footer {
    position: relative;
    background: rgba(255, 255, 255, 0.88);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    color: var(--text-strong);
    padding: .64rem 0 .32rem;
    border-top: 1px solid var(--border-soft);
    box-shadow: 0 -0.1rem 0.3rem rgba(11, 79, 138, 0.04);
    z-index: 10;
}

.footer-content {
    width: var(--global-width);
    max-width: var(--max-content-width);
    margin: 0 auto;
    /* 引入弹性盒模型替代网格布局，实现子元素的自适应居中对齐 */
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
}

/* 声明子容器的物理约束，防止极端情况下的弹性挤压变形 */
.footer-section {
    flex: 0 1 auto;
    min-width: 1.5rem;
}

.footer-section h3 {
    font-size: 0.176rem;
    margin-bottom: 0.15rem; /* 修正了可能存在的一百五十像素间距异常 */
    color: var(--primary-blue);
    background: linear-gradient(120deg, var(--text-strong) 0%, var(--primary-blue) 50%, var(--text-strong) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: background-position 0.4s ease;
}

.footer-section h3:hover {
    animation: textShimmer 3s linear infinite;
}

.footer-section p,
.footer-section li,
.footer-section a {
    color: var(--text-subtle);
    font-size: 0.152rem;
    line-height: 1.8;
}

.footer-section a {
    position: relative;
    display: inline-block;
    padding-bottom: 2px;
    transition: color var(--trans-base);
    text-decoration: none;
}

.footer-section a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--primary-blue);
    transition: width var(--trans-slow) cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 -1px 5px rgba(11, 79, 138, 0.3);
}

.footer-section a:hover,
.footer-section a:focus {
    color: var(--primary-blue);
    text-shadow: 0 0 10px rgba(11, 79, 138, 0.15);
}

.footer-section a:hover::after,
.footer-section a:focus::after {
    width: 100%;
}

.footer-bottom {
    width: var(--global-width);
    max-width: var(--max-content-width);
    margin: .5rem auto 0;
    border-top: 1px solid rgba(11, 79, 138, 0.1);
    padding-top: .75rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    font-size: 0.152rem;
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-bottom a:hover {
    color: var(--text-strong);
}

/* 剥离失效的网格媒体查询，针对极限压缩的移动端视口启用垂直流降级 */
@media (max-width: 760px) {
    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
}