:root {
  --text-color: white;

  --main-bg-color: #18181a;
  --chat-bg-color: #232327;

  --border-width: 1px;
  --chat-width: 320px;

  --main-border: var(--border-width) solid #38383d;
  --chat-border: var(--border-width) solid #4a4a4f;

  --aspect-x: 16;
  --aspect-y: 9;

  --pure-video-height: calc(100vw * var(--aspect-y) / var(--aspect-x));
  --video-height: max(144px, min(75vh, var(--pure-video-height)));
}

body {
  margin: 0;
  background-color: var(--main-bg-color);
  color: var(--text-color);
  font-family: sans-serif;
  height: 100vh;
  display: grid;
  grid-auto-rows: var(--video-height) auto min-content 1fr auto;
  grid-template-areas:
    "stream"
    "toggle"
    "info"
    "chat"
    "footer";
}
a {
  color: #42a5d7;
}

#stream {
  background: black;
  width: 100%;
  height: var(--video-height);
  grid-area: stream;
}

#info {
  border-top: var(--main-border);
  box-sizing: border-box;
  padding: 0.75ch 1ch;
  overflow-y: scroll;
  grid-area: info;
}
#info__title {
  font-size: 18pt;
}

#chat {
  display: grid;
  grid-auto-rows: auto 1fr auto;
  background-color: var(--chat-bg-color);
  border-top: var(--chat-border);
  border-bottom: var(--chat-border);
  grid-area: chat;
  height: 50vh;
  min-height: 24ch;
}
#chat__header {
  text-align: center;
  padding: 1ch 0;
  margin-bottom: 1ch;
  border-bottom: var(--chat-border);
}
#chat-form {
  display: grid;
  grid-template: auto 2rem / auto 8ch;
  grid-gap: 0.75ch;
  margin: 1ch;
}
#chat-form__submit {
  grid-column: 2 / span 1;
}
#chat-form__message {
  grid-column: 1 / span 2;
  background-color: #434347;
  border-radius: 4px;
  border: 2px solid transparent;
  transition: 0.25s;
  max-height: 16ch;
  min-height: 2.25ch;
  padding: 1.5ch;
  color: #c3c3c7;
  resize: vertical;
}
#chat-form__message:not(:focus):hover {
  border-color: #737377;
}
#chat-form__message:focus {
  background-color: black;
  border-color: #3584e4;
}
#chat__messages {
  margin: 0 1ch;
  overflow-y: auto;
  position: relative;
}
#chat-messages {
  list-style: none;
  padding: 0;
  margin: 0;
  width: 100%;
  max-height: 100%;
  position: absolute;
  bottom: 0;
  font-size: 11pt;
}
.chat-message {
  padding: 0.5ch 0.75ch ;
  width: 100%;
  box-sizing: border-box;
  border-radius: 4px;
}
.chat-message:hover {
  background-color: #434347;
}
.chat-message__name {
  font-weight: bold;
  color: attr("data-color");
  cursor: default;
}
.chat-message__text {
  overflow-wrap: anywhere;
}
#chat-live {
  font-size: 9pt;
  line-height: 2rem;
}
#chat-live__ball {
  border: 4px solid maroon;
  border-radius: 4px;
  display: inline-block;
  margin-right: 2px;
  animation: 3s infinite glow;
}
@keyframes glow {
    0% {filter: brightness(100%)}
   50% {filter: brightness(150%)}
  100% {filter: brightness(100%)}
}

#toggle {
  grid-area: toggle;
  border-top: var(--main-border);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}
#toggle > a {
  text-align: center;
  padding: 1ch;
  font-variant: all-small-caps;
  text-decoration: none;
  color: inherit;
  background-color: #3674bf;
  border: 2px outset #3584e4;
}

footer {
  grid-area: footer;
  text-align: center;
  padding: 0.75ch;
  background: linear-gradient(#38383d, #1d1d20 16%);
  font-size: 9pt;
}

#info, #chat {
  display: none;
}
#info:target, #both:target > #info {
  display: block;
}
#chat:target, #both:target > #chat {
  display: grid;
}
#info:target ~ #toggle > [href="#info"],
#chat:target ~ #toggle > [href="#chat"],
#both:target > #toggle > [href="#both"] {
  background-color: #3065a6;
  border-style: inset;
}

@media (min-width: 720px) {
  :root {
    --pure-video-height: calc((100vw - var(--chat-width) - var(--border-width)) * var(--aspect-y) / var(--aspect-x));
  }
  body {
    grid-auto-rows: var(--video-height) 1fr auto;
    grid-auto-columns: 1fr 320px;
    grid-template-areas:
      "stream chat"
      "info chat"
      "footer chat";
  }
  #toggle {
    display: none;
  }
  #stream {
    height: var(--video-height);
  }
  #info {
    display: block;
  }
  #chat {
    display: grid;
    border: none;
    border-left: var(--chat-border);
    min-height: 100vh;
  }
}