:root{--primary-color:#6366f1;--secondary-color:#ec4899;--success-color:#10b981;--warning-color:#f59e0b;--danger-color:#ef4444;--dark-color:#1f2937;--light-color:#f9fafb;--border-color:#e5e7eb;--shadow-sm:0 1px 2px 0 rgba(0,0,0,.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05);--shadow-xl:0 20px 25px -5px rgba(0,0,0,.1),0 10px 10px -5px rgba(0,0,0,.04)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem;color:var(--dark-color)}.game-container{background:#fff;border-radius:24px;padding:2rem;box-shadow:var(--shadow-xl);max-width:500px;width:100%;text-align:center;position:relative;overflow:hidden}.game-container:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary-color),var(--secondary-color))}.game-header{margin-bottom:2rem}.game-title{font-size:2.5rem;font-weight:800;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:1rem}.current-player{display:flex;gap:.5rem;font-size:1.1rem;color:var(--dark-color);opacity:.8}.current-player,.player-indicator{align-items:center;justify-content:center}.player-indicator{display:inline-flex;width:2rem;height:2rem;border-radius:50%;font-weight:700;font-size:1.2rem;color:#fff;animation:pulse 2s infinite}.player-indicator.X{background:var(--danger-color)}.player-indicator.O{background:var(--primary-color)}.game-board{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:.75rem;gap:.75rem;margin-bottom:2rem;max-width:300px;margin-left:auto;margin-right:auto}.board-cell{aspect-ratio:1;background:var(--light-color);border:2px solid var(--border-color);border-radius:16px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.board-cell.clickable:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--primary-color);background:#fff}.board-cell.clickable:active{transform:translateY(-2px)}.board-cell.X{background:linear-gradient(135deg,var(--danger-color),#dc2626);border-color:var(--danger-color);cursor:not-allowed}.board-cell.O{background:linear-gradient(135deg,var(--primary-color),#4f46e5);border-color:var(--primary-color);cursor:not-allowed}.cell-content{font-size:3rem;font-weight:900;color:#fff;animation:popIn .3s cubic-bezier(.68,-.55,.265,1.55)}.game-over .board-cell{opacity:.7;transform:scale(.98)}.game-result{animation:slideUp .5s cubic-bezier(.4,0,.2,1)}.result-message{margin-bottom:1.5rem}.draw-message,.winner-message{display:flex;align-items:center;justify-content:center;gap:.75rem;font-size:1.5rem;font-weight:700}.draw-icon,.winner-icon{font-size:2rem;animation:bounce 1s infinite}.winner-text.X{color:var(--danger-color)}.winner-text.O{color:var(--primary-color)}.draw-message{color:var(--warning-color)}.reset-button{background:linear-gradient(135deg,var(--success-color),#059669);color:#fff;border:none;padding:1rem 2rem;border-radius:12px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;align-items:center;gap:.5rem;margin:0 auto;box-shadow:var(--shadow-md)}.reset-button:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.reset-button:active{transform:translateY(0)}.button-icon{font-size:1.2rem;animation:spin 2s linear infinite}.game-instructions{color:var(--dark-color);opacity:.7;font-style:italic;margin-top:1rem}@keyframes popIn{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}@keyframes bounce{0%,20%,50%,80%,to{transform:translateY(0)}40%{transform:translateY(-10px)}60%{transform:translateY(-5px)}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}@media (max-width:640px){.game-container{padding:1.5rem;margin:1rem;border-radius:20px}.game-title{font-size:2rem}.game-board{gap:.5rem;max-width:280px}.board-cell{border-radius:12px}.cell-content{font-size:2.5rem}.draw-message,.winner-message{font-size:1.25rem;flex-direction:column;gap:.5rem}.draw-icon,.winner-icon{font-size:1.5rem}.reset-button{padding:.875rem 1.5rem;font-size:1rem;width:100%;justify-content:center}}@media (max-width:480px){.game-container{padding:1rem;margin:.5rem}.game-title{font-size:1.75rem}.game-board{max-width:260px}.cell-content{font-size:2rem}.current-player{font-size:1rem}.player-indicator{width:1.75rem;height:1.75rem;font-size:1rem}}@media (prefers-color-scheme:dark){.game-container{background:#1f2937;color:#fff}.board-cell{background:#374151;border-color:#4b5563}.board-cell.clickable:hover{background:#4b5563}.current-player,.game-instructions{color:#d1d5db}}