* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

body {
    background-color: #f0f4f8;
    color: #2d3748;
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2a4365;
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: #4a5568;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: #2b6cb0;
}

.section {
    padding: 8rem 2rem 4rem;
    min-height: 80vh;
}

.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1a202c;
}

.hero p {
    font-size: 1.2rem;
    color: #4a5568;
    max-width: 600px;
    margin-bottom: 1.5rem;
}

.btn-container {
    position: absolute;
    margin-top: 200px;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: #2a4365;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn:hover {
    background-color: #1e365d;
    transform: translateY(-2px);
    box-shadow: 0px 0px 10px rgb(0, 13, 255);
}

.btn-group {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.btn-light {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: #e2e8f0;
    color: #2d3748;
    text-decoration: none;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-light:hover {
    background-color: #cbd5e0;
    transform: translateY(-2px);
}

/* 控制下载按钮下拉框 */
.btn-group-dropdown {
    position: relative;
}

.btn-group-dropdown .dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 180px;
    border-radius: 4px;
    transform: translateY(46px);
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.btn-group-dropdown .dropdown-content a {
    color: green;
    padding: 12px 16px;
    text-decoration: none;
    text-shadow: 0 0 10px yellow;
    display: block;
}

.btn-group-dropdown .dropdown-content a:hover {
    background-color: #abfff8;
}

.btn-group-dropdown:hover .dropdown-content {
    display: block;
}

#products {
    background: rgba(255, 255, 255, 0);
}

#products h2 {
    display: block;
    margin-top: 60px;
}

#products .notmargin {
    margin-top: 0;
}

.product-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin: 1rem 0;
    transition: transform 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.text-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: -1 !important;
}

.product-card:hover {
    transform: translateY(-5px);
    background-color: #fffcdf;
}

.product-card .appicon {
    display: block;
    float: left;
    height: 40px;
    margin: 5px;
    margin-right: 20px;
}

#loading-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background-color: white;
    z-index: 2000;
    transition: width 0.5s ease, transform 0.5s ease, opacity 0.5s ease;
}

#about p {
    font-size: 18px;
}

.footer {
    padding: 1rem;
    text-align: center;
    background: #2a4365;
    color: #ffffff;
    position: fixed;
    bottom: 0;
    width: 100%;
}

@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .product-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1.5rem;
    }
    
    .btn-group {
        justify-content: flex-start;
    }
    
    .section {
        padding: 6rem 1rem 3rem;
    }
}