:root { color-scheme: light; font-family: "Yu Gothic UI", "Hiragino Kaku Gothic ProN", sans-serif; color: #444; background: #fff; }
* { box-sizing: border-box; }
body { margin: 0; }
main { max-width: 1080px; margin: auto; padding: 32px 24px; }
header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 30px; color: #506976; font-size: 14px; }
.brand { color: #223c46; font-family: Georgia, serif; font-size: 30px; font-weight: 700; text-decoration: none; }
.screen { overflow: hidden; background: #000; aspect-ratio: 16 / 9; }
video { display: block; width: 100%; height: 100%; object-fit: contain; }
h1 { font-size: clamp(24px, 4vw, 32px); font-weight: 600; margin: 0 0 8px; letter-spacing: .04em; }
p { line-height: 1.8; margin: 0; }
a { color: #265f79; text-underline-offset: 3px; }
a:focus-visible, video:focus-visible { outline: 3px solid #36758d; outline-offset: 4px; }
#playback-status { margin-top: 12px; font-size: 14px; }
#playback-status:empty { display: none; }
footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px 20px; margin-top: 12px; font-size: 11px; color: #666; }
pre { margin: 24px 0; padding: 20px; overflow-x: auto; border: 1px solid #c2d2d9; border-radius: 8px; background: white; font-size: 13px; line-height: 1.7; }
@media (max-width: 560px) { main { padding: 16px 12px; } header { margin-bottom: 20px; } }