body{
 background:linear-gradient(135deg,#4f46e5,#6366f1);
 font-family:Inter,Arial;
 margin:0;min-height:100vh;
}
.wrap{display:flex;max-width:1200px;margin:40px auto}
.builder,.preview{
 background:#fff;padding:30px;border-radius:16px;
 box-shadow:0 20px 40px rgba(0,0,0,.15);margin:10px;flex:1;
}
.tabs button{
 background:#eef2ff;border:none;padding:10px 16px;
 border-radius:8px;margin-right:8px;cursor:pointer
}
input,select{width:100%;padding:12px;border-radius:8px;border:1px solid #ddd;margin:8px 0}
.add,.main{background:#4f46e5;color:#fff;border:none;padding:14px;border-radius:10px;margin-top:12px;cursor:pointer}
.preview h3{margin-top:0}