/* ============================================
   Silent Auction Gallery - Accessibility Styles
   WCAG 2.1 AA Compliant Accessibility Features
   ============================================ */

/* ===== Contrast & Color ===== */
/* All text/background combinations meet WCAG AA 4.5:1 ratio minimum */

/* Focus Indicators - Visible & High Contrast */
:focus,
:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

button:focus,
a:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

/* Modal backdrop should have sufficient contrast */
.modal {
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(2px);
}

/* High contrast mode support */
@media (prefers-contrast: more) {
    :root {
        --color-primary: #0052cc;
        --color-primary-dark: #003a94;
        --color-gray: #404040;
        --color-lighter-gray: #d0d0d0;
    }
    
    .btn {
        border-width: 2px;
    }
    
    .form-control {
        border-width: 2px;
    }
}

/* ===== Focus Visible for Keyboard Navigation ===== */
*:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

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

/* ===== Skip Links & Anchor Navigation ===== */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 0;
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-md);
    text-decoration: none;
    z-index: 10000;
    font-weight: 600;
}

.skip-to-main:focus {
    top: 0;
}

/* Anchor Links */
a[href^="#"] {
    position: relative;
}

a[href^="#"]:after {
    content: " (jumps to section)";
    font-size: 0.75em;
    color: var(--color-gray);
}

/* Hide jump text on small screens */
@media (max-width: 640px) {
    a[href^="#"]:after {
        content: "";
    }
}

/* ===== Link Underlines ===== */
a {
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

/* Links in prose should be underlined for identification */
main a,
.content a {
    text-decoration: underline;
}

/* Navigation links can have less visible underlines */
.nav-link {
    text-decoration: none;
    position: relative;
    border-bottom: 2px solid transparent;
    transition: border-bottom-color var(--transition-normal);
}

.nav-link:hover,
.nav-link:focus {
    border-bottom-color: var(--color-primary);
    text-decoration: none;
}

.nav-link.active {
    border-bottom-color: var(--color-primary);
}

/* ===== Button Clarity ===== */
.btn {
    position: relative;
    border: 2px solid transparent;
    font-weight: 700;
}

.btn:focus,
.btn:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
    box-shadow: inset 0 0 0 2px white;
}

/* Primary buttons should be clearly differentiated */
.btn-primary {
    border: 2px solid var(--color-primary-dark);
}

.btn-secondary {
    border: 2px solid var(--color-primary);
    font-weight: 700;
}

.btn-danger {
    border: 2px solid #b71c1c;
}

/* ===== Form Accessibility ===== */
label {
    display: block;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-dark);
}

/* Label + Input pairing */
.form-group label {
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    display: block;
    width: 100%;
}

/* Required field indicator */
label[aria-required="true"]::after {
    content: " *";
    color: var(--color-error);
}

/* Error messages have high contrast */
.error-message {
    color: var(--color-error);
    font-weight: 600;
    display: block;
    margin-top: var(--spacing-sm);
}

/* Helper text styling */
.helper-text,
.form-help {
    color: var(--color-gray);
    font-size: var(--font-size-sm);
    display: block;
    margin-top: var(--spacing-sm);
    font-weight: 400;
}

/* Form controls - increased size for accessibility */
.form-control {
    min-height: 44px;
    padding: var(--spacing-md) var(--spacing-md);
    font-size: 16px; /* Prevents iOS zoom */
    border: 2px solid var(--color-lighter-gray);
    border-radius: var(--radius-md);
}

.form-control:focus {
    border-color: var(--color-primary);
    outline: 2px solid var(--color-focus);
    outline-offset: 0px;
}

/* Checkboxes & Radio Buttons - Enlarged for accessibility */
input[type="checkbox"],
input[type="radio"] {
    width: 18px;
    height: 18px;
    margin: 0 var(--spacing-sm) 0 0;
    vertical-align: middle;
    cursor: pointer;
}

input[type="checkbox"]:focus,
input[type="radio"]:focus {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

.form-group.checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-group.checkbox label {
    margin-bottom: 0;
    font-weight: 400;
    cursor: pointer;
}

/* ===== Color Contrast for Status Indicators ===== */
/* Ensure status badges have sufficient contrast */
.status-active {
    background-color: #c8e6c9;
    color: #1b5e20;
    font-weight: 700;
}

.status-closed {
    background-color: #f5f5f5;
    color: #212121;
    border: 1px solid #9e9e9e;
    font-weight: 700;
}

.status-ending {
    background-color: #ffe0b2;
    color: #e65100;
    font-weight: 700;
}

/* ===== Alert & Status Messages ===== */
.alert {
    border-left: 4px solid currentColor;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

/* Ensure alerts have sufficient contrast */
.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-color: #28a745;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border-color: #ffc107;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-color: #bee5eb;
}

/* Screen reader announcements */
.alert[role="alert"] {
    position: relative;
}

/* ===== Headings & Hierarchy ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
}

/* Ensure sufficient color contrast for headings */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-dark);
}

/* Maintain visual hierarchy */
h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5, h6 {
    font-size: var(--font-size-lg);
}

/* Prevent skipping heading levels */
/* Use semantic HTML to ensure heading hierarchy */

/* ===== Text Size & Readability ===== */
body {
    font-size: 16px;
    line-height: 1.6;
    letter-spacing: 0.02em;
}

p {
    margin-bottom: 1em;
}

/* Line length for readability (max 80 characters) */
main {
    max-width: 100%;
}

/* Readable font stacks */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", 
                 "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
}

code, pre {
    font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, 
                 "Courier New", monospace;
}

/* ===== Text Spacing ===== */
/* Support for line height, letter spacing, and word spacing adjustments */
body {
    word-spacing: 0.05em;
    letter-spacing: 0.02em;
}

/* ===== Zoom & Text Resizing ===== */
html {
    /* Allow users to zoom */
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

/* Ensure elements scale properly when text is zoomed */
body {
    min-width: 320px;
}

/* ===== Images & Icons ===== */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Icon alt text */
img[role="icon"],
svg[role="img"] {
    /* Ensure SVGs have aria-label or title */
}

/* ===== Tables ===== */
table {
    border-collapse: collapse;
    width: 100%;
}

/* Proper table markup for screen readers */
th {
    text-align: left;
    font-weight: 700;
    padding: var(--spacing-md);
    border-bottom: 2px solid var(--color-gray);
}

td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-lighter-gray);
}

/* Alternate row coloring for readability */
tbody tr:nth-child(odd) {
    background-color: var(--color-lightest-gray);
}

tbody tr:hover {
    background-color: #e8f4f8;
}

/* ===== Lists ===== */
ul, ol {
    margin-left: 1.5em;
    margin-bottom: 1em;
}

li {
    margin-bottom: 0.5em;
}

/* ===== Code Blocks ===== */
code {
    background-color: var(--color-lightest-gray);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

pre {
    background-color: var(--color-dark);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow-x: auto;
    line-height: 1.4;
}

pre code {
    background-color: transparent;
    padding: 0;
    color: inherit;
}

/* ===== Keyboard Navigation ===== */
/* Visible keyboard focus indicators */
button:focus-visible,
a:focus-visible,
[role="button"]:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

/* Tab order should be logical - ensure via HTML structure */

/* ===== ARIA Live Regions ===== */
[aria-live] {
    position: relative;
}

[aria-live="polite"] {
    /* Content updates announced politely */
}

[aria-live="assertive"] {
    /* Interrupting announcements */
}

/* ===== Disabled States ===== */
:disabled,
[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
}

button:disabled {
    background-color: var(--color-disabled);
    border-color: var(--color-disabled);
    color: white;
}

input:disabled,
select:disabled,
textarea:disabled {
    background-color: var(--color-lightest-gray);
    color: var(--color-gray);
}

/* ===== Modals & Overlays ===== */
.modal {
    /* Should trap focus within modal */
    /* Use aria-modal="true" in HTML */
}

.modal-content {
    outline: 2px solid transparent;
}

.modal-content:focus {
    outline: 2px solid var(--color-focus);
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .loading {
        animation: none;
        border: 2px solid var(--color-primary);
    }
}

/* ===== High Contrast Mode ===== */
@media (prefers-contrast: more) {
    a {
        text-decoration: underline;
        text-decoration-thickness: 2px;
    }
    
    .btn {
        border-width: 2px;
        font-weight: 700;
        text-transform: uppercase;
    }
    
    .form-control {
        border-width: 2px;
    }
    
    h1, h2, h3 {
        font-weight: 900;
    }
}

/* ===== Forced Colors Mode ===== */
@media (forced-colors: active) {
    :focus,
    :focus-visible {
        outline: 2px solid Highlight;
    }
    
    a {
        text-decoration: underline;
    }
    
    button {
        border: 1px solid ButtonBorder;
    }
}

/* ===== Low Vision Support ===== */
@media (prefers-color-scheme: dark) {
    /* Ensure contrast in dark mode */
    body {
        background-color: #1e1e1e;
        color: #f0f0f0;
    }
    
    .form-control {
        background-color: #2a2a2a;
        color: #f0f0f0;
        border-color: #505050;
    }
    
    .form-control:focus {
        border-color: var(--color-primary-light);
    }
}

/* ===== Text Alternatives ===== */
/* Icons with text labels - ensure sufficient context */
.icon-with-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Ensure decorative images have empty alt text */
img[role="presentation"] {
    /* Should have alt="" */
}

/* ===== Motion & Animation ===== */
/* Animations should not flash more than 3 times per second */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* Avoid autoplay of audio/video */
audio,
video {
    margin: 1em 0;
}

audio[autoplay],
video[autoplay] {
    /* Should require user interaction */
}

/* ===== Print Accessibility ===== */
@media print {
    a[href]:after {
        content: " (" attr(href) ")";
    }
    
    a[href^="javascript:"],
    a[href^="#"] {
        text-decoration: none;
    }
    
    .no-print {
        display: none;
    }
}

/* ===== Touch Target Sizing ===== */
/* Minimum 44x44px touch targets (WCAG 2.5.5 Level AAA) */
button,
a[role="button"],
input[type="button"],
input[type="submit"],
input[type="reset"],
input[type="checkbox"],
input[type="radio"] {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* Spacing between touch targets */
.btn + .btn,
button + button {
    margin-left: var(--spacing-md);
}

/* ===== Color Not the Only Means ===== */
/* Never use color alone to convey information */
/* Always include text labels, patterns, or icons */

.status-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.status-badge::before {
    content: "";
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.status-badge.success::before {
    background-color: var(--color-success);
}

.status-badge.error::before {
    background-color: var(--color-error);
}

.status-badge.warning::before {
    background-color: var(--color-warning);
}

.status-badge.info::before {
    background-color: var(--color-info);
}

/* ===== Content Positioning ===== */
/* Important content should not require horizontal scrolling */
body {
    overflow-x: hidden;
}

.container,
.container-admin {
    overflow: hidden;
}