:root {
  --bg-color: #F4F1EA;
  --bk-surface: #FFFEFB;
  --text-color: #252724;
  --accent-color: #304D42;
  --muted-text-color: #F4F1EA;
  --border-color: #dcd7cc;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2rem;
  color: var(--text-color);
  min-height: 100vh;
  background: var(--bg-color);
  font-family: Arial, sans-serif;
}

main {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 15px;
}

button {
  background-color: var(--accent-color);
  color: var(--muted-text-color);
  border-radius: 10px;
  padding: 10px 20px;
  border: none;
}             

button:hover {
  background-color: #669482;
  color: black;
}

button:focus {
  background-color: #669482;
  color: black;
}

#bookshelf {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.book {
  position: relative;
  isolation: isolate;
  color: var(--bk-surface);
  transition: transform 0.2s ease,
              box-shadow 0.2s ease;
  display:flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  aspect-ratio: 2/3;
  background-size: cover;
  background-position: center;
}

.book::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(15,20,18,0.3), rgba(15, 20, 18, 0.1) 40%, rgba(15, 20, 18, 0.4)
  );
  opacity: 0;
  transition: opacity 0.25s ease;
}

.book > h2 {
  position: relative;
  z-index: 1;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease,
              transform 0.25s ease;
  padding: 1rem;
  text-align: center;
}

.book:hover {
  transform: translateX(-5px) translateY(-5px);
  box-shadow: 4px 4px 6px rgba(73, 73, 73, 0.7);
}

.book:hover::before,
.book:focus::before,
.book:focus-within::before {
  opacity: 1;
}

.book:hover > h2,
.book:hover > .book-details,
.book:focus > h2,
.book:focus > .book-details,
.book:focus-within > h2,
.book:focus-within > .book-details {
  opacity: 1;
  transform: translateY(0);
}

.book:hover > .book-details,
.book:focus > .book-details,
.book:focus-within > .book-details {
  pointer-events: auto;
}

.book-details {
  position: relative;
  z-index: 1;  
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease,
              transform 0.25s ease;
  display: flex;
  flex-direction: column;
  padding: 1rem;
  text-align: center;
}

.buttons {
  display: flex;
  gap: 5px;
  justify-content: center;
}

#dialog {
  width: min(700px, calc(100% - 2rem));
  max-height: calc(100dvh - 2rem);
  margin:auto;
  padding: 0;
  overflow: auto;
  color: var(--text-color);
  background-color: var(--bk-surface);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  box-shadow: 0 20px 60px rgba(20,25,22,0.3);
}

#dialog::backdrop {
  background-color: rgba(20,25,22,0.55);
  backdrop-filter: blur(4px);
}

#form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding:2rem;
}

.dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--accent-color);
}

.dialog-header h2 {
  color: var(--accent-color);
  font-family: Georgia, 'Times New Roman', Times, serif;
}

#close-dialog {
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  color: var(--text-color);
  background: transparent;
  border-radius: 50%;
  font-size: 1.5rem;
  line-height: 1;
}

#close-dialog:hover {
  color: var(--bk-surface);
  background-color: var(--accent-color);
}

.form-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-field label,
.checkbox-field label {
  font-size: 0.9rem;
  font-weight: 600;
}

.form-field input,
.form-field textarea {
  width: 100%;
  padding: 0.75rem;
  color: var(--text-color);
  background-color: white;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font: inherit;
}

.form-field textarea {
  min-height: 110px;
  resize: vertical;
}

.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--accent-color);
  outline: 2px solid rgba(48, 77, 66, 0.2);
}

.checkbox-field {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.checkbox-field input {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent-color);
}

.form-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

#cancel {
  color: var(--accent-color);
  background-color: transparent;
  border: 1px solid var(--accent-color);
}

#cancel:hover {
  color: var(--bk-surface);
  background-color: var(--accent-color);
}

@media (max-width: 650px) {
  #form {
    padding: 1.25rem;
  }

  .form-fields {
    grid-template-columns: 1fr;
  }

  .form-buttons button {
    flex: 1;
  }
}