*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}

body {
  min-height: 100vh;
  max-width: 896px;
  margin: 0 auto;
  overflow-x: hidden;
  font-family: Arial, sans-serif;
  box-sizing: border-box;
  opacity: 0; 
  animation: fadeIn 1s forwards; 
}

/* Loading Page */
#loading {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background-color: #f3f3f3;
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeOut 1s 2s forwards;
}

.spinner {
  border: 16px solid #f3f3f3;
  border-top: 16px solid #3498db;
  border-radius: 50%;
  width: 120px;
  height: 120px;
  animation: spin 0.5s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes fadeOut {
  to {
    opacity: 0;
    visibility: hidden;
  }
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}


header {
  position: relative;
}

.hamburger,
.close {
  font-size: 2rem;
  cursor: pointer;
  margin: 1rem;
  display: inline-block;
}

.menu-toggle {
  display: none;
}

.menu-toggle:checked ~ nav {
  transform: translateY(0);
}

nav {
  display: flex;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  transform: translateY(-100%);
  transition: transform 0.5s ease;
  background-color: #eaeaeb;
}

nav ul {
  list-style: none;
  width: 100%;
  text-align: center;
  padding: 1rem 0;
}

nav a {
  text-decoration: none;
  color: #ff0000;
  font-size: 1.5rem;
  display: block;
  padding: 0.5rem 1rem;
  background-color: #eaeaeb;
  transition: background-color 2s, color 2s;
}

nav a:hover {
  color: white;
  background-color: #00aeff;
}

.close {
  position: absolute;
  top: 1rem;
  right: 1rem;
}

main {
  padding: 1rem;
}

main p {
  font-size: 1.25rem;
  line-height: 1.5;
}

@media screen and (min-width: 760px) {
  .hamburger,
  .close {
    display: none;
  }

  nav {
    position: static;
    transform: translateY(0);
  }

  nav ul {
    display: flex;
    justify-content: space-evenly;
  }

  nav a {
    padding: 1rem;
  }
}