:root{--primary:#6366f1;--primary-dark:#4f46e5;--accent:#ec4899;--bg:#fff;--text:#1f2937;--border:#e5e7eb;--cell-bg:#f9fafb;--cell-hover:#f3f4f6;--win-highlight:#fef3c7}*,:before,:after{box-sizing:border-box}body{-webkit-font-smoothing:antialiased;background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.screen{flex-direction:column;align-items:center;min-height:100vh;padding:2rem 1rem;display:flex}.game-header{text-align:center;margin-bottom:2rem}.game-title{color:var(--primary);margin:0 0 .5rem;font-size:2.5rem;font-weight:700}.game-status{min-height:1.75rem;margin:0;font-size:1.25rem;font-weight:600}.current-player{color:var(--primary)}.winner{color:var(--accent)}.game-container{flex-direction:column;align-items:center;gap:2rem;display:flex}.board{background:var(--border);border-radius:.75rem;grid-template-columns:repeat(3,1fr);gap:.5rem;padding:.5rem;display:grid;box-shadow:0 4px 6px -1px #0000001a}.cell{background:var(--cell-bg);cursor:pointer;border:none;border-radius:.5rem;justify-content:center;align-items:center;width:100px;height:100px;font-size:3rem;font-weight:700;transition:all .2s;display:flex}.cell:hover:not(.cell-filled):not(.cell-disabled){background:var(--cell-hover);transform:scale(1.05)}.cell:active:not(.cell-filled):not(.cell-disabled){transform:scale(.98)}.cell-filled{cursor:default}.cell-disabled{cursor:not-allowed}.cell-x{color:var(--primary)}.cell-o{color:var(--accent)}.cell-winning{background:var(--win-highlight);animation:1s ease-in-out infinite pulse}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}.controls{gap:1rem;display:flex}.button{cursor:pointer;border:none;border-radius:.5rem;padding:.75rem 2rem;font-size:1rem;font-weight:600;transition:all .2s}.button-primary{background:var(--primary);color:#fff}.button-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 6px -1px #0000001a}.button-primary:active{transform:translateY(0)}.button-secondary{background:var(--border);color:var(--text)}.button-secondary:hover{background:#d1d5db;transform:translateY(-1px)}.button-secondary:active{transform:translateY(0)}.scoreboard{background:var(--cell-bg);border:2px solid var(--border);border-radius:.75rem;min-width:300px;padding:1.5rem}.scoreboard-title{text-align:center;margin:0 0 1rem;font-size:1.25rem;font-weight:700}.scores{grid-template-columns:repeat(2,1fr);gap:1rem;display:grid}.score-item{text-align:center;border:2px solid var(--border);background:#fff;border-radius:.5rem;padding:1rem}.score-label{text-transform:uppercase;margin:0 0 .25rem;font-size:.875rem;font-weight:600}.score-value{margin:0;font-size:2rem;font-weight:700}.score-item:first-child .score-label,.score-item:first-child .score-value{color:var(--primary)}.score-item:nth-child(2) .score-label,.score-item:nth-child(2) .score-value{color:var(--accent)}@media (width<=640px){.game-title{font-size:2rem}.cell{width:80px;height:80px;font-size:2.5rem}.scoreboard{min-width:260px}.controls{flex-direction:column;width:100%}.button{width:100%}}