:root {
  --d: 700ms;
  --e: cubic-bezier(0.19, 1, 0.22, 1);
  --font-sans: "Rubik", sans-serif;
  --font-serif: "Cardo", serif;
}

body, html{
    height: 100%;
    margin: 0%;
}
.pimg1, .pimg2, .pimg3{
    position:relative;
    opacity:0.90;
    background-position:center;
    background-size:cover;
    background-repeat:no-repeat;
  
    /*
      fixed = parallax
      scroll = normal
    */
    background-attachment:fixed;
  }
.pimg1{
    background-image: url('3.jfif');
    min-height: 100%;
    max-width: 100%;
}
.pimg2{
  background-image: url('pimg2.jfif');
  min-height: 700px;
}
.pimg3{
  background-image: url('7.jfif');
  min-height: 500px;
}  
@media(max-width:568px){
    .pimg1, .pimg2, .pimg3{
      background-attachment:scroll;
      width: 100%;
    }
  }

header ,a, ul{
    display: flex;
    flex-direction: row;
    justify-content: center;
    list-style: none;
    text-decoration: none;
    color: #f4f4f4;
    opacity: 0.90;
    font-weight:unset;
    font-family: var(--font-sans);
}

@media (max-width: 980px) {
  html {
      font-size: 16px;
  }
}

@media (max-width: 768px) {
  html {
      font-size: 14px;
  }
}

@media (max-width: 480px) {
  html {
      font-size: 12px;
  }
}
@media (max-width: 480px) {
  .nav-list {
    font-size: 9px;
    padding: 0 0;
    margin: 0 0;
  }
}
a:hover{
    border: none;
    outline: none;
    border-radius: 10px;
    text-decoration: none;
    color:  rgb(6, 17, 27);
}
li{
    margin: 1rem;
}

.nav-list{
  display: flex;
}

.nav-list a{
  display: block;
  padding: 1em;
  text-transform: uppercase; 
}

.ptext{
    position:absolute;
    top: 50%;
    width: 100%;
    text-align: center;
    color: #000;
    letter-spacing: 5px;
    font-size: 30px;
    text-transform: uppercase;
}


/* .ptext .border.trans{
  background-color:transparent;
} */

.section{
    text-align:center;
    padding:3em 2em;
    width: 100%;
    height: fit-content;
}
  
.section-light{
   background-color:#f4f4f4;
   color:#666;
}
  
.section-dark{
   background-color:#282e34;
   color:#ddd;
}

.challenge-flex{
  width: 100%;
  max-width: 1024px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
  font-family: var(--font-sans);
}

@media (min-width: 600px) {
  .challenge-flex {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 800px) {
  .challenge-flex {
    grid-template-columns: repeat(4, 1fr);
  }
}

.challenge-tile{
  border-radius: 5px;
  display: flex;
  align-items: flex-end;
  flex-direction: row;
  position:relative;
  overflow: hidden;
  padding: 1rem;
  width: 100%;
  text-align: center;
  color: whitesmoke;
  background-color: rgb(105, 96, 96);
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1), 0 2px 2px rgba(0, 0, 0, 0.1), 0 4px 4px rgba(0, 0, 0, 0.1), 0 8px 8px rgba(0, 0, 0, 0.1), 0 16px 16px rgba(0, 0, 0, 0.1);
}

@media screen and (max-width: 700px){
  .challenge-tile{
    height: 350px;
  }
  .challenge-flex{
    display: flex;
    flex-wrap: wrap;
  }
}

.challenge-tile::before{
  content: "";
  position: absolute;  
  top: 0;
  left: 0;
  width: 100%;
  height: 110%;
  background-size: cover;
  background-position:  0 0;
  transition: transform calc(var(--d)*1.5) var(--e);
  pointer-events: none;
}
.challenge-tile::after{
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 200%;
  pointer-events: none;
  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.009) 11.7%, rgba(0, 0, 0, 0.034) 22.1%, rgba(0, 0, 0, 0.072) 31.2%, rgba(0, 0, 0, 0.123) 39.4%, rgba(0, 0, 0, 0.182) 46.6%, rgba(0, 0, 0, 0.249) 53.1%, rgba(0, 0, 0, 0.32) 58.9%, rgba(0, 0, 0, 0.394) 64.3%, rgba(0, 0, 0, 0.468) 69.3%, rgba(0, 0, 0, 0.54) 74.1%, rgba(0, 0, 0, 0.607) 78.8%, rgba(0, 0, 0, 0.668) 83.6%, rgba(0, 0, 0, 0.721) 88.7%, rgba(0, 0, 0, 0.762) 94.1%, rgba(0, 0, 0, 0.79) 100%);
  transform: translateY(-50%);
  transition: transform calc(var(--d)*2) var(--e);
}

.challenge-tile:nth-child(1){
  background-image: url('github\ search\ app.jpg');
}
.challenge-tile:nth-child(2){
  background-image: url('Tip\ calculator\ app.jpg');
}
.challenge-tile:nth-child(3){
  background-image: url('audiophile\ desktop.jpg');
}
.challenge-content{
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  object-fit: cover;
  border-radius: 5px 5px 0 0;
  padding: 1rem;
  transition: transform var(--d) var(--e);
  z-index: 1;
}

.challenge-content > * + * {
  margin-top: 1rem;
}

.title{
  font-size: 1.3rem;
  font-weight: bold;
  line-height: 1.2;
}

.copy {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-style: italic;
  line-height: 1.35;
}

.cardbtn {
  cursor: pointer;
  font-size: 0.65rem;
  font-weight: bold;
  letter-spacing: 0.025rem;
  text-transform: uppercase;
  color: white;
  background-color: black;
  border: none;
  outline: none;
  margin: 0 auto;
  padding: 1px 10px;
  width: auto;
  border-radius: 5px;
}
.cardbtn:hover {
  background-color: black;
}
.cardbtn:focus {
  outline: 1px dashed yellow;
  outline-offset: 3px;
}
.cardbtn2{
  border: none;
  outline: none;
  margin-bottom: 1.5rem;
  background-color: black;
  color: white;
}
@media (hover:hover) and (min-width: 600px){
  .challenge-tile{
    transform: translateY(0);
  }
  .challenge-content{
    transform: translateY(calc(100% - 4.5rem));
  }
  .challenge-content > *  :not(.title){
    /* opacity: 0; */
    transform: translateY(1rem);
    transition: transform var(--d) var(--e), opacity var(--d) var(--e);
  }


  .challenge-tile:hover,
.challenge-tile:focus-within {
    align-items: center;
  }
  .challenge-tile:hover:before,
.challenge-tile:focus-within:before {
    transform: translateY(-4%);
  }
  .challenge-tile:hover:after,
.challenge-tile:focus-within:after {
    transform: translateY(-50%);
  }
  .challenge-tile:hover .challenge-content,
.challenge-tile:focus-within .challenge-content {
    transform: translateY(0);
  }
  .challenge-tile:hover .challenge-content > *:not(.title),
.challenge-tile:focus-within .challenge-content > *:not(.title) {
    opacity: 1;
    transform: translateY(0);
    transition-delay: calc(var(--d) / 8);
  }

.challenge-tile:focus-within:before, .challenge-tile:focus-within:after,
.challenge-tile:focus-within .challenge-content,
.challenge-tile:focus-within .challenge-content > *:not(.title) {
    transition-duration: 0s;
  }
}

/* for carousel */
.carousel-style{
  display: flex;
  width: 70%;
  height: 50%;
  margin: 0 auto;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1), 0 2px 2px rgba(0, 0, 0, 0.1), 0 4px 4px rgba(0, 0, 0, 0.1), 0 8px 8px rgba(0, 0, 0, 0.1), 0 16px 16px rgba(0, 0, 0, 0.486);
}
/* .carousel-caption-style{
  position:absolute;
  text-align: center;
  color: #000;
  letter-spacing: 5px;
  font-size: 30px;
  text-transform: uppercase;  
} */
/* .carousel-caption-style{
  top: 80%;
  color: #000;
} */
.carousel-img-style{
  background-size: cover;
  width: 400px;
  height: 450px;
}
@media (max-width: 800px){
  .carousel-img-style{
    background-size: cover;
    width: fit-content;
    height: fit-content;
  }
}

/* for contacts */
.contact-section{
  height: 65vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
.heading-style{
  font-family: var(--font-sans);
  letter-spacing: 2px;
  text-transform: uppercase;
  opacity: 0.90;
  margin-top: 3em;
}
.contact-style{
  display: flex;
  justify-content: center;
  gap: 2em;
  margin-top: 2em;
}

.contacts{
  display: flex;
  justify-content: center;
  color: #f4f4f4;
  transition: transform 0.3s ease-out;
  transform: translateY(0);
}
@media screen and (max-width: 400px) {
  .contact-style{
    display: flex;
    justify-content: center;
    font-size: 12px;
  }
  .section-dark{
    height: max-content;   
  }
}
.contacts:hover{
  color: #f4f4f4; 
  transform: translateY(10px);
}

.lastfooter{
  display: flex;
  padding: 2em 0;
  justify-content: space-evenly;
  border-top: 4px solid rgb(204, 94, 94);
}