.offline-shell {font: 1rem/1.6 system-ui,sans-serif; color:#15372c; background:#f5f7f3; margin:0;}
.offline-shell main {box-sizing:border-box; max-width:40rem; margin:3rem auto; padding:1.5rem; overflow-wrap:anywhere;}
.offline-shell img {display:block; margin:auto; max-width:100%; height:auto;}
.offline-shell a {color:#15372c; text-decoration:underline;}
.shell-notice {box-sizing:border-box; margin:1rem; padding:1rem; border:1px solid #637e70; border-radius:.5rem; font:1rem/1.5 system-ui,sans-serif; overflow-wrap:anywhere;}
.shell-notice p {margin:.5rem 0;}
.shell-notice button {padding:.65rem 1rem; font:inherit;}
.shell-notice [hidden] {display:none;}