:root{--bg:#0f1115;--panel:#1a1d24;--border:#2a2e38;--text:#e6e9ef;--muted:#9aa3b2;--accent:#5b8cff;--accent-hover:#4878f0;--light:#ebecd0;--dark:#739552;--sel:#f6f669;--move:#ffff5a73;--check:#e85b5b}*{box-sizing:border-box}body{background:var(--bg);min-height:100vh;color:var(--text);flex-wrap:wrap;justify-content:center;align-items:flex-start;gap:24px;margin:0;padding:24px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;display:flex}h1{margin:0 0 4px;font-size:22px}p.sub{color:var(--muted);margin:0 0 18px;font-size:14px}.board-wrap{position:relative}.board{-webkit-user-select:none;user-select:none;touch-action:manipulation;border-radius:8px;grid-template-rows:repeat(8,1fr);grid-template-columns:repeat(8,1fr);width:min(78vw,560px);height:min(78vw,560px);display:grid;overflow:hidden;box-shadow:0 20px 60px #0006}.sq{cursor:pointer;justify-content:center;align-items:center;display:flex;position:relative}.sq.light{background:var(--light)}.sq.dark{background:var(--dark)}.sq.sel:after,.sq.lastmove:after{content:"";background:var(--move);pointer-events:none;position:absolute;inset:0}.sq.sel:after{background:var(--sel);opacity:.7}.sq.check{box-shadow:inset 0 0 0 4px var(--check);border-radius:4px}.piece{z-index:2;pointer-events:none;font-size:min(10vw,64px);line-height:1;position:relative}.piece.w{color:#fff;text-shadow:0 1px 1px #00000059,0 0 2px #00000080}.piece.b{color:#2b2b2b;text-shadow:0 1px 1px #ffffff26}.dot{z-index:1;background:#00000038;border-radius:50%;width:30%;height:30%;position:absolute}.dot.capture{box-sizing:border-box;background:0 0;border:6px solid #00000038;border-radius:50%;width:92%;height:92%}.coord{opacity:.55;z-index:3;pointer-events:none;font-size:10px;font-weight:700;position:absolute}.coord.file{bottom:1px;right:3px}.coord.rank{top:1px;left:3px}.light .coord{color:var(--dark)}.dark .coord{color:var(--light)}.panel{background:var(--panel);border:1px solid var(--border);border-radius:14px;width:260px;padding:18px}.status{min-height:22px;margin-bottom:14px;font-size:15px;font-weight:600}.status .turn-dot{vertical-align:middle;border:1px solid #888;border-radius:50%;width:10px;height:10px;margin-right:7px;display:inline-block}label{color:var(--muted);margin:12px 0 5px;font-size:12px;display:block}select{border:1px solid var(--border);width:100%;color:var(--text);background:#11141a;border-radius:9px;padding:8px 10px;font-family:inherit;font-size:13px}.btns{grid-template-columns:1fr 1fr;gap:8px;margin-top:16px;display:grid}button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:9px;padding:9px 10px;font-size:13px;font-weight:600;transition:background .15s}button:hover{background:var(--accent-hover)}button.sec{background:#2a2e38}button.sec:hover{background:#353a47}.moves{font-variant-numeric:tabular-nums;border-top:1px solid var(--border);max-height:260px;margin-top:16px;padding-top:10px;font-size:13px;overflow-y:auto}.moves .ply{border-radius:5px;min-width:64px;padding:2px 4px;display:inline-block}.moves .num{color:var(--muted);width:26px;display:inline-block}.moves .ply.last{background:#2a2e38}.captured{letter-spacing:1px;min-height:24px;margin-top:4px;font-size:20px;line-height:1.1}.promo{z-index:20;background:var(--panel);border:1px solid var(--border);border-radius:12px;gap:4px;padding:8px;display:none;position:absolute;box-shadow:0 12px 40px #00000080}.promo button{background:#11141a;width:56px;padding:4px 8px;font-size:34px}.promo button:hover{background:#262b35}.net{border-top:1px solid var(--border);margin-top:16px;padding-top:12px}.net summary{cursor:pointer;outline:none;margin-bottom:8px;font-size:13px;font-weight:600}.netStatus{color:var(--muted);margin-bottom:8px;font-size:12px}.netStatus.ok{color:#6cc070}.codebox{box-sizing:border-box;border:1px solid var(--border);width:100%;color:var(--text);letter-spacing:4px;text-align:center;text-transform:uppercase;background:#11141a;border-radius:8px;margin:6px 0;padding:9px 10px;font-family:ui-monospace,monospace;font-size:18px;font-weight:700}.codebox[readonly]{color:var(--accent);cursor:text}.codebox::placeholder{letter-spacing:normal;color:var(--muted);font-size:13px;font-weight:400}.join-row{align-items:center;gap:8px;display:flex}.join-row .codebox{flex:1}.join-row button{white-space:nowrap;width:auto}.nethint{color:var(--muted);margin-top:6px;font-size:11px;line-height:1.45}.credit{text-align:center;color:var(--muted);margin-top:16px;font-size:11px}.credit a{color:var(--accent);text-decoration:none}.credit a:hover{text-decoration:underline}