/* Left-hand menu shared by chess.html and chess4.html */
#side{position:fixed;left:0;top:0;bottom:0;width:220px;background:var(--card);border-right:1px solid var(--bd);display:flex;flex-direction:column;z-index:40}
body.hasside main{margin:0 0 0 220px;max-width:none;padding-top:16px}
body.hasside>main>header{display:none}
.sbtop{display:flex;align-items:center;justify-content:space-between;padding:14px 14px 8px}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:20px;color:var(--fg);text-decoration:none;letter-spacing:-.01em}
.logo span{width:34px;height:34px;border-radius:9px;background:var(--ac);color:var(--bg);display:grid;place-items:center;font-size:22px}
#sbtog{display:none;background:transparent;color:var(--fg);font-size:22px;padding:4px 10px;border:1px solid var(--bd)}
.sbbody{flex:1;display:flex;flex-direction:column;overflow:auto;padding:4px 8px 10px}
.sbnew{display:block;width:calc(100% - 12px);margin:6px 6px 10px;padding:12px;font-size:16px;border-radius:10px;box-shadow:0 3px 0 rgba(0,0,0,.18)}
.sbh{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--mut);padding:12px 12px 4px}
.sbi{display:flex;align-items:center;gap:12px;width:100%;padding:10px 12px;margin:1px 0;background:none;color:var(--fg);border:0;border-radius:9px;font:600 15px/1.2 system-ui,sans-serif;text-align:left;text-decoration:none;cursor:pointer}
.sbi:hover{background:var(--soft)}
.sbi .ic{width:24px;text-align:center;font-size:19px;flex:none}
.sbi small{display:block;font-weight:500;font-size:12px;color:var(--mut);margin-top:1px}
.sbi.on{background:var(--soft);box-shadow:inset 3px 0 0 var(--ac)}
.sbi:disabled{opacity:.4;cursor:default;background:none}
.sbfoot{margin-top:auto;border-top:1px solid var(--bd);padding-top:6px}
/* people who opened an invite link: only the rules, nothing that starts or leaves a game */
body.guestview .sbbody>*{display:none}
body.guestview .sbbody>#hlp{display:flex}
body.guestview .sbbody>.sv-guest{display:block}
body.guestview .logo{pointer-events:none}
.sv-guest{display:none;font-size:13px;color:var(--mut);padding:8px 12px;line-height:1.4}
/* phones and narrow windows: a top bar with a ☰ button that opens the menu */
@media(max-width:900px){
 #side{position:sticky;top:0;bottom:auto;width:auto;height:auto;border-right:0;border-bottom:1px solid var(--bd)}
 .sbtop{padding:8px 12px}
 .logo{font-size:17px}.logo span{width:30px;height:30px;font-size:19px}
 #sbtog{display:block}
 .sbbody{display:none;position:fixed;left:0;right:0;top:51px;bottom:0;background:var(--card);padding:6px 12px 20px;box-shadow:0 12px 30px rgba(0,0,0,.25)}
 body.sbopen .sbbody{display:flex}
 body.hasside main{margin:0 auto;padding-top:8px}
}