.hover-card {
    border: 1px solid rgba(0, 0, 0, 0.06); /* 添加淡边框 */
    border-radius: 8px;
    background-color: #fff;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.hover-card:hover {
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.contact-fab {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background-color: #1677ff;
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 10px 24px rgba(22, 119, 255, 0.35);
    z-index: 1030;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.contact-fab i {
    font-size: 24px;
    line-height: 1;
}

.contact-fab:hover {
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(22, 119, 255, 0.45);
}

.contact-fab:focus-visible {
    outline: 3px solid rgba(22, 119, 255, 0.35);
    outline-offset: 3px;
}

@media (max-width: 576px) {
    .contact-fab {
        right: 16px;
        bottom: 16px;
    }
}