* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
@font-face {
  font-family: "poppins";
  src: url(asset/font/poppins-regular-webfont.woff) format("woff");
}
@font-face {
  font-family: "poppins-medium";
  src: url(asset/font/poppins-medium-webfont.woff) format("woff");
}
body {
  background-image: url(asset/img/trnava-university-sd8uJsf4XM4-unsplash-low.jpg);
  background-position: center;
  background-attachment: fixed;
  background-size: cover;
  background-repeat: no-repeat;
}
body,
input,
button {
  font-family: "poppins";
}

input,
button {
  font-size: 16px;
}

.head_bar {
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgb(159, 100, 237);
  /* color: white; */
}

.head_bar h1 {
  animation: slideText 1s ease-in-out infinite alternate-reverse;
  font-family: "poppins-medium";
}

main {
  max-width: 800px;
  width: 80%;
  margin: 0 auto;
  padding: 16px;
  background-color: rgba(255, 255, 255, 0.886);
}

.input_section {
  display: flex;
  flex-direction: column;
  padding: 16px;
  border: 1px solid black;
  border-radius: 10px;
  /* align-items: center; */
}

.input_section > h2 {
  text-align: center;
  color: cornflowerblue;
  font-family: "poppins-medium";
  height: 2rem;
}

.input_section > form {
  display: flex;
  flex-direction: column;
  width: 100%;
  align-items: center;
}

.input_section > form > .input {
  margin: 8px 0;
  width: 100%;
}

.input_section > form > button {
  position: relative;
  width: 80%;
  height: 55px;
  border-radius: 45px;
  border: none;
  background-color: rgb(151, 95, 255);
  color: white;
  box-shadow: 0px 10px 10px rgb(210, 187, 253) inset,
    0px 5px 10px rgba(5, 5, 5, 0.212), 0px -10px 10px rgb(124, 54, 255) inset;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.Btn::before {
  width: 70%;
  height: 2px;
  position: absolute;
  background-color: rgba(250, 250, 250, 0.678);
  content: "";
  filter: blur(1px);
  top: 7px;
  border-radius: 50%;
}

.Btn::after {
  width: 70%;
  height: 2px;
  position: absolute;
  background-color: rgba(250, 250, 250, 0.137);
  content: "";
  filter: blur(1px);
  bottom: 7px;
  border-radius: 50%;
}

.Btn:hover {
  animation: jello-horizontal 0.9s both;
}

@keyframes jello-horizontal {
  0% {
    transform: scale3d(1, 1, 1);
  }

  30% {
    transform: scale3d(1.25, 0.75, 1);
  }

  40% {
    transform: scale3d(0.75, 1.25, 1);
  }

  50% {
    transform: scale3d(1.15, 0.85, 1);
  }

  65% {
    transform: scale3d(0.95, 1.05, 1);
  }

  75% {
    transform: scale3d(1.05, 0.95, 1);
  }

  100% {
    transform: scale3d(1, 1, 1);
  }
}

.input_section > form > button > span {
  font-weight: bold;
}

.input_section > form > .input > input {
  display: block;
  width: 100%;
  padding: 8px;
  border-radius: 5px;
  border: 2px solid rgb(21, 255, 0);
  outline: none;
}

.input_section > form > .input > input:focus {
  border: 2px solid rgb(209, 3, 255);
  outline: none;
}

.input_section > form > .input > label {
  color: cornflowerblue;
  font-weight: bold;
}

.input_section > form > .input_inline {
  margin: 12px 0;
  display: flex;
  align-items: center;
  display: flex;
  gap: 1rem;
  width: 100%;
}

.input_section > form > .input_inline > label input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

input_section > form > .input_inline > label {
  display: block;
  position: relative;
  cursor: pointer;
  font-size: 20px;
  user-select: none;
}

.checkmark {
  position: relative;
  top: 0;
  left: 0;
  height: 1.4em;
  width: 1.4em;
  border: 2px solid #2196f3;
  border-radius: 1rem 0rem 1rem;
  transform: rotate(45deg);
  transition: all 0.5s ease-in-out;
}

input:checked ~ .checkmark {
  box-shadow: 0px 0px 40px 5px #2196f3;
  border-radius: 1rem 0rem 1rem;
  background-color: #2195f31f;
}

.checkmark:after {
  content: "";
  position: absolute;
  display: none;
}

input:checked ~ .checkmark:after {
  display: block;
}

.checkmark:after {
  left: 0.35em;
  top: 0.2em;
  width: 0.25em;
  height: 0.5em;
  border: solid #2196f3;
  border-width: 0 0.15em 0.15em 0;
  transform: rotate(-5deg);
  animation: upAnimate 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

@keyframes upAnimate {
  from {
    transform: translate(-20px, -20px) rotate(-5deg);
    opacity: 0;
  }

  to {
    transform: translate(0, 0) rotate(-5deg);
    opacity: 1;
  }
}

.search_section {
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  border: 1px solid black;
  border-radius: 10px;
}

.search_section > .h2 {
  color: cornflowerblue;
}

.search_section > form {
  padding: 16px;
  width: 100%;
  display: flex;
}

.search_section > form > label {
  display: flex;
  align-items: center;
  margin-right: 20px;
  font-size: 1.2rem;
  color: #ff0000;
}

.search_section > form > input {
  padding: 5px;
  border-radius: 5px;
  width: 60%;
}

.search_section > form > .find-btn,
a i {
  background-color: cornflowerblue;
  color: white;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  width: auto;
  padding: 0.5rem;
  margin: 0 1rem;
}

.search_section > form > .find-btn:hover {
  background-color: #ff0000;
}

.search_section > form > .find-btn:active {
  background-color: #b205f7;
}

.search_section a i:active {
  background-color: #b205f7;
}

.book_shelf {
  margin: 16px 0 0 0;
  border: 1px solid black;
  padding: 16px;
  border-radius: 10px;
}

.book_shelf > h2 {
  color: cornflowerblue;
}

.book_shelf > .book_list {
  padding: 16px;
  background-image: url(asset/img/circle-scatter-haikei.svg);
  background-attachment: fixed;
  background-position: center;
  background-size: contain;
  background-repeat: no-repeat;
}

.book_shelf > .book_list > .book_item {
  padding: 8px 16px 16px 16px;
  border: 3px solid rgb(153, 91, 253);
  /* border-radius: 5px; */
  margin: 40px 0;
  background-color: #ffffff83;
  border-radius: 32px;
  /* background: #ece4e4; */
  box-shadow: 16px 16px 22px rgba(153, 91, 253, 0.295), -16px -16px 22px #ffffff;
}

.book_shelf > .book_list > .book_item > h3,
.book_item p {
  margin: 1rem 0;
  color: #ff0000;
}

.book_shelf > .book_list > .book_item p {
  color: #000;
}
.action {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  margin-top: 3rem;
}

.green {
  display: block;
  font-family: helvetica;
  color: #000;
  font-size: 16px;
  font-weight: bold;
  box-shadow: 9px 8px 0px -1px#BEE2F9, 9px 8px 0px 1px #000;
  padding: 5px 10px;
  border-radius: 11px;
  border: 2px solid #000;
  background: linear-gradient(to top, #63b8ee, #468ccf);
  transition: 0.3s;
  cursor: pointer;
}

.green:hover {
  transition: 0.3s;
  transform: translate(-0.3em, -0.3em);
  box-shadow: 14px 13px 0px -1px #bee2f9, 14px 13px 0px 1px #000;
  border: 2px solid #000;
}

.green:active {
  transition: 0.3s;
  transform: translate(0.6em, 0.6em);
  box-shadow: 0px 0px 0px -1px #bee2f9, 0px 0px 0px 0.1px#000;
}

.red {
  --b: 3px;
  /* border thickness */
  --s: 0.45em;
  /* size of the corner */
  --color: #b205f7;
  font-weight: bold;
  padding: calc(0.5em + var(--s)) calc(0.9em + var(--s));
  color: var(--color);
  --_p: var(--s);
  background: conic-gradient(
      from 90deg at var(--b) var(--b),
      #0000 90deg,
      var(--color) 0
    )
    var(--_p) var(--_p) / calc(100% - var(--b) - 2 * var(--_p))
    calc(100% - var(--b) - 2 * var(--_p));
  transition: 0.3s linear, color 0s, background-color 0s;
  outline: var(--b) solid #0000;
  outline-offset: 0.6em;
  font-size: 16px;
  border: 0;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.red:hover,
.red:focus-visible {
  --_p: 0px;
  outline-color: #b205f7;
  outline-offset: 0.05em;
}

.red:active {
  background: #b205f7;
  color: #000000;
}

footer {
  width: 100%;
  height: 50px;
  background-color: rgb(159, 100, 237);
  display: flex;
  justify-content: center;
  align-items: center;
}

footer h3 {
  font-size: 1rem;
  color: #ffffff;
}

footer h3 a {
  color: #000;
  text-decoration: none;
}

@keyframes slideText {
  0% {
    color: rgb(255, 0, 0);
  }
  25% {
    color: rgb(255, 0, 251);
  }
  50% {
    color: rgb(30, 0, 255);
  }
  75% {
    color: rgb(127, 255, 148);
  }
  100% {
    color: rgb(255, 255, 240);
  }
}

@media (max-width: 500px) {
  html {
    font-size: 80.5%;
  }
  main {
    width: 90%;
  }
  .input_inline p {
    font-size: 1.2rem;
  }

  .input_section > form > button {
    margin-top: 3rem;
  }

  .search_section form {
    padding: 16px 0;
    justify-content: space-between;
  }
  .search_section form label {
    margin: 0;
    display: none;
  }
  .search_section > form > input {
    width: 70%;
  }
  .search_section > form > .find-btn,
  a i {
    margin: 0;
    padding: 0.7rem;
    font-size: 1rem;
  }
  .book_shelf > .book_list {
    background-attachment: scroll;
    background-size: cover;
  }
}