/**
 * jOpenSim Global Accessibility Stylesheet
 * WCAG 2.1 Level AA Compliance
 * 
 * Covers: skip-nav, focus-visible, reduced-motion, screen-reader utilities, 
 *         aria-live regions, keyboard interaction indicators, cookie consent
 */

/* ===== Skip Navigation Link ===== */
.zn-skip-nav {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100000;
    padding: 12px 24px;
    background: var(--zn-accent-primary, #3b82f6);
    color: #fff !important;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    border-radius: 0 0 8px 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transition: top 0.15s ease-in-out;
    white-space: nowrap;
}

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

/* ===== Focus Visible — Global Keyboard Focus Indicator ===== */
*:focus-visible {
    outline: 3px solid var(--zn-accent-primary, #3b82f6) !important;
    outline-offset: 2px !important;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.25) !important;
}

/* Remove default outline for mouse users */
*:focus:not(:focus-visible) {
    outline: none !important;
    box-shadow: none !important;
}

/* Specific focus styles for interactive elements */
a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible,
[tabindex="0"]:focus-visible {
    outline: 3px solid var(--zn-accent-primary, #3b82f6) !important;
    outline-offset: 2px !important;
    border-radius: 4px;
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--zn-accent-primary, #3b82f6) !important;
    outline-offset: 0 !important;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25) !important;
}

/* ===== Prefers Reduced Motion ===== */
@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;
    }
    
    .zn-skip-nav {
        transition: none;
    }
}

/* ===== Screen Reader Only (visually hidden but accessible) ===== */
.sr-only,
.visually-hidden {
    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;
}

/* ===== ARIA Live Regions ===== */
[aria-live="polite"],
[aria-live="assertive"] {
    /* Ensure live regions are part of the accessibility tree */
    position: relative;
}

/* Visual indicator for dynamic content updates (optional subtle animation) */
.zn-live-update {
    animation: znLiveFlash 0.3s ease-out;
}

@keyframes znLiveFlash {
    0%   { opacity: 0.7; }
    100% { opacity: 1; }
}

/* ===== Clickable Non-Button Elements — Keyboard Accessible ===== */
[role="button"] {
    cursor: pointer;
    user-select: none;
}

[role="button"]:hover {
    opacity: 0.9;
}

/* ===== High Contrast Mode Support ===== */
@media (forced-colors: active) {
    .zn-skip-nav {
        border: 2px solid ButtonText;
        background: Canvas;
        color: ButtonText !important;
    }
    
    *:focus-visible {
        outline: 3px solid Highlight !important;
    }
    
    .zn-cookie-banner {
        border: 2px solid ButtonText;
    }
}

/* ===== Cookie Consent Banner ===== */
.zn-cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 99999;
    background: var(--zn-bg-secondary, #1a1d23);
    border-top: 1px solid var(--zn-border-color, #30363d);
    padding: 16px 24px;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
    display: none; /* shown via JS when needed */
    font-family: inherit;
}

.zn-cookie-banner[aria-hidden="false"] {
    display: block;
}

.zn-cookie-banner-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
}

.zn-cookie-text {
    flex: 1;
    min-width: 280px;
    font-size: 14px;
    line-height: 1.5;
    color: var(--zn-text-secondary, #8b949e);
}

.zn-cookie-text a {
    color: var(--zn-accent-primary, #3b82f6);
    text-decoration: underline;
}

.zn-cookie-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.zn-cookie-btn {
    padding: 8px 20px;
    border-radius: 6px;
    border: 1px solid transparent;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
    white-space: nowrap;
}

.zn-cookie-btn-accept {
    background: var(--zn-accent-primary, #3b82f6);
    color: #fff;
    border-color: var(--zn-accent-primary, #3b82f6);
}

.zn-cookie-btn-accept:hover {
    background: #2563eb;
}

.zn-cookie-btn-reject {
    background: transparent;
    color: var(--zn-text-secondary, #8b949e);
    border-color: var(--zn-border-color, #30363d);
}

.zn-cookie-btn-reject:hover {
    background: var(--zn-surface-hover, #21262d);
    border-color: var(--zn-text-tertiary, #6e7681);
}

.zn-cookie-btn-settings {
    background: transparent;
    color: var(--zn-text-secondary, #8b949e);
    border-color: transparent;
    text-decoration: underline;
    padding: 8px 12px;
}

.zn-cookie-btn-settings:hover {
    color: var(--zn-text-primary, #e6edf3);
}

/* Cookie Settings Modal */
.zn-cookie-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 100000;
    background: rgba(0, 0, 0, 0.6);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.zn-cookie-modal-overlay.active {
    display: flex;
}

.zn-cookie-modal {
    background: var(--zn-bg-secondary, #1a1d23);
    border: 1px solid var(--zn-border-color, #30363d);
    border-radius: 12px;
    max-width: 520px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    padding: 24px;
}

.zn-cookie-modal h2 {
    margin: 0 0 16px;
    font-size: 18px;
    color: var(--zn-text-primary, #e6edf3);
}

.zn-cookie-category {
    padding: 12px 0;
    border-bottom: 1px solid var(--zn-border-color, #30363d);
}

.zn-cookie-category:last-child {
    border-bottom: none;
}

.zn-cookie-category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.zn-cookie-category-title {
    font-weight: 600;
    font-size: 14px;
    color: var(--zn-text-primary, #e6edf3);
}

.zn-cookie-category-desc {
    font-size: 12px;
    color: var(--zn-text-tertiary, #6e7681);
    margin-top: 4px;
    line-height: 1.4;
}

.zn-cookie-toggle {
    position: relative;
    width: 42px;
    height: 22px;
    flex-shrink: 0;
}

.zn-cookie-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.zn-cookie-toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--zn-surface-hover, #21262d);
    border-radius: 22px;
    cursor: pointer;
    transition: background 0.2s;
}

.zn-cookie-toggle-slider::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: #fff;
    border-radius: 50%;
    transition: transform 0.2s;
}

.zn-cookie-toggle input:checked + .zn-cookie-toggle-slider {
    background: var(--zn-accent-primary, #3b82f6);
}

.zn-cookie-toggle input:checked + .zn-cookie-toggle-slider::before {
    transform: translateX(20px);
}

.zn-cookie-toggle input:disabled + .zn-cookie-toggle-slider {
    opacity: 0.5;
    cursor: not-allowed;
}

.zn-cookie-modal-actions {
    margin-top: 20px;
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

/* Light theme overrides */
[data-theme="light"] .zn-cookie-banner {
    background: #fff;
    border-top-color: #d0d7de;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .zn-cookie-text {
    color: #57606a;
}

[data-theme="light"] .zn-cookie-modal {
    background: #fff;
    border-color: #d0d7de;
}

[data-theme="light"] .zn-cookie-category-title {
    color: #24292f;
}

[data-theme="light"] .zn-cookie-category-desc {
    color: #57606a;
}

/* Mobile responsive */
@media (max-width: 600px) {
    .zn-cookie-banner-inner {
        flex-direction: column;
        align-items: stretch;
    }
    
    .zn-cookie-actions {
        flex-direction: column;
    }
    
    .zn-cookie-btn {
        text-align: center;
    }
}