body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(to bottom right, #fdf0ff, #f0f8ff);
  margin: 0;
  padding: 0;
  color: #333;
}
header {
  text-align: center;
  padding: 30px 20px 10px;
}
header img {
  width: 140px;
  border-radius: 50%;
}
header img {
width: 140px;
border-radius: 50%;
animation: float 2.5s ease-in-out infinite;
}
@keyframes float {
0% { transform: translateY(0); }
50% { transform: translateY(-10px); }
100% { transform: translateY(0); }
}
h1 {
  font-size: 2rem;
  margin-top: 12px;
}
.container {
  max-width: 800px;
  margin: 30px auto;
  background: #fff;
  padding: 24px;
  border-radius: 16px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}
.lesson-section {
  margin-bottom: 32px;
}
code {
  background: #f4f4f4;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.95rem;
}
pre {
  background: #f6f6ff;
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.95rem;
}
.btn {
  display: inline-block;
  margin-top: 12px;
  padding: 10px 20px;
  background-color: #ff7ad9;
  color: white;
  text-decoration: none;
  border-radius: 10px;
  font-weight: bold;
}
.btn:hover {
  background-color: #e55cc7;
}

.next-les a{
    text-decoration: none;
    background: linear-gradient(135deg, rgb(72, 72, 239), rgb(254, 74, 104));
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }


@media (max-width: 768px) {
  header img {
    width: 100px;
  }

  h1 {
    font-size: 1.5rem;
  }

  .container {
    padding: 16px;
    margin: 20px 12px;
  }

  .btn,
  .home-btn {
    width: 100%;
    max-width: 300px;
    margin: 12px auto;
    text-align: center;
    font-size: 1rem;
  }

  pre {
    font-size: 0.85rem;
  }

  code {
    font-size: 0.85rem;
  }

  .lesson-section {
    margin-bottom: 24px;
  }
}