@font-face {
    font-family: 'Whitney Light';
    src: url('./assets/fonts/whitneylight.woff') format('woff');
}

@font-face {
    font-family: 'Whitney Medium';
    src: url('./assets/fonts/whitneymedium.woff') format('woff');
}

@font-face {
    font-family: 'Whitney Bold';
    src: url('./assets/fonts/whitneybold.woff') format('woff');
}

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

html {
    font-size: 62.5%;
}

:root {
    --light-clr: #FFF;
    --dark-clr: #23272A;
    --brand-clr: #7289DA;
    --off-white-clr: #f6f6f6;
    --general-font-size: 2rem;
    --primary-title-font-size: 4.8rem;
    --secondary-title-font-size: 4rem;
    --main-font-family-light: 'Whitney Light', sans-serif;
    --main-font-family-medium: 'Whitney Medium', sans-serif;
    --main-font-family-bold: 'Whitney Bold', sans-serif;
    --num-of-grid-columns: 4;
    --section-spacing: 5.6rem 2.4rem;
    --container-width: 126rem;
}

body {
    font-size: var(--general-font-size);
    font-family: var(--main-font-family-light);
}

a {
    text-decoration: none;
    display: inline-block;
}

img {
    max-width: 100%;
    display: block;
}
.hero{
background: url("./assets/images/hero-bg.jpg") center/cover;
}
.main-header{
height:8rem;
padding: 0 2.4rem;
}
.container{
max-width: var(--container-width);
margin: 0 auto;
}
.main-nav{
height: 100%;
display: flex;
align-items: center;
justify-content: space-between;
}
.logo{
width: 12.4rem;
}
.nav-list{
display: none;
}
.nav-items-right{
display: flex;
align-items:center;
}
.btn:hover{
box-shadow: 0 .8rem 1.5rem rgba(0,0,0,.2);
}
.btn-small{
font-size: 1.4rem;
padding: .7rem 1.6rem;
border-radius: 4rem;
}
.btn-light{
background-color: var(--light-clr);
color: var(--dark-clr);
}
.btn-light:hover{
color: var(--brand-clr);
}
.btn-login{
margin-right: 1.6rem;
line-height:1.8;
}
.mobile-toggle{
display: flex;
font-size: 3.6rem;
color: var(--light-clr);
cursor: pointer;
}
.btn-close{
display:none;
}
.row{
display:grid;
grid-template-columns: repeat(var(--num-of-grid-columns),1fr);
gap: 0 2rem;
padding: var(--section-spacing);
}
.hero-content-wrap{
grid-column: span var(--num-of-grid-columns);
color: var(--light-clr);
}
.title{
font-family: var(--main-font-family-bold);
}
.primary-title{
font-size:var(--primary-title-font-size);
line-height: 397%;
}
.hero-description{
line-height:1.2rem;
margin-top:2.2rem;
}
.hero-btn-group .btn-light{
margin:2.4rem 2.4rem 0 0;
display: inline-flex;
}
.hero-btn-group .btn-light i{
align-self: center;
margin-right: .8rem;
}
.btn-large{
padding:1.6rem 3.2rem;
border-radius: 2.8rem;
}
.btn-dark{
background-color: var(--dark-clr);
color:var(--light-clr);
margin-top:2.4rem;
transition: background-color .5s;
}
.btn-dark:hover{
background-color: #36393f;
}
/*Collaboration*/
.grid-image{
margin-top: 2.4rem;
grid-column:span 4;
}
.text-group{
margin-top: 2rem;
grid-column:span var(--num-of-grid-columns);
}
.secondary-title{
font-size: var(--secondary-title-font-size);
}
.text-group p{
margin-top: 2rem;
line-height: 3.2rem;
}
/*Voice channel*/
.voice-channel{
background-color: var(--off-white-clr);
}
.wave{
color: var(--off-white-clr);
display: block;
}
.wave-path{
 animation: wave-animation 20s linear infinite alternate;
}
@keyframes wave-animation {
    0% {
        d: path("M826.337463,25.5396311 C670.970254,58.655965 603.696181,68.7870267 447.802481,35.1443383 C293.342778,1.81111414 137.33377,1.81111414 0,1.81111414 L0,150 L1920,150 L1920,1.81111414 C1739.53523,-16.6853983 1679.86404,73.1607868 1389.7826,37.4859505 C1099.70117,1.81111414 981.704672,-7.57670281 826.337463,25.5396311 Z");
    }
    50% {
        d: path("M655.558582,28.4898877 C500.191373,61.6062216 422.833785,83.5422763 266.940085,49.8995879 C112.480383,16.5663637 84.0992497,8.02840272 0,44.7243294 L0,150.727527 L1920,150.727527 L1920,49.8995879 C1580.91676,-34.8808285 1438.10804,73.6768193 1148.0266,38.0019829 C857.945166,2.32714659 810.925791,-4.62644617 655.558582,28.4898877 Z");
    }
    100% {
        d: path("M842.322034,38.0019829 C686.954825,71.1183168 623.386282,53.08497 467.492582,19.4422816 C313.032879,-13.8909426 84.0992497,8.02840272 0,44.7243294 L0,150.727527 L1920,150.727527 L1920,76.8685643 C1512.23604,-35.3595639 1568.70222,67.4289432 1278.62078,31.7541069 C988.539347,-3.92072949 997.689243,4.88564905 842.322034,38.0019829 Z");
    }
}
.wave-inverted{
transform: matrix(1,0,0,-1,0,0);
}
/*Video call*/
.video-call{
background-color: var(--off-white-clr);
}
.video-call .row{
padding-bottom:8rem;
}
.video-call .text-group{
grid-column: span var(--num-of-grid-columns);
margin-top:0;
}
.video-call .text-group p{
margin-top: 2.4rem;
}
/*Download*/
.download{
background-color: var(--off-white-clr);
position: relative;
}
.download .remove-grid{
display: block;
padding-top: 0;
text-align: center;
}
.sparkles{
display:inline-block;
}
.download h2{
font-size: 3.2rem;
font-family: var(--main-font-family-medium);
}
.btn-brand{
background-color: var(--brand-clr);
color: var(--light-clr);
margin-top: 4rem;
transition: background-color .5s;
}
.download .btn-brand{
margin-top: 4rem;
}
.btn-brand:hover{
background-color:#8ea1e1;
}
/*Main footer*/
.main-footer{
background-color: var(--dark-clr);
color:var(--light-clr);
 padding: 8rem 2.4rem 6.4rem;
}
.main-footer .row{
   padding: 0;
}
.info-box{
grid-column: span 4;
margin-bottom:5.6rem;
}
.footer-title{
color:var(--brand-clr);
}
.info-box .footer-title{
font-size: 3.2rem;
font-family: var(--main-font-family-medium);
}
.languages{
margin: 2.4rem 0;
display: flex;
align-items:center;
font-size: 1.4rem;
}
.languages img{
width: 2.4rem;
}
.languages span{
margin: 0 .8rem;
}
.sm-link{
font-size: 2.3rem;
color:inherit;
margin-right: 2rem;
}
.spacer{
display: none;
}
.footer-links-group{
margin-bottom: 4rem;
font-size: 1.6rem;
grid-column:span 2;
}
.footer-links-group .footer-title{
font-size: inherit;
padding-top: .8rem;
font-weight: 100;
}
.footer-link{
display: block;
margin-top: 1.2rem;
color:inherit;
}
.divider{
grid-column: 1/-1;
height: 1px;
background-color: var(--brand-clr);
margin-bottom: 3.2rem;
}
.main-footer .remove-grid{
display:flex;
align-items: center;
justify-content: space-between;
}
.main-footer.btn-brand{
line-height: 1.8;
}
@media screen and (min-width: 768px){
  :root {
      --primary-title-font-size: 5.6rem;
      --secondary-title-font-size: 4.8rem;
      --num-of-grid-columns: 8;
      --section-spacing: 8rem  4rem;
  }
  .hero{
    min-height: 62.6rem;
  }
  .hero-content-wrap{
    grid-column: span 5;
  }
  .hero-description{
   margin-top: 4rem 0 .8rem;
  }
  .grid-image{
   margin: auto 0;
  }
  .text-group{
   margin-top: 0;
   display: flex;
   flex-direction: column;
   justify-content: center;
  }
  .order-1{
    order:1;
  }
  .order-2{
  order:2;
  }
  .video-call{
    text-align: center;
  }
  .info-box{
   grid-column: span 3;
   grid-row: span 2;
  }
  .spacer{
    display:block;
    grid-row:span 2;
  }
}
@media screen and (min-width: 1024px){
  :root {
      --num-of-grid-columns: 12;
      --section-spacing: 12rem  4rem;
  }
  .nav-list{
    display: flex;
    list-style: none;
  }
  .nav-link{
  font-size: 1.6rem;
  color: var(--light-clr);
  margin:0 1 rem;
  padding: 1rem;
  font-weight: bold;
  }
  .nav-link:hover{
     text-decoration:underline;
  }
  .hero-content-wrap{
   grid-column: 3/span 8;
   text-align: center;
  }
  .mobile-toggle{
   display: none;
  }
  .grid-image{
   grid-column: span 7;
   margin: 0;
  }
  .text-group{
    grid-column: 9/-1;
  }
  .order-1{
    grid-column: 1/span 4;
  }
  .order-2{
    grid-column: 6/-1;
  }
.video-call .text-group{
  grid-column: 2/span 10;
}