/* 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: #fff;
  color: #000;
  font-family: 'Open Sans', sans-serif;
}

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

.page-header__main-title,
.article-one__title,
.article-two__title,
.article-three__title,
.article-four__title,
.page-footer__title {
  font-family: 'Poppins', sans-serif;
}

.cta-btn {
  background-color: hsl(322, 100%, 66%);
  border: 1px solid transparent;
  border-radius: 30px;
  box-shadow: 3px 3px 12px -3px rgba(0, 0, 0, .3);
  color: #fff;
  font-weight: 700;
  padding: 18px 32px;
  text-transform: capitalize;
  transition: background-color .2s;
}

.cta-btn:visited {
  color: #fff;
}

.cta-btn:hover {
  background-color: hsl(321, 100%, 78%);
}

.error {
  color: hsl(0, 100%, 63%);
  display: none;
  margin-left: 20px;
  margin-top: 10px;
  font-size: .875rem;
  flex-basis: 100%;
}

.active {
  display: block;
}

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

/* Page header */
.page-header {
  padding: 40px 80px 80px;
}

/* Page header top */
.page-header__top {
  align-items: center;
  display: flex;
  justify-content: space-between;
}

.page-header__top-logo {
  height: 36px;
}

.header-site-logo {
  height: 36px;
}

.page-header__top-link {
  background-color: #fff;
  border: 1px solid hsl(322, 100%, 66%);
  border-radius: 30px;
  color: hsl(322, 100%, 66%);  
  padding: 10px 24px;
  text-transform: capitalize;
  transition: color .2s;
}

.page-header__top-link:visited {
  color: hsl(322, 100%, 66%);
}

.page-header__top-link:hover {
  color: hsl(321, 100%, 78%)
}

/* Page header main */
.page-header__main-title {
  font-size: 2.7rem;
  margin-top: 150px;
  text-align: center;
}

.page-header__main-copy,
.page-header__main-link {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.page-header__main-copy {
  margin-top: 30px;
  max-width: 500px;
}

.page-header__main-link {
  display: block;
  margin-top: 50px;
  max-width: 330px;
}

.page-header__main-image {
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-top: 100px;
}

.page-header__stack {
  display: flex;
  justify-content: space-around;
  margin-top: 100px;
}

.page-header__stack-title {
  font-weight: 700;
  font-size: 6rem;
}

.page-header__stack-copy {
  color: #a5a6aa;
  font-size: 1.3rem;
  text-align: center;
}

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

/* Page main article */
.page-main__article {
  padding: 80px;
}

.article-one,
.article-two,
.article-three {
  display: flex;
}

.article-one__section,
.article-two__section,
.article-three__section{
  flex: 50%;
}

.article-one__title,
.article-two__title,
.article-three__title,
.article-four__title {
  font-size: 2.2rem;
}

.article-one__copy,
.article-two__copy,
.article-three__copy {
  margin-top: 20px;
}

.article-one,
.article-three {
  background-color: #f6fbff;
  margin-top: 150px;
  margin-bottom: 150px;
  position: relative;
}

.article-one__section:first-child,
.article-three__section:first-child {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-right: 80px;
}

.article-one::before {
  background-image: url(images/bg-section-top-desktop-1.svg);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  content: "";
  height: 165px;
  left: 0;
  position: absolute;
  top: -165px;
  transform: translateY(1px);
  width: 100%;
}

.article-one::after {
  background-image: url(images/bg-section-bottom-desktop-1.svg);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  bottom: -139px;
  content: "";
  height: 139px;
  left: 0;
  position: absolute;
  transform: translateY(-1px);
  width: 100%;
}

.article-two__section:last-child {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-left: 80px;
}

.article-three::before {
  background-image: url(images/bg-section-top-desktop-2.svg);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  content: "";
  height: 156px;
  left: 0;
  position: absolute;
  top: -156px;
  transform: translateY(1px);
  width: 100%;
}

.article-three::after {
  background-image: url(images/bg-section-bottom-desktop-2.svg);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  bottom: -139px;
  content: "";
  height: 139px;
  left: 0;
  position: absolute;
  transform: translateY(-1px);
  width: 100%;
}

.article-four__title {
  text-align: center;
}

.article-four__link {
  display: block;
  margin-left: auto;
  margin-right: auto;
  margin-top: 50px;
  max-width: 330px;
  text-align: center;
}

/* Page footer */
.page-footer {
  background-color: #00252e;
  color: #fff;
  display: flex;
  justify-content: space-between;
  margin-top: 200px;
  padding: 80px;
  position: relative;
}

.page-footer::before {
  background-image: url(images/bg-footer-top-desktop.svg);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  background-position: center;
  content: "";
  height: 158px;
  left: 0;
  position: absolute;
  top: -158px;
  transform: translateY(1px);
  width: 100%;
}

.page-footer__section {
  flex-basis: 500px;
}

.page-footer__logo {
  display: inline-block;
  height: 36px;
  margin-bottom: 30px;
}

.footer-site-logo {
  filter:  brightness(0) invert(1);
  height: 36px;
}

.page-footer__copy {
  max-width: 370px;
}

.page-footer__contact {
  display: flex;
  margin-top: 30px;
}

.page-footer__contact-item:last-child {
  margin-left: 20px;
}

.page-footer__social {
  display: flex;
  margin-top: 80px;
}

.page-footer__social-item:not(:last-child) {
  margin-right: 20px;
}

.fa-square-facebook,
.fa-square-twitter,
.fa-instagram {
  font-size: 2rem;
  transition: color .2s;
}

.fa-square-facebook:hover {
  color: #4267B2;
}

.fa-square-twitter:hover {
  color: #1DA1F2;
}

.fa-instagram:hover {
  color: #833AB4;
}

.page-footer__title {
  font-size: 1.66rem;
  margin-bottom: 30px;
  text-transform: uppercase;
}

.page-footer__form {
  display: flex;
  flex-wrap: wrap;
  margin-top: 30px;
}

.page-footer__email {
  border: 1px solid transparent;
  border-radius: 6px;
  flex: 2;
  padding: 12px 14px;
}

.page-footer__email:focus {
  outline: none;
}

.page-footer__email:invalid {
  border: 2px solid hsl(0, 100%, 63%);
}

.page-footer__submit {
  background-color: hsl(322, 100%, 66%);
  border: 1px solid transparent;
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  flex: 1;
  font-weight: 700;
  margin-left: 20px;
  padding: 12px 0;
  text-transform: capitalize;
  transition: background-color .2s;
}

.page-footer__submit:visited {
  color: #fff;
}

.page-footer__submit:hover {
  background-color: hsl(321, 100%, 78%);
}

@media (max-width: 991px) {
  .page-header__stack {
    align-items: center;
    flex-direction: column;   
  }
  
  .page-header__stack-section {
    width: 290px;
  }

  .page-header__stack-section:last-child {
    margin-top: 100px;
  }

  .article-one,
  .article-two,
  .article-three {
    flex-wrap: wrap;
  }
  
  .article-one__section,
  .article-two__section,
  .article-three__section{
    flex: 100%;
  }

  .article-one__section--order-2,
  .article-three__section--order-2 {
    order: 2;
  }

  .article-one__section--order-1,
  .article-three__section--order-1 {
    order: 1;
  }

  .article-one__section:first-child,
  .article-two__section:last-child,
  .article-three__section:first-child {
    justify-content: flex-start;
    margin-top: 100px;
    text-align: center;
  }

  .article-one__section:first-child,
  .article-three__section:first-child {
    padding-right: 0;
  }
  
  .article-two__section:last-child {
    padding-left: 0;
  }

  .page-footer {
    flex-wrap: wrap;
  }
  
  .page-footer__section {
    flex: 100%;
  }
  
  .page-footer__section:first-child {
    margin-top: 100px;
    order: 2;
  }
  
   .page-footer__section:last-child {
    order: 1;
  }
}

@media (max-width: 767px) {
  .page-header {
    padding: 40px 40px 80px;
  }
  
  .page-main__article,
  .page-footer {
    padding: 80px 40px;
  }
}

@media (max-width: 575px) {
  .page-header {
    padding: 40px 20px 80px;
  }
  
  .page-header__top-logo,
  .header-site-logo {
    height: 28px; 
  }
  
  .page-header__top-link {
    padding: 8px 20px;
  }

  .page-header__main-title {
    font-size: 2.2rem;
  }
  
  .page-main__article {
    padding: 80px 20px;
  }
   
  .article-one__title,
  .article-two__title,
  .article-three__title,
  .article-four__title {
    font-size: 1.7rem;
  }
  
  .page-footer {
    padding: 80px 20px;
  }
  
  .page-footer__form {
    flex-direction: column;
  }

  .page-footer__email {
    order: 1;
    width: 100%;
  }

  .error {
    order: 2;
  }

  .page-footer__submit {
    margin-left: auto;
    margin-top: 15px;
    order: 3;
    width: 50%;
  }
}

@media (max-width: 375px) {
  .article-one::before {
    background-image: url(images/bg-section-top-mobile-1.svg);
    height: 112px;
    top: -112px;
  }

  .article-one::after {
    background-image: url(images/bg-section-bottom-mobile-1.svg);
    bottom: -52px;
    height: 52px;
  }

  .article-three::before {
    background-image: url(images/bg-section-top-mobile-2.svg);
    height: 103px;
    top: -103px;
  }

  .article-three::after {
    background-image: url(images/bg-section-bottom-mobile-2.svg);
    bottom: -101px;
    height: 101px;
  }
  
  .page-footer::before {
    background-image: url(images/bg-footer-top-mobile.svg);
    height: 53px;
    top: -53px;
  }
}

@media (max-width: 360px) {
  .page-header__top {
    align-items: flex-start;
    flex-direction: column;
  }

  .page-header__top-link { 
    margin-top: 30px;
    text-align: center;
    width: 100%;
  }
}

@media (max-width: 325px) {
  .page-header__stack-section {
    width: 100%;
  }
  
  .page-header__stack-title {
    font-size: 5.5rem;
  }

  .page-header__stack-copy {
    font-size: 1.125rem;
  }
}

@media (max-width: 300px) {
  .page-header__stack-title {
    font-size: 5rem;
  }
}