/* Quiz Platform Styles */
/* ==================== */

/* CSS Variables for consistent theming */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    
    /* Code theme colors */
    --code-bg: #1e1e1e;
    --code-border: #333;
    --code-text: #d4d4d4;
    
    /* Animation timings */
    --transition-fast: 0.2s;
    --transition-medium: 0.3s;
    --transition-slow: 0.5s;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 3rem;
}

/* Base Layout Styles */
/* ================== */

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
}

.platform-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-xl) 0;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.breadcrumb-nav {
    background: rgba(255, 255, 255, 0.95);
    padding: 10px 20px;
    border-radius: 25px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.breadcrumb-nav .breadcrumb {
    margin: 0;
    background: none;
    padding: 0;
}

.breadcrumb-nav .breadcrumb-item a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all var(--transition-fast) ease;
}

.breadcrumb-nav .breadcrumb-item a:hover {
    text-decoration: underline;
    color: var(--info-color);
}

/* Navigation Buttons */
/* ================== */

.back-btn,
.stop-quiz-btn {
    position: fixed;
    top: 20px;
    z-index: 1000;
    border: none;
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    transition: all var(--transition-medium) ease;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    cursor: pointer;
}

.back-btn {
    left: 20px;
    background: var(--secondary-color);
}

.back-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.stop-quiz-btn {
    right: 20px;
    background: var(--danger-color);
}

.stop-quiz-btn:hover {
    background: #c82333;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(220, 53, 69, 0.4);
}

/* Card Styles */
/* ============ */

.category-card,
.quiz-card {
    transition: transform var(--transition-medium) ease-in-out, 
                box-shadow var(--transition-medium) ease-in-out,
                border-color var(--transition-medium) ease;
    cursor: pointer;
    border: 2px solid transparent;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    overflow: hidden;
    position: relative;
}

.category-card:hover,
.quiz-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

.quiz-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.category-card:active,
.quiz-card:active {
    transform: translateY(-4px);
}

.category-icon,
.quiz-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform var(--transition-medium) ease;
}

.quiz-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.category-card:hover .category-icon,
.quiz-card:hover .quiz-icon {
    transform: scale(1.1);
}

.difficulty-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Question Enhancement Styles */
/* ============================ */

.choice-controls {
    padding: 10px 0;
    margin: var(--spacing-md) 0;
}

.show-choices-btn {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-medium) ease;
    box-shadow: 0 2px 4px rgba(0, 123, 255, 0.3);
}

.show-choices-btn:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.4);
}

.show-choices-btn:active {
    transform: translateY(0);
}

.countdown-display {
    display: inline-block;
    margin-left: 15px;
    font-style: italic;
    color: #666;
    animation: pulse 2s infinite;
    font-weight: 500;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

.question-title-enhanced {
    margin-bottom: 15px;
    font-weight: 600;
    color: #333;
    line-height: 1.6;
}

.quiz-title-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 10px 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.sv-string-viewer,
.sd-string-viewer {
    white-space: pre-line;
    line-height: 1.6;
}

.question-enhancement {
    margin: var(--spacing-md) 0;
}

.question-enhancement .alert {
    border-radius: 8px;
    border: 1px solid #bbdefb;
    background-color: #e3f2fd;
    padding: 12px 16px;
    margin: 15px 0;
}

/* Code Display Styles */
/* =================== */

.source-code-question .code-choice,
.code-choice {
    background: var(--code-bg);
    border: 2px solid var(--code-border);
    border-radius: 12px;
    padding: 20px;
    margin: 15px 0;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all var(--transition-medium) ease;
    position: relative;
    cursor: pointer;
}

.source-code-question .code-choice:hover,
.code-choice:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* Radio button styling for better accessibility */
input[type="radio"] {
    position: absolute;
    opacity: 0;
    z-index: -1;
    width: 0;
    height: 0;
}

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

/* Selected choice styling */
input[type="radio"]:checked + .sd-item__decorator + .sd-item__control-label .code-choice,
input[type="radio"]:checked ~ .code-choice,
.sd-selectbase__item--checked .code-choice {
    border-color: var(--success-color);
    background: #1a2f1a;
    box-shadow: 0 0 0 2px rgba(40, 167, 69, 0.3);
}

.sd-selectbase__label,
.sv-selectbase__label {
    cursor: pointer;
    display: block;
    width: 100%;
    padding: 0;
    margin: 0;
    transition: all var(--transition-fast) ease;
}

/* Code formatting */
pre {
    background-color: var(--code-bg) !important;
    border: 1px solid var(--code-border) !important;
    border-radius: 6px;
    padding: 16px;
    margin: 12px 0;
    overflow-x: auto;
    font-family: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    color: var(--code-text) !important;
    white-space: pre-wrap;
    scrollbar-width: thin;
    scrollbar-color: #666 #333;
    position: relative;
}

pre::-webkit-scrollbar {
    height: 8px;
    width: 8px;
}

pre::-webkit-scrollbar-track {
    background: #333;
    border-radius: 4px;
}

pre::-webkit-scrollbar-thumb {
    background: #666;
    border-radius: 4px;
}

pre::-webkit-scrollbar-thumb:hover {
    background: #888;
}

code {
    font-family: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    white-space: pre;
    color: var(--code-text) !important;
    background: transparent !important;
}

/* NA Choice Styling */
/* ================== */

.source-code-question .na-choice,
.na-choice {
    padding: 20px;
    background: linear-gradient(135deg, #2c3e50, #34495e);
    border: 2px solid #5a6c7d;
    border-radius: 12px;
    text-align: center;
    color: #ecf0f1;
    font-style: italic;
    font-weight: 500;
    transition: all var(--transition-medium) ease;
    cursor: pointer;
    position: relative;
}

.source-code-question .na-choice:hover,
.na-choice:hover {
    background: linear-gradient(135deg, #34495e, #2c3e50);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

/* Selected NA choice */
input[type="radio"]:checked + .sd-item__decorator + .sd-item__control-label .na-choice,
input[type="radio"]:checked ~ .na-choice,
.sd-selectbase__item--checked .na-choice {
    border-color: var(--success-color);
    background: linear-gradient(135deg, #1e3a1e, #2d5a2d);
    box-shadow: 0 0 0 2px rgba(40, 167, 69, 0.3);
}

/* Copy Button Styles */
/* =================== */

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0, 123, 255, 0.8);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 5px 10px;
    font-size: 12px;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-medium) ease;
    z-index: 10;
}

.code-choice:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: rgba(0, 123, 255, 1);
    transform: scale(1.05);
}

.copy-success {
    background: var(--success-color) !important;
}

.copy-error {
    background: var(--danger-color) !important;
}

/* Syntax Highlighting */
/* =================== */

.python-keyword { 
    color: #569cd6; 
    font-weight: bold; 
}

.python-string { 
    color: #ce9178; 
}

.python-comment { 
    color: #6a9955; 
    font-style: italic; 
}

.python-number { 
    color: #b5cea8; 
}

.python-function { 
    color: #dcdcaa; 
}

.python-operator { 
    color: #d4d4d4; 
}

/* Legacy syntax highlighting for backward compatibility */
pre code .keyword { color: #569cd6; font-weight: bold; }
pre code .string { color: #ce9178; }
pre code .comment { color: #6a9955; font-style: italic; }
pre code .number { color: #b5cea8; }
pre code .function { color: #dcdcaa; }
pre code .operator { color: #d4d4d4; }

/* Language-specific highlighting */
.language-python {
    color: var(--code-text);
}

/* Results and Progress Styles */
/* ============================ */

.results-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.score-summary,
.progress-summary {
    background: var(--light-color);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.score-summary {
    text-align: center;
}

.stat-card {
    background: white;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 10px;
    transition: transform var(--transition-fast) ease;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-card h4 {
    margin-bottom: 5px;
    color: var(--primary-color);
    font-weight: bold;
}

.stat-card p {
    margin: 0;
    color: #6c757d;
    font-size: 0.9em;
}

.question-review {
    background: #fff;
    border: 1px solid #dee2e6;
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 8px;
    transition: box-shadow var(--transition-fast) ease;
}

.question-review:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.correct-question {
    border-left: 4px solid var(--success-color);
    background: #f8fff9;
}

.incorrect-question {
    border-left: 4px solid var(--danger-color);
    background: #fff8f8;
}

.question-title-truncated {
    font-size: 0.9em;
    color: #6c757d;
    font-style: italic;
    margin-bottom: 10px;
    line-height: 1.4;
}

.wrong-answer {
    color: var(--danger-color);
    font-weight: bold;
}

.correct-answer {
    color: var(--success-color);
    font-weight: bold;
}

.perfect-score {
    font-size: 1.2em;
    color: var(--success-color);
    text-align: center;
    font-weight: bold;
    padding: 20px;
    background: #f8fff9;
    border-radius: 8px;
    border: 2px solid var(--success-color);
}

.action-buttons {
    text-align: center;
    margin-top: 20px;
}

.action-buttons .btn {
    margin: 0 5px;
    min-width: 120px;
}

/* Failed Questions Section */
.failed-questions {
    margin-top: 20px;
}

.failed-questions h4 {
    color: var(--danger-color);
    border-bottom: 2px solid var(--danger-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.answered-questions {
    margin-top: 20px;
}

.answered-questions h4 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

/* Progress Bar Styling */
/* ==================== */

.progress {
    height: 25px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    font-weight: bold;
    line-height: 25px;
    transition: width 0.6s ease;
    background: linear-gradient(45deg, var(--primary-color), var(--info-color));
}

/* Loading and Error States */
/* ========================= */

.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.error-state {
    background: #fff5f5;
    border: 1px solid #fed7d7;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
}

.error-state h4 {
    color: var(--danger-color);
    margin-bottom: 10px;
}

/* Alert Styles */
.alert {
    padding: 12px 20px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    border-radius: 8px;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #b6d4da;
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeaa7;
}

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

/* Radio Labels Wrapper */
.radio-labels-wrapper {
    display: block;
    width: 100%;
}

/* Pattern Badge */
.pattern-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--success-color), #20c997);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Responsive Design */
/* ================== */

@media (max-width: 768px) {
    .platform-header {
        padding: var(--spacing-lg) 0;
    }
    
    .category-icon,
    .quiz-icon {
        font-size: 2.5rem;
    }
    
    .back-btn,
    .stop-quiz-btn {
        position: relative;
        margin: 10px;
        width: calc(50% - 20px);
        text-align: center;
        top: auto;
        left: auto;
        right: auto;
    }
    
    .code-choice {
        padding: 15px;
        margin: 10px 0;
    }
    
    .copy-btn {
        position: relative;
        top: auto;
        right: auto;
        margin-top: 10px;
        opacity: 1;
        display: block;
        width: 100%;
    }
    
    .results-container {
        padding: 10px;
    }
    
    .stat-card {
        margin-bottom: 15px;
    }
    
    .breadcrumb-nav {
        padding: 8px 15px;
        margin: 0 10px;
    }
    
    .choice-controls {
        text-align: center;
    }
    
    .show-choices-btn {
        width: 100%;
        margin-bottom: 10px;
    }
    
    .countdown-display {
        display: block;
        margin-left: 0;
        text-align: center;
    }
}

@media (max-width: 576px) {
    .platform-header h1 {
        font-size: 2rem;
    }
    
    .category-card,
    .quiz-card {
        margin-bottom: 1rem;
    }
    
    .difficulty-badge {
        font-size: 0.7rem;
        padding: 0.2rem 0.4rem;
    }
    
    .action-buttons .btn {
        display: block;
        width: 100%;
        margin: 5px 0;
    }
}

/* Accessibility Improvements */
/* =========================== */

.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;
}

/* Focus styles for better keyboard navigation */
.quiz-card:focus,
.category-card:focus,
.show-choices-btn:focus,
.back-btn:focus,
.stop-quiz-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .code-choice {
        border-width: 3px;
    }
    
    .category-card,
    .quiz-card {
        border-width: 3px;
    }
    
    .copy-btn {
        border: 2px solid white;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .countdown-display {
        animation: none;
    }
    
    .category-card:hover,
    .quiz-card:hover {
        transform: none;
    }
}

/* Dark mode support (future enhancement) */
@media (prefers-color-scheme: dark) {
    :root {
        --light-color: #2d3748;
        --dark-color: #f7fafc;
    }
    
    .category-card,
    .quiz-card {
        background: linear-gradient(135deg, #2d3748 0%, #4a5568 100%);
        color: #f7fafc;
    }
    
    .stat-card {
        background: #2d3748;
        color: #f7fafc;
    }
}

/* Print styles */
@media print {
    .back-btn,
    .stop-quiz-btn,
    .copy-btn,
    .choice-controls {
        display: none;
    }
    
    .code-choice {
        background: white;
        border: 1px solid #000;
        color: #000;
    }
    
    pre {
        background: white !important;
        color: black !important;
        border: 1px solid #000 !important;
    }
    
    .platform-header {
        background: white !important;
        color: black !important;
        box-shadow: none;
    }
    
    .category-card,
    .quiz-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #000;
    }
}

/* Loading states */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.loading-state .spinner-border {
    width: 3rem;
    height: 3rem;
    margin-bottom: 1rem;
}

/* Empty states */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #6c757d;
}

.empty-state h4 {
    color: #495057;
    margin-bottom: 1rem;
}

.empty-state .btn {
    margin-top: 1rem;
}

/* Enhancement for source code questions */
.source-code-question {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
}

/* Survey container styling */
#surveyContainer {
    min-height: 400px;
    width: 100%;
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

#surveyContainer .sv-root,
#surveyContainer .sd-root {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
}

/* Loading State Improvements */
.loading-state {
    padding: 60px 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.loading-state .spinner-border {
    width: 3rem;
    height: 3rem;
    border-width: 0.3em;
}

/* Survey Page Specific Styles */
#quizPage {
    min-height: 100vh;
    padding-top: 20px;
}

#quizPage .container {
    max-width: 1200px;
}

/* Override SurveyJS default styles that might be hiding content */
.sv-container-modern,
.sd-container-modern {
    max-width: none !important;
    margin: 0 !important;
    padding: 0 !important;
}

.sv-page,
.sd-page {
    background: white !important;
    border-radius: 8px !important;
    padding: 20px !important;
    margin-bottom: 20px !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1) !important;
}

.sv-question,
.sd-question {
    margin-bottom: 20px !important;
}

.sv-string-viewer,
.sd-string-viewer {
    white-space: pre-line !important;
    line-height: 1.6 !important;
}

/* Ensure quiz page is visible */
#quizPage[style*="display: block"],
#quizPage:not([style*="display: none"]) {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

/* Debug styles to make containers visible */
.debug-container {
    border: 2px solid red !important;
    background: rgba(255, 0, 0, 0.1) !important;
}