* { box-sizing: border-box; }
  body { font-family: -apple-system, system-ui, "Segoe UI", Helvetica, Arial, sans-serif; background: #fafafa; color: #222; margin: 0; display: flex; min-height: 100vh; align-items: center; justify-content: center; padding: 16px; }
  .box { background: #fff; border: 1px solid #ddd; border-radius: 10px; box-shadow: 0 2px 14px rgba(0,0,0,0.08); padding: 28px; width: 100%; max-width: 360px; }
  h1 { font-size: 22px; margin: 0 0 4px; }
  p.sub { color: #888; font-size: 13px; margin: 0 0 18px; }
  label { display: block; font-size: 13px; color: #555; margin: 12px 0 4px; }
  input { width: 100%; padding: 10px 12px; border: 1px solid #ccc; border-radius: 6px; font-size: 15px; }
  button { width: 100%; margin-top: 18px; padding: 11px; border: 0; border-radius: 6px; background: #2a6fdc; color: #fff; font-size: 15px; cursor: pointer; }
  button:hover { background: #1e5bc4; }
  .err { color: #b13c3c; font-size: 13px; margin-top: 12px; min-height: 18px; }