:root{--accent:#0b5fff}
  body{margin:0;}
  .wrap{max-width:1150px;margin:28px auto;display:grid;grid-template-columns:360px 1fr;gap:20px;padding:20px}
  .panel{background:#fff;border-radius:10px;box-shadow:0 6px 18px rgba(16,24,40,0.06);overflow:auto}
  h2{margin:0 0 12px 0;font-size:18px;color:var(--accent)}
  label{display:block;font-size:13px;color:#556;padding:6px 0 4px}
  input, select, textarea{width:100%;padding:8px;border:1px solid #e6edf3;border-radius:8px;background:#fbfdff}
  input[type="color"]{padding:2px;height:36px;cursor:pointer}
  .row{display:flex;gap:8px}
  .small{flex:1}
  button{cursor:pointer;padding:8px 10px;border-radius:8px;border:none;background:var(--accent);color:#fff;font-weight:600}
  button.ghost{background:#fff;color:var(--accent);border:1px solid #e6edf3}
  .preview-panel{background:#fff;padding:16px;border-radius:10px;box-shadow:0 6px 18px rgba(16,24,40,0.04)}
  textarea#htmlOutput{height:240px;font-family:monospace;font-size:13px}
  @media(max-width:800px){.wrap{grid-template-columns:1fr}}