:root {
  --text-color: #f7f7f7;
  --alt-text-color: #dfe3ee;
  --bg-color: #19232f;
  --alt-bg-color: rgb(19, 34, 57);
  --bg-translucent: rgba(85, 153, 255, 0.1);
  --theme-color: #b3cde0;
}

@media (prefers-color-scheme: light) {
  :root {
    --text-color: #222430;
    --alt-text-color: #222430;
    --bg-color: #f7f7f7;
    --alt-bg-color: #f7f7f7;
    --bg-translucent: rgba(19, 34, 57, 0.1);
    --theme-color: #d34a97;
  }
}

body {
  font-family: Helvetica, Lato, sans-serif;
  line-height: 1.5;
  font-weight: 300;
  font-size: 1.4em;
  color: var(--text-color);
  padding: 30px;
  margin-bottom: 150px;
  min-height: 100vh;
  background-color: var(--bg-color);
  background-position: bottom 0 left 2em;
  background-image: url("ado_dwc.png");
  background-repeat: no-repeat;
  background-size: 40%;
}

h1 {
  background-image: linear-gradient(
    to right,
    var(--text-color) 50%,
    var(--alt-text-color) 100%
  );
  background-clip: text;
  color: transparent;
  font-weight: 300;
}

h2 {
  font-weight: 300;
}

@media only screen and (min-width: 768px) {
  body {
    background-size: 15%;
  }
}

@media only screen and (min-width: 768px) {
  .container {
    display: grid;
    grid-template-columns: 0 2.5fr 0.5fr 1fr;
  }
}

header,
.container {
  max-width: 1140px;
  margin: 0 auto;
}

a {
  color: var(--theme-color);
}

header {
  color: var(--text-color);
  text-align: right;
}

img {
  max-width: 100%;
  height: auto;
}

article {
  padding-bottom: 3em;
}

article img {
  float: right;
}

@media only screen and (max-width: 768px) {
  article img {
    float: initial;
  }
}

footer {
  text-align: center;
}

.tab input {
  position: absolute;
  opacity: 0;
  z-index: -1;
}
.tab__content {
  max-height: 0;
  overflow: hidden;
  transition: all 0.35s;
}
.tab input:checked ~ .tab__content {
  max-height: initial;
}

/* Visual styles */
.accordion {
  color: var(--text-color);
  border-radius: 0.5rem;
  overflow: hidden;
}
.tab__label,
.tab__close {
  display: flex;
  color: var(--alt-text-color);
  background: var(--bg-translucent);
  font-weight: 500;
  cursor: pointer;
}
.tab__label {
  justify-content: space-between;
  padding: 0.75rem 1.2rem 0.5rem 1.2rem;
}
.tab__label::after {
  content: "\276F";
  width: 1em;
  height: 1em;
  text-align: center;
  transform: rotate(90deg);
  transition: all 0.35s;
}
.tab input:checked + .tab__label::after {
  transform: rotate(270deg);
}
.tab__content p {
  margin: 1rem 0;
  padding: 1rem;
}