:root{ --bg:#f6f9fb; --card:#ffffff; --accent:#246bff; --text:#111827 }
html,body{height:100%;margin:0;font-family:Inter,system-ui,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}
.wrap{max-width:720px;margin:10vh auto;padding:28px;background:var(--card);border-radius:12px;box-shadow:0 6px 20px rgba(16,24,40,0.08);text-align:center}
h1{margin:0 0 12px;font-size:1.4rem}
.btn{background:var(--accent);color:white;border:none;padding:12px 18px;border-radius:8px;font-size:1rem;cursor:pointer}
.note{margin-top:12px;color:#4b5563;font-size:0.9rem}
code{background:#f3f4f6;padding:2px 6px;border-radius:4px}