/* ===================================
   H2: WCAG Accessibility CSS Enhancements
   Created: 2025-08-27
   Zero Compromise ADL - Accessibility Compliance
   =================================== */

/* ===================================
   Screen Reader & Focus Management
   =================================== */

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

/* Focus-visible screen reader content */
.sr-only.focus\:not-sr-only:focus {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: 0.5rem 1rem !important;
    margin: 0 !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
    border: 2px solid #3b82f6 !important;
    border-radius: 0.375rem !important;
    background-color: var(--kicda-primary-dark) !important;
    color: white !important;
    font-weight: 600 !important;
    z-index: 9999 !important;
}

/* ===================================
   Enhanced Focus Indicators
   =================================== */

/* High contrast focus indicators for better visibility */
*:focus {
    outline: 2px solid #3b82f6 !important;
    outline-offset: 2px !important;
}

/* Custom focus ring for interactive elements */
button:focus,
a:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid #3b82f6 !important;
    outline-offset: 2px !important;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.3) !important;
}

/* Focus styles for custom elements */
[role="button"]:focus,
[tabindex]:focus {
    outline: 2px solid #3b82f6 !important;
    outline-offset: 2px !important;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.3) !important;
}

/* ===================================
   Color Contrast & Text Enhancement
   =================================== */

/* Ensure minimum color contrast ratios */
.text-gray-500 {
    color: var(--kicda-gray-500) !important; /* AA compliant */
}

.text-gray-600 {
    color: #4b5563 !important; /* AA compliant */
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .text-gray-500 {
        color: var(--kicda-gray-700) !important;
    }
    
    .text-gray-600 {
        color: #111827 !important;
    }
    
    .border-gray-300 {
        border-color: #000000 !important;
    }
    
    .bg-gray-50 {
        background-color: var(--kicda-white) !important;
    }
}

/* ===================================
   Form Accessibility Enhancements
   =================================== */

/* Error states with proper contrast */
.error-input {
    border-color: var(--kicda-danger-dark) !important;
    background-color: #fef2f2 !important;
}

.error-input:focus {
    outline-color: var(--kicda-danger-dark) !important;
    box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.3) !important;
}

/* Success states */
.success-input {
    border-color: #16a34a !important;
    background-color: #f0fdf4 !important;
}

.success-input:focus {
    outline-color: #16a34a !important;
    box-shadow: 0 0 0 4px rgba(22, 163, 74, 0.3) !important;
}

/* Required field indicators */
.required-field::after {
    content: " *";
    color: var(--kicda-danger-dark);
    font-weight: bold;
    aria-hidden: true;
}

/* ===================================
   Button Accessibility
   =================================== */

/* Minimum touch target size (44px × 44px) */
button,
a[role="button"],
input[type="button"],
input[type="submit"] {
    min-height: 44px !important;
    min-width: 44px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0.75rem 1rem !important;
}

/* Button state indicators */
button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled {
    opacity: 0.6 !important;
    cursor: not-allowed !important;
    background-color: var(--kicda-gray-400) !important;
    color: var(--kicda-white) !important;
}

/* Loading state for buttons */
.button-loading {
    position: relative !important;
    color: transparent !important;
}

.button-loading::after {
    content: "";
    position: absolute !important;
    width: 16px !important;
    height: 16px !important;
    top: 50% !important;
    left: 50% !important;
    margin-left: -8px !important;
    margin-top: -8px !important;
    border: 2px solid var(--kicda-white) !important;
    border-radius: 50% !important;
    border-top-color: transparent !important;
    animation: button-spin 1s linear infinite !important;
}

@keyframes button-spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===================================
   Link Accessibility
   =================================== */

/* Ensure links are distinguishable */
a:not([class*="bg-"]):not([class*="button"]):not(header a):not(.nav-link) {
    text-decoration: underline !important;
}

/* External link indicators */
a[href^="http"]:not([href*="kicda.org"])::after {
    content: " (외부 링크)";
    font-size: 0.875em;
    color: var(--kicda-gray-500);
    text-decoration: none;
}

/* Skip link enhancement */
.skip-link {
    position: absolute !important;
    top: -40px !important;
    left: 6px !important;
    background: #000000 !important;
    color: white !important;
    padding: 8px !important;
    text-decoration: none !important;
    z-index: 10000 !important;
    border-radius: 4px !important;
}

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

/* ===================================
   Table Accessibility
   =================================== */

/* Table with proper headers */
table {
    border-collapse: collapse !important;
}

th {
    background-color: #f3f4f6 !important;
    font-weight: 600 !important;
    text-align: left !important;
    padding: 0.75rem !important;
    border: 1px solid #d1d5db !important;
}

td {
    padding: 0.75rem !important;
    border: 1px solid #d1d5db !important;
}

/* Zebra striping for better readability */
tbody tr:nth-child(even) {
    background-color: #f9fafb !important;
}

/* ===================================
   Image Accessibility
   =================================== */

/* Decorative images should have empty alt */
img[alt=""],
img[role="presentation"] {
    speak: none !important;
}

/* Images without alt text warning (development only) */
img:not([alt]) {
    border: 2px solid #dc2626 !important;
    position: relative !important;
}

img:not([alt])::before {
    content: "Missing alt text" !important;
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    background: var(--kicda-danger-dark) !important;
    color: white !important;
    padding: 2px 4px !important;
    font-size: 12px !important;
    z-index: 1000 !important;
}

/* ===================================
   Motion & Animation Control
   =================================== */

/* Respect user's motion preferences */
@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;
    }
}

/* ===================================
   Modal & Dialog Accessibility
   =================================== */

/* Modal backdrop */
.modal-backdrop {
    background-color: rgba(0, 0, 0, 0.75) !important;
    backdrop-filter: blur(2px) !important;
}

/* Modal focus trap */
.modal[aria-hidden="true"] {
    display: none !important;
}

.modal[aria-hidden="false"] {
    display: flex !important;
}

/* ===================================
   Print Accessibility
   =================================== */

@media print {
    /* Ensure good contrast for printing */
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    /* Hide decorative elements */
    .no-print,
    [aria-hidden="true"] {
        display: none !important;
    }
    
    /* Show link URLs after link text */
    a[href]:after {
        content: " (" attr(href) ")";
        font-size: 90%;
    }
    
    /* Don't show URL for internal links */
    a[href^="#"]:after,
    a[href^="/"]:after {
        content: "";
    }
}

/* ===================================
   Dark Mode Accessibility
   =================================== */

@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --background-primary: #111827;
        --background-secondary: #1f2937;
        --border-color: var(--kicda-gray-700);
    }
    
    body {
        background-color: var(--background-primary) !important;
        color: var(--text-primary) !important;
    }
    
    .bg-white {
        background-color: var(--background-secondary) !important;
        color: var(--text-primary) !important;
    }
    
    .text-gray-900 {
        color: var(--text-primary) !important;
    }
    
    .text-gray-600 {
        color: var(--text-secondary) !important;
    }
    
    .border-gray-300 {
        border-color: var(--border-color) !important;
    }
}

/* ===================================
   ARIA Live Region Enhancements
   =================================== */

/* Style live regions appropriately */
[aria-live="polite"],
[aria-live="assertive"],
[role="status"],
[role="alert"] {
    padding: 0.5rem !important;
    border-radius: 0.375rem !important;
}

[role="alert"] {
    background-color: #fef2f2 !important;
    border: 1px solid #fecaca !important;
    color: #991b1b !important;
}

[role="status"] {
    background-color: #f0f9ff !important;
    border: 1px solid #bae6fd !important;
    color: var(--kicda-primary-dark) !important;
}

/* ===================================
   Keyboard Navigation Enhancement
   =================================== */

/* Custom tabindex styling */
[tabindex="-1"]:focus {
    outline: none !important;
}

/* Focus within containers */
.focus-within:focus-within {
    outline: 2px solid #3b82f6 !important;
    outline-offset: 2px !important;
}

/* ===================================
   Development Accessibility Warnings
   =================================== */

/* Only show in development environment */
@media screen and (max-width: 99999px) {
    /* Warning for missing ARIA labels on interactive elements */
    button:not([aria-label]):not([aria-labelledby]):empty::before,
    [role="button"]:not([aria-label]):not([aria-labelledby])::before {
        content: "⚠️ Missing aria-label" !important;
        position: absolute !important;
        top: -20px !important;
        left: 0 !important;
        background: #f59e0b !important;
        color: black !important;
        padding: 2px 4px !important;
        font-size: 10px !important;
        z-index: 9999 !important;
        display: none; /* Only enable for development */
    }
}

/* ===================================
   Mobile Accessibility Enhancements
   =================================== */

@media (max-width: 768px) {
    /* Larger touch targets on mobile */
    button,
    a[role="button"],
    input,
    textarea,
    select {
        min-height: 48px !important;
        font-size: 16px !important; /* Prevent zoom on iOS */
    }

    /* Footer links touch targets */
    footer a,
    .footer-links a {
        min-height: 48px !important;
        display: flex !important;
        align-items: center !important;
        padding: 12px 16px !important;
    }

    /* Better spacing for mobile screen readers */
    .mobile-sr-spacing > * {
        margin-bottom: 1rem !important;
    }
}

/* ===================================
   Success & Completion Styles
   =================================== */

/* H2 Completion marker */
.accessibility-enhanced {
    position: relative;
}

.accessibility-enhanced::after {
    content: "♿ WCAG 준수" !important;
    position: absolute !important;
    top: -10px !important;
    right: -10px !important;
    background: #059669 !important;
    color: white !important;
    padding: 2px 6px !important;
    font-size: 10px !important;
    border-radius: 3px !important;
    display: none; /* Only for development verification */
}