<?xml version="1.0" encoding="utf-8"?>
<!-- 现代渐变活力风按钮背景 -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 阴影 -->
    <item 
        android:top="1dp"
        android:left="1dp">
        <shape android:shape="oval">
            <solid android:color="@color/shadow_light"/>
            <size android:width="48dp" android:height="48dp"/>
        </shape>
    </item>
    <!-- 渐变边框 -->
    <item 
        android:bottom="1dp"
        android:right="1dp">
        <shape android:shape="oval">
            <gradient
                android:type="linear"
                android:angle="135"
                android:startColor="#3A4A5A"
                android:centerColor="#4A5A6A"
                android:endColor="#5A6A7A" />
            <size android:width="48dp" android:height="48dp"/>
        </shape>
    </item>
    <!-- 主体 -->
    <item 
        android:top="2dp"
        android:bottom="2dp"
        android:left="2dp"
        android:right="2dp">
        <shape android:shape="oval">
            <solid android:color="@color/cold_silver"/>
            <size android:width="46dp" android:height="46dp"/>
        </shape>
    </item>
    <!-- 高光 -->
    <item 
        android:top="2dp"
        android:bottom="24dp"
        android:left="2dp"
        android:right="2dp">
        <shape android:shape="oval">
            <solid android:color="@color/texture_highlight"/>
            <size android:width="46dp" android:height="22dp"/>
        </shape>
    </item>
</layer-list>

