.game-container{display:flex;justify-content:center;align-items:center;padding:2rem 0}.sn-footer{display:none}.app{--bg: #F9FAFB;--surface: #FFFFFF;--border: #E5E7EB;--border-subtle: #F3F4F6;--text: #111827;--text-2: #6B7280;--text-3: #9CA3AF;--accent: oklch(.52 .22 254);--accent-hover: oklch(.45 .22 254);--accent-soft: oklch(.97 .03 254);--accent-mid: oklch(.9 .06 254);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08), 0 2px 4px rgba(0, 0, 0, .04);--font: "IBM Plex Sans", system-ui, sans-serif;--mono: "IBM Plex Mono", monospace;--cell: 88px;--gap: 10px;--board: calc(var(--cell) * 4 + var(--gap) * 5);display:flex;flex-direction:column;align-items:center}@keyframes tileAppear{0%{transform:scale(.4);opacity:0}60%{transform:scale(1.06)}to{transform:scale(1);opacity:1}}@keyframes tileMerge{0%{transform:scale(1)}40%{transform:scale(1.14)}to{transform:scale(1)}}@keyframes scoreUp{0%{transform:translateY(0);opacity:1}to{transform:translateY(-28px);opacity:0}}.header{width:var(--board);margin-bottom:20px}.header-row{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:16px}.title{font-family:var(--mono);font-size:40px;font-weight:600;letter-spacing:-.04em;color:var(--text);line-height:1}.subtitle{font-size:12px;color:var(--text-2);margin-top:4px}.subtitle .num{font-family:var(--mono);color:var(--accent)}.scores{display:flex;gap:8px;align-items:flex-start}.score-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:8px 16px;text-align:center;min-width:72px;position:relative;overflow:visible;box-shadow:var(--shadow-sm)}.score-label{font-size:10px;font-weight:600;letter-spacing:.08em;color:var(--text-3);text-transform:uppercase;margin-bottom:2px}.score-value{font-family:var(--mono);font-size:18px;font-weight:600;color:var(--text);letter-spacing:-.02em}.score-delta{position:absolute;top:-4px;right:4px;font-family:var(--mono);font-size:13px;font-weight:600;color:var(--accent);pointer-events:none;animation:scoreUp .6s ease-out both}.actions{display:flex;justify-content:flex-end}.btn-primary{font-family:var(--font);font-size:12px;font-weight:500;padding:6px 14px;background:var(--text);color:#fff;border:none;border-radius:var(--radius-sm);cursor:pointer;letter-spacing:.02em;transition:opacity .15s}.btn-primary:hover{opacity:.8}.board{position:relative;width:var(--board);height:var(--board);background:#e5e7eb;border-radius:var(--radius-lg);padding:var(--gap);display:grid;grid-template-columns:repeat(4,var(--cell));grid-template-rows:repeat(4,var(--cell));gap:var(--gap);-webkit-user-select:none;-moz-user-select:none;user-select:none;touch-action:none;box-shadow:var(--shadow-sm)}.tile{width:100%;height:100%;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md);font-family:var(--mono);font-weight:600;letter-spacing:-.03em;transition:background .1s;-webkit-user-select:none;-moz-user-select:none;user-select:none;line-height:1}.tile-appear{animation:tileAppear .18s ease-out both}.tile-merge{animation:tileMerge .18s ease-out both}.overlay{position:absolute;inset:0;background:#f9fafbe0;border-radius:var(--radius-lg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;backdrop-filter:blur(2px);z-index:10}.overlay-title{font-size:28px;font-weight:600;letter-spacing:-.02em;color:var(--text)}.overlay-title.won{color:var(--accent)}.overlay-sub{font-size:14px;color:var(--text-2)}.overlay-actions{display:flex;gap:8px}.btn-soft{font-family:var(--font);font-size:13px;font-weight:500;padding:8px 18px;background:var(--accent-soft);color:var(--accent);border:1px solid var(--accent-mid);border-radius:var(--radius-sm);cursor:pointer;transition:opacity .15s}.btn-soft:hover{opacity:.85}.btn-dark{font-family:var(--font);font-size:13px;font-weight:500;padding:8px 18px;background:var(--text);color:#fff;border:none;border-radius:var(--radius-sm);cursor:pointer;transition:opacity .15s}.btn-dark:hover{opacity:.85}.hint{margin-top:16px;font-size:12px;color:var(--text-3);text-align:center}@media(max-width:480px){.app{--cell: 64px;--gap: 8px}.title{font-size:32px}}