html {
    box-sizing: border-box;
}

*,
*::before,
*::after {
    box-sizing: inherit;
}

body {
  font-family: 'Lato', sans-serif;
  background-color: #fff;
  font-size: 18px;
  line-height: 29px;
  font-weight: normal;
  font-style: normal;
}

.container {
  max-width: 1210px;
  width: 100%;
  padding: 0 20px;
  margin: 0 auto;
}

.menu {
  /* position: fixed; */
  width: 100%;
  background-color: #fff;
  left: 0;
  top: 0;
  padding: 20px 0 15px;
  z-index: 1;
}

.menu_inner,
.menu,
.menu_list {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.menu_item:not(:last-child) {
  margin-right: 20px;
}

.dropdown {
    float: left;
    overflow: hidden;
}

.dropdown .dropbtn {   
    border: none;
    outline: none;
    background-color: inherit;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    float: none;
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.menu_link,
.dropbtn {
  font-weight: 600;
  font-size: 15px;
  line-height: 20px;
  text-decoration: none;
  color: #000;
}

.menu_link:hover,
.footer__link:hover,
.navbar a:hover, .dropdown:hover .dropbtn  {
  color: #08ae8f;
}

.menu_link--active {
  color: #08ae8f;
  font-weight: 800;
}

.top {
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
  height: 400px;
  position: relative;
}

.top::before {
  content: "";
  position: absolute;
  background-color: #00000080;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
}

.top__inner {
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.top__title,
.top__text {
  z-index: 2;
}

.top__title {
  margin-top: 170px;
  font-size: 45px;
  line-height: 55px;
}

.about {
  padding-top: 60px;
}

.title {
  font-weight: 700;
  font-size: 30px;
  line-height: 50px;
  margin-bottom: 20px;
  color: #444;
  padding-top: 40px;
}

.about__text {
  text-align: justify;
}

.about__text p:not(:last-child) {
  margin-bottom: 30px;
}

.material {
  padding: 40px;
}

.material_list {
  display: flex;
  justify-content: space-between;
}

.material_item {
  text-align: center;
  position: relative;
  background-color: #f6f6f8;
  max-width: 280px;
  width: 100%;
  border: 1px solid #dbdbed;
  padding: 150px 10px 50px;
  line-height: 23px;
}

.material_item:not(:last-child) {
  margin-right: 20px;
}

.material_item::before {
  content: "";
  position: absolute;
  height: 80px;
  width: 100px;
  left: 0;
  right: 0;
  margin: 0 auto;
  top: 50px;
  background-repeat: no-repeat;
  background-position: center center;
  background-size: contain;
}

.material_item--lectures::before {
  background-image: url('../images/icons/lectures.png');
}

.material_item--laboratory::before {
  background-image: url('../images/icons/laboratory.png');
}

.material_item--seminars::before {
  background-image: url('../images/icons/seminars.png');
}

.material_item--practical::before {
  background-image: url('../images/icons/practical.png');
}

.material_item--independent::before {
  background-image: url('../images/icons/independent.png');
}

.material_num {
  display: block;
  padding-top: 10px;
  font-weight: 600;
  font-size: 35px;
  line-height: 40px;
}

.material_link {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 17px;
  background-color: #08ae8f;;
  font-weight: 600;
  font-size: 14px;
  line-height: 14px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: all 0.3s;
}

.material_item:hover 
.material_link {
  opacity: 1;
}

.category {
  background-color: #ecf0f1;
  padding: 50px 0 50px 0;
}

.card__menu {
counter-reset: li; 
list-style: none; 
padding: 0;
text-shadow: 0 1px 0 rgba(255,255,255,.5);
}

.card__link {
position: relative;
display: block;
padding: 25px 35px;
margin: .5em 0;
background: #fff;
color: #444;
text-decoration: none;
border-radius: .3em;
transition: .3s ease-out;
}

.card__link:hover {
  background: #b7ece8;
}

.card__link:hover:before {
  transform: rotate(360deg);
}

.card__link:before {
content: counter(li);
counter-increment: li;
position: absolute;
left: -1.3em;
top: 50%;
margin-top: -1.3em;
background: #8FD4C1;
height: 50px;
width: 50px;
line-height: 2em;
border: .3em solid #8FD4C1;
font-weight: bold;
border-radius: 2em;
transition: all .3s ease-out;
display: flex;
justify-content: center;
align-items: center;
}

.section {
  padding: 40px 0;
}

.section__inner {
  display: flex;
  justify-content: space-around;
}

.author {
  background-color: #ecf0f1;
}

.author__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.author__text {
  font-size: 21px;
  padding-bottom: 40px;
}

.subtitle {
  font-weight: 800;
  font-size: 20px;
  color: #08ae8f;
  text-align: center;
}

.author__topic{
  text-align: center;
  margin-bottom: 40px;
}

.author__subtitle {
  text-align: center;
}

.author__title {
  color: #08ae8f;
  font-weight: 700;
}


.footer {
	background-color: #304054;
	padding: 70px 0 70px;
	color: #fff;
  font-size: 17px;
  line-height: 25px;
}

.footer__inner {
	display: flex;
	justify-content: space-between;
}

.footer__logo {
	width: 263px;
}

.footer__logo {
	margin-bottom: 30px;
}

.footer__text,
.address {
	padding-bottom: 30px;
  max-width: 290px;
}

.footer__title {
	font-size: 20px;
	margin-bottom: 30px;
  font-weight: 550;
  color: #08ae8f;
}

.footer__link {
  text-decoration: none;
  color: #fff;
  font-weight: 550;
}

.contact__item {
  display: block;
}

.phone,
.email {
  text-decoration: none;
  color: #fff;
}