:root{color-scheme:light;--bg:#f7f8fb;--fg:#161a22;--card:#fff;--accent:#0078d4}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at top,#eaf2ff 0,var(--bg) 45%);color:var(--fg);font-family:Segoe UI,Helvetica,Arial,sans-serif}main{max-width:880px;margin:0 auto;padding:32px 20px}.card{background:var(--card);border:1px solid #dbe1ed;border-radius:12px;padding:20px;margin-top:20px}a.button,button.button{display:inline-block;color:#fff;background:var(--accent);border:0;cursor:pointer;text-decoration:none;padding:10px 14px;border-radius:8px}button.button:disabled{opacity:.55;cursor:not-allowed}code{background:#edf1fa;border-radius:6px;padding:1px 6px}