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

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.7;
  color: #222;
  background-color: #ffffff;
}


#navbar {
  position: fixed;
  top: 0;
  left: 0;

  width: 280px;
  height: 100vh;

  background-color: #f4f4f4;

  border-right: 1px solid #d0d0d0;

  overflow-y: auto;
}

#navbar header {
  font-size: 1.4rem;
  font-weight: bold;

  padding: 25px 20px;

  color: #111;

  border-bottom: 1px solid #d0d0d0;
}

.nav-link {
  display: block;

  padding: 15px 20px;

  color: #333;

  text-decoration: none;

  border-bottom: 1px solid #ddd;

  transition: background-color 0.2s ease;
}

.nav-link:hover {
  background-color: #e5e5e5;
}



#main-doc {
  margin-left: 280px;

  padding: 40px 50px;

  max-width: 1000px;
}



.main-section {
  margin-bottom: 50px;
}

.main-section header {
  font-size: 1.8rem;
  font-weight: bold;

  margin-bottom: 20px;

  color: #111;
}

.main-section p {
  margin-bottom: 15px;
}



.main-section ul {
  margin: 15px 0 20px 25px;
}

.main-section li {
  margin-bottom: 8px;
}



.main-section code {
  display: block;

  background-color: #f4f4f4;

  border-left: 4px solid #333;

  padding: 15px;

  margin: 15px 0;

  font-family: "Courier New", monospace;

  white-space: pre-wrap;

  overflow-x: auto;
}


@media (max-width: 700px) {

  #navbar {
    position: relative;

    width: 100%;

    height: auto;

    border-right: none;

    border-bottom: 1px solid #d0d0d0;
  }

  #navbar header {
    text-align: center;
  }

  .nav-link {
    text-align: center;
  }

  #main-doc {
    margin-left: 0;

    padding: 30px 20px;
  }

  .main-section header {
    font-size: 1.5rem;
  }

}