/* Accessibility Styles - WCAG 2.1 AA Compliant */

/* Visually hidden class for screen readers */
.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;
}

/* Focus visible enhancements for WCAG 2.4.7 (Focus Visible) */
*:focus-visible {
    outline: 3px solid var(--primary-blue, #0057B8);
    outline-offset: 2px;
}

/* High contrast focus for dark backgrounds */
[data-theme="dark"] *:focus-visible {
    outline-color: #4A9EFF;
}

/* Skip to content link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-blue, #667eea);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    font-weight: 600;
    z-index: 10000;
    border-radius: 0 0 4px 0;
    transition: top 0.3s ease;
}

.skip-to-content:focus {
    top: 0;
    outline: 3px solid #ffd700;
    outline-offset: 2px;
}

/* Table keyboard navigation focus styles */
table tbody tr:focus-visible {
    outline: 3px solid var(--primary-blue, #667eea);
    outline-offset: -3px;
    background-color: rgba(102, 126, 234, 0.1);
    box-shadow: inset 0 0 0 2px rgba(102, 126, 234, 0.3);
}

table tbody tr[tabindex="0"] {
    cursor: pointer;
}

table td:focus-visible,
table th:focus-visible {
    outline: 2px solid var(--primary-blue, #667eea);
    outline-offset: -2px;
    background-color: rgba(102, 126, 234, 0.15);
}

/* Focus visible styles for interactive elements */
button:focus-visible,
a:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 3px solid var(--primary-blue, #667eea);
    outline-offset: 2px;
}

/* Remove default focus outline and use focus-visible */
button:focus:not(:focus-visible),
a:focus:not(:focus-visible),
select:focus:not(:focus-visible),
input:focus:not(:focus-visible),
table tbody tr:focus:not(:focus-visible) {
    outline: none;
}