* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", sans-serif;
}
html {
    scroll-behavior: smooth;
}
/* 全局藏青色背景 */
body {
    background-color: #1a365d;
    color: #ffffff;
}
/* 导航栏 */
nav {
    width: 100%;
    background: #7c0000;
    padding: 16px 40px;
    position: fixed;
    top: 0;
    z-index: 999;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    color: #fff;
    font-size: 26px;
    font-weight: bold;
}
.nav-list a {
    color: white;
    text-decoration: none;
    margin: 0 12px;
    font-size: 16px;
    transition: 0.3s;
}
.nav-list a:hover {
    color: #ffd700;
}
/* 首页横幅区域 */
.home-banner {
    width: 100%;
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.5),rgba(0,0,0,0.5)), url("images/1.jpg");
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #fff;
    text-align: center;
    padding-top: 70px;
}
/* 顶部大标题：楷体 + 字间距 */
.home-banner h1 {
    font-family: "KaiTi", "楷体", serif;
    font-size: 50px;
    margin-bottom: 20px;
    letter-spacing: 8px;
}
.home-banner p {
    font-size: 20px;
    max-width: 850px;
    line-height: 1.8;
}
/* 五大板块卡片区域 */
.box-wrap {
    max-width: 1200px;
    margin: 80px auto;
    padding: 0 20px;
}
.title {
    text-align: center;
    font-size: 36px;
    color: #ffd700;
    margin-bottom: 50px;
}
.card-group {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    justify-content: center;
}
.card {
    width: 260px;
    background: #2d4a77;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    transition: all 0.3s;
}
.card:hover {
    transform: translateY(-10px);
}
.card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
}
.card-text {
    padding: 18px;
    color: white;
}
.card-text h3 {
    color: #ffd700;
    margin-bottom: 8px;
}
.card-text a {
    display: inline-block;
    margin-top: 10px;
    background: #7c0000;
    color: white;
    padding: 6px 14px;
    text-decoration: none;
    border-radius: 4px;
}
/* 子页面通用样式 */
.sub-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 120px 30px 60px;
}
.sub-page h1 {
    color: #ffd700;
    text-align: center;
    font-size: 36px;
    margin-bottom: 30px;
}
.sub-page img {
    width: 100%;
    max-height: 480px;
    border-radius: 10px;
    margin-bottom: 25px;
    box-shadow: 0 0 15px rgba(0,0,0,0.2);
    object-fit: cover;
}
.sub-page p {
    font-size: 18px;
    line-height: 1.9;
    color: #fff;
    margin-bottom: 16px;
    text-indent: 2em;
}
.back-btn {
    display: inline-block;
    background: #7c0000;
    color: white;
    padding: 10px 24px;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 20px;
    transition: 0.3s;
}
.back-btn:hover {
    background: #5a0000;
}
/* 手机端适配 */
@media (max-width:768px) {
    nav {
        flex-direction: column;
    }
    .nav-list {
        margin-top: 12px;
    }
    .home-banner h1 {
        font-size: 32px;
    }
}

/* 底部多图并排样式 */
.img-group {
    display: flex;
    gap: 20px;
    margin: 20px 0;
}
.img-group img {
    flex: 1;
    width: 50%;
    max-height: 300px;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 0 15px rgba(0,0,0,0.2);
}

/* 视频模块样式 */
.video-box {
    margin: 30px 0;
}
.video-box video {
    width: 70%;          /* 数值越大视频越大，70%是适中尺寸 */
    max-width: 800px;    /* 同步调大最大宽度限制 */
    margin: 0 auto;
    display: block;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.3);
}