.sidenav {
  text-align: center;
  height: 100%; 
  width: 0; 
  position: fixed; 
  z-index: 1; 
  top: 0; 
  left: 0;
  background-color: #f1f1f1; 
  overflow-x: hidden; 
  padding-top: 60px;
  transition: 0.5s;
}

.sidenav a {
  padding: 8px 8px 8px 32px;
  text-decoration: none;
  font-size: 25px;
  color: #111;
  display: block;
  transition: 0.3s;
}

.sidenav a:hover {
    display: block;
    color: #666;
}

.sidenav .closebtn {
  position: absolute;
  top: 0;
  right: 25px;
  font-size: 36px;
  margin-left: 50px;
}

.openbtn {
  /*color: #000;*/
  text-decoration: none;
  z-index: 1;
  position: 20px;
  top: 0;
  right: 0px;
  font-size: 36px;
  margin-top: 10px;
  font-size: 50px;
}

body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: #121212;
  color: #e0e0e0;
}

header {
  text-align: center;
  padding: 2rem 1rem;
  background-color: #1f1f1f;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 0.2rem;
}

h2 {
  color: #58a6ff;
}

h3 {
  color: #58a6ff;
  margin-top: 1.5rem;
}

h4 {
  color: #58a6ff;
  margin-top: 1rem;
}
.section {
  padding: 2rem;
  max-width: 800px;
  margin: auto;
}

ul {
  list-style-type: square;
  padding-left: 1.5rem;
}

a.button {
  display: inline-block;
  padding: 0.6rem 1rem;
  background-color: #333;
  color: #58a6ff;
  text-decoration: none;
  border-radius: 6px;
  margin-top: 1rem;
}

a.button:hover {
  background-color: #444;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #1f1f1f;
  font-size: 0.9rem;
  color: #999;
}

.logo {
  display: block;
  margin: 2rem auto 1rem auto;
  width: 120px;
  height: 120px;
  background-size: contain;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.main_content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.main_content > * {
  margin-left: auto;
  margin-right: auto;
}

.secondary_content {
  background: #23272f;
  color: #e0e0e0;
  padding: 1.5rem 2rem;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
  margin: 1.5rem 0;
  font-size: 1.1rem;
  line-height: 1.7;
}

a {
  color: #58a6ff;
  text-decoration: underline;
}