@font-face {
  font-family: 'Montserrat';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url(Montserrat-BoldItalic.ttf) format('truetype');
}
@font-face {
  font-family: 'Montserrat';
  font-style: italic;
  font-weight: 700;
  font-display: swap;
  src: url(Montserrat-BoldItalic.ttf) format('truetype');
}
@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(Montserrat-Regular.ttf) format('truetype');
}
@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(Montserrat-Bold.ttf) format('truetype');
}

* {
  margin: 0;
  padding: 0;
}

html { font-size: 62.5%; }

body {
  font-family: Montserrat, Arial, Helvetica, sans-serif;
  font-size: 1.5em;
  font-weight: 400;
  line-height: 1.6;
  color: #222;
}

h1 {
  font-size: 6rem;
  font-weight: 700;
  line-height: 6.5rem;
  text-align: center;
  color: black;
}
h2 {
  font-size: 2.5rem;
  font-weight: 650;
  line-height: 2.9rem;
  padding-top: 16px;
  padding-bottom: 8px;
}
h3 {
  font-size: 2rem;
  font-weight: 600;
  line-height: 2.4rem;
  padding-top: 16px;
  padding-bottom: 8px;
}
p {
  font-size: 1.6rem;
  text-align: justify;
  padding-bottom: 1.3rem;
}
a { color: #125CCA; }
a:hover { color: #3BA3BB; }
li {
  list-style-position: inside;
}

header {
  position: relative;
  width: 100%;
  padding: 40px 0 65px;
  background-color: #50C878;
}

.toc {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.toc li {
  background-color: #DDE8EF;
  list-style-type: none;
  text-align: center;
}
.toc li:hover { background-color: #B3E1EF; }
.toc a {
  display: flex;
  width: 100%;
  height: 100%;
  padding: 4px 0;
  box-sizing: border-box;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  text-decoration: none;
  color: #464646;
}

hr {
  border-color: #dadada;
}

section {
  margin: 16px 0;
  padding: 0 24px;
}
section > * {
  max-width: 640px;
  margin: 0 auto;
}

img {
  display: block;
  margin: 0 auto;
  padding: 2rem 0;
  max-width: 100%;
  width: 640px;
}

#intro {
  padding-top: 100px;
}
#intro p {
  font-weight: 400;
  font-size: 1.8rem;
  line-height: 3rem;
  padding-top: 8px;
}

.logo {
  position: absolute;
  left: 50%;
  bottom: -15px;
  transform: translate(-50%, 50%);
  width: 180px;
  height: 180px;

  background-image: url("../img/android-chrome-512x512.png");
  background-size: contain;
  background-repeat: no-repeat;
}

table {
  width: 100%;
  margin-bottom: 20px;
  padding: 1rem 0;
  border-collapse: collapse;
}
table th,
table td {
  padding: 10px;
  line-height: 1.42857143;
  vertical-align: middle;
  border-bottom: 1px solid #ddd;
  text-align: center;
}
table > thead > tr > th {
  vertical-align: bottom;
  border-bottom: 2px solid #ddd;
}

#acknowledgements {
  display: flex;
  flex-flow: wrap;
  max-width: 640px;
  margin: 0 auto;
  align-items: end;
}
.acknowledgement {
  display: block;
}
.acknowledgement > img {
  width: 200px;
}
#logo-rub {
  width: 130px;
}

footer {
  border-top: 1px solid #ccc;
  padding: 8px 24px 0 24px;
}
.text-muted {
  font-size: 13px;
  color: #888;
}