/* TTC Accessibility Enhancements */

/* Focus Visible Outline - Keyboard Navigation */
:focus-visible {
    outline: 2px solid var(--ttc-primary);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--ttc-primary);
    outline-offset: 2px;
}

/* Skip to Content Link */
.ttc-skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--ttc-primary);
    color: white;
    padding: var(--ttc-space-sm) var(--ttc-space-md);
    text-decoration: none;
    z-index: 100;
    font-weight: var(--ttc-fw-semibold);
}

.ttc-skip-to-content:focus {
    top: 0;
}

/* Focus Ring Utility */
.ttc-focus-ring {
    position: relative;
}

.ttc-focus-ring:focus-within {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1), 0 0 0 2px var(--ttc-primary);
}

/* High Contrast Mode Support */
@media (prefers-contrast: more) {
    button {
        border-width: 2px;
    }
    
    input,
    select,
    textarea {
        border-width: 2px;
    }
    
    .ttc-text-muted {
        opacity: 0.8;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .ttc-spinner {
        animation: none;
        border: 3px solid var(--ttc-primary);
    }
    
    .ttc-pulse {
        animation: none;
    }
}

/* Dark Mode / Light Mode Indicator */
.ttc-color-mode-indicator {
    display: none;
}

@media (prefers-color-scheme: dark) {
    .ttc-color-mode-indicator {
        display: block;
        content: 'dark';
    }
}

@media (prefers-color-scheme: light) {
    .ttc-color-mode-indicator {
        display: block;
        content: 'light';
    }
}

/* Link Styling - Color + Underline */
a {
    text-decoration: underline;
    color: var(--ttc-primary);
}

a:visited {
    color: #7c3aed;
}

a:focus-visible {
    outline: 2px solid var(--ttc-primary);
    outline-offset: 2px;
}

/* Form Labels Required Indicator */
.ttc-form-label-required::after {
    content: ' *';
    color: #ef4444;
}

/* Error Messages - Visible & Semantic */
.ttc-error-message {
    color: #ef4444;
    font-size: var(--ttc-fs-xs);
    margin-top: var(--ttc-space-xs);
    display: flex;
    align-items: center;
    gap: var(--ttc-space-xs);
}

.ttc-error-message::before {
    content: '⚠';
    font-weight: var(--ttc-fw-bold);
}

/* Success Messages - Visible & Semantic */
.ttc-success-message {
    color: #10b981;
    font-size: var(--ttc-fs-xs);
    margin-top: var(--ttc-space-xs);
    display: flex;
    align-items: center;
    gap: var(--ttc-space-xs);
}

.ttc-success-message::before {
    content: '✓';
    font-weight: var(--ttc-fw-bold);
}

/* Warning Messages - Visible & Semantic */
.ttc-warning-message {
    color: #f59e0b;
    font-size: var(--ttc-fs-xs);
    margin-top: var(--ttc-space-xs);
    display: flex;
    align-items: center;
    gap: var(--ttc-space-xs);
}

.ttc-warning-message::before {
    content: '⚠';
    font-weight: var(--ttc-fw-bold);
}

/* Info Messages - Visible & Semantic */
.ttc-info-message {
    color: #6366f1;
    font-size: var(--ttc-fs-xs);
    margin-top: var(--ttc-space-xs);
    display: flex;
    align-items: center;
    gap: var(--ttc-space-xs);
}

.ttc-info-message::before {
    content: 'ℹ';
    font-weight: var(--ttc-fw-bold);
}

/* Icon Buttons - Text Label Visible */
.ttc-icon-button {
    position: relative;
}

.ttc-icon-button::after {
    content: attr(data-label);
    position: absolute;
    background: var(--ttc-bg-card);
    color: var(--ttc-text-main);
    padding: var(--ttc-space-xs) var(--ttc-space-sm);
    border-radius: var(--ttc-radius-sm);
    font-size: var(--ttc-fs-xs);
    white-space: nowrap;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: var(--ttc-space-sm);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--ttc-transition-fast);
    box-shadow: var(--ttc-shadow-md);
    z-index: 10;
}

.ttc-icon-button:hover::after,
.ttc-icon-button:focus::after {
    opacity: 1;
}

/* Disabled State - Clear Visual Indication */
:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

button:disabled {
    background: var(--ttc-border-subtle) !important;
    color: var(--ttc-text-muted) !important;
    cursor: not-allowed;
}

input:disabled,
select:disabled,
textarea:disabled {
    background: var(--ttc-bg-muted) !important;
    border-color: var(--ttc-border-subtle) !important;
    color: var(--ttc-text-muted) !important;
    cursor: not-allowed;
}

/* Form Field Grouping */
.ttc-form-group {
    margin-bottom: var(--ttc-space-lg);
}

.ttc-form-group legend {
    font-weight: var(--ttc-fw-semibold);
    margin-bottom: var(--ttc-space-md);
    color: var(--ttc-text-main);
}

/* Checkbox & Radio - Accessible */
.ttc-checkbox,
.ttc-radio {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--ttc-space-sm);
    cursor: pointer;
}

.ttc-checkbox input[type="checkbox"],
.ttc-radio input[type="radio"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--ttc-border-main);
    border-radius: var(--ttc-radius-sm);
    cursor: pointer;
    transition: all var(--ttc-transition-fast);
}

.ttc-radio input[type="radio"] {
    border-radius: 50%;
}

.ttc-checkbox input[type="checkbox"]:checked,
.ttc-radio input[type="radio"]:checked {
    background: var(--ttc-primary);
    border-color: var(--ttc-primary);
}

.ttc-checkbox input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    left: 4px;
    color: white;
    font-weight: var(--ttc-fw-bold);
}

.ttc-radio input[type="radio"]:checked::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
}

.ttc-checkbox input:focus-visible,
.ttc-radio input:focus-visible {
    outline: 2px solid var(--ttc-primary);
    outline-offset: 2px;
}

.ttc-checkbox label,
.ttc-radio label {
    cursor: pointer;
    margin: 0;
}

/* Tab Navigation - Keyboard Accessible */
.ttc-tabs {
    display: flex;
    border-bottom: 2px solid var(--ttc-border-light);
    gap: var(--ttc-space-sm);
}

.ttc-tab {
    padding: var(--ttc-space-md) var(--ttc-space-lg);
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: var(--ttc-fw-medium);
    color: var(--ttc-text-muted);
    transition: color var(--ttc-transition-fast);
    position: relative;
}

.ttc-tab:focus-visible {
    outline: 2px solid var(--ttc-primary);
    outline-offset: -2px;
}

.ttc-tab[aria-selected="true"] {
    color: var(--ttc-primary);
}

.ttc-tab[aria-selected="true"]::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--ttc-primary);
}

/* Skip Repeated Content */
.ttc-skip-nav {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--ttc-primary);
    color: white;
    padding: var(--ttc-space-sm) var(--ttc-space-md);
    text-decoration: none;
    z-index: 100;
}

.ttc-skip-nav:focus {
    top: 0;
}

/* Content Markers for Landmarks */
main {
    position: relative;
}

main::before {
    content: '';
    position: absolute;
    top: -1px;
    left: 0;
    right: 0;
    height: 1px;
    background: transparent;
}

/* Visually Hidden but Accessible */
.ttc-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;
}

/* Screen Reader Visible */
.ttc-sr-visible {
    display: block !important;
}