/* Shared accessibility safeguards for all public pages. */
/* 视觉上隐藏，但保留给搜索引擎和读屏软件 */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 10000;
    padding: 10px 16px;
    color: #ffffff;
    background: #1a202c;
    border-radius: 4px;
    text-decoration: none;
    transform: translateY(-160%);
    transition: transform 0.2s ease;
}

.skip-link:focus {
    transform: translateY(0);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.form-group input:focus-visible,
.form-group select:focus-visible,
.form-group textarea:focus-visible,
.contact-modal-form input:focus-visible,
.contact-modal-form textarea:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid #c9973f;
    outline-offset: 3px;
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        min-width: 44px;
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
}

/* 按项目要求，站点的展示型动画（首页 banner、合作伙伴与客户轮播、
   世界地图航线节点、AOS 滚入效果）不再随系统"减少动态效果"偏好关闭，
   这里只保留不影响观感的锚点跳转行为。 */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}