* {
	margin: 0;
	padding: 0;
}

a {
	text-decoration: none;
}

#nav {
	position: fixed;
	z-index: 999;
	width: 100%;
	height: 60px;
	background: #782b11;
}

.logo {
	position: absolute;
	left: 5%;
}

ul {
	list-style: none;
}

#nav ul {
	width: 1220px;
	margin: 0 auto;
}

#nav li {
	margin-right: 170px;
	position: relative;
	float: left;
}

#nav li:nth-child(5) {
	margin-right: 0;
}

#nav li a {
	font-size: 30px;
	color: #b8947e;
	line-height: 60px;
	display: block;
}

#nav .index {
	border-bottom: #f00 solid 3px;
	position: relative;
	bottom: 3px;
}

#nav li .underline {
	position: absolute;
	bottom: 0;
	left: 50%;
	bottom: 5px;
	/* 初始点从中间开始 */
	width: 0;
	height: 3px;
	background-color: #F9FF3D;
	transition: all 0.3s ease;
}

#nav li:hover>a {
	font-weight: bold;
}

#nav li:hover .underline {
	width: 100%;
	left: 0;
}

#nav .er_nav {
	position: absolute;
	top: 60px;
	left: -10px;
	width: 140px;
	background: #fffcfc;
	display: none;
	box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
	border-radius: 0 0 10px 10px;
	z-index: 999;
}

#nav .er_nav li {
	width: 140px;
	height: 50px;
	float: none;
	border-bottom: #c00 solid 3px;
}

#nav .er_nav li:nth-last-child(1) {
	border-bottom: none;
}

#nav .er_nav li a {
	width: 140px;
	font-size: 26px;
	line-height: 50px;
	text-align: center;
}

#nav li:hover .er_nav {
	display: block;
}

#nav .er_nav img {
	display:inline-block;
	width: 20px;
	height: 20px;
}