* {
  padding: 0%;
  margin: 0%;
}

:root {
  --primary: #d3d3d3;
  --header: #ec5242;
  --footer: #272a31;
}

body {
  font-family: 'Lato', sans-serif;
}

h1 {
  font-size: 4em;
  color: var(--header);
}

ul {
  padding-inline-start: 0%;
}

li {
  list-style: none;
}

a {
  text-decoration: none;
}

p {
  color: var(--footer);
}

/***** Popup Menu *****/

#popup-menu {
  height: 100vh;
  background-color: #ec5342bf;
  padding: 3em;
  position: absolute;
  left: -110%;
  width: 50%;
  backdrop-filter: blur(4px);
  transition: 0.5s;
}

#close-btn {
  float: right;
  color: white;
}

#menu-list {
  width: 60%;
  margin: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1em;
  position: relative;
  top: 10%;
}

#menu-list .list a {
  color: white;
  font-size: 2em;
}

/***** Navigation *****/

header {
  height: 4em;
  position: absolute;
  width: 100%;
  z-index: 10;
}

nav {
  padding: 1em 1.5em;
}

#hamburger {
  display: flex;
}

#hamburger i {
  color: var(--footer);
  font-size: 3em;
}

/***** Headline *****/

#headline {
  background-image: url('	https://summit.cckorea.org/images/base/mobile_intro_bg.png');
  background-size: cover;
  background-repeat: no-repeat;
  position: relative;
  height: 110vh;
}

.headline-container {
  position: absolute;
  width: 100%;
  height: 100%;
}

.text-container {
  width: 90%;
  display: flex;
  flex-direction: column;
  margin: auto;
  padding-top: 9em;
}

.welcome {
  color: var(--header);
  font-size: 1.5em;
}

.h1_1 {
  letter-spacing: 0.06em;
  font-size: 2em;
}

.h1_2 {
  position: relative;
  top: -0.4em;
  letter-spacing: 0.08em;
}

.description {
  margin-top: 0.5em;
  padding: 1em;
  border: solid 4px white;
  word-spacing: 0.1em;
}

.quote {
  word-spacing: 0.1em;
  margin-top: 3em;
  font-style: italic;
}

/***** Courses *****/

#courses {
  height: 110vh;
  background-image: url('	https://summit.cckorea.org/images/base/pattern_bg.png');
  position: relative;
}

.courses-main-container {
  background-color: #272a31ee;
  position: absolute;
  width: 100%;
  height: 100%;
}

.courses-container {
  display: flex;
  flex-direction: column;
  gap: 1em;
}

.course-row {
  gap: 1em;
  display: flex;
  flex-direction: column;
}

#course {
  display: flex;
  background-color: #7b7e8474;
  align-items: center;
  width: 95%;
  margin: auto;
}

.courses-header {
  color: white;
  width: 4em;
  padding: 1em 0;
  font-size: 2em;
  margin: auto;
  position: relative;
}

.courses-header::after {
  content: '';
  width: 2em;
  left: 20%;
  margin: auto;
  position: absolute;
  bottom: 0.6em;
  height: 0.1em;
  background-color: var(--header);
}

.col-1 {
  width: 25%;
}

.col-2 {
  width: 30%;
}

.col-3 {
  width: 55%;
}

.course-img {
  width: 3em;
  display: flex;
  margin: auto;
}

.c2-text {
  color: var(--header);
  padding: 0.5em;
  font-weight: 600;
}

.c3-text {
  color: white;
  padding: 0.5em;
  font-size: 1em;
  letter-spacing: 0.1em;
}

.course-btn {
  width: 80%;
  margin: auto;
  position: relative;
  top: 1.5em;
  border: none;
  font-size: 1em;
  padding: 1em 2em;
  background-color: #ec5242;
  color: white;
}

.whole-program {
  display: none;
}

/***** Features *****/
#features {
  padding: 2em 0.5em;
  display: flex;
  flex-direction: column;
  gap: 2em;
  margin-bottom: 3em;
}

.features-header {
  width: 9em;
  margin: 0 auto 2em auto;
  position: relative;
}

.features-header::after {
  content: '';
  width: 2em;
  left: 40%;
  bottom: -0.5em;
  margin: auto;
  position: absolute;
  height: 0.09em;
  background-color: var(--header);
}

.lecturer {
  display: flex;
  gap: 1em;
}

#feature-container {
  display: flex;
  flex-direction: column;
  gap: 1em;
}

#feature-col1,
#feature-col2 {
  display: flex;
  flex-direction: column;
  gap: 2em;
}

@media screen and (min-width: 500px) and (max-width: 767px) {
  #feature-col1,
  #feature-col2 {
    gap: 5em;
  }

  #feature-container {
    gap: 5em;
  }
}

.lecturer-name {
  font-weight: bold;
  color: black;
}

.lecturer-position {
  color: var(--header);
  font-size: 0.85em;
  position: relative;
}

.inactive {
  display: none;
}

.pos {
  position: relative;
  margin-bottom: 0.5em;
}

.pos::after {
  content: '';
  width: 2em;
  bottom: -0.2em;
  margin: auto;
  position: absolute;
  height: 0.09em;
  background-color: var(--header);
}

.lecturer-work {
  font-size: 0.85em;
}

.lecturer-col1 {
  width: 9em;
  position: relative;
}

.lecturer-col1 img {
  position: absolute;
  width: 100%;
}

.lecturer-col2 {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
}

.show-more {
  border: solid 1px black;
  background-color: transparent;
  font-size: 1em;
  padding: 0.5em;
}

/***** Partners *****/

#partners {
  background-color: var(--footer);
  padding: 2em 1em;
}

.partners-header {
  text-align: center;
  color: white;
  position: relative;
  margin-bottom: 2em;
  font-weight: 400;
}

.partners-header::after {
  content: '';
  width: 2em;
  left: 45%;
  margin: auto;
  position: absolute;
  bottom: -0.8em;
  height: 0.1em;
  background-color: var(--header);
}

.sponsors1 {
  display: flex;
  align-items: center;
  width: fit-content;
  margin: 0 auto 1em auto;
  gap: 1em;
}

.desktop-partner {
  display: none;
}

.sponsors2 {
  display: flex;
  align-items: center;
  width: fit-content;
  margin: auto;
}

#footer {
  display: flex;
  padding: 1em;
  align-items: center;
  justify-content: space-between;
}

.footer-logo {
  width: 25%;
}

.logo2 {
  width: 100%;
}

/***** none *****/

#nav-container {
  display: none;
}

@media screen and (min-width: 768px) {
  #popup-menu {
    display: none;
  }

  #hamburger {
    display: none;
  }

  /***** Navigation *****/

  #nav-container {
    display: block;
  }

  #top-bar {
    background-color: var(--footer);
    width: 100%;
  }

  .handle1 {
    width: 7px;
    position: relative;
    top: 4px;
  }

  .handle2 {
    width: 12px;
    top: 3px;
    position: relative;
  }

  .top-bar-lists {
    display: flex;
    gap: 1em;
    justify-content: flex-end;
    padding: 0.1em;
    position: relative;
    bottom: 0.2em;
    width: 80%;
    margin: auto;
  }

  .top-bar-list a {
    color: white;
    font-size: 0.8em;
  }

  .nav-bar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 80%;
    margin: auto;
  }

  #desktop-logo {
    width: 3em;
  }

  #nav-lists {
    display: flex;
    gap: 1.5em;
  }

  .campaign {
    padding: 0 0.2em;
    display: flex;
    border: 2px solid var(--header);
  }

  .nav-list a {
    font-size: 1em;
    transition: 0.5s;
    color: var(--footer);
  }

  .nav-list a:hover {
    color: var(--header);
  }

  .campaign-txt {
    color: var(--header);
  }

  nav {
    padding: 0%;
    box-shadow: 0.7px 0.7px 1px white;
    background-color: white;
  }

  /***** Desktop Headline Section *****/

  #headline {
    width: 100%;
    background-image: url('https://summit.cckorea.org/images/base/main_big.png');
    background-size: cover;
    background-position: 0% 3em;
    height: 110vh;
  }

  .text-container {
    position: relative;
    width: 70%;
    top: 2em;
  }

  .welcome {
    margin-bottom: 0;
    font-size: 1.5em;
  }

  .main-header {
    display: flex;
    align-items: center;
  }

  .h1_1,
  .h1_2 {
    position: relative;
    top: -0.2em;
    font-size: 3em;
    font-weight: 900;
  }

  .description {
    font-size: 0.8em;
    width: 70%;
    border: 2px solid white;
    background-color: #f7f3f3;
  }

  /***** Desktop Courses *****/

  #courses {
    background-size: 3%;
    height: 80vh;
    margin-bottom: 3em;
  }

  .courses-container {
    background-color: #272a31c6;
    height: 80vh;
  }

  .courses-header {
    font-size: 1.5em;
    margin: 0 auto 0 auto;
    text-align: center;
  }

  .course-row {
    width: 90%;
    margin: 0 auto 0 auto;
    display: flex;
    flex-direction: row;
    gap: 0.2em;
  }

  #course {
    flex-direction: column;
    align-items: center;
    height: 30vh;
    justify-content: center;
    padding: 1em 0;
  }

  #course:hover {
    border: solid 1.5px white;
  }

  .col-1,
  .col-2,
  .col-3 {
    width: 90%;
  }

  .c2-text {
    font-size: 1.4em;
    text-align: center;
  }

  .c3-text {
    text-align: center;
    font-size: 0.9em;
  }

  .course-btn {
    display: none;
  }

  .whole-program {
    text-decoration: underline;
    color: white;
    transition: 0.5s;
    display: block;
    width: 50%;
    text-align: center;
    margin: 1em auto 4em auto;
    font-size: 1.5em;
  }

  .whole-program:hover {
    color: var(--header);
  }

  /***** Features *****/

  .inactive {
    display: block;
  }

  #feature-container {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    width: 80%;
    margin: auto;
    height: 80vh;
  }

  #feature-col1,
  #feature-col2 {
    display: flex;
    flex-direction: column;
    gap: 4em;
  }

  .lecturer {
    display: flex;
    gap: 0.8em;
  }

  .lecturer-name {
    font-weight: bold;
    color: black;
    font-size: 1.2em;
  }

  .lecturer-position {
    color: var(--header);
    font-size: 0.9em;
    position: relative;
  }

  .lecturer-work {
    font-size: 0.9em;
  }

  .show-more {
    display: none;
  }

  /***** Partner *****/

  .sponsors {
    display: none;
  }

  #partners {
    margin-top: 2em;
  }

  .desktop-partner {
    width: fit-content;
    margin: auto;
    display: block;
  }

  .partners-header {
    font-size: 1.5em;
    color: var(--primary);
  }

  .partners-header::after {
    left: 47%;
  }

  /***** footer *****/

  #footer {
    background-color: var(--primary);
    padding: 1em 4em;
    justify-content: center;
  }

  .logo2 {
    width: 30%;
  }
}

@media screen and (min-width: 768px) and (max-width: 770px) {
  #headline {
    height: 80vh;
  }

  #courses {
    height: 50vh;
  }

  .courses-container {
    height: 40vh;
  }

  .whole-program {
    width: 30%;
    text-align: center;
  }
}

@media screen and (min-width: 801px) and (max-width: 822px) {
  #headline {
    height: 100vh;
  }

  #courses {
    height: 70vh;
  }

  .courses-container {
    height: 70vh;
  }

  .whole-program {
    width: 30%;
    text-align: center;
  }
}

@media screen and (min-width: 1035px) {
  #feature-col1,
  #feature-col2 {
    gap: 5em;
  }

  #feature-container {
    height: 70vh;
  }

  .partners-header::after {
    left: 48%;
  }
}

@media screen and (min-width: 1150px) and (max-width: 1350px) {
  #features {
    height: 90vh;
  }

  #feature-col1,
  #feature-col2 {
    gap: 7em;
  }
}

@media screen and (min-width: 1351px) {
  /***** Navigation *****/

  #top-bar {
    background-color: var(--footer);
    width: 100%;
    height: 2.5em;
    display: flex;
    align-items: center;
  }

  .handle1 {
    width: 10px;
    position: relative;
  }

  .handle2 {
    width: 15px;
    position: relative;
  }

  .top-bar-lists {
    display: flex;
    gap: 1em;
    justify-content: flex-end;
    align-items: center;
    position: relative;
    bottom: 0;
    width: 80%;
    margin: auto;
  }

  .top-bar-list a {
    color: white;
    font-size: 0.9em;
  }

  .nav-bar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 80%;
    margin: auto;
  }

  #desktop-logo {
    width: 4em;
  }

  #nav-lists {
    display: flex;
    gap: 4em;
  }

  .nav-list a {
    font-size: 1.2em;
    transition: 0.5s;
    color: var(--footer);
  }

  /***** Desktop Headline Section *****/

  #headline {
    width: 100%;
    background-image: url('https://summit.cckorea.org/images/base/main_big.png');
    background-size: cover;
    background-position: 0% 3em;
    height: 110vh;
  }

  .text-container {
    position: relative;
    width: 70%;
    top: 8em;
  }

  .welcome {
    margin-bottom: 0;
    font-size: 2.5em;
  }

  .main-header {
    display: flex;
    align-items: center;
  }

  .h1_1,
  .h1_2 {
    position: relative;
    top: -0.2em;
    font-size: 5em;
    font-weight: 900;
  }

  .description {
    font-size: 1.2em;
    width: 60%;
    border: 4px solid white;
    background-color: #f7f3f3;
  }

  .quote {
    font-size: 1.2em;
  }

  #features {
    height: 100vh;
  }

  #feature-col1,
  #feature-col2 {
    gap: 7em;
  }

  .desktop-partner {
    display: flex;
    gap: 3em;
  }

  .course-row {
    width: 80%;
  }

  .course-img {
    width: 5em;
  }

  .c2-text {
    font-size: 1em;
  }

  .c3-text {
    font-size: 1em;
  }

  .whole-program {
    font-size: 1.5em;
    width: 22%;
  }

  .lecturer-name {
    font-size: 1.2em;
  }

  .lecturer-position {
    font-size: 1em;
  }

  .lecturer-work {
    font-size: 1em;
  }

  #feature-container {
    gap: 5em;
  }
}