body { font-family: Arial, sans-serif; margin: 20px; background: #fafafa; }
h1 { margin-bottom: 10px; }
.builder { display: flex; gap: 30px; }
.options, .summary { flex: 1; }
select, button { margin: 5px 0; width: 100%; padding: 5px; }
.stat-block { background: #f4f4f4; padding: 10px; border-radius: 5px; }
#validationMessages { color: red; margin-top: 10px; }