body {
      font-family: 'Helvetica Neue', Arial, sans-serif;
      margin: 0;
      background-color: #f5f5f5;
      color: #333;
      line-height: 1.8;
    }
    header {
      background: linear-gradient(120deg, #111, #444);
      color: white;
      text-align: center;
      padding: 70px 20px;
    }
    header h1 {
      font-size: 2.4rem;
      margin: 0;
      font-weight: 700;
    }
    header p {
      color: #ccc;
      margin-top: 10px;
      font-size: 1.1rem;
    }
    main {
      max-width: 950px;
      margin: 60px auto;
      padding: 25px;
      background: white;
      border-radius: 15px;
      box-shadow: 0 6px 25px rgba(0,0,0,0.08);
    }
    h2 {
      color: #111;
      border-left: 5px solid #4a90e2;
      padding-left: 12px;
      margin-top: 50px;
      font-weight: 600;
    }
    h3 {
      color: #444;
      margin-top: 30px;
    }
    p {
      font-size: 1.05rem;
      margin-bottom: 20px;
    }
    ul {
      padding-left: 25px;
    }
    li {
      margin-bottom: 10px;
    }
    img.responsive {
      width: 100%;
      height: auto;
      border-radius: 12px;
      margin: 25px 0;
    }
    a.cta {
      display: inline-block;
      background: #4a90e2;
      color: white;
      padding: 15px 35px;
      margin-top: 40px;
      border-radius: 40px;
      text-decoration: none;
      font-weight: bold;
      transition: 0.3s ease;
    }
    a.cta:hover {
      background: #1a73e8;
      transform: translateY(-2px);
    }
    footer {
      text-align: center;
      padding: 40px 20px;
      background: #111;
      color: #bbb;
      font-size: 0.9rem;
    }
    footer a {
      color: #4a90e2;
      text-decoration: none;
    }
    @media (max-width: 768px) {
      header h1 { font-size: 1.9rem; }
      main { margin: 20px; padding: 20px; }
    }