:root{color-scheme:dark;--bg: #0c0d10;--fg: #f2f3f5;--muted: #8b8f99;--accent: #6cb6ff}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:Inter,-apple-system,BlinkMacSystemFont,Hiragino Sans,Noto Sans JP,sans-serif;min-height:100vh}#app{max-width:1100px;margin:0 auto;padding:1.5rem;display:flex;flex-direction:column;gap:1.5rem}.app-header h1{margin:0;font-weight:600;letter-spacing:.02em}.app-header .tagline{margin:.25rem 0 0;color:var(--muted);font-size:.9rem}.player-shell{background:#000;border-radius:12px;overflow:hidden;aspect-ratio:16 / 9;display:flex;align-items:center;justify-content:center}.player-shell video{width:100%;height:100%;display:block}.app-footer{color:var(--muted);font-size:.8rem;text-align:right}