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

:root {
  --font-color: #00303F;
  --light-font-color: #1a4552;
  --button-color: #66838c;
  --button-color-hover: #b3c1c6;
  --book-card-color: #F5F4F4;
  --status-label-read-color: #C3A37B;
  --status-label-unread-color: #E4D1BA;
  --sub-btn-color: #CAE4DB;
  --entry-form-bg-color: #4d6e79;
}

/* poppins-regular - latin */
@font-face {
  font-display: swap; 
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 400;
  src: url('assets/fonts/poppins-v20-latin-regular.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}
/* poppins-700 - latin */
@font-face {
  font-display: swap; 
  font-family: 'Poppins';
  font-style: normal;
  font-weight: 700;
  src: url('assets/fonts/poppins-v20-latin-700.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}

/* fraunces-800 - latin */
@font-face {
  font-display: swap; 
  font-family: 'Fraunces';
  font-style: normal;
  font-weight: 800;
  src: url('assets/fonts/fraunces-v31-latin-800.woff2') format('woff2'); /* Chrome 36+, Opera 23+, Firefox 39+, Safari 12+, iOS 10+ */
}

body, button {
  font-family: 'Poppins', sans-serif;
  font-weight: 400;
  color: var(--font-color, black);
}  

h1 {
  font-family: 'Fraunces', serif; 
  font-size: clamp(2rem, 0.0097vw + 1.772rem, 3rem); 
}

h2 {
  font-size: clamp(1.625rem, 0.0061vw + 1.542375rem, 2.25rem);
}

h3 {
  font-size: clamp(1.375rem, 0.0036vw + 1.352rem, 1.75rem);
}

label {
  font-weight: 700;
  letter-spacing: 1px; 
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid; 
  grid-template-rows: auto 1fr auto;  
}

.header {
  grid-row: 1 / 2;
  padding: 1rem 0;
  display: flex; 
  flex-direction: column;
  justify-content: center; 
  align-items: center; 
 
  position: sticky;
  top: 0;
  align-self: start;  
  background-color: white; 
  box-shadow: 0 4px 2px -2px rgb(122, 122, 122, 0.2);
}

#form-popup {
  display: none; 
  
  position: fixed; 
  z-index: 10; 
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  background-color: rgb(255, 255, 255, 0.7);
  overflow: auto; 
}

#entry-form {
  width: 25rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(7, auto);
  gap: 1rem; 
  grid-template-areas:
    "... ... ... cancel"
    "... heading heading ..."
    "title title title title"
    "author author author author"
    "pages pages ... ..."
    "status status ... ..."
    "... submit submit ...";
  
  margin: 2.75rem auto; 
  padding: 2.25rem; 
  background-color: var(--entry-form-bg-color, rgb(0, 0, 0, 0.7)); 
  color: white;
  border-radius: 25px; 
}

#cancel {
  grid-area: cancel;  
  justify-self: end;
  border: none;
  border-radius: 50%;
  background-color: var(--entry-form-bg-color, rgb(0, 0, 0, 0.7));
  width: 2.5rem; 
  height: 2.5rem; 
}

#cancel img {
  width: 100%;
  height: auto;
  vertical-align: middle; 
}

#entry-form h2 {
  grid-area: heading;
  font-weight: 700;
  text-align: center;
}

#entry-form > div {
  display: flex;
  flex-direction: column;
  justify-content: start;
}

.title-input {
  grid-area: title; 
}

.author-input {
  grid-area: author; 
}

.pages-input {
  grid-area: pages; 
}

.status-input {
  grid-area: status; 
}

input {
  font-size: 1.25rem;
  border-radius: 10px;
  border: none;
  margin-top: 0.5rem; 
  padding: 0.5rem 1rem; 
}

input[type="checkbox"] {
  position: relative;
  appearance: none; 
  width: 3rem; 
  height: 3rem; 
  background-color: white; 
}

input[type="checkbox"]::before {
  content: "✔";
  position: absolute;
  font-size: 1.25em;
  right: 0.8rem;
  top: 0.3rem;
  visibility: hidden;
}

input[type="checkbox"]:checked::before {
  visibility: visible;
}

input[type="text"]:focus {
  outline: 5px solid var(--font-color, black); 
}

input[type="checkbox"]:hover {
  outline: 5px solid var(--font-color, black);
  cursor: pointer;  
}

input[type="submit"] {
  grid-area: submit; 
  border-radius: 50px;
  border: none;
  padding: 0.75rem; 
  font-weight: 700;
  background-color: var(--sub-btn-color, lightgray);
  color: var(--font-color, black);
  width: 60%;
  justify-self: center;
}

input[type="submit"]:hover {
  background-color: var(--font-color, black);
  color: white; 
  cursor: pointer; 
}

#open-form {
  background-color: var(--button-color, gray);
  font-size: 1.25rem; 
  color: white;
  margin-top: 1rem; 
  border-radius: 50px;
  padding: 0.5rem 1rem; 
  border: none;
  font-weight: 700;
}

#open-form:hover {
  background-color: var(--font-color, black);
  cursor: pointer;
}

.container {
  grid-row: 2 / 3;
  margin: 2.5rem 5rem; 
  display: grid; 
  grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  grid-auto-rows: 22rem; 
  gap: 2rem; 
}

.book-card {
  padding: 0 1.25rem 1rem 1.25rem; 
  display: flex; 
  flex-direction: column;
  align-items: center;
  justify-content: space-between; 
  gap: 0.5rem; 
  background-color: var(--book-card-color, whitesmoke);
  border-radius: 10px; 
  box-shadow: 0px 0px 3px 0px rgb(122, 122, 122, 0.8); 
}

.delete-btn {
  background-color: var(--sub-btn-color, lightgray);
  margin-top: 1rem; 
  padding: 0.5rem;
  border: none; 
  border-radius: 50px;
}

.delete-btn:hover {
  background-color: var(--button-color, gray);
  color: white;
  cursor: pointer;
}

.delete-btn:active, 
#open-form:active, 
input[type="submit"]:active {
  transform: scale(0.95);
}

.status-label {
  border: none;
  padding: 0;
  margin: 0;
  background: transparent;
  cursor: pointer;
  font-size: 1.25rem; 
  width: 100%;
  text-align: center;
}


.read {
  background-color: var(--status-label-read-color, darkgoldenrod);
  color: #3d3427;
}

.unread {
  background-color: var(--status-label-unread-color, burlywood);
  color: #675641;
}

.book-title, 
.book-author {
  max-width: 100%; 
  text-transform: capitalize;
}
.book-title {
  color: var(--light-font-color, darkgray);
  font-weight: 700;
  text-align: center; 
  word-wrap: break-word;
  overflow: auto; 
}

.book-author {
  text-decoration: underline;
  text-align: center; 
  overflow: auto;
}

.credit, 
.credit a {
  grid-row: 3 / 4;
  text-align: center;
  color: var(--font-color, black);
  opacity: 80%;
}