:root {
  --nav_height: 50px;
  --font-size_nav_menu: 1.1em;
  --font-size_nav_logo: 2em;
  --font-size-home: 2em;
  --font_size_intro_text: 2em;
  /* Color */
  --color-white: #ffffff;
  --color-light-white: #eeeeee;
  --color-dark-white: #bdbdbd;
  --color-pink: #fe918d;
  --color-dark-pink: #ff6863;
  --color-black: #4d4d4d;
  --color-dark-grey: #4d4d4d;
  --color-grey: #616161;
  --color-light-grey: #7c7979;
  --color-blue: #73aace;
  --color-yellow: #fff7d1;
  --color-orange: #feb546;
  --color-black: #000000;
}

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

a {
  text-decoration: none;
  color: #666;
}

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

img {
  vertical-align: bottom;
}

section {
  overflow: hidden;
}

.title {
  font-family: "Lexend Peta", sans-serif;
}

/* nav */
nav#nav_bar {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: fixed;
  overflow: hidden;
  padding: 10px 0;
  font-size: var(--font-size_nav_menu);
  background: transparent;
  transition: all 0.4s;
  z-index: 999;
}
#nav_bar.nav_bar_top {
  background:/*#EEF8EF*/ #f6f7f9;
  padding: 10px;
}
.nav_logo {
  cursor: pointer;
  width: 150px;
  text-align: center;
  font-size: var(--font-size_nav_logo);
  font-family: "Open Sans", sans-serif;
  font-weight: bold;
  line-height: var(--nav_height);
}

.nav_box {
  display: block;
  overflow: hidden;
  margin-right: 50px;
  width: 50%;
}

.nav_menu {
  float: left;
  padding: 10px 0;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 10px;
  width: 25%;
  text-align: center;
  color: #333;
  font-family: "Lexend Exa", sans-serif;
}

.nav_menu > span {
  position: relative;
  pointer-events: none;
  font-weight: bold;
}

.nav_menu:hover span,
.nav_menu.active span {
  font-weight: bold;
}

.nav_menu:hover span::after,
.nav_menu.active span::after {
  content: "";
  position: absolute;
  left: -5%;
  bottom: -3px;
  width: 110%;
  background: #000;
  height: 2px;
  display: block;
}

/* HOME */
#home {
  height: 100vh;
  width: 100%;
  display: flex;
  align-content: center;
  align-items: center;
  background: url(img/home_background.png);
  background-size: cover;
  padding: 0;
}

.home_box {
  width: 100%;
}

.face {
  width: 25%;
  text-align: center;
  margin: 0 auto;
}

.face img {
  width: 100%;
  display: block;
}

.home_text {
  font-family: "S-CoreDream-5Medium";
  font-weight: normal;
  margin-top: 20px;
  text-align: center;
  font-size: var(--font-size-home);
}

/* ABOUT */
#about {
  width: 100%;
  line-height: 2.4em;
  position: relative;
  padding: 5% 0;
}

.about_wrap {
  width: 80%;
  margin: 0 auto;
  overflow: hidden;
}

#about_self {
  font-size: 2.7em;
  width: 100%;
}

.about_right_box {
  overflow: hidden;
  float: right;
  width: 50%;
  margin: 7% 0;
}

.about_skill {
  font-size: 2.7em;
  margin-bottom: 50px;
}

.about_left {
  width: 50%;
  float: left;
  font-size: 1.45em;
  margin: 7% 0;
}

.about_left_intro {
  line-height: var(--font_size_intro_text);
}

.about_left_info {
  margin-top: 80px;
}

.about_left_info_box {
  width: 90%;
  display: flex;
  padding: 70px 0;
  border-top: 1px solid #333;
}

.about_left_info > div > p {
  flex: 1;
}

.about_left_info > div > ul {
  flex: 1.9;
}

.about_left_info_box > p {
  color: #003458;
  font-weight: bold;
  font-size: 1.1em;
}

.about_left_info_box span {
  margin-right: 20px;
}

.skill_box {
  width: 90%;
  float: left;
}

.skill_box > div {
  width: 100%;
  margin-bottom: 40px;
  font-size: 1.5em;
}

.skill_box > div > p {
  margin-bottom: 10px;
  font-family: "Lexend Peta", sans-serif;
  color: #333;
}

.skill_box > div span {
  display: block;
  border-radius: 999px;
  width: 100%;
  background: var(--color-light-white);
  height: 20px;
}

.skill_box > div span > span {
  background: var(--color-orange);
  width: 0;
  transition-timing-function: ease-out;
}

.skill_text {
  width: 40%;
  font-size: 1.6em;
  padding-top: 40px;
  line-height: 1.9em;
  float: left;
}
.skill_per.html {
  width: 75%;
}
.skill_per.css {
  width: 77%;
}

.skill_per.js {
  width: 65%;
}

.skill_per.react {
  width: 50%;
}

/* WORK */
#work {
  background: #f6f7f9;
  padding: 6% 10%;
}

#work_title {
  font-size: 4em;
  text-align: left;
  color: #000;
  width: 100%;
  margin: 0 auto;
  text-align: center;
  margin-bottom: 50px;
}

#work_title > span {
  display: block;
  font-size: 0.7em;
  color: var(--color-dark-grey);
}

#position_box {
  overflow: hidden;
  width: 90%;
  margin: auto;
}

.work_box {
  position: relative;
  width: 45%;
  font-size: 1.5em;
  margin: 40px 2.5%;
  overflow: hidden;
  float: left;
}

.work_background {
  padding-top: 50%;
}

.img_box {
  width: 100%;
}

.img_box img {
  width: 100%;
  opacity: 1;
}

.work_box:hover .work_background {
  opacity: 0.2;
}

.work_text {
  position: absolute;
  top: 18%;
  left: 10%;
  font-family: "S-CoreDream-8Heavy", sans-serif;
  opacity: 0;
}

.work_box:hover .work_text {
  opacity: 1;
}

.work_box.right .work_text {
  left: 15%;
}

.work_text {
  color: #222;
}

.work_text p {
  font-size: 0.8em;
  color: #000;
  margin-bottom: 10px;
  letter-spacing: 0.05em;
}

p.work_time {
  color: #333;
}
.work_text a {
  display: inline-block;
  color: #000;
  border-radius: 111111px;
  overflow: hidden;
  font-size: 0.7em;
  letter-spacing: 0em;
}
.work_text a span {
  display: block;
  width: 100%;
  border-radius: 999px;
  padding: 5px 15px;
}

.work_text a span > span {
  background: powderblue;
  width: 10%;
  transition: all 0.7s;
  margin-top: 3px;
}
.work_text a:hover span {
  width: 100%;
}

/* CONTACT */
#contact {
  width: 100%;
  height: 100vh;
  position: relative;
}

.contact_box {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
}

.contact_box > div {
  width: 65%;
  margin: 0 auto;
  padding-top: 5%;
}

#contact_title {
  width: 100%;
  font-size: 3.5em;
  position: absolute;
  left: 0;
  text-align: center;
  top: 17%;
  color: #333;
}

.contact_text {
  float: left;
  width: 47.5%;
  margin-right: 1.25%;
  font-size: 1.5em;
}

.contact_text span {
  display: block;
  font-size: 2em;
  margin-bottom: 10px;
}

.adress {
  float: right;
  width: 40%;
  margin-left: 1.25%;
  font-size: 2.3em;
  line-height: 1.5em;
}

.adress > div:first-child {
  margin-bottom: 5%;
}

.end {
  width: 100%;
  text-align: center;
  left: 0;
  color: #666;
  position: absolute;
  bottom: 150px;
}

/* 스크롤바 커스텀 */
/* width */
::-webkit-scrollbar {
  width: 10px;
}

/* Track */
::-webkit-scrollbar-track {
  background: #f6f7f9;
}

/* Handle */
::-webkit-scrollbar-thumb {
  background: var(--color-blue);
}

/* Handle on hover */

@media screen and (max-width: 1600px) {
  /* nav */

  /* HOME */

  .home_box {
    width: 100%;
    margin: 0 auto;
    padding-top: 50px;
    font-size: 0.85em;
  }

  /* ABOUT */

  .about_wrap {
    font-size: 0.7em;
  }
  /* WORK */
  #work {
    background: #f6f7f9;
    padding: 6.5% 10%;
    display: flex;
    flex-direction: column;
    position: relative;
  }

  .work_box {
    font-size: 0.7em;
  }

  #work_title {
    font-size: 3em;
    margin-bottom: 40px;
  }

  .work_text {
    font-size: 1.6em;
    color: #444;
  }

  /* CONTACT */
  #contact {
    height: 100vh;
    padding: 4% 0;
    padding-bottom: 0;
    overflow: hidden;
  }

  .contact_text {
    font-size: 1.2em;
  }

  .adress {
    font-size: 2em;
  }
  .contact_box {
    position: relative;
    display: block;
  }

  #contact_title {
    position: relative;
    top: 0;
    left: 0;
  }
  .contact_text {
    width: 100%;
    font-size: 1.4em;
    margin: 0;
    text-align: center;
    margin: 5% 0;
  }

  .contact_box > div {
    width: 100%;
  }

  .adress {
    width: 100%;
    font-size: 2em;
    margin: 0;
    overflow: hidden;
  }

  .adress > div {
    float: left;
    width: 40%;
    margin: 0 5%;
    text-align: center;
  }

  .adress > div:last-child {
    float: left;
  }

  .end {
  }
}

@media screen and (max-width: 1024px) {
  /* nav */
  .nav_box {
    width: 100%;
    margin: 0;
    font-size: 1.2em;
  }

  .nav_logo {
    display: none;
  }

  .nav_menu.active {
    font-weight: bold;
  }

  .nav_menu:hover span::after {
    display: none;
  }

  .nav_menu.active span::after {
    display: block;
  }

  /* HOME */

  #home {
    height: auto;
  }

  .home_box {
    width: 70%;
    margin: 100px auto;
    padding: 0;
    font-size: 1.1em;
  }

  .home_box .face {
    width: 50%;
  }

  /* ABOUT */
  #about {
    padding-top: 10%;
  }

  .about_wrap {
    font-size: 0.5em;
  }

  /* SKILL */
  #skill {
    padding: 10% 10%;
  }

  #skill_title {
    font-size: 3.3em;
    margin-top: 30px;
    margin-bottom: 20px;
    text-align: center;
  }

  .skill_box {
    width: 100%;
    margin: 0;
  }

  .skill_box > div {
    width: 100%;
    margin-bottom: 20px;
    font-size: 1.1em;
  }

  .skill_box > div span {
    height: 15px;
  }

  .skill_text {
    width: 100%;
    font-size: 1.5em;
    margin-bottom: 30px;
  }

  /* WORK */
  #work {
    background: #f6f7f9;
    padding: 12% 10%;
    display: flex;
    flex-direction: column;
    position: relative;
  }

  .img_box {
    width: 100%;
    margin: 0 auto;
    margin-bottom: 15px;
  }

  #work_title {
    font-size: 4em;
    margin-bottom: 40px;
  }
  #position_box {
    width: 80%;
  }

  .work_box {
    width: 100%;
    display: flex;
    flex-direction: column;
  }
  .work_text {
    position: static;
    text-align: center;
    opacity: 1;
  }

  .work_text {
    font-size: 2em;
    color: #444;
  }

  .work_text a span > span {
    width: 100%;
  }
  .work_box:hover img {
    opacity: 1;
  }
  /* CONTACT */

  #contact {
    padding: 10% 0;
    height: 100vh;
  }

  .contact_box {
    position: relative;
    display: block;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  #contact_title {
    position: relative;
    top: 0;
    left: 0;
    margin-bottom: 5%;
  }
  .contact_text {
    width: 100%;
    font-size: 1.7em;
    margin: 0;
    text-align: center;
    margin: 15% 0;
  }

  .contact_box > div {
    width: 100%;
  }

  .adress {
    width: 100%;
    font-size: 2.5em;
    margin: 0;
    overflow: hidden;
  }

  .adress > div {
    float: left;
    width: 40%;
    margin: 0 5%;
    text-align: center;
  }

  .adress > div:last-child {
    float: left;
  }

  .end {
    bottom: 60px;
  }
}

@media screen and (max-width: 768px) {
  /* nav */
  .nav_box {
    width: 100%;
    margin: 0;
    font-size: 1em;
    padding: 0;
  }

  .nav_logo {
    display: none;
  }

  .nav_menu.active {
    font-weight: bold;
  }

  .nav_menu:hover span::after {
    display: none;
  }

  .nav_menu.active span::after {
    display: block;
  }

  /* HOME */

  .home_box {
    width: 70%;
    margin: 100px auto;
    padding: 0;
    font-size: 0.7em;
  }

  .home_box .face {
    width: 60%;
  }

  /* ABOUT */
  #about {
    padding: 0;
    padding-top: 10%;
  }

  #about_self.fixed,
  #about_self {
    position: static;
    transform: translateY(0);
  }

  .about_wrap {
    padding-bottom: 150px;
  }

  .about_wrap > div {
    width: 100%;
  }

  .about_left {
    width: 100%;
    font-size: 1.3em;
  }

  .about_left_info > div > p {
    flex: 1.3;
    font-size: 2em;
  }

  .about_left_info > div > ul {
    flex: 2;
    font-size: 1.7em;
  }

  #skill_title {
    font-size: 3em;
  }

  .skill_box {
    width: 100%;
    margin: 0;
  }

  .skill_box > div {
    width: 100%;
    margin-bottom: 50px;
    font-size: 2.3em;
  }

  .skill_box > div span {
    height: 15px;
  }

  /* WORK */
  #work {
    background: #f6f7f9;
    display: flex;
    flex-direction: column;
    position: relative;
  }

  .img_box {
    width: 100%;
  }

  .work_text {
    font-size: 1.7em;
    color: #444;
  }

  .work_text a span {
    padding: 4px 15px;
  }

  /* CONTACT */
  .contact_text {
    margin: 10% auto;
    font-size: 1.3em;
  }

  .adress {
    width: 100%;
    font-size: 2em;
    margin: 0;
    overflow: hidden;
  }

  .adress > div {
    float: left;
    width: 40%;
    margin: 0 5%;
    text-align: center;
  }
}

@media screen and (max-width: 500px) {
  /* nav */
  .nav_box {
    width: 100%;
    margin: 0;
    font-size: 0.5em;
    padding: 0;
  }

  .nav_logo {
    display: none;
  }

  .nav_menu.active {
    font-weight: bold;
  }

  .nav_menu:hover span::after {
    display: none;
  }

  .nav_menu.active span::after {
    display: block;
  }

  /* HOME */

  .home_box {
    width: 50%;
    margin: 70px auto;
    padding: 0;
    font-size: 0.4em;
  }

  .home_box .face {
    width: 60%;
  }

  /* ABOUT */
  #about {
    padding: 0;
    padding-top: 10%;
  }

  .about_wrap {
    padding-bottom: 0;
    font-size: 0.4em;
  }
  .about_left {
    width: 100%;
    font-size: 1em;
  }

  .about_left_info_box {
    padding: 10px 0;
    font-size: 0.95em;
  }

  .about_left_info > div > p {
    flex: 1;
  }

  .about_left_info > div > ul {
    flex: 2;
  }

  .skill_box {
    font-size: 0.78em;
  }

  .skill_box > div span {
    height: 8px;
  }
  /* WORK */
  #work {
    height: auto;
  }

  #work_title {
    font-size: 2em;
    padding-top: 50px;
  }

  .img_box {
    width: 100%;
  }

  .work_text {
    font-size: 0.9em;
  }

  .work_text a span {
    padding: 2px 15px;
  }

  /* CONTACT */
  #contact_title {
    font-size: 2.7em;
    position: absolute;
    top: 60px;
  }

  .contact_text {
    margin: 10% auto;
    font-size: 0.95em;
  }

  .adress {
    width: 80%;
    font-size: 1.3em;
    margin: 0 auto;
    overflow: hidden;
  }

  .adress > div {
    width: 100%;
    margin: 0 auto;
    text-align: left;
  }
}