/*
 *  a11y.css — 无障碍辅助样式
 *  .sr-only / .skip-link
 */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.skip-link {
    position: fixed;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--space-2) var(--space-4);
    z-index: var(--z-modal);
    transition: top var(--dur) var(--ease);
    text-decoration: none;
    display: block;
    height: auto;
    line-height: 1.5;
}
.skip-link:focus {
    top: 0;
}