/* 背景（自分の後ろ）と画面の地 ― 2026年09月（bg.js） */
.bggrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:8px;margin:6px 0}
.bgb,.grb{display:flex;align-items:center;gap:8px;min-height:64px;padding:6px 8px;border:2px solid var(--line);border-radius:14px;background:#fff;color:var(--ink);font-size:17px;text-align:left;line-height:1.3;cursor:pointer}
.bgb.sel,.grb.sel{border:3px solid var(--ok);background:#eaf6ee;font-weight:bold}
.bgb:disabled,.bgb.dis{opacity:.45;cursor:default}
.bgi{flex:none;width:64px;height:40px;border-radius:8px;background:#ddd center/cover no-repeat;border:1px solid #0002}
.bgic{display:grid;place-items:center;font-size:24px;background:#f4eeeb}
.gri{flex:none;width:64px;height:40px;border-radius:8px;border:1px solid #0003;background:#1e1b22 center/cover no-repeat}
.bgn{min-width:0;overflow-wrap:anywhere}
.bgnote{border:2px solid #e0a800;background:#fffaf0;border-radius:12px;padding:8px 12px;font-size:17px;margin:4px 0}
html.plana .bgb,html.plana .grb{font-size:1.06rem}
html.plana .bgnote{font-size:1.1rem}
/* 地の見本と、実際の地（映像のまわり。白い文字が読める濃さ） */
.gr-dark{background:#1e1b22}
.gr-logo,html[data-ground=logo] :is(.stage,.smain,.lvid){background:#221d27 url(bg/g_logo.webp) center/cover}
.gr-spring,html[data-ground=spring] :is(.stage,.smain,.lvid){background:#2f1d2e url(bg/g_spring.webp) center/cover}
.gr-summer,html[data-ground=summer] :is(.stage,.smain,.lvid){background:#0f2f37 url(bg/g_summer.webp) center/cover}
.gr-autumn,html[data-ground=autumn] :is(.stage,.smain,.lvid){background:#361f16 url(bg/g_autumn.webp) center/cover}
.gr-winter,html[data-ground=winter] :is(.stage,.smain,.lvid){background:#1a2340 url(bg/g_winter.webp) center/cover}
.gr-soft,html[data-ground=soft] :is(.stage,.smain,.lvid){background:#5a4450 url(bg/g_soft.webp) center/cover}
/* 地の上では、映像の無いところ（四角の外）が見えるように、四角の中の黒い下地はそのまま */
html[data-ground]:not([data-ground=dark]) .sstage{background:transparent}