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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 600px;
    width: 100%;
}

h1 {
    color: #333;
    margin-bottom: 20px;
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.game-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.current-player {
    font-size: 1.2em;
    font-weight: bold;
    color: #333;
}

#current-player {
    color: #e74c3c;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

.game-controls {
    display: flex;
    gap: 10px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    background: linear-gradient(45deg, #3498db, #2980b9);
    color: white;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.game-board {
    display: inline-block;
    background: #deb887;
    border: 3px solid #8b4513;
    border-radius: 10px;
    padding: 20px;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.1);
    margin: 20px 0;
}

.board-grid {
    display: grid;
    grid-template-columns: repeat(15, 30px);
    grid-template-rows: repeat(15, 30px);
    gap: 0;
    background: #deb887;
}

.cell {
    width: 30px;
    height: 30px;
    border: 1px solid #8b4513;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    position: relative;
    transition: background-color 0.2s ease;
}

.cell:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.cell.occupied {
    cursor: not-allowed;
}

.cell.occupied:hover {
    background-color: transparent;
}

.piece {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.piece.black {
    background: radial-gradient(circle at 30% 30%, #555, #000);
    border: 1px solid #333;
}

.piece.white {
    background: radial-gradient(circle at 30% 30%, #fff, #ddd);
    border: 1px solid #999;
}

.piece:hover {
    transform: scale(1.1);
}

.winning-piece {
    animation: pulse 1s infinite;
    box-shadow: 0 0 15px #f39c12;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.game-status {
    font-size: 1.3em;
    font-weight: bold;
    margin-top: 20px;
    min-height: 30px;
    color: #2c3e50;
}

.winner-announcement {
    color: #e74c3c;
    animation: bounce 0.6s ease-in-out;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    .game-info {
        flex-direction: column;
        gap: 10px;
    }
    
    .board-grid {
        grid-template-columns: repeat(15, 25px);
        grid-template-rows: repeat(15, 25px);
    }
    
    .cell {
        width: 25px;
        height: 25px;
    }
    
    .piece {
        width: 20px;
        height: 20px;
    }
}