* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #fff;
      color: #333;
    }

    header {
      position: relative;
      background: #007acc;
      padding: 80px 20px;
      text-align: center;
      color: #fff;
    }

    header h1 {
      font-size: 3rem;
      margin-bottom: 0.5rem;
    }

    header p {
      font-size: 1.2rem;
      margin-bottom: 25px;
    }

    header .btn-download {
      background: #ffcc00;
      color: #333;
      display: inline-block;
      padding: 16px 40px;
      font-size: 1.25rem;
      border-radius: 35px;
      cursor: pointer;
      text-decoration: none;
      font-weight: 600;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
      transition: transform .2s;
    }

    header .btn-download:hover {
      transform: scale(1.05);
    }

    .carousel {
      display: flex;
      gap: 10px;
      overflow-x: auto;
      padding: 20px;
      justify-content: center;
      background: #f0f8ff;
    }

    .carousel img {
      height: 200px;
      border-radius: 12px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    }

    .container {
      max-width: 1200px;
      margin: 40px auto;
      padding: 0 20px;
    }

    .intro,
    .features,
    .cta,
    footer {
      margin-bottom: 40px;
    }

    .intro {
      display: flex;
      gap: 40px;
      align-items: center;
      flex-wrap: wrap;
    }

    .intro-text {
      flex: 1 1 500px;
    }

    .intro-text h2 {
      color: #007acc;
      font-size: 2rem;
      margin-bottom: 20px;
    }

    .intro-text p,
    .intro-text ul {
      color: #555;
      font-size: 1.1rem;
      line-height: 1.8;
    }

    .intro-text ul {
      list-style: none;
      margin-top: 10px;
    }

    .intro-text ul li::before {
      content: "✔ ";
      color: #009cff;
    }

    .intro-img {
      flex: 1 1 400px;
    }

    .intro-img img {
      width: 100%;
      border-radius: 12px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }

    .features {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
    }

    .feature-box {
      border: 1px solid #eee;
      padding: 20px;
      border-radius: 12px;
      box-shadow: 0 5px 10px rgba(0, 0, 0, 0.05);
      text-align: center;
      transition: transform .3s;
    }

    .feature-box:hover {
      transform: translateY(-5px);
    }

    .feature-box h3 {
      color: #007acc;
      margin-bottom: 10px;
    }

    .cta {
      text-align: center;
    }

    .cta h2 {
      font-size: 2rem;
      color: #007acc;
      margin-bottom: 15px;
    }

    .cta a {
      background: #009cff;
      color: #fff;
      padding: 16px 40px;
      font-size: 1.2rem;
      border-radius: 35px;
      text-decoration: none;
      box-shadow: 0 8px 18px rgba(0, 156, 255, 0.4);
    }

    footer {
      background: #f9f9f9;
      text-align: center;
      padding: 30px;
      font-size: 0.9rem;
      color: #777;
    }

    @media(max-width:768px) {
      header h1 {
        font-size: 2.2rem;
      }

      .intro {
        flex-direction: column;
      }
    }