body {
    font-family: 'Roboto', sans-serif;
    color: #333;
}

header {
    background-color: #343a40;
    color: white;
}

.hero {
    background-color: #24447F;
    color: white;
    text-align: center;
    padding: 4rem 0;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

.btn-lg {
    margin: 0 1rem;
}

.features, .about, .contact {
    padding: 4rem 0;
}

.features h2, .about h2, .contact h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

.feature-item {
    margin-bottom: 2rem;
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.about p, .contact p {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.25rem;
}

.contact a {
    color: #24447F;
    text-decoration: none;
}

footer {
    background-color: #343a40;
    color: white;
    text-align: center;
    padding: 1rem 0;
    font-size: 0.8rem;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown:hover .dropdown-menu {
    display: block;
}
.dropdown-menu {
    display: none;
    position: absolute;
    background-color: #343a40;
    min-width: 150px;
    z-index: 1000;
    top: 100%; /* 将下拉菜单放置在触发按钮的下方 */
    left: auto;
    right: 0;
}

.dropdown-menu a {
    color: #ffffff;
    padding: 10px;
    display: block;
    text-decoration: none;
}

.dropdown-menu a:hover {
    background-color: #6c757d;
}
.download-btn {
    background-image: url('../imgs/download.webp')!important;
    background-size: cover; /* 使背景图片覆盖整个按钮 */
    background-position: center; /* 使背景图片居中 */
    width: 108px; /* 设置按钮宽度 */
    height: 40px; /* 设置按钮高度 */
    display: inline-block;
    border: none; /* 移除按钮边框 */
    text-decoration: none; /* 移除默认的下划线 */
    border-radius: 7px / 7px;
}