* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: "Microsoft Yahei", sans-serif;
    color: #222;
    background: #f8fafc;
}
img {
    display: block;
    width: 100%;
}
ul {
    list-style: none;
}
a {
    text-decoration: none;
}
.container {
    width: 1320px;
    margin: 0 auto;
    padding: 80px 0;
}
@media (max-width:1320px) {
    .container {
        width: 94%;
    }
}
.section-title {
    text-align: center;
    font-size: 36px;
    color: #0a2463;
    margin-bottom: 60px;
    position: relative;
}
.section-title::after {
    content: "";
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg,#0a2463,#3e92cc);
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: -15px;
}
header {
    background: linear-gradient(90deg,#051638,#0a2463);
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.nav-wrap {
    width: 1320px;
    margin: 0 auto;
    height: 105px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    color: #fff;
    font-size: 28px;
    font-weight: bold;
}
.nav-list {
    display: flex;
}
.nav-list li a {
    color: #fff;
    padding: 0 26px;
    height: 105px;
    display: flex;
    align-items: center;
    font-size: 17px;
    transition: 0.3s;
    position: relative;
}
.nav-list li a.active,
.nav-list li a:hover {
    color: #62b0f0;
}
.nav-list li a.active::after {
    content: "";
    width: 60%;
    height: 4px;
    background: #3e92cc;
    position: absolute;
    bottom: 0;
    left: 20%;
}
.page-banner {
    width: 100%;
    height: 340px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: #fff;
    font-weight: bold;
    letter-spacing: 3px;
    background: linear-gradient(rgba(0,15,40,0.55),rgba(0,15,40,0.55)),url("") center/cover;
}
footer {
    background: linear-gradient(90deg,#051638,#0a2463);
    color: #fff;
    text-align: center;
    padding: 50px 0;
    margin-top: 40px;
}
@media(max-width:768px) {
    .nav-wrap {
        flex-direction: column;
        height: auto;
        padding: 20px 0;
    }
    .nav-list {
        flex-wrap: wrap;
        justify-content: center;
        margin-top: 15px;
    }
    .nav-list li a {
        height: 50px;
        padding: 0 12px;
        font-size: 15px;
    }
    .page-banner {
        height: 260px;
        font-size: 28px;
    }
}