:root {
  --bg-color: rgba(255, 255, 255, 0.1);
  --border-blurry: rgba(255, 255, 255, 0.025);
  --blur-amount: blur(48px);
  --blur-shadow: 0px 0px 16px 0px rgba(0, 0, 0, 0.5);
  --bd-radius: 12px;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  background: url("../img/library.png");
  background-size: cover;
  min-height: 100vh;
  margin: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#popup,
#book,
#library #book-adder,
header,
footer {
  background-color: var(--bg-color);
  backdrop-filter: var(--blur-amount);
  border: solid 2px var(--border-blurry);
  box-shadow: var(--blur-shadow);
}

#list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

#popup {
  /* display: flex; */
  display: none;
  justify-content: center;
  align-items: center;
  gap: 12px;
  border-radius: var(--bd-radius);
}

#library-container {
  display: flex;
  flex-wrap: wrap;
  flex-grow: 1;
  padding-top: 12px;
}

#library {
  display: flex;
  align-content: flex-start;
  flex-wrap: wrap;
  gap: 12px;
}

#book-adder {
  width: 48px;
  height: 48px;
  border-radius: 48px;
}

input,
form button,
#list button {
  background-color: var(--bg-color);
  border: solid 2px var(--border-blurry);
  color: white;
  padding: 8px;
  border-radius: 16px;
}

#book {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 150px;
  padding: 12px;
  color: white;
  text-align: center;
  text-wrap: wrap;
  border-radius: var(--bd-radius);
}

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

#book p {
  margin: 8px;
}

#book button {
  color: white;
  margin-top: 12px;
  border-radius: var(--bd-radius);
}

form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--bd-radius);
  color: white;
}

h1 {
  margin: 12px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: white;
  border-radius: 16px;
  flex-wrap: wrap;
}

header #left-side {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 10px; /* Emoji icon causes it to look uneven at 16px */
}
header #right-side {
  display: flex;
  align-items: center;
}

header #change-bg-wrapper,
header #reset-bg {
  margin-right: 16px;
  background-color: var(--bg-color);
  border: solid 2px var(--border-blurry);
  border-radius: var(--bd-radius);
  font-size: 1rem;
  font-weight: bold;
  padding: 8px;
  text-align: center;
  color: white;
}

#right-side label {
  cursor: pointer;
  user-select: none;
}

#change-background::-webkit-file-upload-button {
  background-color: var(--bg-color);
  border: solid 2px var(--border-blurry);
  border-radius: var(--bd-radius);
  color: white;
}

input[type="file"] {
  display: none;
}

header button span {
  display: inline-block;
  line-height: normal;
}

#footer-container {
  display: flex;
  justify-content: center;
}

footer {
  display: flex;
  justify-content: center;
  color: white;
  font-weight: bold;
  text-align: center;
  padding: 8px;
  /* margin in body causes the footer to clip outside the website, following line fixes that */
  margin: 16px;
  border-radius: var(--bd-radius);
  flex-basis: fill;
}

img {
  width: 24px;
  height: 24px;
  vertical-align: middle;
}

::placeholder {
  color: white;
}

a {
  color: white;
}

button {
  font-weight: bold;
  cursor: pointer;
  user-select: none;
}

button:hover,
button:focus,
button:active,
#book-adder:hover,
#book-adder:focus,
#book-adder:active,
#change-bg-wrapper:hover,
#change-bg-wrapper:focus,
#change-bg-wrapper:active {
  -webkit-transform: scale(1.05);
  transform: scale(1.05);
  box-shadow: 0px 0px 4px 0px rgba(0, 0, 0, 0.25);
}