/* ================================================
   Shared Lesson System - CSS
   EngiSuite Analytics Learning Platform
   ================================================ */

/* Lesson-specific CSS Variables */
:root {
    --lesson-primary: #3b82f6;
    --lesson-primary-dark: #2563eb;
    --lesson-secondary: #22c55e;
    --lesson-warning: #f59e0b;
    --lesson-danger: #ef4444;
    --lesson-info: #0ea5e9;
    --lesson-bg-primary: #f8fafc;
    --lesson-bg-secondary: #ffffff;
    --lesson-text-primary: #1e293b;
    --lesson-text-secondary: #64748b;
    --lesson-border: #e2e8f0;
    --lesson-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --lesson-radius: 0.75rem;
}

/* Dark theme variables */
[data-theme="dark"] {
    --lesson-bg-primary: #1a1a2e;
    --lesson-bg-secondary: #16213e;
    --lesson-text-primary: #eaeaea;
    --lesson-text-secondary: #94a3b8;
    --lesson-border: #334155;
}

/* Base Lesson Styles */
.lesson-content {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.8;
}

.lesson-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 1.5rem 0 1rem;
    color: var(--lesson-text-primary);
}

.lesson-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 1.25rem 0 0.75rem;
    color: var(--lesson-text-primary);
}

.lesson-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 1rem 0 0.5rem;
    color: var(--lesson-text-primary);
}

.lesson-content p {
    margin-bottom: 1rem;
    color: var(--lesson-text-secondary);
}

.lesson-content ul,
.lesson-content ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.lesson-content li {
    margin-bottom: 0.5rem;
    color: var(--lesson-text-secondary);
}

/* Formula Cards */
.formula-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 1rem;
    padding: 1.5rem;
    color: white;
    text-align: center;
    margin: 1rem 0;
}

.formula-card .formula {
    font-size: 1.5rem;
    font-weight: bold;
    font-family: 'Times New Roman', serif;
}

.formula-card .description {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.9;
}

.formula-card.accent-blue {
    background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
}

.formula-card.accent-green {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.formula-card.accent-orange {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
}

.formula-card.accent-red {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

/* Info, Warning, Success Boxes */
.info-box {
    background: #dbeafe;
    border-left: 4px solid var(--lesson-primary);
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
}

[data-theme="dark"] .info-box {
    background: rgba(59, 130, 246, 0.15);
}

.warning-box {
    background: #fef3c7;
    border-left: 4px solid var(--lesson-warning);
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
}

[data-theme="dark"] .warning-box {
    background: rgba(245, 158, 11, 0.15);
}

.success-box {
    background: #dcfce7;
    border-left: 4px solid var(--lesson-secondary);
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 0;
}

[data-theme="dark"] .success-box {
    background: rgba(34, 197, 94, 0.15);
}

.info-box,
.warning-box,
.success-box {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.info-box i,
.warning-box i,
.success-box i {
    margin-top: 0.25rem;
    flex-shrink: 0;
}

/* Math Formula Display */
.math-formula {
    overflow-x: auto;
    padding: 1rem 0;
    background: var(--lesson-bg-primary);
    border-radius: var(--lesson-radius);
    padding: 1rem;
    margin: 1rem 0;
}

[data-theme="dark"] .math-formula {
    background: var(--lesson-bg-secondary);
}

/* Step Indicators */
.step-indicator {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.step-dot {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-active {
    background: var(--lesson-primary);
    color: white;
}

.step-inactive {
    background: var(--lesson-border);
    color: var(--lesson-text-secondary);
}

.step-content {
    flex: 1;
}

.step-content .font-medium {
    color: var(--lesson-text-primary);
}

.step-content .text-sm {
    color: var(--lesson-text-secondary);
}

/* Quiz Styles */
.quiz-container {
    background: var(--lesson-bg-primary);
    border-radius: var(--lesson-radius);
    padding: 1.5rem;
}

.quiz-question {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--lesson-text-primary);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quiz-option {
    padding: 1rem;
    border: 2px solid var(--lesson-border);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.quiz-option:hover {
    border-color: var(--lesson-primary);
    background: rgba(59, 130, 246, 0.05);
}

.quiz-option.selected {
    border-color: var(--lesson-primary);
    background: rgba(59, 130, 246, 0.1);
}

.quiz-option.correct {
    border-color: var(--lesson-secondary);
    background: rgba(34, 197, 94, 0.1);
}

.quiz-option.incorrect {
    border-color: var(--lesson-danger);
    background: rgba(239, 68, 68, 0.1);
}

.quiz-option.correct::after {
    content: " ✓";
    color: var(--lesson-secondary);
}

.quiz-option.incorrect::after {
    content: " ✗";
    color: var(--lesson-danger);
}

.quiz-feedback {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 0.5rem;
    display: none;
}

.quiz-feedback.correct {
    display: block;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid var(--lesson-secondary);
    color: #166534;
}

.quiz-feedback.incorrect {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--lesson-danger);
    color: #991b1b;
}

/* Takeaway Card */
.takeaway-card {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    border-radius: var(--lesson-radius);
    padding: 1.5rem;
    color: white;
}

.takeaway-card ul {
    list-style: none;
    margin-left: 0;
}

.takeaway-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
}

.takeaway-card li:last-child {
    border-bottom: none;
}

.takeaway-card li::before {
    content: "✓";
    margin-right: 0.5rem;
    font-weight: bold;
}

/* Problem Card */
.problem-card {
    border: 1px solid var(--lesson-border);
    border-radius: var(--lesson-radius);
    padding: 1.5rem;
    background: var(--lesson-bg-secondary);
    margin-bottom: 1rem;
}

.problem-card h3 {
    margin-bottom: 0.5rem;
}

.difficulty-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
}

.difficulty-badge.easy {
    background: rgba(34, 197, 94, 0.1);
    color: #166534;
}

.difficulty-badge.medium {
    background: rgba(245, 158, 11, 0.1);
    color: #92400e;
}

.difficulty-badge.hard {
    background: rgba(239, 68, 68, 0.1);
    color: #991b1b;
}

.solution-content {
    background: var(--lesson-bg-primary);
    border-radius: var(--lesson-radius);
    padding: 1rem;
    margin-top: 1rem;
}

/* Navigation Buttons */
.nav-buttons {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--lesson-border);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--lesson-radius);
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.nav-btn.prev {
    background: var(--lesson-bg-primary);
    color: var(--lesson-text-primary);
    border: 1px solid var(--lesson-border);
}

.nav-btn.prev:hover {
    background: var(--lesson-border);
}

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

.nav-btn.next:hover {
    background: var(--lesson-primary-dark);
}

.nav-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Lesson Topic Highlight */
.lesson-topic {
    font-weight: 500;
    color: var(--lesson-primary);
    background: rgba(59, 130, 246, 0.1);
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
}

/* Circuit Diagram Styles */
.circuit-diagram {
    background: var(--lesson-bg-primary);
    border-radius: var(--lesson-radius);
    padding: 1rem;
    margin: 1rem 0;
    overflow-x: auto;
}

.circuit-canvas {
    width: 100%;
    min-height: 200px;
}

/* Electron Animation */
.electron {
    position: absolute;
    width: 8px;
    height: 8px;
    background: #fbbf24;
    border-radius: 50%;
    box-shadow: 0 0 6px #fbbf24;
    transition: none;
}

/* Responsive */
@media (max-width: 768px) {
    .lesson-header {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-buttons {
        flex-direction: column;
    }

    .nav-btn {
        justify-content: center;
    }
}