/* ========================
   WCAG 2.1 AA Accessibility Styles
   ======================== */

/* ========================
   Skip Links
======================== */
.skip-links {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10001;
}

.skip-link {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    text-decoration: none;
    font-weight: 600;
    border-radius: 0 0 var(--radius-md) 0;
    transition: top var(--transition-fast);
    z-index: 10001;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}

/* ========================
   Focus Indicators (WCAG 2.4.7)
======================== */

/* Remove default outline for mouse users, keep for keyboard */
:focus {
    outline: none;
}

/* High-visibility focus indicator for keyboard users */
:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

/* Focus styles for specific elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 3px;
}

/* Focus styles for cards and interactive containers */
.project-card:focus-within,
.skill-category:focus-within,
.info-card:focus-within,
.timeline-content:focus-within {
    outline: 2px solid var(--primary-color);
    outline-offset: 4px;
}

/* Nav link focus */
.nav-link:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

/* Button focus enhancement */
.btn:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(6, 182, 212, 0.25);
}

/* Social link focus */
.social-link:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 3px;
    transform: translateY(-5px);
}

/* Theme toggle focus */
.theme-toggle:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 3px;
}

/* Form field focus enhancements */
.form-group input:focus-visible,
.form-group textarea:focus-visible {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.2);
    outline: none;
}

/* ========================
   Color Contrast Improvements (WCAG 1.4.3)
   Ensuring 4.5:1 ratio for normal text, 3:1 for large text
======================== */

/* Light mode contrast improvements */
:root {
    /* Improved secondary text - darker for better contrast */
    --text-secondary-accessible: #334155; /* Was #475569, now 7.1:1 ratio */
    --text-muted-accessible: #64748b; /* Was #94a3b8, now 4.7:1 ratio */
}

/* Dark mode contrast improvements */
[data-theme="dark"] {
    --text-secondary-accessible: #e2e8f0; /* Lighter for better contrast */
    --text-muted-accessible: #94a3b8; /* Lighter for better contrast */
}

/* Apply improved contrast to text elements */
p,
.hero-description,
.timeline-body li,
.highlight p,
.project-card-body p,
.case-study-section p {
    color: var(--text-secondary-accessible, var(--text-secondary));
}

.stat-label,
.timeline-date,
.skill-level,
.reading-time,
.meta-item,
.code-title {
    color: var(--text-muted-accessible, var(--text-muted));
}

/* Ensure link colors have sufficient contrast */
a {
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
}

a:hover {
    text-decoration: underline;
}

/* ========================
   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;
    }

    .floating-icon,
    .loader-spinner,
    .scroll-indicator,
    .parallax {
        animation: none !important;
    }

    .profile-img:hover {
        transform: none;
    }

    .btn-primary:hover,
    .btn-secondary:hover,
    .social-link:hover,
    .project-card:hover,
    .skill-category:hover {
        transform: none;
    }
}

/* ========================
   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;
}

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

/* ========================
   ARIA Live Regions
======================== */
/* Screen-reader-only live regions - but NOT chat messages which need to be visible */
[aria-live="polite"]:not(.chat-messages),
[aria-live="assertive"]:not(.chat-messages) {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Status messages container */
.status-message {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--surface);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px var(--shadow-color);
    z-index: 9999;
    max-width: 400px;
}

.status-message.success {
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.1);
}

.status-message.error {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
}

/* ========================
   Interactive Element Sizing (WCAG 2.5.5)
   Minimum 44x44px touch targets
======================== */
.nav-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.social-link {
    min-width: 44px;
    min-height: 44px;
}

.theme-toggle {
    min-width: 44px;
    min-height: 44px;
}

.hamburger {
    min-width: 44px;
    min-height: 44px;
    /* Note: display property controlled by main.css responsive styles */
    /* Only add touch target sizing here */
}

.back-to-top {
    min-width: 44px;
    min-height: 44px;
}

/* ========================
   Text Spacing (WCAG 1.4.12)
======================== */
.text-spacing-enhanced {
    line-height: 1.5 !important;
    letter-spacing: 0.12em !important;
    word-spacing: 0.16em !important;
}

/* ========================
   High Contrast Mode Support
======================== */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-primary: #000000;
        --text-secondary: #1a1a1a;
    }

    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-primary: #ffffff;
        --text-secondary: #f0f0f0;
    }

    .btn-primary,
    .btn-secondary {
        border: 2px solid currentColor;
    }

    .skill-bar {
        border: 1px solid var(--border-color);
    }

    .project-card,
    .skill-category,
    .info-card,
    .timeline-content {
        border: 2px solid var(--border-color);
    }
}

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

/* Error states with icons, not just color */
.form-group.error input,
.form-group.error textarea {
    border-color: #ef4444;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20'%3E%3Cpath fill='%23ef4444' d='M10 0C4.48 0 0 4.48 0 10s4.48 10 10 10 10-4.48 10-10S15.52 0 10 0zm1 15H9v-2h2v2zm0-4H9V5h2v6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    padding-right: calc(var(--spacing-md) * 3);
}

.form-group.success input,
.form-group.success textarea {
    border-color: #10b981;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20'%3E%3Cpath fill='%2310b981' d='M10 0C4.48 0 0 4.48 0 10s4.48 10 10 10 10-4.48 10-10S15.52 0 10 0zm-2 15l-5-5 1.41-1.41L8 12.17l7.59-7.59L17 6l-9 9z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    padding-right: calc(var(--spacing-md) * 3);
}

/* Error message styling */
.form-error {
    color: #dc2626;
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-error::before {
    content: "\f071";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
}

/* Required field indicator */
.form-group label.required::after {
    content: " *";
    color: #ef4444;
    font-weight: bold;
}

/* ========================
   Loading State Announcements
======================== */
.loader[aria-busy="true"]::after {
    content: "Loading page content, please wait.";
    position: absolute;
    left: -10000px;
}

/* ========================
   Keyboard Navigation Helpers
======================== */

/* Visible keyboard shortcut hints */
[data-shortcut]::after {
    content: attr(data-shortcut);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: var(--spacing-sm);
    padding: 2px 6px;
    background: var(--surface-hover);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
}

/* Focus trap indicator for modals */
.focus-trap-active {
    outline: 2px dashed var(--primary-color);
    outline-offset: -2px;
}

/* ========================
   Print Accessibility
======================== */
@media print {
    .skip-links,
    [aria-hidden="true"] {
        display: none !important;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 0.8em;
        color: #666;
    }

    a[href^="#"]::after,
    a[href^="javascript:"]::after {
        content: "";
    }
}