*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--panel: 220px;--gap: 20px;--board-size: min( calc(100vw - var(--panel) - var(--gap) * 3), calc(100vh - 36px - var(--gap) * 2) );--bg: #282828;--surface: #303030;--surface2: #383838;--border: #464646;--text: #ccc9c0;--dim: #777;--x: #b84040;--o: #c08838;--ring: #527840;--ring-dim: rgba(82,120,64,.25);--cell: #d4d0c8;--cell-h: #c2beb6;--dark-cell: #454545;--gap-col: #1c1c1c}body{font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);height:100vh;overflow:hidden}.app{height:100vh;display:flex;align-items:center;justify-content:center}.game-wrap{display:flex;flex-direction:column;gap:0}.game-header{display:flex;align-items:center;gap:8px;padding:0 4px 8px}.header-badge{width:22px;height:22px;border-radius:4px;background:var(--ring);display:grid;place-items:center;font-size:10px;font-weight:800;color:#fff;flex-shrink:0}.header-title{font-size:11px;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--dim)}.game-body{display:flex;gap:var(--gap);align-items:flex-start}.board-area{flex:0 0 auto}#tictactoe-wrapper{width:var(--board-size);height:var(--board-size)}.board-outer{display:grid;width:100%;height:100%;grid-template:repeat(3,1fr) / repeat(3,1fr);gap:5px;padding:5px;background:var(--gap-col);border-radius:6px;box-shadow:0 2px 18px #0000008c}.board-inner{display:grid;width:100%;height:100%;grid-template:repeat(3,1fr) / repeat(3,1fr);gap:1px;background:var(--gap-col)}.board-outer>:nth-child(odd) .square-inactive{background:#484848}.board-outer>:nth-child(2n) .square-inactive{background:#404040}.board-outer>:nth-child(odd) .board-inner{background:#1a1a1a}.board-outer>:nth-child(2n) .board-inner{background:#1e1e1e}.square-active{background:var(--cell);border:none;padding:0;width:100%;height:100%;display:grid;place-items:center;cursor:pointer;box-shadow:inset 0 0 0 3px var(--ring);transition:background .08s}.square-active:hover{background:var(--cell-h)}.square-inactive{background:var(--dark-cell);border:none;width:100%;height:100%;display:grid;place-items:center}.icon{width:62%;height:62%;display:flex;align-items:center;justify-content:center}.icon svg{width:100%;height:100%}.icon.icon-x svg{color:var(--x)}.icon.icon-o svg{color:var(--o)}.winner-icon{width:100%;height:100%;display:flex;align-items:center;justify-content:center}.winner-icon svg{width:68%;height:68%}.winner-icon.winner-x svg{color:var(--x)}.winner-icon.winner-o svg{color:var(--o)}.panel-area{flex:0 0 var(--panel);height:var(--board-size);display:flex;flex-direction:column}.side-panel{height:100%;background:var(--surface);border:1px solid var(--border);border-radius:6px;display:flex;flex-direction:column;padding:14px 12px;gap:12px}.panel-logo{font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--dim)}.panel-hr{border:none;border-top:1px solid var(--border);flex-shrink:0}.turn-indicator{display:flex;align-items:center;justify-content:space-between;padding:6px 0}.turn-label{font-size:11px;color:var(--dim)}.turn-piece{display:flex;align-items:center;gap:5px;font-size:12px;font-weight:700}.turn-piece svg{width:16px;height:16px}.turn-piece.piece-x{color:var(--x)}.turn-piece.piece-o{color:var(--o)}.turn-piece.piece-x svg{color:var(--x)}.turn-piece.piece-o svg{color:var(--o)}.local-controls{display:flex;flex-direction:column;gap:8px;flex:1}.nav-row{display:flex;align-items:center;gap:6px}.nav-btn{width:32px;height:30px;border:1px solid var(--border);background:var(--surface2);border-radius:4px;color:var(--text);cursor:pointer;display:grid;place-items:center;flex-shrink:0;transition:background .08s}.nav-btn:hover:not(:disabled){background:#444}.nav-btn:disabled{opacity:.28;cursor:default}.move-count{flex:1;text-align:center;font-size:11px;color:var(--dim);font-variant-numeric:tabular-nums}.reset-btn{width:100%;padding:8px;border:1px solid var(--border);background:transparent;border-radius:4px;color:var(--text);font-size:12px;cursor:pointer;transition:background .08s;margin-top:auto}.reset-btn:hover{background:var(--surface2)}.multiplayer-controls{display:flex;flex-direction:column;gap:6px;flex:1}.mp-btn{width:100%;padding:8px 10px;border:1px solid var(--border);background:transparent;border-radius:4px;color:var(--text);font-size:12px;text-align:left;cursor:pointer;transition:background .08s}.mp-btn:hover{background:var(--surface2)}.mp-btn.accept{border-color:#3d6030;color:#7ab05a;background:#3d60301f}.mp-btn.accept:hover{background:#3d60303d}.mp-btn.resign{border-color:#5a3030;color:#966060;margin-top:auto}.mp-btn.resign:hover{background:#78323226}.start-menu{display:flex;flex-direction:column;gap:10px;flex:1;justify-content:center}.start-description{font-size:11px;color:var(--dim);line-height:1.65}.start-btn{padding:9px 12px;background:var(--ring);border:none;border-radius:4px;color:#fff;font-size:12.5px;font-weight:600;cursor:pointer;transition:opacity .1s}.start-btn:hover{opacity:.85}.start-btn.secondary{background:transparent;border:1px solid var(--border);color:var(--text)}.start-btn.secondary:hover{background:var(--surface2);opacity:1}.invite-code-row{display:flex;align-items:center;gap:8px}.invite-code{font-size:28px;font-weight:800;letter-spacing:.18em;color:var(--text)}.copy-btn{padding:4px 8px;border:1px solid var(--border);background:transparent;border-radius:4px;color:var(--dim);font-size:11px;cursor:pointer;transition:color .1s,border-color .1s}.copy-btn:hover{color:var(--text);border-color:var(--text)}.code-input{width:100%;padding:8px 10px;background:var(--surface2);border:1px solid var(--border);border-radius:4px;color:var(--text);font-size:18px;font-weight:700;letter-spacing:.15em;text-transform:uppercase;text-align:center}.code-input:focus{outline:none;border-color:var(--ring)}.start-error{font-size:11px;color:#966060}.game-over{display:flex;flex-direction:column;align-items:center;gap:10px;flex:1;justify-content:center}.game-over-piece{width:48px;height:48px}.game-over-piece svg{width:100%;height:100%}.game-over-piece.piece-x svg{color:var(--x)}.game-over-piece.piece-o svg{color:var(--o)}.game-over-label{font-size:14px;font-weight:600}.piece-x{color:var(--x)}.piece-o{color:var(--o)}@media (max-width: 699px){:root{--panel: 100%;--board-size: min( calc(100vw - 16px) , calc(100vh - 116px) )}.app{align-items:flex-start;overflow-y:auto}.game-wrap{width:100%;padding:10px 8px;gap:10px}.game-header{padding:0 0 6px}.game-body{flex-direction:column;align-items:center;gap:10px}.panel-area{flex:0 0 auto;height:auto;width:100%}.side-panel{flex-direction:row;flex-wrap:wrap;align-items:center;padding:10px;gap:8px;height:auto}.turn-indicator{flex:1;min-width:100px;padding:0}.local-controls{flex-direction:row;align-items:center;flex:none;gap:6px}.local-controls .nav-row{gap:4px}.local-controls .reset-btn{width:auto;margin-top:0;padding:6px 10px}.panel-logo,.panel-hr{display:none}.start-menu{flex-direction:row;align-items:center;flex:1;justify-content:flex-start}.start-description{display:none}.start-btn{white-space:nowrap}.multiplayer-controls{flex-direction:row;flex-wrap:wrap;gap:5px;flex:1}.mp-btn{width:auto;padding:6px 10px}.mp-btn.resign{margin-top:0}.game-over{flex-direction:row;justify-content:flex-start;flex:1;gap:8px}.game-over-piece{width:32px;height:32px}}.snackbar-list{position:fixed;bottom:14px;right:14px;display:flex;flex-direction:column;align-items:flex-end;gap:6px;z-index:100}.snackbar{padding:8px 12px;border-radius:5px;color:#fff;font-size:12px;display:flex;align-items:center;gap:8px;box-shadow:0 2px 10px #0006;animation:snack-in .15s ease;max-width:260px}.snackbar-info{background:#285478}.snackbar-success{background:#2a5434}.snackbar-warning{background:#624818}.snackbar-error{background:#602424}.snackbar-close{background:none;border:none;color:inherit;cursor:pointer;opacity:.65;padding:0;font-size:13px;line-height:1}@keyframes snack-in{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}