body {
      font-family: Arial, sans-serif;
      background: #f2f2f2;
      margin: 0; padding: 0;
    }
        /* Duyuru çubuğu en üstte */
    .duyuru {
      background-color: #f59e0b;
      color: white;
      height: 35px;
      line-height: 35px;
      text-align: center;
      font-weight: bold;
      font-size: 16px;
      user-select: none;
      width: 100%;
      position: fixed;
      top: 0;
      left: 0;
      z-index: 1100;
      font-family: Arial, sans-serif;
    }

    /* Siyah başlık altında, duyuru yüksekliği kadar sayfa içeriği aşağı kayacak */
    .baslik {
      background-color: black;
      color: white;
      font-size: 28px;
      font-weight: bold;
      text-align: center;
      padding: 15px 0;
      margin-top: 35px; /* duyuru yüksekliği kadar boşluk bırak */
      user-select: none;
      font-family: Arial, sans-serif;
      position: sticky;
      top: 35px; /* duyuru altında sabit */
      z-index: 1050;
    }

    /* Sayfa içeriği duyuru ve başlık için aşağı kayacak */
    main {
      margin-top: 0;
      padding-top: 20px;
    }
    .container {
      max-width: 700px;
      width: 90%;
      background: white;
      margin: 50px auto;
      padding: 30px;
      border-radius: 10px;
      box-shadow: 0 0 15px rgba(0,0,0,0.1);
      box-sizing: border-box;
    }

    h2 {
      margin-bottom: 25px;
      color: #333;
      font-size: 1.8rem;
      text-align: center;
    }

    .form-group {
      margin-bottom: 20px;
    }

    label {
      font-weight: bold;
      display: block;
      margin-bottom: 8px;
      font-size: 1rem;
    }

    input[type="text"],
    input[type="tel"],
    textarea,
    select {
      width: 100%;
      padding: 12px;
      font-size: 16px;
      border-radius: 8px;
      border: 1px solid #ccc;
      box-sizing: border-box;
      transition: border-color 0.3s;
    }

    input[type="text"]:focus,
    input[type="tel"]:focus,
    textarea:focus,
    select:focus {
      border-color: #3498db;
      outline: none;
    }

    textarea {
      resize: vertical;
      min-height: 80px;
    }

    .paketler {
      margin-bottom: 25px;
    }

    .paket label {
      display: block;
      padding: 12px;
      border: 2px solid #ccc;
      border-radius: 8px;
      margin-bottom: 12px;
      cursor: pointer;
      background: #fafafa;
      font-size: 1rem;
      user-select: none;
      transition: border-color 0.3s, background-color 0.3s;
    }

    .paket input {
      margin-right: 10px;
      vertical-align: middle;
      cursor: pointer;
    }

    /* Radio checked styles */
    .paket input:checked + strong,
    .paket input:checked + span,
    .paket input:checked + label strong {
      color: #3498db;
    }
    .paket input:checked + strong {
      color: #3498db;
    }
    .paket input:checked + label,
    .paket input:checked + strong {
      border-color: #3498db;
      background-color: #eaf5fc;
    }

    button {
      background: #3498db;
      color: white;
      font-size: 18px;
      padding: 15px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      width: 100%;
      transition: background-color 0.3s;
    }

    button:hover {
      background: #2980b9;
    }

    /* Responsive adjustments */
    @media (max-width: 480px) {
      .container {
        margin: 20px auto;
        padding: 20px;
      }

      h2 {
        font-size: 1.5rem;
      }

      input[type="text"],
      input[type="tel"],
      textarea,
      select,
      .paket label {
        font-size: 1rem;
      }

      button {
        font-size: 16px;
        padding: 12px;
      }
    }