body {
  margin: 0;
}
* {
  box-sizing: border-box;
}
main {
  display: grid;
  width: 100%;
  height: 100vh;
  grid-template-areas:
    "header"
    "player" 
    "controls"
    "transcript"
  ;
  grid-gap: 1rem;
  overflow: hidden;
  padding: 0.5rem;
}

header {
  grid-area: header;
  text-align: center;
  font-family: sans-serif;
}
header h1 {
  margin: 0;
}

#player {
  grid-area: player;
  position: relative;
  padding-bottom: calc(900%/16);
}
#player iframe {
  width: 100%;
  height: 100%;
  position: absolute;
}

#transcript {
  grid-area: transcript;
  overflow-y: scroll;
}

#controls {
    grid-area: controls;
}

.transcript-paragraph {
  display: grid;
  grid-auto-flow: column;
  grid-template-columns: min-content 1fr;
  margin: 1em 0;
  grid-gap: 0.5em;
  border: 1px solid transparent;
  padding: 0.2rem;
}

.transcript-paragraph > p {
  margin: 0;
}

.transcript-paragraph.active {
    border-color: #555;
}

@media screen and (orientation: landscape) {
  main {
    grid-template-areas: 
      "header header"
      "player transcript"
      "controls transcript";
    grid-template-columns: 1fr 25rem;
    grid-template-rows: auto 1fr auto;
  }
  header h1 {
    margin-bottom: 1em;
  }

  #player {
    padding-bottom: 0;
    padding-right: 100%;
  }
  
  .transcript-paragraph {
    grid-auto-flow: rows;
    grid-template-columns: 1fr;
    grid-template-rows: min-content 1fr;
  }
}