body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #1e1e1e; /* Dark background */
    color: #ffffff; /* Light text */
}

#app {
    text-align: center;
    background-color: #2d2d2d; /* Dark container background */
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    width: 90%;
    max-width: 800px;
}

.header {
    background-color: #333333; /* Dark header background */
    color: #ffffff; /* Light text */
    padding: 20px;
    font-size: 24px;
    border-radius: 5px 5px 0 0;
}

.main {
    padding: 20px;
}

.game-controls {
    margin-bottom: 20px;
}

.game-controls input {
    padding: 10px;
    margin-right: 10px;
    border: 1px solid #555555; /* Dark border */
    border-radius: 5px;
    background-color: #444444; /* Dark input background */
    color: #ffffff; /* Light text */
}

.game-controls button {
    padding: 10px 20px;
    background-color: #555555; /* Dark button background */
    color: #ffffff; /* Light text */
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.game-controls button:hover {
    background-color: #777777; /* Lighter hover background */
}

.board {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.row {
    display: flex;
}

.cell {
    width: 30px;
    height: 30px;
    border: 1px solid #555555; /* Dark border */
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    cursor: pointer;
    background-color: #444444; /* Dark cell background */
    color: #ffffff; /* Light text */
}

.cell.revealed {
    background-color: #666666; /* Darker revealed cell background */
}

.cell.mine {
    background-color: #ff4d4d; /* Red mine background */
}

.footer {
    background-color: #333333; /* Dark footer background */
    color: #ffffff; /* Light text */
    padding: 10px;
    font-size: 14px;
    border-radius: 0 0 5px 5px;
    margin-top: 20px;
}

/* 新增的游戏说明样式 */
.game-instructions {
    margin-bottom: 20px;
    padding: 15px;
    background-color: #3d3d3d; /* 暗色背景 */
    border: 1px solid #555555; /* 暗色边框 */
    border-radius: 5px;
    color: #ffffff; /* 浅色文字 */
}

.game-instructions h2 {
    margin-top: 0;
    font-size: 20px;
    color: #ffffff; /* 浅色标题 */
}

.game-instructions p {
    margin: 10px 0;
}

.game-instructions ul {
    padding-left: 20px;
    list-style-type: square; /* 使用方块作为列表符号 */
    color: #ffffff; /* 浅色文字 */
}

.game-instructions ul ul {
    list-style-type: circle; /* 二级列表使用圆圈符号 */
    margin-top: 5px;
}

.game-instructions strong {
    color: #ffcc00; /* 强调文字使用亮黄色 */
}