*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#f3f5f8;color:#1f2937}
.app{max-width:1250px;margin:0 auto;padding:24px}
header{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}
h1{margin:0;font-size:28px}
p{margin:6px 0 0;color:#6b7280}
.panel{background:#fff;border-radius:16px;padding:18px;margin-bottom:16px;box-shadow:0 8px 24px rgba(0,0,0,.06)}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
label{display:block;font-weight:700;margin-bottom:6px}
input{width:100%;padding:10px;border:1px solid #d1d5db;border-radius:10px;font-size:14px}
button{border:0;background:#e5e7eb;padding:10px 14px;border-radius:10px;cursor:pointer;font-weight:700}
button:hover{filter:brightness(.96)}
.primary{background:#2563eb;color:white}
.section-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.section-title h2{margin:0}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse}
th,td{padding:8px;border-bottom:1px solid #e5e7eb;text-align:left}
th{font-size:13px;color:#4b5563}
td:nth-child(5),th:nth-child(5){text-align:center}
td:nth-child(5) input{width:auto}
.actions{display:flex;gap:10px;margin-top:14px}
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-bottom:16px}
.stat{background:#fff;padding:14px;border-radius:14px;box-shadow:0 6px 18px rgba(0,0,0,.05)}
.stat b{display:block;font-size:20px;margin-top:5px}
.sheet-card{background:#fff;border-radius:16px;padding:18px;margin-bottom:20px;box-shadow:0 8px 24px rgba(0,0,0,.06)}
.sheet-head{display:flex;justify-content:space-between;gap:10px;margin-bottom:12px}
.sheet-title{font-size:18px;font-weight:800}
.canvas-wrap{overflow:auto;border:1px solid #d1d5db;border-radius:12px;background:#fafafa;padding:10px}
svg{display:block;background:white}
.piece text{font-size:12px;fill:#111827;pointer-events:none}
.unplaced{background:#fff3f3;border:1px solid #fecaca;color:#991b1b;border-radius:12px;padding:12px;margin-bottom:16px}
@media(max-width:850px){
  .grid,.stats{grid-template-columns:1fr 1fr}
  header{display:block}
}
@media print{
  body{background:white}
  .panel, header button, .actions{display:none}
  .app{max-width:none;padding:0}
  .sheet-card,.stat{box-shadow:none;border:1px solid #ddd;break-inside:avoid}
}