styles.css

/* {
  	border: dashed 1px red;
} */

#menu__toggle {
	display: none;
}

.menu__btn {
	display: none;
}

.wrapper {
	width: 80%;
	margin: auto;
}

.header {
	padding: 37px 0;
	display: flex;
	justify-content: space-between;
	margin-bottom: 134px;
}

.menu {
	display: flex;
	align-items: center;
}

/*выстроил позицию элементов меню, шапки*/

.logo {
	position: relative;
	padding-left: 41px;
	font-family: pt_serifbold,Arial,Helvitica,sans-serif;
	font-size: 24px;
	font-weight: bold;
	line-height: 21px;
	width: 58px;
	height: 28px;
	cursor: pointer;
	/* border: dashed 1px red; */
	/*background: url('img/logo.svg'); */
}
.logo__circle {
	width: 28px;
	height: 28px;
	position: absolute;
	left: 0;
	top: 50%;
	transform: translateY(-69%);
	border-radius: 50%;
	opacity: 0.7;
	/* border: dashed 1px red; */
}
.logo__circle_color_dark-blue {
	background: #0056EC;
}

.logo__circle_color_blue {
	left: 7px;
	top: 22px;
	background: #C8DBFB;
}


.menu__item {
	margin-right: 24px;
	/*border: dashed 1px red;*/
}

.menu__item:last-child {
	margin-right: 5px;
}

.menu__item {
	font: 500 18px roboto,arial,helvetica,sans-serif;
	position: relative;
	padding-bottom: 3px;
	color: #000;
	white-space: nowrap;
	text-decoration: none;
	transition: opacity .5s ease-out;
}
.menu__item:before, .menu__item:after {
	content: '';
	position: absolute;
	transition: transform .5s ease;
	left: 0;
}
.menu__item:before {
	bottom: 0;
	width: 100%;
	height: 3px;
	background: #0056EC;
	transform: scaleX(0);
}

.menu__item_active::after {
	position: absolute;
	display: block;
	content: '';
	left: 0;
	width: 100%;
	height: 3px;
	background: #0056EC;
	transition: opacity .5s, width .5s;
}

.menu__item:hover {
	opacity: .5;
}

.menu__item:not(.menu__item_active):hover:before {
	transform: scaleX(1);
}



/*Main content*/

.main {
	padding: 72px 63% 210px 0;
	background: top right no-repeat url("img/mainmg.svg");
	background-size: 768px;
}


.main__title {
	font: bold 66px/87px pt_serifbold,arial,helvetica,sans-serif;
	margin: 0 0 37px 0;
	color: #000000;
}

.main__title_text_highlight {
	background: #ECF3FF;
}

.main__description {
	font: 22px/24px roboto;
	padding: 3px 18% 38px 0;
}
.main__button {
	font: 500 18px/21px roboto;
	color: #ffffff;
	text-decoration: none;
	padding: 16px 21px;
	background: #0056EC;
	border-radius: 4px;
	animation: flash 2s infinite ease-out;
	transition: background-color .5s ease-in-out;
}

.main__button:hover{
	background: #EF832B;
}

@keyframes flash{
 to {
	 background: #EF832B;
 }
}

@media (max-width: 1367px) {
	.wrapper {
		width: 69%;
	}

	.header {
		margin-bottom: 84px;
	}

	.logo {
		padding-left: 46px;
		line-height: 20px;
		width: 62px;
		height: 28px;
	}

	.logo__circle {
		left: 2px;
	}

	.logo__circle_color_blue {
		left: 10px;
	}

	.menu__item {
		font: 500 14px roboto, arial, helvetica, sans-serif;
		padding-bottom: 0;
	}

	.menu__item {
		margin-right: 27px;
	}

	.menu__item:before {
		bottom: -2px;
	}

	.main {
		padding: 9px 56% 212px 0;
		background-size: 516px;
	}

	.main__title {
		font: bold 50px/66px pt_serifbold, arial, helvetica, sans-serif;
		margin: 7px 0 34px 0;
	}

	.main__description {
		font: 18px/22px Roboto,Arial,Helvitica,sans-serif;
		padding: 4px 10% 35px 1px;
	}

	.main__button {
		font: 500 14px/12px roboto;
		padding: 14px 19px;
	}

}

@media (max-width: 1025px) {

	.wrapper {
		width: 93%;
	}
}


@media (max-width: 768px) {
	.menu {
		display: none;
	}

	.logo__mobile {
		display: none;
	}

	.wrapper {
		width: 92%;
	}

	.logo__circle {
		top: 0;
	}

	.logo__circle_color_blue {
		top: 6px;
	}


	.header {
		margin-bottom: 28px;
	}

	.main {
		padding: 74% 0 0;
		background-size: 74%;
		background-position: top center;
		text-align: center;
	}

	.main__title {
		margin-bottom: 44px;
		font: bold 30px/40px pt_serifbold,Arial,Helvitica,sans-serif;
	}

	.main__description {
		margin-bottom: 13px;
		font: 500 16px/19px Roboto,Arial,Helvitica,sans-serif;
		padding-left: 10%;
	}

	.main__button {
		font:500 14px/16px Roboto,Arial,Helvitica,sans-serif;
	}


	/* скрываем чекбокс */
	#menu__toggle {
		display: block;
		opacity: 0;
	}

	/* стилизуем кнопку */
	.menu__btn {
		display: flex; /* используем flex для центрирования содержимого */
		align-items: center; /* центрируем содержимое кнопки */
		position: fixed;
		top: 27px;
		right: 23px;
		width: 26px;
		height: 26px;
		cursor: pointer;
		z-index: 1;
	}

	/* добавляем "гамбургер" */
	.menu__btn > span,
	.menu__btn > span::before,
	.menu__btn > span::after {
		display: block;
		position: absolute;
		width: 100%;
		height: 3px;
		background-color: #0056EC;
	}

	.menu__btn > span::before {
		content: '';
		top: -8px;
	}

	.menu__btn > span::after {
		content: '';
		top: 8px;
	}

	/* контейнер меню */
	.menu {
		display: block;
		position: fixed;
		visibility: hidden;
		opacity: 0;
		top: 0;
		right: 0;
		width: 100%;
		height: 100%;
		margin: 0;
		padding: 0;
		list-style: none;
		text-align: center;
		background-color: #ECEFF1;
		box-shadow: 1px 0 6px rgba(0, 0, 0, .2);
	}

	/* элементы меню */
	.menu__item {
		display: block;
		top: 25%;
		left: 3%;
		width: 87%;
		height: 38px;
		padding: 25px 23px;
		color: #000000;
		font: 500 46px/31px Roboto, Arial, Helvitica, sans-serif;
		text-decoration: none;
	}

	.menu__item:before {
		bottom: -2px;
		width: 100%;
	}

	.menu__item:last-child {
		margin-right: 31px;
	}

	.menu__item:hover {
		background-color: #C8DBFB;
	}

	.menu__item_active::after {
		display: none;
	}

	.menu__item:before {
		display: none;
	}

	#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 {
		visibility: visible;
		right: 0;
		opacity: 1;
		transition: opacity .5s ease-out;
	}

	.menu__btn > span,
	.menu__btn > span::before,
	.menu__btn > span::after {
		transition-duration: .25s;
	}

	.menu {
		transition-duration: .25s;
	}

	.menu__item {
		transition-duration: .25s;
	}


}

@media (max-width: 376px) {
	.menu {
		display: none;
	}

	.wrapper {
		width: 92%;
	}

	.logo__mobile {
		display: none;
	}

	.logo__circle {
		top: 14px;
	}

	.logo__circle_color_blue {
		top: 22px;
	}

	.header {
		margin-bottom: 9px;
		padding: 21px 0;
	}

	.main {
		background-size: 85%;
		padding: 74% 0 0;
	}

	.main__title {
		font-family: pt_serifbold,Arial,Helvitica,sans-serif;
		margin: 16px 0 34px 3px;
		margin-bottom: 27px;
	}

	.main__description {
		margin-bottom: 36px;
		padding: 3px 14%;
	}

	/* скрываем чекбокс */


	/* стилизуем кнопку */


	/* добавляем "гамбургер" */




	/* контейнер меню */
	.menu {
		display: block;
		position: fixed;
		visibility: hidden;
		opacity: 0;
		top: 0;
		right: 0;
		width: 100%;
		height: 100%;
		margin: 0;
		padding: 0;
		list-style: none;
		text-align: center;
		background-color: #ECEFF1;
		box-shadow: 1px 0 6px rgba(0, 0, 0, .2);
	}

	/* элементы меню */
	.menu__item {
		display: block;
		top: 174px;
		width: 87%;
		height: 36px;
		padding: 12px 23px;
		color: #000000;
		font:500 30px/36px Roboto, Arial, Helvitica, sans-serif;
		text-decoration: none;
	}

	.menu__item:before {
		bottom: -2px;
		width: 100%;
	}

	.menu__item:last-child {
		margin-right: 31px;
	}

	.menu__item:hover {
		background-color: #C8DBFB;
	}

	.menu__item_active::after {
		display: none;
	}

	.menu__item:before {
		display: none;
	}

	#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 {
		visibility: visible;
		right: 0;
		opacity: 1;
		transition: opacity .5s ease-out;
	}

	.menu__btn > span,
	.menu__btn > span::before,
	.menu__btn > span::after {
		transition-duration: .25s;
	}

	.menu {
		transition-duration: .25s;
	}

	.menu__item {
		transition-duration: .25s;
	}

}