body {
    margin: 0;
    font-family: 'Kanit', sans-serif;
    background: linear-gradient(to right, #004d66, #00334d); /* โทนน้ำเงินเข้ม */
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    color: #333;
  }
  
  .register-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
  }
  
  .register-box {
    background: #fff;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    text-align: center;
  }
  
  .register-box h2 {
    color: #004d66;
    margin-bottom: 20px;
  }
  
  .register-box .logo img {
    width: 80px;
    margin-bottom: 10px;
  }
  
  input[type="text"],
  input[type="password"],
  input[type="email"] {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 1rem;
    box-sizing: border-box;
  }
  
  button {
    background-color: #28a745; /* สีเขียว */
    color: white;
    padding: 12px;
    font-size: 1rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s ease;
  }
  
  button:hover {
    background-color: #218838;
  }
  
  .login-link {
    margin-top: 15px;
  }
  
  .login-link a {
    color: #004d66;
    text-decoration: none;
    font-weight: bold;
  }
  
  .login-link a:hover {
    text-decoration: underline;
  }