/* PBAC Training Course - Styles */
/* ======================================================== */

/* CSS Variables */
:root {
    /* Primary Colors */
    --primary-bg: #0f172a;
    --secondary-bg: #1e293b;
    --surface-color: #334155;
    --surface-light: #475569;
    
    /* AI Theme Colors */
    --ai-blue: #3b82f6;
    --ai-purple: #8b5cf6;
    --ai-green: #10b981;
    --ai-orange: #f97316;
    --ai-red: #ef4444;
    --ai-pink: #ec4899;
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #c5d4e3;
    --text-inverse: #0f172a;
    
    /* Border & Accent Colors */
    --border-color: #475569;
    --border-light: #64748b;
    --code-bg: #1e293b;
    
    /* Gradients */
    --gradient-ai: linear-gradient(135deg, var(--ai-blue) 0%, var(--ai-purple) 100%);
    --gradient-success: linear-gradient(135deg, var(--ai-green) 0%, #22c55e 100%);
    --gradient-warning: linear-gradient(135deg, var(--ai-orange) 0%, #fb923c 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Font */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Fira Code', 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Sans', monospace;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Course Container */
.course-container {
    display: grid;
    grid-template-rows: auto 1fr;
    min-height: 100vh;
}

/* Header */
.course-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--secondary-bg) 0%, var(--surface-color) 100%);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.ai-icon {
    font-size: 2rem;
    animation: pulse 2s infinite;
}

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

.course-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-ai);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.progress-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.progress-bar {
    width: 200px;
    height: 8px;
    background: var(--surface-light);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-ai);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.user-stats {
    display: flex;
    gap: var(--spacing-lg);
}

.score-display, .confidence-level {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.score-display span, .confidence-level span {
    color: #6ee7b7;
    font-weight: 600;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 280px 1fr 350px;
    min-height: calc(100vh - 70px);
}

/* Sidebar */
.sidebar {
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.nav-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.nav-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.nav-item:hover:not(.locked) {
    background: var(--surface-light);
}

.nav-item.active {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    border-left: 3px solid var(--ai-blue);
}

.nav-item.completed {
    background: rgba(16, 185, 129, 0.1);
}

.nav-item.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.nav-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-muted);
    flex-shrink: 0;
}

.nav-item.active .nav-indicator {
    background: var(--ai-blue);
}

.nav-item.completed .nav-indicator {
    background: var(--ai-green);
}

.nav-item.locked .nav-indicator {
    background: var(--text-muted);
}

.lesson-title {
    font-size: 0.875rem;
    color: var(--text-primary);
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-section-header {
    padding: var(--spacing-sm) var(--spacing-md) !important;
    font-size: 0.75rem !important;
    color: var(--text-muted) !important;
    text-transform: uppercase !important;
    letter-spacing: 0.1em !important;
    border-bottom: 1px solid var(--border-color);
}

/* Level Badges */
.level-badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-full);
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid transparent;
}

.level-badge.beginner {
    background: var(--surface-color);
    color: #34d399;
    border-color: rgba(16, 185, 129, 0.4);
}

.level-badge.intermediate {
    background: var(--surface-color);
    color: #7cc3fd;
    border-color: rgba(59, 130, 246, 0.4);
}

.level-badge.advanced {
    background: var(--surface-color);
    color: #c4b5fd;
    border-color: rgba(139, 92, 246, 0.4);
}

.level-badge.expert {
    background: var(--surface-color);
    color: #fdba74;
    border-color: rgba(249, 115, 22, 0.4);
}

.level-badge.research {
    background: var(--surface-color);
    color: #fca5a5;
    border-color: rgba(239, 68, 68, 0.4);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--surface-light);
    border-radius: var(--radius-md);
    text-align: center;
}

.stat-label {
    font-size: 0.625rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: #7cc3fd;
}

.stat-subtext {
    font-size: 0.625rem;
    color: var(--text-muted);
}

/* Content Area */
.content-area {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

/* Links inside lesson content — use a brighter blue for AA contrast */
.content-area a,
.lesson-content a,
.lab-output a,
.lesson-content summary,
.cloud-guide summary {
    color: #a5d4ff;
}
.content-area a:hover,
.lesson-content a:hover,
.content-area a:focus,
.lesson-content a:focus {
    text-decoration: underline;
}

.lesson-container {
    flex: 1;
    padding: var(--spacing-xl);
    overflow-y: auto;
    max-height: calc(100vh - 70px);
}

/* Lesson Content */
.lesson-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.lesson-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-ai);
    border-radius: var(--radius-lg);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-inverse);
}

.lesson-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.lesson-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
}

.lesson-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.lesson-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.lesson-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: var(--spacing-sm);
}

.lesson-section p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.9375rem;
}

.lesson-section ul {
    list-style: disc;
    padding-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.lesson-section li {
    margin-bottom: var(--spacing-sm);
}

.lesson-section table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-md) 0;
}

.lesson-section th,
.lesson-section td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.lesson-section th {
    color: var(--text-primary);
    font-weight: 600;
    background: var(--surface-light);
}

.lesson-section td {
    color: var(--text-secondary);
}

.lesson-section tr:hover {
    background: rgba(59, 130, 246, 0.05);
}

/* Math Display */
.math-display {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--code-bg);
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    text-align: center;
}

.math-display p {
    color: var(--text-primary);
    margin: 0;
}

/* Code Examples */
.code-example {
    margin: var(--spacing-lg) 0;
    border-left: 4px solid var(--ai-purple);
}

.code-caption {
    background: var(--surface-light);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.code-example pre {
    margin: 0;
    padding: var(--spacing-lg);
    background: var(--code-bg);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    overflow-x: auto;
    font-size: 0.8125rem;
    font-family: var(--font-mono);
    line-height: 1.6;
}

.code-example code {
    color: var(--text-primary);
    font-family: var(--font-mono);
}

/* Interactive Panel */
.interactive-panel {
    background: var(--surface-color);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    max-width: 350px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.toggle-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
}

.toggle-btn:hover {
    background: var(--ai-blue);
    color: var(--text-inverse);
}

.panel-content {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.animation-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

#aiCanvas,
#fullCanvas {
    width: 100%;
    height: 300px;
    background: var(--code-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.animation-controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.animation-controls button {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.8125rem;
}

.animation-controls button:hover {
    background: var(--ai-blue);
    color: var(--text-inverse);
}

.quiz-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-ai);
    color: var(--text-inverse);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-small {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.8125rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-small:hover {
    background: var(--ai-blue);
    color: var(--text-inverse);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(5px);
    z-index: 10000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

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

.close-modal {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 2rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    line-height: 1;
}

.close-modal:hover {
    color: var(--ai-red);
}

.modal-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--ai-green);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.modal-content p {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.final-stats {
    display: flex;
    justify-content: space-around;
    margin: var(--spacing-xl) 0;
}

.final-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.final-stat .stat-name {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.final-stat .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--ai-blue);
}

.weak-areas {
    margin: var(--spacing-xl) 0;
}

.weak-areas h4 {
    font-size: 0.9375rem;
    color: var(--ai-orange);
    margin-bottom: var(--spacing-md);
}

.weak-areas ul {
    list-style: disc;
    padding-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.weak-areas li {
    margin-bottom: var(--spacing-sm);
}

/* Loading Screen */
.loading-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100%;
}

.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    color: var(--text-secondary);
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--surface-light);
    border-top-color: var(--ai-blue);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-content h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.loading-content p {
    font-size: 0.9375rem;
}

/* Quiz System */
.quiz-display {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.quiz-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.quiz-info {
    display: flex;
    gap: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.quiz-question {
    padding: var(--spacing-lg);
    background: var(--surface-light);
    border-radius: var(--radius-md);
}

.quiz-question h3 {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.quiz-option:hover {
    border-color: var(--ai-blue);
}

.quiz-option.selected {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--ai-blue);
}

.quiz-option.correct {
    background: rgba(16, 185, 129, 0.2);
    border-color: var(--ai-green);
}

.quiz-option.incorrect {
    background: rgba(239, 68, 68, 0.2);
    border-color: var(--ai-red);
}

.quiz-option {
    cursor: pointer;
}

.quiz-option-label {
    font-size: 0.9375rem;
    color: var(--text-primary);
    flex: 1;
}

.option-letter {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-light);
    border-radius: 50%;
    font-weight: 700;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.quiz-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.quiz-results {
    padding: var(--spacing-lg);
    background: var(--surface-light);
    border-radius: var(--radius-md);
    text-align: center;
}

.quiz-score {
    font-size: 2rem;
    font-weight: 700;
    color: var(--ai-green);
    margin-bottom: var(--spacing-md);
}

.quiz-feedback {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* AI-Specific Animations */
@keyframes neuralNetworkPulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.1); opacity: 1; }
}

@keyframes attentionFlow {
    0% { stroke-dashoffset: 1000; }
    100% { stroke-dashoffset: 0; }
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        /* Keep all three columns but shrink the side panel so the quiz
           remains reachable on tablets. The original rule hid the panel
           entirely, which removed both the animations AND the quiz. */
        grid-template-columns: 240px 1fr 320px;
    }
}

/* Mobile navigation toggle visible only on small screens */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 0.5rem;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        width: 280px;
        z-index: 1000;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.mobile-open {
        transform: translateX(0);
    }

    .nav-toggle {
        display: inline-block;
    }

    .course-header {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    .progress-container {
        width: 100%;
    }

    .progress-bar {
        width: 100%;
    }

    /* Move the interactive panel below the lesson on mobile so the
       quiz and animations are always reachable. */
    .interactive-panel {
        grid-column: 1;
        order: 2;
        max-height: 70vh;
    }

    .content-area {
        order: 1;
    }
}

@media (max-width: 600px) {
    .lesson-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }

    .lesson-number {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .lesson-title {
        font-size: 1.5rem;
    }

    .final-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--ai-blue);
}

/* Selection */
::selection {
    background: var(--ai-purple);
    color: var(--text-inverse);
}

/* Focus Styles */
:focus {
    outline: 2px solid var(--ai-blue);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .course-header,
    .sidebar,
    .interactive-panel,
    .modal {
        display: none !important;
    }
    
    .main-content {
        display: block;
    }
    
    .lesson-container {
        max-height: none;
    }
}