/* 底部悬停按钮 */
.footer_bottom_nav {
    line-height : 1;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: white;
    box-shadow: 0 -0.125rem clamp(0.5rem, 1.5vw, 0.625rem) rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: clamp(0.5rem, 1.5vw, 0.625rem) 0; /* 使用clamp */
}

.footer_nav_buttons {
    display: flex;
    justify-content: space-around;
    width: 100%;
    margin: 0 auto;
}

.footer_nav_button {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: #666;
    transition: var(--transition);
    border-radius: var(--border-radius);
    flex: 1;
    text-align: center;
    justify-content: center;
    min-width: 0;
    font-weight: bold;
    border-left: 0.0625rem solid var(--border-color);
    border-right: 0.0625rem solid var(--border-color);
}

.footer_nav_button:hover, .footer_nav_button.active {
    color: var(--primary-color);
    font-weight: bold;
}

.footer_nav_text {
    font-size: clamp(2rem, 2.5vw, 2.5rem);
}