:root {
  --light: #eee;
  --dark: #333;
  --main-font: "Courier New", Courier, monospace;
}

header {
  display: flex;
  justify-content: space-between;
}

.page-title {
  padding: 4rem 0 2rem;
}

body {
  display: flex;
  flex-direction: column;
  font-size: 1.125rem;
  width: 100%;
  min-height: 100vh;
  padding: 5vh;
  margin: 0;
  box-sizing: border-box;
  justify-content: space-between;
  font-family: var(--main-font);
  background-color: var(--light);
  color: var(--dark);
  overflow-x: hidden;
}

main {
  flex: 1;
}

body.dark-mode {
  background-color: var(--dark);
  color: var(--light);
}

a {
  color: var(--dark);
  text-decoration: none;
}

body.dark-mode a {
  color: var(--light);
}

a {
  text-decoration: none;
}

h1,
h2,
h3,
h4 {
  margin: 0;
}

h1 {
  font-size: 3rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.5rem;
}
h4 {
  font-size: 1rem;
  font-weight: normal;
}

p,
a {
  font-size: 1.2rem;
}

p {
  text-align: justify;
  text-justify: inter-word;
  word-spacing: normal;
}

.toggle-checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-label {
  display: block;
  position: relative;
  width: 35px;
  height: 19px;
  background-color: var(--dark);
  border-radius: 34px;
  cursor: pointer;
  transition: background-color 0.3s;
}

body.dark-mode .toggle-label {
  background-color: var(--light);
}

.toggle-handle {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 15px;
  height: 15px;
  background-color: var(--light);
  border-radius: 50%;
  transition: transform 0.3s;
}

body.dark-mode .toggle-handle {
  background-color: var(--dark);
}

.toggle-checkbox:checked + .toggle-label .toggle-handle {
  transform: translateX(17px);
}

.menu-btn {
  background: none;
  border: none;
  cursor: pointer;
  z-index: 2;
  margin: 0;
  padding: 0;
}

.menu-btn span {
  display: block;
  width: 30px;
  height: 3px;
  background-color: var(--dark);
  margin: 5px 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

body.dark-mode .menu-btn span {
  background-color: var(--light);
}

.menu-btn.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-btn.open span:nth-child(2) {
  opacity: 0;
}

.menu-btn.open span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.menu {
  position: fixed;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background-color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transform: translateX(100%);
  transition: transform 0.5s ease;
  z-index: 1;
}

body.dark-mode .menu {
  background-color: #111;
}

.menu ul,
.menu li {
  padding: 0;
  margin: 0;
  list-style: none;
  text-align: center;
  line-height: 2.8rem;
}

.menu.open {
  transform: translateX(0);
}

.menu a {
  font-family: var(--main-font);
  font-size: 1.8rem;
  text-decoration: none;
  margin: 1rem 0;
  position: relative;
}

.menu a::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: var(--dark);
  visibility: hidden;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease-in-out;
}

body.dark-mode .menu a::before {
  background-color: var(--light);
}

.menu a:hover::before {
  visibility: visible;
  transform: scaleX(1);
}

.button a,
#submit {
  display: inline-block;
  text-decoration: none;
  font-family: var(--main-font);
  font-size: 1.2rem;
  font-weight: bold;
  line-height: 0;
  color: var(--dark);
  border: 1px solid var(--dark);
  border-radius: 4px;
  padding: 1.5rem;
  margin: 0;
  cursor: pointer;
  transition: all 0.5s;
  background-color: transparent;
}

.button a:hover,
#submit:hover {
  color: var(--light);
  background-color: var(--dark);
}

body.dark-mode .button a,
body.dark-mode #submit {
  color: var(--light);
  border-color: var(--light);
}

body.dark-mode .button a:hover,
body.dark-mode #submit:hover {
  color: var(--dark);
  background-color: var(--light);
}

footer {
  padding: 4rem 0 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}