body{margin:0;background:#fff}.page{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.5rem;height:100vh;background:#fff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;transition:background .2s ease,color .2s ease}.page h1{color:#1a1a1a;font-size:2rem;font-weight:600;margin:0}.page.dark{background:#121212}.page.dark h1{color:#f5f5f5}.toggle{position:absolute;top:1.5rem;right:1.5rem;padding:.5rem 1rem;border-radius:999px;border:1px solid #d0d0d0;background:#f5f5f5;color:#1a1a1a;font-size:.875rem;cursor:pointer;transition:background .2s ease,color .2s ease,border-color .2s ease}.page.dark .toggle{border-color:#444;background:#1e1e1e;color:#f5f5f5}