/* 头部 */
* {
    margin: 0px;
    padding: 0px;
}

.header {
    display: flex;
    align-items: center;
    height: 78px;
    background-color: rgb(64, 136, 231);
    padding: 0 10px;
    height: 107px;
    position: fixed;
    top: 0;
    width: 1500px;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.content {
    margin-top: 78px;
}

.logo img {
    width: 100%;
    max-width: 198px;
    height: auto;
    margin-right: 30px;
}

.nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

.nav ul li {
    margin: 0 15px;
    position: relative; /* 相对于此元素定位下拉列表 */
}

/* 统一导航项大小 */
.nav ul li a {
    display: flex;
    align-items: center; /* 垂直居中 */
    justify-content: center; /* 水平居中 */
    height: 42px;
    width: 120px; /* 统一宽度 */
    padding: 0 20px;
    font-size: 18px;
    color: #fff;
    text-decoration: none;
    text-align: center;
}

.nav ul li a:hover {
    background-color: rgba(7, 60, 85, 0.2);
}

.search {
    display: flex;
    align-items: center;
    margin-left: 50px;
    background-color: skyblue;
    padding: 0 15px;
    border-radius: 5px;
}

.search input {
    flex: 1;
    height: 30px;
    border: 1px solid rgb(61, 166, 232);
    border-right: 0;
    color: rgb(90, 95, 95);
    font-size: 14px;
    padding-left: 10px;
}

.search button {
    height: 33px;
    padding: 0 15px;
    background-color: rgb(64, 136, 231);
    color: white;
    border: none;
    border-radius: 0 5px 5px 0;
}

/* 导航下拉 */
.dropdown {
    display: none;
    position: absolute;
    background-color: rgb(64, 136, 231);
    box-shadow: 0px 8px 16px 0px rgba(6, 122, 231, 0.2);
    z-index: 1;
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 18px;
    text-align: center;
    overflow: hidden;
    left: 0;
    top: 100%;
    opacity: 0.9;
    width: 100%; /* 下拉菜单宽度与上方标签保持一致 */
}

.nav ul li:hover .dropdown {
    display: block; /* 显示下拉菜单 */
}

.dropdown ul {
    display: block; /* 垂直排列 */
    padding: 0;
    margin: 0;
}

.dropdown ul li {
    margin: 0;
}

/* 统一下拉菜单项大小 */
.dropdown ul li a {
    display: flex;
    align-items: center; /* 垂直居中 */
    justify-content: center; /* 水平居中 */
    height: 42px;
    width: 120px; /* 统一宽度 */
    padding: 0 20px;
    font-size: 15px;
    color: #fff;
    text-decoration: none;
    text-align: center;
    white-space: nowrap; /* 防止文字换行 */
}

.dropdown ul li a:hover {
    background-color: #063d6a;
}

body {
    padding-top: 107px;
}

.main-banner img {
    width: 1500px;
    height: 300px;
    display: block;
}

.main-content {
    background-color: rgb(255, 255, 255);
    width: 1500px;
}

.footer {
    background-color: #827d7d;
    text-align: center;
    padding: 10px 0;
}