.network_background {
    /* 深蓝→浅蓝渐变，和顶部导航栏蓝色统一配色 */
	   background: linear-gradient(150deg, #0F5180 0%, #1677AA 100%);
	   min-height: 100vh;
	   background-image: 
	     linear-gradient(150deg, #0F5180 0%, #1677AA 100%),
	     radial-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
	   background-size: 100% 100%, 22px 22px;
}