:root {
  --black: #000;
  --white: #fff;
  --white-hover: #8f8f8f;
  --button-color-grey: #C2C2C2;
  --bg: #1C1F21;
  --bg-menu: #24292D;
  --bg-menu-hover: #323B43;
  --bg-lead-advantages: #3C3C3C;
  --bg-service-card: #2B2E30;
  --blue: #4C8DEE;
  --blue-hover: #89b5f4;
  --blue-hover-bg: #3370ca;
}
/*для кнопок 3 цвета: дефолт, тёмный и светлый для анимации*/

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/*tags*/
html {
  background-color: var(--bg);
  color: var(--white);
  font-family: "Exo 2", "Arial", sans-serif;

  overflow-x: hidden;
}

html, body, .page {
  min-height: 100%;
  /*height: 100%;*/
}

main {
  min-height: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

li {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: "Exo 2", "Arial", sans-serif;
}

/*animations*/
@keyframes rotate {
  100% {
    transform: rotate(1turn);
  }
}

/*components*/
.section {
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.pattern {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  z-index: -1;
}

.service-card .button-outline {
  column-gap: 8px;
}

.button-outline {
  position: relative;
  overflow: hidden;
  z-index: 0;
  padding: 10px 20px;
  background-color: transparent;
  color: var(--white);
  outline: none;
  border: 1px var(--white) solid;
  border-radius: 8px;
  font-size: 16px;
  text-align: center;
  text-decoration: none;
  display: flex;
  justify-content: center;
  align-items: center;
}

.button-outline_blue {
  color: var(--blue);
  border-color: var(--blue);
}

.border-animation {
  border: none;
}

.border-animation::before {
  display: flex;
  content: '';
  position: absolute;
  z-index: -2;
  width: 300%;
  height: 320%;
  background-repeat: no-repeat;
  background-size: 50% 50%, 50% 50%;
  background-position: 0 0, 100% 0, 100% 100%, 0 100%;
  background-color: var(--white-hover);
  background-image: linear-gradient(var(--button-color-grey), var(--button-color-grey)),
  linear-gradient(var(--button-color-grey), var(--button-color-grey)),
  linear-gradient(var(--button-color-grey), var(--button-color-grey)),
  linear-gradient(var(--button-color-grey), var(--button-color-grey));
}

.border-animation:hover::before {
  left: -100%;
  top: -100%;
  width: 300%;
  height: 320%;
  background-image: linear-gradient(var(--white-hover), var(--white-hover)),
  linear-gradient(var(--white), var(--white)),
  linear-gradient(var(--white-hover), var(--white-hover)),
  linear-gradient(var(--white), var(--white));
  animation: rotate 2s linear infinite;
}

.border-animation_enter-lk::before {
  width: 400px;
  height: 400px;
}

.border-animation_enter-lk:hover::before {
  left: -100px;
  top: -180px;
  width: 400px;
  height: 400px;
}

.border-animation_contact {
  color: var(--blue-hover);
}

.border-animation_contact::before {
  background-color: var(--blue);
  background-image: linear-gradient(var(--blue), var(--blue)),
  linear-gradient(var(--blue), var(--blue)),
  linear-gradient(var(--blue), var(--blue)),
  linear-gradient(var(--blue), var(--blue));
}

.border-animation_contact:hover::before {
  background-image: linear-gradient(var(--blue-hover), var(--blue-hover)),
  linear-gradient(var(--blue-hover-bg), var(--blue-hover-bg)),
  linear-gradient(var(--blue-hover), var(--blue-hover)),
  linear-gradient(var(--blue-hover-bg), var(--blue-hover-bg));
}

.border-animation::after {
  content: '';
  position: absolute;
  z-index: -1;
  left: 1px;
  top: 1px;
  width: calc(100% - 2px);
  height: calc(100% - 2px);
  background: var(--bg);
  border-radius: 7px;
}

.color-white-hover {
  /*color: #C2C2C2;*/
}

/*bem*/
.page {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  column-gap: 20px;

  padding: 20px;
}

.logo-container {
  display: flex;
}

.logo {
  max-width: 230px;
  max-height: 55px;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left;
}

.menu {

}

.menu-items {
  display: flex;
  align-items: center;
  column-gap: 20px;
}

.menu-item__name {
  display: flex;
  align-items: center;
  column-gap: 4px;
}

.menu-item_expand:hover .submenu-items{
  visibility: visible;
  opacity: 1;
}

.menu-item_expand:hover::after {
  display: flex;
}

.menu-item_expand::after {
  content: "";
  position: absolute;
  left: -16px;
  display: none;
  width: 300px;
  height: 12px;
  /*background-color: var(--black);*/
}

.menu-item_expand {
  position: relative;
}

.submenu-items {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  top: 30px;
  left: -16px;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-menu);
  border-radius: 8px;
  overflow: hidden;
  transition: opacity .2s linear;
}

.submenu-item {
  display: flex;
}

.submenu-item:hover {
  background-color: var(--bg-menu-hover);
}

.submenu-item a {
  width: 100%;
  white-space: nowrap;
  padding: 8px 16px;
}

.menu__button-login, .menu__button-call, .menu__button-email {
  display: none; /*todo: временно*/
}

.header__actions {
  display: flex;
  align-items: center;
  column-gap: 20px;
}

.button-burger {
  display: none;
}

.section_lead {
  /*height: 100%;*/
  flex-grow: 1;
  height: calc(100vh - 95px);
}

.lead {
  width: 100%;
  height: 100%;
  flex-grow: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lead__content {
  display: flex;
  flex-direction: column;
  row-gap: 30px;
}

.lead h1 {
  max-width: 950px;
}

.lead__advantages {
  display: flex;
  flex-wrap: wrap;
  max-width: 500px;
  gap: 10px;
}

.lead__advantage {
  padding: 4px 10px;
  border-radius: 100px;
  background-color: var(--bg-lead-advantages);
}

.lead__button-group {
  display: flex;
  align-items: center;
  column-gap: 20px;
}

.lead__images {
  width: 50%;
  height: 100%;
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;
  gap: 10px;
}

.lead__image {
  width: calc(50% - 5px);
  height: 100%;
  object-fit: cover;
  border-radius: 8px;
}

.lead__image_1 {
  height: calc(37vh - 5px);
}

.lead__image_2 {
  height: calc(18vh - 5px);
}

.lead__image_3 {
  height: calc(30vh - 5px);
}

.lead__image_4 {
  height: calc(25vh - 5px);
}

.lead__image_5 {
  height: calc(25vh - 5px);
}

.lead__image_6 {
  height: calc(35vh - 5px);
}

.service-cards {
  /*display: flex;*/
  /*flex-wrap: wrap;*/
  /*gap: 20px;*/

  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 1fr);
  grid-gap: 20px;
}

.service-card {
  display: flex;
  flex-direction: column;
  row-gap: 20px;

  padding: 16px;
  background-color: var(--bg-service-card);
  border-radius: 8px;

  opacity: 0; /* Начальное состояние */
  transform: translateY(50px); /* Смещение вниз */
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.service-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  column-gap: 20px;
}

.service-card__body {
  display: flex;
  flex-direction: column;
  row-gap: 15px;
}

.service-card__c-btn {
  flex-grow: 1;
  display: flex;
  align-items: end;
}




.footer {
  padding: 10px 20px;
}

.footer__content {
  display: flex;
  flex-direction: column;
  row-gap: 5px;
}

.footer__contacts, .footer__menu, .footer__docs {
  display: flex;
  justify-content: space-between;
  column-gap: 30px;
}

.footer__menu {
  display: none;
}