html,body.shell{height:100%}
body.shell{margin:0;padding:14px;gap:12px;display:flex;flex-direction:column;overflow:hidden;background:linear-gradient(180deg,#cfe1ff,#e6efff)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) body.shell{background:linear-gradient(180deg,#0f1b34,#0b1220)}}
body.shell .gh{position:relative;flex:none;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.stage{flex:1;min-height:0;position:relative;border-radius:20px;overflow:hidden;border:1px solid var(--line);background:var(--bg);box-shadow:var(--shadow)}
.stage iframe{position:absolute;left:0;top:0;width:100%;height:100%;border:0;background:var(--bg);color-scheme:light dark}
.stage iframe[hidden]{display:none}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media(max-width:700px){body.shell{padding:8px;gap:8px}}
@media print{.gh{display:none!important}.stage iframe[hidden]{display:none!important}}