* {
  padding: 0px;
  margin: 0px;
  border: none;
}

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

/* Links */

a,
a:link,
a:visited {
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

/* Common */

aside,
nav,
footer,
title,
section,
main {
  display: block;
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
  font-size: inherit;
  font-weight: inherit;
}

ul,
ul li {
  list-style: none;
}

img {
  vertical-align: top;
}

img,
svg {
  max-width: 100%;
  height: auto;
}

address {
  font-style: normal;
}

input,
textarea,
button,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background-color: transparent;
}

input::-ms-clear {
  display: none;
}

button,
input[type="submit"] {
  display: inline-block;
  box-shadow: none;
  background-color: transparent;
  background: none;
  cursor: pointer;
}

input:focus,
input:active,
button:focus,
button:active {
  outline: none;
}

button::-moz-focus-inner {
  padding: 0;
  border: 0;
}

label {
  cursor: pointer;
}

legend {
  display: block;
}

body {
  position: relative;
  z-index: -1;
}

.start {
  position: relative;
  width: 100%;
  height: 100vh;
  background: url(./images/start.jpg) no-repeat center center;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.start_title-container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 1150px;
  width: 100%;
}

.start_school-name {
  max-width: 685px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 20px;
  font-family: "Montserrat", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 35px;
  color: #D04E43;
  text-transform: uppercase;
  text-align: center;
}

.start_text {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  font-family: "Luckiest Guy", cursive;
  font-weight: bold;
  font-style: normal;
  font-size: 80px;
  color: #fefbf0;
  text-transform: uppercase;
  letter-spacing: 6px;
}

.start_button {
  display: block;
  width: 320px;
  height: 60px;
  margin: 50px auto 0;
  border-radius: 30px;
  background-color: #fefbf0;
  font-family: "Luckiest Guy", cursive;
  font-weight: bold;
  font-style: normal;
  font-size: 40px;
  color: #D04E43;
  text-transform: uppercase;
  transition: all .5s linear;
}

.start_button:hover {
  background-color: #d4d2c9;
  transform: scale(1.2);
}

.loader {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  padding-top: 30vh;
  height: 100vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: none;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -ms-flex-direction: column;
  flex-direction: column;
  background: #1a1a1b;
  font-family: 'Poppins', sans-serif;
  overflow: hidden;
}

.text {
  position: relative;
  top: 5rem;
  color: #f1f1f1;
  font-size: 1.8rem;
  font-weight: 700;
}

.line {
  position: relative;
  width: 40rem;
  height: 0.6rem;
  border-radius: 3rem;
  background: #0f0f0f3b;
}

.line::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  border-radius: 3rem;
  height: 100%;
  background: #f95959;
  -webkit-animation: line_drow 10s ease-out infinite;
  animation: line_drow 10s ease-out infinite;
  -webkit-animation-timing-function: cubic-bezier(0.71, 0.22, 0.29, 0.73);
  animation-timing-function: cubic-bezier(0.71, 0.22, 0.29, 0.73);
}

.line .pen {
  position: absolute;
  top: -70px;
  left: 0;
  width: 25rem;
  height: 4rem;
  line-height: 4rem;
  background: rgba(249, 89, 89, 0.07);
  text-align: center;
  -webkit-transform: translate(1%, -365%) rotate(-45deg);
  transform: translate(1%, -365%) rotate(-45deg);
  -webkit-transform-origin: center;
  transform-origin: center;
  -webkit-animation: pen_move 10s ease-out infinite;
  animation: pen_move 10s ease-out infinite;
  -webkit-animation-timing-function: cubic-bezier(0.71, 0.22, 0.29, 0.73);
  animation-timing-function: cubic-bezier(0.71, 0.22, 0.29, 0.73);
}

.line .pen .pen_overlay {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  overflow: hidden;
}

.line .pen .pen_overlay::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: #f95959;
  z-index: -1;
  -webkit-animation: color_empty 10s ease-out infinite;
  animation: color_empty 10s ease-out infinite;
  -webkit-animation-timing-function: cubic-bezier(0.71, 0.22, 0.29, 0.73);
  animation-timing-function: cubic-bezier(0.71, 0.22, 0.29, 0.73);
}

.line .pen .pen_overlay::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: 0%;
  background: #f95959;
  z-index: -1;
  -webkit-animation: color_full 10s ease-out infinite;
  animation: color_full 10s ease-out infinite;
  -webkit-animation-timing-function: cubic-bezier(0.71, 0.22, 0.29, 0.73);
  animation-timing-function: cubic-bezier(0.71, 0.22, 0.29, 0.73);
}

.line .pen .pen_top {
  position: absolute;
  top: 0;
  left: 0;
  width: 8%;
  height: 100%;
  -webkit-transform: translateX(-95%);
  transform: translateX(-95%);
  background: #34374c;
}

.line .pen .pen_top::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 0.8rem;
  border-style: solid;
  border-color: transparent #34374c transparent transparent;
  border-width: 2rem 4rem 2rem 0;
  -webkit-transform: translateX(-101%);
  transform: translateX(-101%);
}

.line .pen .pen_top::after {
  content: "";
  position: absolute;
  top: 50%;
  left: -100%;
  width: 1rem;
  height: 1rem;
  border-radius: 1rem 0 0 1rem;
  background: #f95959;
  -webkit-transform: translate(-215%, -50%);
  transform: translate(-215%, -50%);
}

.line .pen .pen_bottom {
  position: absolute;
  top: 0;
  right: 0;
  width: 12%;
  height: 102%;
  border-radius: 0 0.8rem 0.8rem 0;
  -webkit-transform: translate(90%, -1%);
  transform: translate(90%, -1%);
  background: #34374c;
}

@-webkit-keyframes line_drow {

  0%,
  90%,
  100% {
    width: 0;
  }

  50%,
  60% {
    width: 100%;
  }
}

@keyframes line_drow {

  0%,
  90%,
  100% {
    width: 0;
  }

  50%,
  60% {
    width: 100%;
  }
}

@-webkit-keyframes color_empty {
  0% {
    left: 0;
  }

  50%,
  60% {
    left: -100%;
  }

  90%,
  100% {
    left: -100%;
  }
}

@keyframes color_empty {
  0% {
    left: 0;
  }

  50%,
  60% {
    left: -100%;
  }

  90%,
  100% {
    left: -100%;
  }
}

@-webkit-keyframes color_full {
  0% {
    width: 0;
  }

  50%,
  60% {
    width: 0;
  }

  90%,
  100% {
    width: 100%;
  }
}

@keyframes color_full {
  0% {
    width: 0;
  }

  50%,
  60% {
    width: 0;
  }

  90%,
  100% {
    width: 100%;
  }
}

@-webkit-keyframes pen_move {
  0% {
    left: 0;
    -webkit-transform: translate(1%, -365%) rotate(-45deg);
    transform: translate(1%, -365%) rotate(-45deg);
  }

  50% {
    left: 100%;
    -webkit-transform: translate(1%, -365%) rotate(-45deg);
    transform: translate(1%, -365%) rotate(-45deg);
  }

  55% {
    left: 100%;
    -webkit-transform: translate(1%, -385%) rotate(-45deg);
    transform: translate(1%, -385%) rotate(-45deg);
  }

  60% {
    left: 100%;
    -webkit-transform: translate(-8%, -310%) rotate(110deg);
    transform: translate(-8%, -310%) rotate(110deg);
  }

  90% {
    left: 0%;
    -webkit-transform: translate(-8%, -310%) rotate(110deg);
    transform: translate(-8%, -310%) rotate(110deg);
  }

  95% {
    left: 0%;
    -webkit-transform: translate(-8%, -450%) rotate(110deg);
    transform: translate(-8%, -450%) rotate(110deg);
  }

  100% {
    -webkit-transform: translate(1%, -365%) rotate(315deg);
    transform: translate(1%, -365%) rotate(315deg);
  }
}

@keyframes pen_move {
  0% {
    left: 0;
    -webkit-transform: translate(1%, -365%) rotate(-45deg);
    transform: translate(1%, -365%) rotate(-45deg);
  }

  50% {
    left: 100%;
    -webkit-transform: translate(1%, -365%) rotate(-45deg);
    transform: translate(1%, -365%) rotate(-45deg);
  }

  55% {
    left: 100%;
    -webkit-transform: translate(1%, -385%) rotate(-45deg);
    transform: translate(1%, -385%) rotate(-45deg);
  }

  60% {
    left: 100%;
    -webkit-transform: translate(-8%, -310%) rotate(110deg);
    transform: translate(-8%, -310%) rotate(110deg);
  }

  90% {
    left: 0%;
    -webkit-transform: translate(-8%, -310%) rotate(110deg);
    transform: translate(-8%, -310%) rotate(110deg);
  }

  95% {
    left: 0%;
    -webkit-transform: translate(-8%, -450%) rotate(110deg);
    transform: translate(-8%, -450%) rotate(110deg);
  }

  100% {
    -webkit-transform: translate(1%, -365%) rotate(315deg);
    transform: translate(1%, -365%) rotate(315deg);
  }
}

.classroom {
  display: none;
  width: 100%;
  background-color: #FFEEC7;
  user-select: none;
  -moz-user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
}

.classroom_section {
  position: relative;
  display: none;
  width: 100%;
  max-width: 1920px;
  height: 100%;
  min-height: calc(100vh - 318px);
  margin: 0 auto;
  padding: 10px;
}

.classroom_header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  max-width: 1920px;
  height: 120px;
  margin: 0 auto;
  padding: 10px;
}

.logo {
  width: 100px;
}

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

.navbar_item {
  position: relative;
  margin: 10px;
  font-family: "Montserrat", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 16px;
  color: #2f364f;
  text-transform: uppercase;
  cursor: pointer;
}

.active {
  position: relative;
  cursor: default;
}

.active::after {
  position: absolute;
  left: 0;
  bottom: -5px;
  content: "";
  height: 5px;
  width: 100%;
  background-color: #2f364f;
}

.navbar_item:not(.active)::after {
  position: absolute;
  left: 0;
  bottom: -5px;
  content: "";
  height: 5px;
  width: 0%;
  background-color: #2f364f;
  transition: all .2s linear;
}

.navbar_item:hover.navbar_item::after {
  width: 100%;
}

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

.classroom_title-text {
  padding-top: 50px;
  height: 600px;
}

.title_text {
  width: 615px;
  padding-left: 90px;
  text-align: center;
  font-family: "Luckiest Guy", cursive;
  font-weight: 400;
  font-style: normal;
  font-size: 66px;
  color: #2f364f;
  text-transform: uppercase;
}

.classroom_title:nth-child(2) {
  margin-left: 140px;
}

.classroom_title:nth-child(3) {
  margin-left: 280px;
}

.classroom_title:last-child {
  margin-left: 420px;
}

.classroom_start-image {
  position: absolute;
  top: 0;
  right: 0;
  width: 960px;
  height: 790px;
}

.hamburger-menu {
  display: none;
}

.standards-menu {
  height: 100%;
  padding: 50px;
}

.menu-items {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: start;
  height: 100%;
}

.menu-item {
  padding: 10px 40px 0;
  background-image: url(./images/documents.svg);
  background-position: left center;
  background-repeat: no-repeat;
  background-size: 35px;
  height: 100%;
  min-height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.menu-item:hover .menu-link {
  color: #3f539b;
}

.menu-link {
  font-family: "Luckiest Guy", cursive;
  font-weight: 400;
  font-style: normal;
  font-size: 22px;
  color: #2f364f;
  text-transform: uppercase;
}

.olimpiads_start-image {
  position: absolute;
  top: 0;
  right: 0;
  width: 960px;
  height: 790px;
}

.olimpiads_classes {
  display: flex;
  height: 100%;
  min-height: 600px;
  width: 750px;
}

.classes_panel {
  position: relative;
  flex: 0.5;
  margin: 0;
  background-size: cover;
  background-position: center;
  cursor: pointer;
  transition: flex 0.3s linear;
  -webkit-transition: all 300ms linear;
  overflow: hidden;
}

.panel_dark {
  position: absolute;
  top: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  background-color: #2d2dd6;
  opacity: 0.4;
}

.class_title {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200px;
  font-family: "Montserrat", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 32px;
  color: #1c2b63;
  text-transform: uppercase;
  text-align: center;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.classes_panel:hover .panel_dark {
  opacity: 0.8;
}

.classes_panel:first-child {
  background-image: url(./images/class_1.jpg);
}

.classes_panel:nth-child(2) {
  background-image: url(./images/class_2.jpg);
}

.classes_panel:nth-child(3) {
  background-image: url(./images/class_3.jpg);
}

.classes_panel:last-child {
  background-image: url(./images/class_4.jpg);
}

.panel_container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 50%;
  left: -999px;
  transform: translate(-50%, -50%);
  width: 100%;
  transition: all 0.3s linear;
}

.panel_container h3 {
  margin: 0;
  border: 0;
  font-family: "Montserrat", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 46px;
  color: #3C3372;
  text-align: center;
  text-transform: uppercase;
}

.olimpiads_subjects {
  margin-top: 20px;
}

.panel_container .olimpiads_subject {
  margin: 0;
  padding: 2px;
  border: 0;
  text-align: center;
}

.olimpiads_link {
  font-family: "Montserrat", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 32px;
  color: #3C3372;
}

.olimpiads_subject:hover .olimpiads_link {
  color: #6d5ad4;
}

.classes_panel.classes_active {
  flex: 1;
}

.classes_panel.classes_active .panel_container {
  left: 50%;
}

.classes_panel.classes_active .panel_dark,
.classes_panel.classes_active .class_title {
  display: none;
}

.reaserches_start-image {
  position: absolute;
  top: 0;
  right: 0;
  width: 960px;
  height: 790px;
  padding: 30px;
}

.reaserches_container {
  width: 920px;
  padding: 40px;
  background-image: url(./images/board.jpg);
  background-position: center;
  background-size: contain;
  background-repeat: no-repeat;
}

.reaserches_files {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
}

.files_item {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  width: 200px;
  height: 220px;
  padding: 30px;
  font-family: "Montserrat", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 12px;
  text-align: center;
  text-transform: uppercase;
  color: #1a1a1b;
  background-image: url(./images/list.png);
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  cursor: pointer;
}

.files_item::after {
  position: absolute;
  top: 0;
  left: 10px;
  width: 180px;
  height: 100%;
  content: '';
  background-image: url(./images/download.svg);
  background-position: center center;
  background-repeat: no-repeat;
  background-size: 100px;
  opacity: 0;
  background-color: #1a1a1b;
}

.files_item:hover.files_item::after {
  opacity: 0.9;
}

.distance_container {
  display: flex;
  justify-content: space-around;
  align-items: center;
  width: 100%;
}

.distance_block {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 420px;
  height: 420px;
  border-radius: 20px;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  cursor: pointer;
  transition: all 5s linear;
}

.block_title {
  position: absolute;
  bottom: 5px;
  font-family: "Montserrat", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 36px;
  color: #f1f1f1;
  text-transform: uppercase;
  text-align: center;
}

.distance_block:first-child {
  background-image: url(./images/lections.png);
}

.distance_block:nth-child(2) {
  background-image: url(./images/games.png);
}

.distance_block:nth-child(3) {
  background-image: url(./images/books.png);
}

.distance_block:last-child {
  background-image: url(./images/trainings.png);
}

.distance_block-r {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
  width: 350px;
  padding: 15px 10px;
  font-family: "Montserrat", sans-serif;
  font-weight: 900;
  font-style: normal;
  font-size: 22px;
  color: #f8f8f8;
  text-align: center;
  text-transform: uppercase;
  -webkit-transition: all .7s ease-in-out;
  transition: all .7s ease-in-out;
  -webkit-transform: perspective(500px) rotateX(-90deg);
  transform: perspective(500px) rotateX(-90deg);
  -webkit-transform-origin: 50% 50%;
  -ms-transform-origin: 50% 50%;
  transform-origin: 50% 50%;
  opacity: 0;
  -webkit-box-shadow: 0px 0px 15px 15px rgba(255, 255, 255, 0.5);
  -moz-box-shadow: 0px 0px 15px 15px rgba(255, 255, 255, 0.5);
  box-shadow: 0px 0px 15px 15px rgba(255, 255, 255, 0.5);
}

.distance_block:first-child .distance_block-r {
  background-color: #3bb2ff;
}

.distance_block:nth-child(2) .distance_block-r {
  background-color: #161e35;
}

.distance_block:nth-child(3) .distance_block-r {
  background-color: #ba9bc9;
}

.distance_block:last-child .distance_block-r {
  background-color: #92BAEB;
}

.distance_block:hover .distance_block-r {
  -webkit-transform: rotateX(0);
  transform: rotateX(0);
  opacity: 0.9;
}

.block_button {
  display: flex;
  align-self: center;
  margin-top: 20px;
  padding: 20px 40px;
  border: 3px solid #e74c3c;
  border-radius: 15px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
  text-decoration: none;
  text-align: center;
  text-transform: uppercase;
  color: #e74c3c;
  appearance: none;
  background-color: transparent;
  cursor: pointer;
  transition: box-shadow 300ms ease-in-out, color 300ms ease-in-out;
}

.block_button:hover {
  color: #fff;
  outline: 0;
  box-shadow: 0 0 40px 40px #e74c3c inset;
}

.lifehacks {
  padding-left: 100px;
}

.lifehacks_container {
  width: 600px;
  padding-top: 100px;
  background-image: url(./images/notebook.png);
  background-size: contain;
  background-position: center center;
  background-repeat: no-repeat;
}

.lifehacks_start-image {
  position: absolute;
  top: 0;
  right: 0;
  width: 960px;
  height: 790px;
  padding: 0 30px 50px;
}

.lifehacks_title {
  width: 320px;
  margin-left: 115px;
  margin-bottom: 20px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 900;
  font-style: italic;
  font-size: 20px;
  text-transform: uppercase;
  text-align: center;
}

.lifehacks_list {
  height: 500px;
  width: 450px;
  padding-left: 115px;
  font-family: "Playwrite NO", cursive;
  font-weight: 400;
  font-style: normal;
  font-size: 14px;
}

.lifehacks_item {
  padding-left: 5px;
  margin-left: 15px;
  margin-bottom: 10px;
}

.lifehacks_links {
  color: #1a1a1b;
}

.lifehacks_item:hover .lifehacks_links {
  color: #6666b4;
}

.lifehacks_item:hover {
  color: #6666b4;
}

.footer_container {
  background-color: #ffe4a3;
}

.classroom_footer {
  display: flex;
  justify-content: start;
  align-items: center;
  width: 100%;
  max-width: 1920px;
  height: 198px;
  margin: 0 auto;
  padding-left: 50px;
}

.footer_contacts {
  display: flex;
  justify-content: start;
  align-items: center;
  height: 198px;
  padding: 30px;
}

.contacts_item {
  cursor: pointer;
  transition: all .5s linear;
}

.contacts_item:hover {
  transform: scale(1.2);
}

.footer_school-name {
  font-family: "Montserrat", sans-serif;
  font-weight: bold;
  font-style: normal;
  font-size: 20px;
  color: #2f364f;
}


@media (max-width: 1800px) {
  .navbar_item {
    font-size: 12px;
  }

  .title_text {
    width: 550px;
    padding-left: 0;
    font-size: 50px;
  }

  .classroom_title-text {
    padding-top: 100px;
  }

  .classroom_start-image {
    top: 60px;
    width: 660px;
    height: 580px;
  }

  .olimpiads_classes {
    width: 550px;
  }

  .olimpiads_start-image {
    top: 60px;
    width: 760px;
    height: 580px;
  }

  .line {
    width: 20rem;
  }

  .line .pen {
    top: -30px;
    left: -40px;
    width: 10rem;
    height: 2rem;
    -webkit-transform: translate(1%, -365%) rotate(-75deg);
    transform: translate(1%, -365%) rotate(-75deg);
  }

  @-webkit-keyframes pen_move {
    0% {
      left: -40px;
      -webkit-transform: translate(1%, -365%) rotate(-75deg);
      transform: translate(1%, -365%) rotate(-75deg);
    }

    50% {
      left: 80%;
      -webkit-transform: translate(1%, -365%) rotate(-75deg);
      transform: translate(1%, -365%) rotate(-75deg);
    }

    55% {
      left: 80%;
      -webkit-transform: translate(1%, -385%) rotate(-75deg);
      transform: translate(1%, -385%) rotate(-75deg);
    }

    60% {
      left: 80%;
      -webkit-transform: translate(-8%, -310%) rotate(110deg);
      transform: translate(-8%, -310%) rotate(110deg);
    }

    90% {
      left: 0%;
      -webkit-transform: translate(-8%, -310%) rotate(110deg);
      transform: translate(-8%, -310%) rotate(110deg);
    }

    95% {
      left: 0%;
      -webkit-transform: translate(-8%, -450%) rotate(110deg);
      transform: translate(-8%, -450%) rotate(110deg);
    }

    100% {
      -webkit-transform: translate(1%, -365%) rotate(315deg);
      transform: translate(1%, -365%) rotate(315deg);
    }
  }

  @keyframes pen_move {
    0% {
      left: -40px;
      -webkit-transform: translate(1%, -365%) rotate(-75deg);
      transform: translate(1%, -365%) rotate(-75deg);
    }

    50% {
      left: 80%;
      -webkit-transform: translate(1%, -365%) rotate(-75deg);
      transform: translate(1%, -365%) rotate(-75deg);
    }

    55% {
      left: 80%;
      -webkit-transform: translate(1%, -385%) rotate(-75deg);
      transform: translate(1%, -385%) rotate(-75deg);
    }

    60% {
      left: 80%;
      -webkit-transform: translate(-8%, -310%) rotate(110deg);
      transform: translate(-8%, -310%) rotate(110deg);
    }

    90% {
      left: -40px;
      -webkit-transform: translate(-8%, -310%) rotate(110deg);
      transform: translate(-8%, -310%) rotate(110deg);
    }

    95% {
      left: -40px;
      -webkit-transform: translate(-8%, -450%) rotate(110deg);
      transform: translate(-8%, -450%) rotate(110deg);
    }

    100% {
      -webkit-transform: translate(1%, -365%) rotate(315deg);
      transform: translate(1%, -365%) rotate(315deg);
    }
  }

  .line .pen .pen_top::before {
    border-width: 1rem 2rem 1rem 0;
  }

  .line .pen .pen_top::after {
    left: 0;
  }

  .text {
    font-size: 1.2rem;
  }

  .menu-link {
    font-size: 16px;
  }

  .reaserches_container {
    width: 700px;
    padding: 60px 20px 20px 20px;
  }

  .reaserches_start-image {
    width: 720px;
    height: 540px;
  }

  .reaserches_files {
    padding: 10px;
  }

  .files_item {
    width: 140px;
    height: 170px;
    padding: 30px;
    font-size: 8px;
  }

  .files_item::after {
    left: 0;
    width: 100%;
    background-size: 60px;
  }

  .distance_block {
    width: 280px;
    height: 280px;
  }

  .block_title {
    font-size: 18px;
  }

  .distance_block-r {
    width: 260px;
    padding: 15px 10px;
    font-size: 14px;
  }

  .block_button {
    padding: 10px 20px;
    font-size: 14px;
  }

  .lifehacks_start-image {
    top: 60px;
    width: 720px;
    height: 540px;
  }
}

@media (max-width: 1400px) {
  .navbar_item {
    font-size: 10px;
  }

  .title_text {
    width: 350px;
    padding-left: 10px;
    font-size: 30px;
  }

  .olimpiads_start-image {
    top: 60px;
    width: 660px;
    height: 580px;
  }

  .footer_school-name {
    font-size: 14px;
  }

  .contacts_icon {
    width: 32px;
    height: 32px;
  }

  .start_text {
    font-size: 36px;
  }

  .logo {
    width: 80px;
  }

  .classroom_section {
    height: 100%;
    min-height: calc(100vh - 200px);
  }

  .classroom_footer,
  .footer_contacts {
    height: 80px;
  }

  .classroom_title:nth-child(2) {
    margin-left: 100px;
  }

  .classroom_title:nth-child(3) {
    margin-left: 200px;
  }

  .classroom_title:last-child {
    margin-left: 300px;
  }

  .reaserches {
    flex-direction: column-reverse;
    justify-content: center;
    align-items: center;
  }

  .reaserches_start-image {
    position: relative;
    top: 0;
    width: 960px;
    height: 790px;
  }

  .reaserches_container {
    width: 920px;
    padding: 40px;
  }

  .reaserches_files {
    padding: 10px;
  }

  .files_item {
    width: 200px;
    height: 220px;
    padding: 30px;
    font-size: 12px;
  }

  .files_item::after {
    left: 10px;
    width: 180px;
    height: 100%;
  }

  .lifehacks {
    padding-left: 20px;
  }

  .lifehacks_container {
    width: 500px;
  }

  .lifehacks_start-image {

    width: 660px;
    height: 580px;
  }

  .lifehacks_title {
    margin-left: 45px;
  }
  
  .lifehacks_list {
    width: 400px;
    padding-left: 45px;
  }

}

@media (max-width: 1250px) {
  .start_school-name {
    font-size: 25px;
  }

  .title_text {
    width: 280px;
    padding-left: 5px;
    font-size: 32px;
  }

  .classroom_title-text {
    height: 300px;
    padding-top: 50px;
    padding-bottom: 50px;
  }

  .classroom_title_container {
    flex-direction: column;
    justify-content: center;
  }

  .classroom_start-image {
    position: relative;
    top: 0;
    width: 560px;
    height: 560px;
  }

  .classroom_olimpiads {
    flex-direction: column-reverse;
    align-items: center;
    justify-content: center;
  }

  .classes_panel {
    height: 600px;
  }

  .olimpiads_start-image {
    top: 0;
    position: relative;
    width: 560px;
    height: 560px;
  }

  .classroom_title:nth-child(2) {
    margin-left: 100px;
  }

  .classroom_title:nth-child(3) {
    margin-left: 200px;
  }

  .classroom_title:last-child {
    margin-left: 300px;
  }

  .hamburger-menu {
    display: block;
  }

  .header_navbar {
    display: none;
  }

  #menu_toggle {
    opacity: 0;
  }

  .menu_btn {
    display: flex;
    align-items: center;
    position: absolute;
    top: 40px;
    right: 60px;
    width: 26px;
    height: 26px;
    cursor: pointer;
    z-index: 999;
  }

  .menu_btn>span,
  .menu_btn>span::before,
  .menu_btn>span::after {
    display: block;
    position: absolute;
    width: 100%;
    height: 2px;
    z-index: 0;
    background-color: #616161;
    pointer-events: none;
  }

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

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


  .menu_container {
    display: block;
    position: fixed;
    visibility: hidden;
    top: 0;
    right: -100%;
    z-index: 1;
    width: 300px;
    margin: 0;
    padding: 80px 0;
    list-style: none;
    text-align: center;
    background-color: #ffe4a3;
    box-shadow: 1px 0px 6px rgba(0, 0, 0, .2);
    transition: all .3s linear;
  }

  .menu_item {
    display: block;
    padding: 12px 24px;
    color: #333;
    font-family: 'Roboto', sans-serif;
    font-size: 14px;
    font-weight: 600;
    text-decoration: 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);
  }

  .standards-menu {
    padding: 0;
    padding-left: 5px;
  }

  .reaserches_container {
    width: 700px;
  }

  .reaserches_start-image {
    width: 720px;
    height: 540px;
  }

  .reaserches_files {
    padding: 10px;
  }

  .files_item {
    width: 140px;
    height: 170px;
    padding: 30px;
    font-size: 8px;
  }

  .files_item::after {
    left: 0;
    width: 100%;
    background-size: 60px;
  }

  .distance_container {
    width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .distance_block {
    justify-self: center;
  }

  .lifehacks {
    flex-direction: column-reverse;
    align-items: center;
    padding-left: 20px;
  }

  .lifehacks_container {
    margin-bottom: 50px;
  }

  .lifehacks_start-image {
    top: 0;
    position: relative;
    width: 560px;
    height: 560px;
  }
}

@media (max-width: 900px) {
  .start_text {
    font-size: 30px;
  }

  .start_school-name {
    font-size: 15px;
  }

  .start_button {
    display: block;
    width: 240px;
    height: 40px;
    font-size: 24px;
  }

  .line {
    width: 10rem;
  }

  .line .pen {
    top: -15px;
    left: -20px;
    width: 5rem;
    height: 1rem;
    -webkit-transform: translate(1%, -365%) rotate(-75deg);
    transform: translate(1%, -365%) rotate(-75deg);
  }

  .line .pen .pen_top::before {
    border-width: .5rem 1rem .5rem 0;
  }

  .line .pen .pen_top::after {
    left: 0;
    width: .5rem;
    height: .5rem;
  }

  .text {
    font-size: .8rem;
  }

  @-webkit-keyframes pen_move {
    0% {
      left: -20px;
      -webkit-transform: translate(1%, -365%) rotate(-75deg);
      transform: translate(1%, -365%) rotate(-75deg);
    }

    50% {
      left: 80%;
      -webkit-transform: translate(1%, -365%) rotate(-75deg);
      transform: translate(1%, -365%) rotate(-75deg);
    }

    55% {
      left: 80%;
      -webkit-transform: translate(1%, -385%) rotate(-75deg);
      transform: translate(1%, -385%) rotate(-75deg);
    }

    60% {
      left: 80%;
      -webkit-transform: translate(-8%, -310%) rotate(110deg);
      transform: translate(-8%, -310%) rotate(110deg);
    }

    90% {
      left: 0%;
      -webkit-transform: translate(-8%, -310%) rotate(110deg);
      transform: translate(-8%, -310%) rotate(110deg);
    }

    95% {
      left: 0%;
      -webkit-transform: translate(-8%, -450%) rotate(110deg);
      transform: translate(-8%, -450%) rotate(110deg);
    }

    100% {
      -webkit-transform: translate(1%, -365%) rotate(315deg);
      transform: translate(1%, -365%) rotate(315deg);
    }
  }

  @keyframes pen_move {
    0% {
      left: -20px;
      -webkit-transform: translate(1%, -365%) rotate(-75deg);
      transform: translate(1%, -365%) rotate(-75deg);
    }

    50% {
      left: 80%;
      -webkit-transform: translate(1%, -365%) rotate(-75deg);
      transform: translate(1%, -365%) rotate(-75deg);
    }

    55% {
      left: 80%;
      -webkit-transform: translate(1%, -385%) rotate(-75deg);
      transform: translate(1%, -385%) rotate(-75deg);
    }

    60% {
      left: 80%;
      -webkit-transform: translate(-8%, -310%) rotate(110deg);
      transform: translate(-8%, -310%) rotate(110deg);
    }

    90% {
      left: -20px;
      -webkit-transform: translate(-8%, -310%) rotate(110deg);
      transform: translate(-8%, -310%) rotate(110deg);
    }

    95% {
      left: -20px;
      -webkit-transform: translate(-8%, -450%) rotate(110deg);
      transform: translate(-8%, -450%) rotate(110deg);
    }

    100% {
      -webkit-transform: translate(1%, -365%) rotate(315deg);
      transform: translate(1%, -365%) rotate(315deg);
    }
  }

  .reaserches_container {
    width: 500px;
    padding: 25px;
  }

  .reaserches_start-image {
    width: 720px;
    height: 540px;
  }

  .reaserches_files {
    padding: 10px;
  }

  .files_item {
    width: 100px;
    height: 125px;
    padding: 30px;
    font-size: 6px;
  }

  .files_item::after {
    left: 0;
    width: 100%;
    background-size: 60px;
  }

}

@media (max-width: 600px) {

  .logo {
    width: 60px;
  }

  .title_text {
    width: 120px;
    font-size: 14px;
  }

  .classroom_start-image {
    width: 280px;
    height: 280px;
  }

  .classroom_title:nth-child(2) {
    margin-left: 60px;
  }

  .classroom_title:nth-child(3) {
    margin-left: 120px;
  }

  .classroom_title:last-child {
    margin-left: 180px;
  }

  .menu_btn {
    top: 50px;
    right: 30px;
  }

  .menu-link {
    font-size: 14px;
  }

  .olimpiads_classes {
    width: 280px;
  }

  .olimpiads_start-image {
    width: 220px;
    height: 220px;
  }

  .panel_container h3 {
    font-size: 16px;
  }

  .olimpiads_link {
    font-size: 14px;
  }

  .class_title {
    font-size: 16px;
  }

  .reaserches_container {
    display: flex;
    justify-content: space-between;
    width: 280px;
    padding: 20px;
    background-image: url(./images/board.png);
  }

  .reaserches_start-image {
    width: 220px;
    height: 220px;
  }

  .reaserches_files {
    flex-direction: column;
    justify-content: space-between;
    padding: 10px;
  }

  .files_item {
    width: 75px;
    height: 125px;
    padding: 10px;
    font-size: 5px;
  }

  .files_item::after {
    left: 0;
    width: 100%;
    background-size: 60px;
  }

  .distance_container {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
  }

  .distance_block {
    margin: 10px;
  }

  .lifehacks_container {
    width: 300px;
    padding-top: 60px;
    margin-bottom: 50px;
  }

  .lifehacks_start-image {
    width: 280px;
    height: 300px
  }

  .lifehacks_title {
    width: 260px;
    margin-left: 0;
    margin-bottom: 10px;
    font-size: 14px;
  }
  
  .lifehacks_list {
    width: 260px;
    height: 300px;
    padding-left: 20px;
    font-size: 8px;
  }

  .classroom_footer {
    padding-left: 0;
  }

  .footer_school-name {
    font-size: 10px;
  }

  .footer_contacts {
    padding: 10px;
  }
}