/* 按钮样式 */
.back-home {
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 1000;
    padding: 6px 12px;
    background: #01b0f1;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: bold;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
    transition: background 0.2s;
}
.back-home:hover {
    background: #1f8bff;
}

.control-btn {
    position: fixed;
    top: 10px;
    z-index: 1000;
    width: 40px;
    height: 40px;
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
    transition: background 0.2s;
}
.control-btn:disabled {
    background: #CCCCCC;
    cursor: not-allowed;
}
.control-btn:not(:disabled):hover {
    background: var(--hover-bg);
}

.help-button {
    right: 10px;
    background: #01b0f1;
    --hover-bg: #1f8bff;
}
.save-button {
    right: 60px;
    background: #FFA500;
    --hover-bg: #FF8C00;
}
.redo-button {
    right: 110px;
    background: #4CAF50;
    --hover-bg: #45a049;
}
.undo-button {
    right: 160px;
    background: #FF6B6B;
    --hover-bg: #FF5252;
}

/* 方向控制按钮 */
.direction-controls {
    position: fixed;
    bottom: 10px;
    left: 0;
    right: 0;
    z-index: 1000;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px;
    pointer-events: none;
}

.direction-row {
    display: flex;
    justify-content: center;
    margin-bottom: 5px;
}

.direction-btn {
    width: 40px;
    height: 40px;
    margin: 5px;
    background-color: rgba(1, 176, 241, 0.8);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    transition: all 0.2s;
    touch-action: manipulation;
    user-select: none;
    pointer-events: auto;
}
.direction-btn:active {
    background-color: rgba(31, 139, 255, 0.9);
    transform: scale(0.95);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

/* 帮助提示框样式 */
#help-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    padding: 24px 30px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    text-align: center;
    width: 370px;
    line-height: 1.6;
    color: #333;
}

#help-container h2 {
    margin-top: 0;
    font-size: 22px;
    color: #01b0f1;
}
#help-container p {
    margin: 10px 0;
    font-size: 16px;
    text-align: left;
}
#help-container span {
    font-size: 22px;
}

.close-help-button {
    margin-top: 18px;
    padding: 10px 24px;
    font-size: 16px;
    cursor: pointer;
    background-color: #01b0f1;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    font-family: 'Segoe UI', 'Helvetica Neue', sans-serif;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}
.close-help-button:hover {
    filter: brightness(90%);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* 响应式设计 */
@media (max-width: 600px) {
    .back-home {
        font-size: 12px;
        padding: 5px 10px;
        top: 8px;
        left: 8px;
    }

    .control-btn {
        width: 35px;
        height: 35px;
        font-size: 20px;
        top: 8px;
    }
    .help-button {
        right: 8px;
    }
    .save-button {
        right: 48px;
    }
    .redo-button {
        right: 88px;
    }
    .undo-button {
        right: 128px;
    }

    /* 按钮仅在移动端显示 */
    .direction-controls {
        display: flex;
    }

    #help-container {
        padding: 20px;
        font-size: 15px;
        width: 300px;
    }
    #help-container h2 {
        font-size: 18px;
    }
    #help-container p {
        font-size: 14px;
    }

    .close-help-button {
        font-size: 15px;
        padding: 10px 20px;
        width: 100%;
    }
}