* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
            padding: 20px;
        }

        .container {
            background-color: rgba(255, 255, 255, 0.95);
            border-radius: 20px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
            padding: 30px;
            text-align: center;
            max-width: 500px;
            width: 100%;
            backdrop-filter: blur(10px);
        }

        h1 {
            color: #2c3e50;
            margin-bottom: 15px;
            font-size: 2.8rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
            background: linear-gradient(45deg, #1a2a6c, #b21f1f);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .status {
            font-size: 1.6rem;
            font-weight: bold;
            margin: 20px 0;
            height: 40px;
            color: #2c3e50;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
        }

        .board {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-gap: 12px;
            margin: 25px auto;
            max-width: 320px;
        }

        .cell {
            background-color: #ecf0f1;
            border-radius: 12px;
            height: 100px;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 3.5rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            position: relative;
            overflow: hidden;
        }

        .cell:hover {
            background-color: #d6dbdf;
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }

        .cell.x {
            color: #e74c3c;
        }

        .cell.o {
            color: #3498db;
        }

        .controls {
            margin: 25px 0;
        }

        button {
            background: linear-gradient(to right, #3498db, #2c3e50);
            color: white;
            border: none;
            padding: 14px 30px;
            font-size: 1.2rem;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            font-weight: 600;
            letter-spacing: 0.5px;
        }

        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
        }

        button:active {
            transform: translateY(1px);
        }

        .winning-cell {
            animation: pulse 1.5s infinite;
            background-color: #2ecc71;
            color: white !important;
        }

        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        .scoreboard {
            display: flex;
            justify-content: space-around;
            margin: 25px 0;
            font-size: 1.3rem;
            font-weight: bold;
        }

        .score {
            padding: 12px 25px;
            border-radius: 12px;
            background-color: #ecf0f1;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
            min-width: 100px;
        }

        .x-score {
            color: #e74c3c;
            border-bottom: 4px solid #e74c3c;
        }

        .o-score {
            color: #3498db;
            border-bottom: 4px solid #3498db;
        }

        .draws {
            color: #7f8c8d;
            border-bottom: 4px solid #7f8c8d;
        }

        .footer {
            margin-top: 25px;
            color: #7f8c8d;
            font-size: 1rem;
            font-weight: 500;
        }

        .player-turn {
            display: inline-block;
            padding: 8px 20px;
            border-radius: 30px;
            background: linear-gradient(to right, #3498db, #2c3e50);
            color: white;
            font-weight: bold;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        }

        .player-x {
            background: linear-gradient(to right, #e74c3c, #c0392b);
        }

        .player-o {
            background: linear-gradient(to right, #3498db, #2980b9);
        }

        /* Responsive design */
        @media (max-width: 500px) {
            .container {
                padding: 20px;
            }
            
            h1 {
                font-size: 2.2rem;
            }
            
            .cell {
                height: 85px;
                font-size: 2.8rem;
            }
            
            .score {
                padding: 10px 15px;
                min-width: 80px;
                font-size: 1.1rem;
            }
        }