:root{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#111827}*{box-sizing:border-box}body{margin:0;background:#f3f4f6}.app{min-height:100vh;padding:16px;display:grid;grid-template-rows:auto auto;align-content:start;gap:16px}header p{margin:6px 0 0}header h1{margin:0;font-size:1.4rem}main{display:grid;grid-template-columns:minmax(320px,1fr);gap:16px}.panel{background:#fff;border-radius:8px;border:1px solid #e5e7eb;padding:14px}h2{margin-top:0;font-size:1rem}code{background:#f8fafc;border:1px solid #e2e8f0;border-radius:4px;padding:0 4px}button{border:0;border-radius:6px;padding:8px 12px;font-size:.9rem;background:#111827;color:#fff;cursor:pointer;border:1px solid #111827}button[disabled]{opacity:.5;cursor:default}input{padding:6px 8px;border:1px solid #cbd5e1;border-radius:6px;background:#fff}.upload,.download{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:8px 0}.download{flex-direction:column;align-items:flex-start}.download a{color:#374151}.error{color:#dc2626}.preview-stack{margin-top:8px;position:relative;width:100%}.preview-canvas,.preview-overlay{width:100%;height:auto;display:block}.preview-canvas{width:100%;height:auto;border:1px solid #e5e7eb;border-radius:8px}.preview-overlay{position:absolute;inset:0;pointer-events:auto;touch-action:none;cursor:crosshair}ul{padding-left:18px;margin-top:8px}li{margin-bottom:5px}@media (max-width: 1200px){main{grid-template-columns:1fr}}