* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

h1 {
    text-align: center;
    color: #2d3748;
    margin-bottom: 1.5rem;
    font-size: 2.5rem;
}

.status {
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: #4a5568;
    min-height: 1.5rem;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 1.5rem;
}

.cell {
    width: 100px;
    height: 100px;
    background-color: #fff;
    border: 2px solid #4a5568;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.cell:hover {
    background-color: #f7fafc;
    transform: scale(1.02);
}

.cell.x {
    color: #e53e3e;
}

.cell.o {
    color: #3182ce;
}

#restartButton {
    display: block;
    width: 100%;
    padding: 0.75rem;
    background-color: #4a5568;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

#restartButton:hover {
    background-color: #2d3748;
}