/* Genel Ayarlar */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #f9f9f9;
    color: #333;
    line-height: 1.6;
  }
  
  a {
    color: #0d6efd;
    text-decoration: none;
  }
  
  a:hover {
    text-decoration: underline;
  }
  
  /* Başlık ve Navigasyon */
  header {
    background-color: #212529;
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
  }
  
  .logo a {
    font-size: 1.5em;
    font-weight: bold;
    color: white;
  }
  
  nav {
    display: flex;
    gap: 15px;
  }
  
  nav a {
    color: white;
    font-weight: 500;
  }
  
  .auth-buttons a {
    margin-left: 10px;
    padding: 8px 16px;
    background-color: #0d6efd;
    color: white;
    border-radius: 4px;
    transition: background 0.3s;
  }
  
  .auth-buttons a:hover {
    background-color: #0b5ed7;
  }
  
  /* Ana İçerik */
  main {
    max-width: 960px;
    margin: 40px auto;
    padding: 0 20px;
  }
  
  h1, h2 {
    color: #343a40;
    margin-bottom: 15px;
  }
  
  section {
    margin-bottom: 40px;
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 0 8px rgba(0,0,0,0.05);
  }
  
  /* Slogan */
  .slogan {
    background-color: #e9ecef;
    text-align: center;
    padding: 40px 20px;
    border-radius: 8px;
    margin-bottom: 40px;
  }
  
  .slogan h1 {
    color: #0d6efd;
    margin-bottom: 10px;
  }
  
  /* Plan Kartları */
  .planlar {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .plan {
    flex: 1;
    min-width: 250px;
    background: #f1f1f1;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
  }
  
  .plan h2 {
    margin-bottom: 10px;
  }
  
  .plan button {
    background-color: #198754;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    margin-top: 10px;
    cursor: pointer;
    font-size: 1em;
  }
  
  .plan button:hover {
    background-color: #157347;
  }
  
  /* Formlar */
  form {
    background-color: #ffffff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 0 8px rgba(0,0,0,0.05);
  }
  
  input[type="text"],
  input[type="email"],
  input[type="password"],
  textarea {
    width: 100%;
    padding: 10px;
    margin: 8px 0 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
  }
  
  button[type="submit"] {
    background-color: #0d6efd;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1em;
  }
  
  button[type="submit"]:hover {
    background-color: #0b5ed7;
  }
  
  /* Footer */
  footer {
    background-color: #dee2e6;
    text-align: center;
    padding: 20px;
    font-size: 0.9em;
    margin-top: 60px;
  }
  
  /* Mobil Uyum */
  @media (max-width: 768px) {
    header {
      flex-direction: column;
      align-items: flex-start;
    }
    nav {
      margin-top: 15px;
      flex-wrap: wrap;
    }
    .auth-buttons {
      margin-top: 15px;
    }
  }