:root{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color-scheme:light dark}*{box-sizing:border-box}body{margin:0;background:var(--tg-theme-bg-color, #17212b);color:var(--tg-theme-text-color, #ffffff)}.app{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:24px;gap:8px}.app h1{font-size:2rem;margin:0}.subtitle{margin:0;opacity:.7;color:var(--tg-theme-hint-color, #aaaaaa)}