@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

body {
    font-family: 'Inter', sans-serif;
    color: #4E5969;
}

.hero-section {
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('./website_images/beijingtu.jpg');
    background-size: cover;
    background-position: center;
}

.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #165DFF;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.mobile-menu {
    transition: all 0.3s ease;
    max-height: 0;
    overflow: hidden;
}

.mobile-menu.active {
    max-height: 500px;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -5px rgba(22, 93, 255, 0.2);
}

.partner-logo {
    filter: grayscale(100%);
    opacity: 0.7;
    transition: all 0.3s ease;
}

.partner-logo:hover {
    filter: grayscale(0);
    opacity: 1;
}