/* ===================================================
   WCAG 2.1 AA ACCESSIBILITY ENHANCEMENTS
   ===================================================
   
   Mejoras de accesibilidad que cumplen con:
   - WCAG 2.1 Level AA
   - Section 508
   - ARIA Best Practices
   
   ================================================= */

/* ==================== 
   1. FOCUS MANAGEMENT 
   ==================== */

/* Enhanced Focus Indicators - WCAG 2.4.7 */
*:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 3px;
    border-radius: 4px;
    transition: outline-offset 0.15s ease;
}

/* Remove focus for mouse users (only keyboard) */
*:focus:not(:focus-visible) {
    outline: none;
}

/* High Contrast 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(--primary);
    outline-offset: 3px;
    box-shadow: 0 0 0 5px rgba(0, 212, 255, 0.2);
}

/* Focus Within for Containers */
.card:focus-within,
.post-card:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.3);
}

/* ==================== 
   2. KEYBOARD NAVIGATION 
   ==================== */

/* Visible Tab Index Elements */
[tabindex="0"]:not(a):not(button):not(input):not(textarea):not(select) {
    cursor: pointer;
}

/* Enhanced Button Keyboard States */
button:focus-visible,
.btn:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 3px;
    transform: scale(1.02);
}

/* Link Skip Navigation */
.skip-link {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: var(--bg-dark);
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    z-index: 10001;
    transition: top 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.5);
}

.skip-link:focus {
    top: 20px;
    outline: 3px solid var(--accent);
    outline-offset: 5px;
}

/* ==================== 
   3. COLOR CONTRAST - WCAG 2.1.4.3
   ==================== */

/* Ensure Minimum Contrast Ratio 4.5:1 for Normal Text */
/* 3:1 for Large Text (18pt+ or 14pt+ bold) */

/* Text Contrast Adjustments */
.text-muted {
    color: #999999; /* Improved from #666666 for better contrast */
}

[data-theme="light"] .text-muted {
    color: #666666; /* Adequate contrast on light background */
}

/* Link Contrast Enhancement */
a {
    color: var(--primary);
    text-decoration-skip-ink: auto;
}

a:hover,
a:focus {
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

/* Button Contrast */
.btn-primary {
    background: var(--primary);
    color: #000000; /* Black text on cyan for 7:1 contrast */
    font-weight: 600;
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--primary-dark);
    color: #000000;
}

/* Badge/Tag Contrast */
.tag,
.badge,
.post-category {
    background: rgba(0, 212, 255, 0.2);
    color: #00ffff; /* Bright cyan for visibility */
    border: 1px solid rgba(0, 212, 255, 0.5);
    font-weight: 600;
}

[data-theme="light"] .tag,
[data-theme="light"] .badge,
[data-theme="light"] .post-category {
    background: rgba(0, 153, 204, 0.15);
    color: #006080; /* Dark cyan for light theme */
    border-color: rgba(0, 153, 204, 0.3);
}

/* ==================== 
   4. FORM ACCESSIBILITY 
   ==================== */

/* Label Association - WCAG 1.3.1, 3.3.2 */
label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
}

/* Required Field Indicator */
label.required::after,
label[required]::after {
    content: " *";
    color: var(--secondary);
    font-weight: bold;
    margin-left: 0.25rem;
}

/* Input States */
input:not([type="submit"]):not([type="button"]):not([type="reset"]),
textarea,
select {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.2s ease;
}

input:hover,
textarea:hover,
select:hover {
    border-color: var(--primary);
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--primary);
    outline: 3px solid rgba(0, 212, 255, 0.3);
    outline-offset: 2px;
}

/* Error States - WCAG 3.3.1 */
input:invalid:not(:placeholder-shown),
textarea:invalid:not(:placeholder-shown) {
    border-color: var(--secondary);
}

input[aria-invalid="true"],
textarea[aria-invalid="true"],
select[aria-invalid="true"] {
    border-color: var(--secondary);
    border-width: 3px;
}

/* Error Message Styling */
.error-message,
.form-error,
[role="alert"] {
    color: var(--secondary);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-weight: 600;
}

.error-message::before {
    content: "⚠";
    flex-shrink: 0;
}

/* Success States */
.success-message,
[role="status"] {
    color: #00ff88;
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.success-message::before {
    content: "✓";
    flex-shrink: 0;
}

/* Placeholder Contrast */
::placeholder {
    color: var(--text-muted);
    opacity: 1;
}

input:focus::placeholder,
textarea:focus::placeholder {
    opacity: 0.5;
}

/* ==================== 
   5. LANDMARK REGIONS - WCAG 1.3.1 
   ==================== */

/* Ensure landmarks are properly labeled */
header[role="banner"],
nav[role="navigation"],
main[role="main"],
aside[role="complementary"],
footer[role="contentinfo"] {
    /* Explicit landmark styling if needed */
}

/* Visual Landmark Separation */
main[role="main"] {
    min-height: 50vh;
}

/* ==================== 
   6. HEADING HIERARCHY - WCAG 1.3.1 
   ==================== */

/* Ensure proper heading visual hierarchy */
h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; line-height: 1.2; }
h2 { font-size: clamp(1.5rem, 4vw, 2.25rem); font-weight: 700; line-height: 1.3; }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); font-weight: 600; line-height: 1.4; }
h4 { font-size: clamp(1.125rem, 2.5vw, 1.5rem); font-weight: 600; line-height: 1.4; }
h5 { font-size: 1.125rem; font-weight: 600; line-height: 1.5; }
h6 { font-size: 1rem; font-weight: 600; line-height: 1.5; }

/* Heading Spacing */
h1, h2, h3, h4, h5, h6 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* First heading should not have top margin */
h1:first-child,
h2:first-child,
h3:first-child {
    margin-top: 0;
}

/* ==================== 
   7. IMAGE ACCESSIBILITY - WCAG 1.1.1 
   ==================== */

/* Decorative Images */
img[alt=""],
img[role="presentation"],
img[role="none"] {
    /* Properly ignored by screen readers */
}

/* Image Loading States */
img {
    max-width: 100%;
    height: auto;
}

img:not([alt]) {
    outline: 3px solid var(--secondary);
    outline-offset: 2px;
}

/* ==================== 
   8. INTERACTIVE ELEMENTS 
   ==================== */

/* Minimum Target Size - WCAG 2.5.5 (Enhanced) */
a,
button,
input[type="submit"],
input[type="button"],
input[type="reset"],
[role="button"],
[role="link"] {
    min-height: 44px; /* Minimum 44x44px touch target */
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1rem;
}

/* Exception for inline text links */
p a,
li a {
    min-height: auto;
    min-width: auto;
    padding: 0.125rem 0.25rem;
}

/* Button States */
button:disabled,
input:disabled,
select:disabled,
textarea:disabled,
[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* ==================== 
   9. ANIMATION & MOTION - WCAG 2.3.3 
   ==================== */

/* Respect Reduced Motion Preference */
@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;
    }
}

/* ==================== 
   10. TEXT SPACING - WCAG 1.4.12 
   ==================== */

/* Allow text spacing adjustments */
body {
    line-height: 1.6;
    word-spacing: 0.16em;
    letter-spacing: 0.01em;
}

p {
    line-height: 1.7;
    margin-bottom: 1rem;
    max-width: 75ch; /* Optimal reading width */
}

/* ==================== 
   11. ORIENTATION - WCAG 1.3.4 
   ==================== */

/* Support both portrait and landscape */
@media (orientation: landscape) {
    /* Ensure content works in landscape */
}

@media (orientation: portrait) {
    /* Ensure content works in portrait */
}

/* ==================== 
   12. HIGH CONTRAST MODE 
   ==================== */

/* Windows High Contrast Mode */
@media (prefers-contrast: high) {
    * {
        border-color: currentColor !important;
    }
    
    a {
        text-decoration: underline;
    }
    
    button,
    .btn {
        border: 2px solid currentColor;
    }
}

/* Forced Colors Mode */
@media (forced-colors: active) {
    * {
        forced-color-adjust: auto;
    }
}

/* ==================== 
   13. SCREEN READER ONLY 
   ==================== */

/* Visually Hidden but Accessible to Screen Readers */
.sr-only,
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Allow element to be focusable when navigated by keyboard */
.sr-only-focusable:focus,
.visually-hidden-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* ==================== 
   14. PRINT STYLES - WCAG 1.4.13 
   ==================== */

@media print {
    /* Ensure good contrast for printing */
    * {
        background: white !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    a,
    a:visited {
        text-decoration: underline;
        color: #000080 !important;
    }
    
    /* Show URLs after links */
    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
    }
    
    /* Don't show URLs for fragments or javascript */
    a[href^="#"]::after,
    a[href^="javascript:"]::after {
        content: "";
    }
    
    /* Page break controls */
    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
        page-break-inside: avoid;
    }
    
    p, img, blockquote {
        page-break-inside: avoid;
    }
}

/* ==================== 
   15. CUSTOM FOCUS INDICATORS 
   ==================== */

/* Search Input Focus */
#search-input:focus,
#search-box:focus {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 5px rgba(0, 212, 255, 0.2);
}

/* Navigation Focus */
.nav-link:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 5px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 0.5rem;
}

/* Card Focus */
.post-card:focus-within a:focus-visible {
    outline: none;
}

.post-card:focus-within {
    outline: 3px solid var(--primary);
    outline-offset: 3px;
    transform: translateY(-4px);
}

/* ==================== 
   16. LIVE REGIONS - WCAG 4.1.3
   ==================== */

/* Polite announcements */
[aria-live="polite"],
[role="status"] {
    /* Screen readers will announce when convenient */
}

/* Assertive announcements */
[aria-live="assertive"],
[role="alert"] {
    /* Screen readers will announce immediately */
    font-weight: 700;
}

/* Atomic regions */
[aria-atomic="true"] {
    /* Entire region will be announced */
}

/* ==================== 
   17. TABLE ACCESSIBILITY 
   ==================== */

table {
    border-collapse: collapse;
    width: 100%;
    margin: 2rem 0;
}

th {
    text-align: left;
    font-weight: 700;
    background: var(--bg-card);
    padding: 1rem;
    border: 1px solid var(--border-color);
}

td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
}

/* Zebra striping for better readability */
tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

[data-theme="light"] tbody tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

/* ==================== 
   18. TOOLTIP ACCESSIBILITY 
   ==================== */

[role="tooltip"] {
    position: absolute;
    z-index: 10000;
    background: var(--bg-darker);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    max-width: 300px;
}

/* ==================== 
   19. LANGUAGE ATTRIBUTE 
   ==================== */

/* Ensure lang attribute is set on HTML element */
[lang]:not(:lang(es)) {
    /* Different language content */
    font-style: italic;
}

/* ==================== 
   20. CONSISTENT IDENTIFICATION - WCAG 3.2.4 
   ==================== */

/* Ensure icons have consistent meanings */
.icon-external::after,
a[target="_blank"]::after {
    content: " ↗";
    font-size: 0.8em;
    margin-left: 0.25em;
}

/* Download links */
a[download]::before {
    content: "⬇ ";
    margin-right: 0.25em;
}