@import url('https://fonts.googleapis.com/css2?family=Lato:ital,wght@0,300;0,400;0,700;0,900;1,300&display=swap');

* {
  margin: 0;
  padding: 0;
}

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

html {
  font-size: 62.5%;
  box-sizing: border-box;
}

body {
  font-family: 'Lato', sans-serif;
  font-weight: 400;
}

.container {
  padding: 10rem 45rem;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 2px solid #000;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.nav-heading {
  font-size: 1.8rem;
  font-weight: 900;
  cursor: pointer;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links li {
  font-size: 1.8rem;
  font-weight: 700;
  cursor: pointer;
}

.list-page,
.add-page,
.contact-page {
  transition: all 0.3s;
}

.list-page:hover,
.add-page:hover,
.contact-page:hover {
  transform: scale(1.03);
  color: grey;
}

.date-input {
  display: flex;
  font-size: 1.4rem;
  font-weight: 700;
  justify-content: flex-end;
  margin-bottom: 3.5rem;
}

.heading {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
}

.book-container {
  border: 2px solid #000;
  margin-bottom: 2.5rem;
}

.black-line {
  display: flex;
  margin: 0 auto;
  border: 1px solid #000;
  width: 70px;
  margin-bottom: 2.5rem;
}

.highlighted-books {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0.5rem 0.2rem;
  gap: 20rem;
}

.highlighted-books:nth-child(odd) {
  background-color: #eee;
}

.highlighted-books:nth-child(even) {
  background-color: #fff;
}

.added-book {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.remove-book {
  border: 2px solid #000;
  background-color: #fff;
  padding: 0.5rem;
  transition: all 0.3s;
}

.add-book {
  padding: 0.3rem 0.7rem;
  border: 2px solid #000;
  transition: all 0.3s;
  align-self: flex-end;
}

.remove-book:hover,
.add-book:hover {
  transform: scale(1.05);
  box-shadow: 0 0.5rem 4rem rgba(0, 0, 0, 0.4);
}

.form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  width: 70%;
  margin: 3rem auto 0;
}

.form-heading {
  font-size: 3rem;
  font-weight: 700;
}

.book-title,
.book-author {
  width: 100%;
  padding: 1rem;
  border: 2px solid #000;
}

.contact {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.reach-out {
  font-size: 1.7rem;
  font-weight: 700;
  margin-top: 3rem;
}

.reach-out-list {
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-left: 6rem;
}

.footer {
  width: 100%;
  border: 2px solid #000;
  padding: 1rem;
  margin-top: 12rem;
}

.copyright {
  font-size: 1.5rem;
}

.display-msg {
  padding: 2rem;
  font-size: 1.5rem;
}

.hidden {
  display: none;
}

.active {
  color: red;
}