:root {
  --text-color: #333;
  --dark-background-color: #333;
  --light-background-color: #f7f7f7;
  --grey: #777;
  --lighter-orange: #ffb343;
  --light-orange: #ff9900;
  --orange: #a36100;
  --dark-orange: #804c00;
  --orange-background: #ff9900cc;
}

html {
  scroll-padding-top: 5rem;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Roboto Slab', serif;
  font-size: 1em;
  color: var(--text-color);
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  text-wrap: balance;
}

h2 {
  font-size: 2.5rem;
  text-align: center;
  text-transform: uppercase;
}

h3 {
  font-size: 1.6rem;
}

p {
  line-height: 1.75;
}

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

a:hover, a:focus, a:active {
  color: var(--dark-orange);
}

nav {
  background: var(--dark-background-color);
  display: flow-root;
  position: sticky;
  top: 0;
  z-index: 1;
  height: 5rem;
}

nav > ul {
  margin: 0 2rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  list-style: none;
  flex-wrap: wrap;
}

nav > ul > li {
  margin: 1rem;
}

nav > ul > li a {
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  font-size: 1.1rem;
  font-weight: 700;
  color: white;
  text-decoration: none;
}

nav > ul > li a:hover,
nav > ul > li a:focus {
  color: var(--light-orange);
}

nav > ul > li:first-child {
  flex: 1;
  margin-inline: 2rem;
}

nav > ul > li:first-child a {
  font-family: 'Kaushan Script', cursive;
  text-transform: none;
  color: var(--light-orange);
  font-weight: 400;
  font-size: 2rem;
}

header {
  background-image: url('/img/header-bg.webp');
  background-position: center center;
  background-size: cover;
  text-align: center;
  color: white;
  display: flow-root;
}

header > h1 {
  margin-top: 5rem;
  margin-bottom: 3rem;
  margin-inline: 2rem;
  font-size: 4.2rem;
  text-transform: uppercase;
}

header > h2 {
  margin-top: 3rem;
  margin-bottom: 3rem;
  margin-inline: 2rem;
  font-family: "Droid Serif", sans-serif;
  font-style: italic;
  text-transform: none;
  font-weight: 400;
  font-size: 2.8rem;
}

header > .links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1rem;
  margin-bottom: 3rem;
  margin-inline: 4rem;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  text-transform: uppercase;
}

header > .links > a {
  background: var(--orange);
  flex-shrink: 0;
  color: white;
  padding: 1rem 2rem;
  margin-inline: 1rem;
  text-decoration: none;
}

header > .links > a:hover {
  background: var(--dark-orange);
}

figure img {
  width: 100%;
  padding-bottom: 0.5rem;
}

figure figcaption {
  text-align: center;
  font-style: italic;
}

main section:nth-child(even) {
  background: var(--light-background-color);
}

main section div.section-wrapper {
  margin-inline: auto;
  padding: 1rem 2rem;
  max-width: 100ch;
  display: flow-root;
}

#hackfest .entry {
  display: flow-root;
}

#hackfest img {
  float: left;
  margin: 2rem;
  border-radius: 50%;
  border: solid thick var(--grey);
}

main section#talks div.section-wrapper {
  max-width: 170ch;
  text-align: center;
}

#talks .entry {
  width: min(40ch, 80%);
  max-width: 100%;
  display: inline-block;
  vertical-align: top;
  background: white;
  padding: 1rem;
  margin: 1rem;
  position:relative;
}

#talks .entry a.overlay {
  position: absolute;
  display: block;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  overflow: hidden;
  background: var(--orange-background);
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 0;
}

#talks .entry a.overlay.emoji {
  font-size: 5rem;
  color: white;
}

#talks .entry:hover a.overlay {
  height: 100%;
}

#talks a.overlay {
  text-decoration: none;
}

#talks .entry a {
  text-decoration: none;
}

#talks .entry h3 {
  margin: 0.5rem;
  color: var(--orange);
}

#talks .entry h4 {
  margin: 0;
}

#talks .entry div.cancelled {
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  font-weight: 700;
  margin: 1rem;
}

#talks .entry.cancelled,
#talks .entry.cancelled dialog {
  filter: grayscale(100%);
}

#talks img {
  border-radius: 50%;
  width: 10rem;
}

#talks dialog {
  padding: 2rem;
  max-width: 100ch;
}

#talks dialog img {
  float: left;
  margin: 2rem;
  width: 15rem;
}

#talks dialog .content p,
#talks dialog .content ul,
#talks dialog .content ol {
  text-align: left;
}

#talks dialog button {
  font-family: 'Montserrat', sans-serif;
  text-transform: uppercase;
  font-weight: 700;
  margin: 1rem;
  padding: 0.5rem 1rem;
}

#talks dialog button.close {
  float: right;
  padding: 0.5rem;
  margin-top: -1rem;
  margin-right: -1rem;
}

main section#attendees div.section-wrapper ul {
  column-count: 3;
}

main section#venue div.section-wrapper {
  max-width: 170ch;
  text-align: center;
}

main section#travel div.section-wrapper {
  max-width: 170ch;
  text-align: center;
}


#travel .entry {
  width: min(50ch, 90%);
  display: inline-block;
  vertical-align: top;
  text-align: left;
  padding-inline: 1rem;
  font-size: 0.9rem;
}

#travel h3 {
  text-align: center;
}

.emoji {
  font-family: 'Noto Emoji', sans-serif;
  font-weight: 700;
}

#travel .emoji {
  font-size: 3.5rem;
  display: block;
  color: white;
  background: var(--orange);
  border-radius: 50%;
  padding: 1rem;
  width: min-content;
  margin: auto;
}

main section#sponsors div.section-wrapper {
  max-width: 170ch;
  text-align: center;
  padding-bottom: 5rem;
}

#sponsors h3 {
  text-transform: uppercase;
  color: var(--grey);
}

#sponsors .entry {
  width: min(50ch, 90%);
  display: inline-block;
  margin: 1rem;
}

#sponsors .entry img {
  max-width: 100%;
}

#contact {
  text-align: center;
}

#contact h3 {
  color: var(--orange);
}

footer {
  color: white;
  background: var(--dark-background-color);
  padding: 1rem;
  text-align: center;
  font-size: small;
}

footer a {
  color: var(--light-orange);
}

footer a:hover, a:focus, a:active {
  color: var(--lighter-orange);
}

#sponsoring a {
  line-break: anywhere;
}

#sponsoring .sold {
  color: grey;
}

#sponsoring .sold a {
  color: grey;
}

@media (max-width: 1024px) {
  html {
    scroll-padding-top: 3rem;
  }

  nav {
    height: 3rem;
  }

  nav > ul {
    margin-inline: 1rem;
  }

  nav > ul > li {
    margin: 0.5rem;
  }
  nav > ul > li a {
    font-size: 0.75rem;
  }

  nav > ul > li:first-child a {
    font-size: 1.3rem;
  }

  header > h1 {
    font-size: 3rem;
    margin-block: 2rem;
  }

  header > h2 {
    font-size: 2rem;
    margin-top: 2rem;
    margin-block: 2rem;
  }

  header > .links {
    font-size: 1.2rem;
  }

  header > .links > a {
    padding: 0.5rem 1rem;
    margin-inline: 0;
  }

  #hackfest img {
    float: none;
    display: block;
    margin-inline: auto;
  }

  h2 {
    font-size: 2rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  #contact h3 {
    font-size: 1rem;
  }

  main section#attendees div.section-wrapper ul {
    column-count: 2;
  }

}

@media (max-width: 512px) {
  html {
    scroll-padding-top: 5.5rem;
  }

  nav {
    height: 5.5rem;
  }

  nav > ul {
    margin-inline: 0;
  }

  nav > ul > li:first-child {
    margin-top: 1rem;
    flex-basis: 100%;
    text-align: center;
  }

  #talks dialog img {
    float: none;
  }

  main section#attendees div.section-wrapper ul {
    column-count: 1;
  }

}