@import url('https://fonts.googleapis.com/css?family=DM+Serif+Display|Karla:400,700&display=swap');

:root{
  --dark-violet:hsl(256, 26%, 20%);
  --grayish:hsl(216, 30%, 68%);
  --very-dark-violet:hsl(270, 9%, 17%);
  --dark-grayish-violet:hsl(273, 4%, 51%);
  --very-light-gray:hsl(0, 0%, 98%);
  --light-gray: hsl(0, 0%, 83%);
}

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

html{
  font-size: 62.5%;
}

body{
  font-family: 'Karla', sans-serif;
  font-size: 1.6rem;
  overflow-x: hidden;
}

/***** GENERAL CSS *****/
h1, h2, h3{
  font-family: 'DM Serif Display', serif;
  font-weight: 400;
  color: var(--very-dark-violet);
}

.button{
  text-decoration: none;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 1.4rem;
  padding: 1rem 2rem;
  display: inline-block;
}

hr{
  height: 1px;
  border: none;
  opacity: 65%;
}

.hr--small{
  max-width: 20rem;
  margin-bottom: 5rem;
}

.container{
  width: 75%;
  margin: 0 auto;
}
/***** GENERAL CSS END *****/

/***** UTILS *****/
.util-block{
  display: block;
}      

.util-hide{
  display: none;
}
/***** UTILS END *****/


/***** NAVIGATION *****/
.nav--fixed{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: white;
  z-index: 100;
}

.nav__row{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2rem 0;
  min-height: 8.1rem;
  height: 100%;
}

.link{
  text-decoration: none;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 1.4rem;
}

.nav__link{
  color: var(--dark-grayish-violet);
  margin-left: 3.5rem;
}

.nav__links{
  display: flex;
  align-items: center;
}

.nav__link:hover{
  color: var(--very-dark-violet);
}

.button--nav{
  margin-left: 3.5rem;
}

.button--dark{
  color: var(--very-dark-violet);
  border: 2px solid var(--very-dark-violet);
}

.button--dark:hover{
  color: white;
  background-color: var(--very-dark-violet);
}

.nav__buttons{
  display: none;
  cursor: pointer;
}
/***** NAVIGATION END *****/

/***** HEADER *****/
.header{
  background: linear-gradient(to bottom, var(--dark-violet) 80%, white 20%);
  position: relative;
}

.header::before{
  content: url(./images/bg-pattern-intro-right-desktop.svg);
  position: absolute;
  right: 0;  
}

.header::after{
  content: url(./images/bg-pattern-intro-left-desktop.svg);
  position: absolute;
  bottom: -12rem;
  z-index: 9;
}

.header__row{
  display: flex;
  padding-top: 10rem;
}

.header__text{
  flex: 1;
  margin-right: 3rem;
  color: white;
  z-index: 10;
}

.header__hr{
  background-color: white;
}

.header__heading{
  font-size: 6rem;
  line-height: 1.1;
  color: inherit;
}

.header__description{
  max-width: 55rem;
  margin: 3rem 0;
}

.button--light{
  color: white;
  border: 1px solid white;
}

.button--light:hover{
  background-color: white;
  color: var(--dark-violet);
}

.header__image-container{
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.header__image{
  max-width: 65rem;  
  width: 100%;
}
/***** HEADER END *****/

/***** INFO SECTION *****/
.info{
  padding: 16rem 0;
}

.info__hr{
  background-color: var(--dark-grayish-violet);
}

.info__heading{
  font-size: 6rem;
}

.info__card-wrapper{
  display: flex;
  margin-top: 5rem;
  justify-content: space-between;
}

.card{
  flex: 1;
}

.card:not(:last-child){
  margin-right: 1rem;
}

.card__heading{
  margin: 2.2rem 0 1.5rem 0;
  font-size: 2.4rem;
}

.card__description{
  max-width: 36rem;
  color: var(--dark-grayish-violet);
}
/***** INFO SECTION END *****/

/***** BANNER SECTION *****/
.banner__container{
  color: white;
  background-color: var(--dark-violet);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6rem;
  position: relative;
  overflow: hidden;
}

.banner__container::before{
  content: url(./images/bg-pattern-how-we-work-desktop.svg);
  position: absolute;
  right: 0;
  top: 0;
}

.banner__heading{
  color: inherit;
  font-size: 4rem;
}

.button--banner{
  align-self: center;
  z-index: 10;
}
/***** BANNER SECTION END *****/

/***** FOOTER SECTION  *****/
.footer{
  margin-top: 16rem;
  background-color: var(--very-light-gray);
  background-image: url(./images/bg-pattern-footer-desktop.svg);
  background-position: top left;
  background-repeat: no-repeat;  
}

.social{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5rem 0;
  border-bottom: 1px solid var(--light-gray);
}

.social__icon{
  cursor: pointer;
  margin-left: 1.5rem;
}

.social__icon:hover path{
  fill: var(--very-dark-violet);
}

.links-container{
  display: flex;
}

.link-group{
  flex: 1;
  display: flex;
  flex-direction: column;
  text-transform: uppercase;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 2px;
}

.link-group a{
  text-decoration: none;
  color: var(--very-dark-violet);
}

.link-group a:hover{
  text-decoration: underline;
}

.link-group a:not(:last-child){
  margin-bottom: 1rem;
}

.link-group__header{
  margin: 3rem 0;
  color: var(--dark-grayish-violet);
}

.attribution {
  font-size: 1.4rem; 
  text-align: center; 
  padding: 5rem 0;
}

.attribution a { 
  color: hsl(228, 45%, 44%); 
}

/***** FOOTER SECTION END *****/

@media screen and (max-width:1265px){
  .container{
    width: 95%;
  }

  .header::before{
    width: 25%;
  }
}

@media screen and (max-width:1000px){
  .header::after{
    left: -10rem;
  }

  .header__row{
    padding-top:5rem ;
  }

  .header__heading{
    font-size: 4rem;
  }

  .header__hr{
    margin-bottom: 3rem;
  }
}

@media screen and (max-width:775px){
  .header{
    background: var(--dark-violet);
  }

  .header__heading{
    font-size: 3.5rem;
  }
}

@media screen and (max-width:650px){
  html{
    font-size: 56.25%;
  }

  .container--header{
    width: 100%;
  }

  .nav__links{
    display: none;
  }

  .nav__links--mobile{
    position: absolute;
    top: 8.1rem;
    width: 100%;
    height: calc(100% - 8.1rem) ;
    background-color: var(--very-dark-violet);
    left: 0;
    display:flex;
    flex-direction: column;
    background-image: url(./images/bg-pattern-mobile-nav.svg);
    background-position: bottom;
    background-repeat: no-repeat;
    background-size: 100%;
  }
  
  .nav__link{
    margin: 2rem 0;
    color: white;
    font-size: 2rem;
  }

  .button--nav{
    margin: 2rem 0;
    color: white;
    border: 2px solid white;
    width: 80%;
    text-align: center;
    font-size: 2rem;
  }

  .nav__buttons{
    display: block;
  }

  .header::before, .header::after{
    content: none;
  }

  .header__row{
    flex-direction: column;
    padding-top: 0;
  }
  
  .header__image{
    max-width: 100%;
  }

  .header__text{
    order: 1;
    margin: 8rem  2rem;
    text-align: center;
    position: relative;
  }

  .header__description{
    max-width: 100%;
  }

  .header__text::before{
    content: url(./images/bg-pattern-intro-left-mobile.svg);
    position: absolute;
    top: -8rem;
    left: -2rem;
  }

  .header__text::after{
    content: url(./images/bg-pattern-intro-right-mobile.svg);
    position: absolute;
    right: -4.5rem;
  }

  .header__hr{
    display: none;
  }

  .info{
    text-align: center;
    padding: 12rem 0;
  }
  
  .info__hr{
    display: inline-block;
    width: 15rem;
    margin-bottom: 1.5rem;
  }

  .info__heading{
    font-size: 3.5rem;
  }

  .info__card-wrapper{
    flex-direction: column;
  }

  .card__description{
    max-width: 100%;
  }

  .card:not(:last-child){
    margin-bottom: 3rem;
  }

  .banner__container{
    flex-direction: column;
    text-align: center;
  }

  .banner__container::before{
    content: url(./images/bg-pattern-how-we-work-mobile.svg);
  }

  .banner__heading{
    line-height: 1.1;
    font-size: 3.5rem;
  }

  .button--banner{
    margin-top: 3rem;
  }

  .footer{
    background-image: url(./images/bg-pattern-footer-mobile.svg);
    background-position: top -6.5rem left -6.5rem;
    margin-top: 12rem;
  }

  .social{
    flex-direction: column;
  }

  .social__icons{
    margin-top: 3rem;
  }

  .links-container{
    flex-direction: column;

  }

  .link-group{
    align-items: center;
  }
}