:root {
  font-family: system-ui, sans-serif;
  color: #20304a;
  background: #f3f6fb;
  color-scheme: light dark;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 32px 16px;
}
main {
  max-width: 760px;
  margin: auto;
  background: #fff;
  padding: 32px;
  border: 1px solid #dce3ef;
  border-radius: 20px;
}
h1 {
  font-size: 28px;
  margin: 8px 0 12px;
}
p {
  line-height: 1.6;
}
.eyebrow {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #64748b;
  margin: 0;
}
label {
  display: block;
  margin: 16px 0 8px;
  font-size: 14px;
}
.row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
input {
  font: inherit;
  min-width: 0;
  flex: 1;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 10px 12px;
  background: #fff;
  color: inherit;
}
button {
  font: inherit;
  border: 1px solid #173ca7;
  border-radius: 8px;
  padding: 10px 16px;
  background: #2349b7;
  color: #fff;
  cursor: pointer;
}
button.secondary {
  background: transparent;
  border-color: #cbd5e1;
  color: inherit;
}
button:disabled {
  opacity: 0.5;
  cursor: default;
}
.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  flex: 1;
}
.toggle input {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  padding: 0;
}
.muted {
  font-size: 13px;
  color: #64748b;
}
.preview {
  aspect-ratio: 16/9;
  max-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #101827;
  border-radius: 12px;
  margin: 20px 0;
  color: #e2e8f0;
}
video {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
#message {
  padding: 12px;
  border-radius: 8px;
  background: #fff0f0;
  color: #9b2525;
}
[hidden] {
  display: none !important;
}
#source {
  font-family: Consolas, monospace;
  font-size: 13px;
}
@media (max-width: 480px) {
  body {
    padding: 16px 10px;
  }
  main {
    padding: 20px;
  }
  .row > input {
    flex-basis: 100%;
  }
}
@media (prefers-color-scheme: dark) {
  :root {
    color: #e2e8f0;
    background: #101723;
  }
  main,
  input {
    background: #182232;
    border-color: #36465e;
  }
  .muted,
  .eyebrow {
    color: #a9b8cd;
  }
  #message {
    background: #48252d;
    color: #fecaca;
  }
}