:root{--bg:#f7f8fa;--fg:#0f172a;--muted:#475569;--accent:#1d4ed8;--accent-fg:#fff;--line:#e2e8f0}
@media (prefers-color-scheme:dark){:root{--bg:#0b1220;--fg:#e5e7eb;--muted:#94a3b8;--accent:#60a5fa;--accent-fg:#0b1220;--line:#1e293b}}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;display:flex;flex-direction:column;min-height:100vh}
main{flex:1;display:flex;flex-direction:column;justify-content:center;width:100%;max-width:44rem;margin:0 auto;padding:4rem 1.5rem}
.mark{display:flex;align-items:center;gap:.6rem;font-weight:600;letter-spacing:.02em;color:var(--muted);font-size:.95rem;margin-bottom:2.5rem}
.mark span{display:inline-grid;place-items:center;width:2rem;height:2rem;border-radius:.5rem;background:var(--accent);color:var(--accent-fg);font-weight:700}
h1{font-size:clamp(2rem,5vw,3rem);line-height:1.15;margin:0 0 1rem;letter-spacing:-.02em}
.lede{font-size:1.15rem;color:var(--muted);margin:0 0 2rem}
.btn{display:inline-block;padding:.75rem 1.25rem;border-radius:.5rem;background:var(--accent);color:var(--accent-fg);text-decoration:none;font-weight:600}
.btn:hover,.btn:focus-visible{filter:brightness(1.1)}
.note{margin:1.25rem 0 0;color:var(--muted);font-size:.95rem;overflow-wrap:anywhere}
a{color:var(--accent)}
footer{border-top:1px solid var(--line);padding:1.25rem 1.5rem;text-align:center;color:var(--muted);font-size:.85rem}