@import url('https://fonts.googleapis.com/css2?family=Alumni+Sans+SC:ital,wght@0,100..900;1,100..900&display=swap');
:root {
  /* colors */
  --body-bg: #FAFAFA;
  --page-bg: #F5F5F5;
  --dark-text: #2A2935;
  /* spacing */
  /* this is what defines the global scale */
  --baseline: 12px;
  /* fonts */
  --book-title: "Alumni Sans SC", sans-serif;
  --title: "Cormorant Garamond", serif;
  --body: "Cormorant Garamond", serif;
  --base-size: var(--baseline) * 1.2;
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--body-bg);
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
html, body{
  background-image: url(/img/bg_school.jpg);
  background-repeat: repeat;
}

.cover {
  width: calc(var(--baseline) * 62);
  height: calc(var(--baseline) * 45.6);
  box-shadow: 0 0 100px rgba(0, 0, 0, 0.3);
  position: relative;
  text-align: center;
}
.cover .logo{
  margin-top: -85px;
  width: 250px;
  position: absolute;
  top: 0;
  left: 50%;
  margin-left: -125px;
}
.user_login{
  display: none;
}
.book {
  width: 100%;
  height: 100%;
  display: flex;
  perspective: 1200px;
}
.book__page {
  position: relative;
  width: 50%;
  height: 100%;
  display: grid;
  transform: rotateY(0deg);
  transition: transform 0.9s cubic-bezier(0.645, 0.045, 0.355, 1);
  transform-origin: 0% 0%;
  background-color: var(--page-bg);
  background-image: linear-gradient(90deg, #e3e3e3 0%, rgba(247, 247, 247, 0) 18%);
  text-align: center;
}
.book__page:nth-of-type(1) {
  background-image: linear-gradient(-90deg, #e3e3e3 0%, rgba(247, 247, 247, 0) 18%);
}
.book__page--1 {
  cursor: pointer;
  overflow: hidden;
}
.book__page--1 img {
  width: 100%;
  max-width: 100%;
  height: auto;
}
.book__page--2 {
  position: absolute;
  right: 0;
  pointer-events: none;
  transform-style: preserve-3d;
  background-color: var(--page-bg);
  background-image: linear-gradient(90deg, #e3e3e3 0%, rgba(247, 247, 247, 0) 18%);
}
.book__page--4 {
  cursor: pointer;
  padding: 0;
}
.book__page-front {
  position: absolute;
  width: 100%;
  height: 100%;
  transform: rotateY(0deg) translateZ(1px);
}
.book__page-back {
  position: absolute;
  width: 100%;
  height: 100%;
  padding: 0 calc(var(--baseline) * 1.8);
  transform: rotateY(180deg) translateZ(1px);
}
.overlay{
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  background-color: rgba(221, 221, 221, 0.9);
}
.book__page .page__content {
  padding-right: 20px;
  padding-left: 20px;
  height: 100%;
  position: relative;
  text-align: center;

}
.book__page .page__content-book-title {
  font-family: var(--book-title);
  font-size: calc(var(--base-size) * 3);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--dark-text);
  margin-top: 40px;
  margin-bottom: calc(var(--baseline) * 3);
}
.book__page .page__content-author {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 1.2);
  font-weight: 100;
  text-transform: uppercase;
  color: var(--dark-text);
  border-top: 1px solid var(--dark-text);
  border-bottom: 1px solid var(--dark-text);
  display: inline-block;
  padding: calc(var(--baseline) / 2) calc(var(--baseline) / 5);
  margin-bottom: calc(var(--baseline) * 6);
}
.book__page .page__content-credits {
  font-family: var(--title);
  line-height: 18px;
  font-size: 14px;;
  margin-bottom: calc(var(--baseline) * 2);
  letter-spacing: 1px;

}
.book__page .page__content-credits span {
  display: block;
  font-size: calc(var(--base-size) * 1.2);
  letter-spacing: 0;
}
.book__page .page__content-copyright {
  position: absolute;
  width: calc(100% - (var(--baseline) * 2));
  bottom: calc(var(--baseline) * 2);
  font-family: var(--title);
  font-size: calc(var(--base-size) * 0.8);
  text-transform: uppercase;
}
.book__page .page__content-title {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 1);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: calc(var(--baseline) * 5);
  margin-bottom: calc(var(--baseline) * 3);
}
.book__page .page__content-table {
  width: 100%;
  margin-top: calc(var(--baseline) * 2);
}
.book__page .page__content-table td {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 1);
  padding-bottom: calc(var(--baseline) * 1.5);
  text-transform: uppercase;
}
.book__page .page__content-blockquote {
  margin-bottom: calc(var(--baseline) * 2);
}
.book__page .page__content-blockquote-text {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 0.67);
  font-style: italic;
  text-align: justify;
}
.book__page .page__content-blockquote-reference {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 0.7);
  margin-top: calc(var(--baseline) * 0.3);
  float: right;
  text-transform: uppercase;
}
.book__page .page__content-text {
  font-family: var(--title);
  font-size: calc(var(--base-size) * 0.67);
  text-align: justify;
  text-indent: var(--baseline);
}
.book__page .page__number {
  position: absolute;
  bottom: var(--baseline);
  width: calc(100% - (var(--baseline) * 2));
  font-family: var(--title);
  font-size: calc(var(--base-size) * 0.67);
  text-align: center;
}
.book input[type=radio] {
  display: none;
}

.book input[type=radio]:checked + .book__page {
  transition: transform 0.9s cubic-bezier(0.645, 0.045, 0.355, 1);
  transform: rotateY(-180deg);
}
 .register_form{
   display: none;
}
.book input[type=radio]:checked + .book__page .login_form{
  display: block;
}
form label{
  text-align: left;
  margin-bottom: 10px;
  font-weight: bold;
  font-size: 17px;
}
.form-group{
  padding: 0px 20px 20px 20px;
}
.register_form .form-group{
  padding: 0px 0px 15px 10px;
}
div.login{
  text-align: center;
  margin-top: 0px;
}
form input, form select{
  width: 100%;
  padding: 10px 8px;
  font-size: 16px;
  border-radius: 5px;
  border: 1px solid #DDD;
  outline-style: none;
  box-shadow: none;
  background-color: #FFF;
}
form input:focus, form input:active, form select:focus, form select:active{
  border: 1px solid #c8c2e9;
}
form label{
  display: block;
  text-align: left;
}
.register_btn, .login_btn{
  padding: 10px 20px;
  border: 1px solid #c8c2e9;
  border-radius: 8px;
  padding-right: 35px;
  position: relative;
  text-decoration: none;
  color: #000;
  cursor: pointer;
}
.register_btn img, .login_btn img{
  position: absolute;
  right: 5px;
  top: 5px;
  width: 24px;
}
.login_btn{
  padding: 10px 20px;
  padding-left: 35px;
}
.login_btn img{
  position: absolute;
  right: auto;
  left: 5px;
  top: 5px;
  width: 24px;
}
.input-group {
  display: flex;
  gap: 1rem; /* elementlər arasında boşluq istəyirsinizsə */
}

.input-group > div {
  flex: 1; /* Bütün uşaqlar bərabər sahə alacaq */
}
.alert-danger {
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
  border-radius: 0.375rem;
  background-color: #f8d7da;
  color: #721c24;
  border-color: #f5c6cb;
  font-size: 15px;
}
.alert-danger .close {
    float: right;
    font-weight: bold;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    color: #721c24;
  }