*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#0b0b0d;color:#fff}
.app{width:min(1180px,100%);margin:0 auto;display:grid;grid-template-columns:290px 1fr;gap:22px;padding:18px;align-items:start}
.panel{background:#151515;border:1px solid #333;border-radius:18px;padding:20px;align-self:start;position:sticky;top:18px}
h1{margin:0 0 8px;font-size:24px}.subtitle{margin:0 0 18px;color:#cfcfcf;line-height:1.4;font-size:14px}.btn,.secondary{width:100%;border:0;border-radius:12px;padding:14px 16px;font-weight:800;cursor:pointer;font-size:15px}.file-btn{display:block;text-align:center;background:#c91616;color:white;margin:16px 0}.download{background:linear-gradient(90deg,#d49b12,#ffe26a);color:#111;margin-top:16px}.secondary{background:#292929;color:#fff;border:1px solid #555;margin:12px 0}.field{display:block;margin:14px 0 10px;color:#ddd;font-weight:700;font-size:14px}.field select{width:100%;margin-top:8px;padding:12px;border-radius:10px;background:#0e0e0e;color:#fff;border:1px solid #555;font-size:15px}.controls{margin:18px 0}.controls label{display:block;margin-bottom:10px;font-weight:700;font-size:14px}.controls input{width:100%}.moveBtns{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.moveBtns button{padding:10px;border-radius:10px;border:1px solid #555;background:#202020;color:white;font-size:18px;cursor:pointer}.previewWrap{display:flex;align-items:flex-start;justify-content:center;overflow:auto;max-height:calc(100vh - 36px);padding-bottom:10px}canvas{width:min(860px,100%);height:auto;border-radius:12px;background:#eee;box-shadow:0 20px 80px rgba(0,0,0,.45)}@media(max-width:900px){.app{grid-template-columns:1fr;padding:14px}.panel{position:static}.previewWrap{max-height:none}canvas{width:100%}}