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

/* Skip links */
.skip-links {
    position: absolute;
    top: -40px;
    left: 6px;
    z-index: 1000;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--accent-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1001;
}

.skip-link:focus {
    top: 6px;
}

/* AST Viewer Styles */
.ast-viewer-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--bg-primary);
    border-left: 1px solid var(--border-color);
    z-index: 1000;
    transition: right 0.3s ease;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.ast-viewer-panel.visible {
    right: 0;
}

.ast-viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.ast-viewer-controls {
    display: flex;
    gap: 0.5rem;
}

.btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 4px;
    cursor: pointer;
}

.ast-search-container {
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.ast-search-container input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.ast-viewer-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.ast-viewer-footer {
    padding: 0.5rem 1rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
    font-size: 0.8rem;
}

.ast-stats {
    display: flex;
    gap: 1rem;
}

.ast-node {
    margin: 0.25rem 0;
}

.ast-node-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem;
    border-radius: 4px;
    cursor: pointer;
}

.ast-node-header:hover {
    background: var(--bg-secondary);
}

.ast-expand-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 16px;
    text-align: center;
}

.ast-node-type {
    font-weight: bold;
    color: var(--accent-color);
}

.ast-node-props {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.ast-node-value {
    color: var(--text-primary);
    font-style: italic;
}

.ast-node-position {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-left: auto;
}

.ast-search-match {
    background: var(--warning-color);
    color: var(--bg-primary);
}

.ast-error {
    padding: 1rem;
    background: var(--danger-color);
    color: white;
    border-radius: 4px;
    margin: 1rem 0;
}

/* Mobile responsive adjustments */
@media (max-width: 768px) {
    .ast-viewer-panel {
        width: 100%;
        right: -100%;
    }
}