body {
      font-family: "Poppins", sans-serif;
      background: #f5f5f5;
      margin: 0;
      color: #333;
      transition: background 0.3s, color 0.3s;
    }

    main {
      max-width: 700px;
      margin: 60px auto;
      background: #fff;
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.15);
    }

    h1 {
      text-align: center;
      color: #003F6B;
      margin-bottom: 25px;
    }

    form {
      display: flex;
      flex-direction: column;
      gap: 15px;
    }

    label {
      font-weight: 500;
    }

    input,
    select,
    textarea {
      width: 100%;
      padding: 10px;
      border: 1px solid #ccc;
      border-radius: 6px;
      box-sizing: border-box;
      font-family: "Poppins", sans-serif;
    }

    textarea {
      resize: vertical;
      min-height: 100px;
    }

    button {
      background: #F9C031;
      border: none;
      padding: 12px;
      color: #fff;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      transition: background 0.3s;
    }

    button:hover {
      background: #D89A1E;
    }

    .msg {
      margin-top: 15px;
      padding: 10px;
      border-radius: 6px;
      font-weight: 500;
      text-align: center;
    }

    .ok {
      background: #e6f7e6;
      color: #2c662d;
    }

    .error {
      background: #fff3cd;
      color: #856404;
    }

    @media (max-width: 600px) {
      main {
        margin: 20px;
        padding: 20px;
      }
    }

    /* 🌙 MODO OSCURO */
    body.dark-mode {
      background: #121212;
      color: #f5f5f5;
    }

    body.dark-mode main {
      background: #1e1e1e;
      color: #f5f5f5;
      box-shadow: 0 3px 10px rgba(255, 255, 255, 0.05);
    }

    body.dark-mode h1 {
      color: #ffde59;
    }

    body.dark-mode input,
    body.dark-mode select,
    body.dark-mode textarea {
      background: #2b2b2b;
      color: #fff;
      border: 1px solid #444;
    }

    body.dark-mode button {
      background: #F9C031;
      color: #000;
    }