/**
 * GlitchRealm - Accessibility & Performance CSS
 * 
 * Styles for:
 * - Skip links
 * - Focus indicators
 * - Keyboard navigation highlights
 * - Image loading states
 */

/* ==================== SKIP LINK ==================== */
.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 999999;
    padding: 1em 1.5em;
    background: var(--primary-cyan, #16e1ff);
    color: var(--bg-primary, #0a0e27);
    text-decoration: none;
    font-weight: bold;
    border-radius: 0 0 8px 0;
    box-shadow: 0 4px 12px rgba(22, 225, 255, 0.5);
    transition: left 0.3s ease;
    font-family: 'Rajdhani', sans-serif;
    font-size: 16px;
}

.skip-link:focus {
    left: 0 !important;
    outline: 3px solid var(--primary-magenta, #ff4d6d);
    outline-offset: 2px;
}

/* ==================== FOCUS INDICATORS ==================== */
/* Enhanced focus styles for keyboard navigation */
*:focus-visible,
*.focus-visible {
    outline: 3px solid var(--primary-cyan, #16e1ff);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Buttons and interactive elements */
button:focus-visible,
a:focus-visible,
.nav-link:focus-visible,
.profile-action-btn:focus-visible {
    outline: 3px solid var(--primary-cyan, #16e1ff);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(22, 225, 255, 0.2);
}

/* Form inputs */
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary-cyan, #16e1ff);
    outline-offset: 1px;
    border-color: var(--primary-cyan, #16e1ff);
}

/* Game cards */
.game-card:focus-visible {
    outline: 3px solid var(--primary-cyan, #16e1ff);
    outline-offset: 4px;
    transform: translateY(-8px) scale(1.02);
    box-shadow: 
        0 0 20px rgba(22, 225, 255, 0.4),
        0 20px 60px rgba(0, 0, 0, 0.6);
}

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

/* ==================== NAVIGATION HIGHLIGHTS ==================== */
/* Dropdown menu keyboard navigation */
.nav-dropdown-link:focus {
    background: rgba(22, 225, 255, 0.1);
    color: var(--primary-cyan, #16e1ff);
}

.profile-action-btn:focus {
    background: rgba(22, 225, 255, 0.08);
    transform: translateX(4px);
}

/* Active menu item indicator */
.nav-dropdown-menu[aria-hidden="false"] .nav-dropdown-link:focus::before,
.profile-menu .profile-action-btn:focus::before {
    content: '▸';
    position: absolute;
    left: 8px;
    color: var(--primary-cyan, #16e1ff);
    font-size: 14px;
}

/* ==================== LOADING STATES ==================== */
/* Blur placeholder for lazy loading */
img[loading="lazy"]:not(.loaded) {
    filter: blur(10px);
    transform: scale(1.02);
    transition: filter 0.3s ease-out, transform 0.3s ease-out;
}

img.loaded {
    filter: none;
    transform: scale(1);
}

/* Skeleton loading animation */
@keyframes skeleton-loading {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

.skeleton-loading {
    background: linear-gradient(
        90deg,
        rgba(22, 225, 255, 0.05) 25%,
        rgba(22, 225, 255, 0.15) 50%,
        rgba(22, 225, 255, 0.05) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
}

/* Image loading spinner */
.image-loading {
    position: relative;
}

.image-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid rgba(22, 225, 255, 0.2);
    border-top-color: var(--primary-cyan, #16e1ff);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ==================== SCREEN READER ONLY ==================== */
.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: 0;
}

/* Allow screen reader text to be focusable */
.sr-only-focusable:focus,
.visually-hidden-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* ==================== HIGH CONTRAST MODE ==================== */
/* Support for Windows High Contrast Mode */
@media (prefers-contrast: high) {
    *:focus-visible {
        outline: 3px solid;
        outline-offset: 3px;
    }

    button,
    .btn {
        border: 2px solid currentColor;
    }

    .game-card {
        border: 2px solid;
    }
}

/* ==================== REDUCED MOTION ==================== */
/* 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;
    }

    .skip-link {
        transition: none;
    }

    img {
        transition: none;
    }

    .game-card {
        transition: none;
    }
}

/* ==================== KEYBOARD SHORTCUTS HELP ==================== */
.keyboard-shortcuts-help {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(10, 14, 39, 0.98);
    border: 2px solid var(--primary-cyan, #16e1ff);
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    z-index: 999999;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

.keyboard-shortcuts-help h3 {
    color: var(--primary-cyan, #16e1ff);
    margin-bottom: 1.5rem;
    font-family: 'Orbitron', sans-serif;
}

.keyboard-shortcuts-help dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.5rem 1rem;
}

.keyboard-shortcuts-help dt {
    color: var(--primary-magenta, #ff4d6d);
    font-weight: bold;
    font-family: 'Courier New', monospace;
    background: rgba(255, 77, 109, 0.1);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.keyboard-shortcuts-help dd {
    color: var(--text-primary, #d9f7ff);
}

/* ==================== ARIA LIVE REGIONS ==================== */
/* Polite announcements */
[aria-live="polite"] {
    position: relative;
}

/* Ensure live regions are not visually hidden */
[aria-live]:empty::before {
    content: '';
    display: block;
}

/* ==================== RESPONSIVE FOCUS INDICATORS ==================== */
/* Larger touch targets on mobile */
@media (max-width: 768px) {
    button,
    a,
    input,
    select,
    textarea {
        min-height: 44px;
        min-width: 44px;
    }

    .nav-link,
    .profile-action-btn {
        padding: 1rem;
    }

    *:focus-visible {
        outline-width: 4px;
        outline-offset: 3px;
    }
}

/* ==================== DARK MODE ADJUSTMENTS ==================== */
@media (prefers-color-scheme: dark) {
    .skip-link {
        background: var(--primary-cyan, #16e1ff);
        color: #000;
    }

    *:focus-visible {
        outline-color: var(--primary-cyan, #16e1ff);
    }
}

/* ==================== PRINT STYLES ==================== */
@media print {
    .skip-link,
    .nav,
    .profile-dropdown,
    .auth-overlay,
    button {
        display: none !important;
    }

    *:focus {
        outline: none;
    }
}

/* ==================== IMAGE OPTIMIZATION ==================== */
/* Aspect ratio boxes to prevent layout shift */
.img-wrapper {
    position: relative;
    overflow: hidden;
}

.img-wrapper::before {
    content: '';
    display: block;
    padding-top: 56.25%; /* 16:9 aspect ratio */
}

.img-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Progressive enhancement for WebP */
.webp img[data-webp] {
    content: attr(data-webp);
}

/* Native lazy loading fallback handled by JavaScript */

/* ==================== CONNECTION QUALITY INDICATORS ==================== */
/* Low quality mode indicator */
body.low-quality-mode::before {
    content: 'Low bandwidth mode active';
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 0.5rem 1rem;
    background: rgba(255, 77, 109, 0.2);
    color: var(--primary-magenta, #ff4d6d);
    border: 1px solid var(--primary-magenta, #ff4d6d);
    border-radius: 6px;
    font-size: 12px;
    z-index: 9999;
    pointer-events: none;
}