/* CSS básico */
body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f5f5f5;
}
header {
  background: #2d89ef;
  color: white;
  padding: 1em;
  text-align: center;
}
main {
  max-width: 900px;
  margin: 2em auto;
  background: white;
  padding: 2em;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h2 {
  color: #2d89ef;
}
form {
  margin-bottom: 2em;
}
label {
  display: block;
  margin: 0.5em 0 0.2em;
}
input, select, textarea {
  width: 100%;
  padding: 0.5em;
  margin-bottom: 1em;
  border: 1px solid #ccc;
  border-radius: 4px;
}
button {
  background: #2d89ef;
  color: white;
  border: none;
  padding: 0.7em 1.5em;
  border-radius: 4px;
  cursor: pointer;
}
button:hover {
  background: #1b5fbd;
}
.ad-section {
  background: #eaf3ff;
  padding: 1em;
  margin-bottom: 2em;
  border-left: 6px solid #2d89ef;
}
.success-msg {
  color: green;
  font-weight: bold;
  margin-bottom: 1em;
}