/* CSS Reset */
/* Resetting margins, paddings, and borders */
html, body,
h1, h2, h3, h4, h5, h6,
a, p, span,
em, small, strong,
sub, sup,
mark, del, ins, strike,
abbr, dfn,
blockquote, q, cite,
code, pre,
ol, ul, li, dl, dt, dd,
div, section, article,
main, aside, nav,
header, hgroup, footer,
img, figure, figcaption,
address, time,
audio, video,
canvas, iframe,
details, summary,
fieldset, form, label, legend,
table, caption,
tbody, tfoot, thead,
tr, th, td {
  border: 0;
  margin: 0;
  padding: 0;
}

/* Box sizing */
html {
  box-sizing: border-box;
}

*, *:before, *:after {
  box-sizing: inherit;
}

/* Sizing - Height */
body {
  min-height: 100vh;
}

/* Typography */
body {
  font-size: 1rem;
  line-height: 1.5;
}

* {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

a,
a:visited {
  color: inherit;
}

/* Resetting specific element styles */
ol,
ul {
  list-style: none;
}

img,
video {
  max-width: 100%;
}

img {
  border-style: none;
}

a {
  text-decoration: none;
}

/* Basic rules */
.page {
  background-color: hsl(0,0%,100%);
  color: hsl(210, 10%, 33%);
  font-family: 'Bai Jamjuree', sans-serif;
}

.container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/*  visible only to screen readers */
.sr-only {
  height: 1px;
  left: -10000px;
  position: absolute;
  overflow: hidden;
  top: auto;
  width: 1px;
}

.btn {
  border-radius: 30px;
  color: hsl(0,0%,100%);
  font-weight: 600;
  padding: 15px 36px;
}

.btn:visited {
  color: hsl(0,0%,100%);
}

.btn--bgcolor-cyan {
  background-color: hsl(171, 66%, 44%);
  box-shadow: 3px 3px 12px -3px #67cebf;
  transition: background-color .3s;
}

.btn--border-bottom-thick-cyan {
  border-bottom: 3px solid #1e9483;
}

.btn--bgcolor-cyan:hover {
  background-color: #51c7b6;
}

.btn--bgcolor-blue {
  background-color: hsl(233, 100%, 69%);
  box-shadow: 3px 3px 12px -3px #909DFF; 
  transition: background-color .3s;
}

.btn--border-bottom-thick-blue {
  border-bottom: 3px solid #4D5CCC ;
}

.btn--bgcolor-blue:hover {
  background-color: #808FFF;
}

/* Page header top */
.page-header__top {
  background-color: hsl(0,0%,100%);
  background-image:url(images/bg-header-mobile.png);
  background-repeat: no-repeat;
  background-size: 100% 400px;
  background-position: center top;
  min-height: 400px;
  padding: 40px 20px;
  text-align: center;
}

.page-header__logo {
  display: inline-block;
  margin-top: 100px;
}

/* Page header main */
.page-header__main {
  padding: 0 20px 40px;
  text-align: center;
}

.page-header__title {
  font-size: 2.2rem;
}

.page-header__copy {
  color: hsl(210,5%,46.7%);
  font-size: 1.125rem;
  margin-top: 20px;
}

.page-header__links {
  display: flex;
  flex-direction: column;
  margin-top: 50px;
}

.page-header__link:first-child {
  margin-bottom: 20px;
}

/* Page main */
.page-main {
  flex: 1;
}

.page-main__article {
  background-color: hsl(0,0%,100%);
}

.article-one,
.article-two,
.article-three,
.article-four,
.article-five {
  padding: 80px 20px;
  text-align: center;
}

.article-one__title,
.article-two__title,
.article-three__title,
.article-five__title {
  font-size: 1.9rem;
}

.article-one__copy,
.article-one__stack-copy,
.article-two__copy,
.article-three__copy,
.article-three__stack-copy,
.article-five__copy {
  color: hsl(210,5%,46.7%);
  font-size: 1.125rem;
  margin-top: 15px;
}

.article-one__image,
.article-two__image {
  display: inline-block;
  margin-top: 70px;
}

.article-one__stack-subtitle,
.article-three__stack-subtitle {
  font-size: 1.6rem;
}

.article-one__stack,
.article-three__stack {
  margin-top: 60px;
}

/* Page main - Article-three */
.article-three__stack-icon {
  height: 34px;
  margin-bottom: 40px;
}

/* Page main - Article-four */
.article-four {
  align-items: center;
  display: flex;
  flex-direction: column;
}

.article-four__logo:not(:last-child) {
  margin-bottom: 70px;
}

/* Page main - Article-five */
.article-five__links {
  display: flex;
  flex-direction: column;
  margin-top: 50px;
}

.article-five__link {
  color: hsl(0,0%,100%);
  font-weight: 600;
}

.article-five__link:first-child {
  margin-bottom: 20px;
}

/* Page footer */
.page-footer {
  background-color: hsl(220,17.6%,96.7%);
  padding: 60px 20px;
  text-align: center;
}

/* Page footer site logo */
.page-footer__site-logo {
  display: inline-block;
}

.site-logo {
  width: 64px;
}

/* Page footer nav */
.page-footer__nav {
  margin-top: 40px;
}

.page-footer__nav-stack:not(:first-child) {
  margin-top: 20px;
}

.page-footer__nav-item:not(:first-child) {
  margin-top: 20px;
}

.page-footer__nav-link {
  font-size: 1.125rem;
  transition: color .2s;
}

.page-footer__nav-link:visited {
  color: hsl(210, 10%, 33%);
}

.page-footer__nav-link:hover {
  color: hsl(171, 66%, 44%);
}

/* Page footer social icons */
.page-footer__social-icons {
  margin-top: 50px;
}

.page-footer__social-icon {
  display: inline-block;
  transition: color .2s;
}

.page-footer__social-icon:hover {
  color: hsl(171, 66%, 44%);
}

.page-footer__social-icon:not(:last-child) {
  margin-right: 40px;
}

.fa-square-facebook,
.fa-instagram,
.fa-twitter {
  font-size: 1.8rem;
}

@media (min-width: 768px) {
  .page-header__links {
    flex-direction: row;
    justify-content: center;
  }

  .page-header__link:first-child {
    margin-bottom: 0;
    margin-right: 20px;
  }

  .article-five__links {
    display: flex;
    flex-direction: row;
    justify-content: center;
    margin-top: 50px;
  }

  .article-five__link:first-child {
    margin-bottom: 0;
    margin-right: 20px;
  }
}

@media (min-width: 992px) {
  .page-header__top {
    background-image: url(images/bg-header-desktop.png);
    padding: 40px 80px;
  }
  
  .page-header__main {
    padding: 0 80px 40px;
  }

  .page-header__title {
    font-size: 3rem;
  }

  .page-header__copy {
    margin-left: auto;
    margin-right: auto;
    max-width: 620px;
  }

  .article-one__title,
  .article-two__title,
  .article-three__title,
  .article-five__title {
    font-size: 2.4rem;
  }

  .article-one__stack-subtitle,
  .article-three__stack-subtitle {
    font-size: 1.8rem;
  }

  .article-two,
  .article-three,
  .article-four,
  .article-five {
    padding: 80px;
  }

  .article-one {
    overflow: hidden;
    padding: 80px 80px 80px 0;
  }
  
  .article-one__copy {
    margin-left: auto;
    margin-right: auto;
    max-width: 700px;
  }
  
  .article-one__image {
    float: left;
    margin-left: -40px;
    width: 55%;
  }

  .article-one__stack {
    float: right;
    text-align: left;
    width: 40%;
  }

  .article-one__stack:first-of-type {
    margin-top: 90px;
  }
  
  .article-two__copy {
    margin-left: auto;
    margin-right: auto;
    max-width: 670px;
  }

  .article-three__large-stack {
    display: flex;
  }
  
  .article-three__stack {
    flex: 1;
  }
  
  .article-three__stack:not(:last-child) {
    margin-right: 30px;
  }

  .article-four {
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
  }

  .article-four__logo:not(:last-child) {
    margin-bottom: 0;
  }

  .article-five__copy {
    margin-left: auto;
    margin-right: auto;
    max-width: 680px;
  }

  .article-five__link {
    color: hsl(0,0%,100%);
    font-weight: 600;
  }

  .page-footer {
    display: flex;
    justify-content: space-between;
    padding: 60px 80px;
    text-align: left; 
  }
  
  .page-footer__nav {
    display: flex;
    margin-top: 0; 
  }

  .page-footer__nav-stack:not(:last-child) {
    margin-right: 80px;
  }
  
  .page-footer__nav-stack:not(:first-child) {
    margin-top: 0;
  }

  .page-footer__nav-item:not(:first-child) {
    margin-top: 20px;
  }
  
  .page-footer__social-icons {
    margin-top: 25px;
  }
}