/* ============================================================================
   AI Text Style Transfer Editor - Custom Frontend Styles
   ============================================================================ */

/* CSS Variables - Light Theme (default) */
:root,
[data-theme="light"] {
    --primary-color: #3498db;
    --primary-hover: #2980b9;
    --success-color: #27ae60;
    --success-hover: #219a52;
    --danger-color: #e74c3c;
    --danger-hover: #c0392b;
    --info-color: #9b59b6;
    --info-hover: #8e44ad;
    --warning-color: #f39c12;
    --dark-color: #2c3e50;
    --dark-secondary: #34495e;
    --light-color: #ecf0f1;
    --border-color: #ddd;
    --bg-color: #f5f5f5;
    --panel-bg: #f8f9fa;
    --text-color: #333;
    --text-muted: #666;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --table-hover: #f1f8ff;
    --table-selected: #cce5ff;
}

/* Dark Theme */
[data-theme="dark"] {
    --primary-color: #5dade2;
    --primary-hover: #3498db;
    --success-color: #2ecc71;
    --success-hover: #27ae60;
    --danger-color: #e74c3c;
    --danger-hover: #c0392b;
    --info-color: #bb8fce;
    --info-hover: #9b59b6;
    --warning-color: #f5b041;
    --dark-color: #1a1a2e;
    --dark-secondary: #16213e;
    --light-color: #e8e8e8;
    --border-color: #3d3d5c;
    --bg-color: #0f0f23;
    --panel-bg: #1a1a2e;
    --text-color: #e8e8e8;
    --text-muted: #a0a0a0;
    --card-bg: #1a1a2e;
    --input-bg: #16213e;
    --table-hover: #16213e;
    --table-selected: #2d3a5e;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    background: transparent;
    border: none;
    color: var(--light-color);
    font-size: 18px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 6px;
    transition: background-color 0.2s, transform 0.2s;
    margin-right: 10px;
}

.theme-toggle-btn:hover {
    background-color: var(--dark-secondary);
    transform: scale(1.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 25px;
}

/* Navigation */
.navbar {
    background-color: var(--dark-color);
    padding: 0 20px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    color: white;
    font-weight: 600;
    font-size: 1.3em;
    padding: 15px 0;
    margin-right: 30px;
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--light-color);
}

/* Navbar Links (right side) */
.navbar-links {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    margin-right: 15px;
}

.nav-link {
    color: var(--light-color);
    text-decoration: none;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    transition: background-color 0.2s, color 0.2s;
}

.nav-link:hover {
    background-color: var(--dark-secondary);
    color: white;
}

.nav-link i {
    margin-right: 5px;
}

.navbar-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-item {
    margin: 0;
}

.nav-item a {
    display: block;
    color: var(--light-color);
    text-decoration: none;
    padding: 18px 20px;
    font-weight: 500;
    transition: background-color 0.2s;
}

.nav-item a:hover {
    background-color: var(--dark-secondary);
}

.nav-item.active a {
    background-color: var(--dark-secondary);
    color: white;
}

.navbar-status {
    margin-left: auto;
    padding: 15px;
}

.status-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #ccc;
}

.status-indicator.connected {
    background-color: var(--success-color);
}

.status-indicator.disconnected {
    background-color: var(--danger-color);
}

/* Tab Content */
.tab-content {
    display: none;
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    margin-bottom: 30px;
    transition: background-color 0.3s;
}

.tab-content.active {
    display: block;
}

/* Layout */
.row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.col-left, .col-right {
    flex: 1;
    min-width: 0;
}

.col-half {
    flex: 1;
}

.col-third {
    flex: 1;
}

.col-sidebar {
    width: 280px;
    flex-shrink: 0;
}

.col-main {
    flex: 1;
}

/* Panels */
.panel {
    background-color: var(--panel-bg);
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 20px;
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s, background-color 0.3s;
    background-color: var(--input-bg);
    color: var(--text-color);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

textarea.form-control {
    resize: vertical;
    line-height: 1.6;
}

select[multiple] {
    height: auto;
}

/* Radio and Checkbox */
.radio-group {
    display: flex;
    gap: 20px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight: normal;
    cursor: pointer;
}

/* Sliders */
.slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: #e9ecef;
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: 2px solid white;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.85em;
    color: #666;
    margin-top: 5px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

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

.btn-success:hover:not(:disabled) {
    background-color: var(--success-hover);
}

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

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-hover);
}

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

.btn-info:hover:not(:disabled) {
    background-color: var(--info-hover);
}

.btn-default {
    background-color: #e9ecef;
    color: #333;
}

.btn-default:hover:not(:disabled) {
    background-color: #ddd;
}

.btn-lg {
    padding: 12px 30px;
    font-size: 16px;
    width: 100%;
}

/* Output Display */
.output-display {
    background-color: var(--panel-bg);
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 20px;
    min-height: 300px;
    white-space: pre-wrap;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 15px;
    line-height: 1.8;
}

/* Stats Box */
.stats-box {
    background-color: #e8f4f8;
    border-left: 4px solid var(--primary-color);
    padding: 15px;
    margin: 15px 0;
    border-radius: 0 6px 6px 0;
}

.stats-box h4 {
    margin-top: 0;
    color: var(--dark-color);
}

/* Word Count */
.word-count {
    font-size: 0.9em;
    margin-top: 5px;
}

.word-count.success {
    color: var(--success-color);
}

.word-count.warning {
    color: var(--warning-color);
}

.word-count.error {
    color: var(--danger-color);
}

/* Badge */
.word-count-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.85em;
    font-weight: 500;
}

.word-count-badge.success {
    background-color: var(--success-color);
    color: white;
}

.word-count-badge.warning {
    background-color: var(--warning-color);
    color: white;
}

/* Info Box */
.info-box {
    padding: 15px;
    border-radius: 6px;
    margin: 10px 0;
}

.info-box:not(.success):not(.error):not(.warning) {
    background-color: #e8f4f8;
    border-left: 4px solid var(--primary-color);
}

.info-box.success {
    background-color: #d4edda;
    border-left: 4px solid var(--success-color);
}

.info-box.error {
    background-color: #f8d7da;
    border-left: 4px solid var(--danger-color);
}

.info-box.warning {
    background-color: #fff3cd;
    border-left: 4px solid var(--warning-color);
}

/* Help Text */
.help-text {
    font-size: 0.85em;
    color: var(--text-muted);
    margin-top: 5px;
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.data-table thead th {
    background-color: var(--dark-secondary);
    color: white;
    padding: 12px 10px;
    text-align: left;
    font-weight: 500;
}

.data-table tbody tr {
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}

.data-table tbody tr:hover {
    background-color: var(--table-hover);
}

.data-table tbody tr.selected {
    background-color: var(--table-selected);
}

.data-table td {
    padding: 10px;
}

/* Question Card */
.question-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    transition: background-color 0.3s;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.question-category {
    background: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 0.9em;
}

.question-hint {
    color: #666;
    font-style: italic;
}

/* Progress Bar */
.progress-bar-container {
    height: 8px;
    background-color: #e9ecef;
    border-radius: 4px;
    margin-bottom: 20px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--success-color);
    border-radius: 4px;
    transition: width 0.3s;
}

/* Progress Sidebar */
.progress-sidebar {
    background: var(--panel-bg);
    border-radius: 8px;
    padding: 15px;
    max-height: 600px;
    overflow-y: auto;
}

.progress-stats {
    background: #e9ecef;
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 15px;
    font-size: 13px;
}

.question-list {
    font-size: 12px;
}

.question-list-item {
    padding: 8px 10px;
    margin-bottom: 4px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.question-list-item.current {
    background: var(--primary-color);
    color: white;
    font-weight: bold;
}

.question-list-item.complete {
    background: var(--success-color);
    color: white;
}

.question-list-item.partial {
    background: var(--warning-color);
    color: #212529;
}

.question-list-item.empty {
    background: #e9ecef;
    color: #6c757d;
}

/* Navigation Buttons */
.navigation-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}

/* Export Buttons */
.export-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 10px;
}

/* Placeholder Content */
.placeholder-content {
    text-align: center;
    padding: 50px;
    color: #999;
}

.placeholder-content i {
    font-size: 3em;
    margin-bottom: 15px;
    display: block;
}

/* Build Style Panels */
.build-panel {
    display: none;
}

.build-panel.active {
    display: block;
}

/* Requirements Table */
.requirements-table {
    width: 100%;
    font-size: 14px;
    margin: 10px 0;
}

.requirements-table th,
.requirements-table td {
    padding: 8px;
    text-align: left;
}

.requirements-table th {
    border-bottom: 2px solid #ddd;
}

.requirements-table td {
    border-bottom: 1px solid #eee;
}

/* Filters Row */
.filters-row {
    margin-bottom: 20px;
    align-items: flex-end;
}

/* Chain Step */
.chain-step {
    background-color: white;
    border: 1px solid #e9ecef;
    border-left: 4px solid var(--info-color);
    border-radius: 0 8px 8px 0;
    padding: 15px;
    margin-bottom: 15px;
}

.chain-step-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chain-step-number {
    display: inline-block;
    width: 30px;
    height: 30px;
    background-color: var(--info-color);
    color: white;
    border-radius: 50%;
    text-align: center;
    line-height: 30px;
    font-weight: bold;
    margin-right: 10px;
}

.chain-step-content {
    margin-top: 10px;
    padding: 10px;
    background: var(--panel-bg);
    border-radius: 4px;
    max-height: 150px;
    overflow-y: auto;
    white-space: pre-wrap;
}

/* Metrics Display */
.metrics-display {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.metric-badge {
    background: #e9ecef;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9em;
}

/* Analysis Text */
.analysis-text {
    font-style: italic;
    color: #555;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 8px;
    max-width: 400px;
    width: 90%;
    color: var(--text-color);
    transition: background-color 0.3s;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 0.9em;
}

/* Loading Spinner */
.fa-spin {
    animation: fa-spin 1s infinite linear;
}

@keyframes fa-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .row {
        flex-direction: column;
    }
    
    .col-sidebar {
        width: 100%;
    }
    
    .navbar {
        flex-wrap: wrap;
    }
    
    .navbar-nav {
        width: 100%;
        justify-content: center;
    }
    
    .navbar-status {
        width: 100%;
        text-align: center;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-animation {
    animation: fadeIn 0.3s ease-out;
}

/* Page load fade-in for tabs */
.tab-content.active {
    animation: fadeIn 0.3s ease-out;
}

/* Card/Panel hover effect */
.panel {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.panel:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Button click feedback */
.btn {
    transition: transform 0.1s ease, box-shadow 0.2s ease;
}

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

/* Loading skeleton animation */
.skeleton {
    background: linear-gradient(90deg, var(--panel-bg) 25%, var(--border-color) 50%, var(--panel-bg) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Smooth transitions for theme toggle */
body, .navbar, .panel, .card, .btn, input, textarea, select {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Pulse animation for loading indicators */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading-pulse {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Slide in animation for notifications */
@keyframes slideInRight {
    from { 
        opacity: 0; 
        transform: translateX(100px); 
    }
    to { 
        opacity: 1; 
        transform: translateX(0); 
    }
}

.notification {
    animation: slideInRight 0.3s ease-out;
}

/* ============================================================================
   ACCESSIBILITY FEATURES
   ============================================================================ */

/* Focus styles for keyboard navigation */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Remove default outline for mouse users but keep for keyboard */
*:focus:not(:focus-visible) {
    outline: none;
}

/* Enhanced focus for keyboard users */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Focus ring for buttons */
.btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.25);
}

/* Focus ring for form inputs */
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 0;
    border-color: var(--primary-color);
}

/* Focus ring for links */
a:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 2px;
}

/* Skip to main content link (for screen reader users) */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    z-index: 9999;
    text-decoration: none;
    font-weight: 600;
}

.skip-link:focus {
    top: 0;
}

/* 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;
}

/* Reduced motion for users who prefer it */
@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;
    }
}