body {
    margin: 0;
    font-family: 'Kanit', sans-serif;
    background-color: #f4f4f4;
    color: #333;
  }
  
  header {
    background-color: #1E3A5F;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
  }
  
  .logo {
    font-size: 1.5rem;
    font-weight: bold;
  }
  
  nav a {
    color: white;
    margin-left: 1.5rem;
    text-decoration: none;
    font-size: 1rem;
  }
  
  .login-btn {
    background-color: #2ECC71;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    color: white;
    text-decoration: none;
  }
  
  .hero {
    background: linear-gradient(to right, #1E3A5F, #34495E);
    color: white;
    text-align: center;
    padding: 80px 20px;
  }
  
  .hero h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
  }
  
  .hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
  }
  
  .btn {
    background-color: #2ECC71;
    border: none;
    padding: 0.8rem 2rem;
    color: white;
    font-size: 1rem;
    border-radius: 6px;
    cursor: pointer;
    margin: 0 0.5rem;
  }
  
  .btn-outline {
    background-color: transparent;
    border: 1px solid #2ECC71;
    color: #2ECC71;
  }
  
  .section {
    padding: 60px 20px;
    text-align: center;
    background-color: #ffffff;
  }
  
  .features {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 30px;
  }
  
  .feature-box {
    background-color: #ecf0f1;
    border-radius: 8px;
    padding: 20px;
    flex: 1 1 200px;
    max-width: 250px;
  }
  
  .contact {
    background-color: #f8f9fa;
    padding: 40px 20px;
    text-align: center;
  }
  
  footer {
    background-color: #1E3A5F;
    color: #ccc;
    text-align: center;
    padding: 1rem;
    font-size: 0.9rem;
  }
  .logo-group {
    display: flex;
    align-items: center;
  }
  
  .logo-img {
    height: 60px;
  width: 60px;
  object-fit: cover;
  border-radius: 50%; /* ทำให้เป็นวงกลม */
  margin-right: 5px;
  border: 1px solid white; /* เส้นขอบสีขาว (ถ้าต้องการ) */
  }
  
  .logo-text {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
  }
  .page-content {
    max-width: 800px;
    margin: auto;
    padding: 60px 20px;
    background-color: #fff;
  }
  
  .page-content h1, .page-content h2 {
    color: #1E3A5F;
    margin-bottom: 1rem;
  }
  
  .page-content ul, .page-content ol {
    padding-left: 20px;
    margin-bottom: 1.5rem;
  }
  
  .contact-info p {
    margin: 0.3rem 0;
  }
  
  nav .active {
    font-weight: bold;
    text-decoration: underline;
  }
  .manual-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 30px;
  }
  
  .manual-item {
    background: #F5F5F5;
    padding: 20px;
    border-left: 6px solid #1E3A5F;
    border-radius: 8px;
  }
  
  .manual-item h3 {
    margin-bottom: 8px;
    color: #1E3A5F;
  }
  
  .manual-item p {
    margin-bottom: 12px;
  }
  
  
  
  .btn.btn-outline:hover {
    background-color: #1E3A5F;
    color: white;
  }