/* ==========================================================================
   无障碍基础：跳过导航链接
   —— 平时隐藏在视口之外，只有键盘 Tab 聚焦时才出现。
   ========================================================================== */
.skip-link {
    position: absolute;
    top: -70px;
    left: 12px;
    z-index: 2000;
    padding: 10px 18px;
    border-radius: 0 0 12px 12px;
    background: var(--brand-900, #3a2a1e);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-decoration: none;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.28);
    transition: top 0.18s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
    top: 0;
    color: #fff;
    text-decoration: none;
    outline: 3px solid var(--gold-400, #f0c95c);
    outline-offset: 2px;
}

/* <main> 只是跳转锚点的落点，程序化聚焦时不需要再画一圈轮廓 */
#main-content:focus {
    outline: none;
}