/**
 * Accessibility Styles
 * WCAG 2.1 Level AA compliant styles
 */

/* Skip Links */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    font-weight: 600;
    border-radius: 0 0 4px 0;
    z-index: 10000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
    outline: 3px solid #fff;
    outline-offset: 2px;
}

/* Focus Indicators (WCAG 2.4.7) */
*:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

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

/* Enhanced focus for interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(0, 128, 83, 0.2);
}

/* Skip focus for mouse users on buttons */
button:focus:not(:focus-visible) {
    outline: none;
    box-shadow: none;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .btn-primary,
    .btn-secondary,
    .btn-danger {
        border: 2px solid currentColor;
    }
    
    *:focus-visible {
        outline-width: 3px;
        outline-offset: 3px;
    }
}

/* Reduced Motion (WCAG 2.3.3) */
@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;
    }
}

/* 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-width: 0;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* Live Region Announcements */
[aria-live="polite"],
[aria-live="assertive"] {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

.live-region-visible[aria-live] {
    position: static;
    width: auto;
    height: auto;
}

/* Keyboard Navigation Indicators */
.keyboard-user *:focus {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

/* Error Message Accessibility */
.error-message,
.success-message {
    role: alert;
}

.error-message:not(:empty),
.success-message:not(:empty) {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-md);
}

.error-message {
    background-color: #fee;
    border-left: 4px solid #c00;
    color: #900;
}

.success-message {
    background-color: #efe;
    border-left: 4px solid #0a0;
    color: #060;
}

/* Form Field Error States */
.form-input[aria-invalid="true"] {
    border-color: #c00;
    background-color: #fef0f0;
}

.form-input[aria-invalid="true"]:focus {
    outline-color: #c00;
    box-shadow: 0 0 0 4px rgba(204, 0, 0, 0.2);
}

/* Required Field Indicator */
.required-indicator {
    color: #c00;
    font-weight: bold;
    margin-left: 2px;
}

/* Disabled State (WCAG 1.4.1) */
button:disabled,
input:disabled,
select:disabled,
textarea:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Loading State Accessibility */
.btn-loading {
    position: relative;
    color: transparent !important;
}

.btn-loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spinner 0.6s linear infinite;
}

@keyframes spinner {
    to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
    .btn-loading::after {
        animation: none;
        border-color: white;
        border-top-color: transparent;
    }
}

/* Touch Target Size (WCAG 2.5.5) */
button,
a,
input[type="checkbox"],
input[type="radio"],
select {
    min-height: 44px;
    min-width: 44px;
}

/* Exception for inline links in text */
p a,
li a,
.inline-link {
    min-height: auto;
    min-width: auto;
}

/* Checkbox and Radio Accessibility */
input[type="checkbox"],
input[type="radio"] {
    width: 20px;
    height: 20px;
    margin-right: 8px;
    cursor: pointer;
}

input[type="checkbox"]:focus,
input[type="radio"]:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Password Toggle Accessibility */
.password-toggle {
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.password-toggle:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    min-height: 44px;
    min-width: 44px;
    padding: 8px;
}

.mobile-menu-toggle:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Dark Mode / Theme Toggle Support */
@media (prefers-color-scheme: dark) {
    .skip-link {
        background: #1a1a1a;
        color: #00b368;
    }
    
    *:focus-visible {
        outline-color: #00b368;
        box-shadow: 0 0 0 4px rgba(0, 179, 104, 0.2);
    }
}

/* Language Support (RTL) */
[dir="rtl"] .skip-link {
    left: auto;
    right: 0;
    border-radius: 0 0 0 4px;
}

/* Print Accessibility */
@media print {
    .skip-link,
    .mobile-menu-toggle,
    .password-toggle {
        display: none;
    }
    
    *:focus {
        outline: none !important;
    }
}

/* Color Contrast Helpers */
.text-contrast-high {
    color: #000;
    background: #fff;
}

.text-contrast-reverse {
    color: #fff;
    background: #000;
}

/* Focus Trap for Modals */
.modal-open {
    overflow: hidden;
}

.modal[aria-modal="true"] {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
}

/* Tooltip Accessibility */
[role="tooltip"] {
    position: absolute;
    z-index: 1000;
    background: #333;
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 14px;
    pointer-events: none;
}

/* Status Messages */
[role="status"] {
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
}

/* Alert Messages */
[role="alert"] {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 500;
}