:root{
  --clr-gray-dark-1: #777;
  --clr-gray-dark-2: #333;
  --clr-gray: #ddd;
  --clr-gray-light-1: #fdfdfd;
  --clr-gray-light-2: #eee;
  --clr-white: #fff;
  --clr-accent: #00518A;
  --clr-accent-1: #0285bd;
  --clr-accent-1--light: #c1deeb;
  /* --clr-accent-2: #E31C3D; */
  --clr-accent-2: #CC3B33;

  --ff-primary: 'Roboto', sans-serif;
  --ff-secondary: 'Montserrat', sans-serif;

  --fw-medium: 500;
  --fw-light: 300;
  --fw-bold: 700;

  --box-shadow-sm: 2px 2px .5rem rgba(0, 0, 0, .15);

  --border-radius-100: .5rem;

  --fz-normal: 1.7rem;
  --fz-brake-fix: 1.6rem;
}

*, *::after, *::before {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
  font-family: inherit;
}

h1, h2, h3{
  font-weight: normal;
}

img{
  display: block;
  width: 100%;
}

a, a:link, a:visited{
  text-decoration: none;
  color: var(--clr-accent-1);
}

a:hover, a:active{
  color: var(--clr-accent);
}

sup a:link{
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
}

html {
  font-size: 62.5%;
}

@media (max-width: 50em) {
  html{
      font-size: 56.25%;
  }
}

body{
  box-sizing: border-box;
  font-family: var(--ff-primary);
  background-color: var(--clr-gray);
  font-size: var(--fz-brake-fix);
  color: var(--clr-gray-dark-2);
  line-height: 1.3;
}

/*** UTILITIES ***********************************************/
.mb-100{
  margin-bottom: 1.5rem;
}

.center-block{
  margin: 0 auto;
}

.flex-space-between{
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.heading-tertiary {
  font-family: var(--ff-secondary);
  font-weight: var(--fw-bold);
  margin-bottom: 1rem;
}

.column-1{
  column-count: 1 !important;
}

/*** --- LAYOUT --- ***********************************/

.container{
  margin: 0 auto;
  max-width: 90rem;
  background-color: #fff;
}

.header{
  display: grid;
  grid-template-areas: 
  'logo title'
  'nav nav';
  align-items: center;
  row-gap: 5rem;
  padding-top: 2rem;
  column-gap: 2.5rem;
}


.header__logo{
  grid-area: logo;
  border-right: 1px solid var(--clr-accent-2);
  max-width: 25rem;
  padding-right: 2.5rem;
  justify-self: end;
}

.header__title{
  justify-self: start;
  grid-area: title;
  font-size: 5rem;
  font-family: var(--ff-secondary);
}

.header__title span{
  color: #00518A;
  font-weight: var(--fw-bold);
}

.header__date {
  color: var(--clr-accent);
  font-weight: var(--fw-bold);
  justify-self: end;
  align-self: center;
}

/*** NAVIGATION *******************************************/

/* BACK TO TOP */
.back-to-top {
  margin-left: auto;
  margin-right: 2rem;

  top: 4rem;
  right: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4rem;
  height: 4rem;
  /* text-align: center; */
  background-color: var(--clr-accent);
  border-radius: 100%;
  opacity: 0;
  pointer-events: none;
  visibility: hidden;
  position: absolute;
}

.back-to-top:hover {
  background-color: var(--clr-accent-1);
}

/* arrow img */

.back-to-top img {
  width: 2.5rem;
  display: block;
}

.show-back-to-top {
  position: sticky;
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
  transition: all .3s;
}
/* end back to top */

.nav{
  grid-area: nav;
  width: 90%;
  margin: 0 auto;
}

/* .nav[data-visible]{
  display: block;
} */

.nav__list{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
  gap: 1.5rem;
  column-gap: 3rem;
  list-style: none;
  font-family: var(--ff-secondary);
  font-size: 1.5rem;
}

.nav__item:not(:last-child){
  display: flex;
  gap: .75rem;
  align-items: center;

}

.nav__item img{
  width: 1rem;
}

.nav__item span {
  color: var(--clr-accent-2);
}

.nav__link, .nav__link:link, .nav__link:visited{
  border-radius: var(--border-radius-100);
  font-weight: var(--fw-medium);
  border: 1px solid var(--clr-gray);
  width: 100%;
  display: inline-block;
  color: var(--clr-gray-dark-1);
  transition: all .3s;
  padding: .5rem .5rem .5rem 1rem ;
}

.nav__link:hover, .nav__link:active{
  /* background-image: linear-gradient(-45deg, var(--clr-gray), var(--clr-gray-light-1)); */
  background-color: var(--clr-gray-light-2);
  border: var(--clr-gray-light-2);
  color: var(--clr-accent);
  box-shadow: var(--box-shadow-sm);
}

/*** ARTICLES ***********************************************/

.content{
  padding: 5rem 7rem 7rem;
}

.lead__img {
  margin-top: 1rem;
  /* height: 34rem; */
  /* background-image: linear-gradient(-45deg,  var(--clr-gray), var(--clr-gray-light-1)); */
  /* background-color: var(--clr-accent-1); */
  border-radius: var(--border-radius-100);
  overflow: hidden;
  box-shadow: var(--box-shadow-sm);
}

.lead__img img{
  height: 100%;
  object-fit: cover;
}

.article:not(:first-child), .fun-facts, .mailing-list{
  margin-top: 4rem;
}

.article__header{
  font-size: 1.75rem;
  margin-bottom: 2rem;
  color: var(--clr-gray-dark-1);
}

.article__title{
  font-size: 3rem;
  margin-bottom: 1rem;
  font-family: var(--ff-secondary);
  font-weight: var(--fw-bold);
}

.article__title a {
  color: var(--clr-gray-dark-2);
}

.article__deck{
  font-family: var(--ff-secondary);
  font-weight: var(--fw-medium);
  font-size: 2rem;
  max-width: 42ch;
  margin-bottom: 1rem;
}

.article__by-name{
  font-weight: var(--fw-medium);
}

.article__by-title{
  font-weight: var(--fw-light);
  font-style: italic;
}

.article__body{
  columns: 2;
}

.article__body p {
  margin-bottom: 1.5rem;
}

/* article lists */

.article ul{
  margin-left: 3rem;
}

/* end article lists */


/* article boxes */

.article__box{
  background-color: var(--clr-accent-1--light);
  border-radius: var(--border-radius-100);
  padding: 1rem;
}

 .article__box p:last-child{
  margin-bottom: 0;
 }


.article__footer{
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--clr-accent);
  font-size: 1.3rem;
  color: var(--clr-gray-dark-1);
}

/*** FUN FACTS ***************************************/



.heading-secondary {
  font-size: 2rem;
  font-weight: var(--fw-medium);
}

.authors{
  margin-top: 2rem;
  display: grid;
  grid-auto-columns: 1fr;
  grid-auto-flow: column;
  gap: 4rem;
}

.author__img{
  width: 9rem;
  height: 9rem;
  overflow: hidden;
  border-radius: 50%;

  float: left;
  margin-right: 1.5rem;
  margin-bottom: 1rem;
  
  outline-offset: .5rem;
  outline: 1px solid var(--clr-accent);
  
}

.author__img img{
  height: 100%;
  object-fit: cover;
}

.author__bio{
  font-size: 1.5rem;
}

/*** MAILING LIST *******************************/

.mailing-list p {
  margin-top: 2rem;
}


/*** FOOTER *******************************/

.footer{
  padding: 4rem;
  background: var(--clr-gray-dark-1);
  color: var(--clr-gray-light-1);
  text-align: center;
}


.footer a, .footer a:visited, .footer a:link {
  color: inherit;
  transition: all .3s;
}

.footer a:hover, .footer a:active{
  color: var(--clr-accent);
}

.footer p:first-child{
  font-weight: var(--fw-medium);
  margin-bottom: 1rem;
  color: black;
}

.footer__links{
  margin: 3rem 0;
  display: flex;
  justify-content: center;
  gap: 1rem;
  font-size: 1.4rem;
}

.copyright{
  font-size: 1.2rem;
}