@import url("https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&display=swap");

:root {
  --main-color: #e6e9ff;
  --accent-color: #e16c17;
  --bg-color: #0f1017;
  --bg-light-color: #22242e;
  --bg-dark-color: #0b0c0f;
  --tertiary-color: #7e8b9e;
}

*,
html {
  margin: 0;
  padding: 0;
}
body {
  background-color: var(--bg-color);
  color: var(--main-color);
  font-family: "Poppins", sans-serif;
  font-size: 18px;
  font-style: normal;
  font-weight: 300;
  line-height: 1.7rem;
}

.hidden {
  display: none;
}

.langdev-logo {
  border: 0;
  margin-top: 1rem;
}

.langdev-logo img {
  width: 9.6875rem;
}

.langdev-logo:hover {
  text-decoration: none;
}

.content {
  margin-left: 15%;
  margin-right: 15%;
  min-width: 20rem;
}

p {
  margin-top: 1.5rem;
}

ul {
  list-style-type: square;
  margin-bottom: 1.5rem;
  margin-top: 1.5rem;
  padding-left: 2rem;
}

.logo {
  height: 6rem;
  margin: 2rem;
}

.logo-frame {
  background-color: #f0f0f0;
  height: 3rem;
  margin: 2rem;
  padding: 0.7rem;
}

.logo2 {
  margin: 3rem;
  width: 11rem;
}

.logo3 {
  height: 4rem;
  margin: 3rem;
}
.logo4 {
  margin: 2rem;
  width: 19rem;
}

h1 {
  color: #fff;
  font-family: "Poppins", sans-serif;
  font-size: 47px;
  font-style: normal;
  font-weight: 500;
  line-height: 137%;
}

h3 {
  font-family: "Poppins", sans-serif;
  margin-bottom: 1.5rem;
  margin-top: 1.5rem;
  font-size: 16px;
  font-style: normal;
  text-align: center;
  font-weight: 600;
}

h4 {
  font-family: "Poppins", sans-serif;
  font-size: 16px;
  font-style: normal;
  text-align: center;
  font-weight: 500;
}

.title-xl {
  color: #fff;
  font-family: "Poppins", sans-serif;
  font-size: 47px;
  font-style: normal;
  font-weight: 500;
  line-height: 137%;
}

.title-dates {
  color: #fff;
  font-family: "Poppins", sans-serif;
  font-size: 34px;
  font-style: normal;
  font-weight: 500;
  line-height: 120%;
}

.title-l {
  color: var(--accent-color);
  font-family: "Poppins", sans-serif;
  font-size: 21px;
  font-style: normal;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 137%;
  text-transform: uppercase;
}

.btn {
  border-radius: 0.5rem;
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  margin-top: 1.5rem;
  padding: 0.8rem 1.5rem;
  text-decoration: none;
}

a.btn:hover span {
  color: var(--accent-color);
  transition: all 0.3s ease;
}

.cta {
  background-color: var(--accent-color);
  color: #ffffff;
}

.cta:hover {
  color: #fff;
  opacity: 0.9;
}

.secondary {
  background-color: var(--bg-color);
  border: 1px solid rgba(255, 255, 255, 0.42);
  color: #ffffff;
}
.tertiary {
  color: var(--tertiary-color);
  font-family: "Poppins", sans-serif;
  font-size: 14px;
  font-style: normal;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 137%;
  margin: 3rem;
  text-transform: uppercase;
}

a,
a:visited {
  color: var(--main-color);
}
a:hover {
  color: var(--accent-color);
  transition: all 0.3s ease;
}
.ml2 {
  margin-left: 3rem;
}
.counter {
  height: 2.5rem;
}
h2,
.title-m {
  border-bottom: none;
  font-family: "Poppins", sans-serif;
  font-size: 18px;
  font-style: normal;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 137%;
  margin-top: 2rem;
  text-align: center;
  text-transform: uppercase;
}

.header {
  background-image: url("./headerimage.png");
  background-position: right top;
  background-repeat: no-repeat;
  padding: 1.625rem;
}

.header-secondary {
  display: flex;
  justify-content: space-between;
  object-fit: none;
}

.img-banner {
  margin-left: 6rem;
  object-fit: none;
  align-self: start;
}

.main {
  padding: 1.625rem;
  padding-left: 4rem;
  padding-right: 4rem;
}

.top-bar {
  align-items: center;
  display: flex;
  justify-content: space-between;
  margin-bottom: 5rem;
  margin-top: 1rem;
}

#menu-toggle {
  display: none;
}

.icon {
  gap: 0.5rem;
  height: 20px;
  text-align: left;
  width: 20px;
}

.menu-icon {
  cursor: pointer;
  display: none;
  flex-direction: column;
  height: 25px;
  justify-content: space-between;
  width: 30px;
}

.menu-icon span {
  background-color: white;
  display: block;
  height: 3px;
  transition: 0.3s;
  width: 100%;
}

.menu-icon {
  display: none;
}

.top-menu {
  display: block;
  margin-bottom: 3rem;
}

.top-menu nav a {
  border: none;
  cursor: pointer;
  text-align: left;
  width: auto;
}

.btn-exit {
  background-color: rgba(255, 255, 255, 0.7);
  border: none;
  border-radius: 10px;
  color: black;
  cursor: pointer;
  display: none;
  font-size: 1.5rem;
  font-weight: 700;
  left: 50%;
  padding: 0.5rem 1rem;
  position: fixed;
  top: 65%;
  transform: translate(-50%, -50%);
}

.btn-exit:hover {
  background-color: var(--accent-color);
}

.banner-column {
  display: grid;
  gap: 2.625rem;
  grid-template-columns: 1fr 1fr;
}

.map-container {
  margin: 0 auto;
  max-width: 600px;
  width: 100%;
}
iframe {
  border: 0;
  height: 375px;
  width: 100%;
}

.wrap {
  border: 2px dashed var(--accent-color);
  margin-top: 5rem;
  padding: 0rem 2rem 2rem 2rem;
  position: relative;
  text-align: center;
}

.wrap::before {
  display: block;
  left: 50%;
  position: absolute;
  top: -30px;
  transform: translateX(-50%);
}

.wrap1::before {
  content: url("./food-icon.png");
}

.wrap2::before {
  content: url("./wheater-icon.png");
}

@media (max-width: 900px) {
  .flex {
    display: block;
  }

  .menu-icon {
    background: black;
    display: flex;
    padding: 10px;
  }

  .top-menu {
    align-items: center;
    backdrop-filter: blur(10px);
    background-color: rgba(0, 0, 0, 0.4);
    background-image: linear-gradient(
      to bottom,
      rgba(0, 0, 0, 0.6),
      rgba(0, 0, 0, 0.3)
    );
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
    display: none;
    flex-direction: column;
    height: 100%;
    position: absolute;
    right: 0;
    top: 0;
    width: 100%;
    z-index: 2;
  }

  #menu-toggle:checked + .menu-icon + .top-menu {
    display: flex;
  }

  .top-menu nav {
    align-items: center;
    align-items: flex-end;
    display: flex;
    flex-direction: column;
  }

  .top-menu nav a {
    border: none;
    padding: 15px 0;
    text-align: center;
    width: 100%;
  }

  .top-menu nav .ml2.btn.cta {
    margin: 1rem 0;
  }

  .banner-column {
    gap: 0;
    grid-template-columns: 1fr;
  }

  .wrap {
    padding-bottom: 13rem;
  }
}

.sponsors {
  background-color: var(--bg-light-color);
  padding: 0.8rem 3rem 3rem 3rem;
}

.collaborators {
  background-color: var(--bg-color);
  padding: 3rem 3rem;
}

.mt12 {
  margin-top: 12rem;
}

.mt6 {
  margin-top: 6rem;
}

.mt3 {
  display: flex;
  gap: 20px;
  margin-top: 3rem;
  text-decoration: none;
}

.center {
  text-align: center;
}

hr {
  border: 0;
  color: #fff;
  height: 1px;
}

.banner {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  margin-top: 2rem;
}

.c1 {
  min-width: 25rem;
  padding-left: 1.9375rem;
  width: 50%;
}

.flex {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.current {
  color: var(--accent-color);
}

.sponsors img {
  background-color: var(--bg-light-color);
}

@media (max-width: 480px) {
  .main {
    padding: 0.5rem;
  }
  .c1 {
    min-width: 16rem;
    padding: 0;
  }

  .title-xl {
    font-size: 36px;
  }

  .mt3 {
    flex-direction: column;
    gap: 0;
  }

  .tertiary {
    font-size: 13px;
    letter-spacing: 0;
    margin: 0;
  }

  .content {
    margin: 0 0rem;
    min-width: unset;
  }

  .map-container {
    display: none;
  }
}

.top-menu nav a {
  border-bottom: 0px;
  padding-bottom: 1rem;
  text-decoration: none;
}

.top-menu nav a:hover {
  color: var(--accent-color);
}

.top-menu nav a.current {
  border-bottom: 3px solid var(--accent-color);
}

.top-menu nav a.cta:hover {
  color: #fff;
  opacity: 0.9;
}

.special-edition {
  border: 2px dashed var(--accent-color);
  margin-top: 3.75rem;
  padding: 0 1.5rem 3.25rem 1.5rem;
  position: relative;
}

.special-edition::before {
  content: url("./spacial-icon.png");
  display: block;
  left: 50%;
  position: absolute;
  top: 0;
  transform: translate(-50%, -50%);
}

.footer {
  margin: 4rem 0;
  padding-bottom: 1rem;
  text-align: center;
}

.bottom-line {
  border-bottom: 1px solid #7e8b9e;
  margin-bottom: 1rem;
}

/* tables */

.schedule {
  border-collapse: collapse;
  width: 100%;
}

.schedule th,
.schedule td {
  border: 3px solid black;
  padding: 0.5rem;
}

.day {
  background-color: var(--accent-color);
  color: white;
  font-weight: bold;
  text-align: center;
}

.break {
  background-color: lightgray;
}

table.schedule {
  background-color: #22242e;
  border: 1px solid;
  border-collapse: collapse;
  display: table;
  margin-bottom: 5rem;
  width: 100%;
}

table.tr.social {
  margin-top: 20px;
}

table.schedule.day1 td:nth-child(1) {
  text-align: right;
  width: 50px;
}

table.schedule.day1 tr.tl td:nth-child(1) {
  text-align: left;
}

table.schedule.day1 td:nth-child(2) {
  width: 30%;
}

table.schedule.day1 td:nth-child(3) {
  width: 15%;
}
table.schedule.day1 td:nth-child(4) {
  width: 30%;
}

table.schedule.day1 td:nth-child(5) {
  width: 15%;
}

table.schedule td:nth-child(1) {
  text-align: right;
  width: 50px;
}
table.schedule td:nth-child(2) {
  width: 60%;
}

table.schedule td:nth-child(3) {
  width: 30%;
}

table.schedule,
td {
  border: 3px solid black;
  padding: 8px;
  text-align: left;
  vertical-align: center;
}

table.schedule td.low {
  color: #a0abb9;
}

table.schedule th.day {
  background-color: var(--accent-color);
  height: 80px;
}

table.schedule tr.day {
  background-color: var(--accent-color);
}

table.schedule tr.day td {
  color: white;
  font-weight: bold;
  text-align: left;
}

table.schedule tr.break {
  background-color: #555864;
}
table.schedule tr.social {
  background-color: #2d303d;
  height: 5rem;
}

table.schedule tr.break td:nth-child(2) {
  text-align: center;
}

table.schedule.mobile {
  display: none;
}

@media (max-width: 768px) {
  table.schedule.day1 {
    display: none;
  }
  table.schedule.mobile {
    display: block;
    margin-top: 1rem;
    padding: 0;
  }
}

.empty {
  background-color: #424a56;
}
.track {
  background-color: #7e8b9e;
  font-weight: bold;
}
.lunch {
  height: 9rem;
}
.social td {
  background-color: #424a56;
  height: 12rem;
}

.inscription {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr 2fr 2fr;
  margin: 2rem 0;
  width: 100%;
}
.inscription .col1 {
  align-items: flex-end;
  display: flex;
  flex-direction: column;
  margin-right: 1rem;
}

.inscription .col1 span,
.col4 span {
  height: 3.625rem;
}

.inscription .col2,
.col3 {
  background-color: #5f6875;
  padding: 0 1rem;
  text-align: center;
}

.inscription .col1 p:nth-child(3),
.col2 p:nth-child(3),
.col3 p:nth-child(3),
.col4 p:nth-child(3) {
  padding-top: 2rem;
}

.inscription p {
  height: 5rem;
  line-height: 1.1;
}

.big {
  font-size: 1.5rem;
  font-weight: bold;
}

.col4 {
  display: none;
}

ol.instructions {
  display: block;
  margin-bottom: 3rem;
  padding-left: 3rem;
}

@media (max-width: 768px) {
  .inscription {
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr 3fr;
    margin: 2rem 0;
    width: 100%;
  }

  .col4 {
    align-items: flex-end;
    display: flex;
    flex-direction: column;
    margin-right: 1rem;
  }
}

.session-details {
  margin-top: 3rem;
}

.session-details .session {
  margin-bottom: 2rem;
}
.session-details .session .title {
  font-weight: 500;
}
.session-details .title a {
  color: var(--accent-color);
}
.session-details .session .author {
  font-style: italic;
}
.session-details .session .abstract {
  margin-bottom: 4rem;
  margin-top: 0.8rem;
  padding-left: 2rem;
}
.session-details .session p {
  margin-block-start: 0.7rem;
}
.session-details .session ol {
  padding-left: 3rem;
}
.session {
  border-bottom: 2px solid #7e8b9e;
}

.closed {
  text-decoration: line-through;
}

.material {
  display: flex;
  gap: 2rem;
  margin: 1.7rem 0rem;
}
.video:before {
  background: url(youtube.svg);
  background-position: 0rem 0.9rem;
  background-repeat: no-repeat;
  content: " ";
  display: inline-block;
  height: 2rem;
  width: 2.3rem;
}
.slides:before {
  background: url(download.svg);
  background-position: 0rem 0.7rem;
  background-repeat: no-repeat;
  content: " ";
  display: inline-block;
  height: 2rem;
  width: 2.1rem;
}
.slides {
  margin-right: 2rem;
}
.video:hover:before,
.slides:hover:before {
  filter: brightness(0) saturate(100%) invert(44%) sepia(83%) saturate(3430%)
    hue-rotate(3deg) brightness(103%) contrast(103%);
}