/* 独立覆盖层，不占用游戏布局。 */
#fb-browser[hidden]{display:none!important}
#fb-browser{box-sizing:border-box;position:fixed;z-index:2147483000;inset-inline:16px;top:auto;bottom:max(16px,env(safe-area-inset-bottom));width:auto;max-width:420px;margin:0 auto;padding:22px;border:1px solid #d1d5db;border-radius:14px;background:#fff;color:#19232d;box-shadow:0 12px 48px #0005;max-height:75dvh;overflow:auto;overscroll-behavior:contain;text-align:start;font:15px/1.6 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;letter-spacing:normal;text-transform:none}
#fb-browser *{box-sizing:border-box}
#fb-browser h2{font:600 23px/1.25 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;margin:0;padding:0;padding-inline-end:32px;color:#19232d;letter-spacing:normal;text-transform:none}
#fb-browser p{margin:12px 0 16px;padding:0;font:14px/1.6 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:#46515d}
#fb-browser .fb-dismiss{position:absolute;inset-inline-end:4px;top:4px;width:44px;height:44px;border:0;border-radius:6px;padding:0;background:transparent;color:#19232d;font-size:26px;cursor:pointer}
#fb-browser .lp-btn{display:flex;align-items:center;justify-content:center;width:100%;min-height:48px;padding:12px 16px;border:1px solid #2059b5;border-radius:8px;background:#2059b5;color:white;text-decoration:none;text-align:center;font:600 14px/1.5 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;cursor:pointer}
#fb-browser .lp-btn-ghost{background:#fff;color:#19232d;border-color:#bbc2ca}
#fb-browser summary{padding:14px 0;cursor:pointer;font-size:14px}
#fb-browser label{display:block;margin:12px 0 6px;font-size:13px}
#fb-browser input{display:block;width:100%;padding:10px;border:1px solid #bbc2ca;border-radius:5px;background:white;color:#19232d;font-size:16px}
#fb-browser :focus-visible{outline:3px solid #2059b5;outline-offset:3px}