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

* {
  margin: 0;
}

body {
	line-height: 1.5;
	background: #323333;
	font: 14px 'Open Sans', sans-serif;
}

.site-header, .site-content, .site-footer {
	max-width: 1034px;
	width: 100%;
	background: #fff;
	margin: 0 auto;
	padding-left: 20px;
	padding-right: 20px;
}

.site-header {
	display: flex;
	padding: 15px 20px;
}

.logo-name {
	text-decoration: none;
	color: #333;
	font-size: 2rem;
	font-weight: 800;
	text-transform:  uppercase;
}

.ai {
	color: red;
}

h1 {
	font-size: 2rem;
	padding: 15px 0 15px 0;
}

h2 {
	font-size: 1.7rem;
	padding-bottom: 20px;
}

h3 {
	font-size: 1.5rem;
	padding-bottom: 5px;
}

h3>a {
	text-decoration: none;
	color: #3498DB;
}

h4 {
	font-size: 1.5rem;
	padding-bottom: 15px;
}

p {
	padding: 0px 0 20px 0;
}

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

p {
	font: 1.2em 'Open Sans', sans-serif;
}

section {
	max-width: 1034px;
	width: 100%;
	background: #fff;
	margin: 0 auto;
	padding: 50px 20px;
}

section a {
	text-decoration: none;
	color: #3498DB;
}

.up-btn {
	display: none;
	position: fixed;
	background-color: #3498DB;
	right: 20px;
	bottom: 20px;
	border-radius: 22px;
	cursor: pointer;
	width: 44px;
	height: 44px;
}

.up-btn::before {
	content: "";
	text-align: center;
	position: absolute;
	width: 20px;
	height: 20px;
	left: 12px;
	top: 12px;
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20'%3E%3Cg fill='none' stroke='%23fff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M10 17V4M3 10l7-7 7 7'/%3E%3C/g%3E%3C/svg%3E");
}

.site-footer {
	text-align: center;

}

.site-footer a {
	text-decoration: none;
	color: #111;
}

.site-footer a:hover, section a:hover, h3>a:hover {
	color: #E74C3C;
}


/*********************hamburger**********************/

.logo {
	display: block;
	width: 100%;
}

.hamburger-menu {
	display: block;
}

#menu__toggle {
  opacity: 0;
  display: none
}

.menu__btn {
  display: flex;
  align-items: center;
  position: sticky;
  top: 25px;
  width: 26px;
  height: 26px;
  cursor: pointer;
  z-index: 1;
}

.menu__btn > span,
.menu__btn > span::before,
.menu__btn > span::after {
  display: block;
  position: absolute;
  width: 100%;
  height: 2px;
  background-color: #616161;
}
.menu__btn > span::before {
  content: '';
  top: -8px;
}
.menu__btn > span::after {
  content: '';
  top: 8px;
}

.menu__box {
  display: block;
  position: fixed;
  visibility: hidden;
  top: 0;
  left: -100%;
  width: 300px;
  height: 100%;
  margin: 0;
  padding: 80px 0;
  list-style: none;
  text-align: center;
  background-color: #fff;
  box-shadow: 1px 0px 6px rgba(0, 0, 0, .2);
}

.menu__item {
  display: block;
  padding: 12px 24px;
  color: #333;
  font-family: 'Roboto', sans-serif;
  font-size: 20px;
  font-weight: 600;
  text-decoration: none;
}
.menu__item:hover {
  background-color: #CFD8DC;
}

#menu__toggle:checked ~ .menu__btn > span {
  transform: rotate(45deg);
}
#menu__toggle:checked ~ .menu__btn > span::before {
  top: 0;
  transform: rotate(0);
}
#menu__toggle:checked ~ .menu__btn > span::after {
  top: 0;
  transform: rotate(90deg);
}
#menu__toggle:checked ~ .menu__box {
  visibility: visible;
  left: 0;
}