:root {
  --bg: #ccc;
  --ink: #000;
  --link: #0000ee;
  --track: #999;
  --box: #dadada;
  --tile: 400px;   /* minimum tile width */
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 13px monospace;
}

main {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(var(--tile), 100%), 1fr));
  gap: 80px 40px;
  align-items: start;
  padding: 40px;
}

p { margin: 0; }

/* Intro sits on its own row, videos start underneath */
.intro {
  grid-column: 1 / -1;
  line-height: 1.7;
  max-width: 70ch;
}

/* Player */
.frame {
  position: relative;
  background: var(--box);
  cursor: pointer;
}

.frame video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.msg {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: .75rem;
}

.seek {
  appearance: none;
  display: block;
  width: 100%;
  height: 20px;
  margin: -8px 0 0;   /* the 4px track sits flush under the video */
  background: transparent;
  cursor: pointer;
}
.seek::-webkit-slider-runnable-track {
  height: 4px;
  border: 0;
  background: linear-gradient(to right, var(--ink) var(--p, 0%), var(--track) var(--p, 0%));
}
.seek::-webkit-slider-thumb {
  appearance: none;
  width: 6px;
  height: 16px;
  margin-top: -6px;
  border: 0;
  border-radius: 0;
  background: var(--ink);
}
.seek::-moz-range-track { height: 4px; border: 0; background: var(--track); }
.seek::-moz-range-progress { height: 4px; background: var(--ink); }
.seek::-moz-range-thumb { width: 6px; height: 16px; border: 0; border-radius: 0; background: var(--ink); }

/* Touch screens: a taller area to grab, same look */
@media (pointer: coarse) {
  .seek { height: 32px; margin-top: -14px; }
}

.bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0 1.25rem;
  margin-top: .15rem;
}
.bar > span {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
}

button {
  padding: .3rem 0;
  border: 0;
  background: none;
  color: var(--link);
  font: inherit;
  text-align: left;
  text-decoration: underline;
  text-underline-offset: .15em;
  cursor: pointer;
}
[data-act="play"] { min-width: 5ch; }

a:focus-visible,
button:focus-visible,
.seek:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 3px;
}

.broken .frame { cursor: default; }
.broken .seek,
.broken .bar { visibility: hidden; }

@media (max-width: 600px) {
  main { padding: 20px; gap: 56px 20px; }
}