:root {
  --rpx-vw: 100vw / 1920;
  --rpx-vh: 100vh / 1080;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Satoshi', sans-serif;
  font-size: calc(42 * var(--rpx-vw));
}

body {
  font-family: 'Satoshi', sans-serif;
  user-select: none;
  overflow-x: hidden;
  background-color: #2f2f2f;
  color: #fbfbf0;
  transition: background-color 0.5s, color 0.5s;
  width:100%;
  margin: 0;
}
main {
  padding:0 2rem;
}
.dark-mode {
  background-color: #2f2f2f;
  color: #f6f6dc;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  z-index:12;
  position: -webkit-sticky;
  position: sticky;
  top:1rem;
}

.top-bar a {
  font-weight: bold;
  text-transform: uppercase;
  text-decoration: none;
  color: inherit;
  margin-right: calc(15 * var(--rpx-vw));
}

.top-bar button {
  font-weight: bold;
  text-transform: uppercase;
  cursor: pointer;
  padding: 0.5rem 1rem;
  border: none;
  background-color: #2f2f2f;
  color: #f6f6dc;
  border-radius: 4px;
}

.header {
  text-align: center;
  margin: 0 auto;
  max-width: 1200px;
}

.header h1 {
  font-family: 'Clash Grotesk', sans-serif;
  font-weight: 700;
  font-size: calc(58 * var(--rpx-vw));
  margin-bottom: calc(15 * var(--rpx-vw));
}
.introduce ul li{
  margin-bottom: calc(10 * var(--rpx-vw));
}
.nav-bar ul {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 0;
}

.nav-bar li {
  margin: 0 1rem;
}

.nav-bar a {
  text-decoration: none;
  color: inherit;
  font-size: calc(42 * var(--rpx-vw));
}
.title-section, .subtitle-section {
  position: relative;
}
.main-section {
  padding:  2rem;
  padding-top:10rem;
  text-align: center;
  height:100%;
  margin-bottom: calc(50 * var(--rpx-vw));
  /*
  */
}

.main-section h2 {
  font-family: 'Clash Grotesk', sans-serif;
  font-weight: calc(300 * var(--rpx-vw));
  font-size: calc(54 * var(--rpx-vw));
  margin-bottom: calc(4 * var(--rpx-vw));
}

.main-section p {
  font-weight: calc(300 * var(--rpx-vw));
  font-size: calc(42 * var(--rpx-vw));
  margin-bottom: calc(34 * var(--rpx-vw));
}

h3{
  font-size: calc(49 * var(--rpx-vw));
}

.menu-toggle {
  display: none;
}

.dark-mode .top-bar button {
  background-color: #444;
}

  .menu-toggle:checked+.nav-bar {
    display: flex;
    flex-direction: column;
    align-items: center;
  }


.toggle-button-cover {
  display: table-cell;
  position: relative;
  box-sizing: border-box;
  transform:scale(0.45);
  transform-origin:center right;
}

.knobs,
.layer {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.button {
  position: relative;
  top: 50%;
  width: 74px;
  height: 36px;
  margin: calc(-15 * var(--rpx-vw)) auto 0 auto;
  overflow: hidden;
}

.button.r,
.button.r .layer {
  border-radius: 100px;
}

.button.b2 {
  border-radius: 2px;
}

.checkbox {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 3;
}

.knobs {
  z-index: 2;
}

.layer {
  width: 100%;
  background-color: #f6f6dc;
  transition: 0.3s ease all;
  z-index: 1;
}
#toggle-button .knobs:before {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 20px;
  height: 10px;
  color: #fff;
  font-size: calc(40 * var(--rpx-vw));
  font-weight: bold;
  text-align: center;
  line-height: 1;
  padding: 9px 4px;
  background-color: #2f2f2f;
  border-radius: 50%;
  transition: 0.3s ease all, left 0.3s cubic-bezier(0.18, 0.89, 0.35, 1.15);
}

#toggle-button .checkbox:active + .knobs:before {
  width: 46px;
  border-radius: 100px;
}

#toggle-button .checkbox:checked:active + .knobs:before {
  margin-left: calc(-42 * var(--rpx-vw));
}

#toggle-button .checkbox:checked + .knobs:before {
  content: "";
  left: 42px;
  background-color: #2f2f2f;
}

#toggle-button .checkbox:checked ~ .layer {
  background-color: #fcebeb;
}
.introduce{
  display: inline-block;
}
.myImg > img{
  width: calc(280 * var(--rpx-vw));
  height: calc(320 * var(--rpx-vw));
}

.stack_img{
  width: calc(80 * var(--rpx-vw));
  height: calc(80 * var(--rpx-vw));;
}

.projects-list{
  margin-right: auto;
  margin-left: auto;
  width: 70%;
}
.main-section > .studies_list .project p{
  display: none;
}

.main-section > .studies_list .project:hover p{
  display: block;
  color: #999999;
}

i {
  font-size: calc(42 * var(--rpx-vw));
}

img{
  display: inline-block;
}

.form__group {
  position: relative;
  padding: 20px 0 0;
  width: calc(600 * var(--rpx-vw));
}

.form__field {
  font-family: inherit;
  width: 100%;
  border: none;
  border-bottom: 2px solid #9b9b9b;
  outline: 0;
  font-size: calc(32 * var(--rpx-vw));
  color: #fff;
  padding: 7px 0;
  background: transparent;
  transition: border-color 0.2s;
}

.form__field::placeholder {
  color: transparent;
}

.form__field:placeholder-shown ~ .form__label {
  font-size: calc(19 * var(--rpx-vw));
  cursor: text;
  top: 20px;
}

.form__label {
  position: absolute;
  top: 0;
  display: block;
  transition: 0.2s;
  font-size: calc(22 * var(--rpx-vw));
  color: #9b9b9b;
  pointer-events: none;
}

.form__field:focus {
  padding-bottom: 6px;
  font-weight: 700;
  border-width: 3px;
  border-image: linear-gradient(to right, #116399, #38caef);
  border-image-slice: 1;
}

.form__field:focus ~ .form__label {
  position: absolute;
  top: 0;
  display: block;
  transition: 0.2s;
  font-size: calc(19 * var(--rpx-vw));
  color: #38caef;
  font-weight: 700;
}

/* reset input */
.form__field:required, .form__field:invalid {
  box-shadow: none;
}
button {
  align-items: center;
  background-color: transparent;
  color: #fff;
  cursor: pointer;
  font-family: ui-sans-serif,system-ui,-apple-system,system-ui,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";
  font-size: calc(40 * var(--rpx-vw));
  font-weight: 700;
  line-height: 1.5;
  text-decoration: none;
  text-transform: uppercase;
  outline: 0;
  border: 0;
  padding: 1rem;
}

button:before {
  background-color: rgb(213, 39, 39);
  content: "";
  display: inline-block;
  height: 1px;
  margin-right: calc(42 * var(--rpx-vw));
  transition: all .42s cubic-bezier(.25,.8,.25,1);
  width: 0;
}

button:hover:before {
  background-color: #fff;
  width: 3rem;
}