@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@200..900&display=swap');

:root {
  --background-color: #D4D7D8;
  --color: #171717;
  line-height: 1.6;
}

.dark-theme {
  --background-color: #171717;
  --color: #D4D7D8;
}

body {
  font-family: 'Noto Serif JP', Courier, monospace;
  font-size: clamp(14px, 2vw, 18px);
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 100vw;
}

a {
  color: var(--color);
}

nav {
  padding: 10px 0;
  text-align: center;
  margin-top: 1vw;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
}

nav a {
  position: relative;
  text-decoration: none;
  font-size: 18px;
  padding: 0.5vw 2vw;
  border-left: 1px solid var(--color);
}

nav a:first-child {
  border-left: none;
}


nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1px;
  background-color: var(--color);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s ease;
}

nav a:hover::after {
  transform: scaleX(1);
}

main {
  flex: 1;
  font-size: clamp(14px, 1.2vw, 20px);
  line-height: clamp(1.5, 2vw, 1.8);
}

main section {
  margin-left: 1em;
}

footer {
  border-top: var(--color) 1px solid;
  text-align: center;

}

hr {
  border: none;
  border-top: 1px solid var(--color);
  height: 0;
  width: 100%;
  flex: 0 0 100%;
}


#nav-toggle {
  color: var(--background-color);
  background-color: var(--color);
  border: 0;
  font-size: clamp(1.8em, 3vw, 2em);
  cursor: pointer;
  position: absolute;
  top: clamp(10px, 1.5vw, 20px);
  right: clamp(10px, 1.5vw, 20px);
  z-index: 1000;
}

.hide {
  display: none;
}

.show {
  display: block;
}

.menu-toggle {
  position:fixed;
  right: 0;
  margin: 10px;
  font-size: 1.5rem;
  background-color: var(--color);
  color: var(--background-color);
  cursor: pointer;
  border-radius: 5px;
}

@media (max-width: 600px) {
  nav {
    display: none;
  }

  nav a {
    display: block;
    border: none;
  }

}

@media (min-width: 600px) {
  .menu-toggle {
    display: none;
  }
}