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

:root {
  font-size: 62.5%;
}

body {
  font-family: 'Dosis', sans-serif;
  font-size: 2rem;
  background-color: #e9ecef;
  color: #222;
}

/* HEADER */

.header {
  padding: 3rem;
  display: flex;
  justify-content: space-around;
  align-items: center;
  box-shadow: 1px 3px 5px rgba(0,0,0,0.2);
}

.title {
  margin: 0;
  font-size: 8rem;
  font-weight: 300;
  letter-spacing: 3px;
}

.stats {
  flex-basis: 20%;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}


/* MAIN CONTAINER */

.container {
  max-width: 1500px;
  margin: 0 auto;

}

/* ADD BUTTON CONTAINER */
.control-buttons {
  padding: 4rem;
  display: flex;
  justify-content: center;
  gap: 4rem;
}


.button {
  border:none;
  background-color: #6E7173;
  color: #f8f9fa;
  padding: 1rem 3rem;
  border-radius: 5px;
  cursor: pointer;
  width: 175px;
}

.button-completed {
  background-color: transparent;
  color: #77dd66;
  border: 1px solid #77dd66;
}

.button-add {
  background-color: #77dd66;
}

.button-unread {
  background-color: transparent;
  color: #fd706b;
  border: 1px solid #fd706b;
}

.remove-button {
  background-color: #6E7173;
}

.remove-all-button {
  background-color: #e54c38;
}

.button:hover {
  background-color: #939799;
}

.button-add:hover {
   background-color: #70ce5f;
}

.remove-all-button:hover {
  background-color: #fd706b;
}

.button-completed:hover {
  color: #f8f9fa;
  background-color: #77dd66;
}

.button-unread:hover {
  background-color: #fd706b;
  color: #f8f9fa;
}



/* BOOK CONTAINER */

.book-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  grid-auto-rows: 1fr;
  gap: 2rem;
  padding: 0 3rem;
}

.book-container p:first-child {
  font-size: 3rem;
  font-weight: 400;
}

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  text-align: center;
  background-color: #f8f9fa;
  box-shadow: 0px 3px 5px rgba(0,0,0,0.2);
  padding: 2rem;
  border-radius: 20px;
}

/* FORM */
.modal {
  position: absolute;
  top: 30%;
  left: 35%;

  width: 30%;
  margin: 0 auto;
  background-color: white;
  border-radius: 10px;
  padding: 3rem;
  z-index: 10;
  opacity: 0;
  transform: scale(0);
  transition: opacity 400ms, transform 400ms;
}
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.4);
  backdrop-filter: blur(3px);
  z-index: 5;
  opacity: 0;
  transition: opacity 400ms;
}
.close-modal {
  position: absolute;
  top: 1.2rem;
  right: 3rem;
  font-size: 5rem;
  color: #6E7173;
  cursor: pointer;
  border: none;
  background: none;
}
.form {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.input-control {
  display: flex;
  flex-direction: column;
}

.checkbox {
  flex-direction: row;
  align-items: center;
  gap : 1rem;
}

#submit {
  align-self: center;
}

.hidden {
  visibility: hidden;
}

.shown {
  opacity: 1;
}

.popup {
  transform: scale(1);
}

.invisible {
  display: none;
}