.hero-section {
    background: linear-gradient(rgba(0, 86, 179, 0.8), rgba(0, 86, 179, 0.8)), url('../images/0f88936b28c2ea8297e55dc2db9f0b852be433a9.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 120px 0;
}

.btn-primary {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
    font-weight: 600;
    padding: 12px 30px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--secondary-blue);
    border-color: var(--secondary-blue);
    transform: translateY(-2px);
}

.btn-outline-light {
    border-width: 2px;
    font-weight: 600;
    padding: 10px 28px;
}

.card {
    border: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    height: 100%;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.product-card {
    position: relative;
    overflow: hidden;
}
.product-card .product-image {
    position: relative;
    width: 100%;
    padding-top: 100%;            /* 4:3 比例，可按需求调整 */
    overflow: hidden;
    border-top-left-radius: inherit;
    border-top-right-radius: inherit;
}

.product-card .product-image-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.product-card img {
    transition: transform 0.3s ease;
}

.product-card:hover img {
    transform: scale(1.05);
}

.application-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
}

.application-item img {
    transition: transform 0.3s ease;
}

.application-item:hover img {
    transform: scale(1.1);
}

.application-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
    padding: 2rem 1rem 1rem;
}

.certification-logo {
    max-height: 60px;
    filter: grayscale(100%);
    transition: filter 0.3s ease;
}

.certification-logo:hover {
    filter: grayscale(0%);
}

.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.dropdown-menu {
    border: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}