:root {
  --primary-color: #009688;
  --secondary-color: #eee;
  --add-color: #9c27b0;
  --close-color: #f44336;
  --remove-color: #e91e63;
  --change-color: brown;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  background-color: var(--secondary-color);
}
.container {
  min-height: 100vh;
  width: 1100px;
  margin: auto;
  background-color: white;
}

h1 {
  text-align: center;
  padding: 35px;
  margin-bottom: 30px;
  border-bottom: 2px solid var(--secondary-color);
  font-size: 40px;
}
.show-dialog {
  display: block;
  width: 230px;
  margin: auto;
  padding: 14px 0;
  background-color: var(--primary-color);
  color: white;
  font-size: 18px;
  font-weight: bold;
  border: 3px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.3s;
}
.show-dialog:hover {
  border-color: var(--primary-color);
  background-color: transparent;
  color: var(--primary-color);
}

dialog {
  width: 580px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 20px;
  border-radius: 8px;
  border-color: var(--primary-color);
  background-color: var(--secondary-color);
}
dialog form {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}
dialog form > div {
  width: calc((100% - 20px) / 2);
}
dialog form > div label {
  display: block;
  margin-bottom: 5px;
  font-size: 17px;
  font-weight: bold;
  letter-spacing: 1px;
}
dialog form > div input,
dialog form > div select {
  height: 34px;
  padding: 0 10px;
  width: 100%;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  outline-color: var(--primary-color);
}
dialog form > div:last-of-type {
  width: 100%;
  display: flex;
  gap: 20px;
}
dialog form > div button {
  flex: 1;
  height: 45px;
  font-size: 18px;
  font-weight: bold;
  color: white;
  cursor: pointer;
  border: 3px solid transparent;
  border-radius: 6px;
  outline: none;
  transition: 0.3s;
}

dialog form > div button:first-of-type {
  background-color: var(--add-color);
}
dialog form > div button:first-of-type:hover,
dialog form > div button:last-of-type:hover {
  background-color: transparent;
}
dialog form > div button:first-of-type:hover {
  border-color: var(--add-color);
  color: var(--add-color);
}
dialog form > div button:last-of-type:hover {
  border-color: var(--close-color);
  color: var(--close-color);
}
dialog form > div button:last-of-type {
  background-color: var(--close-color);
}

h2 {
  text-align: center;
  font-size: 28px;
  margin: 30px 0;
  padding: 0 0 30px;
  border-bottom: 2px solid var(--secondary-color);
}

.books {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
  gap: 25px;
  padding: 0 15px;
}
.books .empty-msg {
  font-size: 22px;
  font-weight: bold;
}
.books .card {
  padding: 20px;
  background-color: var(--secondary-color);
  border-radius: 8px;
  box-shadow: 5px 5px 10px rgb(0 0 0 / 22%);
}
.books .card h3 {
  text-align: center;
  font-size: 30px;
  margin-bottom: 20px;
  letter-spacing: 2px;
  color: var(--primary-color);
}
.books .card > div:not(.buttons) {
  display: flex;
  justify-content: space-between;
  font-size: 20px;
  margin-bottom: 15px;
}
.books .card div span {
  display: inline-block;
  width: 50%;
  font-weight: bold;
  font-size: 18px;
  color: var(--primary-color);
}
.books .card .buttons {
  display: flex;
  gap: 20px;
}
.books .card .buttons button {
  flex: 1;
  height: 45px;
  color: white;
  border: 2px solid transparent;
  border-radius: 6px;
  font-size: 17px;
  font-weight: bold;
  letter-spacing: 1px;
  cursor: pointer;
  transition: 0.3s;
}
.books .card .buttons button.remove {
  background-color: var(--remove-color);
}
.books .card .buttons button.remove:hover {
  background-color: transparent;
  border-color: var(--remove-color);
  color: var(--remove-color);
}
.books .card .buttons button.change {
  background-color: var(--change-color);
}

.books .card .buttons button.change:hover {
  background-color: transparent;
  border-color: var(--change-color);
  color: var(--change-color);
}