/* ============================================
   Character Counter - Production CSS
   WCAG AA Compliant, Dark Mode, Responsive
   ============================================ */

:root {
    /* Light Mode Colors */
    --color-primary: #4F46E5;
    --color-primary-dark: #4338CA;
    --color-secondary: #7C3AED;
    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-warning: #F59E0B;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --border-color: #E5E7EB;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: "Courier New", monospace;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    html[data-theme="dark"] {
        --bg-primary: #111827;
        --bg-secondary: #1F2937;
        --text-primary: #F9FAFB;
        --text-secondary: #D1D5DB;
        --border-color: #374151;
        --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    }
}

html[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --border-color: #374151;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Accessibility: Skip Link */
.skip-link {
    position: absolute;
}

.skip-link a {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: var(--space-md);
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
}

.skip-link a:focus {
    left: 50%;
    top: var(--space-md);
    transform: translateX(-50%);
}

/* Screen Reader Only Text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md);
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2xl) var(--space-md);
    margin-bottom: var(--space-2xl);
    border-bottom: 2px solid var(--border-color);
}

.header-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--color-primary);
    line-height: var(--line-height-tight);
}

.header-content .tagline {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Theme Toggle Button */
.theme-toggle {
    padding: var(--space-md) var(--space-lg);
    background-color: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    font-size: 1.5rem;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    transform: scale(1.05);
}

.theme-toggle:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* Main Content */
.main-content {
    display: grid;
    gap: var(--space-2xl);
}

/* Sections */
.input-section,
.stats-section,
.reading-time-section,
.platform-section,
.details-section,
.ads-section {
    padding: var(--space-xl);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-light);
    transition: all var(--transition-normal);
}

.input-section:focus-within {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

/* Headings */
.section-heading {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

/* Labels */
.label {
    display: block;
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.label-inline {
    display: inline-block;
    margin-right: var(--space-md);
    font-weight: 500;
}

/* Textarea */
.textarea {
    width: 100%;
    min-height: 250px;
    padding: var(--space-lg);
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: var(--line-height-relaxed);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    resize: vertical;
    transition: all var(--transition-normal);
}

.textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.textarea::placeholder {
    color: var(--text-secondary);
}

/* Button Group */
.button-group {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    white-space: nowrap;
}

.btn:focus {
    outline: 2px solid currentColor;
    outline-offset: 2px;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--bg-primary);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.btn-danger {
    background-color: var(--color-danger);
    color: white;
}

.btn-danger:hover {
    background-color: #DC2626;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-icon {
    font-size: 1.2rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-lg);
}

.stat-card {
    padding: var(--space-lg);
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-normal);
}

.stat-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-sm);
}

.stat-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.stat-sublabel {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Reading Time Section */
.reading-time-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: center;
}

.reading-time-controls {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.wpm-select {
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.wpm-select:hover {
    border-color: var(--color-primary);
}

.wpm-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.reading-time-display {
    padding: var(--space-lg);
    background-color: var(--bg-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    text-align: center;
}

.reading-time-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-sm);
}

.reading-time-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Platform Grid */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.platform-card {
    padding: var(--space-lg);
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.platform-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.platform-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.platform-limit {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.platform-progress {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-sm);
    transition: width var(--transition-normal);
    width: 0%;
}

.progress-fill.warning {
    background: linear-gradient(90deg, var(--color-warning), var(--color-danger));
}

.progress-fill.danger {
    background: linear-gradient(90deg, var(--color-danger), #991B1B);
}

.progress-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: right;
}

/* Details Section */
.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
}

.detail-item {
    padding: var(--space-md);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.detail-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.detail-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* Hidden Class */
.hidden {
    display: none !important;
}

/* Ad Section */
.ad-placeholder {
    display: flex;
    justify-content: center;
    margin: var(--space-lg) 0;
}

#google_ads_1 {
    border-radius: var(--radius-md);
}

/* Footer */
.footer {
    margin-top: var(--space-2xl);
    padding: var(--space-xl) var(--space-md);
    border-top: 2px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.footer-content {
    text-align: center;
}

.footer-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.footer-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-normal);
}

.footer-link:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.footer-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    background-color: var(--color-success);
    color: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 300ms ease-in-out;
    z-index: 1000;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(400px);
        opacity: 0;
    }
}

.toast.removing {
    animation: slideOut 300ms ease-in-out;
}

/* Confirmation Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    animation: fadeIn 200ms ease-in-out;
}

.modal-overlay.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 90%;
    animation: modalSlide 300ms ease-in-out;
}

@keyframes modalSlide {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal h2 {
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.modal p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.modal-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: flex-end;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--space-sm);
    }

    .header {
        flex-direction: column;
        text-align: center;
        gap: var(--space-lg);
        padding: var(--space-lg) var(--space-md);
    }

    .header-content h1 {
        font-size: 2rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }

    .reading-time-container {
        grid-template-columns: 1fr;
    }

    .button-group {
        justify-content: center;
    }

    .btn {
        flex: 1;
        justify-content: center;
        min-width: 140px;
    }

    .platform-grid {
        grid-template-columns: 1fr;
    }

    .details-grid {
        grid-template-columns: 1fr;
    }

    .footer-links {
        gap: var(--space-md);
    }

    .stat-card,
    .detail-item {
        padding: var(--space-md);
    }

    .stat-value {
        font-size: 2rem;
    }

    .reading-time-value {
        font-size: 2rem;
    }

    .theme-toggle {
        padding: var(--space-md) var(--space-lg);
        font-size: 1.25rem;
    }

    .toast {
        left: var(--space-lg);
        right: var(--space-lg);
        bottom: var(--space-md);
    }

    .modal {
        width: 95%;
    }
}

@media (max-width: 480px) {
    .header-content h1 {
        font-size: 1.5rem;
    }

    .section-heading {
        font-size: 1.25rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .stat-value {
        font-size: 1.75rem;
    }

    .reading-time-value {
        font-size: 1.75rem;
    }

    .textarea {
        min-height: 200px;
        padding: var(--space-md);
    }

    .label-inline {
        display: block;
        margin-bottom: var(--space-sm);
    }
}

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

/* Print Styles */
@media print {
    body {
        background-color: white;
    }

    .header,
    .button-group,
    .theme-toggle,
    .ads-section,
    .footer {
        display: none;
    }

    .input-section,
    .stats-section,
    .reading-time-section,
    .platform-section,
    .details-section {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: more) {
    .stat-card,
    .platform-card,
    .detail-item {
        border-width: 3px;
    }

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

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   NEW AISO-OPTIMISED SECTIONS
   ============================================ */

/* Answer Intro Text */
.answer-intro {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: var(--space-lg) 0 var(--space-xl) 0;
    max-width: 700px;
    line-height: var(--line-height-relaxed);
}

/* Use Cases Section */
.use-cases-section {
    margin: var(--space-2xl) 0;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin: var(--space-lg) 0;
}

.use-case {
    background: var(--bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.use-case:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.use-case h3 {
    margin-top: 0;
    margin-bottom: var(--space-md);
    font-size: 1.1rem;
    color: var(--text-primary);
}

.use-case p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: var(--line-height-relaxed);
    margin: 0;
}

/* FAQ Section */
.faq-section {
    margin: var(--space-2xl) 0;
}

.faq-container {
    display: grid;
    gap: var(--space-lg);
    margin: var(--space-lg) 0;
}

.faq-item {
    background: var(--bg-secondary);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.faq-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-light);
}

.faq-question {
    margin-top: 0;
    margin-bottom: var(--space-md);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary);
    cursor: pointer;
    user-select: none;
}

.faq-question:hover {
    text-decoration: underline;
}

.faq-answer {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: var(--line-height-relaxed);
    margin: 0;
}

/* Comparison Table */
.comparison-table {
    border-collapse: collapse;
    width: 100%;
    margin: var(--space-lg) 0;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-light);
}

.comparison-table th {
    background: var(--color-primary);
    color: white;
    padding: var(--space-lg);
    text-align: left;
    font-weight: 600;
}

.comparison-table td {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

/* Author Section */
.author-section {
    background: linear-gradient(135deg, #f5f3ff 0%, #eef2ff 100%);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-lg);
}

html[data-theme="dark"] .author-section {
    background: linear-gradient(135deg, #312e81 0%, #1e1b4b 100%);
}

.author-section h3 {
    margin-top: 0;
    margin-bottom: var(--space-lg);
    font-size: 1.5rem;
    color: var(--text-primary);
}

.author-card {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-start;
}

.author-photo {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    background: var(--bg-primary);
}

.author-info h4 {
    margin: 0 0 var(--space-sm) 0;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.author-title {
    color: var(--color-primary);
    font-weight: 600;
    margin: var(--space-sm) 0 var(--space-md) 0;
    font-size: 0.95rem;
}

.author-bio {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: var(--line-height-relaxed);
    margin: 0 0 var(--space-md) 0;
}

.author-bio a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.author-bio a:hover {
    text-decoration: underline;
}

.updated-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
    font-weight: 500;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .author-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .author-photo {
        margin: 0 auto;
    }
}