index.css

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

:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  --palettes-1: #303841;
  --palettes-2: #3a4750;
  --palettes-3: #d72323;
  --palettes-4: #eeeeee;
  --palettes-5: #6ae24c;
  color: var(--palettes-4);
  user-select: none;
}

/* Universal */

fieldset {
  margin: 1rem 0 0 0;
  padding: 1.5rem;
  position: relative;
  background-color: var(--palettes-1);
  border: none;
}

legend {
  position: absolute;
  top: 5%;
  font-size: 1.75rem;
  font-weight: bold;
}

label {
  font-weight: bold;
}

input {
  background-color: var(--palettes-2);
  color: var(--palettes-4);
  font-size: 1rem;
  margin-top: 0.2rem;
  user-select: text !important;
}

label:not(:last-of-type) input {
  flex: 1;
}

input {
  border: 2px solid transparent;
  outline: none;
  border-bottom: 2px solid var(--palettes-3);
  caret-color: var(--palettes-4);
  padding: 5px;
  transition: 0.1s linear;
  font-family: monospace;
  letter-spacing: 1px;
}

input:focus {
  border: 2px solid var(--palettes-3);
  caret-color: var(--palettes-3);
  color: var(--palettes-3);
  box-shadow: 0 0 10px #272f36;
}

button[type="submit"] {
  font-size: 1.5rem;
  color: var(--palettes-4);
  font-family: inherit;
  font-weight: bold;
  cursor: pointer;
  position: relative;
  border: none;
  background: none;
  text-transform: uppercase;
  transition-timing-function: cubic-bezier(0.25, 0.8, 0.25, 1);
  transition-duration: 0.6s;
  transition-property: color;
}

button[type="submit"]:active {
  transition-duration: 0.01;
  color: var(--palettes-3);
}

button[type="submit"]:active:after,
button[type="submit"]:hover:after {
  width: 100%;
  left: 0%;
}

button[type="submit"]:after {
  content: "";
  pointer-events: none;
  bottom: -2px;
  left: 50%;
  position: absolute;
  width: 0%;
  height: 2px;
  background-color: var(--palettes-3);
  transition-timing-function: cubic-bezier(0.25, 0.8, 0.25, 1);
  transition-duration: 0.6s;
  transition-property: width, left;
}

/* Modal */

#modal {
  display: flex; /* default none, debugging flex */
  position: fixed;
  z-index: 100;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4);

  transition: 0.1s ease-in;
  visibility: hidden;
  opacity: 0;
}

#modal.displayed {
  visibility: visible;
  opacity: 100;
}

#modal .settings-modal-content {
  margin: auto;
  min-width: 25%;
}

#update-book {
  margin: 0;
  transition: 0.25s cubic-bezier(0, 0, 0.15, 1);
  scale: 0;
  box-shadow: 0 0 200px 20px rgba(0, 0, 0, 0.2);
}

#update-book.displayed {
  scale: 1;
}

#update-form {
  display: flex;
  flex-direction: column;
}

#update-form label {
  margin-bottom: 1rem;
}

#update-form label:not(:last-of-type) {
  display: flex;
  flex-direction: column;
}

/* Primary container */

.container {
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--palettes-4);
  overflow: auto;
}

.container fieldset {
  padding-top: 5rem;
}

/* Book form */

.add-book {
  width: 80%;
  height: fit-content;
  box-shadow: 0 0 15px 2px var(--palettes-1);
}

#book-form {
  display: flex;
  flex-direction: column;
}

#book-form label {
  margin-bottom: 1rem;
}

#book-form label:not(:last-of-type) {
  display: flex;
  flex-direction: column;
}

/* Library */

#library {
  margin: 1rem 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  width: 80%;
}

#library div {
  display: grid;
  grid-template-columns: max-content 1fr;
  /* grid-auto-rows: min-content; */
  position: relative;
  background-color: var(--palettes-1);
  padding: 1rem 3rem 1rem 2.25rem;
  border-radius: 0 25px 25px 0;
  box-shadow: 0 0 15px 2px var(--palettes-1);
  user-select: text;
  overflow: hidden;
  /* height: max-content;  */
}

#library div p:nth-child(odd) {
  margin-left: auto;
}

#library div p:nth-child(even) {
  padding-left: 0.5rem;
}

#library .card-author {
  border-top: 1px solid rgba(119, 119, 119, 0.2);
  border-bottom: 1px solid rgba(119, 119, 119, 0.2);
  margin-top: 0.5rem;
  margin-bottom: 0.5rem;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

#library div::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 1rem;

  background-color: var(--palettes-3);
  box-shadow: -10px 0 25px 12px var(--palettes-3);
  clip-path: inset(0 -1000px 0 0);

  transition: 0.1s ease-out;
}

#library div.finished::before {
  background-color: var(--palettes-5);
  box-shadow: -10px 0 25px 12px var(--palettes-5);
}

#library div:hover::before {
  box-shadow: -10px 0 25px 16px var(--palettes-3);
}

#library div.finished:hover::before {
  box-shadow: -10px 0 25px 16px var(--palettes-5);
}

#library .delete-button {
  bottom: 1rem;
}

#library .settings-button {
  top: 1rem;
}

#library img {
  position: absolute;
  height: 2rem;
  width: 2rem;
  right: 1rem;

  border: none;
  background-color: transparent;

  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
  transition: 0.05s ease-out;
}

#library img:hover {
  scale: 1.08;
}