px;padding:10px 14px;cursor:pointer;font-weight:600}.btn.secondary{background:#111827}.btn.ghost{background:transparent;border:1px solid #e5e7eb;color:#1f2937}.btn-row{display:flex;gap:10px;flex-wrap:wrap}.input,.select{width:100%;padding:10px;border:1px solid #e5e7eb;border-radius:10px;background:#fff}.label{font-size:12px;color:#6b7280;margin-bottom:6px}.field{display:grid;gap:6px;margin-bottom:10px}.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}@media (max-width: 800px){.row{grid-template-columns:1fr}}.qr-preview-wrapper{display:grid;grid-template-columns:1fr 300px;gap:16px}@media (max-width: 900px){.qr-preview-wrapper{grid-template-columns:1fr}}.preview-box{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:12px;display:flex;align-items:center;justify-content:center;min-height:280px}.preview-title{font-size:14px;color:#6b7280;margin-bottom:6px}.list{display:grid;gap:10px}.list-item{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:12px;display:grid;grid-template-columns:80px 1fr auto;gap:12px;align-items:center}.list-item h4{margin:0}.muted{color:#6b7280;font-size:12px}