@font-face {
  font-family: "Nanum Gothic";
  src: url(./fonts/Nanum_Gothic/NanumGothic-Regular.ttf) format('truetype');
  font-weight: normal;
}

@keyframes expand {
  from {
    scale: 0;
  }

  to {
    scale: 1;
  }
}

:root {
  --primary-color: #475569;
  --secondary-color: #e2e8f0;
  --accent-color: #f8fafc;
  --btn-hover-color: #f1f5f9;
  --starred-color: #eab308;
  --to-read-color: #fafafa;
  --checked-color: #22c55e;
  --trash-color: #ef4444;
  --font-l: 3.5rem;
  --font-m: 2.5rem;
  --font-s: 1.5rem;
  --transition-duration: 0.3s;
  --section-padding: 30px;
  --close-btn-offset: 15px;
  --form-control-offset: 25px;
  --book-width: 200px;
  --book-border-radius: 5px;
  --book-box-shadow: 0 0 10px 5px rgba(0, 0, 0, 0.1);
}

body {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: 1fr auto;
  max-height: 100vh;
  background-color: var(--accent-color);

  & * {
    font-family: "Nanum Gothic", sans-serif;
  }
}

/* Nav */

.menu-btn {
  margin: var(--section-padding);
  visibility: hidden;
  grid-area: 1 / 1 / 2 / 3;

  .action-icon > path {
    fill: var(--accent-color);
  }
}

nav {
  grid-area: 1 / 1 / 2 / 2;
  background-color: var(--secondary-color);
  padding: var(--section-padding);
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  flex-shrink: 1;
  z-index: 2;

  & * {
    color: var(--primary-color);
  }

  & hr {
    width: 100%;
    border: none;
    border-top: 2px solid var(--primary-color);
    margin-block: var(--section-padding);
  }

  & .btn {
    margin-bottom: var(--section-padding);
  }
}

.nav-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;

  & .logo {
    width: 30px;
    aspect-ratio: 1/1;
    fill: var(--primary-color);
  }

  & .title {
    font-size: var(--font-l);
    color: var(--primary-color);
  }
}

.btn,
select {
  font-size: var(--font-s);
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  white-space: nowrap;
  cursor: pointer;
  padding: 5px;
  background-color: var(--primary-color);
  color: var(--accent-color);
  border: 2px solid var(--primary-color);
  border-radius: 5px;
  outline: none;
  transition: background, color;
  transition-duration: var(--transition-duration);
  width: fit-content;
  height: 35px;
}

option {
  background-color: var(--accent-color);
}

.add-icon {
  width: var(--font-s);
  aspect-ratio: 1/1;

  path {
    fill: var(--accent-color);
  }
}

.btn,
select {

  &:hover,
  &:focus-visible {
    background: var(--accent-color);
    color: var(--primary-color);

    svg > path {
      fill: var(--primary-color);
    }
  }
}

/* Main */

main {
  background-color: var(--accent-color);
  grid-area: 1 / 2 / 2 / 3;
  display: flex;
  min-height: 0;
  flex-grow: 1;
  flex-shrink: 1.5;
}

section.library {
  width: 100%;
  padding: var(--section-padding) calc(var(--section-padding) * 2.5);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(var(--book-width), 1fr));
  place-items: center;
  gap: 60px;
  overflow-y: auto;
}

/* Book */

.book {
  position: relative;
  border-radius: var(--book-border-radius) 0 0 var(--book-border-radius);
  border: none;
  outline: none;
  transition-property: scale, box-shadow;
  transition-duration: 0.4s;

  &:hover,
  &:focus-visible,
  &:has(.action-btn:focus-visible) {
    scale: 1.1;
    box-shadow: var(--book-box-shadow);
  }
}

.book-cover {
  aspect-ratio: 1/1.414;
  width: var(--book-width);
  height: 100%;
  background-size: cover;
  background-position: center;
  padding: 15px;
  border-radius: var(--book-border-radius) 0 0 var(--book-border-radius);
  background-color: lightblue;
  position: relative;
  z-index: 1;
}

.book-meta {
  display: flex;
  flex-direction: column;
  gap: 15px;
  height: 100%;

  & * {
    text-align: start;
  }

  & .title {
    font-size: var(--font-m);
  }

  & .author,
  & .page {
    font-size: var(--font-s);
    font-weight: bold;
  }

  &.hidden {
    visibility: hidden;
  }
}

.action-bar {
  position: absolute;
  bottom: 0;
  right: 0;
  background-color: var(--secondary-color);
  border-radius: 0 var(--book-border-radius) var(--book-border-radius) 0;
  display: flex;
  flex-direction: column;
  transform: translateX(0);
  transition-property: transform, box-shadow;
  transition-duration: var(--transition-duration);

  & > .action-btn:nth-of-type(1) {
    border-top-right-radius: var(--book-border-radius);
  }

  & > .action-btn:last-of-type {
    border-bottom-right-radius: var(--book-border-radius);
  }
}

.book:hover > .action-bar,
.book:focus-visible > .action-bar,
.action-bar:has(.action-btn:focus-visible) {
  box-shadow: var(--book-box-shadow);
  transform: translateX(100%);
}

.action-btn {
  cursor: pointer;
  background-color: transparent;
  border: none;
  display: flex;
  padding: 10px;
  outline: none;
  transition: background-color var(--transition-duration);

  &:hover,
  &:focus-visible {
    background-color: var(--primary-color);
  }

  & > .action-icon > path {
    transition: fill var(--transition-duration);
  }
}

.star-btn[data-active="true"] {
  & > .action-icon > path {
    fill: var(--starred-color);
  }
}

.to-read-btn[data-active="true"] {
  & > .action-icon > path {
    fill: var(--to-read-color);
  }
}

.check-btn[data-active="true"] {
  & > .action-icon > path {
    fill: var(--checked-color);
  }
}

.trash-btn:hover,
.trash-btn:focus-visible {
  & > .action-icon > path {
    fill: var(--trash-color);
  }
}

.action-icon {
  width: 20px;
  aspect-ratio: 1/1;
}

/* Dialog */

dialog {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: none;
  border-radius: 10px;
  background-color: var(--secondary-color);
  padding: calc(var(--close-btn-offset) + var(--section-padding));
  animation: expand var(--transition-duration);
  transform-origin: 0% 0%;
  width: 100%;
  max-width: 350px;
  margin-inline: 15px;

  & * {
    color: var(--primary-color);
    font-size: var(--font-s);
  }

  &::backdrop {
    background-color: rgba(0, 0, 0, 0.3);
  }
}

.close-btn {
  cursor: pointer;
  background-color: transparent;
  border: none;
  align-self: flex-end;
  margin: var(--close-btn-offset);
  display: flex;
  position: absolute;
  top: 0;
  right: 0;
}

.close-icon {
  width: 30px;
  aspect-ratio: 1/1;

  path {
    fill: var(--primary-color);
  }
}

/* Form */

form {
  display: flex;
  flex-direction: column;
  align-items: center;
}

fieldset {
  border: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
}

legend {
  font-size: var(--font-m);
  font-weight: bold;
  text-align: center;
  margin-bottom: var(--form-control-offset);
}

.form-control {
  display: flex;
  flex-direction: column;
  gap: 5px;
  align-items: flex-start;
}

label {
  align-self: flex-start;
  font-weight: bold;
}

input {
  border: 1px solid var(--primary-color);
  border-radius: 2px;
  font-size: var(--font-s);
  padding: 5px;
  width: 100%;

  &[type="checkbox"] {
    opacity: 0;
    position: absolute;
    width: 0;

    & + label {
      display: flex;
      align-items: center;
      gap: 10px;
      white-space: nowrap;

      &::before {
        content: "\2714";
        --checkbox-size: 15px;
        width: var(--checkbox-size);
        height: var(--checkbox-size);
        font-size: calc(var(--checkbox-size) * 0.75);
        background-color: var(--accent-color);
        color: transparent;
        border: 1px solid var(--primary-color);
        border-radius: 2px;
        transition: background-color, color;
        transition-duration: var(--transition-duration);
        text-align: center;
        cursor: pointer;
      }
    }

    &:focus-visible + label::before {
      outline: 1px solid black;
    }

    &:checked + label::before {
      background-color: var(--primary-color);
      color: var(--accent-color);
    }
  }
}

form > .btn {
  margin-top: var(--form-control-offset);
  width: 75px;
}

/* Footer */

footer {
  grid-area: 2 / 1 / 3 / 3;
}

/* Overlay */

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgb(0, 0, 0);
  opacity: 0;
  transition: opacity var(--transition-duration);
  z-index: -1;
}

@media (max-width: 768px) {
  :root {
    --book-width: 150px;
  }

  body {
    grid-template-rows: auto 1fr auto;
  }

  h1.title {
    display: none;
  }

  .menu-btn {
    visibility: visible;
  }

  nav {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform, visibility;
    transition-duration: var(--transition-duration);

    &.open {
      transform: translateX(0);
      visibility: visible;
    }
  }

  main {
    grid-area: 2 / 1 / 3 / 3;
  }

  footer {
    grid-area: 3 / 1 / 4 / 3;
  }

  body:has(nav.open) .overlay {
    display: block;
    opacity: 0.5;
    z-index: 1;
  }
}