* { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Inter', sans-serif;
      background-color: #f9f9f9;
      color: #111;
    }
    header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: nowrap;
      padding: 30px 60px;
      background: #1a73e8;
      color: white;
      box-shadow: 0 2px 8px rgba(0,0,0,0.05);
      position: relative;
    }
    header h1 {
      font-weight: 800;
      font-size: 32px;
      display: flex;
      align-items: center;
      gap: 20px;
    }
    nav {
      display: flex;
      flex-wrap: wrap;
      justify-content: flex-end;
      align-items: center;
      transition: max-height 0.3s ease, opacity 0.3s ease;
    }
    nav a {
      margin-left: 30px;
      text-decoration: none;
      color: white;
      font-weight: 600;
      font-size: 18px;
      white-space: nowrap;
    }
    .login {
      padding: 10px 20px;
      border: 2px solid white;
      border-radius: 8px;
      color: white;
    }
    .login:hover {
      background: white;
      color: #1a73e8;
    }
    .menu-toggle {
      display: none;
      font-size: 28px;
      cursor: pointer;
      background: none;
      border: none;
      color: white;
      margin-left: 20px;
    }
    .hero {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      padding: 80px 60px;
      background: #fff;
    }
    .hero-text {
      max-width: 600px;
    }
    .hero-text h2 {
      font-size: 44px;
      font-weight: 800;
      margin-bottom: 24px;
    }
    .hero-text p {
      font-size: 20px;
      margin-bottom: 32px;
    }
    .hero-text a {
      padding: 14px 32px;
      background: #1a73e8;
      color: white;
      text-decoration: none;
      border-radius: 10px;
      font-weight: 600;
      font-size: 18px;
      transition: all 0.3s ease;
    }
    .hero-text a:hover {
      background: #0059c1;
      transform: scale(1.05);
    }
    .hero-img {
      flex: 1;
      text-align: center;
      padding: 20px;
    }
    .hero-img img {
      max-width: 100%;
      max-height: 400px;
      height: auto;
    }
    .courses {
      padding: 80px 60px;
      background: #f1f3f4;
    }
    .courses h3 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 40px;
    }
    .course-list {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
    }
    .course {
      flex: 1 1 260px;
      background: white;
      padding: 24px;
      border-radius: 12px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    }
    .course .icon {
      width: 48px;
      height: 48px;
      background: #1a73e8;
      border-radius: 10px;
      margin-bottom: 14px;
    }
    .course h4 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .course p {
      font-size: 15px;
      color: #555;
    }
    .testimonials {
      background: #ffffff;
      padding: 60px 40px;
      text-align: center;
    }
    .testimonials h3 {
      font-size: 26px;
      margin-bottom: 40px;
    }
    .testimonial {
      background: #f1f3f4;
      border-radius: 16px;
      padding: 20px 30px;
      margin: 20px auto;
      max-width: 600px;
      font-size: 17px;
      color: #333;
      position: relative;
    }
    .testimonial::before {
      content: "\201C";
      font-size: 48px;
      color: #1a73e8;
      position: absolute;
      top: -20px;
      left: 20px;
    }
    .testimonial strong {
      display: block;
      margin-top: 15px;
      color: #1a73e8;
    }
    footer {
      text-align: center;
      padding: 40px 20px;
      background: #1a1a1a;
      color: #ccc;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      nav {
        display: none;
        flex-direction: column;
        background: #1a73e8;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        padding: 10px 20px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.05);
        opacity: 0;
        max-height: 0;
        overflow: hidden;
      }
      nav.show {
        display: flex;
        opacity: 1;
        max-height: 300px;
      }
      .menu-toggle {
        display: block;
      }
      header {
        flex-direction: column;
        align-items: flex-start;
      }
      header h1 {
        flex-direction: row;
        width: 100%;
        justify-content: space-between;
      }
    }