style.css

:root {
  --c-blue: #17eced;
  --c-blue-light: #17eced;
  --c-pink: #e72ee2;
  --c-primary: #333;
}

* {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
  font-size: 24px;
  font-size: 3vw;
  color: var(--c-primary);
  font-size: 36px;
  box-sizing: border-box;
}

* {
  font-size: 24px;
}

p {
  margin: 12px 0;
}

del {
  color: inherit;
  font-size: inherit;
}

html {
  min-height: 100vh;
  border-left: 8px solid var(--c-blue);
}

body {
  margin: 0 auto;
  max-width: 780px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--c-primary);
  font-weight: 600;
  border-radius: 2px;
}

a:hover {
  color: black;
  outline: 0;
}

p a {
  background: none;
}

.big a {
  padding: 24px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.big a:hover,
a.button:hover {
  background: white;
  outline: 2px solid black;
  color: black;
}

.big a {
  background: var(--c-blue);
}

.big a.alt-link {
  background: var(--c-pink);
  margin-left: 20px;
}

.button {
  font-weight: 600;
  border-radius: 2px;
  display: inline-block;
  margin: 0 auto;
  text-align: center;
  background: var(--c-pink);
  color: white;
  padding: 18px 48px;
}

h2 {
  line-height: 1;
  font-size: 40px;
}

main h3 {
  display: inline-block;
  font-size: 32px;
  line-height: 1;
  border-bottom: 2px solid var(--c-pink);
  box-shadow: inset 0px -6px 0 0px var(--c-pink);
  padding: 0 6px 0 4px;
  margin: 32px 0 16px 0;
}

header {
  display: grid;
  grid-template-columns: 0.6fr 1.4fr;
  grid-template-rows: 1fr 1fr;
  gap: 0px 0px;
  grid-auto-flow: row;
  grid-template-areas:
    'logo title'
    'logo subtitle';
  align-items: center;
  padding-top: 80px;
  padding-top: 40px;
}

header h1 {
  grid-area: logo;
  margin-right: 20px;
}

header h1 img {
  /* width: 215px;
  height: 215px; */
  width: 125px;
  height: 125px;
  display: block;
  margin: 0 auto;
}

header h2 {
  grid-area: title;
  padding-left: 4px;
}

header h3 {
  grid-area: subtitle;
  align-self: start;
  background: var(--c-blue);
  display: inline-block;
  width: fit-content;
  padding: 8px 8px;
}

main {
  padding-top: 40px;
  padding-left: 8px;
  flex-grow: 1;
}

ul,
.schedule li > div {
  margin-right: 4px;
}

main ul li {
  margin: 8px 0;
  list-style: none;
}

main ul.big li {
  list-style: none;
  line-height: 3;
  margin: 20px 0;
}

main ol li {
  margin: 24px 0 36px 0;
}

main h2 {
  border-bottom: 2px solid var(--c-blue);
  box-shadow: inset 0px -10px 0 0px var(--c-blue);
  padding-left: 4px;
  margin: 64px 0 16px 0;
}

main h2:first-child {
  margin-top: 0px;
}

footer {
  border-top: 2px solid var(--c-blue);
  padding: 12px;
  padding-bottom: 24px;
  margin-top: 64px;
}

footer ul {
  list-style: none;
}

footer ul a {
  background: none;
  font-size: 60%;
  padding: 0;
}

.cta {
  text-align: center;
  margin: 48px 0;
}

small {
  font-style: italic;
  font-size: 70%;
}

.speaker-details small {
  font-size: 75%;
}

small a {
  font-size: inherit;
}

output {
  font-family: monospace;
  /* font-variant-numeric: tabular-nums; */
}

.sponsors {
  margin-top: 64px;
  margin-right: 8px;
}

.sponsors a {
  display: flex;
  justify-content: center;
}

.sponsors img {
  max-width: 100%;
  object-fit: contain;
}

.sponsors.l2 ul {
  display: grid;
  grid-column-gap: 20px;
  grid-row-gap: 20px;
  align-items: start;
  grid-template-columns: 1fr 1fr;
  padding-bottom: 32px;
}

.sponsors.l3 ul {
  display: grid;
  grid-column-gap: 20px;
  grid-row-gap: 20px;
  align-items: start;
  grid-template-columns: 1fr 1fr;
}

.talks {
  position: relative;
}

.schedule img.avatar {
  width: 100px;
  height: 100px;
}

.talks ol {
  list-style: auto;
  margin-left: 24px;
}

.talks li {
  margin: 16px 0px;
  font-size: 18px;
}

.talks li a {
  display: block;
  margin-bottom: 4px;
}

.talks li a,
.talks li del {
  /* font-style: initial; */
  font-weight: normal;
  font-size: inherit;
}

.tag {
  font-size: 14px;
  background: var(--c-pink);
  color: white;
  outline: 2px solid var(--c-pink);
  padding-left: 4px;
  padding-right: 4px;
  margin-right: 8px;
}

@media screen and (min-width: 600px) {
  .talks li a {
    display: inline;
  }
  .tag {
    margin-left: 8px;
    margin-right: 0;
  }
}

.tag:before {
  content: '#';
}

.talks .talk-title {
  margin-right: 12px;
  font-style: normal;
  background-color: var(--c-pink);
  box-shadow: 0px 0px 0 9px var(--c-pink);
  box-decoration-break: clone;
  color: white;
  /* position: relative; */
}

.talks p {
  line-height: 1.4em;
}

.talk-title span {
  position: relative;
  color: white;
}

.talks .js-bg .talk-title {
  box-shadow: 0px 0px 0 9px var(--c-pink);
}

.talks .js-bg span {
  opacity: 0;
}

.talks .js-clone .talk-title {
  background: none;
  box-shadow: none;
}

.talks .js-clone {
  background: none;
  position: absolute;
  top: -24px;
  left: 0;
  width: 100%;
}

.talks {
  font-style: italic;
}

dd {
  margin-bottom: 24px;
}

.schedule ol {
  list-style: none;
}

.schedule li {
  display: block;
  align-items: start;
  margin: 8px 0;
}

.schedule time {
  float: left;
  margin: 0;
  font-size: 12px;
  color: white;
  padding: 12px 12px;
  background: var(--c-pink);
  margin-right: 12px;
  white-space: nowrap;
  display: block;
  width: fit-content;
  text-align: center;
  font-weight: 600;
}

.schedule .break time {
  display: inline;
  background: var(--c-blue);
  color: var(--c-primary);
}

@media screen and (min-width: 600px) {
  .schedule img.avatar {
    width: 160px;
    height: 160px;
  }

  .schedule li {
    display: flex;
    align-items: start;
    margin: 8px 8px 0 0;
  }

  .schedule time {
    float: none;
    display: inline-block;
  }
}

.schedule div {
  padding-top: 4px;
}

.schedule div.speaker-details {
  display: grid;
  grid-template:
    'a b b' 30px
    'a c c' auto
    'a c c' auto;
  grid-gap: 12px;
}

.schedule .speaker-details img.avatar {
  grid-area: a;
}

.schedule .speaker-details p {
  margin: 0;
}

.schedule .speaker-details p:first-of-type {
  grid-area: b;
}

.schedule .speaker-details p:first-of-type img {
  vertical-align: middle;
}

.schedule .speaker-details p:last-of-type {
  grid-area: c;
}

.schedule .speaker-details p:last-of-type strong {
  font-size: inherit;
}

.schedule strong,
.schedule span {
  font-size: 20px;
}

.schedule span {
  margin-top: 8px;
  font-size: 14px;
}

.schedule div p {
  font-size: 16px;
  line-height: 1.4;
}

.schedule .afterparty a {
  font-size: inherit;
}

.schedule .afterparty {
  line-height: 1.4;
}

.schedule .break {
  line-height: 1;
  margin-bottom: 20px;
  border-top: 2px solid var(--c-blue);
}

@media screen and (max-width: 599px) {
  .schedule .speaker-details * {
    font-size: 14px;
  }
}

@media screen and (min-width: 600px) {
  .schedule div > strong:first-of-type {
    margin-left: 0;
    display: inline-block;
  }

  .schedule strong {
    margin-left: 0;
    display: inline;
  }

  .schedule .break {
    border-top: 2px solid var(--c-blue);
    border-bottom: 2px solid var(--c-blue);
  }
}

.schedule li:not(.break) {
  border-top: 2px solid var(--c-pink);
  margin-bottom: 40px;
}

@media screen and (min-width: 440px) {
  header h2 {
    font-size: 11vw;
  }

  header h3 {
    font-size: 4.32vw;
  }

  header h1 img {
    width: 20vw;
    height: 20vw;
    max-width: 220px;
    max-height: 220px;
    display: block;
    margin: 0 auto;
  }
}

@media screen and (min-width: 600px) {
  .locations {
    display: grid;
    column-gap: 8px;
    grid-template-columns: auto auto;
  }
}

@media screen and (min-width: 1100px) {
  header h2 {
    font-size: 120px;
  }

  header h3 {
    font-size: 47px;
  }
}