/* Reset cơ bản */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
  }
  
  .container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
  }
  
  /* Header */
  .header {
    background: #fff;
    padding: 20px 0;
    border-bottom: 1px solid #eee;
  }
  
  .logo {
    font-size: 28px;
    font-weight: bold;
    color: #000;
  }
  
  .nav {
    margin-top: 10px;
  }
  
  .nav a {
    color: #333;
    text-decoration: none;
    margin: 0 15px;
    font-size: 16px;
    transition: color 0.3s;
  }
  
  .nav a:hover {
    color: #0077ff;
  }
  
  /* Hero section */
  .hero {
    background: url('/images/hero.jpg') center/cover no-repeat;
    color: #fff;
    text-align: center;
    padding: 100px 20px;
  }
  
  .hero h2 {
    font-size: 36px;
    margin-bottom: 10px;
  }
  
  .hero p {
    font-size: 20px;
    margin-bottom: 20px;
  }
  
  .btn-primary {
    display: inline-block;
    padding: 10px 20px;
    background: #0077ff;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
  }
  
  .btn-primary:hover {
    background: #005bb5;
  }
  
  /* About */
  .about, .services {
    padding: 60px 20px;
    text-align: center;
  }
  
  .about h2, .services h2 {
    margin-bottom: 20px;
    font-size: 28px;
  }
  
  /* Services */
  .service-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin-top: 30px;
  }
  
  .service-item {
    background: #f9f9f9;
    padding: 20px;
    border-radius: 10px;
    width: 300px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    cursor: pointer;
  }
  
  .service-item h3 {
    margin-bottom: 10px;
    font-size: 22px;
  }
  
  /* Footer */
  .footer {
    background: #f2f2f2;
    text-align: center;
    padding: 20px;
    font-size: 14px;
    margin-top: 50px;
  }
  
  /* Responsive */
  @media (max-width: 768px) {
    .service-list {
      flex-direction: column;
      align-items: center;
    }
  }