.board-nav{grid-column:1/-1;display:flex;gap:8px;margin:0 0 20px;padding:0 0 14px;border-bottom:1px solid var(--line)}
.board-nav a{display:grid;place-items:center;min-width:94px;min-height:44px;border-radius:8px;padding:10px 24px;font-size:16px;color:var(--muted);text-decoration:none}
.board-nav a[aria-current=page]{background:var(--blue,var(--accent));color:var(--nav-active-ink,#fff)}
.board-nav a:hover{background:var(--panel,#fff);color:var(--nav-hover-ink,var(--ink,var(--text)))}
.board-nav a[aria-current=page]:hover{background:var(--blue,var(--accent));color:var(--nav-active-ink,#fff)}
.board-lobby{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;max-width:920px;width:100%;margin:16px auto 48px}
.board-entry{display:flex;align-items:center;justify-content:center;min-height:150px;border:1px solid var(--line);border-radius:14px;background:var(--panel,#fff);color:inherit;font-size:22px;text-decoration:none;padding:24px}
.board-entry:hover{border-color:var(--blue,var(--accent));text-decoration:none}
.board-subnav{grid-column:1/-1;display:flex;align-items:center;gap:20px;margin-bottom:18px;font-size:14px;min-height:44px}
.board-subnav>a{color:var(--muted);white-space:nowrap}.board-subnav strong{font-weight:500}
.opening-modes,.endgame-modes{display:flex;gap:6px;flex-wrap:wrap}.opening-modes button,.endgame-modes button{min-height:44px;padding:8px 15px;font-size:14px}
#gameWorkspace{grid-column:1/-1;min-width:0}.xiangqi-workspace{display:grid;grid-template-columns:minmax(0,660px) minmax(0,380px);gap:0 28px}
body[data-board-kind=chess]:not([data-kind]){--nav-active-ink:#17291c}.engine-credit{grid-column:1/-1}
.chess-game .is-free-play .workspace{grid-template-columns:minmax(340px,600px) minmax(260px,360px);justify-content:center}
.is-free-play #library,.is-free-play .opening-library,.is-free-play .opening-detail,.is-free-play #random,.is-free-play .mobile-coach{display:none!important}
.is-free-play .progress,.is-free-play .track{display:none!important}
@media(max-width:800px){.xiangqi-workspace{grid-template-columns:1fr;gap:0}.board-lobby{gap:10px;margin-top:6px}.board-entry{min-height:115px;font-size:18px;padding:14px}.board-nav a{flex:1;min-width:0;padding:10px 12px}.board-subnav{gap:12px;flex-wrap:wrap}.opening-modes button,.endgame-modes button{padding:8px 12px}.chess-game .is-free-play .workspace{display:flex;flex-direction:column}.chess-game .is-free-play .workspace>*{width:100%}}
@media(max-width:400px){.board-lobby{grid-template-columns:1fr}.board-entry{min-height:76px}.board-nav{margin-bottom:14px}}